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968
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1 /* lex.l -*- C++ -*- |
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2 |
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1009
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3 Copyright (C) 1992, 1993, 1994, 1995 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with GNU CC; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 %s TEXT_FCN |
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24 %s MATRIX |
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25 |
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26 %{ |
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428
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27 #define SHORT_CIRCUIT_LOGICALS 1 |
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28 |
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240
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29 #ifdef HAVE_CONFIG_H |
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1220
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30 #include <config.h> |
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240
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31 #endif |
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32 |
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1341
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33 #include <cctype> |
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34 #include <cstring> |
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35 |
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973
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36 #include <strstream.h> |
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522
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37 |
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1
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38 #include "SLStack.h" |
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39 |
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1497
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40 // These would be alphabetical, but y.tab.h must be included before |
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41 // oct-gperf.h and y.tab.h must be included after token.h and the tree |
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42 // class declarations. We can't include y.tab.h in oct-gperf.h |
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43 // because it may not be protected to allow it to be included multiple |
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44 // times. |
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45 |
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1355
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46 #include "error.h" |
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1351
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47 #include "input.h" |
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1355
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48 #include "lex.h" |
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143
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49 #include "octave.h" |
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1355
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50 #include "parse.h" |
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1
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51 #include "symtab.h" |
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1355
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52 #include "token.h" |
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584
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53 #include "tree-base.h" |
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1355
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54 #include "tree-cmd.h" |
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55 #include "tree-const.h" |
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584
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56 #include "tree-expr.h" |
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576
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57 #include "tree-misc.h" |
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488
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58 #include "tree-plot.h" |
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1355
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59 #include "user-prefs.h" |
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60 #include "utils.h" |
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61 #include "variables.h" |
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1
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62 #include "y.tab.h" |
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1497
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63 #include "oct-gperf.h" |
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64 |
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1351
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65 // Stack to hold tokens so that we can delete them when the parser is |
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66 // reset and avoid growing forever just because we are stashing some |
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67 // information. This has to appear before lex.h is included, because |
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68 // one of the macros defined there uses token_stack. |
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69 static SLStack <token*> token_stack; |
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70 |
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1
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71 // Nonzero means we think we are looking at a set command. |
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72 static int doing_set = 0; |
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73 |
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74 // GAG. Stupid kludge so that [[1,2][3,4]] will work. |
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75 static do_comma_insert = 0; |
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76 |
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77 // Brace level count. |
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78 static int braceflag = 0; |
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79 |
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80 // Return transpose or start a string? |
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240
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81 int quote_is_transpose = 0; |
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1
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82 |
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440
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83 // Nonzero means we thing we are looking at the beginning of a |
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84 // function definition. |
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85 int beginning_of_function = 0; |
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86 |
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1
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87 // Nonzero means that we should convert spaces to a comma inside a |
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88 // matrix definition. |
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89 static int convert_spaces_to_comma = 1; |
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90 |
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91 // Another context hack, this time for the plot command's `using', |
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92 // `title', and `with' keywords. |
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93 static int cant_be_identifier = 0; |
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94 |
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985
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95 #define BRACE 1 |
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96 #define PAREN 2 |
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97 |
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1088
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98 // Did eat_whitespace() eat a space or tab, or a newline, or both? |
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99 #define ATE_SPACE_OR_TAB 1 |
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100 #define ATE_NEWLINE 2 |
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101 |
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1
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102 // Is the closest nesting level a square brace or a paren? |
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103 // |
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985
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104 // BRACE -> spaces are important (they can turn into commas) |
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105 // new lines are important (they can turn into semicolons) |
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1
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106 // |
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985
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107 // PAREN -> spaces and new lines are not important |
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108 |
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109 static SLStack <int> nesting_level; |
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1
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110 |
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146
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111 // Forward declarations for functions defined at the bottom of this |
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112 // file. |
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113 |
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1
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114 static void do_string_escapes (char *s); |
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115 static void fixup_column_count (char *s); |
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146
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116 static void do_comma_insert_check (void); |
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1
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117 static int is_plot_keyword (char *s); |
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118 static int is_keyword (char *s); |
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119 static char *plot_style_token (char *s); |
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120 static symbol_record *lookup_identifier (char *s); |
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121 static void grab_help_text (void); |
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122 static int match_any (char c, char *s); |
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123 static int next_token_is_bin_op (int spc_prev, char *yytext); |
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124 static int next_token_is_postfix_unary_op (int spc_prev, char *yytext); |
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125 static char *strip_trailing_whitespace (char *s); |
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972
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126 static void handle_number (char *yytext); |
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975
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127 static int handle_string (char delim, int text_style = 0); |
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1001
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128 static int handle_close_brace (int spc_gobbled); |
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129 static int handle_identifier (char *tok, int spc_gobbled); |
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1091
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130 static int have_continuation (int trailing_comments_ok = 1); |
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131 static int have_ellipsis_continuation (int trailing_comments_ok = 1); |
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1001
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132 static int eat_whitespace (void); |
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133 static int eat_continuation (void); |
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1
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134 |
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135 %} |
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136 |
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137 D [0-9] |
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138 S [ \t] |
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967
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139 NL [\n] |
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140 SNL [ \t\n] |
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1
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141 EL (\.\.\.) |
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967
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142 BS (\\) |
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143 CONT ({EL}|{BS}) |
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1
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144 Im [iIjJ] |
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967
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145 CCHAR [#%] |
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146 COMMENT ({CCHAR}.*{NL}) |
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147 SNLCMT ({SNL}|{COMMENT}) |
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148 NOTEQ ((~=)|(!=)|(<>)) |
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149 POW ((\*\*)|(\^)) |
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150 EPOW (\.{POW}) |
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151 NOT ((\~)|(\!)) |
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1
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152 IDENT ([_a-zA-Z][_a-zA-Z0-9]*) |
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153 EXPON ([DdEe][+-]?{D}+) |
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968
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154 NUMBER (({D}+\.?{D}*{EXPON}?)|(\.{D}+{EXPON}?)) |
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1
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155 %% |
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156 |
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968
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157 %{ |
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158 // Help and other text-style functions are a pain in the ass. This |
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159 // stuff needs to be simplified. May require some changes in the |
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160 // parser too. |
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161 %} |
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162 |
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967
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163 <TEXT_FCN>{NL} { |
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164 BEGIN 0; |
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165 current_input_column = 1; |
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166 quote_is_transpose = 0; |
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167 cant_be_identifier = 0; |
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168 convert_spaces_to_comma = 1; |
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169 return '\n'; |
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170 } |
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1
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171 |
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967
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172 <TEXT_FCN>[\;\,] { |
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173 if (doing_set && strcmp (yytext, ",") == 0) |
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174 { |
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1060
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175 TOK_PUSH_AND_RETURN (yytext, TEXT); |
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967
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176 } |
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177 else |
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178 { |
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179 BEGIN 0; |
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180 if (strcmp (yytext, ",") == 0) |
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181 TOK_RETURN (','); |
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182 else |
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183 TOK_RETURN (';'); |
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184 } |
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185 } |
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1
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186 |
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975
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187 <TEXT_FCN>[\"\'] { |
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188 current_input_column++; |
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189 return handle_string (yytext[0], 1); |
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190 } |
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191 |
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1
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192 <TEXT_FCN>[^ \t\n\;\,]*{S}* { |
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1288
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193 char *tok = strip_trailing_whitespace (yytext); |
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1060
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194 TOK_PUSH_AND_RETURN (tok, TEXT); |
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967
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195 } |
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1
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196 |
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968
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197 %{ |
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1
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198 // For this and the next two rules, we're looking at ']', and we |
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971
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199 // need to know if the next token is `=' or `=='. |
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1
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200 // |
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201 // It would have been so much easier if the delimiters were simply |
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202 // different for the expression on the left hand side of the equals |
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203 // operator. |
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971
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204 // |
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205 // It's also a pain in the ass to decide whether to insert a comma |
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206 // after seeing a ']' character... |
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968
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207 %} |
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208 |
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967
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209 <MATRIX>{SNL}*\]{S}* { |
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1001
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210 fixup_column_count (yytext); |
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211 int c = yytext[yyleng-1]; |
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212 int cont_is_spc = eat_continuation (); |
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213 int spc_gobbled = (cont_is_spc || c == ' ' || c == '\t'); |
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214 return handle_close_brace (spc_gobbled); |
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967
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215 } |
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1
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216 |
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968
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217 %{ |
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1088
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218 // Commas are element separators in matrix constants. If we don't |
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219 // check for continuations here we can end up inserting too many |
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220 // commas. |
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968
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221 %} |
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222 |
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967
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223 <MATRIX>{S}*\,{S}* { |
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1088
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224 current_input_column += yyleng; |
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225 int tmp = eat_continuation (); |
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226 quote_is_transpose = 0; |
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227 cant_be_identifier = 0; |
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228 convert_spaces_to_comma = 1; |
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229 if (user_pref.whitespace_in_literal_matrix != 2 |
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230 && (tmp & ATE_NEWLINE) == ATE_NEWLINE) |
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231 unput (';'); |
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232 return (','); |
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967
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233 } |
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1
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234 |
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968
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235 %{ |
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236 // In some cases, spaces in matrix constants can turn into commas. |
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237 // If commas are required, spaces are not important in matrix |
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1088
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238 // constants so we just eat them. If we don't check for continuations |
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239 // here we can end up inserting too many commas. |
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968
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240 %} |
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430
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241 |
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968
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242 <MATRIX>{S}+ { |
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1088
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243 current_input_column += yyleng; |
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985
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244 if (user_pref.whitespace_in_literal_matrix != 2) |
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967
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245 { |
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1088
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246 int tmp = eat_continuation (); |
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967
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247 int bin_op = next_token_is_bin_op (1, yytext); |
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248 int postfix_un_op = next_token_is_postfix_unary_op (1, yytext); |
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249 |
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985
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250 if (! (postfix_un_op || bin_op || nesting_level.empty ()) |
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251 && nesting_level.top () == BRACE |
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967
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252 && convert_spaces_to_comma) |
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1088
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253 { |
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254 quote_is_transpose = 0; |
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255 cant_be_identifier = 0; |
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256 convert_spaces_to_comma = 1; |
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257 if ((tmp & ATE_NEWLINE) == ATE_NEWLINE) |
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258 unput (';'); |
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259 return (','); |
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260 } |
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967
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261 } |
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262 } |
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430
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263 |
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968
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264 %{ |
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1088
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265 // Semicolons are handled as row seprators in matrix constants. If we |
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266 // don't eat whitespace here we can end up inserting too many |
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267 // semicolons. |
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968
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268 %} |
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269 |
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985
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270 <MATRIX>{SNLCMT}*;{SNLCMT}* { |
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967
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271 fixup_column_count (yytext); |
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1001
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272 eat_whitespace (); |
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967
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273 quote_is_transpose = 0; |
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274 cant_be_identifier = 0; |
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275 convert_spaces_to_comma = 1; |
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276 return ';'; |
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277 } |
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278 |
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968
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279 %{ |
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1088
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280 // In some cases, new lines can also become row separators. If we |
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281 // don't eat whitespace here we can end up inserting too many |
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282 // semicolons. |
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985
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283 %} |
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284 |
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285 <MATRIX>{SNLCMT}*\n{SNLCMT}* { |
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1082
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286 fixup_column_count (yytext); |
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1088
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287 eat_whitespace (); |
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985
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288 if (user_pref.whitespace_in_literal_matrix != 2) |
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289 { |
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290 quote_is_transpose = 0; |
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291 cant_be_identifier = 0; |
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292 convert_spaces_to_comma = 1; |
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293 |
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294 if (nesting_level.empty ()) |
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295 return LEXICAL_ERROR; |
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296 |
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297 if (nesting_level.top () == BRACE) |
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298 return ';'; |
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299 } |
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300 } |
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301 |
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302 %{ |
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968
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303 // Open and close brace are handled differently if we are in the range |
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304 // part of a plot command. |
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975
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305 // |
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968
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306 %} |
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1
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307 |
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967
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308 \[{S}* { |
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1082
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309 nesting_level.push (BRACE); |
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975
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310 |
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1082
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311 current_input_column += yyleng; |
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312 quote_is_transpose = 0; |
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313 cant_be_identifier = 0; |
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314 convert_spaces_to_comma = 1; |
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975
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315 |
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316 promptflag--; |
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317 eat_whitespace (); |
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318 |
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967
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319 if (plotting && ! past_plot_range) |
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320 { |
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321 in_plot_range = 1; |
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1082
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322 return OPEN_BRACE; |
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967
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323 } |
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324 else |
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325 { |
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326 mlnm.push (1); |
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327 braceflag++; |
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975
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328 BEGIN MATRIX; |
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1082
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329 return '['; |
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967
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330 } |
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331 } |
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1
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332 |
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968
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333 \] { |
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985
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334 if (! nesting_level.empty ()) |
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335 nesting_level.pop (); |
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968
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336 |
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337 if (plotting && ! past_plot_range) |
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338 { |
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339 in_plot_range = 0; |
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340 TOK_RETURN (CLOSE_BRACE); |
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341 } |
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342 else |
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343 TOK_RETURN (']'); |
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344 } |
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345 |
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346 %{ |
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347 // Imaginary numbers. |
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348 %} |
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349 |
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350 {NUMBER}{Im} { |
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972
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351 handle_number (yytext); |
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968
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352 return IMAG_NUM; |
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353 } |
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354 |
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355 %{ |
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356 // Real numbers. Don't grab the `.' part of a dot operator as part of |
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357 // the constant. |
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358 %} |
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359 |
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360 {D}+/\.[\*/\\^'] | |
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361 {NUMBER} { |
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972
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362 handle_number (yytext); |
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968
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363 return NUM; |
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364 } |
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365 |
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366 %{ |
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367 // Eat whitespace. Whitespace inside matrix constants is handled by |
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368 // the <MATRIX> start state code above. |
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369 %} |
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370 |
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967
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371 {S}* { |
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372 current_input_column += yyleng; |
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373 } |
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374 |
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968
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375 %{ |
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376 // Continuation lines. Allow comments after continuations. |
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377 %} |
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378 |
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967
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379 {CONT}{S}*{NL} | |
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380 {CONT}{S}*{COMMENT} { |
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381 promptflag--; |
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382 current_input_column = 1; |
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383 } |
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1
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384 |
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968
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385 %{ |
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386 // An ellipsis not at the end of a line is not a continuation, but |
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387 // does have another meaning. |
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388 %} |
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389 |
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967
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390 {EL} { |
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391 return ELLIPSIS; |
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392 } |
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1
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393 |
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968
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394 %{ |
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395 // End of file. |
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396 %} |
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397 |
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967
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398 <<EOF>> { |
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399 TOK_RETURN (END_OF_INPUT); |
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400 } |
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1
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401 |
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968
|
402 %{ |
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970
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403 // Identifiers. Truncate the token at the first space or tab but |
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404 // don't write directly on yytext. |
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968
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405 %} |
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406 |
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967
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407 {IDENT}{S}* { |
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1288
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408 char *tok = strip_trailing_whitespace (yytext); |
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1001
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409 int c = yytext[yyleng-1]; |
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410 int cont_is_spc = eat_continuation (); |
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411 int spc_gobbled = (cont_is_spc || c == ' ' || c == '\t'); |
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412 return handle_identifier (tok, spc_gobbled); |
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967
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413 } |
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1
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414 |
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968
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415 %{ |
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416 // A new line character. New line characters inside matrix constants |
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985
|
417 // are handled by the <MATRIX> start state code above. If closest |
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418 // nesting is inside parentheses, don't return a row separator. |
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968
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419 %} |
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420 |
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967
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421 {NL} { |
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422 quote_is_transpose = 0; |
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423 cant_be_identifier = 0; |
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424 current_input_column = 1; |
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425 convert_spaces_to_comma = 1; |
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985
|
426 |
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427 if (nesting_level.empty ()) |
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428 return '\n'; |
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429 |
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430 if (nesting_level.top () == BRACE) |
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431 return LEXICAL_ERROR; |
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967
|
432 } |
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1
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433 |
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968
|
434 %{ |
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435 // Single quote can either be the beginning of a string or a transpose |
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|
436 // operator. |
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437 %} |
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438 |
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967
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439 "'" { |
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440 current_input_column++; |
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|
441 convert_spaces_to_comma = 1; |
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1
|
442 |
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967
|
443 if (quote_is_transpose) |
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|
444 { |
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445 do_comma_insert_check (); |
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|
446 return QUOTE; |
|
|
447 } |
|
|
448 else |
|
973
|
449 return handle_string ('\''); |
|
967
|
450 } |
|
1
|
451 |
|
968
|
452 %{ |
|
971
|
453 // Double quotes always begin strings. |
|
|
454 %} |
|
|
455 |
|
973
|
456 \" { |
|
|
457 current_input_column++; |
|
|
458 return handle_string ('"'); |
|
|
459 } |
|
971
|
460 |
|
|
461 %{ |
|
|
462 // The colon operator is handled differently if we are in the range |
|
|
463 // part of a plot command. |
|
968
|
464 %} |
|
|
465 |
|
967
|
466 ":" { |
|
|
467 if (plotting && (in_plot_range || in_plot_using)) |
|
|
468 BIN_OP_RETURN (COLON, 1); |
|
|
469 else |
|
|
470 BIN_OP_RETURN (':', 0); |
|
|
471 } |
|
1
|
472 |
|
968
|
473 %{ |
|
985
|
474 // Gobble comments. If closest nesting is inside parentheses, don't |
|
|
475 // return a new line. |
|
|
476 %} |
|
968
|
477 |
|
967
|
478 {CCHAR} { |
|
1019
|
479 if (! help_buf && beginning_of_function && nesting_level.empty ()) |
|
967
|
480 { |
|
|
481 grab_help_text (); |
|
|
482 beginning_of_function = 0; |
|
|
483 } |
|
|
484 else |
|
|
485 { |
|
|
486 int c; |
|
|
487 while ((c = yyinput ()) != EOF && c != '\n') |
|
|
488 ; // Eat comment. |
|
|
489 } |
|
440
|
490 |
|
967
|
491 quote_is_transpose = 0; |
|
|
492 cant_be_identifier = 0; |
|
|
493 current_input_column = 1; |
|
|
494 convert_spaces_to_comma = 1; |
|
985
|
495 |
|
|
496 if (nesting_level.empty () || nesting_level.top () == BRACE) |
|
|
497 return '\n'; |
|
967
|
498 } |
|
440
|
499 |
|
968
|
500 %{ |
|
|
501 // Other operators. |
|
|
502 %} |
|
|
503 |
|
1276
|
504 ".+" { BIN_OP_RETURN (EPLUS, 0); } |
|
|
505 ".-" { BIN_OP_RETURN (EMINUS, 0); } |
|
143
|
506 ".*" { BIN_OP_RETURN (EMUL, 0); } |
|
|
507 "./" { BIN_OP_RETURN (EDIV, 0); } |
|
|
508 ".\\" { BIN_OP_RETURN (ELEFTDIV, 0); } |
|
967
|
509 {EPOW} { BIN_OP_RETURN (EPOW, 0); } |
|
146
|
510 ".'" { do_comma_insert_check (); BIN_OP_RETURN (TRANSPOSE, 1); } |
|
|
511 "++" { do_comma_insert_check (); BIN_OP_RETURN (PLUS_PLUS, 1); } |
|
|
512 "--" { do_comma_insert_check (); BIN_OP_RETURN (MINUS_MINUS, 1); } |
|
143
|
513 "<=" { BIN_OP_RETURN (EXPR_LE, 0); } |
|
|
514 "==" { BIN_OP_RETURN (EXPR_EQ, 0); } |
|
967
|
515 {NOTEQ} { BIN_OP_RETURN (EXPR_NE, 0); } |
|
143
|
516 ">=" { BIN_OP_RETURN (EXPR_GE, 0); } |
|
|
517 "|" { BIN_OP_RETURN (EXPR_OR, 0); } |
|
|
518 "&" { BIN_OP_RETURN (EXPR_AND, 0); } |
|
|
519 "<" { BIN_OP_RETURN (EXPR_LT, 0); } |
|
|
520 ">" { BIN_OP_RETURN (EXPR_GT, 0); } |
|
|
521 "*" { BIN_OP_RETURN ('*', 0); } |
|
|
522 "/" { BIN_OP_RETURN ('/', 0); } |
|
|
523 "\\" { BIN_OP_RETURN (LEFTDIV, 0); } |
|
|
524 ";" { BIN_OP_RETURN (';', 1); } |
|
|
525 "," { BIN_OP_RETURN (',', 1); } |
|
967
|
526 {POW} { BIN_OP_RETURN (POW, 0); } |
|
143
|
527 "=" { BIN_OP_RETURN ('=', 1); } |
|
967
|
528 |
|
|
529 "||" { |
|
|
530 #ifdef SHORT_CIRCUIT_LOGICALS |
|
|
531 BIN_OP_RETURN (EXPR_OR_OR, 0); |
|
|
532 #else |
|
|
533 BIN_OP_RETURN (EXPR_OR, 0); |
|
|
534 #endif |
|
|
535 } |
|
|
536 |
|
|
537 "&&" { |
|
|
538 #ifdef SHORT_CIRCUIT_LOGICALS |
|
|
539 BIN_OP_RETURN (EXPR_AND_AND, 0); |
|
|
540 #else |
|
|
541 BIN_OP_RETURN (EXPR_AND, 0); |
|
|
542 #endif |
|
|
543 } |
|
|
544 |
|
|
545 {NOT} { |
|
|
546 if (plotting && ! in_plot_range) |
|
|
547 past_plot_range = 1; |
|
|
548 BIN_OP_RETURN (EXPR_NOT, 0); |
|
|
549 } |
|
1
|
550 |
|
1276
|
551 "+" { |
|
967
|
552 if (plotting && ! in_plot_range) |
|
|
553 past_plot_range = 1; |
|
|
554 BIN_OP_RETURN ('+', 0); |
|
|
555 } |
|
|
556 |
|
1276
|
557 "-" { |
|
967
|
558 if (plotting && ! in_plot_range) |
|
|
559 past_plot_range = 1; |
|
|
560 BIN_OP_RETURN ('-', 0); |
|
|
561 } |
|
|
562 |
|
|
563 "(" { |
|
|
564 if (plotting && ! in_plot_range) |
|
|
565 past_plot_range = 1; |
|
985
|
566 nesting_level.push (PAREN); |
|
|
567 promptflag--; |
|
967
|
568 TOK_RETURN ('('); |
|
|
569 } |
|
|
570 |
|
|
571 ")" { |
|
985
|
572 if (! nesting_level.empty ()) |
|
1001
|
573 nesting_level.pop (); |
|
|
574 |
|
967
|
575 current_input_column++; |
|
|
576 cant_be_identifier = 1; |
|
|
577 quote_is_transpose = 1; |
|
985
|
578 convert_spaces_to_comma = (! nesting_level.empty () |
|
|
579 && nesting_level.top () == BRACE); |
|
1001
|
580 do_comma_insert_check (); |
|
967
|
581 return ')'; |
|
|
582 } |
|
|
583 |
|
968
|
584 %{ |
|
1
|
585 // We return everything else as single character tokens, which should |
|
|
586 // eventually result in a parse error. |
|
968
|
587 %} |
|
1
|
588 |
|
968
|
589 . { TOK_RETURN (yytext[0]); } |
|
1
|
590 |
|
|
591 %% |
|
|
592 |
|
767
|
593 // GAG. |
|
|
594 // |
|
|
595 // If we're reading a matrix and the next character is '[', make sure |
|
|
596 // that we insert a comma ahead of it. |
|
|
597 |
|
146
|
598 void |
|
1
|
599 do_comma_insert_check (void) |
|
|
600 { |
|
1001
|
601 int spc_gobbled = eat_continuation (); |
|
1
|
602 int c = yyinput (); |
|
146
|
603 yyunput (c, yytext); |
|
1001
|
604 if (spc_gobbled) |
|
|
605 yyunput (' ', yytext); |
|
1
|
606 do_comma_insert = (braceflag && c == '['); |
|
|
607 } |
|
|
608 |
|
767
|
609 // Fix things up for errors or interrupts. The parser is never called |
|
|
610 // recursively, so it is always safe to reinitialize its state before |
|
|
611 // doing any parsing. |
|
|
612 |
|
1
|
613 void |
|
|
614 reset_parser (void) |
|
|
615 { |
|
287
|
616 // Start off on the right foot. |
|
1
|
617 BEGIN 0; |
|
166
|
618 error_state = 0; |
|
287
|
619 |
|
|
620 // We do want a prompt by default. |
|
1
|
621 promptflag = 1; |
|
287
|
622 |
|
|
623 // Not initially screwed by `function [...] = f (...)' syntax. |
|
1
|
624 maybe_screwed = 0; |
|
|
625 maybe_screwed_again = 0; |
|
287
|
626 |
|
|
627 // Not initially inside a loop or if statement. |
|
1
|
628 looping = 0; |
|
|
629 iffing = 0; |
|
287
|
630 |
|
|
631 // Quote marks strings intially. |
|
|
632 quote_is_transpose = 0; |
|
|
633 |
|
|
634 // Next token can be identifier. |
|
|
635 cant_be_identifier = 0; |
|
|
636 |
|
|
637 // No need to do comma insert or convert spaces to comma at beginning |
|
|
638 // of input. |
|
|
639 do_comma_insert = 0; |
|
|
640 convert_spaces_to_comma = 1; |
|
|
641 |
|
|
642 // Not initially defining a function. |
|
|
643 beginning_of_function = 0; |
|
|
644 defining_func = 0; |
|
|
645 |
|
|
646 // Not initially doing any plotting or setting of plot attributes. |
|
|
647 plotting = 0; |
|
|
648 in_plot_range = 0; |
|
|
649 past_plot_range = 0; |
|
|
650 in_plot_using = 0; |
|
|
651 in_plot_style = 0; |
|
|
652 doing_set = 0; |
|
|
653 |
|
747
|
654 // Not initially looking at indirect references. |
|
|
655 looking_at_indirect_ref = 0; |
|
|
656 |
|
287
|
657 // Error may have occurred inside some parentheses or braces. |
|
985
|
658 nesting_level.clear (); |
|
287
|
659 |
|
|
660 // Not initially defining a matrix list. |
|
|
661 braceflag = 0; |
|
1
|
662 ml.clear (); |
|
|
663 mlnm.clear (); |
|
287
|
664 |
|
|
665 // Clear out the stack of token info used to track line and column |
|
|
666 // numbers. |
|
143
|
667 while (! token_stack.empty ()) |
|
|
668 delete token_stack.pop (); |
|
287
|
669 |
|
|
670 // Can be reset by defining a function. |
|
985
|
671 if (! (reading_script_file || reading_fcn_file)) |
|
|
672 { |
|
|
673 current_input_column = 1; |
|
|
674 input_line_number = current_command_number - 1; |
|
|
675 } |
|
287
|
676 |
|
|
677 // Only ask for input from stdin if we are expecting interactive |
|
|
678 // input. |
|
338
|
679 if (interactive && ! (reading_fcn_file || get_input_from_eval_string)) |
|
287
|
680 yyrestart (stdin); |
|
991
|
681 |
|
|
682 // Delete the buffer for help text. |
|
|
683 delete [] help_buf; |
|
|
684 help_buf = 0; |
|
1
|
685 } |
|
|
686 |
|
767
|
687 // Replace backslash escapes in a string with the real values. |
|
|
688 |
|
1
|
689 static void |
|
|
690 do_string_escapes (char *s) |
|
|
691 { |
|
|
692 char *p1 = s; |
|
|
693 char *p2 = s; |
|
|
694 while (*p2 != '\0') |
|
|
695 { |
|
|
696 if (*p2 == '\\' && *(p2+1) != '\0') |
|
|
697 { |
|
|
698 switch (*++p2) |
|
|
699 { |
|
|
700 case 'a': |
|
|
701 *p1 = '\a'; |
|
|
702 break; |
|
777
|
703 |
|
1
|
704 case 'b': // backspace |
|
|
705 *p1 = '\b'; |
|
|
706 break; |
|
777
|
707 |
|
1
|
708 case 'f': // formfeed |
|
|
709 *p1 = '\f'; |
|
|
710 break; |
|
777
|
711 |
|
1
|
712 case 'n': // newline |
|
|
713 *p1 = '\n'; |
|
|
714 break; |
|
777
|
715 |
|
1
|
716 case 'r': // carriage return |
|
|
717 *p1 = '\r'; |
|
|
718 break; |
|
777
|
719 |
|
1
|
720 case 't': // horizontal tab |
|
|
721 *p1 = '\t'; |
|
|
722 break; |
|
777
|
723 |
|
1
|
724 case 'v': // vertical tab |
|
|
725 *p1 = '\v'; |
|
|
726 break; |
|
777
|
727 |
|
1
|
728 case '\\': // backslash |
|
|
729 *p1 = '\\'; |
|
|
730 break; |
|
777
|
731 |
|
1
|
732 case '\'': // quote |
|
|
733 *p1 = '\''; |
|
|
734 break; |
|
777
|
735 |
|
1
|
736 case '"': // double quote |
|
|
737 *p1 = '"'; |
|
|
738 break; |
|
777
|
739 |
|
1
|
740 default: |
|
777
|
741 warning ("unrecognized escape sequence `\\%c' --\ |
|
|
742 converting to `%c'", *p2, *p2); |
|
1
|
743 *p1 = *p2; |
|
|
744 break; |
|
|
745 } |
|
|
746 } |
|
|
747 else |
|
|
748 { |
|
|
749 *p1 = *p2; |
|
|
750 } |
|
|
751 |
|
|
752 p1++; |
|
|
753 p2++; |
|
|
754 } |
|
|
755 |
|
|
756 *p1 = '\0'; |
|
|
757 } |
|
|
758 |
|
767
|
759 // If we read some newlines, we need figure out what column we're |
|
|
760 // really looking at. |
|
|
761 |
|
1
|
762 static void |
|
|
763 fixup_column_count (char *s) |
|
|
764 { |
|
|
765 char c; |
|
|
766 while ((c = *s++) != '\0') |
|
|
767 { |
|
|
768 if (c == '\n') |
|
143
|
769 current_input_column = 1; |
|
1
|
770 else |
|
|
771 current_input_column++; |
|
|
772 } |
|
|
773 } |
|
|
774 |
|
767
|
775 // Include these so that we don't have to link to libfl.a. |
|
246
|
776 |
|
1
|
777 #ifdef yywrap |
|
|
778 #undef yywrap |
|
|
779 #endif |
|
246
|
780 static int |
|
1
|
781 yywrap (void) |
|
|
782 { |
|
287
|
783 return 1; |
|
1
|
784 } |
|
|
785 |
|
767
|
786 // These are not needed with flex-2.4.6, but may be needed with |
|
|
787 // earlier 2.4.x versions. |
|
|
788 |
|
287
|
789 #if 0 |
|
246
|
790 static void * |
|
|
791 yy_flex_alloc (int size) |
|
|
792 { |
|
|
793 return (void *) malloc ((unsigned) size); |
|
|
794 } |
|
|
795 |
|
|
796 static void * |
|
|
797 yy_flex_realloc (void *ptr, int size) |
|
|
798 { |
|
|
799 return (void *) realloc (ptr, (unsigned) size); |
|
|
800 } |
|
|
801 |
|
|
802 static void |
|
|
803 yy_flex_free (void *ptr) |
|
|
804 { |
|
|
805 free (ptr); |
|
|
806 } |
|
287
|
807 #endif |
|
246
|
808 |
|
767
|
809 // Tell us all what the current buffer is. |
|
|
810 |
|
1
|
811 YY_BUFFER_STATE |
|
|
812 current_buffer (void) |
|
|
813 { |
|
|
814 return YY_CURRENT_BUFFER; |
|
|
815 } |
|
|
816 |
|
767
|
817 // Create a new buffer. |
|
|
818 |
|
1
|
819 YY_BUFFER_STATE |
|
|
820 create_buffer (FILE *f) |
|
|
821 { |
|
|
822 return yy_create_buffer (f, YY_BUF_SIZE); |
|
|
823 } |
|
|
824 |
|
767
|
825 // Start reading a new buffer. |
|
|
826 |
|
1
|
827 void |
|
|
828 switch_to_buffer (YY_BUFFER_STATE buf) |
|
|
829 { |
|
|
830 yy_switch_to_buffer (buf); |
|
|
831 } |
|
|
832 |
|
767
|
833 // Delete a buffer. |
|
|
834 |
|
1
|
835 void |
|
|
836 delete_buffer (YY_BUFFER_STATE buf) |
|
|
837 { |
|
|
838 yy_delete_buffer (buf); |
|
|
839 } |
|
|
840 |
|
767
|
841 // Restore a buffer (for unwind-prot). |
|
|
842 |
|
1
|
843 void |
|
|
844 restore_input_buffer (void *buf) |
|
|
845 { |
|
|
846 switch_to_buffer ((YY_BUFFER_STATE) buf); |
|
|
847 } |
|
|
848 |
|
767
|
849 // Delete a buffer (for unwind-prot). |
|
|
850 |
|
1
|
851 void |
|
|
852 delete_input_buffer (void *buf) |
|
|
853 { |
|
|
854 delete_buffer ((YY_BUFFER_STATE) buf); |
|
|
855 } |
|
|
856 |
|
767
|
857 // Check to see if a character string matches any of the possible line |
|
|
858 // styles for plots. |
|
|
859 |
|
1
|
860 static char * |
|
|
861 plot_style_token (char *s) |
|
|
862 { |
|
146
|
863 static char *plot_styles[] = |
|
|
864 { |
|
925
|
865 "boxes", |
|
924
|
866 "boxerrorbars", |
|
146
|
867 "dots", |
|
|
868 "errorbars", |
|
|
869 "impulses", |
|
|
870 "lines", |
|
|
871 "linespoints", |
|
|
872 "points", |
|
926
|
873 "steps", |
|
522
|
874 0, |
|
146
|
875 }; |
|
|
876 |
|
1
|
877 char **tmp = plot_styles; |
|
522
|
878 while (*tmp) |
|
1
|
879 { |
|
|
880 if (almost_match (*tmp, s)) |
|
|
881 return *tmp; |
|
|
882 |
|
|
883 tmp++; |
|
|
884 } |
|
|
885 |
|
522
|
886 return 0; |
|
1
|
887 } |
|
|
888 |
|
767
|
889 // Check to see if a character string matches any one of the plot |
|
941
|
890 // option keywords. Don't match abbreviations for clear, since that's |
|
|
891 // not a gnuplot keyword (users will probably only expect to be able |
|
|
892 // to abbreviate actual gnuplot keywords). |
|
767
|
893 |
|
1
|
894 static int |
|
|
895 is_plot_keyword (char *s) |
|
|
896 { |
|
|
897 if (almost_match ("title", s)) |
|
146
|
898 { |
|
|
899 return TITLE; |
|
|
900 } |
|
1
|
901 else if (almost_match ("using", s)) |
|
146
|
902 { |
|
|
903 in_plot_using = 1; |
|
|
904 return USING; |
|
|
905 } |
|
1
|
906 else if (almost_match ("with", s)) |
|
146
|
907 { |
|
|
908 in_plot_style = 1; |
|
|
909 return WITH; |
|
|
910 } |
|
941
|
911 else if (strcmp ("clear", s) == 0) |
|
883
|
912 { |
|
|
913 return CLEAR; |
|
|
914 } |
|
1
|
915 else |
|
146
|
916 { |
|
|
917 return 0; |
|
|
918 } |
|
1
|
919 } |
|
|
920 |
|
767
|
921 // Handle keywords. Could probably be more efficient... |
|
|
922 |
|
1
|
923 static int |
|
|
924 is_keyword (char *s) |
|
|
925 { |
|
|
926 if (plotting && in_plot_style) |
|
|
927 { |
|
|
928 char *sty = plot_style_token (s); |
|
522
|
929 if (sty) |
|
1
|
930 { |
|
|
931 in_plot_style = 0; |
|
143
|
932 yylval.tok_val = new token (sty); |
|
|
933 token_stack.push (yylval.tok_val); |
|
1
|
934 return STYLE; |
|
|
935 } |
|
|
936 } |
|
|
937 |
|
143
|
938 int l = input_line_number; |
|
|
939 int c = current_input_column; |
|
|
940 |
|
1497
|
941 int len = strlen (s); |
|
922
|
942 |
|
1497
|
943 const octave_kw *kw = octave_kw_lookup (s, len); |
|
191
|
944 |
|
1497
|
945 if (kw) |
|
143
|
946 { |
|
1497
|
947 yylval.tok_val = 0; |
|
|
948 |
|
|
949 switch (kw->kw_id) |
|
|
950 { |
|
|
951 case all_va_args_kw: |
|
|
952 case break_kw: |
|
|
953 case catch_kw: |
|
|
954 case continue_kw: |
|
|
955 case else_kw: |
|
|
956 case elseif_kw: |
|
|
957 case global_kw: |
|
|
958 case return_kw: |
|
|
959 case unwind_protect_cleanup_kw: |
|
|
960 break; |
|
|
961 |
|
|
962 case end_kw: |
|
|
963 yylval.tok_val = new token (token::simple_end, l, c); |
|
|
964 break; |
|
|
965 |
|
|
966 case end_try_catch_kw: |
|
|
967 yylval.tok_val = new token (token::try_catch_end, l, c); |
|
|
968 break; |
|
|
969 |
|
|
970 case end_unwind_protect_kw: |
|
|
971 yylval.tok_val = new token (token::unwind_protect_end, l, c); |
|
|
972 break; |
|
|
973 |
|
|
974 case endfor_kw: |
|
|
975 yylval.tok_val = new token (token::for_end, l, c); |
|
|
976 break; |
|
|
977 |
|
|
978 case endfunction_kw: |
|
|
979 yylval.tok_val = new token (token::function_end, l, c); |
|
|
980 break; |
|
|
981 |
|
|
982 case endif_kw: |
|
|
983 yylval.tok_val = new token (token::if_end, l, c); |
|
|
984 break; |
|
|
985 |
|
|
986 case endwhile_kw: |
|
|
987 yylval.tok_val = new token (token::while_end, l, c); |
|
|
988 break; |
|
|
989 |
|
|
990 case for_kw: |
|
|
991 case while_kw: |
|
|
992 promptflag--; |
|
|
993 looping++; |
|
|
994 break; |
|
|
995 |
|
|
996 case if_kw: |
|
|
997 iffing++; |
|
|
998 promptflag--; |
|
|
999 break; |
|
|
1000 |
|
|
1001 case try_kw: |
|
|
1002 case unwind_protect_kw: |
|
|
1003 promptflag--; |
|
|
1004 break; |
|
|
1005 |
|
|
1006 case gplot_kw: |
|
|
1007 plotting = 1; |
|
|
1008 yylval.tok_val = new token (token::two_dee, l, c); |
|
|
1009 break; |
|
|
1010 |
|
|
1011 case gsplot_kw: |
|
|
1012 plotting = 1; |
|
|
1013 yylval.tok_val = new token (token::three_dee, l, c); |
|
|
1014 break; |
|
|
1015 |
|
|
1016 case replot_kw: |
|
|
1017 plotting = 1; |
|
|
1018 yylval.tok_val = new token (token::replot, l, c); |
|
|
1019 break; |
|
|
1020 |
|
|
1021 case function_kw: |
|
|
1022 if (defining_func) |
|
|
1023 { |
|
|
1024 error ("function keyword invalid within a function body"); |
|
|
1025 |
|
|
1026 if ((reading_fcn_file || reading_script_file) |
|
|
1027 && curr_fcn_file_name) |
|
|
1028 error ("defining new function near line %d of file `%s.m'", |
|
|
1029 input_line_number, curr_fcn_file_name); |
|
|
1030 else |
|
|
1031 error ("defining new function near line %d", input_line_number); |
|
|
1032 |
|
|
1033 return LEXICAL_ERROR; |
|
|
1034 } |
|
|
1035 else |
|
|
1036 { |
|
|
1037 tmp_local_sym_tab = new symbol_table (); |
|
|
1038 curr_sym_tab = tmp_local_sym_tab; |
|
|
1039 defining_func = 1; |
|
|
1040 promptflag--; |
|
|
1041 beginning_of_function = 1; |
|
|
1042 if (! (reading_fcn_file || reading_script_file)) |
|
|
1043 input_line_number = 1; |
|
|
1044 } |
|
|
1045 break; |
|
|
1046 |
|
|
1047 default: |
|
|
1048 panic_impossible (); |
|
|
1049 } |
|
|
1050 |
|
|
1051 if (! yylval.tok_val) |
|
|
1052 yylval.tok_val = new token (l, c); |
|
|
1053 |
|
476
|
1054 token_stack.push (yylval.tok_val); |
|
1497
|
1055 |
|
|
1056 return kw->tok; |
|
143
|
1057 } |
|
1
|
1058 |
|
|
1059 return 0; |
|
|
1060 } |
|
|
1061 |
|
767
|
1062 // Try to find an identifier. All binding to global or builtin |
|
|
1063 // variables occurs when expressions are evaluated. |
|
|
1064 |
|
1
|
1065 static symbol_record * |
|
|
1066 lookup_identifier (char *name) |
|
|
1067 { |
|
|
1068 return curr_sym_tab->lookup (name, 1, 0); |
|
|
1069 } |
|
|
1070 |
|
1019
|
1071 // Grab the help text from an function file. Always overwrites the |
|
|
1072 // current contents of help_buf. |
|
767
|
1073 |
|
1
|
1074 static void |
|
|
1075 grab_help_text (void) |
|
|
1076 { |
|
1019
|
1077 delete [] help_buf; |
|
|
1078 help_buf = 0; |
|
|
1079 |
|
|
1080 ostrstream buf; |
|
|
1081 |
|
|
1082 int in_comment = 1; |
|
|
1083 int c = 0; |
|
1
|
1084 |
|
1019
|
1085 while ((c = yyinput ()) != EOF) |
|
|
1086 { |
|
|
1087 if (in_comment) |
|
1
|
1088 { |
|
1019
|
1089 buf << (char) c; |
|
|
1090 if (c == '\n') |
|
|
1091 in_comment = 0; |
|
|
1092 } |
|
|
1093 else |
|
|
1094 { |
|
|
1095 switch (c) |
|
991
|
1096 { |
|
1019
|
1097 case '%': |
|
|
1098 case '#': |
|
|
1099 in_comment = 1; |
|
|
1100 break; |
|
777
|
1101 |
|
1019
|
1102 case ' ': |
|
|
1103 case '\t': |
|
|
1104 break; |
|
777
|
1105 |
|
1019
|
1106 default: |
|
|
1107 goto done; |
|
1
|
1108 } |
|
|
1109 } |
|
1019
|
1110 } |
|
991
|
1111 |
|
1019
|
1112 done: |
|
991
|
1113 |
|
1019
|
1114 if (c) |
|
|
1115 yyunput (c, yytext); |
|
991
|
1116 |
|
1019
|
1117 buf << ends; |
|
|
1118 |
|
|
1119 help_buf = buf.str (); |
|
991
|
1120 |
|
1019
|
1121 if (! help_buf || ! *help_buf) |
|
|
1122 { |
|
|
1123 delete [] help_buf; |
|
|
1124 help_buf = 0; |
|
1
|
1125 } |
|
|
1126 } |
|
|
1127 |
|
767
|
1128 // Return 1 if the given character matches any character in the given |
|
|
1129 // string. |
|
|
1130 |
|
1
|
1131 static int |
|
|
1132 match_any (char c, char *s) |
|
|
1133 { |
|
|
1134 char tmp; |
|
|
1135 while ((tmp = *s++) != '\0') |
|
|
1136 { |
|
|
1137 if (c == tmp) |
|
|
1138 return 1; |
|
|
1139 } |
|
|
1140 return 0; |
|
|
1141 } |
|
|
1142 |
|
767
|
1143 // Given information about the spacing surrounding an operator, |
|
|
1144 // return 1 if it looks like it should be treated as a binary |
|
|
1145 // operator. For example, |
|
|
1146 // |
|
|
1147 // [ 1 + 2 ] or [ 1+ 2] or [ 1+2 ] ==> binary |
|
|
1148 |
|
1
|
1149 static int |
|
|
1150 looks_like_bin_op (int spc_prev, int spc_next) |
|
|
1151 { |
|
608
|
1152 return ((spc_prev && spc_next) || ! spc_prev); |
|
1
|
1153 } |
|
|
1154 |
|
1488
|
1155 // Duh. This seems to no longer be needed. |
|
|
1156 #if 0 |
|
1
|
1157 static int |
|
|
1158 next_char_is_space (void) |
|
|
1159 { |
|
|
1160 int c = yyinput (); |
|
|
1161 yyunput (c, yytext); |
|
|
1162 return (c == ' ' || c == '\t'); |
|
|
1163 } |
|
1488
|
1164 #endif |
|
1
|
1165 |
|
767
|
1166 // Try to determine if the next token should be treated as a postfix |
|
|
1167 // unary operator. This is ugly, but it seems to do the right thing. |
|
|
1168 |
|
1
|
1169 static int |
|
|
1170 next_token_is_postfix_unary_op (int spc_prev, char *yytext) |
|
|
1171 { |
|
|
1172 int un_op = 0; |
|
|
1173 |
|
|
1174 int c0 = yyinput (); |
|
|
1175 int c1 = yyinput (); |
|
|
1176 |
|
|
1177 yyunput (c1, yytext); |
|
|
1178 yyunput (c0, yytext); |
|
|
1179 |
|
|
1180 int transpose = (c0 == '.' && c1 == '\''); |
|
|
1181 int hermitian = (c0 == '\''); |
|
|
1182 |
|
|
1183 un_op = (transpose || (hermitian && ! spc_prev)); |
|
|
1184 |
|
|
1185 return un_op; |
|
|
1186 } |
|
|
1187 |
|
767
|
1188 // Try to determine if the next token should be treated as a binary |
|
|
1189 // operator. This is even uglier, but it also seems to do the right |
|
1276
|
1190 // thing. Note that it is only necessary to check the spacing for `+' |
|
|
1191 // and `-', since those are the only tokens that can appear as unary |
|
|
1192 // ops too. |
|
767
|
1193 |
|
1
|
1194 static int |
|
|
1195 next_token_is_bin_op (int spc_prev, char *yytext) |
|
|
1196 { |
|
|
1197 int bin_op = 0; |
|
|
1198 |
|
|
1199 int c0 = yyinput (); |
|
|
1200 |
|
|
1201 switch (c0) |
|
|
1202 { |
|
777
|
1203 case '+': |
|
|
1204 case '-': |
|
1276
|
1205 { |
|
|
1206 int c1 = yyinput (); |
|
|
1207 yyunput (c1, yytext); |
|
|
1208 int spc_next = (c1 == ' ' || c1 == '\t'); |
|
|
1209 bin_op = looks_like_bin_op (spc_prev, spc_next); |
|
|
1210 } |
|
|
1211 break; |
|
|
1212 |
|
777
|
1213 case '/': |
|
|
1214 case ':': |
|
|
1215 case '\\': |
|
|
1216 case '^': |
|
1
|
1217 case '&': |
|
|
1218 case '*': |
|
|
1219 case '|': |
|
|
1220 case '<': |
|
|
1221 case '>': |
|
777
|
1222 case '~': |
|
|
1223 case '!': |
|
|
1224 case '=': |
|
1
|
1225 case '.': |
|
1276
|
1226 bin_op = 1; |
|
1
|
1227 break; |
|
|
1228 |
|
|
1229 default: |
|
1276
|
1230 break; |
|
1
|
1231 } |
|
|
1232 |
|
|
1233 yyunput (c0, yytext); |
|
|
1234 |
|
|
1235 return bin_op; |
|
|
1236 } |
|
|
1237 |
|
767
|
1238 // Used to delete trailing white space from tokens. |
|
|
1239 |
|
146
|
1240 static char * |
|
1
|
1241 strip_trailing_whitespace (char *s) |
|
|
1242 { |
|
1266
|
1243 static char *retval = 0; |
|
|
1244 |
|
|
1245 delete [] retval; |
|
|
1246 |
|
|
1247 retval = strsave (s); |
|
1
|
1248 |
|
|
1249 char *t = strchr (retval, ' '); |
|
522
|
1250 if (t) |
|
1
|
1251 *t = '\0'; |
|
|
1252 |
|
|
1253 t = strchr (retval, '\t'); |
|
522
|
1254 if (t) |
|
1
|
1255 *t = '\0'; |
|
|
1256 |
|
|
1257 return retval; |
|
|
1258 } |
|
|
1259 |
|
1001
|
1260 // Discard whitespace, including comments and continuations. |
|
1088
|
1261 // |
|
|
1262 // Return value is logical OR of the following values: |
|
|
1263 // |
|
|
1264 // ATE_SPACE_OR_TAB : space or tab in input |
|
|
1265 // ATE_NEWLINE : bare new line in input |
|
1001
|
1266 |
|
|
1267 static int |
|
975
|
1268 eat_whitespace (void) |
|
|
1269 { |
|
1001
|
1270 int retval = 0; |
|
975
|
1271 int in_comment = 0; |
|
|
1272 int c; |
|
|
1273 while ((c = yyinput ()) != EOF) |
|
|
1274 { |
|
|
1275 current_input_column++; |
|
|
1276 |
|
|
1277 switch (c) |
|
|
1278 { |
|
|
1279 case ' ': |
|
|
1280 case '\t': |
|
1088
|
1281 retval |= ATE_SPACE_OR_TAB; |
|
975
|
1282 break; |
|
|
1283 |
|
|
1284 case '\n': |
|
1088
|
1285 retval |= ATE_NEWLINE; |
|
975
|
1286 in_comment = 0; |
|
|
1287 current_input_column = 0; |
|
|
1288 break; |
|
|
1289 |
|
|
1290 case '#': |
|
|
1291 case '%': |
|
|
1292 in_comment = 1; |
|
|
1293 break; |
|
|
1294 |
|
1001
|
1295 case '.': |
|
|
1296 if (in_comment) |
|
|
1297 break; |
|
|
1298 else |
|
|
1299 { |
|
|
1300 if (have_ellipsis_continuation ()) |
|
|
1301 break; |
|
|
1302 else |
|
|
1303 goto done; |
|
|
1304 } |
|
|
1305 |
|
|
1306 case '\\': |
|
|
1307 if (in_comment) |
|
|
1308 break; |
|
|
1309 else |
|
|
1310 { |
|
|
1311 if (have_continuation ()) |
|
|
1312 break; |
|
|
1313 else |
|
|
1314 goto done; |
|
|
1315 } |
|
|
1316 |
|
975
|
1317 default: |
|
|
1318 if (in_comment) |
|
|
1319 break; |
|
|
1320 else |
|
|
1321 goto done; |
|
|
1322 } |
|
|
1323 } |
|
|
1324 |
|
|
1325 done: |
|
|
1326 yyunput (c, yytext); |
|
1082
|
1327 current_input_column--; |
|
1001
|
1328 return retval; |
|
975
|
1329 } |
|
|
1330 |
|
|
1331 static void |
|
972
|
1332 handle_number (char *yytext) |
|
|
1333 { |
|
|
1334 double value; |
|
|
1335 int nread = sscanf (yytext, "%lf", &value); |
|
|
1336 |
|
985
|
1337 // If yytext doesn't contain a valid number, we are in deep doo doo. |
|
|
1338 |
|
972
|
1339 assert (nread == 1); |
|
|
1340 |
|
|
1341 quote_is_transpose = 1; |
|
|
1342 cant_be_identifier = 1; |
|
|
1343 convert_spaces_to_comma = 1; |
|
|
1344 |
|
|
1345 if (plotting && ! in_plot_range) |
|
|
1346 past_plot_range = 1; |
|
|
1347 |
|
|
1348 yylval.tok_val = new token (value, yytext, input_line_number, |
|
|
1349 current_input_column); |
|
|
1350 |
|
|
1351 token_stack.push (yylval.tok_val); |
|
|
1352 |
|
|
1353 current_input_column += yyleng; |
|
|
1354 |
|
|
1355 do_comma_insert_check (); |
|
|
1356 } |
|
|
1357 |
|
1001
|
1358 // We have seen a backslash and need to find out if it should be |
|
|
1359 // treated as a continuation character. If so, this eats it, up to |
|
|
1360 // and including the new line character. |
|
|
1361 // |
|
973
|
1362 // Match whitespace only, followed by a comment character or newline. |
|
|
1363 // Once a comment character is found, discard all input until newline. |
|
|
1364 // If non-whitespace characters are found before comment |
|
|
1365 // characters, return 0. Otherwise, return 1. |
|
|
1366 |
|
|
1367 static int |
|
1091
|
1368 have_continuation (int trailing_comments_ok) |
|
973
|
1369 { |
|
|
1370 ostrstream buf; |
|
|
1371 |
|
|
1372 int in_comment = 0; |
|
|
1373 char c; |
|
|
1374 while ((c = yyinput ()) != EOF) |
|
|
1375 { |
|
|
1376 buf << (char) c; |
|
|
1377 |
|
|
1378 switch (c) |
|
|
1379 { |
|
|
1380 case ' ': |
|
|
1381 case '\t': |
|
|
1382 break; |
|
|
1383 |
|
|
1384 case '%': |
|
|
1385 case '#': |
|
1091
|
1386 if (trailing_comments_ok) |
|
|
1387 in_comment = 1; |
|
|
1388 else |
|
|
1389 goto cleanup; |
|
973
|
1390 break; |
|
|
1391 |
|
|
1392 case '\n': |
|
975
|
1393 current_input_column = 0; |
|
1001
|
1394 promptflag--; |
|
973
|
1395 return 1; |
|
|
1396 |
|
|
1397 default: |
|
1091
|
1398 if (! in_comment) |
|
|
1399 goto cleanup; |
|
|
1400 break; |
|
973
|
1401 } |
|
|
1402 } |
|
|
1403 |
|
|
1404 yyunput (c, yytext); |
|
1091
|
1405 return 0; |
|
973
|
1406 |
|
1091
|
1407 cleanup: |
|
|
1408 buf << ends; |
|
|
1409 char *s = buf.str (); |
|
|
1410 if (s) |
|
|
1411 { |
|
|
1412 int len = strlen (s); |
|
|
1413 while (len--) |
|
|
1414 yyunput (s[len], yytext); |
|
|
1415 } |
|
|
1416 delete [] s; |
|
973
|
1417 return 0; |
|
|
1418 } |
|
|
1419 |
|
1001
|
1420 // We have seen a `.' and need to see if it is the start of a |
|
|
1421 // continuation. If so, this eats it, up to and including the new |
|
|
1422 // line character. |
|
|
1423 |
|
973
|
1424 static int |
|
1091
|
1425 have_ellipsis_continuation (int trailing_comments_ok) |
|
973
|
1426 { |
|
|
1427 char c1 = yyinput (); |
|
|
1428 if (c1 == '.') |
|
|
1429 { |
|
|
1430 char c2 = yyinput (); |
|
1091
|
1431 if (c2 == '.' && have_continuation (trailing_comments_ok)) |
|
973
|
1432 return 1; |
|
|
1433 else |
|
|
1434 { |
|
|
1435 yyunput (c2, yytext); |
|
|
1436 yyunput (c1, yytext); |
|
|
1437 } |
|
|
1438 } |
|
|
1439 else |
|
|
1440 yyunput (c1, yytext); |
|
|
1441 |
|
|
1442 return 0; |
|
|
1443 } |
|
|
1444 |
|
1001
|
1445 // See if we have a continuation line. If so, eat it and the leading |
|
|
1446 // whitespace on the next line. |
|
1088
|
1447 // |
|
|
1448 // Return value is the same as described for eat_whitespace(). |
|
1001
|
1449 |
|
|
1450 static int |
|
|
1451 eat_continuation (void) |
|
|
1452 { |
|
|
1453 int retval = 0; |
|
|
1454 int c = yyinput (); |
|
|
1455 if ((c == '.' && have_ellipsis_continuation ()) |
|
|
1456 || (c == '\\' && have_continuation ())) |
|
|
1457 retval = eat_whitespace (); |
|
|
1458 else |
|
|
1459 yyunput (c, yytext); |
|
|
1460 |
|
|
1461 return retval; |
|
|
1462 } |
|
|
1463 |
|
973
|
1464 static int |
|
975
|
1465 handle_string (char delim, int text_style) |
|
973
|
1466 { |
|
|
1467 ostrstream buf; |
|
|
1468 |
|
|
1469 int c; |
|
1031
|
1470 int escape_pending = 0; |
|
973
|
1471 |
|
|
1472 while ((c = yyinput ()) != EOF) |
|
|
1473 { |
|
|
1474 current_input_column++; |
|
|
1475 |
|
|
1476 if (c == '\\') |
|
|
1477 { |
|
1053
|
1478 if (escape_pending) |
|
|
1479 { |
|
|
1480 buf << (char) c; |
|
|
1481 escape_pending = 0; |
|
|
1482 } |
|
|
1483 else |
|
|
1484 { |
|
1091
|
1485 if (have_continuation (0)) |
|
1053
|
1486 escape_pending = 0; |
|
|
1487 else |
|
|
1488 { |
|
|
1489 buf << (char) c; |
|
|
1490 escape_pending = 1; |
|
|
1491 } |
|
|
1492 } |
|
1031
|
1493 continue; |
|
973
|
1494 } |
|
|
1495 else if (c == '.') |
|
|
1496 { |
|
1091
|
1497 if (! have_ellipsis_continuation (0)) |
|
973
|
1498 buf << (char) c; |
|
|
1499 } |
|
|
1500 else if (c == '\n') |
|
|
1501 { |
|
1053
|
1502 error ("unterminated string constant"); |
|
973
|
1503 break; |
|
|
1504 } |
|
|
1505 else if (c == delim) |
|
|
1506 { |
|
1031
|
1507 if (escape_pending) |
|
973
|
1508 buf << (char) c; |
|
|
1509 else |
|
|
1510 { |
|
|
1511 c = yyinput (); |
|
|
1512 if (c == delim) |
|
|
1513 buf << (char) c; |
|
|
1514 else |
|
|
1515 { |
|
|
1516 yyunput (c, yytext); |
|
|
1517 buf << ends; |
|
|
1518 char *tok = buf.str (); |
|
|
1519 do_string_escapes (tok); |
|
975
|
1520 |
|
|
1521 if (text_style && doing_set) |
|
|
1522 { |
|
|
1523 if (tok) |
|
|
1524 { |
|
|
1525 int len = strlen (tok) + 3; |
|
|
1526 char *tmp = tok; |
|
|
1527 tok = new char [len]; |
|
|
1528 tok[0] = delim; |
|
|
1529 strcpy (tok+1, tmp); |
|
|
1530 tok[len-2] = delim; |
|
|
1531 tok[len-1] = '\0'; |
|
|
1532 delete [] tmp; |
|
|
1533 } |
|
|
1534 } |
|
|
1535 else |
|
|
1536 { |
|
|
1537 quote_is_transpose = 1; |
|
|
1538 cant_be_identifier = 1; |
|
|
1539 convert_spaces_to_comma = 1; |
|
|
1540 } |
|
|
1541 |
|
973
|
1542 yylval.tok_val = new token (tok); |
|
|
1543 delete [] tok; |
|
|
1544 token_stack.push (yylval.tok_val); |
|
|
1545 return TEXT; |
|
|
1546 } |
|
|
1547 } |
|
|
1548 } |
|
|
1549 else |
|
|
1550 { |
|
|
1551 buf << (char) c; |
|
|
1552 } |
|
|
1553 |
|
1031
|
1554 escape_pending = 0; |
|
973
|
1555 } |
|
|
1556 |
|
|
1557 return LEXICAL_ERROR; |
|
|
1558 } |
|
|
1559 |
|
971
|
1560 static int |
|
1001
|
1561 handle_close_brace (int spc_gobbled) |
|
971
|
1562 { |
|
985
|
1563 if (! nesting_level.empty ()) |
|
971
|
1564 { |
|
985
|
1565 nesting_level.pop (); |
|
971
|
1566 braceflag--; |
|
|
1567 } |
|
|
1568 |
|
|
1569 if (braceflag == 0) |
|
1001
|
1570 BEGIN 0; |
|
|
1571 |
|
971
|
1572 int c1 = yyinput (); |
|
|
1573 if (c1 == '=') |
|
|
1574 { |
|
|
1575 quote_is_transpose = 0; |
|
|
1576 cant_be_identifier = 0; |
|
|
1577 convert_spaces_to_comma = 1; |
|
|
1578 |
|
|
1579 int c2 = yyinput (); |
|
|
1580 unput (c2); |
|
|
1581 unput (c1); |
|
|
1582 |
|
|
1583 if (c2 != '=' && maybe_screwed_again) |
|
|
1584 return SCREW_TWO; |
|
|
1585 else |
|
|
1586 return ']'; |
|
|
1587 } |
|
|
1588 else |
|
|
1589 { |
|
|
1590 unput (c1); |
|
|
1591 |
|
985
|
1592 if (braceflag && user_pref.whitespace_in_literal_matrix != 2) |
|
971
|
1593 { |
|
1001
|
1594 int bin_op = next_token_is_bin_op (spc_gobbled, yytext); |
|
971
|
1595 int postfix_un_op = next_token_is_postfix_unary_op |
|
1001
|
1596 (spc_gobbled, yytext); |
|
971
|
1597 |
|
|
1598 int other_op = match_any (c1, ",;\n]"); |
|
|
1599 |
|
|
1600 if (! (postfix_un_op || bin_op || other_op |
|
985
|
1601 || nesting_level.empty ()) |
|
|
1602 && nesting_level.top () == BRACE |
|
971
|
1603 && convert_spaces_to_comma) |
|
|
1604 { |
|
|
1605 unput (','); |
|
|
1606 return ']'; |
|
|
1607 } |
|
|
1608 } |
|
|
1609 } |
|
|
1610 |
|
|
1611 quote_is_transpose = 1; |
|
|
1612 cant_be_identifier = 0; |
|
|
1613 convert_spaces_to_comma = 1; |
|
|
1614 return ']'; |
|
|
1615 } |
|
|
1616 |
|
1072
|
1617 static void |
|
|
1618 maybe_unput_comma (int spc_gobbled) |
|
|
1619 { |
|
|
1620 if (user_pref.whitespace_in_literal_matrix != 2 |
|
|
1621 && ! nesting_level.empty () |
|
|
1622 && nesting_level.top () == BRACE) |
|
|
1623 { |
|
|
1624 int bin_op = next_token_is_bin_op (spc_gobbled, yytext); |
|
|
1625 |
|
|
1626 int postfix_un_op = next_token_is_postfix_unary_op (spc_gobbled, |
|
|
1627 yytext); |
|
|
1628 |
|
|
1629 int c1 = yyinput (); |
|
|
1630 int c2 = yyinput (); |
|
|
1631 unput (c2); |
|
|
1632 unput (c1); |
|
|
1633 int sep_op = match_any (c1, ",;\n]"); |
|
|
1634 int dot_op = (c1 == '.' |
|
|
1635 && (isalpha (c2) || isspace (c2) || c2 == '_')); |
|
|
1636 int index_op = (c1 == '(' |
|
|
1637 && (user_pref.whitespace_in_literal_matrix == 0 |
|
|
1638 || ! spc_gobbled)); |
|
|
1639 |
|
|
1640 if (! (postfix_un_op || bin_op || sep_op || dot_op || index_op)) |
|
|
1641 unput (','); |
|
|
1642 } |
|
|
1643 } |
|
|
1644 |
|
767
|
1645 // Figure out exactly what kind of token to return when we have seen |
|
|
1646 // an identifier. Handles keywords. |
|
|
1647 |
|
146
|
1648 static int |
|
1001
|
1649 handle_identifier (char *tok, int spc_gobbled) |
|
146
|
1650 { |
|
883
|
1651 // It is almost always an error for an identifier to be followed |
|
|
1652 // directly by another identifier. Special cases are handled below. |
|
|
1653 |
|
|
1654 cant_be_identifier = 1; |
|
|
1655 |
|
747
|
1656 // If we are expecting a structure element, we just want to return |
|
1072
|
1657 // TEXT_ID, which is a string that is also a valid identifier. But |
|
|
1658 // first, we have to decide whether to insert a comma. |
|
747
|
1659 |
|
|
1660 if (looking_at_indirect_ref) |
|
1072
|
1661 { |
|
|
1662 maybe_unput_comma (spc_gobbled); |
|
|
1663 TOK_PUSH_AND_RETURN (tok, TEXT_ID); |
|
|
1664 } |
|
747
|
1665 |
|
883
|
1666 // If we have a regular keyword, or a plot STYLE, return it. Keywords |
|
|
1667 // can be followed by identifiers (TOK_RETURN handles that). |
|
146
|
1668 |
|
|
1669 int kw_token = is_keyword (tok); |
|
|
1670 if (kw_token) |
|
|
1671 { |
|
|
1672 if (kw_token == STYLE) |
|
|
1673 { |
|
1060
|
1674 current_input_column += yyleng; |
|
146
|
1675 quote_is_transpose = 0; |
|
|
1676 convert_spaces_to_comma = 1; |
|
|
1677 return kw_token; |
|
|
1678 } |
|
|
1679 else |
|
|
1680 TOK_RETURN (kw_token); |
|
|
1681 } |
|
|
1682 |
|
883
|
1683 // See if we have a plot keyword (title, using, with, or clear). |
|
146
|
1684 |
|
941
|
1685 if (plotting) |
|
|
1686 { |
|
146
|
1687 // Yes, we really do need both of these plot_range variables. One |
|
|
1688 // is used to mark when we are past all possiblity of a plot range, |
|
|
1689 // the other is used to mark when we are actually between the square |
|
|
1690 // brackets that surround the range. |
|
|
1691 |
|
941
|
1692 if (! in_plot_range) |
|
|
1693 past_plot_range = 1; |
|
|
1694 |
|
1273
|
1695 // Option keywords can't appear in parentheses or braces. |
|
|
1696 |
|
|
1697 int plot_option_kw = 0; |
|
|
1698 if (nesting_level.empty ()) |
|
|
1699 plot_option_kw = is_plot_keyword (tok); |
|
941
|
1700 |
|
|
1701 if (cant_be_identifier && plot_option_kw) |
|
|
1702 TOK_RETURN (plot_option_kw); |
|
|
1703 } |
|
146
|
1704 |
|
|
1705 // If we are looking at a text style function, set up to gobble its |
|
|
1706 // arguments. These are also reserved words, but only because it |
|
|
1707 // would be very difficult to do anything intelligent with them if |
|
|
1708 // they were not reserved. |
|
|
1709 |
|
|
1710 if (is_text_function_name (tok)) |
|
|
1711 { |
|
|
1712 BEGIN TEXT_FCN; |
|
|
1713 |
|
1420
|
1714 if (strcmp (tok, "set") == 0) |
|
146
|
1715 doing_set = 1; |
|
|
1716 } |
|
|
1717 |
|
1001
|
1718 int c = yyinput (); |
|
|
1719 yyunput (c, yytext); |
|
|
1720 int next_tok_is_eq = (c == '='); |
|
|
1721 |
|
146
|
1722 // Make sure we put the return values of a function in the symbol |
|
|
1723 // table that is local to the function. |
|
|
1724 |
|
|
1725 if (next_tok_is_eq && defining_func && maybe_screwed) |
|
|
1726 curr_sym_tab = tmp_local_sym_tab; |
|
|
1727 |
|
|
1728 // Find the token in the symbol table. |
|
|
1729 |
|
|
1730 yylval.tok_val = new token (lookup_identifier (tok), |
|
|
1731 input_line_number, |
|
|
1732 current_input_column); |
|
|
1733 |
|
|
1734 token_stack.push (yylval.tok_val); |
|
|
1735 |
|
|
1736 // After seeing an identifer, it is ok to convert spaces to a comma |
|
|
1737 // (if needed). |
|
|
1738 |
|
|
1739 convert_spaces_to_comma = 1; |
|
|
1740 |
|
|
1741 // If we are defining a function and we have not seen the parameter |
|
|
1742 // list yet and the next token is `=', return a token that represents |
|
|
1743 // the only return value for the function. For example, |
|
|
1744 // |
|
|
1745 // function SCREW = f (args); |
|
|
1746 // |
|
|
1747 // The variable maybe_screwed is reset in parse.y. |
|
|
1748 |
|
|
1749 if (next_tok_is_eq) |
|
|
1750 { |
|
1060
|
1751 current_input_column += yyleng; |
|
146
|
1752 if (defining_func && maybe_screwed) |
|
|
1753 return SCREW; |
|
|
1754 else |
|
|
1755 return NAME; |
|
|
1756 } |
|
|
1757 |
|
|
1758 // At this point, we are only dealing with identifiers that are not |
|
|
1759 // followed by `=' (if the next token is `=', there is no need to |
|
|
1760 // check to see if we should insert a comma (invalid syntax), or allow |
|
|
1761 // a following `'' to be treated as a transpose (the next token is |
|
|
1762 // `=', so it can't be `''. |
|
|
1763 |
|
|
1764 quote_is_transpose = 1; |
|
|
1765 do_comma_insert_check (); |
|
|
1766 |
|
1072
|
1767 maybe_unput_comma (spc_gobbled); |
|
146
|
1768 |
|
1060
|
1769 current_input_column += yyleng; |
|
146
|
1770 return NAME; |
|
|
1771 } |
|
|
1772 |
|
767
|
1773 // Print a warning if a function file that defines a function has |
|
|
1774 // anything other than comments and whitespace following the END token |
|
|
1775 // that matches the FUNCTION statement. |
|
|
1776 |
|
1
|
1777 void |
|
|
1778 check_for_garbage_after_fcn_def (void) |
|
|
1779 { |
|
|
1780 // By making a newline be the next character to be read, we will force |
|
|
1781 // the parser to return after reading the function. Calling yyunput |
|
|
1782 // with EOF seems not to work... |
|
|
1783 |
|
|
1784 int in_comment = 0; |
|
|
1785 int lineno = input_line_number; |
|
|
1786 int c; |
|
|
1787 while ((c = yyinput ()) != EOF) |
|
|
1788 { |
|
|
1789 switch (c) |
|
|
1790 { |
|
|
1791 case ' ': |
|
|
1792 case '\t': |
|
|
1793 case ';': |
|
|
1794 case ',': |
|
|
1795 break; |
|
777
|
1796 |
|
1
|
1797 case '\n': |
|
|
1798 if (in_comment) |
|
|
1799 in_comment = 0; |
|
|
1800 break; |
|
777
|
1801 |
|
1
|
1802 case '%': |
|
|
1803 case '#': |
|
|
1804 in_comment = 1; |
|
|
1805 break; |
|
777
|
1806 |
|
1
|
1807 default: |
|
|
1808 if (in_comment) |
|
|
1809 break; |
|
|
1810 else |
|
|
1811 { |
|
|
1812 warning ("ignoring trailing garbage after end of function\n\ |
|
341
|
1813 near line %d of file `%s.m'", lineno, curr_fcn_file_name); |
|
1
|
1814 |
|
|
1815 yyunput ('\n', yytext); |
|
|
1816 return; |
|
|
1817 } |
|
|
1818 } |
|
|
1819 } |
|
|
1820 yyunput ('\n', yytext); |
|
|
1821 } |
|
|
1822 |
|
767
|
1823 /* |
|
|
1824 |
|
|
1825 Maybe someday... |
|
1
|
1826 |
|
|
1827 "+=" return ADD_EQ; |
|
|
1828 "-=" return SUB_EQ; |
|
|
1829 "*=" return MUL_EQ; |
|
|
1830 "/=" return DIV_EQ; |
|
|
1831 "\\=" return LEFTDIV_EQ; |
|
|
1832 ".+=" return ADD_EQ; |
|
|
1833 ".-=" return SUB_EQ; |
|
|
1834 ".*=" return EMUL_EQ; |
|
|
1835 "./=" return EDIV_EQ; |
|
|
1836 ".\\=" return ELEFTDIV_EQ; |
|
|
1837 |
|
|
1838 */ |
