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1
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1 /* lex.l -*- C -*- |
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2 |
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296
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3 Copyright (C) 1992, 1993, 1994 John W. Eaton |
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1
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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, 675 Mass Ave, Cambridge, MA 02139, USA. |
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20 |
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21 */ |
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22 |
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23 %x NEW_MATRIX |
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24 %x HELP_FCN |
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25 %s TEXT_FCN |
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26 %s DQSTRING |
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27 %s STRING |
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28 %s MATRIX |
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29 |
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30 %{ |
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428
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31 #define SHORT_CIRCUIT_LOGICALS 1 |
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1
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32 |
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240
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33 #ifdef HAVE_CONFIG_H |
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34 #include "config.h" |
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35 #endif |
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36 |
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522
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37 #include <string.h> |
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38 |
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1
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39 #include "input.h" |
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143
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40 #include "token.h" |
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1
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41 |
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42 #include "SLStack.h" |
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43 |
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143
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44 // Stack to hold tokens so that we can delete them when the parser is |
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45 // reset and avoid growing forever just because we are stashing some |
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46 // information. This has to appear before lex.h is included, because |
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47 // one of the macros defined there uses token_stack. |
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48 static SLStack <token*> token_stack; |
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49 |
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430
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50 #include "user-prefs.h" |
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1
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51 #include "variables.h" |
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143
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52 #include "octave.h" |
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1
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53 #include "symtab.h" |
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54 #include "error.h" |
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55 #include "utils.h" |
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584
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56 #include "tree-base.h" |
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57 #include "tree-expr.h" |
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58 #include "tree-cmd.h" |
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576
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59 #include "tree-misc.h" |
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488
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60 #include "tree-plot.h" |
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61 #include "tree-const.h" |
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1
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62 #include "y.tab.h" |
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63 #include "parse.h" |
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64 #include "lex.h" |
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65 |
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66 // Nonzero means we think we are looking at a set command. |
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67 static int doing_set = 0; |
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68 |
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69 // GAG. Stupid kludge so that [[1,2][3,4]] will work. |
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70 static do_comma_insert = 0; |
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71 |
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72 // Brace level count. |
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73 static int braceflag = 0; |
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74 |
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75 // Return transpose or start a string? |
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240
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76 int quote_is_transpose = 0; |
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1
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77 |
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440
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78 // Nonzero means we thing we are looking at the beginning of a |
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79 // function definition. |
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80 int beginning_of_function = 0; |
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81 |
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1
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82 // Nonzero means that we should convert spaces to a comma inside a |
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83 // matrix definition. |
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84 static int convert_spaces_to_comma = 1; |
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85 |
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86 // Another context hack, this time for the plot command's `using', |
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87 // `title', and `with' keywords. |
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88 static int cant_be_identifier = 0; |
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89 |
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90 // Is the closest nesting level a square brace or a paren? |
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91 // |
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92 // 1 -> brace, spaces are important (they can turn into commas) |
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93 // 0 -> paren, spaces are not important |
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94 // |
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95 static SLStack <int> in_brace_or_paren; |
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96 |
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146
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97 // Forward declarations for functions defined at the bottom of this |
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98 // file. |
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99 |
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1
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100 static void do_string_escapes (char *s); |
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101 static void fixup_column_count (char *s); |
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146
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102 static void do_comma_insert_check (void); |
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1
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103 static int is_plot_keyword (char *s); |
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104 static int is_keyword (char *s); |
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105 static char *plot_style_token (char *s); |
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106 static symbol_record *lookup_identifier (char *s); |
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107 static void grab_help_text (void); |
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108 static int match_any (char c, char *s); |
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109 static int next_token_is_bin_op (int spc_prev, char *yytext); |
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110 static int next_token_is_postfix_unary_op (int spc_prev, char *yytext); |
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111 static char *strip_trailing_whitespace (char *s); |
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146
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112 static int handle_identifier (char *s, int next_tok_is_eq); |
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113 |
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114 %} |
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115 |
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116 D [0-9] |
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117 S [ \t] |
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118 N [\n] |
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119 SN [ \t\n] |
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120 EL (\.\.\.) |
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121 Im [iIjJ] |
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122 QQ (\'\') |
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123 ECHAR (\\.) |
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124 QSTR ([^\n\'\\]*({QQ}|{ECHAR})*) |
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125 DQSTR ([^\n\"\\]*{ECHAR}*) |
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126 IDENT ([_a-zA-Z][_a-zA-Z0-9]*) |
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127 EXPON ([DdEe][+-]?{D}+) |
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128 %% |
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129 |
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130 <NEW_MATRIX>[^ \t\n] { |
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131 yyless (0); |
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132 BEGIN MATRIX; |
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133 } |
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134 |
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135 <NEW_MATRIX>{SN}* { |
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136 fixup_column_count (yytext); |
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137 BEGIN MATRIX; |
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138 } |
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139 |
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140 <HELP_FCN>\n | |
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141 <TEXT_FCN>\n { |
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142 BEGIN 0; |
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143
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143 current_input_column = 1; |
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1
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144 quote_is_transpose = 0; |
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145 cant_be_identifier = 0; |
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146 convert_spaces_to_comma = 1; |
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147 return '\n'; |
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148 } |
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149 |
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150 <TEXT_FCN>[\;\,] { |
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191
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151 if (doing_set && strcmp (yytext, ",") == 0) |
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1
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152 { |
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143
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153 yylval.tok_val = new token (yytext); |
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154 token_stack.push (yylval.tok_val); |
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155 TOK_RETURN (TEXT); |
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1
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156 } |
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157 else |
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158 { |
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159 BEGIN 0; |
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191
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160 if (strcmp (yytext, ",") == 0) |
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161 TOK_RETURN (','); |
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162 else |
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163 TOK_RETURN (';'); |
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1
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164 } |
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165 } |
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166 |
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167 <HELP_FCN>[^ \t\n]*{S}* | |
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168 <TEXT_FCN>[^ \t\n\;\,]*{S}* { |
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522
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169 static char *tok = 0; |
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143
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170 delete [] tok; |
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171 tok = strip_trailing_whitespace (yytext); |
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172 yylval.tok_val = new token (tok); |
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173 token_stack.push (yylval.tok_val); |
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174 TOK_RETURN (TEXT); |
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175 } |
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1
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176 |
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177 <TEXT_FCN>\'{QSTR}*[\n\'] { |
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178 if (yytext[yyleng-1] == '\n') |
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179 { |
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180 error ("unterminated string constant"); |
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143
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181 current_input_column = 1; |
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627
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182 return LEXICAL_ERROR; |
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1
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183 } |
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184 else |
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185 { |
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522
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186 static char *tok = 0; |
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143
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187 delete [] tok; |
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1
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188 int off1 = doing_set ? 0 : 1; |
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189 int off2 = doing_set ? 0 : 2; |
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143
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190 tok = strsave (&yytext[off1]); |
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191 tok[yyleng-off2] = '\0'; |
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192 do_string_escapes (tok); |
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193 yylval.tok_val = new token (tok); |
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194 token_stack.push (yylval.tok_val); |
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1
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195 current_input_column += yyleng; |
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196 } |
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197 return TEXT; |
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198 } |
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199 |
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200 <TEXT_FCN>\"{DQSTR}*[\n\"] { |
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201 if (yytext[yyleng-1] == '\n') |
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202 { |
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203 error ("unterminated string constant"); |
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143
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204 current_input_column = 1; |
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627
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205 return LEXICAL_ERROR; |
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1
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206 } |
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207 else |
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208 { |
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522
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209 static char *tok = 0; |
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143
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210 delete [] tok; |
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1
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211 int off1 = doing_set ? 0 : 1; |
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212 int off2 = doing_set ? 0 : 2; |
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143
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213 tok = strsave (&yytext[off1]); |
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214 tok[yyleng-off2] = '\0'; |
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215 do_string_escapes (tok); |
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216 yylval.tok_val = new token (tok); |
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217 token_stack.push (yylval.tok_val); |
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1
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218 current_input_column += yyleng; |
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219 } |
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220 return TEXT; |
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221 } |
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222 |
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223 <TEXT_FCN>{S}* { current_input_column += yyleng; } |
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224 |
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225 <STRING>{QSTR}*[\n\'] { |
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226 if (braceflag) |
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227 BEGIN MATRIX; |
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228 else |
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229 BEGIN 0; |
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230 |
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231 if (yytext[yyleng-1] == '\n') |
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232 { |
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233 error ("unterminated string constant"); |
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143
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234 current_input_column = 1; |
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627
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235 return LEXICAL_ERROR; |
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1
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236 } |
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237 else |
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238 { |
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522
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239 static char *tok = 0; |
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143
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240 delete [] tok; |
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241 tok = strsave (yytext); |
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242 tok[yyleng-1] = '\0'; |
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243 do_string_escapes (tok); |
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244 yylval.tok_val = new token (tok); |
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245 token_stack.push (yylval.tok_val); |
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246 quote_is_transpose = 1; |
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247 cant_be_identifier = 1; |
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248 convert_spaces_to_comma = 1; |
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1
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249 current_input_column += yyleng; |
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250 } |
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251 return TEXT; |
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252 } |
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253 |
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254 |
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255 <DQSTRING>{DQSTR}*[\n\"] { |
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256 if (braceflag) |
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257 BEGIN MATRIX; |
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258 else |
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259 BEGIN 0; |
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260 |
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261 if (yytext[yyleng-1] == '\n') |
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262 { |
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263 error ("unterminated string constant"); |
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143
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264 current_input_column = 1; |
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627
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265 return LEXICAL_ERROR; |
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1
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266 } |
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267 else |
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268 { |
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522
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269 static char *tok = 0; |
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143
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270 delete [] tok; |
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271 tok = strsave (yytext); |
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272 tok[yyleng-1] = '\0'; |
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273 do_string_escapes (tok); |
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274 yylval.tok_val = new token (tok); |
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275 token_stack.push (yylval.tok_val); |
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276 quote_is_transpose = 1; |
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277 cant_be_identifier = 1; |
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278 convert_spaces_to_comma = 1; |
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1
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279 current_input_column += yyleng; |
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280 } |
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281 return TEXT; |
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282 } |
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283 |
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284 <MATRIX>{SN}*\]{S}*/== { |
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285 |
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286 // For this and the next two rules, we're looking at ']', and we |
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287 // need to know if the next token is '='. |
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288 // |
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289 // All this so we can handle the bogus syntax |
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290 // |
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291 // [x,y] % an expression by itself |
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292 // [x,y] = expression % assignment to a list of identifiers |
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293 // [x,y] == expression % test for equality |
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294 // |
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295 // It would have been so much easier if the delimiters were simply |
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296 // different for the expression on the left hand side of the equals |
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297 // operator. |
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298 |
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299 in_brace_or_paren.pop (); |
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300 braceflag--; |
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301 if (braceflag == 0) |
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302 { |
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143
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303 if (! defining_func) |
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1
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304 promptflag++; |
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305 BEGIN 0; |
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306 } |
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307 fixup_column_count (yytext); |
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308 quote_is_transpose = 0; |
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309 cant_be_identifier = 0; |
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310 convert_spaces_to_comma = 1; |
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311 return ']'; |
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312 } |
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313 |
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314 <MATRIX>{SN}*\]{S}*/= { |
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315 in_brace_or_paren.pop (); |
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316 braceflag--; |
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317 if (braceflag == 0) |
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318 { |
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319 BEGIN 0; |
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143
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320 if (! defining_func) |
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1
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321 promptflag++; |
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322 } |
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323 fixup_column_count (yytext); |
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324 quote_is_transpose = 0; |
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325 cant_be_identifier = 0; |
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326 convert_spaces_to_comma = 1; |
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327 if (maybe_screwed_again) |
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328 return SCREW_TWO; |
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329 else |
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330 return ']'; |
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331 } |
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332 |
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333 <MATRIX>{SN}*\]{S}* { |
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334 fixup_column_count (yytext); |
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335 |
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430
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336 // It's a pain in the ass to decide whether to insert a comma after |
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337 // seeing a ']' character... |
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338 |
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1
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339 in_brace_or_paren.pop (); |
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340 braceflag--; |
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341 if (braceflag == 0) |
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342 { |
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143
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343 if (! defining_func) |
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1
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344 promptflag++; |
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345 BEGIN 0; |
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346 } |
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430
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347 else if (user_pref.commas_in_literal_matrix != 2) |
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1
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348 { |
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349 int c0 = yytext[yyleng-1]; |
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350 int spc_prev = (c0 == ' ' || c0 == '\t'); |
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351 int bin_op = next_token_is_bin_op (spc_prev, |
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352 yytext); |
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353 int postfix_un_op |
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354 = next_token_is_postfix_unary_op (spc_prev, |
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355 yytext); |
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356 |
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357 int c1 = yyinput (); |
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358 unput (c1); |
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359 int other_op = match_any (c1, ",;\n]"); |
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360 |
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361 if (! (postfix_un_op || bin_op || other_op) |
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362 && in_brace_or_paren.top () |
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363 && convert_spaces_to_comma) |
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364 { |
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430
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365 unput (','); |
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1
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366 return ']'; |
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367 } |
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368 } |
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369 |
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370 quote_is_transpose = 1; |
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371 cant_be_identifier = 0; |
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372 convert_spaces_to_comma = 1; |
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373 return ']'; |
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374 } |
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375 |
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143
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376 <MATRIX>{S}*\,{S}* { TOK_RETURN (','); } |
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1
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377 |
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378 <MATRIX>{S}+ { |
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430
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379 |
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380 // If commas are required, just eat the spaces. |
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1
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381 |
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430
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382 if (user_pref.commas_in_literal_matrix != 2) |
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383 { |
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384 int bin_op = next_token_is_bin_op (1, yytext); |
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385 int postfix_un_op |
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386 = next_token_is_postfix_unary_op (1, yytext); |
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387 |
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388 if (! (postfix_un_op || bin_op) |
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389 && in_brace_or_paren.top () |
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390 && convert_spaces_to_comma) |
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391 TOK_RETURN (','); |
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392 } |
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1
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393 } |
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394 |
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395 <MATRIX>{SN}*\;{SN}* | |
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396 <MATRIX>{N}{SN}* { |
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397 fixup_column_count (yytext); |
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398 quote_is_transpose = 0; |
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399 cant_be_identifier = 0; |
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400 convert_spaces_to_comma = 1; |
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401 return ';'; |
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402 } |
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403 |
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404 \] { |
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405 if (! in_brace_or_paren.empty ()) |
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406 in_brace_or_paren.pop (); |
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407 |
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113
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408 if (plotting && ! past_plot_range) |
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1
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409 { |
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410 in_plot_range = 0; |
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143
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411 TOK_RETURN (CLOSE_BRACE); |
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1
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412 } |
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413 else |
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143
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414 TOK_RETURN (']'); |
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1
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415 } |
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416 |
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620
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417 {D}+\.?{D}*{EXPON}?{Im} | |
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1
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418 \.{D}+{EXPON}?{Im} { |
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143
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419 double value; |
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420 int nread = sscanf (yytext, "%lf", &value); |
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1
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421 assert (nread == 1); |
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422 quote_is_transpose = 1; |
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423 cant_be_identifier = 1; |
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424 convert_spaces_to_comma = 1; |
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113
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425 if (plotting && ! in_plot_range) |
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426 past_plot_range = 1; |
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581
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427 yylval.tok_val = new token (value, yytext, |
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143
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428 input_line_number, |
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429 current_input_column); |
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430 token_stack.push (yylval.tok_val); |
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1
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431 current_input_column += yyleng; |
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146
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432 do_comma_insert_check (); |
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1
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433 return IMAG_NUM; |
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434 } |
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435 |
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620
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436 {D}+/\.[\*/\\^'] | |
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437 {D}+\.?{D}*{EXPON}? | |
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1
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438 \.{D}+{EXPON}? | |
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439 { |
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143
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440 double value; |
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441 int nread = sscanf (yytext, "%lf", &value); |
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1
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442 assert (nread == 1); |
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443 quote_is_transpose = 1; |
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444 cant_be_identifier = 1; |
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445 convert_spaces_to_comma = 1; |
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113
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446 if (plotting && ! in_plot_range) |
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447 past_plot_range = 1; |
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581
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448 yylval.tok_val = new token (value, yytext, |
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143
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449 input_line_number, |
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450 current_input_column); |
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451 token_stack.push (yylval.tok_val); |
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1
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452 current_input_column += yyleng; |
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146
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453 do_comma_insert_check (); |
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1
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454 return NUM; |
|
|
455 } |
|
|
456 |
|
|
457 \[{S}* { |
|
|
458 in_brace_or_paren.push (1); |
|
113
|
459 if (plotting && ! past_plot_range) |
|
1
|
460 { |
|
|
461 in_plot_range = 1; |
|
143
|
462 TOK_RETURN (OPEN_BRACE); |
|
1
|
463 } |
|
|
464 else |
|
|
465 { |
|
|
466 mlnm.push (1); |
|
|
467 braceflag++; |
|
|
468 promptflag--; |
|
|
469 BEGIN NEW_MATRIX; |
|
143
|
470 TOK_RETURN ('['); |
|
1
|
471 } |
|
|
472 } |
|
|
473 |
|
|
474 {S}* { current_input_column += yyleng; } |
|
|
475 |
|
206
|
476 {EL}{S}*\n { promptflag--; current_input_column = 1; } |
|
|
477 {EL} { return ELLIPSIS; } |
|
1
|
478 |
|
143
|
479 <<EOF>> TOK_RETURN (END_OF_INPUT); |
|
1
|
480 |
|
|
481 {IDENT}{S}* { |
|
|
482 |
|
|
483 // Truncate the token at the first space or tab but don't write |
|
|
484 // directly on yytext. |
|
|
485 |
|
522
|
486 static char *tok = 0; |
|
1
|
487 delete [] tok; |
|
|
488 tok = strip_trailing_whitespace (yytext); |
|
146
|
489 return handle_identifier (tok, 0); |
|
1
|
490 } |
|
|
491 |
|
146
|
492 {IDENT}/{S}*= { return handle_identifier (yytext, 1); } |
|
1
|
493 |
|
|
494 "\n" { |
|
|
495 quote_is_transpose = 0; |
|
|
496 cant_be_identifier = 0; |
|
143
|
497 current_input_column = 1; |
|
1
|
498 convert_spaces_to_comma = 1; |
|
|
499 return '\n'; |
|
|
500 } |
|
|
501 |
|
|
502 "'" { |
|
|
503 current_input_column++; |
|
|
504 convert_spaces_to_comma = 1; |
|
|
505 |
|
|
506 if (quote_is_transpose) |
|
|
507 { |
|
146
|
508 do_comma_insert_check (); |
|
1
|
509 return QUOTE; |
|
|
510 } |
|
|
511 else |
|
|
512 BEGIN STRING; |
|
|
513 } |
|
|
514 |
|
|
515 ":" { |
|
|
516 if (plotting && (in_plot_range || in_plot_using)) |
|
143
|
517 BIN_OP_RETURN (COLON, 1); |
|
1
|
518 else |
|
143
|
519 BIN_OP_RETURN (':', 0); |
|
1
|
520 } |
|
|
521 |
|
440
|
522 \% | |
|
|
523 \# { |
|
|
524 if (in_brace_or_paren.empty () && beginning_of_function) |
|
|
525 { |
|
|
526 grab_help_text (); |
|
|
527 beginning_of_function = 0; |
|
|
528 } |
|
|
529 else |
|
|
530 { |
|
|
531 int c; |
|
|
532 while ((c = yyinput ()) != EOF && c != '\n') |
|
|
533 ; // Eat comment. |
|
|
534 } |
|
|
535 |
|
|
536 current_input_column = 1; |
|
|
537 |
|
|
538 if (! braceflag || beginning_of_function) |
|
|
539 return '\n'; |
|
|
540 } |
|
|
541 |
|
1
|
542 \" { BEGIN DQSTRING; } |
|
143
|
543 ".*" { BIN_OP_RETURN (EMUL, 0); } |
|
|
544 "./" { BIN_OP_RETURN (EDIV, 0); } |
|
|
545 ".\\" { BIN_OP_RETURN (ELEFTDIV, 0); } |
|
661
|
546 ".**" | |
|
143
|
547 ".^" { BIN_OP_RETURN (EPOW, 0); } |
|
146
|
548 ".'" { do_comma_insert_check (); BIN_OP_RETURN (TRANSPOSE, 1); } |
|
|
549 "++" { do_comma_insert_check (); BIN_OP_RETURN (PLUS_PLUS, 1); } |
|
|
550 "--" { do_comma_insert_check (); BIN_OP_RETURN (MINUS_MINUS, 1); } |
|
143
|
551 "<=" { BIN_OP_RETURN (EXPR_LE, 0); } |
|
|
552 "==" { BIN_OP_RETURN (EXPR_EQ, 0); } |
|
661
|
553 "~=" | |
|
|
554 "!=" | |
|
143
|
555 "<>" { BIN_OP_RETURN (EXPR_NE, 0); } |
|
|
556 ">=" { BIN_OP_RETURN (EXPR_GE, 0); } |
|
428
|
557 "||" { |
|
|
558 #ifdef SHORT_CIRCUIT_LOGICALS |
|
|
559 BIN_OP_RETURN (EXPR_OR_OR, 0); |
|
|
560 #else |
|
|
561 BIN_OP_RETURN (EXPR_OR, 0); |
|
|
562 #endif |
|
|
563 } |
|
|
564 "&&" { |
|
|
565 #ifdef SHORT_CIRCUIT_LOGICALS |
|
|
566 BIN_OP_RETURN (EXPR_AND_AND, 0); |
|
|
567 #else |
|
|
568 BIN_OP_RETURN (EXPR_AND, 0); |
|
|
569 #endif |
|
|
570 } |
|
143
|
571 "|" { BIN_OP_RETURN (EXPR_OR, 0); } |
|
|
572 "&" { BIN_OP_RETURN (EXPR_AND, 0); } |
|
661
|
573 "!" | |
|
113
|
574 "~" { |
|
|
575 if (plotting && ! in_plot_range) |
|
|
576 past_plot_range = 1; |
|
143
|
577 BIN_OP_RETURN (EXPR_NOT, 0); |
|
113
|
578 } |
|
143
|
579 "<" { BIN_OP_RETURN (EXPR_LT, 0); } |
|
|
580 ">" { BIN_OP_RETURN (EXPR_GT, 0); } |
|
661
|
581 "+" | |
|
|
582 ".+" { |
|
113
|
583 if (plotting && ! in_plot_range) |
|
|
584 past_plot_range = 1; |
|
143
|
585 BIN_OP_RETURN ('+', 0); |
|
113
|
586 } |
|
661
|
587 "-" | |
|
|
588 ".-" { |
|
113
|
589 if (plotting && ! in_plot_range) |
|
|
590 past_plot_range = 1; |
|
143
|
591 BIN_OP_RETURN ('-', 0); |
|
113
|
592 } |
|
143
|
593 "*" { BIN_OP_RETURN ('*', 0); } |
|
|
594 "/" { BIN_OP_RETURN ('/', 0); } |
|
|
595 "\\" { BIN_OP_RETURN (LEFTDIV, 0); } |
|
|
596 ";" { BIN_OP_RETURN (';', 1); } |
|
|
597 "," { BIN_OP_RETURN (',', 1); } |
|
661
|
598 "**" | |
|
143
|
599 "^" { BIN_OP_RETURN (POW, 0); } |
|
|
600 "=" { BIN_OP_RETURN ('=', 1); } |
|
1
|
601 "(" { |
|
113
|
602 if (plotting && ! in_plot_range) |
|
|
603 past_plot_range = 1; |
|
1
|
604 in_brace_or_paren.push (0); |
|
143
|
605 TOK_RETURN ('('); |
|
1
|
606 } |
|
|
607 ")" { |
|
|
608 if (! in_brace_or_paren.empty ()) |
|
|
609 in_brace_or_paren.pop (); |
|
146
|
610 do_comma_insert_check (); |
|
1
|
611 current_input_column++; |
|
|
612 quote_is_transpose = 1; |
|
611
|
613 convert_spaces_to_comma = (! in_brace_or_paren.empty () |
|
|
614 && in_brace_or_paren.top ()); |
|
1
|
615 return ')'; |
|
|
616 } |
|
|
617 |
|
|
618 . { |
|
|
619 |
|
|
620 // We return everything else as single character tokens, which should |
|
|
621 // eventually result in a parse error. |
|
|
622 |
|
143
|
623 TOK_RETURN (yytext[0]); |
|
1
|
624 } |
|
|
625 |
|
|
626 %% |
|
|
627 |
|
767
|
628 // GAG. |
|
|
629 // |
|
|
630 // If we're reading a matrix and the next character is '[', make sure |
|
|
631 // that we insert a comma ahead of it. |
|
|
632 |
|
146
|
633 void |
|
1
|
634 do_comma_insert_check (void) |
|
|
635 { |
|
|
636 int c = yyinput (); |
|
146
|
637 yyunput (c, yytext); |
|
1
|
638 do_comma_insert = (braceflag && c == '['); |
|
|
639 } |
|
|
640 |
|
767
|
641 // Fix things up for errors or interrupts. The parser is never called |
|
|
642 // recursively, so it is always safe to reinitialize its state before |
|
|
643 // doing any parsing. |
|
|
644 |
|
1
|
645 void |
|
|
646 reset_parser (void) |
|
|
647 { |
|
287
|
648 // Start off on the right foot. |
|
1
|
649 BEGIN 0; |
|
166
|
650 error_state = 0; |
|
287
|
651 |
|
|
652 // We do want a prompt by default. |
|
1
|
653 promptflag = 1; |
|
287
|
654 |
|
|
655 // Not initially screwed by `function [...] = f (...)' syntax. |
|
1
|
656 maybe_screwed = 0; |
|
|
657 maybe_screwed_again = 0; |
|
287
|
658 |
|
|
659 // Not initially inside a loop or if statement. |
|
1
|
660 looping = 0; |
|
|
661 iffing = 0; |
|
287
|
662 |
|
|
663 // Quote marks strings intially. |
|
|
664 quote_is_transpose = 0; |
|
|
665 |
|
|
666 // Next token can be identifier. |
|
|
667 cant_be_identifier = 0; |
|
|
668 |
|
|
669 // No need to do comma insert or convert spaces to comma at beginning |
|
|
670 // of input. |
|
|
671 do_comma_insert = 0; |
|
|
672 convert_spaces_to_comma = 1; |
|
|
673 |
|
|
674 // Not initially defining a function. |
|
|
675 beginning_of_function = 0; |
|
|
676 defining_func = 0; |
|
|
677 |
|
|
678 // Not initially doing any plotting or setting of plot attributes. |
|
|
679 plotting = 0; |
|
|
680 in_plot_range = 0; |
|
|
681 past_plot_range = 0; |
|
|
682 in_plot_using = 0; |
|
|
683 in_plot_style = 0; |
|
|
684 doing_set = 0; |
|
|
685 |
|
747
|
686 // Not initially looking at indirect references. |
|
|
687 looking_at_indirect_ref = 0; |
|
|
688 |
|
287
|
689 // Error may have occurred inside some parentheses or braces. |
|
|
690 in_brace_or_paren.clear (); |
|
|
691 |
|
|
692 // Not initially defining a matrix list. |
|
|
693 braceflag = 0; |
|
1
|
694 ml.clear (); |
|
|
695 mlnm.clear (); |
|
287
|
696 |
|
|
697 // Clear out the stack of token info used to track line and column |
|
|
698 // numbers. |
|
143
|
699 while (! token_stack.empty ()) |
|
|
700 delete token_stack.pop (); |
|
287
|
701 |
|
|
702 // Can be reset by defining a function. |
|
|
703 current_input_column = 1; |
|
373
|
704 if (! reading_script_file) |
|
|
705 input_line_number = current_command_number - 1; |
|
287
|
706 |
|
|
707 // Only ask for input from stdin if we are expecting interactive |
|
|
708 // input. |
|
338
|
709 if (interactive && ! (reading_fcn_file || get_input_from_eval_string)) |
|
287
|
710 yyrestart (stdin); |
|
1
|
711 } |
|
|
712 |
|
767
|
713 // Replace backslash escapes in a string with the real values. |
|
|
714 |
|
1
|
715 static void |
|
|
716 do_string_escapes (char *s) |
|
|
717 { |
|
|
718 char *p1 = s; |
|
|
719 char *p2 = s; |
|
|
720 while (*p2 != '\0') |
|
|
721 { |
|
|
722 if (*p2 == '\\' && *(p2+1) != '\0') |
|
|
723 { |
|
|
724 switch (*++p2) |
|
|
725 { |
|
|
726 case 'a': |
|
|
727 *p1 = '\a'; |
|
|
728 break; |
|
|
729 case 'b': // backspace |
|
|
730 *p1 = '\b'; |
|
|
731 break; |
|
|
732 case 'f': // formfeed |
|
|
733 *p1 = '\f'; |
|
|
734 break; |
|
|
735 case 'n': // newline |
|
|
736 *p1 = '\n'; |
|
|
737 break; |
|
|
738 case 'r': // carriage return |
|
|
739 *p1 = '\r'; |
|
|
740 break; |
|
|
741 case 't': // horizontal tab |
|
|
742 *p1 = '\t'; |
|
|
743 break; |
|
|
744 case 'v': // vertical tab |
|
|
745 *p1 = '\v'; |
|
|
746 break; |
|
|
747 case '\\': // backslash |
|
|
748 *p1 = '\\'; |
|
|
749 break; |
|
|
750 case '\'': // quote |
|
|
751 *p1 = '\''; |
|
|
752 break; |
|
|
753 case '"': // double quote |
|
|
754 *p1 = '"'; |
|
|
755 break; |
|
|
756 default: |
|
|
757 warning ("unrecognized escape sequence `\\%c' -- converting to `%c'", |
|
|
758 *p2, *p2); |
|
|
759 *p1 = *p2; |
|
|
760 break; |
|
|
761 } |
|
|
762 } |
|
|
763 else if (*p2 == '\'' && *(p2+1) == '\'') |
|
|
764 { |
|
|
765 *p1 = '\''; |
|
|
766 p2++; |
|
|
767 } |
|
|
768 else |
|
|
769 { |
|
|
770 *p1 = *p2; |
|
|
771 } |
|
|
772 |
|
|
773 p1++; |
|
|
774 p2++; |
|
|
775 } |
|
|
776 |
|
|
777 *p1 = '\0'; |
|
|
778 } |
|
|
779 |
|
767
|
780 // If we read some newlines, we need figure out what column we're |
|
|
781 // really looking at. |
|
|
782 |
|
1
|
783 static void |
|
|
784 fixup_column_count (char *s) |
|
|
785 { |
|
|
786 char c; |
|
|
787 while ((c = *s++) != '\0') |
|
|
788 { |
|
|
789 if (c == '\n') |
|
143
|
790 current_input_column = 1; |
|
1
|
791 else |
|
|
792 current_input_column++; |
|
|
793 } |
|
|
794 } |
|
|
795 |
|
767
|
796 // Include these so that we don't have to link to libfl.a. |
|
246
|
797 |
|
1
|
798 #ifdef yywrap |
|
|
799 #undef yywrap |
|
|
800 #endif |
|
246
|
801 static int |
|
1
|
802 yywrap (void) |
|
|
803 { |
|
287
|
804 return 1; |
|
1
|
805 } |
|
|
806 |
|
767
|
807 // These are not needed with flex-2.4.6, but may be needed with |
|
|
808 // earlier 2.4.x versions. |
|
|
809 |
|
287
|
810 #if 0 |
|
246
|
811 static void * |
|
|
812 yy_flex_alloc (int size) |
|
|
813 { |
|
|
814 return (void *) malloc ((unsigned) size); |
|
|
815 } |
|
|
816 |
|
|
817 static void * |
|
|
818 yy_flex_realloc (void *ptr, int size) |
|
|
819 { |
|
|
820 return (void *) realloc (ptr, (unsigned) size); |
|
|
821 } |
|
|
822 |
|
|
823 static void |
|
|
824 yy_flex_free (void *ptr) |
|
|
825 { |
|
|
826 free (ptr); |
|
|
827 } |
|
287
|
828 #endif |
|
246
|
829 |
|
767
|
830 // Tell us all what the current buffer is. |
|
|
831 |
|
1
|
832 YY_BUFFER_STATE |
|
|
833 current_buffer (void) |
|
|
834 { |
|
|
835 return YY_CURRENT_BUFFER; |
|
|
836 } |
|
|
837 |
|
767
|
838 // Create a new buffer. |
|
|
839 |
|
1
|
840 YY_BUFFER_STATE |
|
|
841 create_buffer (FILE *f) |
|
|
842 { |
|
|
843 return yy_create_buffer (f, YY_BUF_SIZE); |
|
|
844 } |
|
|
845 |
|
767
|
846 // Start reading a new buffer. |
|
|
847 |
|
1
|
848 void |
|
|
849 switch_to_buffer (YY_BUFFER_STATE buf) |
|
|
850 { |
|
|
851 yy_switch_to_buffer (buf); |
|
|
852 } |
|
|
853 |
|
767
|
854 // Delete a buffer. |
|
|
855 |
|
1
|
856 void |
|
|
857 delete_buffer (YY_BUFFER_STATE buf) |
|
|
858 { |
|
|
859 yy_delete_buffer (buf); |
|
|
860 } |
|
|
861 |
|
767
|
862 // Restore a buffer (for unwind-prot). |
|
|
863 |
|
1
|
864 void |
|
|
865 restore_input_buffer (void *buf) |
|
|
866 { |
|
|
867 switch_to_buffer ((YY_BUFFER_STATE) buf); |
|
|
868 } |
|
|
869 |
|
767
|
870 // Delete a buffer (for unwind-prot). |
|
|
871 |
|
1
|
872 void |
|
|
873 delete_input_buffer (void *buf) |
|
|
874 { |
|
|
875 delete_buffer ((YY_BUFFER_STATE) buf); |
|
|
876 } |
|
|
877 |
|
767
|
878 // Check to see if a character string matches any of the possible line |
|
|
879 // styles for plots. |
|
|
880 |
|
1
|
881 static char * |
|
|
882 plot_style_token (char *s) |
|
|
883 { |
|
146
|
884 static char *plot_styles[] = |
|
|
885 { |
|
|
886 "dots", |
|
|
887 "errorbars", |
|
|
888 "impulses", |
|
|
889 "lines", |
|
|
890 "linespoints", |
|
|
891 "points", |
|
522
|
892 0, |
|
146
|
893 }; |
|
|
894 |
|
1
|
895 char **tmp = plot_styles; |
|
522
|
896 while (*tmp) |
|
1
|
897 { |
|
|
898 if (almost_match (*tmp, s)) |
|
|
899 return *tmp; |
|
|
900 |
|
|
901 tmp++; |
|
|
902 } |
|
|
903 |
|
522
|
904 return 0; |
|
1
|
905 } |
|
|
906 |
|
767
|
907 // Check to see if a character string matches any one of the plot |
|
|
908 // option keywords. |
|
|
909 |
|
1
|
910 static int |
|
|
911 is_plot_keyword (char *s) |
|
|
912 { |
|
|
913 if (almost_match ("title", s)) |
|
146
|
914 { |
|
|
915 return TITLE; |
|
|
916 } |
|
1
|
917 else if (almost_match ("using", s)) |
|
146
|
918 { |
|
|
919 in_plot_using = 1; |
|
|
920 past_plot_range = 1; |
|
|
921 return USING; |
|
|
922 } |
|
1
|
923 else if (almost_match ("with", s)) |
|
146
|
924 { |
|
|
925 in_plot_style = 1; |
|
|
926 past_plot_range = 1; |
|
|
927 return WITH; |
|
|
928 } |
|
1
|
929 else |
|
146
|
930 { |
|
|
931 return 0; |
|
|
932 } |
|
1
|
933 } |
|
|
934 |
|
767
|
935 // Handle keywords. Could probably be more efficient... |
|
|
936 |
|
1
|
937 static int |
|
|
938 is_keyword (char *s) |
|
|
939 { |
|
|
940 if (plotting && in_plot_style) |
|
|
941 { |
|
|
942 char *sty = plot_style_token (s); |
|
522
|
943 if (sty) |
|
1
|
944 { |
|
|
945 in_plot_style = 0; |
|
143
|
946 yylval.tok_val = new token (sty); |
|
|
947 token_stack.push (yylval.tok_val); |
|
1
|
948 return STYLE; |
|
|
949 } |
|
|
950 } |
|
|
951 |
|
143
|
952 int l = input_line_number; |
|
|
953 int c = current_input_column; |
|
|
954 |
|
1
|
955 int end_found = 0; |
|
|
956 if (strcmp ("break", s) == 0) |
|
143
|
957 { |
|
191
|
958 yylval.tok_val = new token (l, c); |
|
|
959 token_stack.push (yylval.tok_val); |
|
143
|
960 return BREAK; |
|
|
961 } |
|
1
|
962 else if (strcmp ("continue", s) == 0) |
|
143
|
963 { |
|
191
|
964 yylval.tok_val = new token (l, c); |
|
|
965 token_stack.push (yylval.tok_val); |
|
143
|
966 return CONTINUE; |
|
|
967 } |
|
1
|
968 else if (strcmp ("else", s) == 0) |
|
143
|
969 { |
|
191
|
970 yylval.tok_val = new token (l, c); |
|
|
971 token_stack.push (yylval.tok_val); |
|
143
|
972 return ELSE; |
|
|
973 } |
|
1
|
974 else if (strcmp ("elseif", s) == 0) |
|
143
|
975 { |
|
191
|
976 yylval.tok_val = new token (l, c); |
|
|
977 token_stack.push (yylval.tok_val); |
|
143
|
978 return ELSEIF; |
|
|
979 } |
|
1
|
980 else if (strcmp ("end", s) == 0) |
|
143
|
981 { |
|
|
982 end_found = 1; |
|
|
983 yylval.tok_val = new token (token::simple_end, l, c); |
|
|
984 token_stack.push (yylval.tok_val); |
|
|
985 } |
|
1
|
986 else if (strcmp ("endfor", s) == 0) |
|
143
|
987 { |
|
|
988 end_found = 1; |
|
|
989 yylval.tok_val = new token (token::for_end, l, c); |
|
|
990 token_stack.push (yylval.tok_val); |
|
|
991 } |
|
1
|
992 else if (strcmp ("endfunction", s) == 0) |
|
143
|
993 { |
|
|
994 end_found = 1; |
|
|
995 yylval.tok_val = new token (token::function_end, l, c); |
|
|
996 token_stack.push (yylval.tok_val); |
|
|
997 } |
|
1
|
998 else if (strcmp ("endif", s) == 0) |
|
143
|
999 { |
|
|
1000 end_found = 1; |
|
|
1001 yylval.tok_val = new token (token::if_end, l, c); |
|
|
1002 token_stack.push (yylval.tok_val); |
|
|
1003 } |
|
1
|
1004 else if (strcmp ("endwhile", s) == 0) |
|
143
|
1005 { |
|
|
1006 end_found = 1; |
|
|
1007 yylval.tok_val = new token (token::while_end, l, c); |
|
|
1008 token_stack.push (yylval.tok_val); |
|
|
1009 } |
|
1
|
1010 else if (strcmp ("for", s) == 0) |
|
143
|
1011 { |
|
|
1012 promptflag--; |
|
|
1013 looping++; |
|
191
|
1014 yylval.tok_val = new token (l, c); |
|
|
1015 token_stack.push (yylval.tok_val); |
|
143
|
1016 return FOR; |
|
|
1017 } |
|
1
|
1018 else if (strcmp ("function", s) == 0) |
|
|
1019 { |
|
|
1020 if (defining_func) |
|
|
1021 { |
|
191
|
1022 error ("function keyword invalid within a function body"); |
|
|
1023 |
|
338
|
1024 if ((reading_fcn_file || reading_script_file) |
|
522
|
1025 && curr_fcn_file_name) |
|
341
|
1026 error ("defining new function near line %d of file `%s.m'", |
|
|
1027 input_line_number, curr_fcn_file_name); |
|
191
|
1028 else |
|
|
1029 error ("defining new function near line %d", input_line_number); |
|
|
1030 |
|
627
|
1031 return LEXICAL_ERROR; |
|
1
|
1032 } |
|
|
1033 else |
|
|
1034 { |
|
|
1035 tmp_local_sym_tab = new symbol_table (); |
|
|
1036 curr_sym_tab = tmp_local_sym_tab; |
|
|
1037 defining_func = 1; |
|
|
1038 promptflag--; |
|
|
1039 beginning_of_function = 1; |
|
|
1040 help_buf[0] = '\0'; |
|
143
|
1041 input_line_number = 1; |
|
1
|
1042 return FCN; |
|
|
1043 } |
|
|
1044 } |
|
|
1045 else if (strcmp ("global", s) == 0) |
|
143
|
1046 { |
|
578
|
1047 yylval.tok_val = new token (l, c); |
|
|
1048 token_stack.push (yylval.tok_val); |
|
143
|
1049 return GLOBAL; |
|
|
1050 } |
|
1
|
1051 else if (strcmp ("gplot", s) == 0) |
|
143
|
1052 { |
|
|
1053 plotting = 1; |
|
|
1054 yylval.tok_val = new token (token::two_dee, l, c); |
|
476
|
1055 token_stack.push (yylval.tok_val); |
|
143
|
1056 return PLOT; |
|
|
1057 } |
|
1
|
1058 else if (strcmp ("gsplot", s) == 0) |
|
143
|
1059 { |
|
|
1060 plotting = 1; |
|
|
1061 yylval.tok_val = new token (token::three_dee, l, c); |
|
|
1062 token_stack.push (yylval.tok_val); |
|
|
1063 return PLOT; |
|
|
1064 } |
|
476
|
1065 else if (strcmp ("replot", s) == 0) |
|
|
1066 { |
|
|
1067 plotting = 1; |
|
|
1068 yylval.tok_val = new token (token::replot, l, c); |
|
|
1069 token_stack.push (yylval.tok_val); |
|
|
1070 return PLOT; |
|
|
1071 } |
|
1
|
1072 else if (strcmp ("if", s) == 0) |
|
143
|
1073 { |
|
|
1074 iffing++; |
|
|
1075 promptflag--; |
|
191
|
1076 yylval.tok_val = new token (l, c); |
|
|
1077 token_stack.push (yylval.tok_val); |
|
143
|
1078 return IF; |
|
|
1079 } |
|
1
|
1080 else if (strcmp ("return", s) == 0) |
|
143
|
1081 { |
|
191
|
1082 yylval.tok_val = new token (l, c); |
|
|
1083 token_stack.push (yylval.tok_val); |
|
143
|
1084 return FUNC_RET; |
|
|
1085 } |
|
1
|
1086 else if (strcmp ("while", s) == 0) |
|
143
|
1087 { |
|
|
1088 promptflag--; |
|
|
1089 looping++; |
|
191
|
1090 yylval.tok_val = new token (l, c); |
|
|
1091 token_stack.push (yylval.tok_val); |
|
143
|
1092 return WHILE; |
|
|
1093 } |
|
1
|
1094 |
|
|
1095 if (end_found) |
|
|
1096 { |
|
143
|
1097 if (! defining_func && ! looping) |
|
1
|
1098 promptflag++; |
|
|
1099 return END; |
|
|
1100 } |
|
|
1101 |
|
|
1102 return 0; |
|
|
1103 } |
|
|
1104 |
|
767
|
1105 // Try to find an identifier. All binding to global or builtin |
|
|
1106 // variables occurs when expressions are evaluated. |
|
|
1107 |
|
1
|
1108 static symbol_record * |
|
|
1109 lookup_identifier (char *name) |
|
|
1110 { |
|
|
1111 return curr_sym_tab->lookup (name, 1, 0); |
|
|
1112 } |
|
|
1113 |
|
767
|
1114 // Grab the help text from an function file. |
|
|
1115 |
|
1
|
1116 static void |
|
|
1117 grab_help_text (void) |
|
|
1118 { |
|
|
1119 int max_len = HELP_BUF_LENGTH - 1; |
|
|
1120 |
|
|
1121 int in_comment = 1; |
|
|
1122 int len = 0; |
|
576
|
1123 int c = 0; |
|
1
|
1124 |
|
|
1125 while ((c = yyinput ()) != EOF) |
|
|
1126 { |
|
|
1127 if (in_comment) |
|
|
1128 { |
|
|
1129 help_buf[len++] = c; |
|
|
1130 if (c == '\n') |
|
|
1131 in_comment = 0; |
|
|
1132 } |
|
|
1133 else |
|
|
1134 { |
|
|
1135 switch (c) |
|
|
1136 { |
|
|
1137 case '%': |
|
|
1138 case '#': |
|
|
1139 in_comment = 1; |
|
|
1140 case ' ': |
|
|
1141 case '\t': |
|
446
|
1142 break; |
|
440
|
1143 default: |
|
446
|
1144 goto done; |
|
1
|
1145 } |
|
|
1146 } |
|
|
1147 |
|
|
1148 if (len > max_len) |
|
|
1149 { |
|
216
|
1150 warning ("grab_help_text: buffer overflow after caching %d chars", |
|
1
|
1151 max_len); |
|
440
|
1152 break; |
|
1
|
1153 } |
|
|
1154 } |
|
|
1155 |
|
446
|
1156 done: |
|
|
1157 |
|
576
|
1158 if (c) |
|
|
1159 yyunput (c, yytext); |
|
|
1160 |
|
1
|
1161 help_buf[len] = '\0'; |
|
|
1162 } |
|
|
1163 |
|
767
|
1164 // Return 1 if the given character matches any character in the given |
|
|
1165 // string. |
|
|
1166 |
|
1
|
1167 static int |
|
|
1168 match_any (char c, char *s) |
|
|
1169 { |
|
|
1170 char tmp; |
|
|
1171 while ((tmp = *s++) != '\0') |
|
|
1172 { |
|
|
1173 if (c == tmp) |
|
|
1174 return 1; |
|
|
1175 } |
|
|
1176 return 0; |
|
|
1177 } |
|
|
1178 |
|
767
|
1179 // Given information about the spacing surrounding an operator, |
|
|
1180 // return 1 if it looks like it should be treated as a binary |
|
|
1181 // operator. For example, |
|
|
1182 // |
|
|
1183 // [ 1 + 2 ] or [ 1+ 2] or [ 1+2 ] ==> binary |
|
|
1184 |
|
1
|
1185 static int |
|
|
1186 looks_like_bin_op (int spc_prev, int spc_next) |
|
|
1187 { |
|
608
|
1188 return ((spc_prev && spc_next) || ! spc_prev); |
|
1
|
1189 } |
|
|
1190 |
|
767
|
1191 // Duh. |
|
|
1192 |
|
1
|
1193 static int |
|
|
1194 next_char_is_space (void) |
|
|
1195 { |
|
|
1196 int c = yyinput (); |
|
|
1197 yyunput (c, yytext); |
|
|
1198 return (c == ' ' || c == '\t'); |
|
|
1199 } |
|
|
1200 |
|
767
|
1201 // Try to determine if the next token should be treated as a postfix |
|
|
1202 // unary operator. This is ugly, but it seems to do the right thing. |
|
|
1203 |
|
1
|
1204 static int |
|
|
1205 next_token_is_postfix_unary_op (int spc_prev, char *yytext) |
|
|
1206 { |
|
|
1207 int un_op = 0; |
|
|
1208 |
|
|
1209 int c0 = yyinput (); |
|
|
1210 int c1 = yyinput (); |
|
|
1211 |
|
|
1212 yyunput (c1, yytext); |
|
|
1213 yyunput (c0, yytext); |
|
|
1214 |
|
|
1215 int transpose = (c0 == '.' && c1 == '\''); |
|
|
1216 int hermitian = (c0 == '\''); |
|
|
1217 |
|
|
1218 un_op = (transpose || (hermitian && ! spc_prev)); |
|
|
1219 |
|
|
1220 return un_op; |
|
|
1221 } |
|
|
1222 |
|
767
|
1223 // Try to determine if the next token should be treated as a binary |
|
|
1224 // operator. This is even uglier, but it also seems to do the right |
|
|
1225 // thing. |
|
|
1226 |
|
1
|
1227 static int |
|
|
1228 next_token_is_bin_op (int spc_prev, char *yytext) |
|
|
1229 { |
|
|
1230 int bin_op = 0; |
|
|
1231 int spc_next = 0; |
|
|
1232 |
|
|
1233 int c0 = yyinput (); |
|
|
1234 int c1 = yyinput (); |
|
|
1235 |
|
|
1236 switch (c0) |
|
|
1237 { |
|
|
1238 case '+': case '-': case '/': |
|
|
1239 case ':': case '\\': case '^': |
|
|
1240 spc_next = (c1 == ' ' || c1 == '\t'); |
|
|
1241 break; |
|
|
1242 |
|
|
1243 case '&': |
|
|
1244 if (c1 == '&') |
|
|
1245 spc_next = next_char_is_space (); |
|
|
1246 else |
|
|
1247 spc_next = (c1 == ' ' || c1 == '\t'); |
|
|
1248 break; |
|
|
1249 |
|
|
1250 case '*': |
|
|
1251 if (c1 == '*') |
|
|
1252 spc_next = next_char_is_space (); |
|
|
1253 else |
|
|
1254 spc_next = (c1 == ' ' || c1 == '\t'); |
|
|
1255 break; |
|
|
1256 |
|
|
1257 case '|': |
|
|
1258 if (c1 == '|') |
|
|
1259 spc_next = next_char_is_space (); |
|
|
1260 else |
|
|
1261 spc_next = (c1 == ' ' || c1 == '\t'); |
|
|
1262 break; |
|
|
1263 |
|
|
1264 case '<': |
|
|
1265 if (c1 == '=' || c1 == '>') |
|
|
1266 spc_next = next_char_is_space (); |
|
|
1267 else |
|
|
1268 spc_next = (c1 == ' ' || c1 == '\t'); |
|
|
1269 break; |
|
|
1270 |
|
|
1271 case '>': |
|
|
1272 if (c1 == '=') |
|
|
1273 spc_next = next_char_is_space (); |
|
|
1274 else |
|
|
1275 spc_next = (c1 == ' ' || c1 == '\t'); |
|
|
1276 break; |
|
|
1277 |
|
|
1278 case '~': case '!': case '=': |
|
|
1279 if (c1 == '=') |
|
|
1280 spc_next = next_char_is_space (); |
|
|
1281 else |
|
|
1282 goto done; |
|
|
1283 break; |
|
|
1284 |
|
|
1285 case '.': |
|
|
1286 if (c1 == '*') |
|
|
1287 { |
|
|
1288 int c2 = yyinput (); |
|
|
1289 if (c2 == '*') |
|
|
1290 spc_next = next_char_is_space (); |
|
|
1291 else |
|
|
1292 spc_next = (c2 == ' ' || c2 == '\t'); |
|
|
1293 yyunput (c2, yytext); |
|
|
1294 } |
|
|
1295 else if (c1 == '/' || c1 == '\\' || c1 == '^') |
|
|
1296 spc_next = next_char_is_space (); |
|
|
1297 else |
|
|
1298 goto done; |
|
|
1299 break; |
|
|
1300 |
|
|
1301 default: |
|
|
1302 goto done; |
|
|
1303 } |
|
|
1304 |
|
|
1305 bin_op = looks_like_bin_op (spc_prev, spc_next); |
|
|
1306 |
|
|
1307 done: |
|
|
1308 yyunput (c1, yytext); |
|
|
1309 yyunput (c0, yytext); |
|
|
1310 |
|
|
1311 return bin_op; |
|
|
1312 } |
|
|
1313 |
|
767
|
1314 // Used to delete trailing white space from tokens. |
|
|
1315 |
|
146
|
1316 static char * |
|
1
|
1317 strip_trailing_whitespace (char *s) |
|
|
1318 { |
|
|
1319 char *retval = strsave (s); |
|
|
1320 |
|
|
1321 char *t = strchr (retval, ' '); |
|
522
|
1322 if (t) |
|
1
|
1323 *t = '\0'; |
|
|
1324 |
|
|
1325 t = strchr (retval, '\t'); |
|
522
|
1326 if (t) |
|
1
|
1327 *t = '\0'; |
|
|
1328 |
|
|
1329 return retval; |
|
|
1330 } |
|
|
1331 |
|
767
|
1332 // Figure out exactly what kind of token to return when we have seen |
|
|
1333 // an identifier. Handles keywords. |
|
|
1334 |
|
146
|
1335 static int |
|
|
1336 handle_identifier (char *tok, int next_tok_is_eq) |
|
|
1337 { |
|
747
|
1338 // If we are expecting a structure element, we just want to return |
|
|
1339 // TEXT_ID, which is a string that is also a valid identifier. |
|
|
1340 |
|
|
1341 if (looking_at_indirect_ref) |
|
|
1342 { |
|
|
1343 yylval.tok_val = new token (tok); |
|
|
1344 token_stack.push (yylval.tok_val); |
|
|
1345 TOK_RETURN (TEXT_ID); |
|
|
1346 } |
|
|
1347 |
|
146
|
1348 // If we have a regular keyword, or a plot STYLE, return it. STYLE is |
|
|
1349 // special only because it can't be followed by an identifier. |
|
|
1350 |
|
|
1351 int kw_token = is_keyword (tok); |
|
|
1352 if (kw_token) |
|
|
1353 { |
|
|
1354 if (kw_token == STYLE) |
|
|
1355 { |
|
|
1356 current_input_column += yyleng; |
|
|
1357 quote_is_transpose = 0; |
|
|
1358 cant_be_identifier = 1; |
|
|
1359 convert_spaces_to_comma = 1; |
|
|
1360 return kw_token; |
|
|
1361 } |
|
|
1362 else |
|
|
1363 TOK_RETURN (kw_token); |
|
|
1364 } |
|
|
1365 |
|
|
1366 // See if we have a plot keyword (title, using, or with). |
|
|
1367 |
|
148
|
1368 int plot_option_kw = is_plot_keyword (tok); |
|
|
1369 if (plotting && cant_be_identifier && plot_option_kw) |
|
146
|
1370 TOK_RETURN (plot_option_kw); |
|
|
1371 |
|
|
1372 // Yes, we really do need both of these plot_range variables. One |
|
|
1373 // is used to mark when we are past all possiblity of a plot range, |
|
|
1374 // the other is used to mark when we are actually between the square |
|
|
1375 // brackets that surround the range. |
|
|
1376 |
|
|
1377 if (plotting && ! in_plot_range) |
|
|
1378 past_plot_range = 1; |
|
|
1379 |
|
|
1380 // It is always an error for an identifier to be followed directly by |
|
|
1381 // another identifier. |
|
|
1382 |
|
|
1383 cant_be_identifier = 1; |
|
|
1384 |
|
|
1385 // If we are looking at a text style function, set up to gobble its |
|
|
1386 // arguments. These are also reserved words, but only because it |
|
|
1387 // would be very difficult to do anything intelligent with them if |
|
|
1388 // they were not reserved. |
|
|
1389 |
|
|
1390 if (is_text_function_name (tok)) |
|
|
1391 { |
|
|
1392 BEGIN TEXT_FCN; |
|
|
1393 |
|
169
|
1394 if (strcmp (tok, "help") == 0) |
|
146
|
1395 BEGIN HELP_FCN; |
|
|
1396 else if (strcmp (tok, "set") == 0) |
|
|
1397 doing_set = 1; |
|
|
1398 } |
|
|
1399 |
|
|
1400 // Make sure we put the return values of a function in the symbol |
|
|
1401 // table that is local to the function. |
|
|
1402 |
|
|
1403 if (next_tok_is_eq && defining_func && maybe_screwed) |
|
|
1404 curr_sym_tab = tmp_local_sym_tab; |
|
|
1405 |
|
|
1406 // Find the token in the symbol table. |
|
|
1407 |
|
|
1408 yylval.tok_val = new token (lookup_identifier (tok), |
|
|
1409 input_line_number, |
|
|
1410 current_input_column); |
|
|
1411 |
|
|
1412 token_stack.push (yylval.tok_val); |
|
|
1413 |
|
|
1414 // After seeing an identifer, it is ok to convert spaces to a comma |
|
|
1415 // (if needed). |
|
|
1416 |
|
|
1417 convert_spaces_to_comma = 1; |
|
|
1418 current_input_column += yyleng; |
|
|
1419 |
|
|
1420 // If we are defining a function and we have not seen the parameter |
|
|
1421 // list yet and the next token is `=', return a token that represents |
|
|
1422 // the only return value for the function. For example, |
|
|
1423 // |
|
|
1424 // function SCREW = f (args); |
|
|
1425 // |
|
|
1426 // The variable maybe_screwed is reset in parse.y. |
|
|
1427 |
|
|
1428 if (next_tok_is_eq) |
|
|
1429 { |
|
|
1430 if (defining_func && maybe_screwed) |
|
|
1431 return SCREW; |
|
|
1432 else |
|
|
1433 return NAME; |
|
|
1434 } |
|
|
1435 |
|
|
1436 // At this point, we are only dealing with identifiers that are not |
|
|
1437 // followed by `=' (if the next token is `=', there is no need to |
|
|
1438 // check to see if we should insert a comma (invalid syntax), or allow |
|
|
1439 // a following `'' to be treated as a transpose (the next token is |
|
|
1440 // `=', so it can't be `''. |
|
|
1441 |
|
|
1442 quote_is_transpose = 1; |
|
|
1443 do_comma_insert_check (); |
|
|
1444 |
|
|
1445 // Check to see if we should insert a comma. |
|
|
1446 |
|
430
|
1447 if (user_pref.commas_in_literal_matrix != 2 |
|
|
1448 && ! in_brace_or_paren.empty () |
|
|
1449 && in_brace_or_paren.top ()) |
|
146
|
1450 { |
|
|
1451 int c0 = yytext[yyleng-1]; |
|
|
1452 int spc_prev = (c0 == ' ' || c0 == '\t'); |
|
|
1453 int bin_op = next_token_is_bin_op (spc_prev, yytext); |
|
|
1454 |
|
|
1455 int postfix_un_op = next_token_is_postfix_unary_op (spc_prev, |
|
|
1456 yytext); |
|
|
1457 |
|
|
1458 int c1 = yyinput (); |
|
|
1459 unput (c1); |
|
747
|
1460 int other_op = match_any (c1, ".,;\n]"); |
|
430
|
1461 int index_op = (c1 == '(' |
|
|
1462 && (user_pref.commas_in_literal_matrix == 0 |
|
|
1463 || ! spc_prev)); |
|
412
|
1464 |
|
|
1465 if (! (postfix_un_op || bin_op || other_op || index_op)) |
|
430
|
1466 unput (','); |
|
146
|
1467 } |
|
|
1468 |
|
|
1469 return NAME; |
|
|
1470 } |
|
|
1471 |
|
767
|
1472 // Print a warning if a function file that defines a function has |
|
|
1473 // anything other than comments and whitespace following the END token |
|
|
1474 // that matches the FUNCTION statement. |
|
|
1475 |
|
1
|
1476 void |
|
|
1477 check_for_garbage_after_fcn_def (void) |
|
|
1478 { |
|
|
1479 // By making a newline be the next character to be read, we will force |
|
|
1480 // the parser to return after reading the function. Calling yyunput |
|
|
1481 // with EOF seems not to work... |
|
|
1482 |
|
|
1483 int in_comment = 0; |
|
|
1484 int lineno = input_line_number; |
|
|
1485 int c; |
|
|
1486 while ((c = yyinput ()) != EOF) |
|
|
1487 { |
|
|
1488 switch (c) |
|
|
1489 { |
|
|
1490 case ' ': |
|
|
1491 case '\t': |
|
|
1492 case ';': |
|
|
1493 case ',': |
|
|
1494 break; |
|
|
1495 case '\n': |
|
|
1496 if (in_comment) |
|
|
1497 in_comment = 0; |
|
|
1498 break; |
|
|
1499 case '%': |
|
|
1500 case '#': |
|
|
1501 in_comment = 1; |
|
|
1502 break; |
|
|
1503 default: |
|
|
1504 if (in_comment) |
|
|
1505 break; |
|
|
1506 else |
|
|
1507 { |
|
|
1508 warning ("ignoring trailing garbage after end of function\n\ |
|
341
|
1509 near line %d of file `%s.m'", lineno, curr_fcn_file_name); |
|
1
|
1510 |
|
|
1511 yyunput ('\n', yytext); |
|
|
1512 return; |
|
|
1513 } |
|
|
1514 } |
|
|
1515 } |
|
|
1516 yyunput ('\n', yytext); |
|
|
1517 } |
|
|
1518 |
|
767
|
1519 /* |
|
|
1520 |
|
|
1521 Maybe someday... |
|
1
|
1522 |
|
|
1523 "+=" return ADD_EQ; |
|
|
1524 "-=" return SUB_EQ; |
|
|
1525 "*=" return MUL_EQ; |
|
|
1526 "/=" return DIV_EQ; |
|
|
1527 "\\=" return LEFTDIV_EQ; |
|
|
1528 ".+=" return ADD_EQ; |
|
|
1529 ".-=" return SUB_EQ; |
|
|
1530 ".*=" return EMUL_EQ; |
|
|
1531 "./=" return EDIV_EQ; |
|
|
1532 ".\\=" return ELEFTDIV_EQ; |
|
|
1533 |
|
|
1534 */ |
