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