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1 /* |
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3 Copyright (C) 1996, 1997 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 Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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383
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23 #if !defined (octave_lex_h) |
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24 #define octave_lex_h 1 |
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25 |
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143
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26 // Arrange to get input via readline. |
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27 |
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28 #ifdef YY_INPUT |
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29 #undef YY_INPUT |
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247
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30 #endif |
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31 #define YY_INPUT(buf, result, max_size) \ |
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32 if ((result = octave_read (buf, max_size)) < 0) \ |
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33 YY_FATAL_ERROR ("octave_read () in flex scanner failed"); |
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34 |
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35 // Try to avoid crashing out completely on fatal scanner errors. |
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36 |
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37 #ifdef YY_FATAL_ERROR |
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38 #undef YY_FATAL_ERROR |
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247
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39 #endif |
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143
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40 #define YY_FATAL_ERROR(msg) \ |
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41 do \ |
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42 { \ |
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43 error (msg); \ |
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44 jump_to_top_level (); \ |
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45 } \ |
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46 while (0) |
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47 |
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48 #define TOK_RETURN(tok) \ |
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49 do \ |
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50 { \ |
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51 current_input_column += yyleng; \ |
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52 lexer_flags.quote_is_transpose = false; \ |
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53 lexer_flags.cant_be_identifier = false; \ |
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54 lexer_flags.convert_spaces_to_comma = true; \ |
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55 return (tok); \ |
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56 } \ |
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57 while (0) |
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58 |
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59 #define TOK_PUSH_AND_RETURN(name, tok) \ |
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60 do \ |
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61 { \ |
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62 yylval.tok_val = new token (name, input_line_number, \ |
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63 current_input_column); \ |
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64 token_stack.push (yylval.tok_val); \ |
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65 TOK_RETURN (tok); \ |
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66 } \ |
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67 while (0) |
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68 |
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69 #define BIN_OP_RETURN(tok, convert) \ |
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70 do \ |
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71 { \ |
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72 yylval.tok_val = new token (input_line_number, current_input_column); \ |
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73 token_stack.push (yylval.tok_val); \ |
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74 current_input_column += yyleng; \ |
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75 lexer_flags.quote_is_transpose = false; \ |
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76 lexer_flags.cant_be_identifier = true; \ |
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77 lexer_flags.convert_spaces_to_comma = convert; \ |
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78 return (tok); \ |
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79 } \ |
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80 while (0) |
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81 |
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82 // XXX FIXME XXX -- these input buffer things should be members of an |
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83 // parser input stream class. |
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84 |
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85 typedef struct yy_buffer_state *YY_BUFFER_STATE; |
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86 |
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87 // Associate a buffer with a new file to read. |
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88 extern YY_BUFFER_STATE create_buffer (FILE *f); |
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89 |
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90 // Report the current buffer. |
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91 extern YY_BUFFER_STATE current_buffer (void); |
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92 |
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93 // Connect to new buffer buffer. |
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94 extern void switch_to_buffer (YY_BUFFER_STATE buf); |
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95 |
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96 // Delete a buffer. |
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97 extern void delete_buffer (YY_BUFFER_STATE buf); |
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98 |
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99 // Restore a buffer (for unwind-prot). |
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100 extern void restore_input_buffer (void *buf); |
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101 |
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102 // Delete a buffer (for unwind-prot). |
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103 extern void delete_input_buffer (void *buf); |
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104 |
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105 // See if a function file has extra garbage after the end statement. |
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106 // This needs to be defined in lex.l so that it can use yyinput() but |
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107 // it must be called from parse.y. |
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108 extern void check_for_garbage_after_fcn_def (void); |
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109 |
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110 // For communication between the lexer and parser. |
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111 |
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112 class lexical_feedback |
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113 { |
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114 public: |
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115 |
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116 lexical_feedback (void) { init (); } |
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117 |
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118 ~lexical_feedback (void) { } |
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119 |
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120 void init (void); |
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121 |
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122 // Brace level count. |
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123 int braceflag; |
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124 |
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125 // Nonzero means we're in the middle of defining a loop. |
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126 int looping; |
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127 |
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128 // Nonzero means we think we are looking at the beginning of a |
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129 // function definition. |
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130 bool beginning_of_function; |
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131 |
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132 // Another context hack, this time for the plot command's `using', |
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133 // `title', and `with' keywords. |
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134 bool cant_be_identifier; |
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135 |
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136 // Nonzero means that we should convert spaces to a comma inside a |
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137 // matrix definition. |
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138 bool convert_spaces_to_comma; |
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139 |
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140 // Nonzero means we're in the middle of defining a function. |
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141 bool defining_func; |
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142 |
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143 // Nonzero means we're parsing the return list for a function. |
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144 bool looking_at_return_list; |
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145 |
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146 // Nonzero means we're parsing the parameter list for a function. |
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147 bool looking_at_parameter_list; |
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148 |
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149 // GAG. Stupid kludge so that [[1,2][3,4]] will work. |
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150 bool do_comma_insert; |
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151 |
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152 // Nonzero means we think we are looking at a set command. |
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153 bool doing_set; |
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154 |
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155 // Nonzero means we're looking at the range part of a plot command. |
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156 bool in_plot_range; |
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157 |
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158 // Nonzero means we're looking at the using part of a plot command. |
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159 bool in_plot_using; |
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160 |
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161 // Nonzero means we're looking at the style part of a plot command. |
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162 bool in_plot_style; |
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163 |
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164 // Nonzero means we're looking at an indirect reference to a |
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165 // structure element. |
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166 bool looking_at_indirect_ref; |
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167 |
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168 // Nonzero means we need to do some extra lookahead to avoid being |
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169 // screwed by bogus function syntax. |
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170 bool maybe_screwed; |
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171 |
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172 // Nonzero means we need to do some extra lookahead to avoid being |
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173 // screwed by bogus function syntax. |
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174 int maybe_screwed_again; |
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175 |
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176 // Nonzero means we've seen something that means we must be past the |
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177 // range part of a plot command. |
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178 bool past_plot_range; |
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179 |
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180 // Nonzero means we're working on a plot command. |
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181 bool plotting; |
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182 |
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183 // Return transpose or start a string? |
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184 bool quote_is_transpose; |
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185 |
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186 private: |
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187 |
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188 lexical_feedback (const lexical_feedback&); |
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189 |
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190 lexical_feedback& operator = (const lexical_feedback&); |
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191 }; |
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192 |
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193 // Flags that need to be shared between the lexer and parser. |
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194 extern lexical_feedback lexer_flags; |
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195 |
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196 extern void symbols_of_lex (void); |
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197 |
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198 #endif |
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199 |
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200 /* |
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201 ;;; Local Variables: *** |
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202 ;;; mode: C++ *** |
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203 ;;; End: *** |
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204 */ |
