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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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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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26 // XXX FIXME XXX -- these input buffer things should be members of a |
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27 // parser input stream class. |
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28 |
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29 typedef struct yy_buffer_state *YY_BUFFER_STATE; |
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30 |
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31 // Associate a buffer with a new file to read. |
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32 extern YY_BUFFER_STATE create_buffer (FILE *f); |
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33 |
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34 // Report the current buffer. |
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35 extern YY_BUFFER_STATE current_buffer (void); |
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36 |
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37 // Connect to new buffer buffer. |
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38 extern void switch_to_buffer (YY_BUFFER_STATE buf); |
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39 |
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40 // Delete a buffer. |
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41 extern void delete_buffer (YY_BUFFER_STATE buf); |
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42 |
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43 // Restore a buffer (for unwind-prot). |
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44 extern void restore_input_buffer (void *buf); |
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45 |
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46 // Delete a buffer (for unwind-prot). |
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47 extern void delete_input_buffer (void *buf); |
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48 |
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49 // Is the given string a keyword? |
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50 extern bool is_keyword (const std::string& s); |
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51 |
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52 // For communication between the lexer and parser. |
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53 |
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54 class |
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55 lexical_feedback |
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56 { |
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57 public: |
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58 |
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59 lexical_feedback (void) { init (); } |
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60 |
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61 ~lexical_feedback (void) { } |
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62 |
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63 void init (void); |
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64 |
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65 // Square bracket level count. |
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66 int bracketflag; |
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67 |
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68 // Curly brace level count. |
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69 int braceflag; |
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70 |
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71 // TRUE means we're in the middle of defining a loop. |
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72 int looping; |
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73 |
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74 // TRUE means we think we are looking at the beginning of a |
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75 // function definition. |
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76 bool beginning_of_function; |
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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 bool cant_be_identifier; |
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81 |
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82 // TRUE means that we should convert spaces to a comma inside a |
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83 // matrix definition. |
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84 bool convert_spaces_to_comma; |
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85 |
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86 // TRUE means we're in the middle of defining a function. |
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87 bool defining_func; |
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88 |
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89 // TRUE means we're parsing the return list for a function. |
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90 bool looking_at_return_list; |
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91 |
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92 // TRUE means we're parsing the parameter list for a function. |
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93 bool looking_at_parameter_list; |
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94 |
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95 // TRUE means we're parsing a matrix or the left hand side of |
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96 // multi-value assignment statement. |
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97 bool looking_at_matrix_or_assign_lhs; |
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98 |
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99 // Nonzero means we're parsing an indexing operation for an object. |
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100 int looking_at_object_index; |
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101 |
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102 // GAG. Stupid kludge so that [[1,2][3,4]] will work. |
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103 bool do_comma_insert; |
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104 |
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105 // TRUE means we think we are looking at a set command. |
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106 bool doing_set; |
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107 |
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108 // TRUE means we're looking at the range part of a plot command. |
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109 bool in_plot_range; |
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110 |
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111 // TRUE means we're looking at the using part of a plot command. |
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112 bool in_plot_using; |
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113 |
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114 // TRUE means we're looking at the style part of a plot command. |
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115 bool in_plot_style; |
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116 |
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117 // TRUE means we're looking at the axes part of a plot command. |
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118 bool in_plot_axes; |
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119 |
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120 // TRUE means we're looking at an indirect reference to a |
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121 // structure element. |
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122 bool looking_at_indirect_ref; |
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123 |
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124 // TRUE means that we've already seen the name of this function. |
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125 // Should only matter if defining_func is also TRUE. |
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126 bool parsed_function_name; |
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127 |
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128 // Are we parsing a nested function? |
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129 // 1 ==> Yes. |
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130 // 0 ==> No. |
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131 // -1 ==> Yes, but it is the last one because we have seen EOF. |
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132 int parsing_nested_function; |
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133 |
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134 // TRUE means we've seen something that means we must be past the |
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135 // range part of a plot command. |
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136 bool past_plot_range; |
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137 |
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138 // TRUE means we're working on a plot command. |
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139 bool plotting; |
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140 |
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141 // Return transpose or start a string? |
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142 bool quote_is_transpose; |
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143 |
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144 private: |
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145 |
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146 lexical_feedback (const lexical_feedback&); |
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147 |
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148 lexical_feedback& operator = (const lexical_feedback&); |
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149 }; |
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150 |
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151 // TRUE means that we have encountered EOF on the input stream. |
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152 extern bool parser_end_of_input; |
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153 |
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154 // Flags that need to be shared between the lexer and parser. |
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155 extern lexical_feedback lexer_flags; |
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156 |
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157 #endif |
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158 |
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159 /* |
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160 ;;; Local Variables: *** |
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161 ;;; mode: C++ *** |
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162 ;;; End: *** |
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163 */ |
