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annotate src/lex.h @ 12119:e320928eeb3a release-3-2-x release-3-2-4

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version 3.2.4
author Jaroslav Hajek <highegg@gmail.com>
date Fri, 22 Jan 2010 12:43:12 +0100
parents b2790fd23800
children 17af7cce7d1b
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1 /*
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2
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3 Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002,
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4 2003, 2004, 2005, 2006, 2007, 2008, 2009 John W. Eaton
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5
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6 This file is part of Octave.
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7
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8 Octave is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published by the
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10 Free Software Foundation; either version 3 of the License, or (at your
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11 option) any later version.
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12
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13 Octave is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with Octave; see the file COPYING. If not, see
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20 <http://www.gnu.org/licenses/>.
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22 */
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23
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24 #if !defined (octave_lex_h)
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25 #define octave_lex_h 1
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26
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27 #include <list>
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28
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29 // FIXME -- these input buffer things should be members of a
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30 // parser input stream class.
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31
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32 typedef struct yy_buffer_state *YY_BUFFER_STATE;
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33
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34 // Associate a buffer with a new file to read.
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35 extern OCTINTERP_API YY_BUFFER_STATE create_buffer (FILE *f);
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36
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37 // Report the current buffer.
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38 extern OCTINTERP_API YY_BUFFER_STATE current_buffer (void);
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39
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40 // Connect to new buffer buffer.
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41 extern OCTINTERP_API void switch_to_buffer (YY_BUFFER_STATE buf);
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42
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43 // Delete a buffer.
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44 extern OCTINTERP_API void delete_buffer (YY_BUFFER_STATE buf);
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45
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46 // Restore a buffer (for unwind-prot).
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47 extern OCTINTERP_API void restore_input_buffer (void *buf);
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48
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49 // Delete a buffer (for unwind-prot).
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50 extern OCTINTERP_API void delete_input_buffer (void *buf);
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51
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52 // Is the given string a keyword?
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53 extern bool is_keyword (const std::string& s);
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54
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55 extern void prep_lexer_for_script (void);
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56
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57 // For communication between the lexer and parser.
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58
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59 class
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60 lexical_feedback
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61 {
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62 public:
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63
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64 lexical_feedback (void) { init (); }
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65
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66 ~lexical_feedback (void) { }
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67
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68 void init (void);
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69
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70 // Square bracket level count.
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71 int bracketflag;
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72
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73 // Curly brace level count.
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74 int braceflag;
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75
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76 // TRUE means we're in the middle of defining a loop.
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77 int looping;
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78
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79 // TRUE means that we should convert spaces to a comma inside a
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80 // matrix definition.
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81 bool convert_spaces_to_comma;
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82
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83 // TRUE means we are at the beginning of a statement, where a
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84 // command name is possible.
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85 bool at_beginning_of_statement;
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86
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87 // TRUE means we're in the middle of defining a function.
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88 bool defining_func;
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89
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90 // Nonzero means we are parsing a function handle.
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91 int looking_at_function_handle;
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92
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93 // TRUE means we're parsing the return list for a function.
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94 bool looking_at_return_list;
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95
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96 // TRUE means we're parsing the parameter list for a function.
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97 bool looking_at_parameter_list;
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98
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99 // TRUE means we're parsing a declaration list (global or
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100 // persistent).
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101 bool looking_at_decl_list;
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102
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103 // TRUE means we are looking at the initializer expression for a
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104 // parameter list element.
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105 bool looking_at_initializer_expression;
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106
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107 // TRUE means we're parsing a matrix or the left hand side of
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108 // multi-value assignment statement.
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109 bool looking_at_matrix_or_assign_lhs;
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110
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111 // If the front of the list is TRUE, the closest paren, brace, or
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112 // bracket nesting is an index for an object.
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113 std::list<bool> looking_at_object_index;
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114
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115 // Object index not possible until we've seen something.
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116 bool looking_for_object_index;
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117
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118 // GAG. Stupid kludge so that [[1,2][3,4]] will work.
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119 bool do_comma_insert;
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120
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121 // TRUE means we're looking at an indirect reference to a
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122 // structure element.
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123 bool looking_at_indirect_ref;
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124
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125 // TRUE means that we've already seen the name of this function.
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126 // Should only matter if defining_func is also TRUE.
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127 bool parsed_function_name;
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128
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129 // Are we parsing a nested function?
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130 // 1 ==> Yes.
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131 // 0 ==> No.
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132 // -1 ==> Yes, but it is the last one because we have seen EOF.
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133 int parsing_nested_function;
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134
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135 // TRUE means we are parsing a class method.
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136 bool parsing_class_method;
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137
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138 // Return transpose or start a string?
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139 bool quote_is_transpose;
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140
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141 // Set of identifiers that might be local variable names.
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142 std::set<std::string> pending_local_variables;
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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 class
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152 stream_reader
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153 {
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154 public:
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155 virtual int getc (void) = 0;
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156 virtual int ungetc (int c) = 0;
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157
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158 protected:
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159 stream_reader (void) { }
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160 ~stream_reader (void) { }
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161
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162 private:
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163
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164 // No copying!
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165 stream_reader (const stream_reader&);
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166 stream_reader& operator = (const stream_reader&);
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167 };
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168
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169 extern std::string
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170 grab_comment_block (stream_reader& reader, bool at_bol, bool& eof);
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171
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172 // TRUE means that we have encountered EOF on the input stream.
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173 extern bool parser_end_of_input;
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174
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175 // Flags that need to be shared between the lexer and parser.
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176 extern lexical_feedback lexer_flags;
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177
1
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178 #endif
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179
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180 /*
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181 ;;; Local Variables: ***
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182 ;;; mode: C++ ***
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183 ;;; End: ***
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184 */