Mercurial > octave
annotate src/lex.h @ 11464:21b5284fa78d
avoid error when parsing nested functions
author | John W. Eaton <jwe@octave.org> |
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date | Sun, 09 Jan 2011 14:33:55 -0500 |
parents | b2191ebea12f |
children | 6dbf9bcce90e |
rev | line source |
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1 | 1 /* |
2 | |
7017 | 3 Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002, |
8920 | 4 2003, 2004, 2005, 2006, 2007, 2008, 2009 John W. Eaton |
1 | 5 |
6 This file is part of Octave. | |
7 | |
8 Octave is free software; you can redistribute it and/or modify it | |
9 under the terms of the GNU General Public License as published by the | |
7016 | 10 Free Software Foundation; either version 3 of the License, or (at your |
11 option) any later version. | |
1 | 12 |
13 Octave is distributed in the hope that it will be useful, but WITHOUT | |
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 for more details. | |
17 | |
18 You should have received a copy of the GNU General Public License | |
7016 | 19 along with Octave; see the file COPYING. If not, see |
20 <http://www.gnu.org/licenses/>. | |
1 | 21 |
22 */ | |
23 | |
383 | 24 #if !defined (octave_lex_h) |
25 #define octave_lex_h 1 | |
1 | 26 |
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27 #include <list> |
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28 #include <stack> |
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29 |
5775 | 30 // FIXME -- these input buffer things should be members of a |
1826 | 31 // parser input stream class. |
32 | |
1 | 33 typedef struct yy_buffer_state *YY_BUFFER_STATE; |
34 | |
35 // Associate a buffer with a new file to read. | |
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36 extern OCTINTERP_API YY_BUFFER_STATE create_buffer (FILE *f); |
1 | 37 |
38 // Report the current buffer. | |
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39 extern OCTINTERP_API YY_BUFFER_STATE current_buffer (void); |
1 | 40 |
41 // Connect to new buffer buffer. | |
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42 extern OCTINTERP_API void switch_to_buffer (YY_BUFFER_STATE buf); |
1 | 43 |
44 // Delete a buffer. | |
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45 extern OCTINTERP_API void delete_buffer (YY_BUFFER_STATE buf); |
1 | 46 |
4867 | 47 // Is the given string a keyword? |
48 extern bool is_keyword (const std::string& s); | |
49 | |
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50 extern void prep_lexer_for_script_file (void); |
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51 extern void prep_lexer_for_function_file (void); |
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52 |
1826 | 53 // For communication between the lexer and parser. |
54 | |
3585 | 55 class |
56 lexical_feedback | |
1826 | 57 { |
58 public: | |
59 | |
60 lexical_feedback (void) { init (); } | |
61 | |
62 ~lexical_feedback (void) { } | |
63 | |
64 void init (void); | |
65 | |
3351 | 66 // Square bracket level count. |
67 int bracketflag; | |
1826 | 68 |
4613 | 69 // Curly brace level count. |
70 int braceflag; | |
71 | |
2877 | 72 // TRUE means we're in the middle of defining a loop. |
1826 | 73 int looping; |
74 | |
2877 | 75 // TRUE means that we should convert spaces to a comma inside a |
2857 | 76 // matrix definition. |
77 bool convert_spaces_to_comma; | |
78 | |
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79 // TRUE means we are at the beginning of a statement, where a |
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80 // command name is possible. |
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81 bool at_beginning_of_statement; |
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82 |
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83 // Nonzero means we're in the middle of defining a function. |
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84 int defining_func; |
2857 | 85 |
4930 | 86 // Nonzero means we are parsing a function handle. |
87 int looking_at_function_handle; | |
88 | |
2877 | 89 // TRUE means we're parsing the return list for a function. |
2857 | 90 bool looking_at_return_list; |
91 | |
2877 | 92 // TRUE means we're parsing the parameter list for a function. |
2857 | 93 bool looking_at_parameter_list; |
94 | |
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95 // TRUE means we're parsing a declaration list (global or |
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96 // persistent). |
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97 bool looking_at_decl_list; |
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98 |
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99 // TRUE means we are looking at the initializer expression for a |
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100 // parameter list element. |
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101 bool looking_at_initializer_expression; |
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102 |
3189 | 103 // TRUE means we're parsing a matrix or the left hand side of |
104 // multi-value assignment statement. | |
105 bool looking_at_matrix_or_assign_lhs; | |
106 | |
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107 // If the front of the list is TRUE, the closest paren, brace, or |
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108 // bracket nesting is an index for an object. |
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109 std::list<bool> looking_at_object_index; |
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110 |
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111 // Object index not possible until we've seen something. |
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112 bool looking_for_object_index; |
4234 | 113 |
2857 | 114 // GAG. Stupid kludge so that [[1,2][3,4]] will work. |
115 bool do_comma_insert; | |
116 | |
2877 | 117 // TRUE means we're looking at an indirect reference to a |
2857 | 118 // structure element. |
119 bool looking_at_indirect_ref; | |
120 | |
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121 // If the top of the stack is TRUE, then we've already seen the name |
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122 // of the current function. Should only matter if |
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123 // current_function_level > 0 |
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124 std::stack<bool> parsed_function_name; |
2877 | 125 |
9476 | 126 // TRUE means we are parsing a class method in function or classdef file. |
7336 | 127 bool parsing_class_method; |
128 | |
9476 | 129 // TRUE means we are parsing a class method declaration line in a |
130 // classdef file and can accept a property get or set method name. | |
131 // For example, "get.PropertyName" is recognized as a function name. | |
132 bool maybe_classdef_get_set_method; | |
133 | |
134 // TRUE means we are parsing a classdef file | |
135 bool parsing_classdef; | |
136 | |
1826 | 137 // Return transpose or start a string? |
2857 | 138 bool quote_is_transpose; |
1826 | 139 |
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140 // Set of identifiers that might be local variable names. |
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141 std::set<std::string> pending_local_variables; |
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142 |
1826 | 143 private: |
144 | |
145 lexical_feedback (const lexical_feedback&); | |
146 | |
147 lexical_feedback& operator = (const lexical_feedback&); | |
148 }; | |
149 | |
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150 class |
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151 stream_reader |
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152 { |
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153 public: |
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154 virtual int getc (void) = 0; |
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155 virtual int ungetc (int c) = 0; |
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156 |
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157 protected: |
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158 stream_reader (void) { } |
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159 ~stream_reader (void) { } |
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160 |
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161 private: |
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162 |
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163 // No copying! |
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164 stream_reader (const stream_reader&); |
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165 stream_reader& operator = (const stream_reader&); |
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166 }; |
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167 |
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168 extern std::string |
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169 grab_comment_block (stream_reader& reader, bool at_bol, bool& eof); |
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170 |
3883 | 171 // TRUE means that we have encountered EOF on the input stream. |
172 extern bool parser_end_of_input; | |
173 | |
1826 | 174 // Flags that need to be shared between the lexer and parser. |
175 extern lexical_feedback lexer_flags; | |
440 | 176 |
1 | 177 #endif |