Mercurial > octave-nkf
annotate src/lex.h @ 8701:1652e39b934e
handle command names in declaration lists
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 09 Feb 2009 12:23:12 -0500 |
parents | ff9e7873f8ea |
children | 6dc61981d18b |
rev | line source |
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1 | 1 /* |
2 | |
7017 | 3 Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002, |
4 2003, 2004, 2005, 2006, 2007 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 |
5775 | 27 // FIXME -- these input buffer things should be members of a |
1826 | 28 // parser input stream class. |
29 | |
1 | 30 typedef struct yy_buffer_state *YY_BUFFER_STATE; |
31 | |
32 // Associate a buffer with a new file to read. | |
33 extern YY_BUFFER_STATE create_buffer (FILE *f); | |
34 | |
35 // Report the current buffer. | |
36 extern YY_BUFFER_STATE current_buffer (void); | |
37 | |
38 // Connect to new buffer buffer. | |
39 extern void switch_to_buffer (YY_BUFFER_STATE buf); | |
40 | |
41 // Delete a buffer. | |
42 extern void delete_buffer (YY_BUFFER_STATE buf); | |
43 | |
44 // Restore a buffer (for unwind-prot). | |
45 extern void restore_input_buffer (void *buf); | |
46 | |
47 // Delete a buffer (for unwind-prot). | |
48 extern void delete_input_buffer (void *buf); | |
49 | |
4867 | 50 // Is the given string a keyword? |
51 extern bool is_keyword (const std::string& s); | |
52 | |
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53 extern void prep_lexer_for_script (void); |
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54 |
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55 extern void force_local_variable (const std::string& name); |
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56 |
1826 | 57 // For communication between the lexer and parser. |
58 | |
3585 | 59 class |
60 lexical_feedback | |
1826 | 61 { |
62 public: | |
63 | |
64 lexical_feedback (void) { init (); } | |
65 | |
66 ~lexical_feedback (void) { } | |
67 | |
68 void init (void); | |
69 | |
3351 | 70 // Square bracket level count. |
71 int bracketflag; | |
1826 | 72 |
4613 | 73 // Curly brace level count. |
74 int braceflag; | |
75 | |
2877 | 76 // TRUE means we're in the middle of defining a loop. |
1826 | 77 int looping; |
78 | |
2877 | 79 // TRUE means that we should convert spaces to a comma inside a |
2857 | 80 // matrix definition. |
81 bool convert_spaces_to_comma; | |
82 | |
2877 | 83 // TRUE means we're in the middle of defining a function. |
2857 | 84 bool defining_func; |
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 | |
4237 | 107 // Nonzero means we're parsing an indexing operation for an object. |
108 int looking_at_object_index; | |
4234 | 109 |
2857 | 110 // GAG. Stupid kludge so that [[1,2][3,4]] will work. |
111 bool do_comma_insert; | |
112 | |
5102 | 113 // TRUE means we're doing a raw input command. |
114 bool doing_rawcommand; | |
115 | |
2877 | 116 // TRUE means we're looking at an indirect reference to a |
2857 | 117 // structure element. |
118 bool looking_at_indirect_ref; | |
119 | |
2877 | 120 // TRUE means that we've already seen the name of this function. |
121 // Should only matter if defining_func is also TRUE. | |
122 bool parsed_function_name; | |
123 | |
4240 | 124 // Are we parsing a nested function? |
125 // 1 ==> Yes. | |
126 // 0 ==> No. | |
127 // -1 ==> Yes, but it is the last one because we have seen EOF. | |
128 int parsing_nested_function; | |
4238 | 129 |
7336 | 130 // TRUE means we are parsing a class method. |
131 bool parsing_class_method; | |
132 | |
1826 | 133 // Return transpose or start a string? |
2857 | 134 bool quote_is_transpose; |
1826 | 135 |
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136 // Set of identifiers that might be local variable names. |
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137 std::set<std::string> pending_local_variables; |
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138 |
1826 | 139 private: |
140 | |
141 lexical_feedback (const lexical_feedback&); | |
142 | |
143 lexical_feedback& operator = (const lexical_feedback&); | |
144 }; | |
145 | |
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146 class |
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147 stream_reader |
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148 { |
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149 public: |
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150 virtual int getc (void) = 0; |
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151 virtual int ungetc (int c) = 0; |
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152 |
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153 protected: |
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154 stream_reader (void) { } |
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155 ~stream_reader (void) { } |
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156 |
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157 private: |
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158 |
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159 // No copying! |
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160 stream_reader (const stream_reader&); |
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161 stream_reader& operator = (const stream_reader&); |
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162 }; |
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163 |
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164 extern std::string |
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165 grab_comment_block (stream_reader& reader, bool at_bol, bool& eof); |
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166 |
3883 | 167 // TRUE means that we have encountered EOF on the input stream. |
168 extern bool parser_end_of_input; | |
169 | |
1826 | 170 // Flags that need to be shared between the lexer and parser. |
171 extern lexical_feedback lexer_flags; | |
440 | 172 |
1 | 173 #endif |
174 | |
175 /* | |
176 ;;; Local Variables: *** | |
177 ;;; mode: C++ *** | |
178 ;;; End: *** | |
179 */ |