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annotate src/lex.h @ 12164:18e9a8da7d18

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eliminate some -Weffc++ warnings
author Pascal Dupuis <Pascal.Dupuis@uclouvain.be>
date Wed, 26 Jan 2011 05:20:33 -0500
parents 12df7854fa7c
children 1bfca2bbea8b
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1 /*
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2
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3 Copyright (C) 1993-2011 John W. Eaton
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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 3 of the License, or (at your
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10 option) any 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, see
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19 <http://www.gnu.org/licenses/>.
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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 #include <list>
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27 #include <stack>
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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 // Is the given string a keyword?
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47 extern bool is_keyword (const std::string& s);
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48
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49 extern void prep_lexer_for_script_file (void);
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50 extern void prep_lexer_for_function_file (void);
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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)
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60
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61 : bracketflag (0), braceflag (0), looping (0),
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62 convert_spaces_to_comma (true), at_beginning_of_statement (true),
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63 defining_func (0), looking_at_function_handle (false),
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64 looking_at_return_list (false), looking_at_parameter_list (false),
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65 looking_at_decl_list (false), looking_at_initializer_expression (false),
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66 looking_at_matrix_or_assign_lhs (false), looking_at_object_index (),
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67 looking_for_object_index (false), do_comma_insert (false),
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68 looking_at_indirect_ref (false), parsed_function_name (),
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69 parsing_class_method (false), maybe_classdef_get_set_method (false),
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70 parsing_classdef (false), quote_is_transpose (false),
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71 pending_local_variables ()
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72
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73 {
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74 init ();
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75 }
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76
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77 ~lexical_feedback (void) { }
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78
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79 void init (void);
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80
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81 // Square bracket level count.
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82 int bracketflag;
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83
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84 // Curly brace level count.
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85 int braceflag;
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86
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87 // TRUE means we're in the middle of defining a loop.
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88 int looping;
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89
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90 // TRUE means that we should convert spaces to a comma inside a
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91 // matrix definition.
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92 bool convert_spaces_to_comma;
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93
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94 // TRUE means we are at the beginning of a statement, where a
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95 // command name is possible.
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96 bool at_beginning_of_statement;
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97
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98 // Nonzero means we're in the middle of defining a function.
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99 int defining_func;
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100
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101 // Nonzero means we are parsing a function handle.
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102 int looking_at_function_handle;
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103
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104 // TRUE means we're parsing the return list for a function.
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105 bool looking_at_return_list;
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106
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107 // TRUE means we're parsing the parameter list for a function.
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108 bool looking_at_parameter_list;
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109
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110 // TRUE means we're parsing a declaration list (global or
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111 // persistent).
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112 bool looking_at_decl_list;
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113
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114 // TRUE means we are looking at the initializer expression for a
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115 // parameter list element.
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116 bool looking_at_initializer_expression;
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117
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118 // TRUE means we're parsing a matrix or the left hand side of
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119 // multi-value assignment statement.
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120 bool looking_at_matrix_or_assign_lhs;
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121
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122 // If the front of the list is TRUE, the closest paren, brace, or
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123 // bracket nesting is an index for an object.
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124 std::list<bool> looking_at_object_index;
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125
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126 // Object index not possible until we've seen something.
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127 bool looking_for_object_index;
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128
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129 // GAG. Stupid kludge so that [[1,2][3,4]] will work.
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130 bool do_comma_insert;
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131
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132 // TRUE means we're looking at an indirect reference to a
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133 // structure element.
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134 bool looking_at_indirect_ref;
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135
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136 // If the top of the stack is TRUE, then we've already seen the name
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137 // of the current function. Should only matter if
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138 // current_function_level > 0
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139 std::stack<bool> parsed_function_name;
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140
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141 // TRUE means we are parsing a class method in function or classdef file.
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142 bool parsing_class_method;
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143
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144 // TRUE means we are parsing a class method declaration line in a
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145 // classdef file and can accept a property get or set method name.
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146 // For example, "get.PropertyName" is recognized as a function name.
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147 bool maybe_classdef_get_set_method;
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148
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149 // TRUE means we are parsing a classdef file
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150 bool parsing_classdef;
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151
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152 // Return transpose or start a string?
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153 bool quote_is_transpose;
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154
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155 // Set of identifiers that might be local variable names.
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156 std::set<std::string> pending_local_variables;
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157
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158 private:
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159
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160 lexical_feedback (const lexical_feedback&);
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161
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162 lexical_feedback& operator = (const lexical_feedback&);
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163 };
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164
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165 class
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166 stream_reader
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167 {
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168 public:
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169 virtual int getc (void) = 0;
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170 virtual int ungetc (int c) = 0;
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171
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172 protected:
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173 stream_reader (void) { }
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174 ~stream_reader (void) { }
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175
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176 private:
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177
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178 // No copying!
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179 stream_reader (const stream_reader&);
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180 stream_reader& operator = (const stream_reader&);
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181 };
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182
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183 extern std::string
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184 grab_comment_block (stream_reader& reader, bool at_bol, bool& eof);
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185
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186 // TRUE means that we have encountered EOF on the input stream.
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187 extern bool parser_end_of_input;
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188
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189 // Flags that need to be shared between the lexer and parser.
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190 extern lexical_feedback lexer_flags;
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191
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192 #endif