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annotate libinterp/parse-tree/lex.h @ 16193:d7392bf42fd1

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use inheritance to simplify initialization in octave_lexer constructor * lex.h (lexical_feedback): New class containing feedback data for the lexer that was previously contained directly in octave_lexer. (octave_lexer): Inherit from lexical_feedback.
author John W. Eaton <jwe@octave.org>
date Tue, 05 Mar 2013 10:19:38 -0500
parents e810e7d941a1
children b7ca669af528
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1 /*
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2
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72c96de7a403 maint: update copyright notices for 2012
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3 Copyright (C) 1993-2012 John W. Eaton
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4
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5 This file is part of Octave.
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6
78fd87e624cb [project @ 1993-08-08 01:13:40 by jwe]
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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.
1
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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 <set>
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28 #include <stack>
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29
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30 extern OCTINTERP_API void cleanup_parser (void);
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31
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32 // Is the given string a keyword?
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33 extern bool is_keyword (const std::string& s);
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34
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35 class
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36 stream_reader
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37 {
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38 public:
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39 virtual int getc (void) = 0;
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40 virtual int ungetc (int c) = 0;
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41
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42 protected:
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43 stream_reader (void) { }
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44 ~stream_reader (void) { }
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45
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46 private:
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47
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48 // No copying!
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49 stream_reader (const stream_reader&);
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50 stream_reader& operator = (const stream_reader&);
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51 };
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52
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53 // Forward decl for octave_lexer::token_stack.
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54 class token;
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55
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56 // For communication between the lexer and parser.
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57
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58 class
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59 lexical_feedback
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60 {
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61 public:
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62
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63 // Did eat_whitespace or eat_continuation eat a space or tab, or a
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64 // newline, or both?
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65 //
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66 // Functions that return this type will return a logical OR of the
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67 // following values:
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68 //
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69 // NO_WHITESPACE no spaces to eat
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70 // SPACE_OR_TAB space or tab in input
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71 // NEWLINE bare new line in input
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72
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73 enum whitespace_type
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74 {
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75 NO_WHITESPACE = 1,
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76 SPACE_OR_TAB = 2,
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77 NEWLINE = 4
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78 };
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79
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80 // Track nesting of square brackets, curly braces, and parentheses.
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81
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82 class bbp_nesting_level
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83 {
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84 private:
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85
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86 enum bracket_type
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87 {
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88 BRACKET = 1,
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89 BRACE = 2,
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90 PAREN = 3
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91 };
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92
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93 public:
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94
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95 bbp_nesting_level (void) : context () { }
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96
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97 bbp_nesting_level (const bbp_nesting_level& nl) : context (nl.context) { }
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98
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99 bbp_nesting_level& operator = (const bbp_nesting_level& nl)
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100 {
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101 if (&nl != this)
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102 context = nl.context;
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103
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104 return *this;
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105 }
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106
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107 ~bbp_nesting_level (void) { }
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108
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109 void bracket (void) { context.push (BRACKET); }
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110
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111 bool is_bracket (void)
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112 {
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113 return ! context.empty () && context.top () == BRACKET;
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114 }
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115
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116 void brace (void) { context.push (BRACE); }
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117
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118 bool is_brace (void)
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119 {
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120 return ! context.empty () && context.top () == BRACE;
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121 }
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122
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123 void paren (void) { context.push (PAREN); }
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124
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125 bool is_paren (void)
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126 {
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127 return ! context.empty () && context.top () == PAREN;
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128 }
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129
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130 bool is_bracket_or_brace (void)
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131 {
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132 return (! context.empty ()
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133 && (context.top () == BRACKET || context.top () == BRACE));
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134 }
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135
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136 bool none (void) { return context.empty (); }
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137
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138 void remove (void)
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139 {
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140 if (! context.empty ())
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141 context.pop ();
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142 }
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143
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144 void clear (void)
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145 {
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146 while (! context.empty ())
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147 context.pop ();
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148 }
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149
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150 private:
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151
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152 std::stack<int> context;
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153 };
16193
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154
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155 lexical_feedback (void)
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156 : end_of_input (false), convert_spaces_to_comma (true),
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157 do_comma_insert (false), at_beginning_of_statement (true),
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158 looking_at_anon_fcn_args (false), looking_at_return_list (false),
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159 looking_at_parameter_list (false), looking_at_decl_list (false),
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160 looking_at_initializer_expression (false),
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161 looking_at_matrix_or_assign_lhs (false),
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162 looking_for_object_index (false),
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163 looking_at_indirect_ref (false), parsing_class_method (false),
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164 maybe_classdef_get_set_method (false), parsing_classdef (false),
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165 quote_is_transpose (false),
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166 input_line_number (1), current_input_column (1),
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167 bracketflag (0), braceflag (0),
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168 looping (0), defining_func (0), looking_at_function_handle (0),
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169 block_comment_nesting_level (0),
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170 looking_at_object_index (), parsed_function_name (),
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171 pending_local_variables (), nesting_level (), token_stack ()
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172 {
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173 init ();
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174 }
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175
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176 ~lexical_feedback (void);
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177
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178 void init (void);
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179
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180 // true means that we have encountered eof on the input stream.
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181 bool end_of_input;
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182
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183 // true means that we should convert spaces to a comma inside a
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184 // matrix definition.
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185 bool convert_spaces_to_comma;
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186
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187 // gag. stupid kludge so that [[1,2][3,4]] will work.
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188 bool do_comma_insert;
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189
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190 // true means we are at the beginning of a statement, where a
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191 // command name is possible.
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192 bool at_beginning_of_statement;
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193
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194 // true means we are parsing an anonymous function argument list.
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195 bool looking_at_anon_fcn_args;
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196
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197 // true means we're parsing the return list for a function.
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198 bool looking_at_return_list;
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199
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200 // true means we're parsing the parameter list for a function.
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201 bool looking_at_parameter_list;
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202
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203 // true means we're parsing a declaration list (global or
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204 // persistent).
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205 bool looking_at_decl_list;
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206
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207 // true means we are looking at the initializer expression for a
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208 // parameter list element.
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209 bool looking_at_initializer_expression;
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210
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211 // true means we're parsing a matrix or the left hand side of
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212 // multi-value assignment statement.
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213 bool looking_at_matrix_or_assign_lhs;
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214
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215 // object index not possible until we've seen something.
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216 bool looking_for_object_index;
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217
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218 // true means we're looking at an indirect reference to a
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219 // structure element.
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220 bool looking_at_indirect_ref;
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221
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222 // true means we are parsing a class method in function or classdef file.
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223 bool parsing_class_method;
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224
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225 // true means we are parsing a class method declaration line in a
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226 // classdef file and can accept a property get or set method name.
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227 // for example, "get.propertyname" is recognized as a function name.
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228 bool maybe_classdef_get_set_method;
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229
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230 // true means we are parsing a classdef file
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231 bool parsing_classdef;
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232
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233 // return transpose or start a string?
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234 bool quote_is_transpose;
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235
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236 // the current input line number.
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237 int input_line_number;
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238
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239 // the column of the current token.
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240 int current_input_column;
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241
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242 // square bracket level count.
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243 int bracketflag;
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244
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245 // curly brace level count.
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246 int braceflag;
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247
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248 // true means we're in the middle of defining a loop.
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249 int looping;
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250
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251 // nonzero means we're in the middle of defining a function.
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252 int defining_func;
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253
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254 // nonzero means we are parsing a function handle.
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255 int looking_at_function_handle;
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256
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257 // nestng level for blcok comments.
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258 int block_comment_nesting_level;
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259
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260 // if the front of the list is true, the closest paren, brace, or
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261 // bracket nesting is an index for an object.
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262 std::list<bool> looking_at_object_index;
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263
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264 // if the top of the stack is true, then we've already seen the name
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265 // of the current function. should only matter if
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266 // current_function_level > 0
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267 std::stack<bool> parsed_function_name;
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268
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269 // set of identifiers that might be local variable names.
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270 std::set<std::string> pending_local_variables;
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271
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272 // is the closest nesting level a square bracket, squiggly brace or
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273 // a paren?
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274 bbp_nesting_level nesting_level;
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275
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276 // Stack to hold tokens so that we can delete them when the parser is
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277 // reset and avoid growing forever just because we are stashing some
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278 // information.
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279 std::stack <token*> token_stack;
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280
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281 private:
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282
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283 // No copying!
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284
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285 lexical_feedback (const lexical_feedback&);
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286
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287 lexical_feedback& operator = (const lexical_feedback&);
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288 };
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289
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290 // octave_lexer inherits from lexical_feedback because we will
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291 // eventually have several different constructors and it is easier to
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292 // intialize if everything is grouped in a parent class rather than
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293 // listing all the members in the octave_lexer class.
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294
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295 class
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296 octave_lexer : public lexical_feedback
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297 {
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298 public:
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299
16183
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300 // Handle buffering of input for lexer.
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301
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302 class input_buffer
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303 {
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304 public:
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305
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306 input_buffer (void)
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307 : buffer (), pos (0), chars_left (0), eof (false)
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308 { }
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309
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310 // Grab more input from the current input source.
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311 void read (void);
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312
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313 // Copy at most max_size characters to buf.
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314 int copy_chunk (char *buf, size_t max_size);
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315
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316 bool empty (void) const { return chars_left == 0; }
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317
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318 bool at_eof (void) const { return eof; }
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319
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320 private:
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321
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322 std::string buffer;
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323 const char *pos;
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324 size_t chars_left;
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325 bool eof;
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326 };
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327
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328 octave_lexer (void)
16193
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329 : lexical_feedback (), scanner (0), input_buf ()
16101
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330 {
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331 init ();
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332 }
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333
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334 ~octave_lexer (void);
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b14829582cc4 [project @ 1996-02-02 03:05:07 by jwe]
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335
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336 void init (void);
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337
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338 void reset (void);
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339
16124
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340 void prep_for_script_file (void);
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341
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342 void prep_for_function_file (void);
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343
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344 int octave_read (char *buf, unsigned int max_size);
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345
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346 int handle_end_of_input (void);
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347
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348 char *flex_yytext (void);
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349
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350 int flex_yyleng (void);
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351
16113
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352 void do_comma_insert_check (void);
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353
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354 int text_yyinput (void);
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355
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356 void xunput (char c, char *buf);
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357
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358 void xunput (char c);
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359
16113
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360 void fixup_column_count (char *s);
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361
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362 bool inside_any_object_index (void);
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363
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364 int is_keyword_token (const std::string& s);
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365
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366 bool is_variable (const std::string& name);
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367
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368 std::string grab_block_comment (stream_reader& reader, bool& eof);
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369
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370 std::string grab_comment_block (stream_reader& reader, bool at_bol,
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371 bool& eof);
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372
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373 int process_comment (bool start_in_block, bool& eof);
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374
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375 bool next_token_is_sep_op (void);
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376
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377 bool next_token_is_postfix_unary_op (bool spc_prev);
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378
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379 bool next_token_is_bin_op (bool spc_prev);
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380
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381 void scan_for_comments (const char *text);
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382
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383 int eat_whitespace (void);
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384
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385 void handle_number (void);
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386
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387 bool have_continuation (bool trailing_comments_ok = true);
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388
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389 bool have_ellipsis_continuation (bool trailing_comments_ok = true);
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390
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391 int eat_continuation (void);
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392
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393 int handle_string (char delim);
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394
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diff changeset
395 bool next_token_is_assign_op (void);
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diff changeset
396
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diff changeset
397 bool next_token_is_index_op (void);
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diff changeset
398
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diff changeset
399 int handle_close_bracket (bool spc_gobbled, int bracket_type);
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diff changeset
400
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diff changeset
401 void maybe_unput_comma (int spc_gobbled);
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diff changeset
402
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diff changeset
403 bool next_token_can_follow_bin_op (void);
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diff changeset
404
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
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diff changeset
405 bool looks_like_command_arg (void);
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diff changeset
406
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
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diff changeset
407 int handle_superclass_identifier (void);
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diff changeset
408
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
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diff changeset
409 int handle_meta_identifier (void);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
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diff changeset
410
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
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diff changeset
411 int handle_identifier (void);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
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diff changeset
412
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
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diff changeset
413 void maybe_warn_separator_insert (char sep);
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diff changeset
414
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
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diff changeset
415 void gripe_single_quote_string (void);
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John W. Eaton <jwe@octave.org>
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diff changeset
416
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diff changeset
417 void gripe_matlab_incompatible (const std::string& msg);
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diff changeset
418
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diff changeset
419 void maybe_gripe_matlab_incompatible_comment (char c);
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diff changeset
420
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
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diff changeset
421 void gripe_matlab_incompatible_continuation (void);
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diff changeset
422
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diff changeset
423 void gripe_matlab_incompatible_operator (const std::string& op);
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diff changeset
424
16126
5c885c13bfa3 localize use of yylval.tok_val in lexical_feedback member functions
John W. Eaton <jwe@octave.org>
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425 void push_token (token *);
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426
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427 token *current_token (void);
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428
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429 void display_token (int tok);
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430
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431 void fatal_error (const char *msg);
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432
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433 void lexer_debug (const char *pattern, const char *text);
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434
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435 // Internal state of the flex-generated lexer.
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436 void *scanner;
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437
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438 // Object that reads and buffers input.
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439 input_buffer input_buf;
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440
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441 // For unwind protect.
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442 static void cleanup (octave_lexer *lexer) { delete lexer; }
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443
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444 private:
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445
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446 // No copying!
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447
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448 octave_lexer (const octave_lexer&);
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449
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450 octave_lexer& operator = (const octave_lexer&);
1826
b14829582cc4 [project @ 1996-02-02 03:05:07 by jwe]
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451 };
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452
1
78fd87e624cb [project @ 1993-08-08 01:13:40 by jwe]
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453 #endif