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annotate libinterp/parse-tree/lex.h @ 16183:359d56094efa

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handle lexer input buffering with class * lex.h, lex.ll (octave_lexer::input_buffer): New class. (octave_lexer::input_buf): New data member. (octave_lexer::octave_lexer): Initialize it. (octave_lexer::octave_read): Use input_buf to simplify function and replace static data.
author John W. Eaton <jwe@octave.org>
date Sun, 03 Mar 2013 14:02:41 -0500
parents c5bfdc4c0963
children e810e7d941a1
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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
78fd87e624cb [project @ 1993-08-08 01:13:40 by jwe]
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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 octave_lexer
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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
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81 // Track nesting of square brackets, curly braces, and parentheses.
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82
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83 class bbp_nesting_level
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84 {
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85 private:
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86
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87 enum bracket_type
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88 {
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89 BRACKET = 1,
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90 BRACE = 2,
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91 PAREN = 3
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92 };
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93
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94 public:
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95
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96 bbp_nesting_level (void) : context () { }
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97
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98 bbp_nesting_level (const bbp_nesting_level& nl) : context (nl.context) { }
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99
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100 bbp_nesting_level& operator = (const bbp_nesting_level& nl)
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101 {
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102 if (&nl != this)
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103 context = nl.context;
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104
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105 return *this;
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106 }
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107
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108 ~bbp_nesting_level (void) { }
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109
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110 void bracket (void) { context.push (BRACKET); }
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111
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112 bool is_bracket (void)
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113 {
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114 return ! context.empty () && context.top () == BRACKET;
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115 }
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116
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117 void brace (void) { context.push (BRACE); }
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118
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119 bool is_brace (void)
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120 {
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121 return ! context.empty () && context.top () == BRACE;
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122 }
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123
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124 void paren (void) { context.push (PAREN); }
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125
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126 bool is_paren (void)
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127 {
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128 return ! context.empty () && context.top () == PAREN;
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129 }
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130
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131 bool is_bracket_or_brace (void)
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132 {
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133 return (! context.empty ()
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134 && (context.top () == BRACKET || context.top () == BRACE));
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135 }
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136
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137 bool none (void) { return context.empty (); }
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138
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139 void remove (void)
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140 {
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141 if (! context.empty ())
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142 context.pop ();
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143 }
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144
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145 void clear (void)
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146 {
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147 while (! context.empty ())
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148 context.pop ();
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149 }
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150
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151 private:
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152
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153 std::stack<int> context;
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154 };
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155
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156 // Handle buffering of input for lexer.
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157
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158 class input_buffer
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159 {
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160 public:
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161
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162 input_buffer (void)
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163 : buffer (), pos (0), chars_left (0), eof (false)
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164 { }
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165
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166 // Grab more input from the current input source.
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167 void read (void);
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168
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169 // Copy at most max_size characters to buf.
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170 int copy_chunk (char *buf, size_t max_size);
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171
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172 bool empty (void) const { return chars_left == 0; }
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173
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174 bool at_eof (void) const { return eof; }
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175
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176 private:
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177
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178 std::string buffer;
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179 const char *pos;
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180 size_t chars_left;
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181 bool eof;
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182 };
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183
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184 octave_lexer (void)
16164
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185 : scanner (0), end_of_input (false), convert_spaces_to_comma (true),
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49dfba4fd3c5 use pure parser and reentrant lexer interfaces
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186 do_comma_insert (false), at_beginning_of_statement (true),
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187 looking_at_anon_fcn_args (false), looking_at_return_list (false),
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188 looking_at_parameter_list (false), looking_at_decl_list (false),
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189 looking_at_initializer_expression (false),
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190 looking_at_matrix_or_assign_lhs (false),
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191 looking_for_object_index (false),
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192 looking_at_indirect_ref (false), parsing_class_method (false),
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193 maybe_classdef_get_set_method (false), parsing_classdef (false),
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2fd39ab12209 move a function and data member from lexical_feedback to octave_parser
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194 quote_is_transpose (false),
16103
6434f70f0ee0 move input_line_number and current_input_column to lexical_feedback class
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195 input_line_number (1), current_input_column (1),
16102
679a54d274d9 move global parser_end_of_input variable to lexical_feedback class
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196 bracketflag (0), braceflag (0),
16100
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197 looping (0), defining_func (0), looking_at_function_handle (0),
16105
b7de58feb2d3 move block_comment_nesting_level to lexical_feedback_class
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198 block_comment_nesting_level (0),
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199 looking_at_object_index (), parsed_function_name (),
16183
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200 pending_local_variables (), nesting_level (), input_buf ()
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201 {
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202 init ();
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203 }
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204
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205 ~octave_lexer (void);
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206
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207 void init (void);
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208
16139
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209 void reset (void);
16122
6884401b2fbb move reset_parser lexer helper function to lexical_feedback class
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210
16124
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diff changeset
211 void prep_for_script_file (void);
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212
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213 void prep_for_function_file (void);
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214
16120
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diff changeset
215 int octave_read (char *buf, unsigned int max_size);
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216
16164
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diff changeset
217 int handle_end_of_input (void);
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218
16128
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diff changeset
219 char *flex_yytext (void);
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220
16130
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diff changeset
221 int flex_yyleng (void);
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222
16113
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diff changeset
223 void do_comma_insert_check (void);
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224
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225 int text_yyinput (void);
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226
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227 void xunput (char c, char *buf);
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228
16125
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229 void xunput (char c);
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230
16113
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231 void fixup_column_count (char *s);
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232
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233 bool inside_any_object_index (void);
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234
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235 int is_keyword_token (const std::string& s);
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236
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237 bool is_variable (const std::string& name);
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238
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239 std::string grab_block_comment (stream_reader& reader, bool& eof);
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240
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241 std::string grab_comment_block (stream_reader& reader, bool at_bol,
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diff changeset
242 bool& eof);
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243
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244 int process_comment (bool start_in_block, bool& eof);
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245
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246 bool next_token_is_sep_op (void);
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247
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248 bool next_token_is_postfix_unary_op (bool spc_prev);
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249
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250 bool next_token_is_bin_op (bool spc_prev);
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251
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252 void scan_for_comments (const char *text);
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253
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diff changeset
254 int eat_whitespace (void);
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255
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diff changeset
256 void handle_number (void);
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257
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258 bool have_continuation (bool trailing_comments_ok = true);
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259
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diff changeset
260 bool have_ellipsis_continuation (bool trailing_comments_ok = true);
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261
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diff changeset
262 int eat_continuation (void);
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263
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diff changeset
264 int handle_string (char delim);
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265
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266 bool next_token_is_assign_op (void);
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267
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268 bool next_token_is_index_op (void);
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269
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diff changeset
270 int handle_close_bracket (bool spc_gobbled, int bracket_type);
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271
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272 void maybe_unput_comma (int spc_gobbled);
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273
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274 bool next_token_can_follow_bin_op (void);
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275
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276 bool looks_like_command_arg (void);
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277
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278 int handle_superclass_identifier (void);
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279
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diff changeset
280 int handle_meta_identifier (void);
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281
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282 int handle_identifier (void);
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283
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284 void maybe_warn_separator_insert (char sep);
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285
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286 void gripe_single_quote_string (void);
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287
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288 void gripe_matlab_incompatible (const std::string& msg);
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289
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290 void maybe_gripe_matlab_incompatible_comment (char c);
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291
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292 void gripe_matlab_incompatible_continuation (void);
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293
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294 void gripe_matlab_incompatible_operator (const std::string& op);
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295
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296 void push_token (token *);
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297
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298 token *current_token (void);
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299
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300 void display_token (int tok);
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301
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302 void fatal_error (const char *msg);
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303
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304 void lexer_debug (const char *pattern, const char *text);
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305
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306 // Internal state of the flex-generated lexer.
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307 void *scanner;
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308
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309 // TRUE means that we have encountered EOF on the input stream.
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310 bool end_of_input;
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311
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312 // TRUE means that we should convert spaces to a comma inside a
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313 // matrix definition.
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314 bool convert_spaces_to_comma;
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315
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316 // GAG. Stupid kludge so that [[1,2][3,4]] will work.
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317 bool do_comma_insert;
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318
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319 // TRUE means we are at the beginning of a statement, where a
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320 // command name is possible.
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321 bool at_beginning_of_statement;
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322
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323 // TRUE means we are parsing an anonymous function argument list.
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324 bool looking_at_anon_fcn_args;
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325
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326 // TRUE means we're parsing the return list for a function.
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327 bool looking_at_return_list;
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328
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329 // TRUE means we're parsing the parameter list for a function.
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330 bool looking_at_parameter_list;
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331
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332 // TRUE means we're parsing a declaration list (global or
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333 // persistent).
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334 bool looking_at_decl_list;
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335
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336 // TRUE means we are looking at the initializer expression for a
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337 // parameter list element.
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338 bool looking_at_initializer_expression;
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339
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340 // TRUE means we're parsing a matrix or the left hand side of
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341 // multi-value assignment statement.
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342 bool looking_at_matrix_or_assign_lhs;
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343
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344 // Object index not possible until we've seen something.
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345 bool looking_for_object_index;
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346
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347 // TRUE means we're looking at an indirect reference to a
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348 // structure element.
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349 bool looking_at_indirect_ref;
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350
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351 // TRUE means we are parsing a class method in function or classdef file.
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352 bool parsing_class_method;
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353
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354 // TRUE means we are parsing a class method declaration line in a
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Ryan Rusaw
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355 // classdef file and can accept a property get or set method name.
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356 // For example, "get.PropertyName" is recognized as a function name.
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357 bool maybe_classdef_get_set_method;
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358
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359 // TRUE means we are parsing a classdef file
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360 bool parsing_classdef;
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361
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362 // Return transpose or start a string?
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363 bool quote_is_transpose;
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364
16103
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diff changeset
365 // The current input line number.
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366 int input_line_number;
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367
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diff changeset
368 // The column of the current token.
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369 int current_input_column;
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370
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371 // Square bracket level count.
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372 int bracketflag;
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373
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374 // Curly brace level count.
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375 int braceflag;
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376
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377 // TRUE means we're in the middle of defining a loop.
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378 int looping;
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379
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380 // Nonzero means we're in the middle of defining a function.
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diff changeset
381 int defining_func;
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382
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383 // Nonzero means we are parsing a function handle.
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diff changeset
384 int looking_at_function_handle;
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diff changeset
385
16105
b7de58feb2d3 move block_comment_nesting_level to lexical_feedback_class
John W. Eaton <jwe@octave.org>
parents: 16104
diff changeset
386 // Nestng level for blcok comments.
b7de58feb2d3 move block_comment_nesting_level to lexical_feedback_class
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parents: 16104
diff changeset
387 int block_comment_nesting_level;
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John W. Eaton <jwe@octave.org>
parents: 16104
diff changeset
388
16100
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389 // If the front of the list is TRUE, the closest paren, brace, or
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diff changeset
390 // bracket nesting is an index for an object.
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diff changeset
391 std::list<bool> looking_at_object_index;
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diff changeset
392
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diff changeset
393 // If the top of the stack is TRUE, then we've already seen the name
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diff changeset
394 // of the current function. Should only matter if
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diff changeset
395 // current_function_level > 0
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diff changeset
396 std::stack<bool> parsed_function_name;
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diff changeset
397
8001
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parents: 7723
diff changeset
398 // Set of identifiers that might be local variable names.
ff9e7873f8ea improve handling of command-style names in matrix_or_assign_lhs context
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parents: 7723
diff changeset
399 std::set<std::string> pending_local_variables;
16104
c8974e28da59 move nesting_level to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16103
diff changeset
400
c8974e28da59 move nesting_level to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16103
diff changeset
401 // Is the closest nesting level a square bracket, squiggly brace or
c8974e28da59 move nesting_level to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16103
diff changeset
402 // a paren?
c8974e28da59 move nesting_level to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16103
diff changeset
403 bbp_nesting_level nesting_level;
16110
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John W. Eaton <jwe@octave.org>
parents: 16107
diff changeset
404
16183
359d56094efa handle lexer input buffering with class
John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
405 // Object that reads and buffers input.
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parents: 16164
diff changeset
406 input_buffer input_buf;
359d56094efa handle lexer input buffering with class
John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
407
16126
5c885c13bfa3 localize use of yylval.tok_val in lexical_feedback member functions
John W. Eaton <jwe@octave.org>
parents: 16125
diff changeset
408 // For unwind protect.
16158
7eb614760ddb rename lexical_feedback to octave_lexer
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parents: 16149
diff changeset
409 static void cleanup (octave_lexer *lexer) { delete lexer; }
16126
5c885c13bfa3 localize use of yylval.tok_val in lexical_feedback member functions
John W. Eaton <jwe@octave.org>
parents: 16125
diff changeset
410
5c885c13bfa3 localize use of yylval.tok_val in lexical_feedback member functions
John W. Eaton <jwe@octave.org>
parents: 16125
diff changeset
411 private:
5c885c13bfa3 localize use of yylval.tok_val in lexical_feedback member functions
John W. Eaton <jwe@octave.org>
parents: 16125
diff changeset
412
16111
3ec4f6488569 move token stack to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16110
diff changeset
413 // Stack to hold tokens so that we can delete them when the parser is
3ec4f6488569 move token stack to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16110
diff changeset
414 // reset and avoid growing forever just because we are stashing some
3ec4f6488569 move token stack to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16110
diff changeset
415 // information.
3ec4f6488569 move token stack to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16110
diff changeset
416 std::stack <token*> token_stack;
3ec4f6488569 move token stack to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16110
diff changeset
417
16110
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John W. Eaton <jwe@octave.org>
parents: 16107
diff changeset
418 // No copying!
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parents: 16107
diff changeset
419
16158
7eb614760ddb rename lexical_feedback to octave_lexer
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parents: 16149
diff changeset
420 octave_lexer (const octave_lexer&);
16110
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parents: 16107
diff changeset
421
16158
7eb614760ddb rename lexical_feedback to octave_lexer
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diff changeset
422 octave_lexer& operator = (const octave_lexer&);
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diff changeset
423 };
b14829582cc4 [project @ 1996-02-02 03:05:07 by jwe]
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diff changeset
424
1
78fd87e624cb [project @ 1993-08-08 01:13:40 by jwe]
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parents:
diff changeset
425 #endif