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annotate libinterp/corefcn/textscan.h @ 21490:243b04c97b56

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textscan: Use references rather than pointers to stream objects * textscan.cc, textscan.h (textscan::scan, textscan::do_scan): Accept a reference to a std::istream rather than a pointer. (Ftextscan): Pass streams by reference.
author Mike Miller <mtmiller@octave.org>
date Fri, 18 Mar 2016 16:36:40 -0700
parents 9dbc8f8bc2d7
children ab0a19882615
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2
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3 Copyright (C) 2015-2016 Lachlan Andrew, Monash University
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4
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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 // @file
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24 // Implementation of textscan, a versatile text parser.
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25
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26 #if ! defined (octave_textscan_h)
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27 #define octave_textscan_h 1
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28
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29 #include "octave-config.h"
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30
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31 #include <iosfwd>
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32 #include <list>
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33 #include <string>
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34
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35 // These are only needed as arguments to private functions, so they
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36 // are also treated as private.
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37
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38 class delimited_stream;
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39 class textscan_format_elt;
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40 class textscan_format_list;
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41
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42 #include "Cell.h"
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43 #include "ov.h"
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44 #include "ovl.h"
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45
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46 // Main class to implement textscan. Read data and parse it
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47 // according to a format.
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48 //
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49 // The calling sequence is
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50 //
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51 // textscan scanner ();
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52 // scanner.scan (...);
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53
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54 class
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55 OCTINTERP_API
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56 textscan
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57 {
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58 public:
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59
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60 textscan (void);
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61
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62 ~textscan (void) { }
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63
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64 octave_value scan (std::istream& isp, const octave_value_list& args);
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65
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66 private:
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67
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68 friend class textscan_format_list;
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69
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70 std::string buf;
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71
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72 // Three cases for delim_table and delim_list
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73 // 1. delim_table empty, delim_list empty: whitespace delimiters
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74 // 2. delim_table = look-up table of delim chars, delim_list empty.
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75 // 3. delim_table non-empty, delim_list = Cell array of delim strings
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76
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77 std::string whitespace_table;
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78
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79 // delim_table[i] == '\0' if i is not a delimiter.
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80 std::string delim_table;
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81
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82 // String of delimiter characters.
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83 std::string delims;
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84
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85 Cell comment_style;
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86
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87 // How far ahead to look to detect an open comment.
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88 int comment_len;
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89
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90 // First character of open comment.
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91 int comment_char;
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92
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93 octave_idx_type buffer_size;
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94
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95 std::string date_locale;
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96
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97 // 'inf' and 'nan' for formatted_double.
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98 Cell inf_nan;
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99
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100 // Array of strings of delimiters.
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101 Cell delim_list;
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102
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103 // Longest delimiter.
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104 int delim_len;
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105
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106 octave_value empty_value;
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107 std::string exp_chars;
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108 int header_lines;
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109 Cell treat_as_empty;
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110
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111 // Longest string to treat as "N/A".
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112 int treat_as_empty_len;
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113
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114 std::string whitespace;
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115
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116 short eol1;
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117 short eol2;
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118 short return_on_error;
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119
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120 bool collect_output;
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121 bool multiple_delims_as_one;
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122 bool default_exp;
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123 bool numeric_delim;
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124
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125 octave_idx_type lines;
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126
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127 octave_value do_scan (std::istream& isp, textscan_format_list& fmt_list,
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128 octave_idx_type ntimes);
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129
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130 void parse_options (const octave_value_list& args,
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131 textscan_format_list& fmt_list);
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132
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133 int read_format_once (delimited_stream &isp, textscan_format_list& fmt_list,
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134 std::list<octave_value> & retval,
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135 Array<octave_idx_type> row, int& done_after);
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136
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137 void scan_one (delimited_stream& is, const textscan_format_elt& fmt,
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138 octave_value& ov, Array<octave_idx_type> row);
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139
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140 // Methods to process a particular conversion specifier.
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141 double read_double (delimited_stream& is,
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142 const textscan_format_elt& fmt) const;
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143
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144 void scan_complex (delimited_stream& is, const textscan_format_elt& fmt,
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145 Complex& val) const;
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146
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147 int scan_bracket (delimited_stream& is, const char *pattern,
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148 std::string& val) const;
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149
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150 int scan_caret (delimited_stream& is, const char *, std::string& val) const;
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151
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152 void scan_string (delimited_stream& is, const textscan_format_elt& fmt,
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153 std::string& val) const;
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154
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155 void scan_cstring (delimited_stream& is, const textscan_format_elt& fmt,
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156 std::string& val) const;
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157
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158 void scan_qstring (delimited_stream& is, const textscan_format_elt& fmt,
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159 std::string& val);
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160
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161 // Helper methods.
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162 std::string read_until (delimited_stream& is, const Cell& delimiters,
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163 const std::string& ends) const;
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164
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165 int lookahead (delimited_stream& is, const Cell& targets, int max_len,
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166 bool case_sensitive = true) const;
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167
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168 char *get_field (delimited_stream& isp, unsigned int width) const;
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169
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170 bool match_literal (delimited_stream& isp, const textscan_format_elt& elem);
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171
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172 int skip_whitespace (delimited_stream& is, bool EOLstop = false);
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173
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174 int skip_delim (delimited_stream& is);
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175
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176 bool is_delim (unsigned char ch) const
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177 {
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178 return ((delim_table.length () == 0
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179 && (isspace (ch) || ch == eol1 || ch == eol2))
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180 || delim_table[ch] != '\0');
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181 }
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182
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183 bool isspace (unsigned int ch) const { return whitespace_table[ch & 0xff]; }
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184
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185 // True if the only delimiter is whitespace.
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186 bool whitespace_delim (void) const { return delim_table.length () == 0; }
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187
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188 // No copying!
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189
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190 textscan (const textscan&);
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191
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192 textscan& operator = (const textscan&);
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193 };
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194
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195 #endif