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annotate src/DLD-FUNCTIONS/str2double.cc @ 11586:12df7854fa7c

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strip trailing whitespace from source files
author John W. Eaton <jwe@octave.org>
date Thu, 20 Jan 2011 17:24:59 -0500
parents 01f703952eff
children 1d13679b587e
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1 /*
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2
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3 Copyright (C) 2010-2011 Jaroslav Hajek
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4 Copyright (C) 2010 VZLU Prague
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5
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6 This file is part of Octave.
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7
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8 Octave is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published by the
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10 Free Software Foundation; either version 3 of the License, or (at your
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11 option) any later version.
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12
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13 Octave is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with Octave; see the file COPYING. If not, see
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20 <http://www.gnu.org/licenses/>.
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21
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22 */
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23
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24 #ifdef HAVE_CONFIG_H
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25 #include <config.h>
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26 #endif
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27
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28 #include <string>
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29 #include <cctype>
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30 #include <sstream>
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31 #include <algorithm>
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32
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33 #include "lo-ieee.h"
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34
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35 #include "Cell.h"
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36 #include "ov.h"
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37 #include "defun-dld.h"
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38 #include "gripes.h"
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39 #include "utils.h"
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40
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41 static inline bool
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42 is_imag_unit (int c)
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43 { return c == 'i' || c == 'j'; }
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44
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45 static std::istringstream&
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46 single_num (std::istringstream& is, double& num)
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47 {
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48 char c = is.peek ();
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49 if (c == 'I')
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50 {
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51 // It's infinity.
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52 is.get ();
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53 char c1 = is.get (), c2 = is.get ();
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54 if (c1 == 'n' && c2 == 'f')
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55 {
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56 num = octave_Inf;
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57 is.peek (); // Sets eof bit.
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58 }
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59 else
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60 is.setstate (std::ios::failbit); // indicate that read has failed.
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61 }
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62 else if (c == 'N')
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63 {
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64 // It's NA or NaN
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65 is.get ();
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66 char c1 = is.get ();
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67 if (c1 == 'A')
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68 {
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69 num = octave_NA;
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70 is.peek (); // Sets eof bit.
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71 }
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72 else
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73 {
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74 char c2 = is.get ();
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75 if (c1 == 'a' && c2 == 'N')
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76 {
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77 num = octave_NaN;
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78 is.peek (); // Sets eof bit.
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79 }
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80 else
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81 is.setstate (std::ios::failbit); // indicate that read has failed.
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82 }
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83 }
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84 else
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85 is >> num;
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86
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87 return is;
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88 }
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89
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90 static std::istringstream&
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91 extract_num (std::istringstream& is, double& num, bool& imag, bool& have_sign)
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92 {
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93 have_sign = imag = false;
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94
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95 char c = is.peek ();
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96 bool negative = false;
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97
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98 // Accept leading sign.
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99 if (c == '+' || c == '-')
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100 {
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101 negative = c == '-';
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102 is.get ();
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103 c = is.peek ();
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104 have_sign = true;
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105 }
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106
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107 // It's i*num or just i.
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108 if (is_imag_unit (c))
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109 {
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110 c = is.get ();
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111 imag = true;
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112 char cn = is.peek ();
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113 if (cn == '*')
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114 {
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115 // Multiplier follows, we extract it as a number.
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116 is.get ();
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117 single_num (is, num);
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118 }
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119 else
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120 num = 1.0;
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121 }
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122 else
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123 {
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124 // It's num, num*i, or numi.
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125 single_num (is, num);
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126 if (is.good ())
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127 {
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128 c = is.peek ();
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129 if (c == '*')
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130 {
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131 is.get ();
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132 c = is.get ();
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133 if (is_imag_unit (c))
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134 {
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135 imag = true;
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136 is.peek ();
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137 }
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138 else
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139 is.setstate (std::ios::failbit); // indicate that read has failed.
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140 }
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141 else if (is_imag_unit (c))
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142 {
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143 imag = true;
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144 is.get ();
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145 is.peek ();
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146 }
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147 }
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148 }
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149
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150 if (negative)
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151 num = -num;
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152
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153 return is;
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154 }
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155
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156 static inline void
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157 set_component (Complex& c, double num, bool imag)
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158 {
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159 #if defined (HAVE_CXX_COMPLEX_SETTERS)
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160 if (imag)
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161 c.imag (num);
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162 else
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163 c.real (num);
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164 #elif defined (HAVE_CXX_COMPLEX_REFERENCE_ACCESSORS)
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165 if (imag)
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166 c.imag () = num;
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167 else
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168 c.real () = num;
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169 #else
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170 if (imag)
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171 c = Complex (c.real (), num);
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172 else
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173 c = Complex (num, c.imag ());
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174 #endif
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175 }
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176
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177 static Complex
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178 str2double1 (const std::string& str_arg)
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179 {
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180 Complex val (0.0, 0.0);
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181
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182 std::string str = str_arg;
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183
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184 std::string::iterator se = str.end ();
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185
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186 // Remove commas (thousand separators) and spaces.
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187 se = std::remove (str.begin (), se, ',');
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188 se = std::remove (str.begin (), se, ' ');
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189 str.erase (se, str.end ());
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190
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191 std::istringstream is (str);
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192 double num;
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193 bool i1, i2, s1, s2;
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194
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195 if (is.eof ())
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196 val = octave_NaN;
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197 else if (! extract_num (is, num, i1, s1))
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198 val = octave_NaN;
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199 else
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200 {
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201 set_component (val, num, i1);
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202
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203 if (! is.eof ())
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204 {
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205 if (! extract_num (is, num, i2, s2) || i1 == i2 || ! s2)
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206 val = octave_NaN;
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207 else
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208 set_component (val, num, i2);
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209 }
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210 }
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211
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212 return val;
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213 }
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214
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215 DEFUN_DLD (str2double, args, ,
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216 "-*- texinfo -*-\n\
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217 @deftypefn {Built-in Function} {} str2double (@var{s})\n\
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218 Convert a string to a real or complex number.\n\
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219 \n\
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220 The string must be in one of the following formats where\n\
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221 a and b are real numbers and the complex unit is 'i' or 'j':\n\
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222 \n\
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223 @itemize\n\
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224 @item a + bi\n\
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225 \n\
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226 @item a + b*i\n\
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227 \n\
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228 @item a + i*b\n\
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229 \n\
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230 @item bi + a\n\
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231 \n\
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232 @item b*i + a\n\
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233 \n\
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234 @item i*b + a\n\
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235 @end itemize\n\
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236 \n\
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237 If present, a and/or b are of the form [+-]d[,.]d[[eE][+-]d] where the\n\
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238 brackets indicate optional arguments and 'd' indicates zero or more\n\
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239 digits. The special input values @code{Inf}, @code{NaN}, and @code{NA} are\n\
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240 also accepted.\n\
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241 \n\
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242 @var{s} may also be a character matrix, in which case the conversion is\n\
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243 repeated for each row. Or @var{s} may be a cell array of strings, in which\n\
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244 case each element is converted and an array of the same dimensions is\n\
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245 returned.\n\
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246 \n\
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247 @code{str2double} can replace @code{str2num}, and it avoids the use of\n\
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248 @code{eval} on unknown data.\n\
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249 @seealso{str2num}\n\
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250 @end deftypefn")
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251 {
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252 octave_value retval;
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253
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254 if (args.length () == 1)
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255 {
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256 if (args(0).is_string ())
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257 {
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258 if (args(0).rows () == 1 && args(0).ndims () == 2)
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259 {
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260 retval = str2double1 (args(0).string_value ());
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261 }
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262 else
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263 {
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264 const string_vector sv = args(0).all_strings ();
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265 if (! error_state)
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266 retval = sv.map<Complex> (str2double1);
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267 }
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268 }
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269 else if (args(0).is_cellstr ())
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270 {
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271 Array<std::string> sa = args(0).cellstr_value ();
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272 retval = sa.map<Complex> (str2double1);
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273 }
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274 else
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275 gripe_wrong_type_arg ("str2double", args(0));
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276 }
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277 else
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278 print_usage ();
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279
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280 return retval;
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281 }
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282
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283 /*
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284
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285 %!assert (str2double ("1"), 1)
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286 %!assert (str2double ("-.1e-5"), -1e-6)
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287 %!assert (str2double ("1,222.5"), 1222.5)
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288 %!assert (str2double ("i"), i)
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289 %!assert (str2double ("2j"), 2i)
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290 %!assert (str2double ("2 + j"), 2+j)
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291 %!assert (str2double ("i*2 + 3"), 3+2i)
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292 %!assert (str2double (".5*i + 3.5"), 3.5+0.5i)
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293 %!assert (str2double ("1e-3 + i*.25"), 1e-3 + 0.25i)
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294 %!assert (str2double (["2 + j";"1.25e-3";"-05"]), [2+i; 1.25e-3; -5])
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295 %!assert (str2double ({"2 + j","1.25e-3","-05"}), [2+i, 1.25e-3, -5])
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296 %!assert (str2double ("Hello World"), NaN)
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297 %!assert (str2double ("NaN"), NaN)
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298 %!assert (str2double ("NA"), NA)
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299 %!assert (str2double ("Inf"), Inf)
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300 %!assert (str2double ("-Inf"), -Inf)
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301 %!assert (str2double ("Inf*i"), complex (0, Inf))
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302 %!assert (str2double ("NaN + Inf*i"), complex (NaN, Inf))
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303 %!assert (str2double ("Inf - Inf*i"), complex (Inf, -Inf))
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304 %!assert (str2double ("-i*NaN - Inf"), complex (-Inf, -NaN))
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305
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306 */