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1 <?php
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2
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3 /*
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4 * This file is part of the Symfony package.
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5 *
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6 * (c) Fabien Potencier <fabien@symfony.com>
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7 *
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8 * For the full copyright and license information, please view the LICENSE
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9 * file that was distributed with this source code.
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10 */
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11
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12 namespace Symfony\Component\Translation\Extractor;
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13
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14 /*
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15 * The following is derived from code at http://github.com/nikic/PHP-Parser
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16 *
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17 * Copyright (c) 2011 by Nikita Popov
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18 *
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19 * Some rights reserved.
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20 *
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21 * Redistribution and use in source and binary forms, with or without
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22 * modification, are permitted provided that the following conditions are
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23 * met:
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24 *
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25 * * Redistributions of source code must retain the above copyright
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26 * notice, this list of conditions and the following disclaimer.
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27 *
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28 * * Redistributions in binary form must reproduce the above
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29 * copyright notice, this list of conditions and the following
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30 * disclaimer in the documentation and/or other materials provided
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31 * with the distribution.
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32 *
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33 * * The names of the contributors may not be used to endorse or
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34 * promote products derived from this software without specific
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35 * prior written permission.
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36 *
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37 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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38 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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39 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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40 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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41 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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44 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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45 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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48 */
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49
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50 class PhpStringTokenParser
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51 {
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52 protected static $replacements = [
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53 '\\' => '\\',
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54 '$' => '$',
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55 'n' => "\n",
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56 'r' => "\r",
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57 't' => "\t",
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58 'f' => "\f",
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59 'v' => "\v",
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60 'e' => "\x1B",
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61 ];
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62
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63 /**
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64 * Parses a string token.
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65 *
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66 * @param string $str String token content
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67 *
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68 * @return string The parsed string
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69 */
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70 public static function parse($str)
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71 {
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72 $bLength = 0;
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73 if ('b' === $str[0]) {
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74 $bLength = 1;
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75 }
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76
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77 if ('\'' === $str[$bLength]) {
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78 return str_replace(
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79 ['\\\\', '\\\''],
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80 ['\\', '\''],
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81 substr($str, $bLength + 1, -1)
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82 );
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83 } else {
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84 return self::parseEscapeSequences(substr($str, $bLength + 1, -1), '"');
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85 }
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86 }
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87
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88 /**
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89 * Parses escape sequences in strings (all string types apart from single quoted).
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90 *
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91 * @param string $str String without quotes
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92 * @param string|null $quote Quote type
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93 *
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94 * @return string String with escape sequences parsed
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95 */
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96 public static function parseEscapeSequences($str, $quote)
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97 {
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98 if (null !== $quote) {
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99 $str = str_replace('\\'.$quote, $quote, $str);
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100 }
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101
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102 return preg_replace_callback(
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103 '~\\\\([\\\\$nrtfve]|[xX][0-9a-fA-F]{1,2}|[0-7]{1,3})~',
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104 [__CLASS__, 'parseCallback'],
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105 $str
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106 );
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107 }
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108
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109 private static function parseCallback($matches)
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110 {
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111 $str = $matches[1];
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112
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113 if (isset(self::$replacements[$str])) {
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114 return self::$replacements[$str];
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115 } elseif ('x' === $str[0] || 'X' === $str[0]) {
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116 return \chr(hexdec($str));
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117 } else {
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118 return \chr(octdec($str));
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119 }
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120 }
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121
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122 /**
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123 * Parses a constant doc string.
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124 *
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125 * @param string $startToken Doc string start token content (<<<SMTHG)
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126 * @param string $str String token content
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127 *
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128 * @return string Parsed string
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129 */
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130 public static function parseDocString($startToken, $str)
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131 {
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132 // strip last newline (thanks tokenizer for sticking it into the string!)
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133 $str = preg_replace('~(\r\n|\n|\r)$~', '', $str);
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134
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135 // nowdoc string
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136 if (false !== strpos($startToken, '\'')) {
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137 return $str;
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138 }
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139
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140 return self::parseEscapeSequences($str, null);
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141 }
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142 }
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