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 | * (c) Fabien Potencier <fabien@symfony.com> |
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6 | * |
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7 | * For the full copyright and license information, please view the LICENSE |
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8 | * file that was distributed with this source code. |
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9 | */ |
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10 | |
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11 | namespace Symfony\Component\Yaml; |
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12 | |
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13 | use Symfony\Component\Yaml\Exception\ParseException; |
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14 | |
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15 | /** |
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16 | * Parser parses YAML strings to convert them to PHP arrays. |
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17 | * |
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18 | * @author Fabien Potencier <fabien@symfony.com> |
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19 | */ |
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20 | class Parser |
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21 | { |
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22 | private $offset = 0; |
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23 | private $lines = array(); |
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24 | private $currentLineNb = -1; |
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25 | private $currentLine = ''; |
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26 | private $refs = array(); |
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27 | |
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28 | /** |
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29 | * Constructor |
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30 | * |
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31 | * @param integer $offset The offset of YAML document (used for line numbers in error messages) |
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32 | */ |
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33 | public function __construct($offset = 0) |
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34 | { |
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35 | $this->offset = $offset; |
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36 | } |
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37 | |
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38 | /** |
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39 | * Parses a YAML string to a PHP value. |
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40 | * |
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41 | * @param string $value A YAML string |
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42 | * |
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43 | * @return mixed A PHP value |
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44 | * |
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45 | * @throws ParseException If the YAML is not valid |
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46 | */ |
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47 | public function parse($value) |
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48 | { |
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49 | $this->currentLineNb = -1; |
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50 | $this->currentLine = ''; |
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51 | $this->lines = explode("\n", $this->cleanup($value)); |
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52 | |
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53 | if (function_exists('mb_detect_encoding') && false === mb_detect_encoding($value, 'UTF-8', true)) { |
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54 | throw new ParseException('The YAML value does not appear to be valid UTF-8.'); |
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55 | } |
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56 | |
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57 | if (function_exists('mb_internal_encoding') && ((int) ini_get('mbstring.func_overload')) & 2) { |
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58 | $mbEncoding = mb_internal_encoding(); |
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59 | mb_internal_encoding('UTF-8'); |
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60 | } |
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61 | |
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62 | $data = array(); |
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63 | while ($this->moveToNextLine()) { |
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64 | if ($this->isCurrentLineEmpty()) { |
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65 | continue; |
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66 | } |
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67 | |
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68 | // tab? |
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69 | if (preg_match('#^\t+#', $this->currentLine)) { |
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70 | throw new ParseException('A YAML file cannot contain tabs as indentation.', $this->getRealCurrentLineNb() + 1, $this->currentLine); |
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71 | } |
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72 | |
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73 | $isRef = $isInPlace = $isProcessed = false; |
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74 | if (preg_match('#^\-((?P<leadspaces>\s+)(?P<value>.+?))?\s*$#u', $this->currentLine, $values)) { |
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75 | if (isset($values['value']) && preg_match('#^&(?P<ref>[^ ]+) *(?P<value>.*)#u', $values['value'], $matches)) { |
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76 | $isRef = $matches['ref']; |
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77 | $values['value'] = $matches['value']; |
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78 | } |
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79 | |
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80 | // array |
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81 | if (!isset($values['value']) || '' == trim($values['value'], ' ') || 0 === strpos(ltrim($values['value'], ' '), '#')) { |
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82 | $c = $this->getRealCurrentLineNb() + 1; |
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83 | $parser = new Parser($c); |
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84 | $parser->refs =& $this->refs; |
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85 | $data[] = $parser->parse($this->getNextEmbedBlock()); |
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86 | } else { |
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87 | if (isset($values['leadspaces']) |
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88 | && ' ' == $values['leadspaces'] |
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89 | && preg_match('#^(?P<key>'.Inline::REGEX_QUOTED_STRING.'|[^ \'"\{\[].*?) *\:(\s+(?P<value>.+?))?\s*$#u', $values['value'], $matches) |
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90 | ) { |
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91 | // this is a compact notation element, add to next block and parse |
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92 | $c = $this->getRealCurrentLineNb(); |
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93 | $parser = new Parser($c); |
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94 | $parser->refs =& $this->refs; |
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95 | |
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96 | $block = $values['value']; |
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97 | if (!$this->isNextLineIndented()) { |
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98 | $block .= "\n".$this->getNextEmbedBlock($this->getCurrentLineIndentation() + 2); |
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99 | } |
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100 | |
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101 | $data[] = $parser->parse($block); |
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102 | } else { |
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103 | $data[] = $this->parseValue($values['value']); |
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104 | } |
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105 | } |
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106 | } else if (preg_match('#^(?P<key>'.Inline::REGEX_QUOTED_STRING.'|[^ \'"\[\{].*?) *\:(\s+(?P<value>.+?))?\s*$#u', $this->currentLine, $values)) { |
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107 | try { |
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108 | $key = Inline::parseScalar($values['key']); |
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109 | } catch (ParseException $e) { |
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110 | $e->setParsedLine($this->getRealCurrentLineNb() + 1); |
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111 | $e->setSnippet($this->currentLine); |
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112 | |
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113 | throw $e; |
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114 | } |
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115 | |
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116 | if ('<<' === $key) { |
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117 | if (isset($values['value']) && '*' === substr($values['value'], 0, 1)) { |
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118 | $isInPlace = substr($values['value'], 1); |
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119 | if (!array_key_exists($isInPlace, $this->refs)) { |
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120 | throw new ParseException(sprintf('Reference "%s" does not exist.', $isInPlace), $this->getRealCurrentLineNb() + 1, $this->currentLine); |
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121 | } |
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122 | } else { |
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123 | if (isset($values['value']) && $values['value'] !== '') { |
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124 | $value = $values['value']; |
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125 | } else { |
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126 | $value = $this->getNextEmbedBlock(); |
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127 | } |
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128 | $c = $this->getRealCurrentLineNb() + 1; |
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129 | $parser = new Parser($c); |
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130 | $parser->refs =& $this->refs; |
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131 | $parsed = $parser->parse($value); |
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132 | |
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133 | $merged = array(); |
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134 | if (!is_array($parsed)) { |
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135 | throw new ParseException('YAML merge keys used with a scalar value instead of an array.', $this->getRealCurrentLineNb() + 1, $this->currentLine); |
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136 | } else if (isset($parsed[0])) { |
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137 | // Numeric array, merge individual elements |
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138 | foreach (array_reverse($parsed) as $parsedItem) { |
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139 | if (!is_array($parsedItem)) { |
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140 | throw new ParseException('Merge items must be arrays.', $this->getRealCurrentLineNb() + 1, $parsedItem); |
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141 | } |
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142 | $merged = array_merge($parsedItem, $merged); |
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143 | } |
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144 | } else { |
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145 | // Associative array, merge |
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146 | $merged = array_merge($merged, $parsed); |
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147 | } |
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148 | |
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149 | $isProcessed = $merged; |
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150 | } |
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151 | } else if (isset($values['value']) && preg_match('#^&(?P<ref>[^ ]+) *(?P<value>.*)#u', $values['value'], $matches)) { |
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152 | $isRef = $matches['ref']; |
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153 | $values['value'] = $matches['value']; |
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154 | } |
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155 | |
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156 | if ($isProcessed) { |
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157 | // Merge keys |
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158 | $data = $isProcessed; |
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159 | // hash |
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160 | } else if (!isset($values['value']) || '' == trim($values['value'], ' ') || 0 === strpos(ltrim($values['value'], ' '), '#')) { |
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161 | // if next line is less indented or equal, then it means that the current value is null |
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162 | if ($this->isNextLineIndented()) { |
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163 | $data[$key] = null; |
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164 | } else { |
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165 | $c = $this->getRealCurrentLineNb() + 1; |
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166 | $parser = new Parser($c); |
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167 | $parser->refs =& $this->refs; |
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168 | $data[$key] = $parser->parse($this->getNextEmbedBlock()); |
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169 | } |
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170 | } else { |
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171 | if ($isInPlace) { |
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172 | $data = $this->refs[$isInPlace]; |
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173 | } else { |
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174 | $data[$key] = $this->parseValue($values['value']); |
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175 | } |
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176 | } |
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177 | } else { |
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178 | // 1-liner followed by newline |
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179 | if (2 == count($this->lines) && empty($this->lines[1])) { |
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180 | try { |
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181 | $value = Inline::parse($this->lines[0]); |
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182 | } catch (ParseException $e) { |
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183 | $e->setParsedLine($this->getRealCurrentLineNb() + 1); |
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184 | $e->setSnippet($this->currentLine); |
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185 | |
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186 | throw $e; |
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187 | } |
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188 | |
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189 | if (is_array($value)) { |
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190 | $first = reset($value); |
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191 | if (is_string($first) && '*' === substr($first, 0, 1)) { |
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192 | $data = array(); |
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193 | foreach ($value as $alias) { |
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194 | $data[] = $this->refs[substr($alias, 1)]; |
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195 | } |
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196 | $value = $data; |
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197 | } |
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198 | } |
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199 | |
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200 | if (isset($mbEncoding)) { |
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201 | mb_internal_encoding($mbEncoding); |
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202 | } |
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203 | |
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204 | return $value; |
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205 | } |
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206 | |
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207 | switch (preg_last_error()) { |
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208 | case PREG_INTERNAL_ERROR: |
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209 | $error = 'Internal PCRE error.'; |
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210 | break; |
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211 | case PREG_BACKTRACK_LIMIT_ERROR: |
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212 | $error = 'pcre.backtrack_limit reached.'; |
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213 | break; |
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214 | case PREG_RECURSION_LIMIT_ERROR: |
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215 | $error = 'pcre.recursion_limit reached.'; |
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216 | break; |
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217 | case PREG_BAD_UTF8_ERROR: |
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218 | $error = 'Malformed UTF-8 data.'; |
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219 | break; |
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220 | case PREG_BAD_UTF8_OFFSET_ERROR: |
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221 | $error = 'Offset doesn\'t correspond to the begin of a valid UTF-8 code point.'; |
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222 | break; |
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223 | default: |
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224 | $error = 'Unable to parse.'; |
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225 | } |
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226 | |
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227 | throw new ParseException($error, $this->getRealCurrentLineNb() + 1, $this->currentLine); |
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228 | } |
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229 | |
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230 | if ($isRef) { |
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231 | $this->refs[$isRef] = end($data); |
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232 | } |
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233 | } |
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234 | |
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235 | if (isset($mbEncoding)) { |
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236 | mb_internal_encoding($mbEncoding); |
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237 | } |
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238 | |
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239 | return empty($data) ? null : $data; |
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240 | } |
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241 | |
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242 | /** |
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243 | * Returns the current line number (takes the offset into account). |
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244 | * |
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245 | * @return integer The current line number |
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246 | */ |
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247 | private function getRealCurrentLineNb() |
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248 | { |
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249 | return $this->currentLineNb + $this->offset; |
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250 | } |
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251 | |
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252 | /** |
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253 | * Returns the current line indentation. |
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254 | * |
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255 | * @return integer The current line indentation |
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256 | */ |
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257 | private function getCurrentLineIndentation() |
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258 | { |
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259 | return strlen($this->currentLine) - strlen(ltrim($this->currentLine, ' ')); |
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260 | } |
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261 | |
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262 | /** |
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263 | * Returns the next embed block of YAML. |
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264 | * |
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265 | * @param integer $indentation The indent level at which the block is to be read, or null for default |
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266 | * |
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267 | * @return string A YAML string |
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268 | * |
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269 | * @throws ParseException When indentation problem are detected |
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270 | */ |
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271 | private function getNextEmbedBlock($indentation = null) |
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272 | { |
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273 | $this->moveToNextLine(); |
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274 | |
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275 | if (null === $indentation) { |
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276 | $newIndent = $this->getCurrentLineIndentation(); |
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277 | |
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278 | if (!$this->isCurrentLineEmpty() && 0 == $newIndent) { |
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279 | throw new ParseException('Indentation problem.', $this->getRealCurrentLineNb() + 1, $this->currentLine); |
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280 | } |
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281 | } else { |
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282 | $newIndent = $indentation; |
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283 | } |
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284 | |
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285 | $data = array(substr($this->currentLine, $newIndent)); |
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286 | |
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287 | while ($this->moveToNextLine()) { |
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288 | if ($this->isCurrentLineEmpty()) { |
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289 | if ($this->isCurrentLineBlank()) { |
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290 | $data[] = substr($this->currentLine, $newIndent); |
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291 | } |
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292 | |
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293 | continue; |
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294 | } |
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295 | |
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296 | $indent = $this->getCurrentLineIndentation(); |
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297 | |
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298 | if (preg_match('#^(?P<text> *)$#', $this->currentLine, $match)) { |
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299 | // empty line |
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300 | $data[] = $match['text']; |
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301 | } else if ($indent >= $newIndent) { |
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302 | $data[] = substr($this->currentLine, $newIndent); |
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303 | } else if (0 == $indent) { |
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304 | $this->moveToPreviousLine(); |
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305 | |
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306 | break; |
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307 | } else { |
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308 | throw new ParseException('Indentation problem.', $this->getRealCurrentLineNb() + 1, $this->currentLine); |
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309 | } |
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310 | } |
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311 | |
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312 | return implode("\n", $data); |
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313 | } |
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314 | |
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315 | /** |
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316 | * Moves the parser to the next line. |
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317 | * |
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318 | * @return Boolean |
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319 | */ |
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320 | private function moveToNextLine() |
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321 | { |
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322 | if ($this->currentLineNb >= count($this->lines) - 1) { |
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323 | return false; |
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324 | } |
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325 | |
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326 | $this->currentLine = $this->lines[++$this->currentLineNb]; |
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327 | |
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328 | return true; |
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329 | } |
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330 | |
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331 | /** |
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332 | * Moves the parser to the previous line. |
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333 | */ |
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334 | private function moveToPreviousLine() |
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335 | { |
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336 | $this->currentLine = $this->lines[--$this->currentLineNb]; |
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337 | } |
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338 | |
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339 | /** |
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340 | * Parses a YAML value. |
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341 | * |
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342 | * @param string $value A YAML value |
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343 | * |
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344 | * @return mixed A PHP value |
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345 | * |
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346 | * @throws ParseException When reference does not exist |
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347 | */ |
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348 | private function parseValue($value) |
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349 | { |
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350 | if ('*' === substr($value, 0, 1)) { |
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351 | if (false !== $pos = strpos($value, '#')) { |
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352 | $value = substr($value, 1, $pos - 2); |
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353 | } else { |
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354 | $value = substr($value, 1); |
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355 | } |
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356 | |
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357 | if (!array_key_exists($value, $this->refs)) { |
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358 | throw new ParseException(sprintf('Reference "%s" does not exist.', $value), $this->currentLine); |
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359 | } |
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360 | |
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361 | return $this->refs[$value]; |
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362 | } |
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363 | |
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364 | if (preg_match('/^(?P<separator>\||>)(?P<modifiers>\+|\-|\d+|\+\d+|\-\d+|\d+\+|\d+\-)?(?P<comments> +#.*)?$/', $value, $matches)) { |
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365 | $modifiers = isset($matches['modifiers']) ? $matches['modifiers'] : ''; |
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366 | |
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367 | return $this->parseFoldedScalar($matches['separator'], preg_replace('#\d+#', '', $modifiers), intval(abs($modifiers))); |
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368 | } |
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369 | |
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370 | try { |
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371 | return Inline::parse($value); |
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372 | } catch (ParseException $e) { |
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373 | $e->setParsedLine($this->getRealCurrentLineNb() + 1); |
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374 | $e->setSnippet($this->currentLine); |
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375 | |
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376 | throw $e; |
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377 | } |
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378 | } |
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379 | |
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380 | /** |
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381 | * Parses a folded scalar. |
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382 | * |
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383 | * @param string $separator The separator that was used to begin this folded scalar (| or >) |
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384 | * @param string $indicator The indicator that was used to begin this folded scalar (+ or -) |
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385 | * @param integer $indentation The indentation that was used to begin this folded scalar |
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386 | * |
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387 | * @return string The text value |
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388 | */ |
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389 | private function parseFoldedScalar($separator, $indicator = '', $indentation = 0) |
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390 | { |
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391 | $separator = '|' == $separator ? "\n" : ' '; |
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392 | $text = ''; |
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393 | |
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394 | $notEOF = $this->moveToNextLine(); |
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395 | |
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396 | while ($notEOF && $this->isCurrentLineBlank()) { |
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397 | $text .= "\n"; |
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398 | |
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399 | $notEOF = $this->moveToNextLine(); |
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400 | } |
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401 | |
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402 | if (!$notEOF) { |
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403 | return ''; |
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404 | } |
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405 | |
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406 | if (!preg_match('#^(?P<indent>'.($indentation ? str_repeat(' ', $indentation) : ' +').')(?P<text>.*)$#u', $this->currentLine, $matches)) { |
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407 | $this->moveToPreviousLine(); |
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408 | |
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409 | return ''; |
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410 | } |
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411 | |
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412 | $textIndent = $matches['indent']; |
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413 | $previousIndent = 0; |
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414 | |
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415 | $text .= $matches['text'].$separator; |
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416 | while ($this->currentLineNb + 1 < count($this->lines)) { |
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417 | $this->moveToNextLine(); |
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418 | |
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419 | if (preg_match('#^(?P<indent> {'.strlen($textIndent).',})(?P<text>.+)$#u', $this->currentLine, $matches)) { |
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420 | if (' ' == $separator && $previousIndent != $matches['indent']) { |
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421 | $text = substr($text, 0, -1)."\n"; |
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422 | } |
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423 | $previousIndent = $matches['indent']; |
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424 | |
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425 | $text .= str_repeat(' ', $diff = strlen($matches['indent']) - strlen($textIndent)).$matches['text'].($diff ? "\n" : $separator); |
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426 | } else if (preg_match('#^(?P<text> *)$#', $this->currentLine, $matches)) { |
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427 | $text .= preg_replace('#^ {1,'.strlen($textIndent).'}#', '', $matches['text'])."\n"; |
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428 | } else { |
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429 | $this->moveToPreviousLine(); |
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430 | |
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431 | break; |
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432 | } |
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433 | } |
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434 | |
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435 | if (' ' == $separator) { |
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436 | // replace last separator by a newline |
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437 | $text = preg_replace('/ (\n*)$/', "\n$1", $text); |
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438 | } |
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439 | |
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440 | switch ($indicator) { |
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441 | case '': |
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442 | $text = preg_replace('#\n+$#s', "\n", $text); |
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443 | break; |
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444 | case '+': |
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445 | break; |
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446 | case '-': |
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447 | $text = preg_replace('#\n+$#s', '', $text); |
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448 | break; |
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449 | } |
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450 | |
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451 | return $text; |
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452 | } |
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453 | |
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454 | /** |
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455 | * Returns true if the next line is indented. |
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456 | * |
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457 | * @return Boolean Returns true if the next line is indented, false otherwise |
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458 | */ |
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459 | private function isNextLineIndented() |
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460 | { |
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461 | $currentIndentation = $this->getCurrentLineIndentation(); |
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462 | $notEOF = $this->moveToNextLine(); |
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463 | |
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464 | while ($notEOF && $this->isCurrentLineEmpty()) { |
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465 | $notEOF = $this->moveToNextLine(); |
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466 | } |
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467 | |
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468 | if (false === $notEOF) { |
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469 | return false; |
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470 | } |
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471 | |
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472 | $ret = false; |
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473 | if ($this->getCurrentLineIndentation() <= $currentIndentation) { |
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474 | $ret = true; |
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475 | } |
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476 | |
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477 | $this->moveToPreviousLine(); |
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478 | |
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479 | return $ret; |
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480 | } |
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481 | |
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482 | /** |
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483 | * Returns true if the current line is blank or if it is a comment line. |
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484 | * |
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485 | * @return Boolean Returns true if the current line is empty or if it is a comment line, false otherwise |
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486 | */ |
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487 | private function isCurrentLineEmpty() |
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488 | { |
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489 | return $this->isCurrentLineBlank() || $this->isCurrentLineComment(); |
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490 | } |
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491 | |
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492 | /** |
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493 | * Returns true if the current line is blank. |
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494 | * |
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495 | * @return Boolean Returns true if the current line is blank, false otherwise |
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496 | */ |
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497 | private function isCurrentLineBlank() |
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498 | { |
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499 | return '' == trim($this->currentLine, ' '); |
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500 | } |
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501 | |
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502 | /** |
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503 | * Returns true if the current line is a comment line. |
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504 | * |
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505 | * @return Boolean Returns true if the current line is a comment line, false otherwise |
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506 | */ |
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507 | private function isCurrentLineComment() |
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508 | { |
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509 | //checking explicitly the first char of the trim is faster than loops or strpos |
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510 | $ltrimmedLine = ltrim($this->currentLine, ' '); |
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511 | |
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512 | return $ltrimmedLine[0] === '#'; |
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513 | } |
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514 | |
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515 | /** |
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516 | * Cleanups a YAML string to be parsed. |
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517 | * |
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518 | * @param string $value The input YAML string |
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519 | * |
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520 | * @return string A cleaned up YAML string |
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521 | */ |
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522 | private function cleanup($value) |
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523 | { |
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524 | $value = str_replace(array("\r\n", "\r"), "\n", $value); |
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525 | |
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526 | if (!preg_match("#\n$#", $value)) { |
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527 | $value .= "\n"; |
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528 | } |
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529 | |
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530 | // strip YAML header |
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531 | $count = 0; |
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532 | $value = preg_replace('#^\%YAML[: ][\d\.]+.*\n#su', '', $value, -1, $count); |
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533 | $this->offset += $count; |
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534 | |
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535 | // remove leading comments |
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536 | $trimmedValue = preg_replace('#^(\#.*?\n)+#s', '', $value, -1, $count); |
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537 | if ($count == 1) { |
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538 | // items have been removed, update the offset |
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539 | $this->offset += substr_count($value, "\n") - substr_count($trimmedValue, "\n"); |
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540 | $value = $trimmedValue; |
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541 | } |
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542 | |
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543 | // remove start of the document marker (---) |
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544 | $trimmedValue = preg_replace('#^\-\-\-.*?\n#s', '', $value, -1, $count); |
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545 | if ($count == 1) { |
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546 | // items have been removed, update the offset |
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547 | $this->offset += substr_count($value, "\n") - substr_count($trimmedValue, "\n"); |
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548 | $value = $trimmedValue; |
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549 | |
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550 | // remove end of the document marker (...) |
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551 | $value = preg_replace('#\.\.\.\s*$#s', '', $value); |
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552 | } |
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553 | |
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554 | return $value; |
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555 | } |
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556 | } |
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