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<?php
/*
* This file is part of the symfony package.
* (c) Fabien Potencier <fabien.potencier@symfony-project.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
require_once(dirname(__FILE__).'/sfYamlInline.php');
if (!defined('PREG_BAD_UTF8_OFFSET_ERROR'))
{
define('PREG_BAD_UTF8_OFFSET_ERROR', 5);
}
/**
* sfYamlParser parses YAML strings to convert them to PHP arrays.
*
* @package symfony
* @subpackage yaml
* @author Fabien Potencier <fabien.potencier@symfony-project.com>
* @version SVN: $Id: sfYamlParser.class.php 10832 2008-08-13 07:46:08Z fabien $
*/
class sfYamlParser
{
protected
$value = '',
$offset = 0,
$lines = array(),
$currentLineNb = -1,
$currentLine = '',
$refs = array();
/**
* Constructor
*
* @param integer $offset The offset of YAML document (used for line numbers in error messages)
*/
public function __construct($offset = 0)
{
$this->offset = $offset;
}
/**
* Parses a YAML string to a PHP value.
*
* @param string $value A YAML string
*
* @return mixed A PHP value
*
* @throws InvalidArgumentException If the YAML is not valid
*/
public function parse($value)
{
$this->value = $this->cleanup($value);
$this->currentLineNb = -1;
$this->currentLine = '';
$this->lines = explode("\n", $this->value);
$data = array();
while ($this->moveToNextLine())
{
if ($this->isCurrentLineEmpty())
{
continue;
}
// tab?
if (preg_match('#^\t+#', $this->currentLine))
{
throw new InvalidArgumentException(sprintf('A YAML file cannot contain tabs as indentation at line %d (%s).', $this->getRealCurrentLineNb() + 1, $this->currentLine));
}
$isRef = $isInPlace = $isProcessed = false;
if (preg_match('#^\-(\s+(?P<value>.+?))?\s*$#', $this->currentLine, $values))
{
if (isset($values['value']) && preg_match('#^&(?P<ref>[^ ]+) *(?P<value>.*)#', $values['value'], $matches))
{
$isRef = $matches['ref'];
$values['value'] = $matches['value'];
}
// array
if (!isset($values['value']) || '' == trim($values['value'], ' ') || 0 === strpos(ltrim($values['value'], ' '), '#'))
{
$c = $this->getRealCurrentLineNb() + 1;
$parser = new sfYamlParser($c);
$parser->refs =& $this->refs;
$data[] = $parser->parse($this->getNextEmbedBlock());
}
else
{
if (preg_match('/^([^ ]+)\: +({.*?)$/', $values['value'], $matches))
{
$data[] = array($matches[1] => sfYamlInline::load($matches[2]));
}
else
{
$data[] = $this->parseValue($values['value']);
}
}
}
else if (preg_match('#^(?P<key>'.sfYamlInline::REGEX_QUOTED_STRING.'|[^ ].*?) *\:(\s+(?P<value>.+?))?\s*$#', $this->currentLine, $values))
{
$key = sfYamlInline::parseScalar($values['key']);
if ('<<' === $key)
{
if (isset($values['value']) && '*' === substr($values['value'], 0, 1))
{
$isInPlace = substr($values['value'], 1);
if (!array_key_exists($isInPlace, $this->refs))
{
throw new InvalidArgumentException(sprintf('Reference "%s" does not exist at line %s (%s).', $isInPlace, $this->getRealCurrentLineNb() + 1, $this->currentLine));
}
}
else
{
if (isset($values['value']) && $values['value'] !== '')
{
$value = $values['value'];
}
else
{
$value = $this->getNextEmbedBlock();
}
$c = $this->getRealCurrentLineNb() + 1;
$parser = new sfYamlParser($c);
$parser->refs =& $this->refs;
$parsed = $parser->parse($value);
$merged = array();
if (!is_array($parsed))
{
throw new InvalidArgumentException(sprintf("YAML merge keys used with a scalar value instead of an array at line %s (%s)", $this->getRealCurrentLineNb() + 1, $this->currentLine));
}
else if (isset($parsed[0]))
{
// Numeric array, merge individual elements
foreach (array_reverse($parsed) as $parsedItem)
{
if (!is_array($parsedItem))
{
throw new InvalidArgumentException(sprintf("Merge items must be arrays at line %s (%s).", $this->getRealCurrentLineNb() + 1, $parsedItem));
}
$merged = array_merge($parsedItem, $merged);
}
}
else
{
// Associative array, merge
$merged = array_merge($merge, $parsed);
}
$isProcessed = $merged;
}
}
else if (isset($values['value']) && preg_match('#^&(?P<ref>[^ ]+) *(?P<value>.*)#', $values['value'], $matches))
{
$isRef = $matches['ref'];
$values['value'] = $matches['value'];
}
if ($isProcessed)
{
// Merge keys
$data = $isProcessed;
}
// hash
else if (!isset($values['value']) || '' == trim($values['value'], ' ') || 0 === strpos(ltrim($values['value'], ' '), '#'))
{
// if next line is less indented or equal, then it means that the current value is null
if ($this->isNextLineIndented())
{
$data[$key] = null;
}
else
{
$c = $this->getRealCurrentLineNb() + 1;
$parser = new sfYamlParser($c);
$parser->refs =& $this->refs;
$data[$key] = $parser->parse($this->getNextEmbedBlock());
}
}
else
{
if ($isInPlace)
{
$data = $this->refs[$isInPlace];
}
else
{
$data[$key] = $this->parseValue($values['value']);
}
}
}
else
{
// one liner?
if (1 == count(explode("\n", rtrim($this->value, "\n"))))
{
$value = sfYamlInline::load($this->lines[0]);
if (is_array($value))
{
$first = reset($value);
if ('*' === substr($first, 0, 1))
{
$data = array();
foreach ($value as $alias)
{
$data[] = $this->refs[substr($alias, 1)];
}
$value = $data;
}
}
return $value;
}
switch (preg_last_error())
{
case PREG_INTERNAL_ERROR:
$error = 'Internal PCRE error on line';
break;
case PREG_BACKTRACK_LIMIT_ERROR:
$error = 'pcre.backtrack_limit reached on line';
break;
case PREG_RECURSION_LIMIT_ERROR:
$error = 'pcre.recursion_limit reached on line';
break;
case PREG_BAD_UTF8_ERROR:
$error = 'Malformed UTF-8 data on line';
break;
case PREG_BAD_UTF8_OFFSET_ERROR:
$error = 'Offset doesn\'t correspond to the begin of a valid UTF-8 code point on line';
break;
default:
$error = 'Unable to parse line';
}
throw new InvalidArgumentException(sprintf('%s %d (%s).', $error, $this->getRealCurrentLineNb() + 1, $this->currentLine));
}
if ($isRef)
{
$this->refs[$isRef] = end($data);
}
}
return empty($data) ? null : $data;
}
/**
* Returns the current line number (takes the offset into account).
*
* @return integer The current line number
*/
protected function getRealCurrentLineNb()
{
return $this->currentLineNb + $this->offset;
}
/**
* Returns the current line indentation.
*
* @return integer The current line indentation
*/
protected function getCurrentLineIndentation()
{
return strlen($this->currentLine) - strlen(ltrim($this->currentLine, ' '));
}
/**
* Returns the next embed block of YAML.
*
* @return string A YAML string
*/
protected function getNextEmbedBlock()
{
$this->moveToNextLine();
$newIndent = $this->getCurrentLineIndentation();
if (!$this->isCurrentLineEmpty() && 0 == $newIndent)
{
throw new InvalidArgumentException(sprintf('Indentation problem at line %d (%s)', $this->getRealCurrentLineNb() + 1, $this->currentLine));
}
$data = array(substr($this->currentLine, $newIndent));
while ($this->moveToNextLine())
{
if ($this->isCurrentLineEmpty())
{
if ($this->isCurrentLineBlank())
{
$data[] = substr($this->currentLine, $newIndent);
}
continue;
}
$indent = $this->getCurrentLineIndentation();
if (preg_match('#^(?P<text> *)$#', $this->currentLine, $match))
{
// empty line
$data[] = $match['text'];
}
else if ($indent >= $newIndent)
{
$data[] = substr($this->currentLine, $newIndent);
}
else if (0 == $indent)
{
$this->moveToPreviousLine();
break;
}
else
{
throw new InvalidArgumentException(sprintf('Indentation problem at line %d (%s)', $this->getRealCurrentLineNb() + 1, $this->currentLine));
}
}
return implode("\n", $data);
}
/**
* Moves the parser to the next line.
*/
protected function moveToNextLine()
{
if ($this->currentLineNb >= count($this->lines) - 1)
{
return false;
}
$this->currentLine = $this->lines[++$this->currentLineNb];
return true;
}
/**
* Moves the parser to the previous line.
*/
protected function moveToPreviousLine()
{
$this->currentLine = $this->lines[--$this->currentLineNb];
}
/**
* Parses a YAML value.
*
* @param string $value A YAML value
*
* @return mixed A PHP value
*/
protected function parseValue($value)
{
if ('*' === substr($value, 0, 1))
{
if (false !== $pos = strpos($value, '#'))
{
$value = substr($value, 1, $pos - 2);
}
else
{
$value = substr($value, 1);
}
if (!array_key_exists($value, $this->refs))
{
throw new InvalidArgumentException(sprintf('Reference "%s" does not exist (%s).', $value, $this->currentLine));
}
return $this->refs[$value];
}
if (preg_match('/^(?P<separator>\||>)(?P<modifiers>\+|\-|\d+|\+\d+|\-\d+|\d+\+|\d+\-)?(?P<comments> +#.*)?$/', $value, $matches))
{
$modifiers = isset($matches['modifiers']) ? $matches['modifiers'] : '';
return $this->parseFoldedScalar($matches['separator'], preg_replace('#\d+#', '', $modifiers), intval(abs($modifiers)));
}
else
{
return sfYamlInline::load($value);
}
}
/**
* Parses a folded scalar.
*
* @param string $separator The separator that was used to begin this folded scalar (| or >)
* @param string $indicator The indicator that was used to begin this folded scalar (+ or -)
* @param integer $indentation The indentation that was used to begin this folded scalar
*
* @return string The text value
*/
protected function parseFoldedScalar($separator, $indicator = '', $indentation = 0)
{
$separator = '|' == $separator ? "\n" : ' ';
$text = '';
$notEOF = $this->moveToNextLine();
while ($notEOF && $this->isCurrentLineBlank())
{
$text .= "\n";
$notEOF = $this->moveToNextLine();
}
if (!$notEOF)
{
return '';
}
if (!preg_match('#^(?P<indent>'.($indentation ? str_repeat(' ', $indentation) : ' +').')(?P<text>.*)$#', $this->currentLine, $matches))
{
$this->moveToPreviousLine();
return '';
}
$textIndent = $matches['indent'];
$previousIndent = 0;
$text .= $matches['text'].$separator;
while ($this->currentLineNb + 1 < count($this->lines))
{
$this->moveToNextLine();
if (preg_match('#^(?P<indent> {'.strlen($textIndent).',})(?P<text>.+)$#', $this->currentLine, $matches))
{
if (' ' == $separator && $previousIndent != $matches['indent'])
{
$text = substr($text, 0, -1)."\n";
}
$previousIndent = $matches['indent'];
$text .= str_repeat(' ', $diff = strlen($matches['indent']) - strlen($textIndent)).$matches['text'].($diff ? "\n" : $separator);
}
else if (preg_match('#^(?P<text> *)$#', $this->currentLine, $matches))
{
$text .= preg_replace('#^ {1,'.strlen($textIndent).'}#', '', $matches['text'])."\n";
}
else
{
$this->moveToPreviousLine();
break;
}
}
if (' ' == $separator)
{
// replace last separator by a newline
$text = preg_replace('/ (\n*)$/', "\n$1", $text);
}
switch ($indicator)
{
case '':
$text = preg_replace('#\n+$#s', "\n", $text);
break;
case '+':
break;
case '-':
$text = preg_replace('#\n+$#s', '', $text);
break;
}
return $text;
}
/**
* Returns true if the next line is indented.
*
* @return Boolean Returns true if the next line is indented, false otherwise
*/
protected function isNextLineIndented()
{
$currentIndentation = $this->getCurrentLineIndentation();
$notEOF = $this->moveToNextLine();
while ($notEOF && $this->isCurrentLineEmpty())
{
$notEOF = $this->moveToNextLine();
}
if (false === $notEOF)
{
return false;
}
$ret = false;
if ($this->getCurrentLineIndentation() <= $currentIndentation)
{
$ret = true;
}
$this->moveToPreviousLine();
return $ret;
}
/**
* Returns true if the current line is blank or if it is a comment line.
*
* @return Boolean Returns true if the current line is empty or if it is a comment line, false otherwise
*/
protected function isCurrentLineEmpty()
{
return $this->isCurrentLineBlank() || $this->isCurrentLineComment();
}
/**
* Returns true if the current line is blank.
*
* @return Boolean Returns true if the current line is blank, false otherwise
*/
protected function isCurrentLineBlank()
{
return '' == trim($this->currentLine, ' ');
}
/**
* Returns true if the current line is a comment line.
*
* @return Boolean Returns true if the current line is a comment line, false otherwise
*/
protected function isCurrentLineComment()
{
//checking explicitly the first char of the trim is faster than loops or strpos
$ltrimmedLine = ltrim($this->currentLine, ' ');
return $ltrimmedLine[0] === '#';
}
/**
* Cleanups a YAML string to be parsed.
*
* @param string $value The input YAML string
*
* @return string A cleaned up YAML string
*/
protected function cleanup($value)
{
$value = str_replace(array("\r\n", "\r"), "\n", $value);
if (!preg_match("#\n$#", $value))
{
$value .= "\n";
}
// strip YAML header
preg_replace('#^\%YAML[: ][\d\.]+.*\n#s', '', $value);
// remove ---
$value = preg_replace('#^\-\-\-.*?\n#s', '', $value);
return $value;
}
}
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