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File Content: `Parser.php`

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Yaml;

use Symfony\Component\Yaml\Exception\ParseException;

/**
 * Parser parses YAML strings to convert them to PHP arrays.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class Parser
{
    const FOLDED_SCALAR_PATTERN = '(?P<separator>\||>)(?P<modifiers>\+|\-|\d+|\+\d+|\-\d+|\d+\+|\d+\-)?(?P<comments> +#.*)?';

    private $offset         = 0;
    private $lines          = array();
    private $currentLineNb  = -1;
    private $currentLine    = '';
    private $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
     * @param Boolean $exceptionOnInvalidType true if an exception must be thrown on invalid types (a PHP resource or object), false otherwise
     * @param Boolean $objectSupport          true if object support is enabled, false otherwise
     *
     * @return mixed  A PHP value
     *
     * @throws ParseException If the YAML is not valid
     */
    public function parse($value, $exceptionOnInvalidType = false, $objectSupport = false)
    {
        $this->currentLineNb = -1;
        $this->currentLine = '';
        $this->lines = explode("\n", $this->cleanup($value));

        if (function_exists('mb_detect_encoding') && false === mb_detect_encoding($value, 'UTF-8', true)) {
            throw new ParseException('The YAML value does not appear to be valid UTF-8.');
        }

        if (function_exists('mb_internal_encoding') && ((int) ini_get('mbstring.func_overload')) & 2) {
            $mbEncoding = mb_internal_encoding();
            mb_internal_encoding('UTF-8');
        }

        $data = array();
        $context = null;
        while ($this->moveToNextLine()) {
            if ($this->isCurrentLineEmpty()) {
                continue;
            }

            // tab?
            if ("\t" === $this->currentLine[0]) {
                throw new ParseException('A YAML file cannot contain tabs as indentation.', $this->getRealCurrentLineNb() + 1, $this->currentLine);
            }

            $isRef = $isInPlace = $isProcessed = false;
            if (preg_match('#^\-((?P<leadspaces>\s+)(?P<value>.+?))?\s*$#u', $this->currentLine, $values)) {
                if ($context && 'mapping' == $context) {
                    throw new ParseException('You cannot define a sequence item when in a mapping');
                }
                $context = 'sequence';

                if (isset($values['value']) && preg_match('#^&(?P<ref>[^ ]+) *(?P<value>.*)#u', $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;
                    $parser = new Parser($c);
                    $parser->refs =& $this->refs;
                    $data[] = $parser->parse($this->getNextEmbedBlock(), $exceptionOnInvalidType, $objectSupport);
                } else {
                    if (isset($values['leadspaces'])
                        && ' ' == $values['leadspaces']
                        && preg_match('#^(?P<key>'.Inline::REGEX_QUOTED_STRING.'|[^ \'"\{\[].*?) *\:(\s+(?P<value>.+?))?\s*$#u', $values['value'], $matches)
                    ) {
                        // this is a compact notation element, add to next block and parse
                        $c = $this->getRealCurrentLineNb();
                        $parser = new Parser($c);
                        $parser->refs =& $this->refs;

                        $block = $values['value'];
                        if ($this->isNextLineIndented()) {
                            $block .= "\n".$this->getNextEmbedBlock($this->getCurrentLineIndentation() + 2);
                        }

                        $data[] = $parser->parse($block, $exceptionOnInvalidType, $objectSupport);
                    } else {
                        $data[] = $this->parseValue($values['value'], $exceptionOnInvalidType, $objectSupport);
                    }
                }
            } elseif (preg_match('#^(?P<key>'.Inline::REGEX_QUOTED_STRING.'|[^ \'"\[\{].*?) *\:(\s+(?P<value>.+?))?\s*$#u', $this->currentLine, $values) && false === strpos($values['key'],' #')) {
                if ($context && 'sequence' == $context) {
                    throw new ParseException('You cannot define a mapping item when in a sequence');
                }
                $context = 'mapping';

                // force correct settings
                Inline::parse(null, $exceptionOnInvalidType, $objectSupport);
                try {
                    $key = Inline::parseScalar($values['key']);
                } catch (ParseException $e) {
                    $e->setParsedLine($this->getRealCurrentLineNb() + 1);
                    $e->setSnippet($this->currentLine);

                    throw $e;
                }

                if ('<<' === $key) {
                    if (isset($values['value']) && 0 === strpos($values['value'], '*')) {
                        $isInPlace = substr($values['value'], 1);
                        if (!array_key_exists($isInPlace, $this->refs)) {
                            throw new ParseException(sprintf('Reference "%s" does not exist.', $isInPlace), $this->getRealCurrentLineNb() + 1, $this->currentLine);
                        }
                    } else {
                        if (isset($values['value']) && $values['value'] !== '') {
                            $value = $values['value'];
                        } else {
                            $value = $this->getNextEmbedBlock();
                        }
                        $c = $this->getRealCurrentLineNb() + 1;
                        $parser = new Parser($c);
                        $parser->refs =& $this->refs;
                        $parsed = $parser->parse($value, $exceptionOnInvalidType, $objectSupport);

                        $merged = array();
                        if (!is_array($parsed)) {
                            throw new ParseException('YAML merge keys used with a scalar value instead of an array.', $this->getRealCurrentLineNb() + 1, $this->currentLine);
                        } elseif (isset($parsed[0])) {
                            // Numeric array, merge individual elements
                            foreach (array_reverse($parsed) as $parsedItem) {
                                if (!is_array($parsedItem)) {
                                    throw new ParseException('Merge items must be arrays.', $this->getRealCurrentLineNb() + 1, $parsedItem);
                                }
                                $merged = array_merge($parsedItem, $merged);
                            }
                        } else {
                            // Associative array, merge
                            $merged = array_merge($merged, $parsed);
                        }

                        $isProcessed = $merged;
                    }
                } elseif (isset($values['value']) && preg_match('#^&(?P<ref>[^ ]+) *(?P<value>.*)#u', $values['value'], $matches)) {
                    $isRef = $matches['ref'];
                    $values['value'] = $matches['value'];
                }

                if ($isProcessed) {
                    // Merge keys
                    $data = $isProcessed;
                // hash
                } elseif (!isset($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 (!$this->isNextLineIndented() && !$this->isNextLineUnIndentedCollection()) {
                        $data[$key] = null;
                    } else {
                        $c = $this->getRealCurrentLineNb() + 1;
                        $parser = new Parser($c);
                        $parser->refs =& $this->refs;
                        $data[$key] = $parser->parse($this->getNextEmbedBlock(), $exceptionOnInvalidType, $objectSupport);
                    }
                } else {
                    if ($isInPlace) {
                        $data = $this->refs[$isInPlace];
                    } else {
                        $data[$key] = $this->parseValue($values['value'], $exceptionOnInvalidType, $objectSupport);
                    }
                }
            } else {
                // 1-liner optionally followed by newline
                $lineCount = count($this->lines);
                if (1 === $lineCount || (2 === $lineCount && empty($this->lines[1]))) {
                    try {
                        $value = Inline::parse($this->lines[0], $exceptionOnInvalidType, $objectSupport);
                    } catch (ParseException $e) {
                        $e->setParsedLine($this->getRealCurrentLineNb() + 1);
                        $e->setSnippet($this->currentLine);

                        throw $e;
                    }

                    if (is_array($value)) {
                        $first = reset($value);
                        if (is_string($first) && 0 === strpos($first, '*')) {
                            $data = array();
                            foreach ($value as $alias) {
                                $data[] = $this->refs[substr($alias, 1)];
                            }
                            $value = $data;
                        }
                    }

                    if (isset($mbEncoding)) {
                        mb_internal_encoding($mbEncoding);
                    }

                    return $value;
                }

                switch (preg_last_error()) {
                    case PREG_INTERNAL_ERROR:
                        $error = 'Internal PCRE error.';
                        break;
                    case PREG_BACKTRACK_LIMIT_ERROR:
                        $error = 'pcre.backtrack_limit reached.';
                        break;
                    case PREG_RECURSION_LIMIT_ERROR:
                        $error = 'pcre.recursion_limit reached.';
                        break;
                    case PREG_BAD_UTF8_ERROR:
                        $error = 'Malformed UTF-8 data.';
                        break;
                    case PREG_BAD_UTF8_OFFSET_ERROR:
                        $error = 'Offset doesn\'t correspond to the begin of a valid UTF-8 code point.';
                        break;
                    default:
                        $error = 'Unable to parse.';
                }

                throw new ParseException($error, $this->getRealCurrentLineNb() + 1, $this->currentLine);
            }

            if ($isRef) {
                $this->refs[$isRef] = end($data);
            }
        }

        if (isset($mbEncoding)) {
            mb_internal_encoding($mbEncoding);
        }

        return empty($data) ? null : $data;
    }

    /**
     * Returns the current line number (takes the offset into account).
     *
     * @return integer The current line number
     */
    private function getRealCurrentLineNb()
    {
        return $this->currentLineNb + $this->offset;
    }

    /**
     * Returns the current line indentation.
     *
     * @return integer The current line indentation
     */
    private function getCurrentLineIndentation()
    {
        return strlen($this->currentLine) - strlen(ltrim($this->currentLine, ' '));
    }

    /**
     * Returns the next embed block of YAML.
     *
     * @param integer $indentation The indent level at which the block is to be read, or null for default
     *
     * @return string A YAML string
     *
     * @throws ParseException When indentation problem are detected
     */
    private function getNextEmbedBlock($indentation = null)
    {
        $this->moveToNextLine();

        if (null === $indentation) {
            $newIndent = $this->getCurrentLineIndentation();

            $unindentedEmbedBlock = $this->isStringUnIndentedCollectionItem($this->currentLine);

            if (!$this->isCurrentLineEmpty() && 0 === $newIndent && !$unindentedEmbedBlock) {
                throw new ParseException('Indentation problem.', $this->getRealCurrentLineNb() + 1, $this->currentLine);
            }
        } else {
            $newIndent = $indentation;
        }

        $data = array(substr($this->currentLine, $newIndent));

        $isItUnindentedCollection = $this->isStringUnIndentedCollectionItem($this->currentLine);

        // Comments must not be removed inside a string block (ie. after a line ending with "|")
        $removeCommentsPattern = '~'.self::FOLDED_SCALAR_PATTERN.'$~';
        $removeComments = !preg_match($removeCommentsPattern, $this->currentLine);

        while ($this->moveToNextLine()) {
            $indent = $this->getCurrentLineIndentation();

            if ($indent === $newIndent) {
                $removeComments = !preg_match($removeCommentsPattern, $this->currentLine);
            }

            if ($isItUnindentedCollection && !$this->isStringUnIndentedCollectionItem($this->currentLine)) {
                $this->moveToPreviousLine();
                break;
            }

            if ($this->isCurrentLineBlank()) {
                $data[] = substr($this->currentLine, $newIndent);
                continue;
            }

            if ($removeComments && $this->isCurrentLineComment()) {
                continue;
            }

            if ($indent >= $newIndent) {
                $data[] = substr($this->currentLine, $newIndent);
            } elseif (0 == $indent) {
                $this->moveToPreviousLine();

                break;
            } else {
                throw new ParseException('Indentation problem.', $this->getRealCurrentLineNb() + 1, $this->currentLine);
            }
        }

        return implode("\n", $data);
    }

    /**
     * Moves the parser to the next line.
     *
     * @return Boolean
     */
    private 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.
     */
    private function moveToPreviousLine()
    {
        $this->currentLine = $this->lines[--$this->currentLineNb];
    }

    /**
     * Parses a YAML value.
     *
     * @param string  $value                  A YAML value
     * @param Boolean $exceptionOnInvalidType True if an exception must be thrown on invalid types false otherwise
     * @param Boolean $objectSupport          True if object support is enabled, false otherwise
     *
     * @return mixed  A PHP value
     *
     * @throws ParseException When reference does not exist
     */
    private function parseValue($value, $exceptionOnInvalidType, $objectSupport)
    {
        if (0 === strpos($value, '*')) {
            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 ParseException(sprintf('Reference "%s" does not exist.', $value), $this->currentLine);
            }

            return $this->refs[$value];
        }

        if (preg_match('/^'.self::FOLDED_SCALAR_PATTERN.'$/', $value, $matches)) {
            $modifiers = isset($matches['modifiers']) ? $matches['modifiers'] : '';

            return $this->parseFoldedScalar($matches['separator'], preg_replace('#\d+#', '', $modifiers), intval(abs($modifiers)));
        }

        try {
            return Inline::parse($value, $exceptionOnInvalidType, $objectSupport);
        } catch (ParseException $e) {
            $e->setParsedLine($this->getRealCurrentLineNb() + 1);
            $e->setSnippet($this->currentLine);

            throw $e;
        }
    }

    /**
     * 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 $indentation The indentation that was used to begin this folded scalar
     *
     * @return string  The text value
     */
    private function parseFoldedScalar($separator, $indicator = '', $indentation = 0)
    {
        $notEOF = $this->moveToNextLine();
        if (!$notEOF) {
            return '';
        }

        $isCurrentLineBlank = $this->isCurrentLineBlank();
        $text = '';

        // leading blank lines are consumed before determining indentation
        while ($notEOF && $isCurrentLineBlank) {
            // newline only if not EOF
            if ($notEOF = $this->moveToNextLine()) {
                $text .= "\n";
                $isCurrentLineBlank = $this->isCurrentLineBlank();
            }
        }

        // determine indentation if not specified
        if (0 === $indentation) {
            if (preg_match('/^ +/', $this->currentLine, $matches)) {
                $indentation = strlen($matches[0]);
            }
        }

        if ($indentation > 0) {
            $pattern = sprintf('/^ {%d}(.*)$/', $indentation);

            while (
                $notEOF && (
                    $isCurrentLineBlank ||
                    preg_match($pattern, $this->currentLine, $matches)
                )
            ) {
                if ($isCurrentLineBlank) {
                    $text .= substr($this->currentLine, $indentation);
                } else {
                    $text .= $matches[1];
                }

                // newline only if not EOF
                if ($notEOF = $this->moveToNextLine()) {
                    $text .= "\n";
                    $isCurrentLineBlank = $this->isCurrentLineBlank();
                }
            }
        } elseif ($notEOF) {
            $text .= "\n";
        }

        if ($notEOF) {
            $this->moveToPreviousLine();
        }

        // replace all non-trailing single newlines with spaces in folded blocks
        if ('>' === $separator) {
            preg_match('/(\n*)$/', $text, $matches);
            $text = preg_replace('/(?<!\n)\n(?!\n)/', ' ', rtrim($text, "\n"));
            $text .= $matches[1];
        }

        // deal with trailing newlines as indicated
        if ('' === $indicator) {
            $text = preg_replace('/\n+$/s', "\n", $text);
        } elseif ('-' === $indicator) {
            $text = preg_replace('/\n+$/s', '', $text);
        }

        return $text;
    }

    /**
     * Returns true if the next line is indented.
     *
     * @return Boolean Returns true if the next line is indented, false otherwise
     */
    private function isNextLineIndented()
    {
        $currentIndentation = $this->getCurrentLineIndentation();
        $EOF = !$this->moveToNextLine();

        while (!$EOF && $this->isCurrentLineEmpty()) {
            $EOF = !$this->moveToNextLine();
        }

        if ($EOF) {
            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
     */
    private 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
     */
    private 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
     */
    private 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 $value The input YAML string
     *
     * @return string A cleaned up YAML string
     */
    private function cleanup($value)
    {
        $value = str_replace(array("\r\n", "\r"), "\n", $value);

        // strip YAML header
        $count = 0;
        $value = preg_replace('#^\%YAML[: ][\d\.]+.*\n#su', '', $value, -1, $count);
        $this->offset += $count;

        // remove leading comments
        $trimmedValue = preg_replace('#^(\#.*?\n)+#s', '', $value, -1, $count);
        if ($count == 1) {
            // items have been removed, update the offset
            $this->offset += substr_count($value, "\n") - substr_count($trimmedValue, "\n");
            $value = $trimmedValue;
        }

        // remove start of the document marker (---)
        $trimmedValue = preg_replace('#^\-\-\-.*?\n#s', '', $value, -1, $count);
        if ($count == 1) {
            // items have been removed, update the offset
            $this->offset += substr_count($value, "\n") - substr_count($trimmedValue, "\n");
            $value = $trimmedValue;

            // remove end of the document marker (...)
            $value = preg_replace('#\.\.\.\s*$#s', '', $value);
        }

        return $value;
    }

    /**
     * Returns true if the next line starts unindented collection
     *
     * @return Boolean Returns true if the next line starts unindented collection, false otherwise
     */
    private function isNextLineUnIndentedCollection()
    {
        $currentIndentation = $this->getCurrentLineIndentation();
        $notEOF = $this->moveToNextLine();

        while ($notEOF && $this->isCurrentLineEmpty()) {
            $notEOF = $this->moveToNextLine();
        }

        if (false === $notEOF) {
            return false;
        }

        $ret = false;
        if (
            $this->getCurrentLineIndentation() == $currentIndentation
            &&
            $this->isStringUnIndentedCollectionItem($this->currentLine)
        ) {
            $ret = true;
        }

        $this->moveToPreviousLine();

        return $ret;
    }

    /**
     * Returns true if the string is un-indented collection item
     *
     * @return Boolean Returns true if the string is un-indented collection item, false otherwise
     */
    private function isStringUnIndentedCollectionItem()
    {
        return (0 === strpos($this->currentLine, '- '));
    }

}
Name	Size	Permission
Exception	---	0755
Dumper.php	2452 bytes	0644
Escaper.php	3437 bytes	0644
Inline.php	16291 bytes	0644
Parser.php	23446 bytes	0644
Unescaper.php	4511 bytes	0644
Yaml.php	3342 bytes	0644
autoloader.php	334 bytes	0644
File Content: Parser.php

File Content: `Parser.php`
