102 lines
3.9 KiB
PHP
102 lines
3.9 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Yaml;
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/**
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* Escaper encapsulates escaping rules for single and double-quoted
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* YAML strings.
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*
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* @author Matthew Lewinski <matthew@lewinski.org>
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*
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* @internal
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*/
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class Escaper
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{
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// Characters that would cause a dumped string to require double quoting.
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const REGEX_CHARACTER_TO_ESCAPE = "[\\x00-\\x1f]|\xc2\x85|\xc2\xa0|\xe2\x80\xa8|\xe2\x80\xa9";
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// Mapping arrays for escaping a double quoted string. The backslash is
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// first to ensure proper escaping because str_replace operates iteratively
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// on the input arrays. This ordering of the characters avoids the use of strtr,
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// which performs more slowly.
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private static $escapees = array('\\', '\\\\', '\\"', '"',
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"\x00", "\x01", "\x02", "\x03", "\x04", "\x05", "\x06", "\x07",
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"\x08", "\x09", "\x0a", "\x0b", "\x0c", "\x0d", "\x0e", "\x0f",
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"\x10", "\x11", "\x12", "\x13", "\x14", "\x15", "\x16", "\x17",
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"\x18", "\x19", "\x1a", "\x1b", "\x1c", "\x1d", "\x1e", "\x1f",
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"\xc2\x85", "\xc2\xa0", "\xe2\x80\xa8", "\xe2\x80\xa9",
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);
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private static $escaped = array('\\\\', '\\"', '\\\\', '\\"',
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'\\0', '\\x01', '\\x02', '\\x03', '\\x04', '\\x05', '\\x06', '\\a',
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'\\b', '\\t', '\\n', '\\v', '\\f', '\\r', '\\x0e', '\\x0f',
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'\\x10', '\\x11', '\\x12', '\\x13', '\\x14', '\\x15', '\\x16', '\\x17',
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'\\x18', '\\x19', '\\x1a', '\\e', '\\x1c', '\\x1d', '\\x1e', '\\x1f',
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'\\N', '\\_', '\\L', '\\P',
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);
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/**
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* Determines if a PHP value would require double quoting in YAML.
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*
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* @param string $value A PHP value
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*
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* @return bool True if the value would require double quotes
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*/
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public static function requiresDoubleQuoting($value)
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{
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return 0 < preg_match('/'.self::REGEX_CHARACTER_TO_ESCAPE.'/u', $value);
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}
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/**
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* Escapes and surrounds a PHP value with double quotes.
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*
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* @param string $value A PHP value
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*
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* @return string The quoted, escaped string
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*/
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public static function escapeWithDoubleQuotes($value)
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{
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return sprintf('"%s"', str_replace(self::$escapees, self::$escaped, $value));
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}
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/**
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* Determines if a PHP value would require single quoting in YAML.
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*
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* @param string $value A PHP value
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*
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* @return bool True if the value would require single quotes
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*/
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public static function requiresSingleQuoting($value)
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{
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// Determines if a PHP value is entirely composed of a value that would
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// require single quoting in YAML.
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if (in_array(strtolower($value), array('null', '~', 'true', 'false', 'y', 'n', 'yes', 'no', 'on', 'off'))) {
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return true;
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}
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// Determines if the PHP value contains any single characters that would
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// cause it to require single quoting in YAML.
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return 0 < preg_match('/[ \s \' " \: \{ \} \[ \] , & \* \# \?] | \A[ \- ? | < > = ! % @ ` ]/x', $value);
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}
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/**
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* Escapes and surrounds a PHP value with single quotes.
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*
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* @param string $value A PHP value
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*
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* @return string The quoted, escaped string
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*/
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public static function escapeWithSingleQuotes($value)
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{
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return sprintf("'%s'", str_replace('\'', '\'\'', $value));
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}
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}
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