Symfony\Component\Yaml\Unescaper Class Reference

Unescaper encapsulates unescaping rules for single and double-quoted YAML strings. More...

Collaboration diagram for Symfony\Component\Yaml\Unescaper:

Public Member Functions
	unescapeSingleQuotedString ($value)
	Unescapes a single quoted string. More...
	unescapeDoubleQuotedString ($value)
	Unescapes a double quoted string. More...

Data Fields
const	REGEX_ESCAPED_CHARACTER = '\\\\(x[0-9a-fA-F]{2}|u[0-9a-fA-F]{4}|U[0-9a-fA-F]{8}|.)'
	Regex fragment that matches an escaped character in a double quoted string. More...

Private Member Functions
	unescapeCharacter ($value)
	Unescapes a character that was found in a double-quoted string. More...

Static Private Member Functions
static	utf8chr ($c)
	Get the UTF-8 character for the given code point. More...

Detailed Description

Unescaper encapsulates unescaping rules for single and double-quoted YAML strings.

Author

Matthew Lewinski matth.nosp@m.ew@l.nosp@m.ewins.nosp@m.ki.o.nosp@m.rg

Definition at line 24 of file Unescaper.php.

Member Function Documentation

unescapeCharacter()

Symfony\Component\Yaml\Unescaper::unescapeCharacter (   $value )

private

Unescapes a character that was found in a double-quoted string.

Parameters

string

$value

An escaped character

Returns

string The unescaped character

Definition at line 67 of file Unescaper.php.

Referenced by Symfony\Component\Yaml\Unescaper\unescapeDoubleQuotedString().

    {
        switch ($value[1]) {
            case '0':
                return "\x0";
            case 'a':
                return "\x7";
            case 'b':
                return "\x8";
            case 't':
                return "\t";
            case "\t":
                return "\t";
            case 'n':
                return "\n";
            case 'v':
                return "\xB";
            case 'f':
                return "\xC";
            case 'r':
                return "\r";
            case 'e':
                return "\x1B";
            case ' ':
                return ' ';
            case '"':
                return '"';
            case '/':
                return '/';
            case '\\':
                return '\\';
            case 'N':
                // U+0085 NEXT LINE
                return "\xC2\x85";
            case '_':
                // U+00A0 NO-BREAK SPACE
                return "\xC2\xA0";
            case 'L':
                // U+2028 LINE SEPARATOR
                return "\xE2\x80\xA8";
            case 'P':
                // U+2029 PARAGRAPH SEPARATOR
                return "\xE2\x80\xA9";
            case 'x':
                return self::utf8chr(hexdec(substr($value, 2, 2)));
            case 'u':
                return self::utf8chr(hexdec(substr($value, 2, 4)));
            case 'U':
                return self::utf8chr(hexdec(substr($value, 2, 8)));
            default:
                throw new ParseException(sprintf('Found unknown escape character "%s".', $value));
        }
    }

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unescapeDoubleQuotedString()

Symfony\Component\Yaml\Unescaper::unescapeDoubleQuotedString

(

$value

)

Unescapes a double quoted string.

Parameters

string

$value

A double quoted string

Returns

string The unescaped string

Definition at line 50 of file Unescaper.php.

References Symfony\Component\Yaml\Unescaper\unescapeCharacter().

    {
        $callback = function ($match) {
            return $this->unescapeCharacter($match[0]);
        };

        // evaluate the string
        return preg_replace_callback('/'.self::REGEX_ESCAPED_CHARACTER.'/u', $callback, $value);
    }

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unescapeSingleQuotedString()

Symfony\Component\Yaml\Unescaper::unescapeSingleQuotedString

(

$value

)

Unescapes a single quoted string.

Parameters

string

$value

A single quoted string

Returns

string The unescaped string

Definition at line 38 of file Unescaper.php.

    {
        return str_replace('\'\'', '\'', $value);
    }

utf8chr()

static Symfony\Component\Yaml\Unescaper::utf8chr (   $c )

staticprivate

Get the UTF-8 character for the given code point.

Parameters

int

$c

The unicode code point

Returns

string The corresponding UTF-8 character

Definition at line 128 of file Unescaper.php.

    {
        if (0x80 > $c %= 0x200000) {
            return chr($c);
        }
        if (0x800 > $c) {
            return chr(0xC0 | $c >> 6).chr(0x80 | $c & 0x3F);
        }
        if (0x10000 > $c) {
            return chr(0xE0 | $c >> 12).chr(0x80 | $c >> 6 & 0x3F).chr(0x80 | $c & 0x3F);
        }

        return chr(0xF0 | $c >> 18).chr(0x80 | $c >> 12 & 0x3F).chr(0x80 | $c >> 6 & 0x3F).chr(0x80 | $c & 0x3F);
    }

Field Documentation

REGEX_ESCAPED_CHARACTER

const Symfony\Component\Yaml\Unescaper::REGEX_ESCAPED_CHARACTER = '\\\\(x[0-9a-fA-F]{2}|u[0-9a-fA-F]{4}|U[0-9a-fA-F]{8}|.)'

Regex fragment that matches an escaped character in a double quoted string.

Definition at line 29 of file Unescaper.php.

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The documentation for this class was generated from the following file:

• libs/composer/vendor/symfony/yaml/Unescaper.php