Helper class for converting rules to reverse polish notation (RPN). More...

Collaboration diagram for CLDRPluralRuleConverter:

Static Public Member Functions
static	convert ($rule)
	Convert a rule to RPN.
Public Attributes
int	$end
	The past-the-end position.
array	$operands = array()
	The operand stack.
array	$operators = array()
	The operator stack.
int	$pos
	The current position.
string	$rule
	The input string.
const	NUMBER_CLASS = '0123456789'
	Same for digits.
const	OPERAND_SYMBOLS = 'nivwft'
	A character list of symbolic operands.
const	WHITESPACE_CLASS = " \t\r\n"
	A character list defining whitespace, for use in strspn() etc.
const	WORD_REGEX = '/[a-zA-Z@]+/A'
	An anchored regular expression which matches a word at the current offset.
Protected Member Functions
	__construct ($rule)
	Private constructor.
	doConvert ()
	Do the operation.
	doOperation ($op)
	For the binary operator $op, pop its operands off the stack and push a fragment with rpn and type members describing the result of that operation.
	error ($message)
	Throw an error.
	newNumber ($text, $pos)
	Create a numerical expression object.
	newOperator ($type, $pos, $length)
	Create a binary operator.
	nextToken ()
	Fetch the next token from the input string.
Static Private Attributes
static	$precedence
	Precedence levels.

Detailed Description

Helper class for converting rules to reverse polish notation (RPN).

Definition at line 15 of file CLDRPluralRuleConverter.php.

Constructor & Destructor Documentation

CLDRPluralRuleConverter::__construct ( $ rule ) [protected]

Private constructor.

Parameters:

string $rule

Definition at line 102 of file CLDRPluralRuleConverter.php.

References $rule.

Member Function Documentation

static CLDRPluralRuleConverter::convert ( $ rule ) [static]

Convert a rule to RPN.

This is the only public entry point.

Parameters:

string $rule The rule to convert

Returns:: string The RPN representation of the rule

Definition at line 92 of file CLDRPluralRuleConverter.php.

Referenced by CLDRPluralRuleEvaluator\compile().

CLDRPluralRuleConverter::doConvert ( ) [protected]

Do the operation.

Returns:: string The RPN representation of the rule (e.g. "5 3 mod n is")

Definition at line 113 of file CLDRPluralRuleConverter.php.

CLDRPluralRuleConverter::doOperation ( $ op ) [protected]

For the binary operator $op, pop its operands off the stack and push a fragment with rpn and type members describing the result of that operation.

Parameters:

CLDRPluralRuleConverterOperator $op

Definition at line 277 of file CLDRPluralRuleConverter.php.

CLDRPluralRuleConverter::error ( $ message ) [protected]

Throw an error.

Parameters:

string $message

Definition at line 314 of file CLDRPluralRuleConverter.php.

CLDRPluralRuleConverter::newNumber	(	$	text,
		$	pos
	)		`[protected]`

Create a numerical expression object.

Parameters:

string	$text
int	$pos

Returns:: CLDRPluralRuleConverterExpression The numerical expression

Definition at line 294 of file CLDRPluralRuleConverter.php.

CLDRPluralRuleConverter::newOperator	(	$	type,
		$	pos,
		$	length
	)		`[protected]`

Create a binary operator.

Parameters:

string	$type
int	$pos
int	$length

Returns:: CLDRPluralRuleConverterOperator The operator

Definition at line 306 of file CLDRPluralRuleConverter.php.

CLDRPluralRuleConverter::nextToken ( ) [protected]

Fetch the next token from the input string.

Returns:: CLDRPluralRuleConverterFragment The next token

Definition at line 173 of file CLDRPluralRuleConverter.php.

Member Data Documentation

int CLDRPluralRuleConverter::$end

The past-the-end position.

Definition at line 32 of file CLDRPluralRuleConverter.php.

array CLDRPluralRuleConverter::$operands = array()

The operand stack.

Definition at line 44 of file CLDRPluralRuleConverter.php.

array CLDRPluralRuleConverter::$operators = array()

The operator stack.

Definition at line 38 of file CLDRPluralRuleConverter.php.

int CLDRPluralRuleConverter::$pos

The current position.

Definition at line 26 of file CLDRPluralRuleConverter.php.

CLDRPluralRuleConverter::$precedence [static, private]

Initial value:

 array(
        'or' => 2,
        'and' => 3,
        'is' => 4,
        'is-not' => 4,
        'in' => 4,
        'not-in' => 4,
        'within' => 4,
        'not-within' => 4,
        'mod' => 5,
        ',' => 6,
        '..' => 7,
    )