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.
Static Public Attributes
static	$precedence
	Precedence levels.
Protected Member Functions
	__construct ($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.

Detailed Description

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

Definition at line 264 of file CLDRPluralRuleEvaluator.php.

Constructor & Destructor Documentation

CLDRPluralRuleConverter::__construct ( $ rule ) [protected]

Private constructor.

Definition at line 346 of file CLDRPluralRuleEvaluator.php.

Member Function Documentation

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

Convert a rule to RPN.

This is the only public entry point.

Definition at line 338 of file CLDRPluralRuleEvaluator.php.

References $parser, and $rule.

Referenced by CLDRPluralRuleEvaluator\compile().

CLDRPluralRuleConverter::doConvert ( ) [protected]

Do the operation.

Definition at line 355 of file CLDRPluralRuleEvaluator.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.

Definition at line 508 of file CLDRPluralRuleEvaluator.php.

CLDRPluralRuleConverter::error ( $ message ) [protected]

Throw an error.

Definition at line 535 of file CLDRPluralRuleEvaluator.php.

Referenced by nextToken().

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

Create a numerical expression object.

Definition at line 521 of file CLDRPluralRuleEvaluator.php.

Referenced by nextToken().

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

Create a binary operator.

Definition at line 528 of file CLDRPluralRuleEvaluator.php.

Referenced by nextToken().

CLDRPluralRuleConverter::nextToken ( ) [protected]

Fetch the next token from the input string.

Return it as a CLDRPluralRuleConverter_Fragment object.

Definition at line 413 of file CLDRPluralRuleEvaluator.php.

References error(), newNumber(), newOperator(), and rule().

Member Data Documentation

int CLDRPluralRuleConverter::$end

The past-the-end position.

Definition at line 281 of file CLDRPluralRuleEvaluator.php.

array CLDRPluralRuleConverter::$operands = array()

The operand stack.

Definition at line 293 of file CLDRPluralRuleEvaluator.php.

array CLDRPluralRuleConverter::$operators = array()

The operator stack.

Definition at line 287 of file CLDRPluralRuleEvaluator.php.

int CLDRPluralRuleConverter::$pos

The current position.

Definition at line 275 of file CLDRPluralRuleEvaluator.php.

CLDRPluralRuleConverter::$precedence [static]

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,
    )