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 16 of file CLDRPluralRuleConverter.php.

Constructor & Destructor Documentation

CLDRPluralRuleConverter::__construct ( $ rule ) [protected]

Private constructor.

Definition at line 101 of file CLDRPluralRuleConverter.php.

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 93 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 112 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:

CLDRPluralRuleConverter_Operator $op

Definition at line 269 of file CLDRPluralRuleConverter.php.

CLDRPluralRuleConverter::error ( $ message ) [protected]

Throw an error.

Definition at line 305 of file CLDRPluralRuleConverter.php.

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

Create a numerical expression object.

Parameters:

string	$text
int	$pos

Returns:: CLDRPluralRuleConverter_Expression The numerical expression

Definition at line 286 of file CLDRPluralRuleConverter.php.

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

Create a binary operator.

Parameters:

string	$type
int	$pos
int	$length

Returns:: CLDRPluralRuleConverter_Operator The operator

Definition at line 298 of file CLDRPluralRuleConverter.php.

CLDRPluralRuleConverter::nextToken ( ) [protected]

Fetch the next token from the input string.

Returns:: CLDRPluralRuleConverter_Fragment The next token

Definition at line 172 of file CLDRPluralRuleConverter.php.

Member Data Documentation

int CLDRPluralRuleConverter::$end

The past-the-end position.

Definition at line 33 of file CLDRPluralRuleConverter.php.

array CLDRPluralRuleConverter::$operands = array()

The operand stack.

Definition at line 45 of file CLDRPluralRuleConverter.php.

array CLDRPluralRuleConverter::$operators = array()

The operator stack.

Definition at line 39 of file CLDRPluralRuleConverter.php.

int CLDRPluralRuleConverter::$pos

The current position.

Definition at line 27 of file CLDRPluralRuleConverter.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,
    )