Public Member Functions
	doExpression ( $expr)
	Evaluate a mathematical expression. More...

	doOperation ( $op, &$stack)

Public Attributes
	$maxStackSize = 100

	$names

	$precedence

	$words

Detailed Description

Definition at line 69 of file Expr.php.

Member Function Documentation

◆ doExpression()

ExprParser::doExpression ( $expr )

Evaluate a mathematical expression.

The algorithm here is based on the infix to RPN algorithm given in http://montcs.bloomu.edu/~bobmon/Information/RPN/infix2rpn.shtml It's essentially the same as Dijkstra's shunting yard algorithm.

Parameters

$expr string

Exceptions

ExprError

Returns: string

Definition at line 183 of file Expr.php.

References $matches, $name, array(), captcha-old\count, doOperation(), EXPR_ABS, EXPR_ARCCOS, EXPR_ARCSINE, EXPR_ARCTAN, EXPR_CEIL, EXPR_COSINE, EXPR_DIVIDE, EXPR_EQUALITY, EXPR_EXP, EXPR_EXPONENT, EXPR_FLOOR, EXPR_GREATER, EXPR_GREATEREQ, EXPR_LESS, EXPR_LESSEQ, EXPR_LN, EXPR_MINUS, EXPR_NEGATIVE, EXPR_NOT, EXPR_NOTEQ, EXPR_NUMBER_CLASS, EXPR_OPEN, EXPR_PI, EXPR_PLUS, EXPR_POSITIVE, EXPR_POW, EXPR_SINE, EXPR_SQRT, EXPR_TANGENS, EXPR_TIMES, EXPR_TRUNC, EXPR_WHITE_CLASS, and captcha-old\words.

◆ doOperation()

ExprParser::doOperation	(		$op,
		&	$stack
	)

Parameters

$op	int
$stack	array

Exceptions

ExprError

Definition at line 403 of file Expr.php.

References $value, captcha-old\count, EXPR_ABS, EXPR_AND, EXPR_ARCCOS, EXPR_ARCSINE, EXPR_ARCTAN, EXPR_CEIL, EXPR_COSINE, EXPR_DIVIDE, EXPR_EQUALITY, EXPR_EXP, EXPR_EXPONENT, EXPR_FLOOR, EXPR_FMOD, EXPR_GREATER, EXPR_GREATEREQ, EXPR_LESS, EXPR_LESSEQ, EXPR_LN, EXPR_MINUS, EXPR_MOD, EXPR_NEGATIVE, EXPR_NOT, EXPR_NOTEQ, EXPR_OR, EXPR_PLUS, EXPR_POSITIVE, EXPR_POW, EXPR_ROUND, EXPR_SINE, EXPR_SQRT, EXPR_TANGENS, EXPR_TIMES, EXPR_TRUNC, and names.

Referenced by doExpression().

Member Data Documentation

◆ $maxStackSize

ExprParser::$maxStackSize = 100

Definition at line 70 of file Expr.php.

◆ $names

ExprParser::$names

Definition at line 111 of file Expr.php.

◆ $precedence

ExprParser::$precedence

Definition at line 72 of file Expr.php.

◆ $words

ExprParser::$words

Initial value:

= array(
        'mod' => EXPR_MOD,
        'fmod' => EXPR_FMOD,
        'and' => EXPR_AND,
        'or' => EXPR_OR,
        'not' => EXPR_NOT,
        'round' => EXPR_ROUND,
        'div' => EXPR_DIVIDE,
        'e' => EXPR_EXPONENT,
        'sin' => EXPR_SINE,
        'cos' => EXPR_COSINE,
        'tan' => EXPR_TANGENS,
        'asin' => EXPR_ARCSINE,
        'acos' => EXPR_ARCCOS,
        'atan' => EXPR_ARCTAN,
        'exp' => EXPR_EXP,
        'ln' => EXPR_LN,
        'abs' => EXPR_ABS,
        'trunc' => EXPR_TRUNC,
        'floor' => EXPR_FLOOR,
        'ceil' => EXPR_CEIL,
        'pi' => EXPR_PI,
        'sqrt' => EXPR_SQRT,
    )

Definition at line 148 of file Expr.php.

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

extensions/ParserFunctions/Expr.php

Public Member Functions

Public Attributes