Package com.google.common.css.compiler.gssfunctions

Class GssFunctions.SubtractFromNumericValue

java.lang.Object

com.google.common.css.compiler.gssfunctions.GssFunctions.SubtractFromNumericValue

All Implemented Interfaces:

GssFunction

Enclosing class:

GssFunctions

public static class GssFunctions.SubtractFromNumericValue
extends Object

The "sub()" function subtracts a list of numeric values. SubtractFromNumericValue(a, b, c) evaluates to ((a - b) - c).

Constructor Summary

Constructors

Constructor	Description
SubtractFromNumericValue()

Method Summary

Modifier and Type	Method	Description
protected CssNumericNode	calculate(List<CssNumericNode> args, ErrorManager errorManager)
List<CssValueNode>	getCallResultNodes(List<CssValueNode> args, ErrorManager errorManager)	Returns a new value of the same unit as the original.
String	getCallResultString(List<String> args)	Processes a list of strings as function arguments and returns a string result.
Integer	getNumExpectedArguments()	Returns the number of expected arguments of this GSS function.
protected boolean	isIdentityValue(double value)	By default, this method returns false.
protected double	performOperation(double left, double right)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

SubtractFromNumericValue

public SubtractFromNumericValue()

Method Details

performOperation

protected double performOperation(double left,
 double right)

isIdentityValue

protected boolean isIdentityValue(double value)

By default, this method returns false.

Returns:

whether the identity value has no effect on the output. In this case, any units (px, pt, etc.) will be ignored.

getNumExpectedArguments

public Integer getNumExpectedArguments()

Returns the number of expected arguments of this GSS function.

Specified by:

getNumExpectedArguments in interface GssFunction

Returns:

Number of expected arguments

getCallResultNodes

public List<CssValueNode> getCallResultNodes(List<CssValueNode> args,
 ErrorManager errorManager)
                                      throws GssFunctionException

Returns a new value of the same unit as the original.

Specified by:

getCallResultNodes in interface GssFunction

Parameters:

args - The list of arguments

Returns:

The resulting fingerprint as a numeric node in a list

Throws:

GssFunctionException

getCallResultString

public String getCallResultString(List<String> args)
                           throws GssFunctionException

Description copied from interface: GssFunction

Processes a list of strings as function arguments and returns a string result. Errors are reported by throwing GssFunctionException.

Specified by:

getCallResultString in interface GssFunction

Throws:

GssFunctionException

calculate

protected CssNumericNode calculate(List<CssNumericNode> args,
 ErrorManager errorManager)
                            throws GssFunctionException

Throws:

GssFunctionException