GssFunction (closure-stylesheets 1.6.3 API)

All Known Implementing Classes:

GssFunctions.AddHsbToCssColor, GssFunctions.AddToNumericValue, GssFunctions.AdjustBrightness, GssFunctions.BaseBlendColors, GssFunctions.BlendColorsHsb, GssFunctions.BlendColorsRgb, GssFunctions.Concat, GssFunctions.Darken, GssFunctions.DesaturateColor, GssFunctions.Div, GssFunctions.Greyscale, GssFunctions.Lighten, GssFunctions.MakeContrastingColor, GssFunctions.MakeMutedColor, GssFunctions.MakeTranslucent, GssFunctions.MaxValue, GssFunctions.MinValue, GssFunctions.Mult, GssFunctions.SaturateColor, GssFunctions.SelectFrom, GssFunctions.Spin, GssFunctions.SubtractFromNumericValue
```
public interface GssFunction
```
Encapsulates a custom function callable from GSS stylesheet files.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.util.List<CssValueNode>`	`getCallResultNodes(java.util.List<CssValueNode> args, ErrorManager errorManager)`	Processes a list of function call arguments and returns a list of CssNodes representing this call's output, which replace the input nodes in the AST.
`java.lang.String`	`getCallResultString(java.util.List<java.lang.String> args)`	Processes a list of strings as function arguments and returns a string result.
`java.lang.Integer`	`getNumExpectedArguments()`	Returns the number of parsed arguments that this function takes, or `null` if the number of arguments may vary.

- Method Detail
  - getNumExpectedArguments
```
java.lang.Integer getNumExpectedArguments()
```
    Returns the number of parsed arguments that this function takes, or null if the number of arguments may vary.
  - getCallResultNodes
```
java.util.List<CssValueNode> getCallResultNodes(java.util.List<CssValueNode> args,
                                                ErrorManager errorManager)
                                         throws GssFunctionException
```
    Processes a list of function call arguments and returns a list of CssNodes representing this call's output, which replace the input nodes in the AST. Errors will be reported to the ErrorManager.
    
    Throws:
    
    GssFunctionException
  - getCallResultString
```
java.lang.String getCallResultString(java.util.List<java.lang.String> args)
                              throws GssFunctionException
```
    Processes a list of strings as function arguments and returns a string result. Errors are reported by throwing GssFunctionException.
    
    Throws:
    
    GssFunctionException