sirius.tagliatelle.expression

Class MacroCall

java.lang.Object

sirius.tagliatelle.expression.Call

sirius.tagliatelle.expression.MacroCall

All Implemented Interfaces:

Expression

public class MacroCall
extends Call

Invokes a Macro at runtime.

Field Summary

Fields inherited from class sirius.tagliatelle.expression.Call

NO_ARGS, parameterExpressions

Constructor Summary

Constructors

Constructor and Description
MacroCall()

Method Summary

Modifier and Type	Method and Description
void	bind(parsii.tokenizer.Position position, CompilationContext context, String macroName) Actually tells the macro to try to resolve an appropriate Macro to invoke.
Expression	copy() Creates a deep copy of the expression which can be modified without affecting the original expression.
Expression	dereference(Template template, Function<String,Emitter> blocks) Transforms all macros that access blocks of the LocalRenderContext into alternative expressions.
Object	eval(LocalRenderContext ctx) Evaluates the expression into an object using the given context.
Class<?>	getType() Returns the Java class of the objects yielded by this expression.
boolean	isConstant() Determines if the expression is constant.
Expression	reduce() Reduces and optimizes the expression if possible.
String	toString()
void	verify() Permits the marco to verify its parameters.

Methods inherited from class sirius.tagliatelle.expression.Call

copyParametersTo, propagateVisitor, setParameters

Methods inherited from class java.lang.Object

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

Constructor Detail

MacroCall

public MacroCall()

Method Detail

copy

public Expression copy()

Description copied from interface: Expression

Creates a deep copy of the expression which can be modified without affecting the original expression.

Returns:

a deep copy of the expression

reduce

public Expression reduce()

Description copied from interface: Expression

Reduces and optimizes the expression if possible.

Returns:

either the node itself or an optimized / reduced version if possible

isConstant

public boolean isConstant()

Description copied from interface: Expression

Determines if the expression is constant.

Specified by:

isConstant in interface Expression

Overrides:

isConstant in class Call

Returns:

true if the expression is constant, false otherwise

eval

public Object eval(LocalRenderContext ctx)

Description copied from interface: Expression

Evaluates the expression into an object using the given context.

Parameters:

ctx - the current rendering context

Returns:

the result of the evaluation

getType

public Class<?> getType()

Description copied from interface: Expression

Returns the Java class of the objects yielded by this expression.

Returns:

the type of objects created by this expression

bind

public void bind(parsii.tokenizer.Position position,
                 CompilationContext context,
                 String macroName)

Actually tells the macro to try to resolve an appropriate Macro to invoke.

Parameters:

position - the current position, used for error reports

context - the compilation context

macroName - the name of the macro

toString

public String toString()

Overrides:

toString in class Object

verify

public void verify()

Permits the marco to verify its parameters.

If one or more arguments are invalid an IllegalArgumentException can be thrown.

dereference

public Expression dereference(Template template,
                              Function<String,Emitter> blocks)

Transforms all macros that access blocks of the LocalRenderContext into alternative expressions.

Parameters:

template - the template for which the blocks are dereferenced

blocks - the provider to resolve a block name into an Emitter

Returns:

the replacement expression for the macro call