sirius.tagliatelle.expression

Interface Expression

All Known Implementing Classes:

AndOperation, BooleanOperation, Call, ConcatExpression, ConstantBoolean, ConstantClass, ConstantEnum, ConstantExpression, ConstantInt, ConstantNull, ConstantString, EqualsOperation, InstanceCheck, IntOperation, MacroCall, MethodCall, NativeCast, Negation, NoodleOperation, OrOperation, ReadGlobal, ReadLocal, RelationalIntOperation, RenderEmitterExpression, TenaryOperation, TransformerCast

public interface Expression

Represents a node of the expression AST.

Method Summary

Modifier and Type	Method and Description
Expression	copy() Creates a deep copy of the expression which can be modified without affecting the original expression.
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	propagateVisitor(ExpressionVisitor visitor) Visits all child nodes and then the node itself.
Expression	reduce() Reduces and optimizes the expression if possible.

Method Detail

eval

Object eval(LocalRenderContext ctx)

Evaluates the expression into an object using the given context.

Parameters:

ctx - the current rendering context

Returns:

the result of the evaluation

propagateVisitor

Expression propagateVisitor(ExpressionVisitor visitor)

Visits all child nodes and then the node itself.

Parameters:

visitor - the visitor to invoke for all child nodes and on the node itself

Returns:

the result of the invocation of the given visitor on this node

reduce

Expression reduce()

Reduces and optimizes the expression if possible.

Returns:

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

isConstant

boolean isConstant()

Determines if the expression is constant.

Returns:

true if the expression is constant, false otherwise

copy

Expression copy()

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

Returns:

a deep copy of the expression

getType

Class<?> getType()

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

Returns:

the type of objects created by this expression