Package org.teavm.flavour.expr

This package contains classes necessary to parse, compile and evaluate expressions written on Flavour Expression Language (FEL).

See: Description

Interface Summary

Interface	Description
ClassResolver	This object is responsible for finding the class by its name as appears in the source code.
EvaluatorBuilder
Scope

Class Summary

Class	Description
ClassPathClassResolver	A ClassResolver that searches classes in ClassLoader.
Compiler	Compiles AST into execution plan, performing type checks.
CompilerCommons
Diagnostic
Evaluator<F,V>
ImportingClassResolver	Class resolver that is capable of searching the class by its simple names, if it was imported directly or its package was imported.
Interpreter
InterpretingEvaluatorBuilder
Location
MethodLookup
Parser
TypedPlan
TypeEstimator

Exception Summary

Exception	Description
InterpretationException
InvalidExpressionException

Annotation Types Summary

Annotation Type	Description
VariableName

Package org.teavm.flavour.expr Description

This package contains classes necessary to parse, compile and evaluate expressions written on Flavour Expression Language (FEL). FEL is mostly used in Flavour templates. Unlike most other expression language, this language is statically typed, that allows to verify templates in compile time.

Here are several examples of Flavour expressions:

• 23 – evaluates the number constant;
• x + 2 – evaluates sum;
• foo(x) – calls method of current context, shorthand for this.foo(x);
• v.bar – either gets value of bar field if it exists and is public, or calls v.getBar() method;

Using

Flavour expression passes the following phases:

• Parsing that gives AST (see org.teavm.flavour.expr.ast). The Parser class is responsible for this phase.
• Compilation that gives evaluation plan (see org.teavm.flavour.expr.plan). To compile expression from AST, use Compiler class.
• Evaluation that computes result of the expression according to evaluation plan. There are several ways of performing evaluation. The easiest one is to interpret plan using Interpreter

Full syntax

Author:

Alexey Andreev