com.whitestein.lsps.lang

Class Interpreter

java.lang.Object

com.whitestein.lsps.lang.Interpreter

public class Interpreter
extends Object

Interpreter of LSPS expression language. It interprets given Expression in context of given Namespace.

Author:

rba

Field Summary

Fields

Modifier and Type	Field and Description
static String	EXPRESSION_EXCEPTION_CONTEXT Exception context used when an error happens.

Constructor Summary

Constructors

Constructor and Description
Interpreter(Namespace namespace, ExpressionOrigin origin) Creates new instance of Interpreter.
Interpreter(Namespace namespace, InterpreterConfiguration configuration, ExpressionOrigin origin) Creates new instance of Interpreter.

Method Summary

Modifier and Type	Method and Description
FreeTypeMapping	currentMapping() Returns the FreeTypeMapping for current namespace.
InterpreterConfiguration	getConfiguration() Returns the interpreter configuration.
Namespace	getNamespace() Returns the current namespace.
ExpressionOrigin	getOrigin() Returns the expression origin.
Object	interpret(Expression expression) Interprets a given expression.
Object	interpret(Expression expression, InterpreterStackTrace stackTrace) Interprets a given expression.

Methods inherited from class java.lang.Object

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

Field Detail

EXPRESSION_EXCEPTION_CONTEXT

public static final String EXPRESSION_EXCEPTION_CONTEXT

Exception context used when an error happens.

See Also:

Constant Field Values

Constructor Detail

Interpreter

public Interpreter(Namespace namespace,
                   InterpreterConfiguration configuration,
                   ExpressionOrigin origin)

Creates new instance of Interpreter.

Parameters:

namespace - the namespace where the expressions are interpreted

configuration - configuration for interpreter

origin - the expression origin

Interpreter

public Interpreter(Namespace namespace,
                   ExpressionOrigin origin)

Creates new instance of Interpreter.

Parameters:

namespace -

origin - the expression origin

Method Detail

interpret

public final Object interpret(Expression expression)
                       throws ErrorException

Interprets a given expression.

Parameters:

expression -

Returns:

result of the interpretation

Throws:

ErrorException - if any exception is thrown during interpretation

NullPointerException - if expression is null

interpret

public Object interpret(Expression expression,
                        InterpreterStackTrace stackTrace)
                 throws ErrorException

Interprets a given expression.

Parameters:

expression -

stackTrace - interpreter stack trace

Returns:

result of the interpretation

Throws:

ErrorException - if any exception is thrown during interpretation

NullPointerException - if expression is null

getNamespace

public Namespace getNamespace()

Returns the current namespace.

Returns:

the current namespace

currentMapping

public FreeTypeMapping currentMapping()

Returns the FreeTypeMapping for current namespace.

Returns:

the FreeTypeMapping for current namespace

getConfiguration

public InterpreterConfiguration getConfiguration()

Returns the interpreter configuration.

Returns:

the interpreter configuration

getOrigin

public ExpressionOrigin getOrigin()

Returns the expression origin.

Returns:

the expression origin