/**
* Copyright (c) 2012-2016 André Bargull
* Alle Rechte vorbehalten / All Rights Reserved. Use is subject to license terms.
*
* <https://github.com/anba/es6draft>
*/
package com.github.anba.es6draft.ast;
/**
* <h1>15 ECMAScript Language: Scripts and Modules</h1><br>
* <h2>15.2 Modules</h2>
* <ul>
* <li>15.2.3 Exports
* </ul>
*/
public final class ExportDeclaration extends ModuleItem {
private final Type type;
private final String moduleSpecifier;
private final ExportClause exportClause;
private final ExportDefaultExpression expression;
private final VariableStatement variableStatement;
private final Declaration declaration;
/**
* The export declaration type.
*/
public enum Type {
/**
* Export type: {@code export * from module}
*/
All,
/**
* Export type: {@code export <thing> from module}
*/
External,
/**
* Export type: {@code export <thing>}
*/
Local,
/**
* Export type: {@code export var}
*/
Variable,
/**
* Export type: {@code export <declaration>}
*/
Declaration,
/**
* Export type: {@code export default <function>}
*/
DefaultHoistableDeclaration,
/**
* Export type: {@code export default <class>}
*/
DefaultClassDeclaration,
/**
* Export type: {@code export default <expression>}
*/
DefaultExpression
}
/**
* <pre>
* ExportDeclaration :
* export * FromClause ;
* </pre>
*
* @param beginPosition
* the source begin position
* @param endPosition
* the source end position
* @param moduleSpecifier
* the requested module name
*/
public ExportDeclaration(long beginPosition, long endPosition, String moduleSpecifier) {
super(beginPosition, endPosition);
this.type = Type.All;
this.moduleSpecifier = moduleSpecifier;
this.exportClause = null;
this.expression = null;
this.variableStatement = null;
this.declaration = null;
}
/**
* <pre>
* ExportDeclaration :
* export ExportClause FromClause ;
* export ExportClause ;
* </pre>
*
* @param beginPosition
* the source begin position
* @param endPosition
* the source end position
* @param exportClause
* the export clause
* @param moduleSpecifier
* the requested module name or {@code null}
*/
public ExportDeclaration(long beginPosition, long endPosition, ExportClause exportClause,
String moduleSpecifier) {
super(beginPosition, endPosition);
this.type = moduleSpecifier != null ? Type.External : Type.Local;
this.moduleSpecifier = moduleSpecifier;
this.exportClause = exportClause;
this.expression = null;
this.variableStatement = null;
this.declaration = null;
}
/**
* <pre>
* ExportDeclaration :
* export VariableStatement
* </pre>
*
* @param beginPosition
* the source begin position
* @param endPosition
* the source end position
* @param variableStatement
* the variable statement node
*/
public ExportDeclaration(long beginPosition, long endPosition,
VariableStatement variableStatement) {
super(beginPosition, endPosition);
this.type = Type.Variable;
this.moduleSpecifier = null;
this.exportClause = null;
this.expression = null;
this.variableStatement = variableStatement;
this.declaration = null;
}
/**
* <pre>
* ExportDeclaration :
* export Declaration
* </pre>
*
* @param beginPosition
* the source begin position
* @param endPosition
* the source end position
* @param declaration
* the declaration node
*/
public ExportDeclaration(long beginPosition, long endPosition, Declaration declaration) {
super(beginPosition, endPosition);
this.type = Type.Declaration;
this.moduleSpecifier = null;
this.exportClause = null;
this.expression = null;
this.variableStatement = null;
this.declaration = declaration;
}
/**
* <pre>
* ExportDeclaration :
* export default HoistableDeclaration<span><sub>[Default]</sub></span>
* </pre>
*
* @param beginPosition
* the source begin position
* @param endPosition
* the source end position
* @param declaration
* the hoistable declaration node
*/
public ExportDeclaration(long beginPosition, long endPosition, HoistableDeclaration declaration) {
super(beginPosition, endPosition);
this.type = Type.DefaultHoistableDeclaration;
this.moduleSpecifier = null;
this.exportClause = null;
this.expression = null;
this.variableStatement = null;
this.declaration = declaration;
}
/**
* <pre>
* ExportDeclaration :
* export default ClassDeclaration<span><sub>[Default]</sub></span>
* </pre>
*
* @param beginPosition
* the source begin position
* @param endPosition
* the source end position
* @param declaration
* the class declaration node
*/
public ExportDeclaration(long beginPosition, long endPosition, ClassDeclaration declaration) {
super(beginPosition, endPosition);
this.type = Type.DefaultClassDeclaration;
this.moduleSpecifier = null;
this.exportClause = null;
this.expression = null;
this.variableStatement = null;
this.declaration = declaration;
}
/**
* <pre>
* ExportDeclaration :
* export default [lookahead ∉ { <b>function</b>, <b>class</b> }] AssignmentExpression<span><sub>[In]</sub></span> ;
* </pre>
*
* @param beginPosition
* the source begin position
* @param endPosition
* the source end position
* @param expression
* the default export expression node
*/
public ExportDeclaration(long beginPosition, long endPosition,
ExportDefaultExpression expression) {
super(beginPosition, endPosition);
this.type = Type.DefaultExpression;
this.moduleSpecifier = null;
this.exportClause = null;
this.expression = expression;
this.variableStatement = null;
this.declaration = null;
}
/**
* Returns the export declaration type.
*
* @return the export type
*/
public Type getType() {
return type;
}
/**
* Returns the module specifier for "{@code export * from <module>}" or "{@code export ... from
* <module>}" export declarations.
*
* @return the module specifier
*/
public String getModuleSpecifier() {
assert type == Type.All || type == Type.External : "Type=" + type;
return moduleSpecifier;
}
/**
* Returns the export clause node.
*
* @return the export clause
*/
public ExportClause getExportClause() {
assert type == Type.Local || type == Type.External : "Type=" + type;
return exportClause;
}
/**
* Returns the exported default expression for {@code export default <expression>}.
*
* @return the exported default expression
*/
public ExportDefaultExpression getExpression() {
assert type == Type.DefaultExpression : "Type=" + type;
return expression;
}
/**
* Returns the exported variable statement for {@code export var <...>}.
*
* @return the exported variable statement
*/
public VariableStatement getVariableStatement() {
assert type == Type.Variable : "Type=" + type;
return variableStatement;
}
/**
* Returns the exported declaration for {@code export <declaration>}.
*
* @return the exported declaration
*/
public Declaration getDeclaration() {
assert type == Type.Declaration : "Type=" + type;
return declaration;
}
/**
* Returns the hoistable declaration for {@code export default function <...>}.
*
* @return the default export hoistable declaration
*/
public HoistableDeclaration getHoistableDeclaration() {
assert type == Type.DefaultHoistableDeclaration : "Type=" + type;
return (HoistableDeclaration) declaration;
}
/**
* Returns the class declaration for {@code export default class <...>}.
*
* @return the default export class declaration
*/
public ClassDeclaration getClassDeclaration() {
assert type == Type.DefaultClassDeclaration : "Type=" + type;
return (ClassDeclaration) declaration;
}
@Override
public <R, V> R accept(NodeVisitor<R, V> visitor, V value) {
return visitor.visit(this, value);
}
@Override
public <V> int accept(IntNodeVisitor<V> visitor, V value) {
return visitor.visit(this, value);
}
@Override
public <V> void accept(VoidNodeVisitor<V> visitor, V value) {
visitor.visit(this, value);
}
}