/**
 * @fileoverview A factory for creating AST nodes
 * @author Fred K. Schott
 * @copyright 2014 Fred K. Schott. All rights reserved.
 * @copyright 2011-2013 Ariya Hidayat <ariya.hidayat@gmail.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

"use strict";

//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------

var astNodeTypes = require("./ast-node-types");

//------------------------------------------------------------------------------
// Public
//------------------------------------------------------------------------------

module.exports = {

    /**
     * Create an Array Expression ASTNode out of an array of elements
     * @param {ASTNode[]} elements An array of ASTNode elements
     * @returns {ASTNode} An ASTNode representing the entire array expression
     */
    createArrayExpression: function(elements) {
        return {
            type: astNodeTypes.ArrayExpression,
            elements: elements
        };
    },

    /**
     * Create an Arrow Function Expression ASTNode
     * @param {ASTNode} params The function arguments
     * @param {ASTNode} body The function body
     * @param {boolean} expression True if the arrow function is created via an expression.
     *      Always false for declarations, but kept here to be in sync with
     *      FunctionExpression objects.
     * @returns {ASTNode} An ASTNode representing the entire arrow function expression
     */
    createArrowFunctionExpression: function (params, body, expression) {
        return {
            type: astNodeTypes.ArrowFunctionExpression,
            id: null,
            params: params,
            body: body,
            generator: false,
            expression: expression
        };
    },

    /**
     * Create an ASTNode representation of an assignment expression
     * @param {ASTNode} operator The assignment operator
     * @param {ASTNode} left The left operand
     * @param {ASTNode} right The right operand
     * @returns {ASTNode} An ASTNode representing the entire assignment expression
     */
    createAssignmentExpression: function(operator, left, right) {
        return {
            type: astNodeTypes.AssignmentExpression,
            operator: operator,
            left: left,
            right: right
        };
    },

    /**
     * Create an ASTNode representation of an assignment pattern (default parameters)
     * @param {ASTNode} left The left operand
     * @param {ASTNode} right The right operand
     * @returns {ASTNode} An ASTNode representing the entire assignment pattern
     */
    createAssignmentPattern: function(left, right) {
        return {
            type: astNodeTypes.AssignmentPattern,
            left: left,
            right: right
        };
    },

    /**
     * Create an ASTNode representation of a binary expression
     * @param {ASTNode} operator The assignment operator
     * @param {ASTNode} left The left operand
     * @param {ASTNode} right The right operand
     * @returns {ASTNode} An ASTNode representing the entire binary expression
     */
    createBinaryExpression: function(operator, left, right) {
        var type = (operator === "||" || operator === "&&") ? astNodeTypes.LogicalExpression :
                    astNodeTypes.BinaryExpression;
        return {
            type: type,
            operator: operator,
            left: left,
            right: right
        };
    },

    /**
     * Create an ASTNode representation of a block statement
     * @param {ASTNode} body The block statement body
     * @returns {ASTNode} An ASTNode representing the entire block statement
     */
    createBlockStatement: function(body) {
        return {
            type: astNodeTypes.BlockStatement,
            body: body
        };
    },

    /**
     * Create an ASTNode representation of a break statement
     * @param {ASTNode} label The break statement label
     * @returns {ASTNode} An ASTNode representing the break statement
     */
    createBreakStatement: function(label) {
        return {
            type: astNodeTypes.BreakStatement,
            label: label
        };
    },

    /**
     * Create an ASTNode representation of a call expression
     * @param {ASTNode} callee The function being called
     * @param {ASTNode[]} args An array of ASTNodes representing the function call arguments
     * @returns {ASTNode} An ASTNode representing the entire call expression
     */
    createCallExpression: function(callee, args) {
        return {
            type: astNodeTypes.CallExpression,
            callee: callee,
            "arguments": args
        };
    },

    /**
     * Create an ASTNode representation of a catch clause/block
     * @param {ASTNode} param Any catch clause exeption/conditional parameter information
     * @param {ASTNode} body The catch block body
     * @returns {ASTNode} An ASTNode representing the entire catch clause
     */
    createCatchClause: function(param, body) {
        return {
            type: astNodeTypes.CatchClause,
            param: param,
            body: body
        };
    },

    /**
     * Creates an ASTNode representation of a class body.
     * @param {ASTNode} body The node representing the body of the class.
     * @returns {ASTNode} An ASTNode representing the class body.
     */
    createClassBody: function(body) {
        return {
            type: astNodeTypes.ClassBody,
            body: body
        };
    },

    createClassExpression: function(id, superClass, body) {
        return {
            type: astNodeTypes.ClassExpression,
            id: id,
            superClass: superClass,
            body: body
        };
    },

    createClassDeclaration: function(id, superClass, body) {
        return {
            type: astNodeTypes.ClassDeclaration,
            id: id,
            superClass: superClass,
            body: body
        };
    },

    createMethodDefinition: function(propertyType, kind, key, value, computed) {
        return {
            type: astNodeTypes.MethodDefinition,
            key: key,
            value: value,
            kind: kind,
            "static": propertyType === "static",
            computed: computed
        };
    },

    createMetaProperty: function(meta, property) {
        return {
            type: astNodeTypes.MetaProperty,
            meta: meta,
            property: property
        };
    },

    /**
     * Create an ASTNode representation of a conditional expression
     * @param {ASTNode} test The conditional to evaluate
     * @param {ASTNode} consequent The code to be run if the test returns true
     * @param {ASTNode} alternate The code to be run if the test returns false
     * @returns {ASTNode} An ASTNode representing the entire conditional expression
     */
    createConditionalExpression: function(test, consequent, alternate) {
        return {
            type: astNodeTypes.ConditionalExpression,
            test: test,
            consequent: consequent,
            alternate: alternate
        };
    },

    /**
     * Create an ASTNode representation of a continue statement
     * @param {?ASTNode} label The optional continue label (null if not set)
     * @returns {ASTNode} An ASTNode representing the continue statement
     */
    createContinueStatement: function(label) {
        return {
            type: astNodeTypes.ContinueStatement,
            label: label
        };
    },

    /**
     * Create an ASTNode representation of a debugger statement
     * @returns {ASTNode} An ASTNode representing the debugger statement
     */
    createDebuggerStatement: function() {
        return {
            type: astNodeTypes.DebuggerStatement
        };
    },

    /**
     * Create an ASTNode representation of an empty statement
     * @returns {ASTNode} An ASTNode representing an empty statement
     */
    createEmptyStatement: function() {
        return {
            type: astNodeTypes.EmptyStatement
        };
    },

    /**
     * Create an ASTNode representation of an expression statement
     * @param {ASTNode} expression The expression
     * @returns {ASTNode} An ASTNode representing an expression statement
     */
    createExpressionStatement: function(expression) {
        return {
            type: astNodeTypes.ExpressionStatement,
            expression: expression
        };
    },

    /**
     * Create an ASTNode representation of a while statement
     * @param {ASTNode} test The while conditional
     * @param {ASTNode} body The while loop body
     * @returns {ASTNode} An ASTNode representing a while statement
     */
    createWhileStatement: function(test, body) {
        return {
            type: astNodeTypes.WhileStatement,
            test: test,
            body: body
        };
    },

    /**
     * Create an ASTNode representation of a do..while statement
     * @param {ASTNode} test The do..while conditional
     * @param {ASTNode} body The do..while loop body
     * @returns {ASTNode} An ASTNode representing a do..while statement
     */
    createDoWhileStatement: function(test, body) {
        return {
            type: astNodeTypes.DoWhileStatement,
            body: body,
            test: test
        };
    },

    /**
     * Create an ASTNode representation of a for statement
     * @param {ASTNode} init The initialization expression
     * @param {ASTNode} test The conditional test expression
     * @param {ASTNode} update The update expression
     * @param {ASTNode} body The statement body
     * @returns {ASTNode} An ASTNode representing a for statement
     */
    createForStatement: function(init, test, update, body) {
        return {
            type: astNodeTypes.ForStatement,
            init: init,
            test: test,
            update: update,
            body: body
        };
    },

    /**
     * Create an ASTNode representation of a for..in statement
     * @param {ASTNode} left The left-side variable for the property name
     * @param {ASTNode} right The right-side object
     * @param {ASTNode} body The statement body
     * @returns {ASTNode} An ASTNode representing a for..in statement
     */
    createForInStatement: function(left, right, body) {
        return {
            type: astNodeTypes.ForInStatement,
            left: left,
            right: right,
            body: body,
            each: false
        };
    },

    /**
     * Create an ASTNode representation of a for..of statement
     * @param {ASTNode} left The left-side variable for the property value
     * @param {ASTNode} right The right-side object
     * @param {ASTNode} body The statement body
     * @returns {ASTNode} An ASTNode representing a for..of statement
     */
    createForOfStatement: function(left, right, body) {
        return {
            type: astNodeTypes.ForOfStatement,
            left: left,
            right: right,
            body: body
        };
    },

    /**
     * Create an ASTNode representation of a function declaration
     * @param {ASTNode} id The function name
     * @param {ASTNode} params The function arguments
     * @param {ASTNode} body The function body
     * @param {boolean} generator True if the function is a generator, false if not.
     * @param {boolean} expression True if the function is created via an expression.
     *      Always false for declarations, but kept here to be in sync with
     *      FunctionExpression objects.
     * @returns {ASTNode} An ASTNode representing a function declaration
     */
    createFunctionDeclaration: function (id, params, body, generator, expression) {
        return {
            type: astNodeTypes.FunctionDeclaration,
            id: id,
            params: params || [],
            body: body,
            generator: !!generator,
            expression: !!expression
        };
    },

    /**
     * Create an ASTNode representation of a function expression
     * @param {ASTNode} id The function name
     * @param {ASTNode} params The function arguments
     * @param {ASTNode} body The function body
     * @param {boolean} generator True if the function is a generator, false if not.
     * @param {boolean} expression True if the function is created via an expression.
     * @returns {ASTNode} An ASTNode representing a function declaration
     */
    createFunctionExpression: function (id, params, body, generator, expression) {
        return {
            type: astNodeTypes.FunctionExpression,
            id: id,
            params: params || [],
            body: body,
            generator: !!generator,
            expression: !!expression
        };
    },

    /**
     * Create an ASTNode representation of an identifier
     * @param {ASTNode} name The identifier name
     * @returns {ASTNode} An ASTNode representing an identifier
     */
    createIdentifier: function(name) {
        return {
            type: astNodeTypes.Identifier,
            name: name
        };
    },

    /**
     * Create an ASTNode representation of an if statement
     * @param {ASTNode} test The if conditional expression
     * @param {ASTNode} consequent The consequent if statement to run
     * @param {ASTNode} alternate the "else" alternate statement
     * @returns {ASTNode} An ASTNode representing an if statement
     */
    createIfStatement: function(test, consequent, alternate) {
        return {
            type: astNodeTypes.IfStatement,
            test: test,
            consequent: consequent,
            alternate: alternate
        };
    },

    /**
     * Create an ASTNode representation of a labeled statement
     * @param {ASTNode} label The statement label
     * @param {ASTNode} body The labeled statement body
     * @returns {ASTNode} An ASTNode representing a labeled statement
     */
    createLabeledStatement: function(label, body) {
        return {
            type: astNodeTypes.LabeledStatement,
            label: label,
            body: body
        };
    },

    /**
     * Create an ASTNode literal from the source code
     * @param {ASTNode} token The ASTNode token
     * @param {string} source The source code to get the literal from
     * @returns {ASTNode} An ASTNode representing the new literal
     */
    createLiteralFromSource: function(token, source) {
        var node = {
            type: astNodeTypes.Literal,
            value: token.value,
            raw: source.slice(token.range[0], token.range[1])
        };

        // regular expressions have regex properties
        if (token.regex) {
            node.regex = token.regex;
        }

        return node;
    },

    /**
     * Create an ASTNode template element
     * @param {Object} value Data on the element value
     * @param {string} value.raw The raw template string
     * @param {string} value.cooked The processed template string
     * @param {boolean} tail True if this is the final element in a template string
     * @returns {ASTNode} An ASTNode representing the template string element
     */
    createTemplateElement: function(value, tail) {
        return {
            type: astNodeTypes.TemplateElement,
            value: value,
            tail: tail
        };
    },

    /**
     * Create an ASTNode template literal
     * @param {ASTNode[]} quasis An array of the template string elements
     * @param {ASTNode[]} expressions An array of the template string expressions
     * @returns {ASTNode} An ASTNode representing the template string
     */
    createTemplateLiteral: function(quasis, expressions) {
        return {
            type: astNodeTypes.TemplateLiteral,
            quasis: quasis,
            expressions: expressions
        };
    },

    /**
     * Create an ASTNode representation of a spread element
     * @param {ASTNode} argument The array being spread
     * @returns {ASTNode} An ASTNode representing a spread element
     */
    createSpreadElement: function(argument) {
        return {
            type: astNodeTypes.SpreadElement,
            argument: argument
        };
    },

    /**
     * Create an ASTNode representation of an experimental rest property
     * @param {ASTNode} argument The identifier being rested
     * @returns {ASTNode} An ASTNode representing a rest element
     */
    createExperimentalRestProperty: function(argument) {
        return {
            type: astNodeTypes.ExperimentalRestProperty,
            argument: argument
        };
    },

    /**
     * Create an ASTNode representation of an experimental spread property
     * @param {ASTNode} argument The identifier being spread
     * @returns {ASTNode} An ASTNode representing a spread element
     */
    createExperimentalSpreadProperty: function(argument) {
        return {
            type: astNodeTypes.ExperimentalSpreadProperty,
            argument: argument
        };
    },

    /**
     * Create an ASTNode tagged template expression
     * @param {ASTNode} tag The tag expression
     * @param {ASTNode} quasi A TemplateLiteral ASTNode representing
     * the template string itself.
     * @returns {ASTNode} An ASTNode representing the tagged template
     */
    createTaggedTemplateExpression: function(tag, quasi) {
        return {
            type: astNodeTypes.TaggedTemplateExpression,
            tag: tag,
            quasi: quasi
        };
    },

    /**
     * Create an ASTNode representation of a member expression
     * @param {string} accessor The member access method (bracket or period)
     * @param {ASTNode} object The object being referenced
     * @param {ASTNode} property The object-property being referenced
     * @returns {ASTNode} An ASTNode representing a member expression
     */
    createMemberExpression: function(accessor, object, property) {
        return {
            type: astNodeTypes.MemberExpression,
            computed: accessor === "[",
            object: object,
            property: property
        };
    },

    /**
     * Create an ASTNode representation of a new expression
     * @param {ASTNode} callee The constructor for the new object type
     * @param {ASTNode} args The arguments passed to the constructor
     * @returns {ASTNode} An ASTNode representing a new expression
     */
    createNewExpression: function(callee, args) {
        return {
            type: astNodeTypes.NewExpression,
            callee: callee,
            "arguments": args
        };
    },

    /**
     * Create an ASTNode representation of a new object expression
     * @param {ASTNode[]} properties An array of ASTNodes that represent all object
     *      properties and associated values
     * @returns {ASTNode} An ASTNode representing a new object expression
     */
    createObjectExpression: function(properties) {
        return {
            type: astNodeTypes.ObjectExpression,
            properties: properties
        };
    },

    /**
     * Create an ASTNode representation of a postfix expression
     * @param {string} operator The postfix operator ("++", "--", etc.)
     * @param {ASTNode} argument The operator argument
     * @returns {ASTNode} An ASTNode representing a postfix expression
     */
    createPostfixExpression: function(operator, argument) {
        return {
            type: astNodeTypes.UpdateExpression,
            operator: operator,
            argument: argument,
            prefix: false
        };
    },

    /**
     * Create an ASTNode representation of an entire program
     * @param {ASTNode} body The program body
     * @param {string} sourceType Either "module" or "script".
     * @returns {ASTNode} An ASTNode representing an entire program
     */
    createProgram: function(body, sourceType) {
        return {
            type: astNodeTypes.Program,
            body: body,
            sourceType: sourceType
        };
    },

    /**
     * Create an ASTNode representation of an object property
     * @param {string} kind The type of property represented ("get", "set", etc.)
     * @param {ASTNode} key The property key
     * @param {ASTNode} value The new property value
     * @param {boolean} method True if the property is also a method (value is a function)
     * @param {boolean} shorthand True if the property is shorthand
     * @param {boolean} computed True if the property value has been computed
     * @returns {ASTNode} An ASTNode representing an object property
     */
    createProperty: function(kind, key, value, method, shorthand, computed) {
        return {
            type: astNodeTypes.Property,
            key: key,
            value: value,
            kind: kind,
            method: method,
            shorthand: shorthand,
            computed: computed
        };
    },

    /**
     * Create an ASTNode representation of a rest element
     * @param {ASTNode} argument The rest argument
     * @returns {ASTNode} An ASTNode representing a rest element
     */
    createRestElement: function (argument) {
        return {
            type: astNodeTypes.RestElement,
            argument: argument
        };
    },

    /**
     * Create an ASTNode representation of a return statement
     * @param {?ASTNode} argument The return argument, null if no argument is provided
     * @returns {ASTNode} An ASTNode representing a return statement
     */
    createReturnStatement: function(argument) {
        return {
            type: astNodeTypes.ReturnStatement,
            argument: argument
        };
    },

    /**
     * Create an ASTNode representation of a sequence of expressions
     * @param {ASTNode[]} expressions An array containing each expression, in order
     * @returns {ASTNode} An ASTNode representing a sequence of expressions
     */
    createSequenceExpression: function(expressions) {
        return {
            type: astNodeTypes.SequenceExpression,
            expressions: expressions
        };
    },

    /**
     * Create an ASTNode representation of super
     * @returns {ASTNode} An ASTNode representing super
     */
    createSuper: function() {
        return {
            type: astNodeTypes.Super
        };
    },

    /**
     * Create an ASTNode representation of a switch case statement
     * @param {ASTNode} test The case value to test against the switch value
     * @param {ASTNode} consequent The consequent case statement
     * @returns {ASTNode} An ASTNode representing a switch case
     */
    createSwitchCase: function(test, consequent) {
        return {
            type: astNodeTypes.SwitchCase,
            test: test,
            consequent: consequent
        };
    },

    /**
     * Create an ASTNode representation of a switch statement
     * @param {ASTNode} discriminant An expression to test against each case value
     * @param {ASTNode[]} cases An array of switch case statements
     * @returns {ASTNode} An ASTNode representing a switch statement
     */
    createSwitchStatement: function(discriminant, cases) {
        return {
            type: astNodeTypes.SwitchStatement,
            discriminant: discriminant,
            cases: cases
        };
    },

    /**
     * Create an ASTNode representation of a this statement
     * @returns {ASTNode} An ASTNode representing a this statement
     */
    createThisExpression: function() {
        return {
            type: astNodeTypes.ThisExpression
        };
    },

    /**
     * Create an ASTNode representation of a throw statement
     * @param {ASTNode} argument The argument to throw
     * @returns {ASTNode} An ASTNode representing a throw statement
     */
    createThrowStatement: function(argument) {
        return {
            type: astNodeTypes.ThrowStatement,
            argument: argument
        };
    },

    /**
     * Create an ASTNode representation of a try statement
     * @param {ASTNode} block The try block
     * @param {ASTNode} handler A catch handler
     * @param {?ASTNode} finalizer The final code block to run after the try/catch has run
     * @returns {ASTNode} An ASTNode representing a try statement
     */
    createTryStatement: function(block, handler, finalizer) {
        return {
            type: astNodeTypes.TryStatement,
            block: block,
            handler: handler,
            finalizer: finalizer
        };
    },

    /**
     * Create an ASTNode representation of a unary expression
     * @param {string} operator The unary operator
     * @param {ASTNode} argument The unary operand
     * @returns {ASTNode} An ASTNode representing a unary expression
     */
    createUnaryExpression: function(operator, argument) {
        if (operator === "++" || operator === "--") {
            return {
                type: astNodeTypes.UpdateExpression,
                operator: operator,
                argument: argument,
                prefix: true
            };
        }
        return {
            type: astNodeTypes.UnaryExpression,
            operator: operator,
            argument: argument,
            prefix: true
        };
    },

    /**
     * Create an ASTNode representation of a variable declaration
     * @param {ASTNode[]} declarations An array of variable declarations
     * @param {string} kind The kind of variable created ("var", "let", etc.)
     * @returns {ASTNode} An ASTNode representing a variable declaration
     */
    createVariableDeclaration: function(declarations, kind) {
        return {
            type: astNodeTypes.VariableDeclaration,
            declarations: declarations,
            kind: kind
        };
    },

    /**
     * Create an ASTNode representation of a variable declarator
     * @param {ASTNode} id The variable ID
     * @param {ASTNode} init The variable's initial value
     * @returns {ASTNode} An ASTNode representing a variable declarator
     */
    createVariableDeclarator: function(id, init) {
        return {
            type: astNodeTypes.VariableDeclarator,
            id: id,
            init: init
        };
    },

    /**
     * Create an ASTNode representation of a with statement
     * @param {ASTNode} object The with statement object expression
     * @param {ASTNode} body The with statement body
     * @returns {ASTNode} An ASTNode representing a with statement
     */
    createWithStatement: function(object, body) {
        return {
            type: astNodeTypes.WithStatement,
            object: object,
            body: body
        };
    },

    createYieldExpression: function(argument, delegate) {
        return {
            type: astNodeTypes.YieldExpression,
            argument: argument || null,
            delegate: delegate
        };
    },

    createJSXAttribute: function(name, value) {
        return {
            type: astNodeTypes.JSXAttribute,
            name: name,
            value: value || null
        };
    },

    createJSXSpreadAttribute: function(argument) {
        return {
            type: astNodeTypes.JSXSpreadAttribute,
            argument: argument
        };
    },

    createJSXIdentifier: function(name) {
        return {
            type: astNodeTypes.JSXIdentifier,
            name: name
        };
    },

    createJSXNamespacedName: function(namespace, name) {
        return {
            type: astNodeTypes.JSXNamespacedName,
            namespace: namespace,
            name: name
        };
    },

    createJSXMemberExpression: function(object, property) {
        return {
            type: astNodeTypes.JSXMemberExpression,
            object: object,
            property: property
        };
    },

    createJSXElement: function(openingElement, closingElement, children) {
        return {
            type: astNodeTypes.JSXElement,
            openingElement: openingElement,
            closingElement: closingElement,
            children: children
        };
    },

    createJSXEmptyExpression: function() {
        return {
            type: astNodeTypes.JSXEmptyExpression
        };
    },

    createJSXExpressionContainer: function(expression) {
        return {
            type: astNodeTypes.JSXExpressionContainer,
            expression: expression
        };
    },

    createJSXOpeningElement: function(name, attributes, selfClosing) {
        return {
            type: astNodeTypes.JSXOpeningElement,
            name: name,
            selfClosing: selfClosing,
            attributes: attributes
        };
    },

    createJSXClosingElement: function(name) {
        return {
            type: astNodeTypes.JSXClosingElement,
            name: name
        };
    },

    createExportSpecifier: function(local, exported) {
        return {
            type: astNodeTypes.ExportSpecifier,
            exported: exported || local,
            local: local
        };
    },

    createImportDefaultSpecifier: function(local) {
        return {
            type: astNodeTypes.ImportDefaultSpecifier,
            local: local
        };
    },

    createImportNamespaceSpecifier: function(local) {
        return {
            type: astNodeTypes.ImportNamespaceSpecifier,
            local: local
        };
    },

    createExportNamedDeclaration: function(declaration, specifiers, source) {
        return {
            type: astNodeTypes.ExportNamedDeclaration,
            declaration: declaration,
            specifiers: specifiers,
            source: source
        };
    },

    createExportDefaultDeclaration: function(declaration) {
        return {
            type: astNodeTypes.ExportDefaultDeclaration,
            declaration: declaration
        };
    },

    createExportAllDeclaration: function(source) {
        return {
            type: astNodeTypes.ExportAllDeclaration,
            source: source
        };
    },

    createImportSpecifier: function(local, imported) {
        return {
            type: astNodeTypes.ImportSpecifier,
            local: local || imported,
            imported: imported
        };
    },

    createImportDeclaration: function(specifiers, source) {
        return {
            type: astNodeTypes.ImportDeclaration,
            specifiers: specifiers,
            source: source
        };
    }

};