144 lines
4.6 KiB
JavaScript
144 lines
4.6 KiB
JavaScript
/*
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Copyright (C) 2013 Yusuke Suzuki <utatane.tea@gmail.com>
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 'AS IS'
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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(function () {
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'use strict';
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function isExpression(node) {
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if (node == null) { return false; }
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switch (node.type) {
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case 'ArrayExpression':
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case 'AssignmentExpression':
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case 'BinaryExpression':
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case 'CallExpression':
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case 'ConditionalExpression':
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case 'FunctionExpression':
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case 'Identifier':
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case 'Literal':
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case 'LogicalExpression':
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case 'MemberExpression':
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case 'NewExpression':
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case 'ObjectExpression':
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case 'SequenceExpression':
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case 'ThisExpression':
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case 'UnaryExpression':
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case 'UpdateExpression':
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return true;
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}
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return false;
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}
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function isIterationStatement(node) {
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if (node == null) { return false; }
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switch (node.type) {
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case 'DoWhileStatement':
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case 'ForInStatement':
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case 'ForStatement':
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case 'WhileStatement':
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return true;
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}
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return false;
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}
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function isStatement(node) {
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if (node == null) { return false; }
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switch (node.type) {
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case 'BlockStatement':
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case 'BreakStatement':
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case 'ContinueStatement':
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case 'DebuggerStatement':
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case 'DoWhileStatement':
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case 'EmptyStatement':
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case 'ExpressionStatement':
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case 'ForInStatement':
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case 'ForStatement':
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case 'IfStatement':
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case 'LabeledStatement':
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case 'ReturnStatement':
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case 'SwitchStatement':
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case 'ThrowStatement':
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case 'TryStatement':
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case 'VariableDeclaration':
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case 'WhileStatement':
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case 'WithStatement':
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return true;
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}
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return false;
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}
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function isSourceElement(node) {
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return isStatement(node) || node != null && node.type === 'FunctionDeclaration';
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}
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function trailingStatement(node) {
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switch (node.type) {
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case 'IfStatement':
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if (node.alternate != null) {
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return node.alternate;
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}
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return node.consequent;
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case 'LabeledStatement':
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case 'ForStatement':
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case 'ForInStatement':
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case 'WhileStatement':
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case 'WithStatement':
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return node.body;
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}
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return null;
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}
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function isProblematicIfStatement(node) {
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var current;
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if (node.type !== 'IfStatement') {
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return false;
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}
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if (node.alternate == null) {
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return false;
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}
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current = node.consequent;
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do {
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if (current.type === 'IfStatement') {
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if (current.alternate == null) {
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return true;
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}
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}
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current = trailingStatement(current);
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} while (current);
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return false;
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}
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module.exports = {
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isExpression: isExpression,
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isStatement: isStatement,
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isIterationStatement: isIterationStatement,
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isSourceElement: isSourceElement,
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isProblematicIfStatement: isProblematicIfStatement,
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trailingStatement: trailingStatement
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};
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}());
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/* vim: set sw=4 ts=4 et tw=80 : */
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