145 lines
4.6 KiB
JavaScript
145 lines
4.6 KiB
JavaScript
/*
|
|
Copyright (C) 2013 Yusuke Suzuki <utatane.tea@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.
|
|
*/
|
|
|
|
(function () {
|
|
'use strict';
|
|
|
|
function isExpression(node) {
|
|
if (node == null) { return false; }
|
|
switch (node.type) {
|
|
case 'ArrayExpression':
|
|
case 'AssignmentExpression':
|
|
case 'BinaryExpression':
|
|
case 'CallExpression':
|
|
case 'ConditionalExpression':
|
|
case 'FunctionExpression':
|
|
case 'Identifier':
|
|
case 'Literal':
|
|
case 'LogicalExpression':
|
|
case 'MemberExpression':
|
|
case 'NewExpression':
|
|
case 'ObjectExpression':
|
|
case 'SequenceExpression':
|
|
case 'ThisExpression':
|
|
case 'UnaryExpression':
|
|
case 'UpdateExpression':
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
function isIterationStatement(node) {
|
|
if (node == null) { return false; }
|
|
switch (node.type) {
|
|
case 'DoWhileStatement':
|
|
case 'ForInStatement':
|
|
case 'ForStatement':
|
|
case 'WhileStatement':
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
function isStatement(node) {
|
|
if (node == null) { return false; }
|
|
switch (node.type) {
|
|
case 'BlockStatement':
|
|
case 'BreakStatement':
|
|
case 'ContinueStatement':
|
|
case 'DebuggerStatement':
|
|
case 'DoWhileStatement':
|
|
case 'EmptyStatement':
|
|
case 'ExpressionStatement':
|
|
case 'ForInStatement':
|
|
case 'ForStatement':
|
|
case 'IfStatement':
|
|
case 'LabeledStatement':
|
|
case 'ReturnStatement':
|
|
case 'SwitchStatement':
|
|
case 'ThrowStatement':
|
|
case 'TryStatement':
|
|
case 'VariableDeclaration':
|
|
case 'WhileStatement':
|
|
case 'WithStatement':
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
function isSourceElement(node) {
|
|
return isStatement(node) || node != null && node.type === 'FunctionDeclaration';
|
|
}
|
|
|
|
function trailingStatement(node) {
|
|
switch (node.type) {
|
|
case 'IfStatement':
|
|
if (node.alternate != null) {
|
|
return node.alternate;
|
|
}
|
|
return node.consequent;
|
|
|
|
case 'LabeledStatement':
|
|
case 'ForStatement':
|
|
case 'ForInStatement':
|
|
case 'WhileStatement':
|
|
case 'WithStatement':
|
|
return node.body;
|
|
}
|
|
return null;
|
|
}
|
|
|
|
function isProblematicIfStatement(node) {
|
|
var current;
|
|
|
|
if (node.type !== 'IfStatement') {
|
|
return false;
|
|
}
|
|
if (node.alternate == null) {
|
|
return false;
|
|
}
|
|
current = node.consequent;
|
|
do {
|
|
if (current.type === 'IfStatement') {
|
|
if (current.alternate == null) {
|
|
return true;
|
|
}
|
|
}
|
|
current = trailingStatement(current);
|
|
} while (current);
|
|
|
|
return false;
|
|
}
|
|
|
|
module.exports = {
|
|
isExpression: isExpression,
|
|
isStatement: isStatement,
|
|
isIterationStatement: isIterationStatement,
|
|
isSourceElement: isSourceElement,
|
|
isProblematicIfStatement: isProblematicIfStatement,
|
|
|
|
trailingStatement: trailingStatement
|
|
};
|
|
}());
|
|
/* vim: set sw=4 ts=4 et tw=80 : */
|