source: trip-planner-front/node_modules/esutils/lib/ast.js@ 8d391a1

Last change on this file since 8d391a1 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit
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1/*
2 Copyright (C) 2013 Yusuke Suzuki <utatane.tea@gmail.com>
3
4 Redistribution and use in source and binary forms, with or without
5 modification, are permitted provided that the following conditions are met:
6
7 * Redistributions of source code must retain the above copyright
8 notice, this list of conditions and the following disclaimer.
9 * Redistributions in binary form must reproduce the above copyright
10 notice, this list of conditions and the following disclaimer in the
11 documentation and/or other materials provided with the distribution.
12
13 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 'AS IS'
14 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
17 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
18 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
19 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
20 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23*/
24
25(function () {
26 'use strict';
27
28 function isExpression(node) {
29 if (node == null) { return false; }
30 switch (node.type) {
31 case 'ArrayExpression':
32 case 'AssignmentExpression':
33 case 'BinaryExpression':
34 case 'CallExpression':
35 case 'ConditionalExpression':
36 case 'FunctionExpression':
37 case 'Identifier':
38 case 'Literal':
39 case 'LogicalExpression':
40 case 'MemberExpression':
41 case 'NewExpression':
42 case 'ObjectExpression':
43 case 'SequenceExpression':
44 case 'ThisExpression':
45 case 'UnaryExpression':
46 case 'UpdateExpression':
47 return true;
48 }
49 return false;
50 }
51
52 function isIterationStatement(node) {
53 if (node == null) { return false; }
54 switch (node.type) {
55 case 'DoWhileStatement':
56 case 'ForInStatement':
57 case 'ForStatement':
58 case 'WhileStatement':
59 return true;
60 }
61 return false;
62 }
63
64 function isStatement(node) {
65 if (node == null) { return false; }
66 switch (node.type) {
67 case 'BlockStatement':
68 case 'BreakStatement':
69 case 'ContinueStatement':
70 case 'DebuggerStatement':
71 case 'DoWhileStatement':
72 case 'EmptyStatement':
73 case 'ExpressionStatement':
74 case 'ForInStatement':
75 case 'ForStatement':
76 case 'IfStatement':
77 case 'LabeledStatement':
78 case 'ReturnStatement':
79 case 'SwitchStatement':
80 case 'ThrowStatement':
81 case 'TryStatement':
82 case 'VariableDeclaration':
83 case 'WhileStatement':
84 case 'WithStatement':
85 return true;
86 }
87 return false;
88 }
89
90 function isSourceElement(node) {
91 return isStatement(node) || node != null && node.type === 'FunctionDeclaration';
92 }
93
94 function trailingStatement(node) {
95 switch (node.type) {
96 case 'IfStatement':
97 if (node.alternate != null) {
98 return node.alternate;
99 }
100 return node.consequent;
101
102 case 'LabeledStatement':
103 case 'ForStatement':
104 case 'ForInStatement':
105 case 'WhileStatement':
106 case 'WithStatement':
107 return node.body;
108 }
109 return null;
110 }
111
112 function isProblematicIfStatement(node) {
113 var current;
114
115 if (node.type !== 'IfStatement') {
116 return false;
117 }
118 if (node.alternate == null) {
119 return false;
120 }
121 current = node.consequent;
122 do {
123 if (current.type === 'IfStatement') {
124 if (current.alternate == null) {
125 return true;
126 }
127 }
128 current = trailingStatement(current);
129 } while (current);
130
131 return false;
132 }
133
134 module.exports = {
135 isExpression: isExpression,
136 isStatement: isStatement,
137 isIterationStatement: isIterationStatement,
138 isSourceElement: isSourceElement,
139 isProblematicIfStatement: isProblematicIfStatement,
140
141 trailingStatement: trailingStatement
142 };
143}());
144/* vim: set sw=4 ts=4 et tw=80 : */
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