source: trip-planner-front/node_modules/terser/lib/equivalent-to.js@ bdd6491

Last change on this file since bdd6491 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 6.9 KB
Line 
1import {
2 AST_Array,
3 AST_Atom,
4 AST_Await,
5 AST_BigInt,
6 AST_Binary,
7 AST_Block,
8 AST_Call,
9 AST_Catch,
10 AST_Chain,
11 AST_Class,
12 AST_ClassProperty,
13 AST_ConciseMethod,
14 AST_Conditional,
15 AST_Debugger,
16 AST_Definitions,
17 AST_Destructuring,
18 AST_Directive,
19 AST_Do,
20 AST_Dot,
21 AST_DotHash,
22 AST_EmptyStatement,
23 AST_Expansion,
24 AST_Export,
25 AST_Finally,
26 AST_For,
27 AST_ForIn,
28 AST_ForOf,
29 AST_If,
30 AST_Import,
31 AST_ImportMeta,
32 AST_Jump,
33 AST_LabeledStatement,
34 AST_Lambda,
35 AST_LoopControl,
36 AST_NameMapping,
37 AST_NewTarget,
38 AST_Node,
39 AST_Number,
40 AST_Object,
41 AST_ObjectGetter,
42 AST_ObjectKeyVal,
43 AST_ObjectProperty,
44 AST_ObjectSetter,
45 AST_PrefixedTemplateString,
46 AST_PropAccess,
47 AST_RegExp,
48 AST_Sequence,
49 AST_SimpleStatement,
50 AST_String,
51 AST_Super,
52 AST_Switch,
53 AST_SwitchBranch,
54 AST_Symbol,
55 AST_TemplateSegment,
56 AST_TemplateString,
57 AST_This,
58 AST_Toplevel,
59 AST_Try,
60 AST_Unary,
61 AST_VarDef,
62 AST_While,
63 AST_With,
64 AST_Yield
65} from "./ast.js";
66
67const shallow_cmp = (node1, node2) => {
68 return (
69 node1 === null && node2 === null
70 || node1.TYPE === node2.TYPE && node1.shallow_cmp(node2)
71 );
72};
73
74export const equivalent_to = (tree1, tree2) => {
75 if (!shallow_cmp(tree1, tree2)) return false;
76 const walk_1_state = [tree1];
77 const walk_2_state = [tree2];
78
79 const walk_1_push = walk_1_state.push.bind(walk_1_state);
80 const walk_2_push = walk_2_state.push.bind(walk_2_state);
81
82 while (walk_1_state.length && walk_2_state.length) {
83 const node_1 = walk_1_state.pop();
84 const node_2 = walk_2_state.pop();
85
86 if (!shallow_cmp(node_1, node_2)) return false;
87
88 node_1._children_backwards(walk_1_push);
89 node_2._children_backwards(walk_2_push);
90
91 if (walk_1_state.length !== walk_2_state.length) {
92 // Different number of children
93 return false;
94 }
95 }
96
97 return walk_1_state.length == 0 && walk_2_state.length == 0;
98};
99
100// Creates a shallow compare function
101const mkshallow = (props) => {
102 const comparisons = Object
103 .keys(props)
104 .map(key => {
105 if (props[key] === "eq") {
106 return `this.${key} === other.${key}`;
107 } else if (props[key] === "exist") {
108 return `(this.${key} == null ? other.${key} == null : this.${key} === other.${key})`;
109 } else {
110 throw new Error(`mkshallow: Unexpected instruction: ${props[key]}`);
111 }
112 })
113 .join(" && ");
114
115 return new Function("other", "return " + comparisons);
116};
117
118const pass_through = () => true;
119
120AST_Node.prototype.shallow_cmp = function () {
121 throw new Error("did not find a shallow_cmp function for " + this.constructor.name);
122};
123
124AST_Debugger.prototype.shallow_cmp = pass_through;
125
126AST_Directive.prototype.shallow_cmp = mkshallow({ value: "eq" });
127
128AST_SimpleStatement.prototype.shallow_cmp = pass_through;
129
130AST_Block.prototype.shallow_cmp = pass_through;
131
132AST_EmptyStatement.prototype.shallow_cmp = pass_through;
133
134AST_LabeledStatement.prototype.shallow_cmp = mkshallow({ "label.name": "eq" });
135
136AST_Do.prototype.shallow_cmp = pass_through;
137
138AST_While.prototype.shallow_cmp = pass_through;
139
140AST_For.prototype.shallow_cmp = mkshallow({
141 init: "exist",
142 condition: "exist",
143 step: "exist"
144});
145
146AST_ForIn.prototype.shallow_cmp = pass_through;
147
148AST_ForOf.prototype.shallow_cmp = pass_through;
149
150AST_With.prototype.shallow_cmp = pass_through;
151
152AST_Toplevel.prototype.shallow_cmp = pass_through;
153
154AST_Expansion.prototype.shallow_cmp = pass_through;
155
156AST_Lambda.prototype.shallow_cmp = mkshallow({
157 is_generator: "eq",
158 async: "eq"
159});
160
161AST_Destructuring.prototype.shallow_cmp = mkshallow({
162 is_array: "eq"
163});
164
165AST_PrefixedTemplateString.prototype.shallow_cmp = pass_through;
166
167AST_TemplateString.prototype.shallow_cmp = pass_through;
168
169AST_TemplateSegment.prototype.shallow_cmp = mkshallow({
170 "value": "eq"
171});
172
173AST_Jump.prototype.shallow_cmp = pass_through;
174
175AST_LoopControl.prototype.shallow_cmp = pass_through;
176
177AST_Await.prototype.shallow_cmp = pass_through;
178
179AST_Yield.prototype.shallow_cmp = mkshallow({
180 is_star: "eq"
181});
182
183AST_If.prototype.shallow_cmp = mkshallow({
184 alternative: "exist"
185});
186
187AST_Switch.prototype.shallow_cmp = pass_through;
188
189AST_SwitchBranch.prototype.shallow_cmp = pass_through;
190
191AST_Try.prototype.shallow_cmp = mkshallow({
192 bcatch: "exist",
193 bfinally: "exist"
194});
195
196AST_Catch.prototype.shallow_cmp = mkshallow({
197 argname: "exist"
198});
199
200AST_Finally.prototype.shallow_cmp = pass_through;
201
202AST_Definitions.prototype.shallow_cmp = pass_through;
203
204AST_VarDef.prototype.shallow_cmp = mkshallow({
205 value: "exist"
206});
207
208AST_NameMapping.prototype.shallow_cmp = pass_through;
209
210AST_Import.prototype.shallow_cmp = mkshallow({
211 imported_name: "exist",
212 imported_names: "exist"
213});
214
215AST_ImportMeta.prototype.shallow_cmp = pass_through;
216
217AST_Export.prototype.shallow_cmp = mkshallow({
218 exported_definition: "exist",
219 exported_value: "exist",
220 exported_names: "exist",
221 module_name: "eq",
222 is_default: "eq",
223});
224
225AST_Call.prototype.shallow_cmp = pass_through;
226
227AST_Sequence.prototype.shallow_cmp = pass_through;
228
229AST_PropAccess.prototype.shallow_cmp = pass_through;
230
231AST_Chain.prototype.shallow_cmp = pass_through;
232
233AST_Dot.prototype.shallow_cmp = mkshallow({
234 property: "eq"
235});
236
237AST_DotHash.prototype.shallow_cmp = mkshallow({
238 property: "eq"
239});
240
241AST_Unary.prototype.shallow_cmp = mkshallow({
242 operator: "eq"
243});
244
245AST_Binary.prototype.shallow_cmp = mkshallow({
246 operator: "eq"
247});
248
249AST_Conditional.prototype.shallow_cmp = pass_through;
250
251AST_Array.prototype.shallow_cmp = pass_through;
252
253AST_Object.prototype.shallow_cmp = pass_through;
254
255AST_ObjectProperty.prototype.shallow_cmp = pass_through;
256
257AST_ObjectKeyVal.prototype.shallow_cmp = mkshallow({
258 key: "eq"
259});
260
261AST_ObjectSetter.prototype.shallow_cmp = mkshallow({
262 static: "eq"
263});
264
265AST_ObjectGetter.prototype.shallow_cmp = mkshallow({
266 static: "eq"
267});
268
269AST_ConciseMethod.prototype.shallow_cmp = mkshallow({
270 static: "eq",
271 is_generator: "eq",
272 async: "eq",
273});
274
275AST_Class.prototype.shallow_cmp = mkshallow({
276 name: "exist",
277 extends: "exist",
278});
279
280AST_ClassProperty.prototype.shallow_cmp = mkshallow({
281 static: "eq"
282});
283
284AST_Symbol.prototype.shallow_cmp = mkshallow({
285 name: "eq"
286});
287
288AST_NewTarget.prototype.shallow_cmp = pass_through;
289
290AST_This.prototype.shallow_cmp = pass_through;
291
292AST_Super.prototype.shallow_cmp = pass_through;
293
294AST_String.prototype.shallow_cmp = mkshallow({
295 value: "eq"
296});
297
298AST_Number.prototype.shallow_cmp = mkshallow({
299 value: "eq"
300});
301
302AST_BigInt.prototype.shallow_cmp = mkshallow({
303 value: "eq"
304});
305
306AST_RegExp.prototype.shallow_cmp = function (other) {
307 return (
308 this.value.flags === other.value.flags
309 && this.value.source === other.value.source
310 );
311};
312
313AST_Atom.prototype.shallow_cmp = pass_through;
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