1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328 | 1
12210
12210
1
1
1
1
1
1
1
1
1
1
12210
12210
12210
12210
12210
12210
12210
12210
12210
1
16
2269642
1
12210
1
1
12
1
12210
12210
12210
12210
75671
12210
12210
1
996813
996813
985192
996813
65142
65142
65142
996813
117514
996813
2955
996813
31313
996813
1
997402
996813
996813
996813
1993626
1677746
315880
315880
309518
154759
154759
6362
6362
6362
6362
6362
315880
996813
996813
996813
996813
996813
996813
996813
996813
996813
996813
996813
996813
996813
996813
996813
996813
1
182656
164469
164469
164469
164469
164469
276353
276353
7468
276353
33788
164469
1
31313
31313
31313
31313
1
2955
15
2940
2940
1
75671
75671
63770
11901
75671
1
996813
1
996813
1
1993626
126604
1867022
1867022
1867022
1867022
126604
1867022
1993626
1867022
1
1993626
1
2005836
2005836
2005836
25240
25240
75671
75671
349845
75671
75671
75671
75671
75671
75671
75671
75671
224
224
75671
11901
11901
112
112
11901
11901
75671
75326
75671
75671
| module.exports = function (ast, opts, code) {
var gen = new CodeGenerator(ast, opts, code);
return gen.generate();
};
module.exports.CodeGenerator = CodeGenerator;
var Whitespace = require("./whitespace");
var SourceMap = require("./source-map");
var Position = require("./position");
var Buffer = require("./buffer");
var util = require("../util");
var n = require("./node");
var t = require("../types");
var _ = require("lodash");
function CodeGenerator(ast, opts, code) {
opts = opts || {};
this.comments = ast.comments || [];
this.tokens = ast.tokens || [];
this.format = CodeGenerator.normaliseOptions(opts);
this.ast = ast;
this.whitespace = new Whitespace(this.tokens, this.comments);
this.position = new Position;
this.map = new SourceMap(this.position, opts, code);
this.buffer = new Buffer(this.position, this.format);
}
_.each(Buffer.prototype, function (fn, key) {
CodeGenerator.prototype[key] = function () {
return fn.apply(this.buffer, arguments);
};
});
CodeGenerator.normaliseOptions = function (opts) {
return _.merge({
parentheses: true,
comments: opts.comments == null || opts.comments,
compact: false,
indent: {
adjustMultilineComment: true,
style: " ",
base: 0
}
}, opts.format || {});
};
CodeGenerator.generators = {
templateLiterals: require("./generators/template-literals"),
comprehensions: require("./generators/comprehensions"),
expressions: require("./generators/expressions"),
statements: require("./generators/statements"),
playground: require("./generators/playground"),
classes: require("./generators/classes"),
methods: require("./generators/methods"),
modules: require("./generators/modules"),
types: require("./generators/types"),
flow: require("./generators/flow"),
base: require("./generators/base"),
jsx: require("./generators/jsx")
};
_.each(CodeGenerator.generators, function (generator) {
_.extend(CodeGenerator.prototype, generator);
});
CodeGenerator.prototype.generate = function () {
var ast = this.ast;
this.print(ast);
var comments = [];
_.each(ast.comments, function (comment) {
if (!comment._displayed) comments.push(comment);
});
this._printComments(comments);
return {
map: this.map.get(),
code: this.buffer.get()
};
};
CodeGenerator.prototype.buildPrint = function (parent) {
var self = this;
var print = function (node, opts) {
return self.print(node, parent, opts);
};
print.sequence = function (nodes, opts) {
opts = opts || {};
opts.statement = true;
return self.printJoin(print, nodes, opts);
};
print.join = function (nodes, opts) {
return self.printJoin(print, nodes, opts);
};
print.block = function (node) {
return self.printBlock(print, node);
};
print.indentOnComments = function (node) {
return self.printAndIndentOnComments(print, node);
};
return print;
};
CodeGenerator.prototype.print = function (node, parent, opts) {
if (!node) return "";
var self = this;
opts = opts || {};
var newline = function (leading) {
if (!opts.statement && !n.isUserWhitespacable(node, parent)) {
return;
}
var lines = 0;
if (node.start != null) {
// user node
if (leading) {
lines = self.whitespace.getNewlinesBefore(node);
} else {
lines = self.whitespace.getNewlinesAfter(node);
}
} else {
// generated node
if (!leading) lines++; // always include at least a single line after
var needs = n.needsWhitespaceAfter;
if (leading) needs = n.needsWhitespaceBefore;
lines += needs(node, parent);
// generated nodes can't add starting file whitespace
if (!self.buffer.get()) lines = 0;
}
self.newline(lines);
};
Eif (this[node.type]) {
var needsNoLineTermParens = n.needsParensNoLineTerminator(node, parent);
var needsParens = needsNoLineTermParens || n.needsParens(node, parent);
if (needsParens) this.push("(");
Iif (needsNoLineTermParens) this.indent();
this.printLeadingComments(node, parent);
newline(true);
Iif (opts.before) opts.before();
this.map.mark(node, "start");
this[node.type](node, this.buildPrint(node), parent);
Iif (needsNoLineTermParens) {
this.newline();
this.dedent();
}
if (needsParens) this.push(")");
this.map.mark(node, "end");
if (opts.after) opts.after();
newline(false);
this.printTrailingComments(node, parent);
} else {
throw new ReferenceError("unknown node of type " + JSON.stringify(node.type) + " with constructor " + JSON.stringify(node && node.constructor.name));
}
};
CodeGenerator.prototype.printJoin = function (print, nodes, opts) {
if (!nodes || !nodes.length) return;
opts = opts || {};
var self = this;
var len = nodes.length;
if (opts.indent) self.indent();
_.each(nodes, function (node, i) {
print(node, {
statement: opts.statement,
after: function () {
if (opts.iterator) {
opts.iterator(node, i);
}
if (opts.separator && i < len - 1) {
self.push(opts.separator);
}
}
});
});
if (opts.indent) self.dedent();
};
CodeGenerator.prototype.printAndIndentOnComments = function (print, node) {
var indent = !!node.leadingComments;
if (indent) this.indent();
print(node);
if (indent) this.dedent();
};
CodeGenerator.prototype.printBlock = function (print, node) {
if (t.isEmptyStatement(node)) {
this.semicolon();
} else {
this.push(" ");
print(node);
}
};
CodeGenerator.prototype.generateComment = function (comment) {
var val = comment.value;
if (comment.type === "Line") {
val = "//" + val;
} else {
val = "/*" + val + "*/";
}
return val;
};
CodeGenerator.prototype.printTrailingComments = function (node, parent) {
this._printComments(this.getComments("trailingComments", node, parent));
};
CodeGenerator.prototype.printLeadingComments = function (node, parent) {
this._printComments(this.getComments("leadingComments", node, parent));
};
CodeGenerator.prototype.getComments = function (key, node, parent) {
if (t.isExpressionStatement(parent)) {
return [];
}
var comments = [];
var nodes = [node];
var self = this;
if (t.isExpressionStatement(node)) {
nodes.push(node.argument);
}
_.each(nodes, function (node) {
comments = comments.concat(self._getComments(key, node));
});
return comments;
};
CodeGenerator.prototype._getComments = function (key, node) {
return (node && node[key]) || [];
};
CodeGenerator.prototype._printComments = function (comments) {
Iif (this.format.compact) return;
Iif (!this.format.comments) return;
if (!comments || !comments.length) return;
var self = this;
_.each(comments, function (comment) {
var skip = false;
// find the original comment in the ast and set it as displayed
_.each(self.ast.comments, function (origComment) {
if (origComment.start === comment.start) {
// comment has already been output
Iif (origComment._displayed) skip = true;
origComment._displayed = true;
return false;
}
});
Iif (skip) return;
// whitespace before
self.newline(self.whitespace.getNewlinesBefore(comment));
var column = self.position.column;
var val = self.generateComment(comment);
if (column && !self.isLast(["\n", " ", "[", "{"])) {
self._push(" ");
column++;
}
//
if (comment.type === "Block" && self.format.indent.adjustMultilineComment) {
var offset = comment.loc.start.column;
if (offset) {
var newlineRegex = new RegExp("\\n\\s{1," + offset + "}", "g");
val = val.replace(newlineRegex, "\n");
}
var indent = Math.max(self.indentSize(), column);
val = val.replace(/\n/g, "\n" + util.repeat(indent));
}
if (column === 0) {
val = self.getIndent() + val;
}
//
self._push(val);
// whitespace after
self.newline(self.whitespace.getNewlinesAfter(comment));
});
};
|