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 | 1
401
401
1
1
1
1
1
1
1
1
1
1
401
401
401
401
401
401
401
401
401
1
16
53437
1
401
1
1
10
1
401
401
401
1
26552
26552
26152
26552
1838
1838
1838
26552
3252
26552
191
26552
147
26552
1
26553
26552
26552
26552
53104
43754
9350
9350
3306
1653
1653
6044
6044
6044
6044
9350
26552
26552
26552
26552
26552
26552
26552
26552
26552
26552
26552
26552
26552
1
5090
4321
4321
4321
4321
4321
8042
8042
446
8042
1120
4321
1
147
147
147
147
1
191
12
179
179
1
128
128
109
19
128
1
26552
1
26552
1
53104
3428
49676
49676
49676
49676
3428
49676
53104
49676
1
53104
1
53104
53104
53104
72
72
128
128
128
128
18
18
128
19
19
17
17
19
19
128
108
128
128
| 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,
semicolons: 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"),
classes: require("./generators/classes"),
methods: require("./generators/methods"),
modules: require("./generators/modules"),
types: require("./generators/types"),
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);
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);
}
self.newline(lines);
};
Eif (this[node.type]) {
this.printLeadingComments(node, parent);
newline(true);
Iif (opts.before) opts.before();
this.map.mark(node, "start");
// only compute if this node needs parens if our parent has been changed
// since acorn would've wrapped us in a ParanthesizedExpression
var needsParens = parent !== node._parent && n.needsParens(node, parent);
if (needsParens) this.push("(");
this[node.type](node, this.buildPrint(node), parent);
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 " + node.type + " " + JSON.stringify(node));
}
};
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) {
// 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));
});
};
|