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 | 1
1
1
1
1
48
2
46
1
27
12
15
15
1
12
24
24
24
6
18
1
15
34
33
33
29
4
1
14
6
6
6
14
1
15
15
14
14
2
2
2
2
2
2
2
1
171
171
171
85
4
4
4
4
171
3
3
3
1
229
229
89
1
1
1
1
1
1
249
241
241
241
249
10
10
241
10
11
11
11
10
1
10
| var traverse = require("../traverse");
var util = require("../util");
var b = require("recast").types.builders;
var _ = require("lodash");
var buildVariableAssign = function (kind, id, init) {
if (kind === false) {
return b.expressionStatement(b.assignmentExpression("=", id, init));
} else {
return b.variableDeclaration(kind, [
b.variableDeclarator(id, init)
]);
}
};
var push = function (kind, nodes, pattern, parentId) {
if (pattern.type === "ObjectPattern") {
pushObjectPattern(kind, nodes, pattern, parentId);
} else Eif (pattern.type === "ArrayPattern") {
pushArrayPattern(kind, nodes, pattern, parentId);
}
};
var pushObjectPattern = function (kind, nodes, pattern, parentId) {
_.each(pattern.properties, function (prop) {
var pattern2 = prop.value;
var patternId2 = b.memberExpression(parentId, prop.key, false);
if (traverse.isPattern(pattern2)) {
push(kind, nodes, pattern2, patternId2);
} else {
nodes.push(buildVariableAssign(kind, pattern2, patternId2));
}
});
};
var pushArrayPattern = function (kind, nodes, pattern, parentId) {
_.each(pattern.elements, function (elem, i) {
if (!elem) return;
var newPatternId = b.memberExpression(parentId, b.literal(i), true);
if (elem.type === "Identifier") {
nodes.push(buildVariableAssign(kind, elem, newPatternId));
} else {
push(kind, nodes, elem, newPatternId);
}
});
};
var pushPattern = function (kind, nodes, pattern, parentId, file) {
if (parentId.type !== "MemberExpression" && parentId.type !== "Identifier") {
var key = b.identifier(file.generateUid("ref"));
nodes.push(b.variableDeclaration("var", [
b.variableDeclarator(key, parentId)
]));
parentId = key;
}
push(kind, nodes, pattern, parentId);
};
exports.ForInStatement =
exports.ForOfStatement = function (node, parent, file) {
var declar = node.left;
if (declar.type !== "VariableDeclaration") return;
var pattern = declar.declarations[0].id;
if (!traverse.isPattern(pattern)) return;
var key = b.identifier(file.generateUid("ref"));
node.left = b.variableDeclaration(declar.kind, [
b.variableDeclarator(key, null)
]);
var nodes = [];
push(declar.kind, nodes, pattern, key);
util.ensureBlock(node);
var block = node.body;
block.body = nodes.concat(block.body);
};
exports.Function = function (node, parent, file) {
var nodes = [];
var hasDestructuring = false;
node.params = node.params.map(function (pattern) {
if (!traverse.isPattern(pattern)) return pattern;
hasDestructuring = true;
var parentId = b.identifier(file.generateUid("ref"));
pushPattern("var", nodes, pattern, parentId, file);
return parentId;
});
if (!hasDestructuring) return;
util.ensureBlock(node);
var block = node.body;
block.body = nodes.concat(block.body);
};
exports.ExpressionStatement = function (node, parent, file) {
var expr = node.expression;
if (expr.type !== "AssignmentExpression") return;
if (!traverse.isPattern(expr.left)) return;
var nodes = [];
var ref = b.identifier(file.generateUid("ref"));
nodes.push(b.variableDeclaration("var", [
b.variableDeclarator(ref, expr.right)
]));
push(false, nodes, expr.left, ref);
return nodes;
};
exports.VariableDeclaration = function (node, parent, file) {
if (parent.type === "ForInStatement") return;
var nodes = [];
var hasPattern = false;
_.each(node.declarations, function (declar) {
if (traverse.isPattern(declar.id)) {
hasPattern = true;
return false;
}
});
if (!hasPattern) return;
_.each(node.declarations, function (declar) {
var patternId = declar.init;
var pattern = declar.id;
if (traverse.isPattern(pattern) && patternId) {
pushPattern(node.kind, nodes, pattern, patternId, file);
} else {
nodes.push(buildVariableAssign(node.kind, declar.id, declar.init));
}
});
return nodes;
};
|