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[v] = a now compiles to v = a[0]

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satyr 2010-10-02 20:53:29 +09:00
parent f7e6dabf6b
commit a59d056ad2
2 changed files with 13 additions and 13 deletions
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13
lib/nodes.js
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@ -982,19 +982,20 @@
return top || this.parenthetical ? val : ("(" + (val) + ")");
};
AssignNode.prototype.compilePatternMatch = function(o) {
var _len, _ref2, accessClass, assigns, code, i, idx, isObject, obj, objects, oindex, olength, otop, splat, top, val, valVar, value;
var _len, _ref2, accessClass, assigns, code, i, idx, isObject, obj, objects, olength, otop, splat, top, val, valVar, value;
if ((value = this.value).isStatement(o)) {
value = ClosureNode.wrap(value);
}
objects = this.variable.base.objects;
if (!(objects.length)) {
if (!(olength = objects.length)) {
return value.compile(o);
}
if ((isObject = this.variable.isObject()) && objects.length === 1) {
if ((obj = objects[0]) instanceof AssignNode) {
isObject = this.variable.isObject();
if (olength === 1 && !((obj = objects[0]) instanceof SplatNode)) {
if (obj instanceof AssignNode) {
_ref2 = obj, idx = _ref2.variable.base, obj = _ref2.value;
} else {
idx = obj;
idx = isObject ? obj : literal(0);
}
if (!(value instanceof ValueNode)) {
value = new ValueNode(value);
@ -1025,7 +1026,7 @@
}
accessClass = isObject && IDENTIFIER.test(idx.value) ? AccessorNode : IndexNode;
if (!splat && obj instanceof SplatNode) {
val = literal(obj.compileValue(o, valVar, oindex = indexOf(objects, obj), (olength = objects.length) - oindex - 1));
val = literal(obj.compileValue(o, valVar, i, olength - i - 1));
splat = true;
} else {
if (typeof idx !== 'object') {

13
src/nodes.coffee
View file

@ -875,13 +875,14 @@ exports.AssignNode = class AssignNode extends BaseNode
compilePatternMatch: (o) ->
if (value = @value).isStatement o then value = ClosureNode.wrap value
{objects} = @variable.base
return value.compile o unless objects.length
if (isObject = @variable.isObject()) and objects.length is 1
return value.compile o unless olength = objects.length
isObject = @variable.isObject()
if olength is 1 and (obj = objects[0]) not instanceof SplatNode
# Unroll simplest cases: `{v} = x` -> `v = x.v`
if (obj = objects[0]) instanceof AssignNode
if obj instanceof AssignNode
{variable: {base: idx}, value: obj} = obj
else
idx = obj
idx = if isObject then obj else literal 0
value = new ValueNode value unless value instanceof ValueNode
accessClass = if IDENTIFIER.test idx.value then AccessorNode else IndexNode
value.properties.push new accessClass idx
@ -905,9 +906,7 @@ exports.AssignNode = class AssignNode extends BaseNode
throw new Error 'pattern matching must use only identifiers on the left-hand side.'
accessClass = if isObject and IDENTIFIER.test(idx.value) then AccessorNode else IndexNode
if not splat and obj instanceof SplatNode
val = literal obj.compileValue o, valVar,
(oindex = indexOf objects, obj),
(olength = objects.length) - oindex - 1
val = literal obj.compileValue o, valVar, i, olength - i - 1
splat = true
else
idx = literal(if splat then "#{valVar}.length - #{olength - idx}" else idx) if typeof idx isnt 'object'