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Emit [...a] as a.slice() to ensure a is copied

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This commit is contained in:
Anders Hejlsberg 2015-05-12 15:49:41 -07:00
parent 300cb8d9f2
commit c4b6e64ca6
1 changed files with 6 additions and 3 deletions
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9
src/compiler/emitter.ts
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@ -1366,7 +1366,7 @@ var __param = (this && this.__param) || function (paramIndex, decorator) {
return true;
}
function emitListWithSpread(elements: Expression[], multiLine: boolean, trailingComma: boolean) {
function emitListWithSpread(elements: Expression[], alwaysCopy: boolean, multiLine: boolean, trailingComma: boolean) {
let pos = 0;
let group = 0;
let length = elements.length;
@ -1383,6 +1383,9 @@ var __param = (this && this.__param) || function (paramIndex, decorator) {
e = (<SpreadElementExpression>e).expression;
emitParenthesizedIf(e, /*parenthesized*/ group === 0 && needsParenthesisForPropertyAccessOrInvocation(e));
pos++;
if (pos === length && group === 0 && alwaysCopy) {
write(".slice()");
}
}
else {
let i = pos;
@ -1422,7 +1425,7 @@ var __param = (this && this.__param) || function (paramIndex, decorator) {
write("]");
}
else {
emitListWithSpread(elements, /*multiLine*/(node.flags & NodeFlags.MultiLine) !== 0,
emitListWithSpread(elements, /*alwaysCopy*/ true, /*multiLine*/(node.flags & NodeFlags.MultiLine) !== 0,
/*trailingComma*/ elements.hasTrailingComma);
}
}
@ -1847,7 +1850,7 @@ var __param = (this && this.__param) || function (paramIndex, decorator) {
write("void 0");
}
write(", ");
emitListWithSpread(node.arguments, /*multiLine*/ false, /*trailingComma*/ false);
emitListWithSpread(node.arguments, /*alwaysCopy*/ false, /*multiLine*/ false, /*trailingComma*/ false);
write(")");
}