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Emit for...of when LHS is expression

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This commit is contained in:
Jason Freeman
2015-03-03 14:45:16 -08:00
parent 9b76a0298b
commit f915efa6d7
13 changed files with 120 additions and 9 deletions
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26
src/compiler/emitter.ts
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@@ -3491,10 +3491,10 @@ module ts {
var endPos = emitToken(SyntaxKind.ForKeyword, node.pos);
write(" ");
endPos = emitToken(SyntaxKind.OpenParenToken, endPos);
write("var ");
if (node.initializer.kind === SyntaxKind.VariableDeclarationList) {
var variableDeclarationList = <VariableDeclarationList>node.initializer;
if (variableDeclarationList.declarations.length >= 1) {
write("var ");
var decl = variableDeclarationList.declarations[0];
// TODO handle binding patterns
emit(decl.name);
@@ -3537,13 +3537,25 @@ module ts {
// v = _a[_i];
if (decl) {
emit(decl.name);
write(" = ");
emit(rhsReference)
write("[");
emit(counter);
write("];");
writeLine();
}
else if (variableDeclarationList) {
// It's an empty declaration list. This can only happen in an error case, if the user wrote
// for (var of []) {}
var emptyDeclarationListTemp = createTempVariable(node, /*forLoopVariable*/ false);
write("var ");
emit(emptyDeclarationListTemp);
}
else {
// Initializer is an expression. Emit the expression in the body, so that it's
// evaluated on every iteration.
emit(node.initializer);
}
write(" = ");
emit(rhsReference)
write("[");
emit(counter);
write("];");
writeLine();
if (node.statement.kind === SyntaxKind.Block) {
emitLines((<Block>node.statement).statements);