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Add the context mutation operators.

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This commit is contained in:
Cyrus Najmabadi 2014-11-24 21:04:46 -08:00
parent 8a615669e5
commit 726de4b402
1 changed files with 58 additions and 0 deletions
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58
src/compiler/parser.ts
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@ -919,6 +919,16 @@ module ts {
updateContextFlags();
}
function setYieldContext(val: boolean) {
yieldContext = val;
updateContextFlags();
}
function setGeneratorParameterContext(val: boolean) {
generatorParameterContext = val;
updateContextFlags();
}
function allowInAnd<T>(func: () => T): T {
if (disallowInContext) {
setDisallowInContext(false);
@ -943,6 +953,54 @@ module ts {
return result;
}
function enterYieldContextAnd<T>(func: () => T): T {
if (yieldContext) {
// no need to do anything special if we're already in the [Yield] context.
return func();
}
setYieldContext(true);
var result = func();
setYieldContext(false);
return result;
}
function exitYieldContextAnd<T>(func: () => T): T {
if (yieldContext) {
setYieldContext(false);
var result = func();
setYieldContext(true);
return result;
}
// no need to do anything special if we're not in the [Yield] context.
return func();
}
function enterGeneratorParameterContextAnd<T>(func: () => T): T {
if (generatorParameterContext) {
// no need to do anything special if we're already in the [GeneratorParameter] context
return func();
}
setGeneratorParameterContext(true);
var result = func();
setGeneratorParameterContext(false);
return result;
}
function exitGeneratorParameterContextAnd<T>(func: () => T): T {
if (generatorParameterContext) {
setGeneratorParameterContext(false);
var result = func();
setGeneratorParameterContext(true);
return result;
}
// no need to do anything special if we're not in the [GeneratorParameter] context
return func();
}
function getLineStarts(): number[] {
return lineStarts || (lineStarts = computeLineStarts(sourceText));
}