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Merge pull request #10240 from Microsoft/optimizeTypeListIds

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Optimize format of type list id strings used in maps
This commit is contained in:
Anders Hejlsberg
2016-08-11 10:11:41 -07:00
committed by GitHub
parent e900952d3d 9d4547c5d0
commit e00ce94b94
1 changed files with 18 additions and 15 deletions
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33
src/compiler/checker.ts
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@@ -4948,24 +4948,27 @@ namespace ts {
}
function getTypeListId(types: Type[]) {
let result = "";
if (types) {
switch (types.length) {
case 1:
return "" + types[0].id;
case 2:
return types[0].id + "," + types[1].id;
default:
let result = "";
for (let i = 0; i < types.length; i++) {
if (i > 0) {
result += ",";
}
result += types[i].id;
}
return result;
const length = types.length;
let i = 0;
while (i < length) {
const startId = types[i].id;
let count = 1;
while (i + count < length && types[i + count].id === startId + count) {
count++;
}
if (result.length) {
result += ",";
}
result += startId;
if (count > 1) {
result += ":" + count;
}
i += count;
}
}
return "";
return result;
}
// This function is used to propagate certain flags when creating new object type references and union types.