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extract emitExportStar in separate function

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This commit is contained in:
Vladimir Matveev
2015-04-28 20:17:55 -07:00
parent 3af5592243
commit 5f18d9b912
5 changed files with 84 additions and 58 deletions
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59
src/compiler/emitter.ts
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@@ -4968,7 +4968,6 @@ if (typeof __param !== "function") __param = function (paramIndex, decorator) {
// should always win over entries with similar names that were added via star exports
// to support this we store names of local/indirect exported entries in a set.
// this set is used to filter names brought by star expors.
if (!hasExportStars) {
// local names set is needed only in presence of star exports
return undefined;
@@ -4987,19 +4986,11 @@ if (typeof __param !== "function") __param = function (paramIndex, decorator) {
}
if (!hasExportDeclarationWithExportClause) {
// nothing is exported
return undefined;
// we still need to emit exportStar helper
return emitExportStarFunction(/*localNames*/ undefined);
}
}
// storage has the following structure
// {
// <exported-name-from-current-module> : void 0,
// <exported-name-obtained-from star export in module 'm'>: 'm'
// }
// this allows to:
// - prevent star exports to overwrite locally exported names
// - bind star exported names to particular module so they won't be overwritten by other star exports
const exportedNamesStorageRef = makeUniqueName("exportedNames");
writeLine();
@@ -5044,27 +5035,31 @@ if (typeof __param !== "function") __param = function (paramIndex, decorator) {
writeLine();
write("};");
writeLine();
const exportStarFunction = makeUniqueName("exportStar");
return emitExportStarFunction(exportedNamesStorageRef);
// define an export star helper function
write(`function ${exportStarFunction}(m, name) {`);
writeLine();
write(` for(var n in m) {`);
writeLine();
// if name is not yet taken by either local names or names in other modules - reserve it
write(` if (!${exportedNamesStorageRef}.hasOwnProperty(n)) ${exportedNamesStorageRef}[n] = name;`);
writeLine();
// only export value if it was exported from the module with name 'name';
write(` if (${exportedNamesStorageRef}[n] === name) ${exportFunctionForFile}(n, m[n]);`);
writeLine();
write(" }");
writeLine();
write("}")
function emitExportStarFunction(localNames: string): string {
const exportStarFunction = makeUniqueName("exportStar");
return exportStarFunction;
writeLine();
// define an export star helper function
write(`function ${exportStarFunction}(m) {`);
writeLine();
write(` for(var n in m) {`);
writeLine();
write(` `);
if (localNames) {
write(`if (!${localNames}.hasOwnProperty(n)) `);
}
write(`${exportFunctionForFile}(n, m[n]);`);
writeLine();
write(" }");
writeLine();
write("}")
return exportStarFunction;
}
function writeExportedName(node: Identifier | Declaration): void {
if (started) {
write(",");
@@ -5085,7 +5080,7 @@ if (typeof __param !== "function") __param = function (paramIndex, decorator) {
emitDeclarationName(<Declaration>node);
}
write("': void 0");
write("': true");
}
}
@@ -5368,8 +5363,8 @@ if (typeof __param !== "function") __param = function (paramIndex, decorator) {
writeLine();
// export * from 'foo'
// emit as:
// exportStar(_foo, 'foo');
write(`${exportStarFunction}(${parameterName}, ${getExternalModuleNameText(importNode)});`);
// exportStar(_foo);
write(`${exportStarFunction}(${parameterName});`);
}
writeLine();