@angular/compiler
Version:
Angular - the compiler library
74 lines • 10.2 kB
JavaScript
/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { EmitterVisitorContext } from './abstract_emitter';
import { AbstractJsEmitterVisitor } from './abstract_js_emitter';
import * as o from './output_ast';
export class JavaScriptEmitter {
emitStatements(genFilePath, stmts, preamble = '') {
const converter = new JsEmitterVisitor();
const ctx = EmitterVisitorContext.createRoot();
converter.visitAllStatements(stmts, ctx);
const preambleLines = preamble ? preamble.split('\n') : [];
converter.importsWithPrefixes.forEach((prefix, importedModuleName) => {
// Note: can't write the real word for import as it screws up system.js auto detection...
preambleLines.push(`var ${prefix} = req` +
`uire('${importedModuleName}');`);
});
const sm = ctx.toSourceMapGenerator(genFilePath, preambleLines.length).toJsComment();
const lines = [...preambleLines, ctx.toSource(), sm];
if (sm) {
// always add a newline at the end, as some tools have bugs without it.
lines.push('');
}
return lines.join('\n');
}
}
class JsEmitterVisitor extends AbstractJsEmitterVisitor {
constructor() {
super(...arguments);
this.importsWithPrefixes = new Map();
}
visitExternalExpr(ast, ctx) {
const { name, moduleName } = ast.value;
if (moduleName) {
let prefix = this.importsWithPrefixes.get(moduleName);
if (prefix == null) {
prefix = `i${this.importsWithPrefixes.size}`;
this.importsWithPrefixes.set(moduleName, prefix);
}
ctx.print(ast, `${prefix}.`);
}
ctx.print(ast, name);
return null;
}
visitDeclareVarStmt(stmt, ctx) {
super.visitDeclareVarStmt(stmt, ctx);
if (stmt.hasModifier(o.StmtModifier.Exported)) {
ctx.println(stmt, exportVar(stmt.name));
}
return null;
}
visitDeclareFunctionStmt(stmt, ctx) {
super.visitDeclareFunctionStmt(stmt, ctx);
if (stmt.hasModifier(o.StmtModifier.Exported)) {
ctx.println(stmt, exportVar(stmt.name));
}
return null;
}
visitDeclareClassStmt(stmt, ctx) {
super.visitDeclareClassStmt(stmt, ctx);
if (stmt.hasModifier(o.StmtModifier.Exported)) {
ctx.println(stmt, exportVar(stmt.name));
}
return null;
}
}
function exportVar(varName) {
return `Object.defineProperty(exports, '${varName}', { get: function() { return ${varName}; }});`;
}
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