angular2
Version:
Angular 2 - a web framework for modern web apps
65 lines • 9.66 kB
JavaScript
import { isPresent, isBlank } from 'angular2/src/facade/lang';
import { EmitterVisitorContext } from './abstract_emitter';
import { AbstractJsEmitterVisitor } from './abstract_js_emitter';
import { getImportModulePath, ImportEnv } from './path_util';
export class JavaScriptEmitter {
constructor() {
}
emitStatements(moduleUrl, stmts, exportedVars) {
var converter = new JsEmitterVisitor(moduleUrl);
var ctx = EmitterVisitorContext.createRoot(exportedVars);
converter.visitAllStatements(stmts, ctx);
var srcParts = [];
converter.importsWithPrefixes.forEach((prefix, importedModuleUrl) => {
// Note: can't write the real word for import as it screws up system.js auto detection...
srcParts.push(`var ${prefix} = req` +
`uire('${getImportModulePath(moduleUrl, importedModuleUrl, ImportEnv.JS)}');`);
});
srcParts.push(ctx.toSource());
return srcParts.join('\n');
}
}
class JsEmitterVisitor extends AbstractJsEmitterVisitor {
constructor(_moduleUrl) {
super();
this._moduleUrl = _moduleUrl;
this.importsWithPrefixes = new Map();
}
visitExternalExpr(ast, ctx) {
if (isPresent(ast.value.moduleUrl) && ast.value.moduleUrl != this._moduleUrl) {
var prefix = this.importsWithPrefixes.get(ast.value.moduleUrl);
if (isBlank(prefix)) {
prefix = `import${this.importsWithPrefixes.size}`;
this.importsWithPrefixes.set(ast.value.moduleUrl, prefix);
}
ctx.print(`${prefix}.`);
}
ctx.print(ast.value.name);
return null;
}
visitDeclareVarStmt(stmt, ctx) {
super.visitDeclareVarStmt(stmt, ctx);
if (ctx.isExportedVar(stmt.name)) {
ctx.println(exportVar(stmt.name));
}
return null;
}
visitDeclareFunctionStmt(stmt, ctx) {
super.visitDeclareFunctionStmt(stmt, ctx);
if (ctx.isExportedVar(stmt.name)) {
ctx.println(exportVar(stmt.name));
}
return null;
}
visitDeclareClassStmt(stmt, ctx) {
super.visitDeclareClassStmt(stmt, ctx);
if (ctx.isExportedVar(stmt.name)) {
ctx.println(exportVar(stmt.name));
}
return null;
}
}
function exportVar(varName) {
return `Object.defineProperty(exports, '${varName}', { get: function() { return ${varName}; }});`;
}
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