angular2
Version:
Angular 2 - a web framework for modern web apps
155 lines • 21.3 kB
JavaScript
import { isPresent } from 'angular2/src/facade/lang';
import { BaseException } from 'angular2/src/facade/exceptions';
import * as o from './output_ast';
import { AbstractEmitterVisitor, CATCH_ERROR_VAR, CATCH_STACK_VAR } from './abstract_emitter';
export class AbstractJsEmitterVisitor extends AbstractEmitterVisitor {
constructor() {
super(false);
}
visitDeclareClassStmt(stmt, ctx) {
ctx.pushClass(stmt);
this._visitClassConstructor(stmt, ctx);
if (isPresent(stmt.parent)) {
ctx.print(`${stmt.name}.prototype = Object.create(`);
stmt.parent.visitExpression(this, ctx);
ctx.println(`.prototype);`);
}
stmt.getters.forEach((getter) => this._visitClassGetter(stmt, getter, ctx));
stmt.methods.forEach((method) => this._visitClassMethod(stmt, method, ctx));
ctx.popClass();
return null;
}
_visitClassConstructor(stmt, ctx) {
ctx.print(`function ${stmt.name}(`);
if (isPresent(stmt.constructorMethod)) {
this._visitParams(stmt.constructorMethod.params, ctx);
}
ctx.println(`) {`);
ctx.incIndent();
if (isPresent(stmt.constructorMethod)) {
if (stmt.constructorMethod.body.length > 0) {
ctx.println(`var self = this;`);
this.visitAllStatements(stmt.constructorMethod.body, ctx);
}
}
ctx.decIndent();
ctx.println(`}`);
}
_visitClassGetter(stmt, getter, ctx) {
ctx.println(`Object.defineProperty(${stmt.name}.prototype, '${getter.name}', { get: function() {`);
ctx.incIndent();
if (getter.body.length > 0) {
ctx.println(`var self = this;`);
this.visitAllStatements(getter.body, ctx);
}
ctx.decIndent();
ctx.println(`}});`);
}
_visitClassMethod(stmt, method, ctx) {
ctx.print(`${stmt.name}.prototype.${method.name} = function(`);
this._visitParams(method.params, ctx);
ctx.println(`) {`);
ctx.incIndent();
if (method.body.length > 0) {
ctx.println(`var self = this;`);
this.visitAllStatements(method.body, ctx);
}
ctx.decIndent();
ctx.println(`};`);
}
visitReadVarExpr(ast, ctx) {
if (ast.builtin === o.BuiltinVar.This) {
ctx.print('self');
}
else if (ast.builtin === o.BuiltinVar.Super) {
throw new BaseException(`'super' needs to be handled at a parent ast node, not at the variable level!`);
}
else {
super.visitReadVarExpr(ast, ctx);
}
return null;
}
visitDeclareVarStmt(stmt, ctx) {
ctx.print(`var ${stmt.name} = `);
stmt.value.visitExpression(this, ctx);
ctx.println(`;`);
return null;
}
visitCastExpr(ast, ctx) {
ast.value.visitExpression(this, ctx);
return null;
}
visitInvokeFunctionExpr(expr, ctx) {
var fnExpr = expr.fn;
if (fnExpr instanceof o.ReadVarExpr && fnExpr.builtin === o.BuiltinVar.Super) {
ctx.currentClass.parent.visitExpression(this, ctx);
ctx.print(`.call(this`);
if (expr.args.length > 0) {
ctx.print(`, `);
this.visitAllExpressions(expr.args, ctx, ',');
}
ctx.print(`)`);
}
else {
super.visitInvokeFunctionExpr(expr, ctx);
}
return null;
}
visitFunctionExpr(ast, ctx) {
ctx.print(`function(`);
this._visitParams(ast.params, ctx);
ctx.println(`) {`);
ctx.incIndent();
this.visitAllStatements(ast.statements, ctx);
ctx.decIndent();
ctx.print(`}`);
return null;
}
visitDeclareFunctionStmt(stmt, ctx) {
ctx.print(`function ${stmt.name}(`);
this._visitParams(stmt.params, ctx);
ctx.println(`) {`);
ctx.incIndent();
this.visitAllStatements(stmt.statements, ctx);
ctx.decIndent();
ctx.println(`}`);
return null;
}
visitTryCatchStmt(stmt, ctx) {
ctx.println(`try {`);
ctx.incIndent();
this.visitAllStatements(stmt.bodyStmts, ctx);
ctx.decIndent();
ctx.println(`} catch (${CATCH_ERROR_VAR.name}) {`);
ctx.incIndent();
var catchStmts = [
CATCH_STACK_VAR.set(CATCH_ERROR_VAR.prop('stack'))
.toDeclStmt(null, [o.StmtModifier.Final])
].concat(stmt.catchStmts);
this.visitAllStatements(catchStmts, ctx);
ctx.decIndent();
ctx.println(`}`);
return null;
}
_visitParams(params, ctx) {
this.visitAllObjects((param) => ctx.print(param.name), params, ctx, ',');
}
getBuiltinMethodName(method) {
var name;
switch (method) {
case o.BuiltinMethod.ConcatArray:
name = 'concat';
break;
case o.BuiltinMethod.SubscribeObservable:
name = 'subscribe';
break;
case o.BuiltinMethod.bind:
name = 'bind';
break;
default:
throw new BaseException(`Unknown builtin method: ${method}`);
}
return name;
}
}
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{isPresent} from 'angular2/src/facade/lang';\nimport {BaseException} from 'angular2/src/facade/exceptions';\nimport * as o from './output_ast';\nimport {\n  EmitterVisitorContext,\n  AbstractEmitterVisitor,\n  CATCH_ERROR_VAR,\n  CATCH_STACK_VAR\n} from './abstract_emitter';\n\nexport abstract class AbstractJsEmitterVisitor extends AbstractEmitterVisitor {\n  constructor() { super(false); }\n  visitDeclareClassStmt(stmt: o.ClassStmt, ctx: EmitterVisitorContext): any {\n    ctx.pushClass(stmt);\n    this._visitClassConstructor(stmt, ctx);\n\n    if (isPresent(stmt.parent)) {\n      ctx.print(`${stmt.name}.prototype = Object.create(`);\n      stmt.parent.visitExpression(this, ctx);\n      ctx.println(`.prototype);`);\n    }\n    stmt.getters.forEach((getter) => this._visitClassGetter(stmt, getter, ctx));\n    stmt.methods.forEach((method) => this._visitClassMethod(stmt, method, ctx));\n    ctx.popClass();\n    return null;\n  }\n\n  private _visitClassConstructor(stmt: o.ClassStmt, ctx: EmitterVisitorContext) {\n    ctx.print(`function ${stmt.name}(`);\n    if (isPresent(stmt.constructorMethod)) {\n      this._visitParams(stmt.constructorMethod.params, ctx);\n    }\n    ctx.println(`) {`);\n    ctx.incIndent();\n    if (isPresent(stmt.constructorMethod)) {\n      if (stmt.constructorMethod.body.length > 0) {\n        ctx.println(`var self = this;`);\n        this.visitAllStatements(stmt.constructorMethod.body, ctx);\n      }\n    }\n    ctx.decIndent();\n    ctx.println(`}`);\n  }\n\n  private _visitClassGetter(stmt: o.ClassStmt, getter: o.ClassGetter, ctx: EmitterVisitorContext) {\n    ctx.println(\n        `Object.defineProperty(${stmt.name}.prototype, '${getter.name}', { get: function() {`);\n    ctx.incIndent();\n    if (getter.body.length > 0) {\n      ctx.println(`var self = this;`);\n      this.visitAllStatements(getter.body, ctx);\n    }\n    ctx.decIndent();\n    ctx.println(`}});`);\n  }\n\n  private _visitClassMethod(stmt: o.ClassStmt, method: o.ClassMethod, ctx: EmitterVisitorContext) {\n    ctx.print(`${stmt.name}.prototype.${method.name} = function(`);\n    this._visitParams(method.params, ctx);\n    ctx.println(`) {`);\n    ctx.incIndent();\n    if (method.body.length > 0) {\n      ctx.println(`var self = this;`);\n      this.visitAllStatements(method.body, ctx);\n    }\n    ctx.decIndent();\n    ctx.println(`};`);\n  }\n\n  visitReadVarExpr(ast: o.ReadVarExpr, ctx: EmitterVisitorContext): string {\n    if (ast.builtin === o.BuiltinVar.This) {\n      ctx.print('self');\n    } else if (ast.builtin === o.BuiltinVar.Super) {\n      throw new BaseException(\n          `'super' needs to be handled at a parent ast node, not at the variable level!`);\n    } else {\n      super.visitReadVarExpr(ast, ctx);\n    }\n    return null;\n  }\n  visitDeclareVarStmt(stmt: o.DeclareVarStmt, ctx: EmitterVisitorContext): any {\n    ctx.print(`var ${stmt.name} = `);\n    stmt.value.visitExpression(this, ctx);\n    ctx.println(`;`);\n    return null;\n  }\n  visitCastExpr(ast: o.CastExpr, ctx: EmitterVisitorContext): any {\n    ast.value.visitExpression(this, ctx);\n    return null;\n  }\n  visitInvokeFunctionExpr(expr: o.InvokeFunctionExpr, ctx: EmitterVisitorContext): string {\n    var fnExpr = expr.fn;\n    if (fnExpr instanceof o.ReadVarExpr && fnExpr.builtin === o.BuiltinVar.Super) {\n      ctx.currentClass.parent.visitExpression(this, ctx);\n      ctx.print(`.call(this`);\n      if (expr.args.length > 0) {\n        ctx.print(`, `);\n        this.visitAllExpressions(expr.args, ctx, ',');\n      }\n      ctx.print(`)`);\n    } else {\n      super.visitInvokeFunctionExpr(expr, ctx);\n    }\n    return null;\n  }\n  visitFunctionExpr(ast: o.FunctionExpr, ctx: EmitterVisitorContext): any {\n    ctx.print(`function(`);\n    this._visitParams(ast.params, ctx);\n    ctx.println(`) {`);\n    ctx.incIndent();\n    this.visitAllStatements(ast.statements, ctx);\n    ctx.decIndent();\n    ctx.print(`}`);\n    return null;\n  }\n  visitDeclareFunctionStmt(stmt: o.DeclareFunctionStmt, ctx: EmitterVisitorContext): any {\n    ctx.print(`function ${stmt.name}(`);\n    this._visitParams(stmt.params, ctx);\n    ctx.println(`) {`);\n    ctx.incIndent();\n    this.visitAllStatements(stmt.statements, ctx);\n    ctx.decIndent();\n    ctx.println(`}`);\n    return null;\n  }\n  visitTryCatchStmt(stmt: o.TryCatchStmt, ctx: EmitterVisitorContext): any {\n    ctx.println(`try {`);\n    ctx.incIndent();\n    this.visitAllStatements(stmt.bodyStmts, ctx);\n    ctx.decIndent();\n    ctx.println(`} catch (${CATCH_ERROR_VAR.name}) {`);\n    ctx.incIndent();\n    var catchStmts = [\n      <o.Statement>CATCH_STACK_VAR.set(CATCH_ERROR_VAR.prop('stack'))\n          .toDeclStmt(null, [o.StmtModifier.Final])\n    ].concat(stmt.catchStmts);\n    this.visitAllStatements(catchStmts, ctx);\n    ctx.decIndent();\n    ctx.println(`}`);\n    return null;\n  }\n\n  private _visitParams(params: o.FnParam[], ctx: EmitterVisitorContext): void {\n    this.visitAllObjects((param) => ctx.print(param.name), params, ctx, ',');\n  }\n\n  getBuiltinMethodName(method: o.BuiltinMethod): string {\n    var name;\n    switch (method) {\n      case o.BuiltinMethod.ConcatArray:\n        name = 'concat';\n        break;\n      case o.BuiltinMethod.SubscribeObservable:\n        name = 'subscribe';\n        break;\n      case o.BuiltinMethod.bind:\n        name = 'bind';\n        break;\n      default:\n        throw new BaseException(`Unknown builtin method: ${method}`);\n    }\n    return name;\n  }\n}\n"]}