@angular/compiler
Version:
Angular - the compiler library
222 lines • 31.4 kB
JavaScript
/**
* @license
* Copyright Google LLC 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 { AbstractEmitterVisitor, CATCH_ERROR_VAR, CATCH_STACK_VAR, escapeIdentifier } from './abstract_emitter';
import * as o from './output_ast';
/**
* In TypeScript, tagged template functions expect a "template object", which is an array of
* "cooked" strings plus a `raw` property that contains an array of "raw" strings. This is
* typically constructed with a function called `__makeTemplateObject(cooked, raw)`, but it may not
* be available in all environments.
*
* This is a JavaScript polyfill that uses __makeTemplateObject when it's available, but otherwise
* creates an inline helper with the same functionality.
*
* In the inline function, if `Object.defineProperty` is available we use that to attach the `raw`
* array.
*/
const makeTemplateObjectPolyfill = '(this&&this.__makeTemplateObject||function(e,t){return Object.defineProperty?Object.defineProperty(e,"raw",{value:t}):e.raw=t,e})';
export class AbstractJsEmitterVisitor extends AbstractEmitterVisitor {
constructor() {
super(false);
}
visitDeclareClassStmt(stmt, ctx) {
ctx.pushClass(stmt);
this._visitClassConstructor(stmt, ctx);
if (stmt.parent != null) {
ctx.print(stmt, `${stmt.name}.prototype = Object.create(`);
stmt.parent.visitExpression(this, ctx);
ctx.println(stmt, `.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(stmt, `function ${stmt.name}(`);
if (stmt.constructorMethod != null) {
this._visitParams(stmt.constructorMethod.params, ctx);
}
ctx.println(stmt, `) {`);
ctx.incIndent();
if (stmt.constructorMethod != null) {
if (stmt.constructorMethod.body.length > 0) {
ctx.println(stmt, `var self = this;`);
this.visitAllStatements(stmt.constructorMethod.body, ctx);
}
}
ctx.decIndent();
ctx.println(stmt, `}`);
}
_visitClassGetter(stmt, getter, ctx) {
ctx.println(stmt, `Object.defineProperty(${stmt.name}.prototype, '${getter.name}', { get: function() {`);
ctx.incIndent();
if (getter.body.length > 0) {
ctx.println(stmt, `var self = this;`);
this.visitAllStatements(getter.body, ctx);
}
ctx.decIndent();
ctx.println(stmt, `}});`);
}
_visitClassMethod(stmt, method, ctx) {
ctx.print(stmt, `${stmt.name}.prototype.${method.name} = function(`);
this._visitParams(method.params, ctx);
ctx.println(stmt, `) {`);
ctx.incIndent();
if (method.body.length > 0) {
ctx.println(stmt, `var self = this;`);
this.visitAllStatements(method.body, ctx);
}
ctx.decIndent();
ctx.println(stmt, `};`);
}
visitWrappedNodeExpr(ast, ctx) {
throw new Error('Cannot emit a WrappedNodeExpr in Javascript.');
}
visitReadVarExpr(ast, ctx) {
if (ast.builtin === o.BuiltinVar.This) {
ctx.print(ast, 'self');
}
else if (ast.builtin === o.BuiltinVar.Super) {
throw new Error(`'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(stmt, `var ${stmt.name}`);
if (stmt.value) {
ctx.print(stmt, ' = ');
stmt.value.visitExpression(this, ctx);
}
ctx.println(stmt, `;`);
return null;
}
visitCastExpr(ast, ctx) {
ast.value.visitExpression(this, ctx);
return null;
}
visitInvokeFunctionExpr(expr, ctx) {
const fnExpr = expr.fn;
if (fnExpr instanceof o.ReadVarExpr && fnExpr.builtin === o.BuiltinVar.Super) {
ctx.currentClass.parent.visitExpression(this, ctx);
ctx.print(expr, `.call(this`);
if (expr.args.length > 0) {
ctx.print(expr, `, `);
this.visitAllExpressions(expr.args, ctx, ',');
}
ctx.print(expr, `)`);
}
else {
super.visitInvokeFunctionExpr(expr, ctx);
}
return null;
}
visitTaggedTemplateExpr(ast, ctx) {
// The following convoluted piece of code is effectively the downlevelled equivalent of
// ```
// tag`...`
// ```
// which is effectively like:
// ```
// tag(__makeTemplateObject(cooked, raw), expression1, expression2, ...);
// ```
const elements = ast.template.elements;
ast.tag.visitExpression(this, ctx);
ctx.print(ast, `(${makeTemplateObjectPolyfill}(`);
ctx.print(ast, `[${elements.map(part => escapeIdentifier(part.text, false)).join(', ')}], `);
ctx.print(ast, `[${elements.map(part => escapeIdentifier(part.rawText, false)).join(', ')}])`);
ast.template.expressions.forEach(expression => {
ctx.print(ast, ', ');
expression.visitExpression(this, ctx);
});
ctx.print(ast, ')');
return null;
}
visitFunctionExpr(ast, ctx) {
ctx.print(ast, `function${ast.name ? ' ' + ast.name : ''}(`);
this._visitParams(ast.params, ctx);
ctx.println(ast, `) {`);
ctx.incIndent();
this.visitAllStatements(ast.statements, ctx);
ctx.decIndent();
ctx.print(ast, `}`);
return null;
}
visitDeclareFunctionStmt(stmt, ctx) {
ctx.print(stmt, `function ${stmt.name}(`);
this._visitParams(stmt.params, ctx);
ctx.println(stmt, `) {`);
ctx.incIndent();
this.visitAllStatements(stmt.statements, ctx);
ctx.decIndent();
ctx.println(stmt, `}`);
return null;
}
visitTryCatchStmt(stmt, ctx) {
ctx.println(stmt, `try {`);
ctx.incIndent();
this.visitAllStatements(stmt.bodyStmts, ctx);
ctx.decIndent();
ctx.println(stmt, `} catch (${CATCH_ERROR_VAR.name}) {`);
ctx.incIndent();
const 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(stmt, `}`);
return null;
}
visitLocalizedString(ast, ctx) {
// The following convoluted piece of code is effectively the downlevelled equivalent of
// ```
// $localize `...`
// ```
// which is effectively like:
// ```
// $localize(__makeTemplateObject(cooked, raw), expression1, expression2, ...);
// ```
ctx.print(ast, `$localize(${makeTemplateObjectPolyfill}(`);
const parts = [ast.serializeI18nHead()];
for (let i = 1; i < ast.messageParts.length; i++) {
parts.push(ast.serializeI18nTemplatePart(i));
}
ctx.print(ast, `[${parts.map(part => escapeIdentifier(part.cooked, false)).join(', ')}], `);
ctx.print(ast, `[${parts.map(part => escapeIdentifier(part.raw, false)).join(', ')}])`);
ast.expressions.forEach(expression => {
ctx.print(ast, ', ');
expression.visitExpression(this, ctx);
});
ctx.print(ast, ')');
return null;
}
_visitParams(params, ctx) {
this.visitAllObjects(param => ctx.print(null, param.name), params, ctx, ',');
}
getBuiltinMethodName(method) {
let 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 Error(`Unknown builtin method: ${method}`);
}
return name;
}
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\n\nimport {AbstractEmitterVisitor, CATCH_ERROR_VAR, CATCH_STACK_VAR, EmitterVisitorContext, escapeIdentifier} from './abstract_emitter';\nimport * as o from './output_ast';\n\n/**\n * In TypeScript, tagged template functions expect a \"template object\", which is an array of\n * \"cooked\" strings plus a `raw` property that contains an array of \"raw\" strings. This is\n * typically constructed with a function called `__makeTemplateObject(cooked, raw)`, but it may not\n * be available in all environments.\n *\n * This is a JavaScript polyfill that uses __makeTemplateObject when it's available, but otherwise\n * creates an inline helper with the same functionality.\n *\n * In the inline function, if `Object.defineProperty` is available we use that to attach the `raw`\n * array.\n */\nconst makeTemplateObjectPolyfill =\n    '(this&&this.__makeTemplateObject||function(e,t){return Object.defineProperty?Object.defineProperty(e,\"raw\",{value:t}):e.raw=t,e})';\n\nexport abstract class AbstractJsEmitterVisitor extends AbstractEmitterVisitor {\n  constructor() {\n    super(false);\n  }\n  override visitDeclareClassStmt(stmt: o.ClassStmt, ctx: EmitterVisitorContext): any {\n    ctx.pushClass(stmt);\n    this._visitClassConstructor(stmt, ctx);\n\n    if (stmt.parent != null) {\n      ctx.print(stmt, `${stmt.name}.prototype = Object.create(`);\n      stmt.parent.visitExpression(this, ctx);\n      ctx.println(stmt, `.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(stmt, `function ${stmt.name}(`);\n    if (stmt.constructorMethod != null) {\n      this._visitParams(stmt.constructorMethod.params, ctx);\n    }\n    ctx.println(stmt, `) {`);\n    ctx.incIndent();\n    if (stmt.constructorMethod != null) {\n      if (stmt.constructorMethod.body.length > 0) {\n        ctx.println(stmt, `var self = this;`);\n        this.visitAllStatements(stmt.constructorMethod.body, ctx);\n      }\n    }\n    ctx.decIndent();\n    ctx.println(stmt, `}`);\n  }\n\n  private _visitClassGetter(stmt: o.ClassStmt, getter: o.ClassGetter, ctx: EmitterVisitorContext) {\n    ctx.println(\n        stmt,\n        `Object.defineProperty(${stmt.name}.prototype, '${getter.name}', { get: function() {`);\n    ctx.incIndent();\n    if (getter.body.length > 0) {\n      ctx.println(stmt, `var self = this;`);\n      this.visitAllStatements(getter.body, ctx);\n    }\n    ctx.decIndent();\n    ctx.println(stmt, `}});`);\n  }\n\n  private _visitClassMethod(stmt: o.ClassStmt, method: o.ClassMethod, ctx: EmitterVisitorContext) {\n    ctx.print(stmt, `${stmt.name}.prototype.${method.name} = function(`);\n    this._visitParams(method.params, ctx);\n    ctx.println(stmt, `) {`);\n    ctx.incIndent();\n    if (method.body.length > 0) {\n      ctx.println(stmt, `var self = this;`);\n      this.visitAllStatements(method.body, ctx);\n    }\n    ctx.decIndent();\n    ctx.println(stmt, `};`);\n  }\n\n  override visitWrappedNodeExpr(ast: o.WrappedNodeExpr<any>, ctx: EmitterVisitorContext): any {\n    throw new Error('Cannot emit a WrappedNodeExpr in Javascript.');\n  }\n\n  override visitReadVarExpr(ast: o.ReadVarExpr, ctx: EmitterVisitorContext): string|null {\n    if (ast.builtin === o.BuiltinVar.This) {\n      ctx.print(ast, 'self');\n    } else if (ast.builtin === o.BuiltinVar.Super) {\n      throw new Error(\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  override visitDeclareVarStmt(stmt: o.DeclareVarStmt, ctx: EmitterVisitorContext): any {\n    ctx.print(stmt, `var ${stmt.name}`);\n    if (stmt.value) {\n      ctx.print(stmt, ' = ');\n      stmt.value.visitExpression(this, ctx);\n    }\n    ctx.println(stmt, `;`);\n    return null;\n  }\n  override visitCastExpr(ast: o.CastExpr, ctx: EmitterVisitorContext): any {\n    ast.value.visitExpression(this, ctx);\n    return null;\n  }\n  override visitInvokeFunctionExpr(expr: o.InvokeFunctionExpr, ctx: EmitterVisitorContext): string\n      |null {\n    const fnExpr = expr.fn;\n    if (fnExpr instanceof o.ReadVarExpr && fnExpr.builtin === o.BuiltinVar.Super) {\n      ctx.currentClass!.parent!.visitExpression(this, ctx);\n      ctx.print(expr, `.call(this`);\n      if (expr.args.length > 0) {\n        ctx.print(expr, `, `);\n        this.visitAllExpressions(expr.args, ctx, ',');\n      }\n      ctx.print(expr, `)`);\n    } else {\n      super.visitInvokeFunctionExpr(expr, ctx);\n    }\n    return null;\n  }\n  override visitTaggedTemplateExpr(ast: o.TaggedTemplateExpr, ctx: EmitterVisitorContext): any {\n    // The following convoluted piece of code is effectively the downlevelled equivalent of\n    // ```\n    // tag`...`\n    // ```\n    // which is effectively like:\n    // ```\n    // tag(__makeTemplateObject(cooked, raw), expression1, expression2, ...);\n    // ```\n    const elements = ast.template.elements;\n    ast.tag.visitExpression(this, ctx);\n    ctx.print(ast, `(${makeTemplateObjectPolyfill}(`);\n    ctx.print(ast, `[${elements.map(part => escapeIdentifier(part.text, false)).join(', ')}], `);\n    ctx.print(ast, `[${elements.map(part => escapeIdentifier(part.rawText, false)).join(', ')}])`);\n    ast.template.expressions.forEach(expression => {\n      ctx.print(ast, ', ');\n      expression.visitExpression(this, ctx);\n    });\n    ctx.print(ast, ')');\n    return null;\n  }\n  override visitFunctionExpr(ast: o.FunctionExpr, ctx: EmitterVisitorContext): any {\n    ctx.print(ast, `function${ast.name ? ' ' + ast.name : ''}(`);\n    this._visitParams(ast.params, ctx);\n    ctx.println(ast, `) {`);\n    ctx.incIndent();\n    this.visitAllStatements(ast.statements, ctx);\n    ctx.decIndent();\n    ctx.print(ast, `}`);\n    return null;\n  }\n  override visitDeclareFunctionStmt(stmt: o.DeclareFunctionStmt, ctx: EmitterVisitorContext): any {\n    ctx.print(stmt, `function ${stmt.name}(`);\n    this._visitParams(stmt.params, ctx);\n    ctx.println(stmt, `) {`);\n    ctx.incIndent();\n    this.visitAllStatements(stmt.statements, ctx);\n    ctx.decIndent();\n    ctx.println(stmt, `}`);\n    return null;\n  }\n  override visitTryCatchStmt(stmt: o.TryCatchStmt, ctx: EmitterVisitorContext): any {\n    ctx.println(stmt, `try {`);\n    ctx.incIndent();\n    this.visitAllStatements(stmt.bodyStmts, ctx);\n    ctx.decIndent();\n    ctx.println(stmt, `} catch (${CATCH_ERROR_VAR.name}) {`);\n    ctx.incIndent();\n    const catchStmts =\n        [<o.Statement>CATCH_STACK_VAR.set(CATCH_ERROR_VAR.prop('stack')).toDeclStmt(null, [\n          o.StmtModifier.Final\n        ])].concat(stmt.catchStmts);\n    this.visitAllStatements(catchStmts, ctx);\n    ctx.decIndent();\n    ctx.println(stmt, `}`);\n    return null;\n  }\n\n  override visitLocalizedString(ast: o.LocalizedString, ctx: EmitterVisitorContext): any {\n    // The following convoluted piece of code is effectively the downlevelled equivalent of\n    // ```\n    // $localize `...`\n    // ```\n    // which is effectively like:\n    // ```\n    // $localize(__makeTemplateObject(cooked, raw), expression1, expression2, ...);\n    // ```\n    ctx.print(ast, `$localize(${makeTemplateObjectPolyfill}(`);\n    const parts = [ast.serializeI18nHead()];\n    for (let i = 1; i < ast.messageParts.length; i++) {\n      parts.push(ast.serializeI18nTemplatePart(i));\n    }\n    ctx.print(ast, `[${parts.map(part => escapeIdentifier(part.cooked, false)).join(', ')}], `);\n    ctx.print(ast, `[${parts.map(part => escapeIdentifier(part.raw, false)).join(', ')}])`);\n    ast.expressions.forEach(expression => {\n      ctx.print(ast, ', ');\n      expression.visitExpression(this, ctx);\n    });\n    ctx.print(ast, ')');\n    return null;\n  }\n\n  private _visitParams(params: o.FnParam[], ctx: EmitterVisitorContext): void {\n    this.visitAllObjects(param => ctx.print(null, param.name), params, ctx, ',');\n  }\n\n  override getBuiltinMethodName(method: o.BuiltinMethod): string {\n    let name: string;\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 Error(`Unknown builtin method: ${method}`);\n    }\n    return name;\n  }\n}\n"]}