98 lines
3.8 KiB
TypeScript
98 lines
3.8 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {ViewEncapsulation} from '@angular/core';
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import {CompileDirectiveMetadata, CompileIdentifierMetadata, CompileStylesheetMetadata, identifierModuleUrl, identifierName} from './compile_metadata';
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import {CompilerInjectable} from './injectable';
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import * as o from './output/output_ast';
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import {ShadowCss} from './shadow_css';
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import {UrlResolver} from './url_resolver';
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const COMPONENT_VARIABLE = '%COMP%';
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const HOST_ATTR = `_nghost-${COMPONENT_VARIABLE}`;
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const CONTENT_ATTR = `_ngcontent-${COMPONENT_VARIABLE}`;
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export class StylesCompileDependency {
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constructor(
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public name: string, public moduleUrl: string, public isShimmed: boolean,
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public valuePlaceholder: CompileIdentifierMetadata) {}
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}
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export class StylesCompileResult {
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constructor(
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public componentStylesheet: CompiledStylesheet,
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public externalStylesheets: CompiledStylesheet[]) {}
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}
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export class CompiledStylesheet {
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constructor(
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public statements: o.Statement[], public stylesVar: string,
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public dependencies: StylesCompileDependency[], public isShimmed: boolean,
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public meta: CompileStylesheetMetadata) {}
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}
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@CompilerInjectable()
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export class StyleCompiler {
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private _shadowCss: ShadowCss = new ShadowCss();
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constructor(private _urlResolver: UrlResolver) {}
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compileComponent(comp: CompileDirectiveMetadata): StylesCompileResult {
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const template = comp.template !;
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const externalStylesheets: CompiledStylesheet[] = [];
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const componentStylesheet: CompiledStylesheet = this._compileStyles(
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comp, new CompileStylesheetMetadata({
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styles: template.styles,
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styleUrls: template.styleUrls,
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moduleUrl: identifierModuleUrl(comp.type)
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}),
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true);
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template.externalStylesheets.forEach((stylesheetMeta) => {
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const compiledStylesheet = this._compileStyles(comp, stylesheetMeta, false);
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externalStylesheets.push(compiledStylesheet);
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});
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return new StylesCompileResult(componentStylesheet, externalStylesheets);
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}
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private _compileStyles(
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comp: CompileDirectiveMetadata, stylesheet: CompileStylesheetMetadata,
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isComponentStylesheet: boolean): CompiledStylesheet {
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const shim = comp.template !.encapsulation === ViewEncapsulation.Emulated;
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const styleExpressions =
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stylesheet.styles.map(plainStyle => o.literal(this._shimIfNeeded(plainStyle, shim)));
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const dependencies: StylesCompileDependency[] = [];
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for (let i = 0; i < stylesheet.styleUrls.length; i++) {
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const identifier: CompileIdentifierMetadata = {reference: null};
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dependencies.push(new StylesCompileDependency(
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getStylesVarName(null), stylesheet.styleUrls[i], shim, identifier));
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styleExpressions.push(new o.ExternalExpr(identifier));
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}
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// styles variable contains plain strings and arrays of other styles arrays (recursive),
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// so we set its type to dynamic.
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const stylesVar = getStylesVarName(isComponentStylesheet ? comp : null);
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const stmt = o.variable(stylesVar)
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.set(o.literalArr(
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styleExpressions, new o.ArrayType(o.DYNAMIC_TYPE, [o.TypeModifier.Const])))
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.toDeclStmt(null, [o.StmtModifier.Final]);
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return new CompiledStylesheet([stmt], stylesVar, dependencies, shim, stylesheet);
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}
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private _shimIfNeeded(style: string, shim: boolean): string {
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return shim ? this._shadowCss.shimCssText(style, CONTENT_ATTR, HOST_ATTR) : style;
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}
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}
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function getStylesVarName(component: CompileDirectiveMetadata | null): string {
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let result = `styles`;
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if (component) {
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result += `_${identifierName(component.type)}`;
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}
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return result;
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}
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