@angular/compiler
Version:
Angular - the compiler library
81 lines • 13.1 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 { CompileStylesheetMetadata, identifierModuleUrl, identifierName } from './compile_metadata';
import { ViewEncapsulation } from './core';
import * as o from './output/output_ast';
import { ShadowCss } from './shadow_css';
const COMPONENT_VARIABLE = '%COMP%';
export const HOST_ATTR = `_nghost-${COMPONENT_VARIABLE}`;
export const CONTENT_ATTR = `_ngcontent-${COMPONENT_VARIABLE}`;
export class StylesCompileDependency {
constructor(name, moduleUrl, setValue) {
this.name = name;
this.moduleUrl = moduleUrl;
this.setValue = setValue;
}
}
export class CompiledStylesheet {
constructor(outputCtx, stylesVar, dependencies, isShimmed, meta) {
this.outputCtx = outputCtx;
this.stylesVar = stylesVar;
this.dependencies = dependencies;
this.isShimmed = isShimmed;
this.meta = meta;
}
}
export class StyleCompiler {
constructor(_urlResolver) {
this._urlResolver = _urlResolver;
this._shadowCss = new ShadowCss();
}
compileComponent(outputCtx, comp) {
const template = comp.template;
return this._compileStyles(outputCtx, comp, new CompileStylesheetMetadata({
styles: template.styles,
styleUrls: template.styleUrls,
moduleUrl: identifierModuleUrl(comp.type)
}), this.needsStyleShim(comp), true);
}
compileStyles(outputCtx, comp, stylesheet, shim = this.needsStyleShim(comp)) {
return this._compileStyles(outputCtx, comp, stylesheet, shim, false);
}
needsStyleShim(comp) {
return comp.template.encapsulation === ViewEncapsulation.Emulated;
}
_compileStyles(outputCtx, comp, stylesheet, shim, isComponentStylesheet) {
const styleExpressions = stylesheet.styles.map(plainStyle => o.literal(this._shimIfNeeded(plainStyle, shim)));
const dependencies = [];
stylesheet.styleUrls.forEach((styleUrl) => {
const exprIndex = styleExpressions.length;
// Note: This placeholder will be filled later.
styleExpressions.push(null);
dependencies.push(new StylesCompileDependency(getStylesVarName(null), styleUrl, (value) => styleExpressions[exprIndex] = outputCtx.importExpr(value)));
});
// styles variable contains plain strings and arrays of other styles arrays (recursive),
// so we set its type to dynamic.
const stylesVar = getStylesVarName(isComponentStylesheet ? comp : null);
const stmt = o.variable(stylesVar)
.set(o.literalArr(styleExpressions, new o.ArrayType(o.DYNAMIC_TYPE, [o.TypeModifier.Const])))
.toDeclStmt(null, isComponentStylesheet ? [o.StmtModifier.Final] : [
o.StmtModifier.Final, o.StmtModifier.Exported
]);
outputCtx.statements.push(stmt);
return new CompiledStylesheet(outputCtx, stylesVar, dependencies, shim, stylesheet);
}
_shimIfNeeded(style, shim) {
return shim ? this._shadowCss.shimCssText(style, CONTENT_ATTR, HOST_ATTR) : style;
}
}
function getStylesVarName(component) {
let result = `styles`;
if (component) {
result += `_${identifierName(component.type)}`;
}
return result;
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {CompileDirectiveMetadata, CompileIdentifierMetadata, CompileStylesheetMetadata, identifierModuleUrl, identifierName} from './compile_metadata';\nimport {ViewEncapsulation} from './core';\nimport * as o from './output/output_ast';\nimport {ShadowCss} from './shadow_css';\nimport {UrlResolver} from './url_resolver';\nimport {OutputContext} from './util';\n\nconst COMPONENT_VARIABLE = '%COMP%';\nexport const HOST_ATTR = `_nghost-${COMPONENT_VARIABLE}`;\nexport const CONTENT_ATTR = `_ngcontent-${COMPONENT_VARIABLE}`;\n\nexport class StylesCompileDependency {\n  constructor(\n      public name: string, public moduleUrl: string, public setValue: (value: any) => void) {}\n}\n\nexport class CompiledStylesheet {\n  constructor(\n      public outputCtx: OutputContext, public stylesVar: string,\n      public dependencies: StylesCompileDependency[], public isShimmed: boolean,\n      public meta: CompileStylesheetMetadata) {}\n}\n\nexport class StyleCompiler {\n  private _shadowCss: ShadowCss = new ShadowCss();\n\n  constructor(private _urlResolver: UrlResolver) {}\n\n  compileComponent(outputCtx: OutputContext, comp: CompileDirectiveMetadata): CompiledStylesheet {\n    const template = comp.template !;\n    return this._compileStyles(\n        outputCtx, comp, new CompileStylesheetMetadata({\n          styles: template.styles,\n          styleUrls: template.styleUrls,\n          moduleUrl: identifierModuleUrl(comp.type)\n        }),\n        this.needsStyleShim(comp), true);\n  }\n\n  compileStyles(\n      outputCtx: OutputContext, comp: CompileDirectiveMetadata,\n      stylesheet: CompileStylesheetMetadata,\n      shim: boolean = this.needsStyleShim(comp)): CompiledStylesheet {\n    return this._compileStyles(outputCtx, comp, stylesheet, shim, false);\n  }\n\n  needsStyleShim(comp: CompileDirectiveMetadata): boolean {\n    return comp.template !.encapsulation === ViewEncapsulation.Emulated;\n  }\n\n  private _compileStyles(\n      outputCtx: OutputContext, comp: CompileDirectiveMetadata,\n      stylesheet: CompileStylesheetMetadata, shim: boolean,\n      isComponentStylesheet: boolean): CompiledStylesheet {\n    const styleExpressions: o.Expression[] =\n        stylesheet.styles.map(plainStyle => o.literal(this._shimIfNeeded(plainStyle, shim)));\n    const dependencies: StylesCompileDependency[] = [];\n    stylesheet.styleUrls.forEach((styleUrl) => {\n      const exprIndex = styleExpressions.length;\n      // Note: This placeholder will be filled later.\n      styleExpressions.push(null!);\n      dependencies.push(new StylesCompileDependency(\n          getStylesVarName(null), styleUrl,\n          (value) => styleExpressions[exprIndex] = outputCtx.importExpr(value)));\n    });\n    // styles variable contains plain strings and arrays of other styles arrays (recursive),\n    // so we set its type to dynamic.\n    const stylesVar = getStylesVarName(isComponentStylesheet ? comp : null);\n    const stmt = o.variable(stylesVar)\n                     .set(o.literalArr(\n                         styleExpressions, new o.ArrayType(o.DYNAMIC_TYPE, [o.TypeModifier.Const])))\n                     .toDeclStmt(null, isComponentStylesheet ? [o.StmtModifier.Final] : [\n                       o.StmtModifier.Final, o.StmtModifier.Exported\n                     ]);\n    outputCtx.statements.push(stmt);\n    return new CompiledStylesheet(outputCtx, stylesVar, dependencies, shim, stylesheet);\n  }\n\n  private _shimIfNeeded(style: string, shim: boolean): string {\n    return shim ? this._shadowCss.shimCssText(style, CONTENT_ATTR, HOST_ATTR) : style;\n  }\n}\n\nfunction getStylesVarName(component: CompileDirectiveMetadata|null): string {\n  let result = `styles`;\n  if (component) {\n    result += `_${identifierName(component.type)}`;\n  }\n  return result;\n}\n"]}