@angular/compiler
Version:
Angular - the compiler library
152 lines • 18.4 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 { AstPath } from '../ast_path';
export class NodeWithI18n {
constructor(sourceSpan, i18n) {
this.sourceSpan = sourceSpan;
this.i18n = i18n;
}
}
export class Text extends NodeWithI18n {
constructor(value, sourceSpan, i18n) {
super(sourceSpan, i18n);
this.value = value;
}
visit(visitor, context) {
return visitor.visitText(this, context);
}
}
export class Expansion extends NodeWithI18n {
constructor(switchValue, type, cases, sourceSpan, switchValueSourceSpan, i18n) {
super(sourceSpan, i18n);
this.switchValue = switchValue;
this.type = type;
this.cases = cases;
this.switchValueSourceSpan = switchValueSourceSpan;
}
visit(visitor, context) {
return visitor.visitExpansion(this, context);
}
}
export class ExpansionCase {
constructor(value, expression, sourceSpan, valueSourceSpan, expSourceSpan) {
this.value = value;
this.expression = expression;
this.sourceSpan = sourceSpan;
this.valueSourceSpan = valueSourceSpan;
this.expSourceSpan = expSourceSpan;
}
visit(visitor, context) {
return visitor.visitExpansionCase(this, context);
}
}
export class Attribute extends NodeWithI18n {
constructor(name, value, sourceSpan, valueSpan, i18n) {
super(sourceSpan, i18n);
this.name = name;
this.value = value;
this.valueSpan = valueSpan;
}
visit(visitor, context) {
return visitor.visitAttribute(this, context);
}
}
export class Element extends NodeWithI18n {
constructor(name, attrs, children, sourceSpan, startSourceSpan, endSourceSpan = null, i18n) {
super(sourceSpan, i18n);
this.name = name;
this.attrs = attrs;
this.children = children;
this.startSourceSpan = startSourceSpan;
this.endSourceSpan = endSourceSpan;
}
visit(visitor, context) {
return visitor.visitElement(this, context);
}
}
export class Comment {
constructor(value, sourceSpan) {
this.value = value;
this.sourceSpan = sourceSpan;
}
visit(visitor, context) {
return visitor.visitComment(this, context);
}
}
export function visitAll(visitor, nodes, context = null) {
const result = [];
const visit = visitor.visit ?
(ast) => visitor.visit(ast, context) || ast.visit(visitor, context) :
(ast) => ast.visit(visitor, context);
nodes.forEach(ast => {
const astResult = visit(ast);
if (astResult) {
result.push(astResult);
}
});
return result;
}
export class RecursiveVisitor {
constructor() { }
visitElement(ast, context) {
this.visitChildren(context, visit => {
visit(ast.attrs);
visit(ast.children);
});
}
visitAttribute(ast, context) { }
visitText(ast, context) { }
visitComment(ast, context) { }
visitExpansion(ast, context) {
return this.visitChildren(context, visit => {
visit(ast.cases);
});
}
visitExpansionCase(ast, context) { }
visitChildren(context, cb) {
let results = [];
let t = this;
function visit(children) {
if (children)
results.push(visitAll(t, children, context));
}
cb(visit);
return Array.prototype.concat.apply([], results);
}
}
function spanOf(ast) {
const start = ast.sourceSpan.start.offset;
let end = ast.sourceSpan.end.offset;
if (ast instanceof Element) {
if (ast.endSourceSpan) {
end = ast.endSourceSpan.end.offset;
}
else if (ast.children && ast.children.length) {
end = spanOf(ast.children[ast.children.length - 1]).end;
}
}
return { start, end };
}
export function findNode(nodes, position) {
const path = [];
const visitor = new class extends RecursiveVisitor {
visit(ast, context) {
const span = spanOf(ast);
if (span.start <= position && position < span.end) {
path.push(ast);
}
else {
// Returning a value here will result in the children being skipped.
return true;
}
}
};
visitAll(visitor, nodes);
return new AstPath(path, position);
}
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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 {AstPath} from '../ast_path';\nimport {I18nMeta} from '../i18n/i18n_ast';\nimport {ParseSourceSpan} from '../parse_util';\n\nexport interface Node {\n  sourceSpan: ParseSourceSpan;\n  visit(visitor: Visitor, context: any): any;\n}\n\nexport abstract class NodeWithI18n implements Node {\n  constructor(public sourceSpan: ParseSourceSpan, public i18n?: I18nMeta) {}\n  abstract visit(visitor: Visitor, context: any): any;\n}\n\nexport class Text extends NodeWithI18n {\n  constructor(public value: string, sourceSpan: ParseSourceSpan, i18n?: I18nMeta) {\n    super(sourceSpan, i18n);\n  }\n  visit(visitor: Visitor, context: any): any {\n    return visitor.visitText(this, context);\n  }\n}\n\nexport class Expansion extends NodeWithI18n {\n  constructor(\n      public switchValue: string, public type: string, public cases: ExpansionCase[],\n      sourceSpan: ParseSourceSpan, public switchValueSourceSpan: ParseSourceSpan, i18n?: I18nMeta) {\n    super(sourceSpan, i18n);\n  }\n  visit(visitor: Visitor, context: any): any {\n    return visitor.visitExpansion(this, context);\n  }\n}\n\nexport class ExpansionCase implements Node {\n  constructor(\n      public value: string, public expression: Node[], public sourceSpan: ParseSourceSpan,\n      public valueSourceSpan: ParseSourceSpan, public expSourceSpan: ParseSourceSpan) {}\n\n  visit(visitor: Visitor, context: any): any {\n    return visitor.visitExpansionCase(this, context);\n  }\n}\n\nexport class Attribute extends NodeWithI18n {\n  constructor(\n      public name: string, public value: string, sourceSpan: ParseSourceSpan,\n      public valueSpan?: ParseSourceSpan, i18n?: I18nMeta) {\n    super(sourceSpan, i18n);\n  }\n  visit(visitor: Visitor, context: any): any {\n    return visitor.visitAttribute(this, context);\n  }\n}\n\nexport class Element extends NodeWithI18n {\n  constructor(\n      public name: string, public attrs: Attribute[], public children: Node[],\n      sourceSpan: ParseSourceSpan, public startSourceSpan: ParseSourceSpan,\n      public endSourceSpan: ParseSourceSpan|null = null, i18n?: I18nMeta) {\n    super(sourceSpan, i18n);\n  }\n  visit(visitor: Visitor, context: any): any {\n    return visitor.visitElement(this, context);\n  }\n}\n\nexport class Comment implements Node {\n  constructor(public value: string|null, public sourceSpan: ParseSourceSpan) {}\n  visit(visitor: Visitor, context: any): any {\n    return visitor.visitComment(this, context);\n  }\n}\n\nexport interface Visitor {\n  // Returning a truthy value from `visit()` will prevent `visitAll()` from the call to the typed\n  // method and result returned will become the result included in `visitAll()`s result array.\n  visit?(node: Node, context: any): any;\n\n  visitElement(element: Element, context: any): any;\n  visitAttribute(attribute: Attribute, context: any): any;\n  visitText(text: Text, context: any): any;\n  visitComment(comment: Comment, context: any): any;\n  visitExpansion(expansion: Expansion, context: any): any;\n  visitExpansionCase(expansionCase: ExpansionCase, context: any): any;\n}\n\nexport function visitAll(visitor: Visitor, nodes: Node[], context: any = null): any[] {\n  const result: any[] = [];\n\n  const visit = visitor.visit ?\n      (ast: Node) => visitor.visit!(ast, context) || ast.visit(visitor, context) :\n      (ast: Node) => ast.visit(visitor, context);\n  nodes.forEach(ast => {\n    const astResult = visit(ast);\n    if (astResult) {\n      result.push(astResult);\n    }\n  });\n  return result;\n}\n\nexport class RecursiveVisitor implements Visitor {\n  constructor() {}\n\n  visitElement(ast: Element, context: any): any {\n    this.visitChildren(context, visit => {\n      visit(ast.attrs);\n      visit(ast.children);\n    });\n  }\n\n  visitAttribute(ast: Attribute, context: any): any {}\n  visitText(ast: Text, context: any): any {}\n  visitComment(ast: Comment, context: any): any {}\n\n  visitExpansion(ast: Expansion, context: any): any {\n    return this.visitChildren(context, visit => {\n      visit(ast.cases);\n    });\n  }\n\n  visitExpansionCase(ast: ExpansionCase, context: any): any {}\n\n  private visitChildren<T extends Node>(\n      context: any, cb: (visit: (<V extends Node>(children: V[]|undefined) => void)) => void) {\n    let results: any[][] = [];\n    let t = this;\n    function visit<T extends Node>(children: T[]|undefined) {\n      if (children) results.push(visitAll(t, children, context));\n    }\n    cb(visit);\n    return Array.prototype.concat.apply([], results);\n  }\n}\n\nexport type HtmlAstPath = AstPath<Node>;\n\nfunction spanOf(ast: Node) {\n  const start = ast.sourceSpan.start.offset;\n  let end = ast.sourceSpan.end.offset;\n  if (ast instanceof Element) {\n    if (ast.endSourceSpan) {\n      end = ast.endSourceSpan.end.offset;\n    } else if (ast.children && ast.children.length) {\n      end = spanOf(ast.children[ast.children.length - 1]).end;\n    }\n  }\n  return {start, end};\n}\n\nexport function findNode(nodes: Node[], position: number): HtmlAstPath {\n  const path: Node[] = [];\n\n  const visitor = new class extends RecursiveVisitor {\n    visit(ast: Node, context: any): any {\n      const span = spanOf(ast);\n      if (span.start <= position && position < span.end) {\n        path.push(ast);\n      } else {\n        // Returning a value here will result in the children being skipped.\n        return true;\n      }\n    }\n  };\n\n  visitAll(visitor, nodes);\n\n  return new AstPath<Node>(path, position);\n}\n"]}