@angular/compiler
Version:
Angular - the compiler library
109 lines • 16.8 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
*/
(function (factory) {
if (typeof module === "object" && typeof module.exports === "object") {
var v = factory(require, exports);
if (v !== undefined) module.exports = v;
}
else if (typeof define === "function" && define.amd) {
define("@angular/compiler/src/ml_parser/html_whitespaces", ["require", "exports", "@angular/compiler/src/ml_parser/ast", "@angular/compiler/src/ml_parser/parser", "@angular/compiler/src/ml_parser/tags"], factory);
}
})(function (require, exports) {
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.removeWhitespaces = exports.WhitespaceVisitor = exports.replaceNgsp = exports.PRESERVE_WS_ATTR_NAME = void 0;
var html = require("@angular/compiler/src/ml_parser/ast");
var parser_1 = require("@angular/compiler/src/ml_parser/parser");
var tags_1 = require("@angular/compiler/src/ml_parser/tags");
exports.PRESERVE_WS_ATTR_NAME = 'ngPreserveWhitespaces';
var SKIP_WS_TRIM_TAGS = new Set(['pre', 'template', 'textarea', 'script', 'style']);
// Equivalent to \s with \u00a0 (non-breaking space) excluded.
// Based on https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp
var WS_CHARS = ' \f\n\r\t\v\u1680\u180e\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff';
var NO_WS_REGEXP = new RegExp("[^" + WS_CHARS + "]");
var WS_REPLACE_REGEXP = new RegExp("[" + WS_CHARS + "]{2,}", 'g');
function hasPreserveWhitespacesAttr(attrs) {
return attrs.some(function (attr) { return attr.name === exports.PRESERVE_WS_ATTR_NAME; });
}
/**
* Angular Dart introduced &ngsp; as a placeholder for non-removable space, see:
* https://github.com/dart-lang/angular/blob/0bb611387d29d65b5af7f9d2515ab571fd3fbee4/_tests/test/compiler/preserve_whitespace_test.dart#L25-L32
* In Angular Dart &ngsp; is converted to the 0xE500 PUA (Private Use Areas) unicode character
* and later on replaced by a space. We are re-implementing the same idea here.
*/
function replaceNgsp(value) {
// lexer is replacing the &ngsp; pseudo-entity with NGSP_UNICODE
return value.replace(new RegExp(tags_1.NGSP_UNICODE, 'g'), ' ');
}
exports.replaceNgsp = replaceNgsp;
/**
* This visitor can walk HTML parse tree and remove / trim text nodes using the following rules:
* - consider spaces, tabs and new lines as whitespace characters;
* - drop text nodes consisting of whitespace characters only;
* - for all other text nodes replace consecutive whitespace characters with one space;
* - convert &ngsp; pseudo-entity to a single space;
*
* Removal and trimming of whitespaces have positive performance impact (less code to generate
* while compiling templates, faster view creation). At the same time it can be "destructive"
* in some cases (whitespaces can influence layout). Because of the potential of breaking layout
* this visitor is not activated by default in Angular 5 and people need to explicitly opt-in for
* whitespace removal. The default option for whitespace removal will be revisited in Angular 6
* and might be changed to "on" by default.
*/
var WhitespaceVisitor = /** @class */ (function () {
function WhitespaceVisitor() {
}
WhitespaceVisitor.prototype.visitElement = function (element, context) {
if (SKIP_WS_TRIM_TAGS.has(element.name) || hasPreserveWhitespacesAttr(element.attrs)) {
// don't descent into elements where we need to preserve whitespaces
// but still visit all attributes to eliminate one used as a market to preserve WS
return new html.Element(element.name, html.visitAll(this, element.attrs), element.children, element.sourceSpan, element.startSourceSpan, element.endSourceSpan, element.i18n);
}
return new html.Element(element.name, element.attrs, visitAllWithSiblings(this, element.children), element.sourceSpan, element.startSourceSpan, element.endSourceSpan, element.i18n);
};
WhitespaceVisitor.prototype.visitAttribute = function (attribute, context) {
return attribute.name !== exports.PRESERVE_WS_ATTR_NAME ? attribute : null;
};
WhitespaceVisitor.prototype.visitText = function (text, context) {
var isNotBlank = text.value.match(NO_WS_REGEXP);
var hasExpansionSibling = context &&
(context.prev instanceof html.Expansion || context.next instanceof html.Expansion);
if (isNotBlank || hasExpansionSibling) {
return new html.Text(replaceNgsp(text.value).replace(WS_REPLACE_REGEXP, ' '), text.sourceSpan, text.i18n);
}
return null;
};
WhitespaceVisitor.prototype.visitComment = function (comment, context) {
return comment;
};
WhitespaceVisitor.prototype.visitExpansion = function (expansion, context) {
return expansion;
};
WhitespaceVisitor.prototype.visitExpansionCase = function (expansionCase, context) {
return expansionCase;
};
return WhitespaceVisitor;
}());
exports.WhitespaceVisitor = WhitespaceVisitor;
function removeWhitespaces(htmlAstWithErrors) {
return new parser_1.ParseTreeResult(html.visitAll(new WhitespaceVisitor(), htmlAstWithErrors.rootNodes), htmlAstWithErrors.errors);
}
exports.removeWhitespaces = removeWhitespaces;
function visitAllWithSiblings(visitor, nodes) {
var result = [];
nodes.forEach(function (ast, i) {
var context = { prev: nodes[i - 1], next: nodes[i + 1] };
var astResult = ast.visit(visitor, context);
if (astResult) {
result.push(astResult);
}
});
return result;
}
});
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We are re-implementing the same idea here.\n */\nexport function replaceNgsp(value: string): string {\n  // lexer is replacing the &ngsp; pseudo-entity with NGSP_UNICODE\n  return value.replace(new RegExp(NGSP_UNICODE, 'g'), ' ');\n}\n\n/**\n * This visitor can walk HTML parse tree and remove / trim text nodes using the following rules:\n * - consider spaces, tabs and new lines as whitespace characters;\n * - drop text nodes consisting of whitespace characters only;\n * - for all other text nodes replace consecutive whitespace characters with one space;\n * - convert &ngsp; pseudo-entity to a single space;\n *\n * Removal and trimming of whitespaces have positive performance impact (less code to generate\n * while compiling templates, faster view creation). At the same time it can be \"destructive\"\n * in some cases (whitespaces can influence layout). Because of the potential of breaking layout\n * this visitor is not activated by default in Angular 5 and people need to explicitly opt-in for\n * whitespace removal. The default option for whitespace removal will be revisited in Angular 6\n * and might be changed to \"on\" by default.\n */\nexport class WhitespaceVisitor implements html.Visitor {\n  visitElement(element: html.Element, context: any): any {\n    if (SKIP_WS_TRIM_TAGS.has(element.name) || hasPreserveWhitespacesAttr(element.attrs)) {\n      // don't descent into elements where we need to preserve whitespaces\n      // but still visit all attributes to eliminate one used as a market to preserve WS\n      return new html.Element(\n          element.name, html.visitAll(this, element.attrs), element.children, element.sourceSpan,\n          element.startSourceSpan, element.endSourceSpan, element.i18n);\n    }\n\n    return new html.Element(\n        element.name, element.attrs, visitAllWithSiblings(this, element.children),\n        element.sourceSpan, element.startSourceSpan, element.endSourceSpan, element.i18n);\n  }\n\n  visitAttribute(attribute: html.Attribute, context: any): any {\n    return attribute.name !== PRESERVE_WS_ATTR_NAME ? attribute : null;\n  }\n\n  visitText(text: html.Text, context: SiblingVisitorContext|null): any {\n    const isNotBlank = text.value.match(NO_WS_REGEXP);\n    const hasExpansionSibling = context &&\n        (context.prev instanceof html.Expansion || context.next instanceof html.Expansion);\n\n    if (isNotBlank || hasExpansionSibling) {\n      return new html.Text(\n          replaceNgsp(text.value).replace(WS_REPLACE_REGEXP, ' '), text.sourceSpan, text.i18n);\n    }\n\n    return null;\n  }\n\n  visitComment(comment: html.Comment, context: any): any {\n    return comment;\n  }\n\n  visitExpansion(expansion: html.Expansion, context: any): any {\n    return expansion;\n  }\n\n  visitExpansionCase(expansionCase: html.ExpansionCase, context: any): any {\n    return expansionCase;\n  }\n}\n\nexport function removeWhitespaces(htmlAstWithErrors: ParseTreeResult): ParseTreeResult {\n  return new ParseTreeResult(\n      html.visitAll(new WhitespaceVisitor(), htmlAstWithErrors.rootNodes),\n      htmlAstWithErrors.errors);\n}\n\ninterface SiblingVisitorContext {\n  prev: html.Node|undefined;\n  next: html.Node|undefined;\n}\n\nfunction visitAllWithSiblings(visitor: WhitespaceVisitor, nodes: html.Node[]): any[] {\n  const result: any[] = [];\n\n  nodes.forEach((ast, i) => {\n    const context: SiblingVisitorContext = {prev: nodes[i - 1], next: nodes[i + 1]};\n    const astResult = ast.visit(visitor, context);\n    if (astResult) {\n      result.push(astResult);\n    }\n  });\n  return result;\n}\n"]}