1 | /**
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2 | * @license
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3 | * Copyright Google LLC All Rights Reserved.
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4 | *
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5 | * Use of this source code is governed by an MIT-style license that can be
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6 | * found in the LICENSE file at https://angular.io/license
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7 | */
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8 | (function (factory) {
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9 | if (typeof module === "object" && typeof module.exports === "object") {
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10 | var v = factory(require, exports);
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11 | if (v !== undefined) module.exports = v;
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12 | }
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13 | else if (typeof define === "function" && define.amd) {
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14 | define("@angular/language-service/src/completions", ["require", "exports", "tslib", "@angular/compiler", "@angular/compiler/src/chars", "@angular/language-service/src/binding_utils", "@angular/language-service/src/expression_diagnostics", "@angular/language-service/src/expressions", "@angular/language-service/src/html_info", "@angular/language-service/src/template", "@angular/language-service/src/types", "@angular/language-service/src/utils"], factory);
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15 | }
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16 | })(function (require, exports) {
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17 | ;
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18 | Object.defineProperty(exports, "__esModule", { value: true });
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19 | exports.getTemplateCompletions = void 0;
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20 | var tslib_1 = require("tslib");
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21 | var compiler_1 = require("@angular/compiler");
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22 | var chars_1 = require("@angular/compiler/src/chars");
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23 | var binding_utils_1 = require("@angular/language-service/src/binding_utils");
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24 | var expression_diagnostics_1 = require("@angular/language-service/src/expression_diagnostics");
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25 | var expressions_1 = require("@angular/language-service/src/expressions");
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26 | var html_info_1 = require("@angular/language-service/src/html_info");
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27 | var template_1 = require("@angular/language-service/src/template");
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28 | var ng = require("@angular/language-service/src/types");
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29 | var utils_1 = require("@angular/language-service/src/utils");
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30 | var HIDDEN_HTML_ELEMENTS = new Set(['html', 'script', 'noscript', 'base', 'body', 'title', 'head', 'link']);
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31 | var HTML_ELEMENTS = html_info_1.elementNames().filter(function (name) { return !HIDDEN_HTML_ELEMENTS.has(name); }).map(function (name) {
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32 | return {
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33 | name: name,
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34 | kind: ng.CompletionKind.HTML_ELEMENT,
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35 | sortText: name,
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36 | };
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37 | });
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38 | var ANGULAR_ELEMENTS = [
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39 | {
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40 | name: 'ng-container',
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41 | kind: ng.CompletionKind.ANGULAR_ELEMENT,
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42 | sortText: 'ng-container',
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43 | },
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44 | {
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45 | name: 'ng-content',
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46 | kind: ng.CompletionKind.ANGULAR_ELEMENT,
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47 | sortText: 'ng-content',
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48 | },
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49 | {
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50 | name: 'ng-template',
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51 | kind: ng.CompletionKind.ANGULAR_ELEMENT,
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52 | sortText: 'ng-template',
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53 | },
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54 | ];
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55 | function isIdentifierPart(code) {
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56 | // Identifiers consist of alphanumeric characters, '_', or '$'.
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57 | return chars_1.isAsciiLetter(code) || chars_1.isDigit(code) || code == chars_1.$$ || code == chars_1.$_;
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58 | }
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59 | /**
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60 | * Gets the span of word in a template that surrounds `position`. If there is no word around
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61 | * `position`, nothing is returned.
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62 | */
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63 | function getBoundedWordSpan(templateInfo, position, ast) {
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64 | var template = templateInfo.template;
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65 | var templateSrc = template.source;
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66 | if (!templateSrc)
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67 | return;
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68 | if (ast instanceof compiler_1.Element) {
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69 | // The HTML tag may include `-` (e.g. `app-root`),
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70 | // so use the HtmlAst to get the span before ayazhafiz refactor the code.
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71 | return {
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72 | start: templateInfo.template.span.start + ast.startSourceSpan.start.offset + 1,
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73 | length: ast.name.length
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74 | };
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75 | }
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76 | // TODO(ayazhafiz): A solution based on word expansion will always be expensive compared to one
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77 | // based on ASTs. Whatever penalty we incur is probably manageable for small-length (i.e. the
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78 | // majority of) identifiers, but the current solution involes a number of branchings and we can't
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79 | // control potentially very long identifiers. Consider moving to an AST-based solution once
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80 | // existing difficulties with AST spans are more clearly resolved (see #31898 for discussion of
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81 | // known problems, and #33091 for how they affect text replacement).
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82 | //
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83 | // `templatePosition` represents the right-bound location of a cursor in the template.
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84 | // key.ent|ry
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85 | // ^---- cursor, at position `r` is at.
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86 | // A cursor is not itself a character in the template; it has a left (lower) and right (upper)
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87 | // index bound that hugs the cursor itself.
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88 | var templatePosition = position - template.span.start;
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89 | // To perform word expansion, we want to determine the left and right indices that hug the cursor.
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90 | // There are three cases here.
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91 | var left, right;
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92 | if (templatePosition === 0) {
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93 | // 1. Case like
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94 | // |rest of template
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95 | // the cursor is at the start of the template, hugged only by the right side (0-index).
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96 | left = right = 0;
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97 | }
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98 | else if (templatePosition === templateSrc.length) {
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99 | // 2. Case like
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100 | // rest of template|
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101 | // the cursor is at the end of the template, hugged only by the left side (last-index).
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102 | left = right = templateSrc.length - 1;
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103 | }
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104 | else {
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105 | // 3. Case like
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106 | // wo|rd
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107 | // there is a clear left and right index.
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108 | left = templatePosition - 1;
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109 | right = templatePosition;
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110 | }
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111 | if (!isIdentifierPart(templateSrc.charCodeAt(left)) &&
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112 | !isIdentifierPart(templateSrc.charCodeAt(right))) {
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113 | // Case like
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114 | // .|.
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115 | // left ---^ ^--- right
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116 | // There is no word here.
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117 | return;
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118 | }
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119 | // Expand on the left and right side until a word boundary is hit. Back up one expansion on both
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120 | // side to stay inside the word.
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121 | while (left >= 0 && isIdentifierPart(templateSrc.charCodeAt(left)))
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122 | --left;
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123 | ++left;
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124 | while (right < templateSrc.length && isIdentifierPart(templateSrc.charCodeAt(right)))
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125 | ++right;
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126 | --right;
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127 | var absoluteStartPosition = position - (templatePosition - left);
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128 | var length = right - left + 1;
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129 | return { start: absoluteStartPosition, length: length };
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130 | }
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131 | function getTemplateCompletions(templateInfo, position) {
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132 | var htmlAst = templateInfo.htmlAst, template = templateInfo.template;
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133 | // Calculate the position relative to the start of the template. This is needed
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134 | // because spans in HTML AST are relative. Inline template has non-zero start position.
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135 | var templatePosition = position - template.span.start;
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136 | var htmlPath = utils_1.getPathToNodeAtPosition(htmlAst, templatePosition);
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137 | var mostSpecific = htmlPath.tail;
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138 | var visitor = new HtmlVisitor(templateInfo, htmlPath);
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139 | var results = mostSpecific ?
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140 | mostSpecific.visit(visitor, null /* context */) :
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141 | elementCompletions(templateInfo);
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142 | var replacementSpan = getBoundedWordSpan(templateInfo, position, mostSpecific);
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143 | return results.map(function (entry) {
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144 | return tslib_1.__assign(tslib_1.__assign({}, entry), { replacementSpan: replacementSpan });
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145 | });
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146 | }
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147 | exports.getTemplateCompletions = getTemplateCompletions;
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148 | var HtmlVisitor = /** @class */ (function () {
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149 | function HtmlVisitor(templateInfo, htmlPath) {
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150 | this.templateInfo = templateInfo;
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151 | this.htmlPath = htmlPath;
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152 | this.relativePosition = htmlPath.position;
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153 | }
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154 | // Note that every visitor method must explicitly specify return type because
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155 | // Visitor returns `any` for all methods.
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156 | HtmlVisitor.prototype.visitElement = function (ast) {
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157 | var startTagSpan = utils_1.spanOf(ast.sourceSpan);
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158 | var tagLen = ast.name.length;
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159 | // + 1 for the opening angle bracket
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160 | if (this.relativePosition <= startTagSpan.start + tagLen + 1) {
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161 | // If we are in the tag then return the element completions.
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162 | return elementCompletions(this.templateInfo);
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163 | }
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164 | if (this.relativePosition < startTagSpan.end) {
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165 | // We are in the attribute section of the element (but not in an attribute).
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166 | // Return the attribute completions.
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167 | return attributeCompletionsForElement(this.templateInfo, ast.name);
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168 | }
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169 | return [];
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170 | };
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171 | HtmlVisitor.prototype.visitAttribute = function (ast) {
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172 | // An attribute consists of two parts, LHS="RHS".
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173 | // Determine if completions are requested for LHS or RHS
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174 | if (ast.valueSpan && utils_1.inSpan(this.relativePosition, utils_1.spanOf(ast.valueSpan))) {
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175 | // RHS completion
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176 | return attributeValueCompletions(this.templateInfo, this.htmlPath);
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177 | }
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178 | // LHS completion
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179 | return attributeCompletions(this.templateInfo, this.htmlPath);
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180 | };
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181 | HtmlVisitor.prototype.visitText = function () {
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182 | var _this = this;
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183 | var _a;
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184 | var templatePath = utils_1.findTemplateAstAt(this.templateInfo.templateAst, this.relativePosition);
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185 | if (templatePath.tail instanceof compiler_1.BoundTextAst) {
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186 | // If we know that this is an interpolation then do not try other scenarios.
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187 | var visitor = new ExpressionVisitor(this.templateInfo, this.relativePosition, function () {
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188 | return expression_diagnostics_1.getExpressionScope(utils_1.diagnosticInfoFromTemplateInfo(_this.templateInfo), templatePath);
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189 | });
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190 | (_a = templatePath.tail) === null || _a === void 0 ? void 0 : _a.visit(visitor, null);
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191 | return visitor.results;
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192 | }
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193 | // TODO(kyliau): Not sure if this check is really needed since we don't have
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194 | // any test cases for it.
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195 | var element = this.htmlPath.first(compiler_1.Element);
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196 | if (element &&
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197 | compiler_1.getHtmlTagDefinition(element.name).contentType !== compiler_1.TagContentType.PARSABLE_DATA) {
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198 | return [];
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199 | }
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200 | // This is to account for cases like <h1> <a> text | </h1> where the
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201 | // closest element has no closing tag and thus is considered plain text.
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202 | var results = voidElementAttributeCompletions(this.templateInfo, this.htmlPath);
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203 | if (results.length) {
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204 | return results;
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205 | }
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206 | return elementCompletions(this.templateInfo);
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207 | };
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208 | HtmlVisitor.prototype.visitComment = function () {
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209 | return [];
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210 | };
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211 | HtmlVisitor.prototype.visitExpansion = function () {
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212 | return [];
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213 | };
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214 | HtmlVisitor.prototype.visitExpansionCase = function () {
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215 | return [];
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216 | };
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217 | return HtmlVisitor;
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218 | }());
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219 | function attributeCompletions(info, path) {
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220 | var attr = path.tail;
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221 | var elem = path.parentOf(attr);
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222 | if (!(attr instanceof compiler_1.Attribute) || !(elem instanceof compiler_1.Element)) {
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223 | return [];
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224 | }
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225 | // TODO: Consider parsing the attrinute name to a proper AST instead of
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226 | // matching using regex. This is because the regexp would incorrectly identify
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227 | // bind parts for cases like [()|]
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228 | // ^ cursor is here
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229 | var binding = binding_utils_1.getBindingDescriptor(attr.name);
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230 | if (!binding) {
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231 | // This is a normal HTML attribute, not an Angular attribute.
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232 | return attributeCompletionsForElement(info, elem.name);
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233 | }
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234 | var results = [];
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235 | var ngAttrs = angularAttributes(info, elem.name);
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236 | switch (binding.kind) {
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237 | case binding_utils_1.ATTR.KW_MICROSYNTAX:
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238 | // template reference attribute: *attrName
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239 | results.push.apply(results, tslib_1.__spread(ngAttrs.templateRefs));
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240 | break;
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241 | case binding_utils_1.ATTR.KW_BIND:
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242 | case binding_utils_1.ATTR.IDENT_PROPERTY:
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243 | // property binding via bind- or []
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244 | results.push.apply(results, tslib_1.__spread(html_info_1.propertyNames(elem.name), ngAttrs.inputs));
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245 | break;
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246 | case binding_utils_1.ATTR.KW_ON:
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247 | case binding_utils_1.ATTR.IDENT_EVENT:
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248 | // event binding via on- or ()
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249 | results.push.apply(results, tslib_1.__spread(html_info_1.eventNames(elem.name), ngAttrs.outputs));
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250 | break;
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251 | case binding_utils_1.ATTR.KW_BINDON:
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252 | case binding_utils_1.ATTR.IDENT_BANANA_BOX:
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253 | // banana-in-a-box binding via bindon- or [()]
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254 | results.push.apply(results, tslib_1.__spread(ngAttrs.bananas));
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255 | break;
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256 | }
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257 | return results.map(function (name) {
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258 | return {
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259 | name: name,
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260 | kind: ng.CompletionKind.ATTRIBUTE,
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261 | sortText: name,
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262 | };
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263 | });
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264 | }
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265 | function attributeCompletionsForElement(info, elementName) {
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266 | var e_1, _a, e_2, _b;
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267 | var results = [];
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268 | if (info.template instanceof template_1.InlineTemplate) {
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269 | try {
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270 | // Provide HTML attributes completion only for inline templates
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271 | for (var _c = tslib_1.__values(html_info_1.attributeNames(elementName)), _d = _c.next(); !_d.done; _d = _c.next()) {
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272 | var name_1 = _d.value;
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273 | results.push({
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274 | name: name_1,
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275 | kind: ng.CompletionKind.HTML_ATTRIBUTE,
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276 | sortText: name_1,
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277 | });
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278 | }
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279 | }
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280 | catch (e_1_1) { e_1 = { error: e_1_1 }; }
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281 | finally {
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282 | try {
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283 | if (_d && !_d.done && (_a = _c.return)) _a.call(_c);
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284 | }
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285 | finally { if (e_1) throw e_1.error; }
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286 | }
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287 | }
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288 | // Add Angular attributes
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289 | var ngAttrs = angularAttributes(info, elementName);
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290 | try {
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291 | for (var _e = tslib_1.__values(ngAttrs.others), _f = _e.next(); !_f.done; _f = _e.next()) {
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292 | var name_2 = _f.value;
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293 | results.push({
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294 | name: name_2,
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295 | kind: ng.CompletionKind.ATTRIBUTE,
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296 | sortText: name_2,
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297 | });
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298 | }
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299 | }
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300 | catch (e_2_1) { e_2 = { error: e_2_1 }; }
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301 | finally {
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302 | try {
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303 | if (_f && !_f.done && (_b = _e.return)) _b.call(_e);
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304 | }
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305 | finally { if (e_2) throw e_2.error; }
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306 | }
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307 | return results;
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308 | }
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309 | /**
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310 | * Provide completions to the RHS of an attribute, which is of the form
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311 | * LHS="RHS". The template path is computed from the specified `info` whereas
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312 | * the context is determined from the specified `htmlPath`.
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313 | * @param info Object that contains the template AST
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314 | * @param htmlPath Path to the HTML node
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315 | */
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316 | function attributeValueCompletions(info, htmlPath) {
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317 | // Find the corresponding Template AST path.
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318 | var templatePath = utils_1.findTemplateAstAt(info.templateAst, htmlPath.position);
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319 | var visitor = new ExpressionVisitor(info, htmlPath.position, function () {
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320 | var dinfo = utils_1.diagnosticInfoFromTemplateInfo(info);
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321 | return expression_diagnostics_1.getExpressionScope(dinfo, templatePath);
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322 | });
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323 | if (templatePath.tail instanceof compiler_1.AttrAst ||
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324 | templatePath.tail instanceof compiler_1.BoundElementPropertyAst ||
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325 | templatePath.tail instanceof compiler_1.BoundEventAst) {
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326 | templatePath.tail.visit(visitor, null);
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327 | return visitor.results;
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328 | }
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329 | // In order to provide accurate attribute value completion, we need to know
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330 | // what the LHS is, and construct the proper AST if it is missing.
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331 | var htmlAttr = htmlPath.tail;
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332 | var binding = binding_utils_1.getBindingDescriptor(htmlAttr.name);
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333 | if (binding && binding.kind === binding_utils_1.ATTR.KW_REF) {
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334 | var refAst = void 0;
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335 | var elemAst = void 0;
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336 | if (templatePath.tail instanceof compiler_1.ReferenceAst) {
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337 | refAst = templatePath.tail;
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338 | var parent_1 = templatePath.parentOf(refAst);
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339 | if (parent_1 instanceof compiler_1.ElementAst) {
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340 | elemAst = parent_1;
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341 | }
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342 | }
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343 | else if (templatePath.tail instanceof compiler_1.ElementAst) {
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344 | refAst = new compiler_1.ReferenceAst(htmlAttr.name, null, htmlAttr.value, htmlAttr.valueSpan);
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345 | elemAst = templatePath.tail;
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346 | }
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347 | if (refAst && elemAst) {
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348 | refAst.visit(visitor, elemAst);
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349 | }
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350 | }
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351 | else {
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352 | // HtmlAst contains the `Attribute` node, however the corresponding `AttrAst`
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353 | // node is missing from the TemplateAst.
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354 | var attrAst = new compiler_1.AttrAst(htmlAttr.name, htmlAttr.value, htmlAttr.valueSpan);
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355 | attrAst.visit(visitor, null);
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356 | }
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357 | return visitor.results;
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358 | }
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359 | function elementCompletions(info) {
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360 | var e_3, _a;
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361 | var results = tslib_1.__spread(ANGULAR_ELEMENTS);
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362 | if (info.template instanceof template_1.InlineTemplate) {
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363 | // Provide HTML elements completion only for inline templates
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364 | results.push.apply(results, tslib_1.__spread(HTML_ELEMENTS));
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365 | }
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366 | // Collect the elements referenced by the selectors
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367 | var components = new Set();
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368 | try {
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369 | for (var _b = tslib_1.__values(utils_1.getSelectors(info).selectors), _c = _b.next(); !_c.done; _c = _b.next()) {
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370 | var selector = _c.value;
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371 | var name_3 = selector.element;
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372 | if (name_3 && !components.has(name_3)) {
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373 | components.add(name_3);
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374 | results.push({
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375 | name: name_3,
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376 | kind: ng.CompletionKind.COMPONENT,
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377 | sortText: name_3,
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378 | });
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379 | }
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380 | }
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381 | }
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382 | catch (e_3_1) { e_3 = { error: e_3_1 }; }
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383 | finally {
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384 | try {
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385 | if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
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386 | }
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387 | finally { if (e_3) throw e_3.error; }
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388 | }
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389 | return results;
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390 | }
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391 | // There is a special case of HTML where text that contains a unclosed tag is treated as
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392 | // text. For exaple '<h1> Some <a text </h1>' produces a text nodes inside of the H1
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393 | // element "Some <a text". We, however, want to treat this as if the user was requesting
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394 | // the attributes of an "a" element, not requesting completion in the a text element. This
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395 | // code checks for this case and returns element completions if it is detected or undefined
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396 | // if it is not.
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397 | function voidElementAttributeCompletions(info, path) {
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398 | var tail = path.tail;
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399 | if (tail instanceof compiler_1.Text) {
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400 | var match = tail.value.match(/<(\w(\w|\d|-)*:)?(\w(\w|\d|-)*)\s/);
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401 | // The position must be after the match, otherwise we are still in a place where elements
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402 | // are expected (such as `<|a` or `<a|`; we only want attributes for `<a |` or after).
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403 | if (match &&
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404 | path.position >= (match.index || 0) + match[0].length + tail.sourceSpan.start.offset) {
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405 | return attributeCompletionsForElement(info, match[3]);
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406 | }
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407 | }
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408 | return [];
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409 | }
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410 | var ExpressionVisitor = /** @class */ (function (_super) {
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411 | tslib_1.__extends(ExpressionVisitor, _super);
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412 | function ExpressionVisitor(info, position, getExpressionScope) {
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413 | var _this = _super.call(this) || this;
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414 | _this.info = info;
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415 | _this.position = position;
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416 | _this.getExpressionScope = getExpressionScope;
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417 | _this.completions = new Map();
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418 | return _this;
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419 | }
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420 | Object.defineProperty(ExpressionVisitor.prototype, "results", {
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421 | get: function () {
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422 | return Array.from(this.completions.values());
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423 | },
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424 | enumerable: false,
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425 | configurable: true
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426 | });
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427 | ExpressionVisitor.prototype.visitDirectiveProperty = function (ast) {
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428 | this.processExpressionCompletions(ast.value);
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429 | };
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430 | ExpressionVisitor.prototype.visitElementProperty = function (ast) {
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431 | this.processExpressionCompletions(ast.value);
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432 | };
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433 | ExpressionVisitor.prototype.visitEvent = function (ast) {
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434 | this.processExpressionCompletions(ast.handler);
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435 | };
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436 | ExpressionVisitor.prototype.visitElement = function () {
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437 | // no-op for now
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438 | };
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439 | ExpressionVisitor.prototype.visitAttr = function (ast) {
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440 | var binding = binding_utils_1.getBindingDescriptor(ast.name);
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441 | if (binding && binding.kind === binding_utils_1.ATTR.KW_MICROSYNTAX) {
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442 | // This a template binding given by micro syntax expression.
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443 | // First, verify the attribute consists of some binding we can give completions for.
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444 | // The sourceSpan of AttrAst points to the RHS of the attribute
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445 | var templateKey = binding.name;
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446 | var templateValue = ast.sourceSpan.toString();
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447 | var templateUrl = ast.sourceSpan.start.file.url;
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448 | // TODO(kyliau): We are unable to determine the absolute offset of the key
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449 | // but it is okay here, because we are only looking at the RHS of the attr
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450 | var absKeyOffset = 0;
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451 | var absValueOffset = ast.sourceSpan.start.offset;
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452 | var templateBindings = this.info.expressionParser.parseTemplateBindings(templateKey, templateValue, templateUrl, absKeyOffset, absValueOffset).templateBindings;
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453 | // Find the nearest template binding to the position.
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454 | var lastBindingEnd = templateBindings.length > 0 &&
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455 | templateBindings[templateBindings.length - 1].sourceSpan.end;
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456 | var normalizedPositionToBinding_1 = lastBindingEnd && this.position > lastBindingEnd ? lastBindingEnd : this.position;
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457 | var templateBinding = templateBindings.find(function (b) { return utils_1.inSpan(normalizedPositionToBinding_1, b.sourceSpan); });
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458 | if (!templateBinding) {
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459 | return;
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460 | }
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461 | this.microSyntaxInAttributeValue(ast, templateBinding);
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462 | }
|
463 | else {
|
464 | var expressionAst = this.info.expressionParser.parseBinding(ast.value, ast.sourceSpan.toString(), ast.sourceSpan.start.offset);
|
465 | this.processExpressionCompletions(expressionAst);
|
466 | }
|
467 | };
|
468 | ExpressionVisitor.prototype.visitReference = function (_ast, context) {
|
469 | var _this = this;
|
470 | context.directives.forEach(function (dir) {
|
471 | var exportAs = dir.directive.exportAs;
|
472 | if (exportAs) {
|
473 | _this.completions.set(exportAs, { name: exportAs, kind: ng.CompletionKind.REFERENCE, sortText: exportAs });
|
474 | }
|
475 | });
|
476 | };
|
477 | ExpressionVisitor.prototype.visitBoundText = function (ast) {
|
478 | if (utils_1.inSpan(this.position, ast.value.sourceSpan)) {
|
479 | var completions = expressions_1.getExpressionCompletions(this.getExpressionScope(), ast.value, this.position, this.info.template);
|
480 | if (completions) {
|
481 | this.addSymbolsToCompletions(completions);
|
482 | }
|
483 | }
|
484 | };
|
485 | ExpressionVisitor.prototype.processExpressionCompletions = function (value) {
|
486 | var symbols = expressions_1.getExpressionCompletions(this.getExpressionScope(), value, this.position, this.info.template);
|
487 | if (symbols) {
|
488 | this.addSymbolsToCompletions(symbols);
|
489 | }
|
490 | };
|
491 | ExpressionVisitor.prototype.addSymbolsToCompletions = function (symbols) {
|
492 | var e_4, _a;
|
493 | try {
|
494 | for (var symbols_1 = tslib_1.__values(symbols), symbols_1_1 = symbols_1.next(); !symbols_1_1.done; symbols_1_1 = symbols_1.next()) {
|
495 | var s = symbols_1_1.value;
|
496 | if (s.name.startsWith('__') || !s.public || this.completions.has(s.name)) {
|
497 | continue;
|
498 | }
|
499 | // The pipe method should not include parentheses.
|
500 | // e.g. {{ value_expression | slice : start [ : end ] }}
|
501 | var shouldInsertParentheses = s.callable && s.kind !== ng.CompletionKind.PIPE;
|
502 | this.completions.set(s.name, {
|
503 | name: s.name,
|
504 | kind: s.kind,
|
505 | sortText: s.name,
|
506 | insertText: shouldInsertParentheses ? s.name + "()" : s.name,
|
507 | });
|
508 | }
|
509 | }
|
510 | catch (e_4_1) { e_4 = { error: e_4_1 }; }
|
511 | finally {
|
512 | try {
|
513 | if (symbols_1_1 && !symbols_1_1.done && (_a = symbols_1.return)) _a.call(symbols_1);
|
514 | }
|
515 | finally { if (e_4) throw e_4.error; }
|
516 | }
|
517 | };
|
518 | /**
|
519 | * This method handles the completions of attribute values for directives that
|
520 | * support the microsyntax format. Examples are *ngFor and *ngIf.
|
521 | * These directives allows declaration of "let" variables, adds context-specific
|
522 | * symbols like $implicit, index, count, among other behaviors.
|
523 | * For a complete description of such format, see
|
524 | * https://angular.io/guide/structural-directives#the-asterisk--prefix
|
525 | *
|
526 | * @param attr descriptor for attribute name and value pair
|
527 | * @param binding template binding for the expression in the attribute
|
528 | */
|
529 | ExpressionVisitor.prototype.microSyntaxInAttributeValue = function (attr, binding) {
|
530 | var _a;
|
531 | var key = attr.name.substring(1); // remove leading asterisk
|
532 | // Find the selector - eg ngFor, ngIf, etc
|
533 | var selectorInfo = utils_1.getSelectors(this.info);
|
534 | var selector = selectorInfo.selectors.find(function (s) {
|
535 | // attributes are listed in (attribute, value) pairs
|
536 | for (var i = 0; i < s.attrs.length; i += 2) {
|
537 | if (s.attrs[i] === key) {
|
538 | return true;
|
539 | }
|
540 | }
|
541 | });
|
542 | if (!selector) {
|
543 | return;
|
544 | }
|
545 | var valueRelativePosition = this.position - attr.sourceSpan.start.offset;
|
546 | if (binding instanceof compiler_1.VariableBinding) {
|
547 | // TODO(kyliau): With expression sourceSpan we shouldn't have to search
|
548 | // the attribute value string anymore. Just check if position is in the
|
549 | // expression source span.
|
550 | var equalLocation = attr.value.indexOf('=');
|
551 | if (equalLocation > 0 && valueRelativePosition > equalLocation) {
|
552 | // We are after the '=' in a let clause. The valid values here are the members of the
|
553 | // template reference's type parameter.
|
554 | var directiveMetadata = selectorInfo.map.get(selector);
|
555 | if (directiveMetadata) {
|
556 | var contextTable = this.info.template.query.getTemplateContext(directiveMetadata.type.reference);
|
557 | if (contextTable) {
|
558 | // This adds symbols like $implicit, index, count, etc.
|
559 | this.addSymbolsToCompletions(contextTable.values());
|
560 | return;
|
561 | }
|
562 | }
|
563 | }
|
564 | }
|
565 | else if (binding instanceof compiler_1.ExpressionBinding) {
|
566 | if (utils_1.inSpan(this.position, (_a = binding.value) === null || _a === void 0 ? void 0 : _a.ast.sourceSpan)) {
|
567 | this.processExpressionCompletions(binding.value.ast);
|
568 | return;
|
569 | }
|
570 | else if (!binding.value && this.position > binding.key.span.end) {
|
571 | // No expression is defined for the value of the key expression binding, but the cursor is
|
572 | // in a location where the expression would be defined. This can happen in a case like
|
573 | // let i of |
|
574 | // ^-- cursor
|
575 | // In this case, backfill the value to be an empty expression and retrieve completions.
|
576 | this.processExpressionCompletions(new compiler_1.EmptyExpr(new compiler_1.ParseSpan(valueRelativePosition, valueRelativePosition), new compiler_1.AbsoluteSourceSpan(this.position, this.position)));
|
577 | return;
|
578 | }
|
579 | }
|
580 | };
|
581 | return ExpressionVisitor;
|
582 | }(compiler_1.NullTemplateVisitor));
|
583 | /**
|
584 | * Return all Angular-specific attributes for the element with `elementName`.
|
585 | * @param info
|
586 | * @param elementName
|
587 | */
|
588 | function angularAttributes(info, elementName) {
|
589 | var e_5, _a, e_6, _b, e_7, _c, e_8, _d;
|
590 | var _e = utils_1.getSelectors(info), selectors = _e.selectors, selectorMap = _e.map;
|
591 | var templateRefs = new Set();
|
592 | var inputs = new Set();
|
593 | var outputs = new Set();
|
594 | var bananas = new Set();
|
595 | var others = new Set();
|
596 | try {
|
597 | for (var selectors_1 = tslib_1.__values(selectors), selectors_1_1 = selectors_1.next(); !selectors_1_1.done; selectors_1_1 = selectors_1.next()) {
|
598 | var selector = selectors_1_1.value;
|
599 | if (selector.element && selector.element !== elementName) {
|
600 | continue;
|
601 | }
|
602 | var summary = selectorMap.get(selector);
|
603 | var hasTemplateRef = utils_1.isStructuralDirective(summary.type);
|
604 | // attributes are listed in (attribute, value) pairs
|
605 | for (var i = 0; i < selector.attrs.length; i += 2) {
|
606 | var attr = selector.attrs[i];
|
607 | if (hasTemplateRef) {
|
608 | templateRefs.add(attr);
|
609 | }
|
610 | else {
|
611 | others.add(attr);
|
612 | }
|
613 | }
|
614 | try {
|
615 | for (var _f = (e_6 = void 0, tslib_1.__values(Object.values(summary.inputs))), _g = _f.next(); !_g.done; _g = _f.next()) {
|
616 | var input = _g.value;
|
617 | inputs.add(input);
|
618 | }
|
619 | }
|
620 | catch (e_6_1) { e_6 = { error: e_6_1 }; }
|
621 | finally {
|
622 | try {
|
623 | if (_g && !_g.done && (_b = _f.return)) _b.call(_f);
|
624 | }
|
625 | finally { if (e_6) throw e_6.error; }
|
626 | }
|
627 | try {
|
628 | for (var _h = (e_7 = void 0, tslib_1.__values(Object.values(summary.outputs))), _j = _h.next(); !_j.done; _j = _h.next()) {
|
629 | var output = _j.value;
|
630 | outputs.add(output);
|
631 | }
|
632 | }
|
633 | catch (e_7_1) { e_7 = { error: e_7_1 }; }
|
634 | finally {
|
635 | try {
|
636 | if (_j && !_j.done && (_c = _h.return)) _c.call(_h);
|
637 | }
|
638 | finally { if (e_7) throw e_7.error; }
|
639 | }
|
640 | }
|
641 | }
|
642 | catch (e_5_1) { e_5 = { error: e_5_1 }; }
|
643 | finally {
|
644 | try {
|
645 | if (selectors_1_1 && !selectors_1_1.done && (_a = selectors_1.return)) _a.call(selectors_1);
|
646 | }
|
647 | finally { if (e_5) throw e_5.error; }
|
648 | }
|
649 | try {
|
650 | for (var inputs_1 = tslib_1.__values(inputs), inputs_1_1 = inputs_1.next(); !inputs_1_1.done; inputs_1_1 = inputs_1.next()) {
|
651 | var name_4 = inputs_1_1.value;
|
652 | // Add banana-in-a-box syntax
|
653 | // https://angular.io/guide/template-syntax#two-way-binding-
|
654 | if (outputs.has(name_4 + "Change")) {
|
655 | bananas.add(name_4);
|
656 | }
|
657 | }
|
658 | }
|
659 | catch (e_8_1) { e_8 = { error: e_8_1 }; }
|
660 | finally {
|
661 | try {
|
662 | if (inputs_1_1 && !inputs_1_1.done && (_d = inputs_1.return)) _d.call(inputs_1);
|
663 | }
|
664 | finally { if (e_8) throw e_8.error; }
|
665 | }
|
666 | return { templateRefs: templateRefs, inputs: inputs, outputs: outputs, bananas: bananas, others: others };
|
667 | }
|
668 | });
|
669 | //# 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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 {AbsoluteSourceSpan, AST, AstPath, AttrAst, Attribute, BoundDirectivePropertyAst, BoundElementPropertyAst, BoundEventAst, BoundTextAst, Element, ElementAst, EmptyExpr, ExpressionBinding, getHtmlTagDefinition, HtmlAstPath, Node as HtmlAst, NullTemplateVisitor, ParseSpan, ReferenceAst, TagContentType, TemplateBinding, Text, VariableBinding, Visitor} from '@angular/compiler';\nimport {$$, $_, isAsciiLetter, isDigit} from '@angular/compiler/src/chars';\n\nimport {ATTR, getBindingDescriptor} from './binding_utils';\nimport {getExpressionScope} from './expression_diagnostics';\nimport {getExpressionCompletions} from './expressions';\nimport {attributeNames, elementNames, eventNames, propertyNames} from './html_info';\nimport {InlineTemplate} from './template';\nimport * as ng from './types';\nimport {diagnosticInfoFromTemplateInfo, findTemplateAstAt, getPathToNodeAtPosition, getSelectors, inSpan, isStructuralDirective, spanOf} from './utils';\n\nconst HIDDEN_HTML_ELEMENTS: ReadonlySet<string> =\n    new Set(['html', 'script', 'noscript', 'base', 'body', 'title', 'head', 'link']);\nconst HTML_ELEMENTS: ReadonlyArray<ng.CompletionEntry> =\n    elementNames().filter(name => !HIDDEN_HTML_ELEMENTS.has(name)).map(name => {\n      return {\n        name,\n        kind: ng.CompletionKind.HTML_ELEMENT,\n        sortText: name,\n      };\n    });\nconst ANGULAR_ELEMENTS: ReadonlyArray<ng.CompletionEntry> = [\n  {\n    name: 'ng-container',\n    kind: ng.CompletionKind.ANGULAR_ELEMENT,\n    sortText: 'ng-container',\n  },\n  {\n    name: 'ng-content',\n    kind: ng.CompletionKind.ANGULAR_ELEMENT,\n    sortText: 'ng-content',\n  },\n  {\n    name: 'ng-template',\n    kind: ng.CompletionKind.ANGULAR_ELEMENT,\n    sortText: 'ng-template',\n  },\n];\n\nfunction isIdentifierPart(code: number) {\n  // Identifiers consist of alphanumeric characters, '_', or '$'.\n  return isAsciiLetter(code) || isDigit(code) || code == $$ || code == $_;\n}\n\n/**\n * Gets the span of word in a template that surrounds `position`. If there is no word around\n * `position`, nothing is returned.\n */\nfunction getBoundedWordSpan(\n    templateInfo: ng.AstResult, position: number, ast: HtmlAst|undefined): ts.TextSpan|undefined {\n  const {template} = templateInfo;\n  const templateSrc = template.source;\n\n  if (!templateSrc) return;\n\n  if (ast instanceof Element) {\n    // The HTML tag may include `-` (e.g. `app-root`),\n    // so use the HtmlAst to get the span before ayazhafiz refactor the code.\n    return {\n      start: templateInfo.template.span.start + ast.startSourceSpan.start.offset + 1,\n      length: ast.name.length\n    };\n  }\n\n  // TODO(ayazhafiz): A solution based on word expansion will always be expensive compared to one\n  // based on ASTs. Whatever penalty we incur is probably manageable for small-length (i.e. the\n  // majority of) identifiers, but the current solution involes a number of branchings and we can't\n  // control potentially very long identifiers. Consider moving to an AST-based solution once\n  // existing difficulties with AST spans are more clearly resolved (see #31898 for discussion of\n  // known problems, and #33091 for how they affect text replacement).\n  //\n  // `templatePosition` represents the right-bound location of a cursor in the template.\n  //    key.ent|ry\n  //           ^---- cursor, at position `r` is at.\n  // A cursor is not itself a character in the template; it has a left (lower) and right (upper)\n  // index bound that hugs the cursor itself.\n  let templatePosition = position - template.span.start;\n  // To perform word expansion, we want to determine the left and right indices that hug the cursor.\n  // There are three cases here.\n  let left, right;\n  if (templatePosition === 0) {\n    // 1. Case like\n    //      |rest of template\n    //    the cursor is at the start of the template, hugged only by the right side (0-index).\n    left = right = 0;\n  } else if (templatePosition === templateSrc.length) {\n    // 2. Case like\n    //      rest of template|\n    //    the cursor is at the end of the template, hugged only by the left side (last-index).\n    left = right = templateSrc.length - 1;\n  } else {\n    // 3. Case like\n    //      wo|rd\n    //    there is a clear left and right index.\n    left = templatePosition - 1;\n    right = templatePosition;\n  }\n\n  if (!isIdentifierPart(templateSrc.charCodeAt(left)) &&\n      !isIdentifierPart(templateSrc.charCodeAt(right))) {\n    // Case like\n    //         .|.\n    // left ---^ ^--- right\n    // There is no word here.\n    return;\n  }\n\n  // Expand on the left and right side until a word boundary is hit. Back up one expansion on both\n  // side to stay inside the word.\n  while (left >= 0 && isIdentifierPart(templateSrc.charCodeAt(left))) --left;\n  ++left;\n  while (right < templateSrc.length && isIdentifierPart(templateSrc.charCodeAt(right))) ++right;\n  --right;\n\n  const absoluteStartPosition = position - (templatePosition - left);\n  const length = right - left + 1;\n  return {start: absoluteStartPosition, length};\n}\n\nexport function getTemplateCompletions(\n    templateInfo: ng.AstResult, position: number): ng.CompletionEntry[] {\n  const {htmlAst, template} = templateInfo;\n  // Calculate the position relative to the start of the template. This is needed\n  // because spans in HTML AST are relative. Inline template has non-zero start position.\n  const templatePosition = position - template.span.start;\n  const htmlPath: HtmlAstPath = getPathToNodeAtPosition(htmlAst, templatePosition);\n  const mostSpecific = htmlPath.tail;\n  const visitor = new HtmlVisitor(templateInfo, htmlPath);\n  const results: ng.CompletionEntry[] = mostSpecific ?\n      mostSpecific.visit(visitor, null /* context */) :\n      elementCompletions(templateInfo);\n  const replacementSpan = getBoundedWordSpan(templateInfo, position, mostSpecific);\n  return results.map(entry => {\n    return {\n      ...entry,\n      replacementSpan,\n    };\n  });\n}\n\nclass HtmlVisitor implements Visitor {\n  /**\n   * Position relative to the start of the template.\n   */\n  private readonly relativePosition: number;\n  constructor(private readonly templateInfo: ng.AstResult, private readonly htmlPath: HtmlAstPath) {\n    this.relativePosition = htmlPath.position;\n  }\n  // Note that every visitor method must explicitly specify return type because\n  // Visitor returns `any` for all methods.\n  visitElement(ast: Element): ng.CompletionEntry[] {\n    const startTagSpan = spanOf(ast.sourceSpan);\n    const tagLen = ast.name.length;\n    // + 1 for the opening angle bracket\n    if (this.relativePosition <= startTagSpan.start + tagLen + 1) {\n      // If we are in the tag then return the element completions.\n      return elementCompletions(this.templateInfo);\n    }\n    if (this.relativePosition < startTagSpan.end) {\n      // We are in the attribute section of the element (but not in an attribute).\n      // Return the attribute completions.\n      return attributeCompletionsForElement(this.templateInfo, ast.name);\n    }\n    return [];\n  }\n  visitAttribute(ast: Attribute): ng.CompletionEntry[] {\n    // An attribute consists of two parts, LHS=\"RHS\".\n    // Determine if completions are requested for LHS or RHS\n    if (ast.valueSpan && inSpan(this.relativePosition, spanOf(ast.valueSpan))) {\n      // RHS completion\n      return attributeValueCompletions(this.templateInfo, this.htmlPath);\n    }\n    // LHS completion\n    return attributeCompletions(this.templateInfo, this.htmlPath);\n  }\n  visitText(): ng.CompletionEntry[] {\n    const templatePath = findTemplateAstAt(this.templateInfo.templateAst, this.relativePosition);\n    if (templatePath.tail instanceof BoundTextAst) {\n      // If we know that this is an interpolation then do not try other scenarios.\n      const visitor = new ExpressionVisitor(\n          this.templateInfo, this.relativePosition,\n          () =>\n              getExpressionScope(diagnosticInfoFromTemplateInfo(this.templateInfo), templatePath));\n      templatePath.tail?.visit(visitor, null);\n      return visitor.results;\n    }\n    // TODO(kyliau): Not sure if this check is really needed since we don't have\n    // any test cases for it.\n    const element = this.htmlPath.first(Element);\n    if (element &&\n        getHtmlTagDefinition(element.name).contentType !== TagContentType.PARSABLE_DATA) {\n      return [];\n    }\n    // This is to account for cases like <h1> <a> text | </h1> where the\n    // closest element has no closing tag and thus is considered plain text.\n    const results = voidElementAttributeCompletions(this.templateInfo, this.htmlPath);\n    if (results.length) {\n      return results;\n    }\n    return elementCompletions(this.templateInfo);\n  }\n  visitComment(): ng.CompletionEntry[] {\n    return [];\n  }\n  visitExpansion(): ng.CompletionEntry[] {\n    return [];\n  }\n  visitExpansionCase(): ng.CompletionEntry[] {\n    return [];\n  }\n}\n\nfunction attributeCompletions(info: ng.AstResult, path: AstPath<HtmlAst>): ng.CompletionEntry[] {\n  const attr = path.tail;\n  const elem = path.parentOf(attr);\n  if (!(attr instanceof Attribute) || !(elem instanceof Element)) {\n    return [];\n  }\n\n  // TODO: Consider parsing the attrinute name to a proper AST instead of\n  // matching using regex. This is because the regexp would incorrectly identify\n  // bind parts for cases like [()|]\n  //                              ^ cursor is here\n  const binding = getBindingDescriptor(attr.name);\n  if (!binding) {\n    // This is a normal HTML attribute, not an Angular attribute.\n    return attributeCompletionsForElement(info, elem.name);\n  }\n\n  const results: string[] = [];\n  const ngAttrs = angularAttributes(info, elem.name);\n  switch (binding.kind) {\n    case ATTR.KW_MICROSYNTAX:\n      // template reference attribute: *attrName\n      results.push(...ngAttrs.templateRefs);\n      break;\n\n    case ATTR.KW_BIND:\n    case ATTR.IDENT_PROPERTY:\n      // property binding via bind- or []\n      results.push(...propertyNames(elem.name), ...ngAttrs.inputs);\n      break;\n\n    case ATTR.KW_ON:\n    case ATTR.IDENT_EVENT:\n      // event binding via on- or ()\n      results.push(...eventNames(elem.name), ...ngAttrs.outputs);\n      break;\n\n    case ATTR.KW_BINDON:\n    case ATTR.IDENT_BANANA_BOX:\n      // banana-in-a-box binding via bindon- or [()]\n      results.push(...ngAttrs.bananas);\n      break;\n  }\n\n  return results.map(name => {\n    return {\n      name,\n      kind: ng.CompletionKind.ATTRIBUTE,\n      sortText: name,\n    };\n  });\n}\n\nfunction attributeCompletionsForElement(\n    info: ng.AstResult, elementName: string): ng.CompletionEntry[] {\n  const results: ng.CompletionEntry[] = [];\n\n  if (info.template instanceof InlineTemplate) {\n    // Provide HTML attributes completion only for inline templates\n    for (const name of attributeNames(elementName)) {\n      results.push({\n        name,\n        kind: ng.CompletionKind.HTML_ATTRIBUTE,\n        sortText: name,\n      });\n    }\n  }\n\n  // Add Angular attributes\n  const ngAttrs = angularAttributes(info, elementName);\n  for (const name of ngAttrs.others) {\n    results.push({\n      name,\n      kind: ng.CompletionKind.ATTRIBUTE,\n      sortText: name,\n    });\n  }\n\n  return results;\n}\n\n/**\n * Provide completions to the RHS of an attribute, which is of the form\n * LHS=\"RHS\". The template path is computed from the specified `info` whereas\n * the context is determined from the specified `htmlPath`.\n * @param info Object that contains the template AST\n * @param htmlPath Path to the HTML node\n */\nfunction attributeValueCompletions(\n    info: ng.AstResult, htmlPath: HtmlAstPath): ng.CompletionEntry[] {\n  // Find the corresponding Template AST path.\n  const templatePath = findTemplateAstAt(info.templateAst, htmlPath.position);\n  const visitor = new ExpressionVisitor(info, htmlPath.position, () => {\n    const dinfo = diagnosticInfoFromTemplateInfo(info);\n    return getExpressionScope(dinfo, templatePath);\n  });\n  if (templatePath.tail instanceof AttrAst ||\n      templatePath.tail instanceof BoundElementPropertyAst ||\n      templatePath.tail instanceof BoundEventAst) {\n    templatePath.tail.visit(visitor, null);\n    return visitor.results;\n  }\n  // In order to provide accurate attribute value completion, we need to know\n  // what the LHS is, and construct the proper AST if it is missing.\n  const htmlAttr = htmlPath.tail as Attribute;\n  const binding = getBindingDescriptor(htmlAttr.name);\n  if (binding && binding.kind === ATTR.KW_REF) {\n    let refAst: ReferenceAst|undefined;\n    let elemAst: ElementAst|undefined;\n    if (templatePath.tail instanceof ReferenceAst) {\n      refAst = templatePath.tail;\n      const parent = templatePath.parentOf(refAst);\n      if (parent instanceof ElementAst) {\n        elemAst = parent;\n      }\n    } else if (templatePath.tail instanceof ElementAst) {\n      refAst = new ReferenceAst(htmlAttr.name, null!, htmlAttr.value, htmlAttr.valueSpan!);\n      elemAst = templatePath.tail;\n    }\n    if (refAst && elemAst) {\n      refAst.visit(visitor, elemAst);\n    }\n  } else {\n    // HtmlAst contains the `Attribute` node, however the corresponding `AttrAst`\n    // node is missing from the TemplateAst.\n    const attrAst = new AttrAst(htmlAttr.name, htmlAttr.value, htmlAttr.valueSpan!);\n    attrAst.visit(visitor, null);\n  }\n  return visitor.results;\n}\n\nfunction elementCompletions(info: ng.AstResult): ng.CompletionEntry[] {\n  const results: ng.CompletionEntry[] = [...ANGULAR_ELEMENTS];\n\n  if (info.template instanceof InlineTemplate) {\n    // Provide HTML elements completion only for inline templates\n    results.push(...HTML_ELEMENTS);\n  }\n\n  // Collect the elements referenced by the selectors\n  const components = new Set<string>();\n  for (const selector of getSelectors(info).selectors) {\n    const name = selector.element;\n    if (name && !components.has(name)) {\n      components.add(name);\n      results.push({\n        name,\n        kind: ng.CompletionKind.COMPONENT,\n        sortText: name,\n      });\n    }\n  }\n\n  return results;\n}\n\n// There is a special case of HTML where text that contains a unclosed tag is treated as\n// text. For exaple '<h1> Some <a text </h1>' produces a text nodes inside of the H1\n// element \"Some <a text\". We, however, want to treat this as if the user was requesting\n// the attributes of an \"a\" element, not requesting completion in the a text element. This\n// code checks for this case and returns element completions if it is detected or undefined\n// if it is not.\nfunction voidElementAttributeCompletions(\n    info: ng.AstResult, path: AstPath<HtmlAst>): ng.CompletionEntry[] {\n  const tail = path.tail;\n  if (tail instanceof Text) {\n    const match = tail.value.match(/<(\\w(\\w|\\d|-)*:)?(\\w(\\w|\\d|-)*)\\s/);\n    // The position must be after the match, otherwise we are still in a place where elements\n    // are expected (such as `<|a` or `<a|`; we only want attributes for `<a |` or after).\n    if (match &&\n        path.position >= (match.index || 0) + match[0].length + tail.sourceSpan.start.offset) {\n      return attributeCompletionsForElement(info, match[3]);\n    }\n  }\n  return [];\n}\n\nclass ExpressionVisitor extends NullTemplateVisitor {\n  private readonly completions = new Map<string, ng.CompletionEntry>();\n\n  constructor(\n      private readonly info: ng.AstResult, private readonly position: number,\n      private readonly getExpressionScope: () => ng.SymbolTable) {\n    super();\n  }\n\n  get results(): ng.CompletionEntry[] {\n    return Array.from(this.completions.values());\n  }\n\n  visitDirectiveProperty(ast: BoundDirectivePropertyAst): void {\n    this.processExpressionCompletions(ast.value);\n  }\n\n  visitElementProperty(ast: BoundElementPropertyAst): void {\n    this.processExpressionCompletions(ast.value);\n  }\n\n  visitEvent(ast: BoundEventAst): void {\n    this.processExpressionCompletions(ast.handler);\n  }\n\n  visitElement(): void {\n    // no-op for now\n  }\n\n  visitAttr(ast: AttrAst) {\n    const binding = getBindingDescriptor(ast.name);\n    if (binding && binding.kind === ATTR.KW_MICROSYNTAX) {\n      // This a template binding given by micro syntax expression.\n      // First, verify the attribute consists of some binding we can give completions for.\n      // The sourceSpan of AttrAst points to the RHS of the attribute\n      const templateKey = binding.name;\n      const templateValue = ast.sourceSpan.toString();\n      const templateUrl = ast.sourceSpan.start.file.url;\n      // TODO(kyliau): We are unable to determine the absolute offset of the key\n      // but it is okay here, because we are only looking at the RHS of the attr\n      const absKeyOffset = 0;\n      const absValueOffset = ast.sourceSpan.start.offset;\n      const {templateBindings} = this.info.expressionParser.parseTemplateBindings(\n          templateKey, templateValue, templateUrl, absKeyOffset, absValueOffset);\n      // Find the nearest template binding to the position.\n      const lastBindingEnd = templateBindings.length > 0 &&\n          templateBindings[templateBindings.length - 1].sourceSpan.end;\n      const normalizedPositionToBinding =\n          lastBindingEnd && this.position > lastBindingEnd ? lastBindingEnd : this.position;\n      const templateBinding =\n          templateBindings.find(b => inSpan(normalizedPositionToBinding, b.sourceSpan));\n\n      if (!templateBinding) {\n        return;\n      }\n\n      this.microSyntaxInAttributeValue(ast, templateBinding);\n    } else {\n      const expressionAst = this.info.expressionParser.parseBinding(\n          ast.value, ast.sourceSpan.toString(), ast.sourceSpan.start.offset);\n      this.processExpressionCompletions(expressionAst);\n    }\n  }\n\n  visitReference(_ast: ReferenceAst, context: ElementAst) {\n    context.directives.forEach(dir => {\n      const {exportAs} = dir.directive;\n      if (exportAs) {\n        this.completions.set(\n            exportAs, {name: exportAs, kind: ng.CompletionKind.REFERENCE, sortText: exportAs});\n      }\n    });\n  }\n\n  visitBoundText(ast: BoundTextAst) {\n    if (inSpan(this.position, ast.value.sourceSpan)) {\n      const completions = getExpressionCompletions(\n          this.getExpressionScope(), ast.value, this.position, this.info.template);\n      if (completions) {\n        this.addSymbolsToCompletions(completions);\n      }\n    }\n  }\n\n  private processExpressionCompletions(value: AST) {\n    const symbols = getExpressionCompletions(\n        this.getExpressionScope(), value, this.position, this.info.template);\n    if (symbols) {\n      this.addSymbolsToCompletions(symbols);\n    }\n  }\n\n  private addSymbolsToCompletions(symbols: ng.Symbol[]) {\n    for (const s of symbols) {\n      if (s.name.startsWith('__') || !s.public || this.completions.has(s.name)) {\n        continue;\n      }\n\n      // The pipe method should not include parentheses.\n      // e.g. {{ value_expression | slice : start [ : end ] }}\n      const shouldInsertParentheses = s.callable && s.kind !== ng.CompletionKind.PIPE;\n      this.completions.set(s.name, {\n        name: s.name,\n        kind: s.kind as ng.CompletionKind,\n        sortText: s.name,\n        insertText: shouldInsertParentheses ? `${s.name}()` : s.name,\n      });\n    }\n  }\n\n  /**\n   * This method handles the completions of attribute values for directives that\n   * support the microsyntax format. Examples are *ngFor and *ngIf.\n   * These directives allows declaration of \"let\" variables, adds context-specific\n   * symbols like $implicit, index, count, among other behaviors.\n   * For a complete description of such format, see\n   * https://angular.io/guide/structural-directives#the-asterisk--prefix\n   *\n   * @param attr descriptor for attribute name and value pair\n   * @param binding template binding for the expression in the attribute\n   */\n  private microSyntaxInAttributeValue(attr: AttrAst, binding: TemplateBinding) {\n    const key = attr.name.substring(1);  // remove leading asterisk\n\n    // Find the selector - eg ngFor, ngIf, etc\n    const selectorInfo = getSelectors(this.info);\n    const selector = selectorInfo.selectors.find(s => {\n      // attributes are listed in (attribute, value) pairs\n      for (let i = 0; i < s.attrs.length; i += 2) {\n        if (s.attrs[i] === key) {\n          return true;\n        }\n      }\n    });\n\n    if (!selector) {\n      return;\n    }\n\n    const valueRelativePosition = this.position - attr.sourceSpan.start.offset;\n\n    if (binding instanceof VariableBinding) {\n      // TODO(kyliau): With expression sourceSpan we shouldn't have to search\n      // the attribute value string anymore. Just check if position is in the\n      // expression source span.\n      const equalLocation = attr.value.indexOf('=');\n      if (equalLocation > 0 && valueRelativePosition > equalLocation) {\n        // We are after the '=' in a let clause. The valid values here are the members of the\n        // template reference's type parameter.\n        const directiveMetadata = selectorInfo.map.get(selector);\n        if (directiveMetadata) {\n          const contextTable =\n              this.info.template.query.getTemplateContext(directiveMetadata.type.reference);\n          if (contextTable) {\n            // This adds symbols like $implicit, index, count, etc.\n            this.addSymbolsToCompletions(contextTable.values());\n            return;\n          }\n        }\n      }\n    } else if (binding instanceof ExpressionBinding) {\n      if (inSpan(this.position, binding.value?.ast.sourceSpan)) {\n        this.processExpressionCompletions(binding.value!.ast);\n        return;\n      } else if (!binding.value && this.position > binding.key.span.end) {\n        // No expression is defined for the value of the key expression binding, but the cursor is\n        // in a location where the expression would be defined. This can happen in a case like\n        //   let i of |\n        //            ^-- cursor\n        // In this case, backfill the value to be an empty expression and retrieve completions.\n        this.processExpressionCompletions(new EmptyExpr(\n            new ParseSpan(valueRelativePosition, valueRelativePosition),\n            new AbsoluteSourceSpan(this.position, this.position)));\n        return;\n      }\n    }\n  }\n}\n\ninterface AngularAttributes {\n  /**\n   * Attributes that support the * syntax. See https://angular.io/api/core/TemplateRef\n   */\n  templateRefs: Set<string>;\n  /**\n   * Attributes with the @Input annotation.\n   */\n  inputs: Set<string>;\n  /**\n   * Attributes with the @Output annotation.\n   */\n  outputs: Set<string>;\n  /**\n   * Attributes that support the [()] or bindon- syntax.\n   */\n  bananas: Set<string>;\n  /**\n   * General attributes that match the specified element.\n   */\n  others: Set<string>;\n}\n\n/**\n * Return all Angular-specific attributes for the element with `elementName`.\n * @param info\n * @param elementName\n */\nfunction angularAttributes(info: ng.AstResult, elementName: string): AngularAttributes {\n  const {selectors, map: selectorMap} = getSelectors(info);\n  const templateRefs = new Set<string>();\n  const inputs = new Set<string>();\n  const outputs = new Set<string>();\n  const bananas = new Set<string>();\n  const others = new Set<string>();\n  for (const selector of selectors) {\n    if (selector.element && selector.element !== elementName) {\n      continue;\n    }\n    const summary = selectorMap.get(selector)!;\n    const hasTemplateRef = isStructuralDirective(summary.type);\n    // attributes are listed in (attribute, value) pairs\n    for (let i = 0; i < selector.attrs.length; i += 2) {\n      const attr = selector.attrs[i];\n      if (hasTemplateRef) {\n        templateRefs.add(attr);\n      } else {\n        others.add(attr);\n      }\n    }\n    for (const input of Object.values(summary.inputs)) {\n      inputs.add(input);\n    }\n    for (const output of Object.values(summary.outputs)) {\n      outputs.add(output);\n    }\n  }\n  for (const name of inputs) {\n    // Add banana-in-a-box syntax\n    // https://angular.io/guide/template-syntax#two-way-binding-\n    if (outputs.has(`${name}Change`)) {\n      bananas.add(name);\n    }\n  }\n  return {templateRefs, inputs, outputs, bananas, others};\n}\n"]} |
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