@angular/language-service/src/completions.js

/**
 * @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/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);
    }
})(function (require, exports) {
    "use strict";
    Object.defineProperty(exports, "__esModule", { value: true });
    exports.getTemplateCompletions = void 0;
    var tslib_1 = require("tslib");
    var compiler_1 = require("@angular/compiler");
    var chars_1 = require("@angular/compiler/src/chars");
    var binding_utils_1 = require("@angular/language-service/src/binding_utils");
    var expression_diagnostics_1 = require("@angular/language-service/src/expression_diagnostics");
    var expressions_1 = require("@angular/language-service/src/expressions");
    var html_info_1 = require("@angular/language-service/src/html_info");
    var template_1 = require("@angular/language-service/src/template");
    var ng = require("@angular/language-service/src/types");
    var utils_1 = require("@angular/language-service/src/utils");
    var HIDDEN_HTML_ELEMENTS = new Set(['html', 'script', 'noscript', 'base', 'body', 'title', 'head', 'link']);
    var HTML_ELEMENTS = html_info_1.elementNames().filter(function (name) { return !HIDDEN_HTML_ELEMENTS.has(name); }).map(function (name) {
        return {
            name: name,
            kind: ng.CompletionKind.HTML_ELEMENT,
            sortText: name,
        };
    });
    var ANGULAR_ELEMENTS = [
        {
            name: 'ng-container',
            kind: ng.CompletionKind.ANGULAR_ELEMENT,
            sortText: 'ng-container',
        },
        {
            name: 'ng-content',
            kind: ng.CompletionKind.ANGULAR_ELEMENT,
            sortText: 'ng-content',
        },
        {
            name: 'ng-template',
            kind: ng.CompletionKind.ANGULAR_ELEMENT,
            sortText: 'ng-template',
        },
    ];
    function isIdentifierPart(code) {
        // Identifiers consist of alphanumeric characters, '_', or '$'.
        return chars_1.isAsciiLetter(code) || chars_1.isDigit(code) || code == chars_1.$$ || code == chars_1.$_;
    }
    /**
     * Gets the span of word in a template that surrounds `position`. If there is no word around
     * `position`, nothing is returned.
     */
    function getBoundedWordSpan(templateInfo, position, ast) {
        var template = templateInfo.template;
        var templateSrc = template.source;
        if (!templateSrc)
            return;
        if (ast instanceof compiler_1.Element) {
            // The HTML tag may include `-` (e.g. `app-root`),
            // so use the HtmlAst to get the span before ayazhafiz refactor the code.
            return {
                start: templateInfo.template.span.start + ast.startSourceSpan.start.offset + 1,
                length: ast.name.length
            };
        }
        // TODO(ayazhafiz): A solution based on word expansion will always be expensive compared to one
        // based on ASTs. Whatever penalty we incur is probably manageable for small-length (i.e. the
        // majority of) identifiers, but the current solution involes a number of branchings and we can't
        // control potentially very long identifiers. Consider moving to an AST-based solution once
        // existing difficulties with AST spans are more clearly resolved (see #31898 for discussion of
        // known problems, and #33091 for how they affect text replacement).
        //
        // `templatePosition` represents the right-bound location of a cursor in the template.
        //    key.ent|ry
        //           ^---- cursor, at position `r` is at.
        // A cursor is not itself a character in the template; it has a left (lower) and right (upper)
        // index bound that hugs the cursor itself.
        var templatePosition = position - template.span.start;
        // To perform word expansion, we want to determine the left and right indices that hug the cursor.
        // There are three cases here.
        var left, right;
        if (templatePosition === 0) {
            // 1. Case like
            //      |rest of template
            //    the cursor is at the start of the template, hugged only by the right side (0-index).
            left = right = 0;
        }
        else if (templatePosition === templateSrc.length) {
            // 2. Case like
            //      rest of template|
            //    the cursor is at the end of the template, hugged only by the left side (last-index).
            left = right = templateSrc.length - 1;
        }
        else {
            // 3. Case like
            //      wo|rd
            //    there is a clear left and right index.
            left = templatePosition - 1;
            right = templatePosition;
        }
        if (!isIdentifierPart(templateSrc.charCodeAt(left)) &&
            !isIdentifierPart(templateSrc.charCodeAt(right))) {
            // Case like
            //         .|.
            // left ---^ ^--- right
            // There is no word here.
            return;
        }
        // Expand on the left and right side until a word boundary is hit. Back up one expansion on both
        // side to stay inside the word.
        while (left >= 0 && isIdentifierPart(templateSrc.charCodeAt(left)))
            --left;
        ++left;
        while (right < templateSrc.length && isIdentifierPart(templateSrc.charCodeAt(right)))
            ++right;
        --right;
        var absoluteStartPosition = position - (templatePosition - left);
        var length = right - left + 1;
        return { start: absoluteStartPosition, length: length };
    }
    function getTemplateCompletions(templateInfo, position) {
        var htmlAst = templateInfo.htmlAst, template = templateInfo.template;
        // Calculate the position relative to the start of the template. This is needed
        // because spans in HTML AST are relative. Inline template has non-zero start position.
        var templatePosition = position - template.span.start;
        var htmlPath = utils_1.getPathToNodeAtPosition(htmlAst, templatePosition);
        var mostSpecific = htmlPath.tail;
        var visitor = new HtmlVisitor(templateInfo, htmlPath);
        var results = mostSpecific ?
            mostSpecific.visit(visitor, null /* context */) :
            elementCompletions(templateInfo);
        var replacementSpan = getBoundedWordSpan(templateInfo, position, mostSpecific);
        return results.map(function (entry) {
            return tslib_1.__assign(tslib_1.__assign({}, entry), { replacementSpan: replacementSpan });
        });
    }
    exports.getTemplateCompletions = getTemplateCompletions;
    var HtmlVisitor = /** @class */ (function () {
        function HtmlVisitor(templateInfo, htmlPath) {
            this.templateInfo = templateInfo;
            this.htmlPath = htmlPath;
            this.relativePosition = htmlPath.position;
        }
        // Note that every visitor method must explicitly specify return type because
        // Visitor returns `any` for all methods.
        HtmlVisitor.prototype.visitElement = function (ast) {
            var startTagSpan = utils_1.spanOf(ast.sourceSpan);
            var tagLen = ast.name.length;
            // + 1 for the opening angle bracket
            if (this.relativePosition <= startTagSpan.start + tagLen + 1) {
                // If we are in the tag then return the element completions.
                return elementCompletions(this.templateInfo);
            }
            if (this.relativePosition < startTagSpan.end) {
                // We are in the attribute section of the element (but not in an attribute).
                // Return the attribute completions.
                return attributeCompletionsForElement(this.templateInfo, ast.name);
            }
            return [];
        };
        HtmlVisitor.prototype.visitAttribute = function (ast) {
            // An attribute consists of two parts, LHS="RHS".
            // Determine if completions are requested for LHS or RHS
            if (ast.valueSpan && utils_1.inSpan(this.relativePosition, utils_1.spanOf(ast.valueSpan))) {
                // RHS completion
                return attributeValueCompletions(this.templateInfo, this.htmlPath);
            }
            // LHS completion
            return attributeCompletions(this.templateInfo, this.htmlPath);
        };
        HtmlVisitor.prototype.visitText = function () {
            var _this = this;
            var _a;
            var templatePath = utils_1.findTemplateAstAt(this.templateInfo.templateAst, this.relativePosition);
            if (templatePath.tail instanceof compiler_1.BoundTextAst) {
                // If we know that this is an interpolation then do not try other scenarios.
                var visitor = new ExpressionVisitor(this.templateInfo, this.relativePosition, function () {
                    return expression_diagnostics_1.getExpressionScope(utils_1.diagnosticInfoFromTemplateInfo(_this.templateInfo), templatePath);
                });
                (_a = templatePath.tail) === null || _a === void 0 ? void 0 : _a.visit(visitor, null);
                return visitor.results;
            }
            // TODO(kyliau): Not sure if this check is really needed since we don't have
            // any test cases for it.
            var element = this.htmlPath.first(compiler_1.Element);
            if (element &&
                compiler_1.getHtmlTagDefinition(element.name).getContentType() !== compiler_1.TagContentType.PARSABLE_DATA) {
                return [];
            }
            // This is to account for cases like <h1> <a> text | </h1> where the
            // closest element has no closing tag and thus is considered plain text.
            var results = voidElementAttributeCompletions(this.templateInfo, this.htmlPath);
            if (results.length) {
                return results;
            }
            return elementCompletions(this.templateInfo);
        };
        HtmlVisitor.prototype.visitComment = function () {
            return [];
        };
        HtmlVisitor.prototype.visitExpansion = function () {
            return [];
        };
        HtmlVisitor.prototype.visitExpansionCase = function () {
            return [];
        };
        return HtmlVisitor;
    }());
    function attributeCompletions(info, path) {
        var attr = path.tail;
        var elem = path.parentOf(attr);
        if (!(attr instanceof compiler_1.Attribute) || !(elem instanceof compiler_1.Element)) {
            return [];
        }
        // TODO: Consider parsing the attrinute name to a proper AST instead of
        // matching using regex. This is because the regexp would incorrectly identify
        // bind parts for cases like [()|]
        //                              ^ cursor is here
        var binding = binding_utils_1.getBindingDescriptor(attr.name);
        if (!binding) {
            // This is a normal HTML attribute, not an Angular attribute.
            return attributeCompletionsForElement(info, elem.name);
        }
        var results = [];
        var ngAttrs = angularAttributes(info, elem.name);
        switch (binding.kind) {
            case binding_utils_1.ATTR.KW_MICROSYNTAX:
                // template reference attribute: *attrName
                results.push.apply(results, tslib_1.__spread(ngAttrs.templateRefs));
                break;
            case binding_utils_1.ATTR.KW_BIND:
            case binding_utils_1.ATTR.IDENT_PROPERTY:
                // property binding via bind- or []
                results.push.apply(results, tslib_1.__spread(html_info_1.propertyNames(elem.name), ngAttrs.inputs));
                break;
            case binding_utils_1.ATTR.KW_ON:
            case binding_utils_1.ATTR.IDENT_EVENT:
                // event binding via on- or ()
                results.push.apply(results, tslib_1.__spread(html_info_1.eventNames(elem.name), ngAttrs.outputs));
                break;
            case binding_utils_1.ATTR.KW_BINDON:
            case binding_utils_1.ATTR.IDENT_BANANA_BOX:
                // banana-in-a-box binding via bindon- or [()]
                results.push.apply(results, tslib_1.__spread(ngAttrs.bananas));
                break;
        }
        return results.map(function (name) {
            return {
                name: name,
                kind: ng.CompletionKind.ATTRIBUTE,
                sortText: name,
            };
        });
    }
    function attributeCompletionsForElement(info, elementName) {
        var e_1, _a, e_2, _b;
        var results = [];
        if (info.template instanceof template_1.InlineTemplate) {
            try {
                // Provide HTML attributes completion only for inline templates
                for (var _c = tslib_1.__values(html_info_1.attributeNames(elementName)), _d = _c.next(); !_d.done; _d = _c.next()) {
                    var name_1 = _d.value;
                    results.push({
                        name: name_1,
                        kind: ng.CompletionKind.HTML_ATTRIBUTE,
                        sortText: name_1,
                    });
                }
            }
            catch (e_1_1) { e_1 = { error: e_1_1 }; }
            finally {
                try {
                    if (_d && !_d.done && (_a = _c.return)) _a.call(_c);
                }
                finally { if (e_1) throw e_1.error; }
            }
        }
        // Add Angular attributes
        var ngAttrs = angularAttributes(info, elementName);
        try {
            for (var _e = tslib_1.__values(ngAttrs.others), _f = _e.next(); !_f.done; _f = _e.next()) {
                var name_2 = _f.value;
                results.push({
                    name: name_2,
                    kind: ng.CompletionKind.ATTRIBUTE,
                    sortText: name_2,
                });
            }
        }
        catch (e_2_1) { e_2 = { error: e_2_1 }; }
        finally {
            try {
                if (_f && !_f.done && (_b = _e.return)) _b.call(_e);
            }
            finally { if (e_2) throw e_2.error; }
        }
        return results;
    }
    /**
     * Provide completions to the RHS of an attribute, which is of the form
     * LHS="RHS". The template path is computed from the specified `info` whereas
     * the context is determined from the specified `htmlPath`.
     * @param info Object that contains the template AST
     * @param htmlPath Path to the HTML node
     */
    function attributeValueCompletions(info, htmlPath) {
        // Find the corresponding Template AST path.
        var templatePath = utils_1.findTemplateAstAt(info.templateAst, htmlPath.position);
        var visitor = new ExpressionVisitor(info, htmlPath.position, function () {
            var dinfo = utils_1.diagnosticInfoFromTemplateInfo(info);
            return expression_diagnostics_1.getExpressionScope(dinfo, templatePath);
        });
        if (templatePath.tail instanceof compiler_1.AttrAst ||
            templatePath.tail instanceof compiler_1.BoundElementPropertyAst ||
            templatePath.tail instanceof compiler_1.BoundEventAst) {
            templatePath.tail.visit(visitor, null);
            return visitor.results;
        }
        // In order to provide accurate attribute value completion, we need to know
        // what the LHS is, and construct the proper AST if it is missing.
        var htmlAttr = htmlPath.tail;
        var binding = binding_utils_1.getBindingDescriptor(htmlAttr.name);
        if (binding && binding.kind === binding_utils_1.ATTR.KW_REF) {
            var refAst = void 0;
            var elemAst = void 0;
            if (templatePath.tail instanceof compiler_1.ReferenceAst) {
                refAst = templatePath.tail;
                var parent_1 = templatePath.parentOf(refAst);
                if (parent_1 instanceof compiler_1.ElementAst) {
                    elemAst = parent_1;
                }
            }
            else if (templatePath.tail instanceof compiler_1.ElementAst) {
                refAst = new compiler_1.ReferenceAst(htmlAttr.name, null, htmlAttr.value, htmlAttr.valueSpan);
                elemAst = templatePath.tail;
            }
            if (refAst && elemAst) {
                refAst.visit(visitor, elemAst);
            }
        }
        else {
            // HtmlAst contains the `Attribute` node, however the corresponding `AttrAst`
            // node is missing from the TemplateAst.
            var attrAst = new compiler_1.AttrAst(htmlAttr.name, htmlAttr.value, htmlAttr.valueSpan);
            attrAst.visit(visitor, null);
        }
        return visitor.results;
    }
    function elementCompletions(info) {
        var e_3, _a;
        var results = tslib_1.__spread(ANGULAR_ELEMENTS);
        if (info.template instanceof template_1.InlineTemplate) {
            // Provide HTML elements completion only for inline templates
            results.push.apply(results, tslib_1.__spread(HTML_ELEMENTS));
        }
        // Collect the elements referenced by the selectors
        var components = new Set();
        try {
            for (var _b = tslib_1.__values(utils_1.getSelectors(info).selectors), _c = _b.next(); !_c.done; _c = _b.next()) {
                var selector = _c.value;
                var name_3 = selector.element;
                if (name_3 && !components.has(name_3)) {
                    components.add(name_3);
                    results.push({
                        name: name_3,
                        kind: ng.CompletionKind.COMPONENT,
                        sortText: name_3,
                    });
                }
            }
        }
        catch (e_3_1) { e_3 = { error: e_3_1 }; }
        finally {
            try {
                if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
            }
            finally { if (e_3) throw e_3.error; }
        }
        return results;
    }
    // There is a special case of HTML where text that contains a unclosed tag is treated as
    // text. For exaple '<h1> Some <a text </h1>' produces a text nodes inside of the H1
    // element "Some <a text". We, however, want to treat this as if the user was requesting
    // the attributes of an "a" element, not requesting completion in the a text element. This
    // code checks for this case and returns element completions if it is detected or undefined
    // if it is not.
    function voidElementAttributeCompletions(info, path) {
        var tail = path.tail;
        if (tail instanceof compiler_1.Text) {
            var match = tail.value.match(/<(\w(\w|\d|-)*:)?(\w(\w|\d|-)*)\s/);
            // The position must be after the match, otherwise we are still in a place where elements
            // are expected (such as `<|a` or `<a|`; we only want attributes for `<a |` or after).
            if (match &&
                path.position >= (match.index || 0) + match[0].length + tail.sourceSpan.start.offset) {
                return attributeCompletionsForElement(info, match[3]);
            }
        }
        return [];
    }
    var ExpressionVisitor = /** @class */ (function (_super) {
        tslib_1.__extends(ExpressionVisitor, _super);
        function ExpressionVisitor(info, position, getExpressionScope) {
            var _this = _super.call(this) || this;
            _this.info = info;
            _this.position = position;
            _this.getExpressionScope = getExpressionScope;
            _this.completions = new Map();
            return _this;
        }
        Object.defineProperty(ExpressionVisitor.prototype, "results", {
            get: function () {
                return Array.from(this.completions.values());
            },
            enumerable: false,
            configurable: true
        });
        ExpressionVisitor.prototype.visitDirectiveProperty = function (ast) {
            this.processExpressionCompletions(ast.value);
        };
        ExpressionVisitor.prototype.visitElementProperty = function (ast) {
            this.processExpressionCompletions(ast.value);
        };
        ExpressionVisitor.prototype.visitEvent = function (ast) {
            this.processExpressionCompletions(ast.handler);
        };
        ExpressionVisitor.prototype.visitElement = function () {
            // no-op for now
        };
        ExpressionVisitor.prototype.visitAttr = function (ast) {
            var binding = binding_utils_1.getBindingDescriptor(ast.name);
            if (binding && binding.kind === binding_utils_1.ATTR.KW_MICROSYNTAX) {
                // This a template binding given by micro syntax expression.
                // First, verify the attribute consists of some binding we can give completions for.
                // The sourceSpan of AttrAst points to the RHS of the attribute
                var templateKey = binding.name;
                var templateValue = ast.sourceSpan.toString();
                var templateUrl = ast.sourceSpan.start.file.url;
                // TODO(kyliau): We are unable to determine the absolute offset of the key
                // but it is okay here, because we are only looking at the RHS of the attr
                var absKeyOffset = 0;
                var absValueOffset = ast.sourceSpan.start.offset;
                var templateBindings = this.info.expressionParser.parseTemplateBindings(templateKey, templateValue, templateUrl, absKeyOffset, absValueOffset).templateBindings;
                // Find the nearest template binding to the position.
                var lastBindingEnd = templateBindings.length > 0 &&
                    templateBindings[templateBindings.length - 1].sourceSpan.end;
                var normalizedPositionToBinding_1 = lastBindingEnd && this.position > lastBindingEnd ? lastBindingEnd : this.position;
                var templateBinding = templateBindings.find(function (b) { return utils_1.inSpan(normalizedPositionToBinding_1, b.sourceSpan); });
                if (!templateBinding) {
                    return;
                }
                this.microSyntaxInAttributeValue(ast, templateBinding);
            }
            else {
                var expressionAst = this.info.expressionParser.parseBinding(ast.value, ast.sourceSpan.toString(), ast.sourceSpan.start.offset);
                this.processExpressionCompletions(expressionAst);
            }
        };
        ExpressionVisitor.prototype.visitReference = function (_ast, context) {
            var _this = this;
            context.directives.forEach(function (dir) {
                var exportAs = dir.directive.exportAs;
                if (exportAs) {
                    _this.completions.set(exportAs, { name: exportAs, kind: ng.CompletionKind.REFERENCE, sortText: exportAs });
                }
            });
        };
        ExpressionVisitor.prototype.visitBoundText = function (ast) {
            if (utils_1.inSpan(this.position, ast.value.sourceSpan)) {
                var completions = expressions_1.getExpressionCompletions(this.getExpressionScope(), ast.value, this.position, this.info.template);
                if (completions) {
                    this.addSymbolsToCompletions(completions);
                }
            }
        };
        ExpressionVisitor.prototype.processExpressionCompletions = function (value) {
            var symbols = expressions_1.getExpressionCompletions(this.getExpressionScope(), value, this.position, this.info.template);
            if (symbols) {
                this.addSymbolsToCompletions(symbols);
            }
        };
        ExpressionVisitor.prototype.addSymbolsToCompletions = function (symbols) {
            var e_4, _a;
            try {
                for (var symbols_1 = tslib_1.__values(symbols), symbols_1_1 = symbols_1.next(); !symbols_1_1.done; symbols_1_1 = symbols_1.next()) {
                    var s = symbols_1_1.value;
                    if (s.name.startsWith('__') || !s.public || this.completions.has(s.name)) {
                        continue;
                    }
                    // The pipe method should not include parentheses.
                    // e.g. {{ value_expression | slice : start [ : end ] }}
                    var shouldInsertParentheses = s.callable && s.kind !== ng.CompletionKind.PIPE;
                    this.completions.set(s.name, {
                        name: s.name,
                        kind: s.kind,
                        sortText: s.name,
                        insertText: shouldInsertParentheses ? s.name + "()" : s.name,
                    });
                }
            }
            catch (e_4_1) { e_4 = { error: e_4_1 }; }
            finally {
                try {
                    if (symbols_1_1 && !symbols_1_1.done && (_a = symbols_1.return)) _a.call(symbols_1);
                }
                finally { if (e_4) throw e_4.error; }
            }
        };
        /**
         * This method handles the completions of attribute values for directives that
         * support the microsyntax format. Examples are *ngFor and *ngIf.
         * These directives allows declaration of "let" variables, adds context-specific
         * symbols like $implicit, index, count, among other behaviors.
         * For a complete description of such format, see
         * https://angular.io/guide/structural-directives#the-asterisk--prefix
         *
         * @param attr descriptor for attribute name and value pair
         * @param binding template binding for the expression in the attribute
         */
        ExpressionVisitor.prototype.microSyntaxInAttributeValue = function (attr, binding) {
            var _a;
            var key = attr.name.substring(1); // remove leading asterisk
            // Find the selector - eg ngFor, ngIf, etc
            var selectorInfo = utils_1.getSelectors(this.info);
            var selector = selectorInfo.selectors.find(function (s) {
                // attributes are listed in (attribute, value) pairs
                for (var i = 0; i < s.attrs.length; i += 2) {
                    if (s.attrs[i] === key) {
                        return true;
                    }
                }
            });
            if (!selector) {
                return;
            }
            var valueRelativePosition = this.position - attr.sourceSpan.start.offset;
            if (binding instanceof compiler_1.VariableBinding) {
                // TODO(kyliau): With expression sourceSpan we shouldn't have to search
                // the attribute value string anymore. Just check if position is in the
                // expression source span.
                var equalLocation = attr.value.indexOf('=');
                if (equalLocation > 0 && valueRelativePosition > equalLocation) {
                    // We are after the '=' in a let clause. The valid values here are the members of the
                    // template reference's type parameter.
                    var directiveMetadata = selectorInfo.map.get(selector);
                    if (directiveMetadata) {
                        var contextTable = this.info.template.query.getTemplateContext(directiveMetadata.type.reference);
                        if (contextTable) {
                            // This adds symbols like $implicit, index, count, etc.
                            this.addSymbolsToCompletions(contextTable.values());
                            return;
                        }
                    }
                }
            }
            else if (binding instanceof compiler_1.ExpressionBinding) {
                if (utils_1.inSpan(this.position, (_a = binding.value) === null || _a === void 0 ? void 0 : _a.ast.sourceSpan)) {
                    this.processExpressionCompletions(binding.value.ast);
                    return;
                }
                else if (!binding.value && this.position > binding.key.span.end) {
                    // No expression is defined for the value of the key expression binding, but the cursor is
                    // in a location where the expression would be defined. This can happen in a case like
                    //   let i of |
                    //            ^-- cursor
                    // In this case, backfill the value to be an empty expression and retrieve completions.
                    this.processExpressionCompletions(new compiler_1.EmptyExpr(new compiler_1.ParseSpan(valueRelativePosition, valueRelativePosition), new compiler_1.AbsoluteSourceSpan(this.position, this.position)));
                    return;
                }
            }
        };
        return ExpressionVisitor;
    }(compiler_1.NullTemplateVisitor));
    /**
     * Return all Angular-specific attributes for the element with `elementName`.
     * @param info
     * @param elementName
     */
    function angularAttributes(info, elementName) {
        var e_5, _a, e_6, _b, e_7, _c, e_8, _d;
        var _e = utils_1.getSelectors(info), selectors = _e.selectors, selectorMap = _e.map;
        var templateRefs = new Set();
        var inputs = new Set();
        var outputs = new Set();
        var bananas = new Set();
        var others = new Set();
        try {
            for (var selectors_1 = tslib_1.__values(selectors), selectors_1_1 = selectors_1.next(); !selectors_1_1.done; selectors_1_1 = selectors_1.next()) {
                var selector = selectors_1_1.value;
                if (selector.element && selector.element !== elementName) {
                    continue;
                }
                var summary = selectorMap.get(selector);
                var hasTemplateRef = utils_1.isStructuralDirective(summary.type);
                // attributes are listed in (attribute, value) pairs
                for (var i = 0; i < selector.attrs.length; i += 2) {
                    var attr = selector.attrs[i];
                    if (hasTemplateRef) {
                        templateRefs.add(attr);
                    }
                    else {
                        others.add(attr);
                    }
                }
                try {
                    for (var _f = (e_6 = void 0, tslib_1.__values(Object.values(summary.inputs))), _g = _f.next(); !_g.done; _g = _f.next()) {
                        var input = _g.value;
                        inputs.add(input);
                    }
                }
                catch (e_6_1) { e_6 = { error: e_6_1 }; }
                finally {
                    try {
                        if (_g && !_g.done && (_b = _f.return)) _b.call(_f);
                    }
                    finally { if (e_6) throw e_6.error; }
                }
                try {
                    for (var _h = (e_7 = void 0, tslib_1.__values(Object.values(summary.outputs))), _j = _h.next(); !_j.done; _j = _h.next()) {
                        var output = _j.value;
                        outputs.add(output);
                    }
                }
                catch (e_7_1) { e_7 = { error: e_7_1 }; }
                finally {
                    try {
                        if (_j && !_j.done && (_c = _h.return)) _c.call(_h);
                    }
                    finally { if (e_7) throw e_7.error; }
                }
            }
        }
        catch (e_5_1) { e_5 = { error: e_5_1 }; }
        finally {
            try {
                if (selectors_1_1 && !selectors_1_1.done && (_a = selectors_1.return)) _a.call(selectors_1);
            }
            finally { if (e_5) throw e_5.error; }
        }
        try {
            for (var inputs_1 = tslib_1.__values(inputs), inputs_1_1 = inputs_1.next(); !inputs_1_1.done; inputs_1_1 = inputs_1.next()) {
                var name_4 = inputs_1_1.value;
                // Add banana-in-a-box syntax
                // https://angular.io/guide/template-syntax#two-way-binding-
                if (outputs.has(name_4 + "Change")) {
                    bananas.add(name_4);
                }
            }
        }
        catch (e_8_1) { e_8 = { error: e_8_1 }; }
        finally {
            try {
                if (inputs_1_1 && !inputs_1_1.done && (_d = inputs_1.return)) _d.call(inputs_1);
            }
            finally { if (e_8) throw e_8.error; }
        }
        return { templateRefs: templateRefs, inputs: inputs, outputs: outputs, bananas: bananas, others: others };
    }
});
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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).getContentType() !== 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"]}