@angular/language-service/src/expression_diagnostics.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/expression_diagnostics", ["require", "exports", "tslib", "@angular/compiler", "@angular/language-service/src/diagnostic_messages", "@angular/language-service/src/expression_type", "@angular/language-service/src/symbols", "@angular/language-service/src/utils"], factory);
    }
})(function (require, exports) {
    "use strict";
    Object.defineProperty(exports, "__esModule", { value: true });
    exports.getExpressionScope = exports.getTemplateExpressionDiagnostics = void 0;
    var tslib_1 = require("tslib");
    var compiler_1 = require("@angular/compiler");
    var diagnostic_messages_1 = require("@angular/language-service/src/diagnostic_messages");
    var expression_type_1 = require("@angular/language-service/src/expression_type");
    var symbols_1 = require("@angular/language-service/src/symbols");
    var utils_1 = require("@angular/language-service/src/utils");
    function getTemplateExpressionDiagnostics(info) {
        var visitor = new ExpressionDiagnosticsVisitor(info, function (path) { return getExpressionScope(info, path); });
        compiler_1.templateVisitAll(visitor, info.templateAst);
        return visitor.diagnostics;
    }
    exports.getTemplateExpressionDiagnostics = getTemplateExpressionDiagnostics;
    function getReferences(info) {
        var result = [];
        function processReferences(references) {
            var e_1, _a;
            var _loop_1 = function (reference) {
                var type = undefined;
                if (reference.value) {
                    type = info.query.getTypeSymbol(compiler_1.tokenReference(reference.value));
                }
                result.push({
                    name: reference.name,
                    kind: 'reference',
                    type: type || info.query.getBuiltinType(symbols_1.BuiltinType.Any),
                    get definition() {
                        return getDefinitionOf(info, reference);
                    }
                });
            };
            try {
                for (var references_1 = tslib_1.__values(references), references_1_1 = references_1.next(); !references_1_1.done; references_1_1 = references_1.next()) {
                    var reference = references_1_1.value;
                    _loop_1(reference);
                }
            }
            catch (e_1_1) { e_1 = { error: e_1_1 }; }
            finally {
                try {
                    if (references_1_1 && !references_1_1.done && (_a = references_1.return)) _a.call(references_1);
                }
                finally { if (e_1) throw e_1.error; }
            }
        }
        var visitor = new /** @class */ (function (_super) {
            tslib_1.__extends(class_1, _super);
            function class_1() {
                return _super !== null && _super.apply(this, arguments) || this;
            }
            class_1.prototype.visitEmbeddedTemplate = function (ast, context) {
                _super.prototype.visitEmbeddedTemplate.call(this, ast, context);
                processReferences(ast.references);
            };
            class_1.prototype.visitElement = function (ast, context) {
                _super.prototype.visitElement.call(this, ast, context);
                processReferences(ast.references);
            };
            return class_1;
        }(compiler_1.RecursiveTemplateAstVisitor));
        compiler_1.templateVisitAll(visitor, info.templateAst);
        return result;
    }
    function getDefinitionOf(info, ast) {
        if (info.fileName) {
            var templateOffset = info.offset;
            return [{
                    fileName: info.fileName,
                    span: {
                        start: ast.sourceSpan.start.offset + templateOffset,
                        end: ast.sourceSpan.end.offset + templateOffset
                    }
                }];
        }
    }
    /**
     * Resolve all variable declarations in a template by traversing the specified
     * `path`.
     * @param info
     * @param path template AST path
     */
    function getVarDeclarations(info, path) {
        var e_2, _a;
        var results = [];
        for (var current = path.head; current; current = path.childOf(current)) {
            if (!(current instanceof compiler_1.EmbeddedTemplateAst)) {
                continue;
            }
            var _loop_2 = function (variable) {
                var symbol = getVariableTypeFromDirectiveContext(variable.value, info.query, current);
                var kind = info.query.getTypeKind(symbol);
                if (kind === symbols_1.BuiltinType.Any || kind === symbols_1.BuiltinType.Unbound) {
                    // For special cases such as ngFor and ngIf, the any type is not very useful.
                    // We can do better by resolving the binding value.
                    var symbolsInScope = info.query.mergeSymbolTable([
                        info.members,
                        // Since we are traversing the AST path from head to tail, any variables
                        // that have been declared so far are also in scope.
                        info.query.createSymbolTable(results),
                    ]);
                    symbol = refinedVariableType(variable.value, symbolsInScope, info, current);
                }
                results.push({
                    name: variable.name,
                    kind: 'variable',
                    type: symbol,
                    get definition() {
                        return getDefinitionOf(info, variable);
                    },
                });
            };
            try {
                for (var _b = (e_2 = void 0, tslib_1.__values(current.variables)), _c = _b.next(); !_c.done; _c = _b.next()) {
                    var variable = _c.value;
                    _loop_2(variable);
                }
            }
            catch (e_2_1) { e_2 = { error: e_2_1 }; }
            finally {
                try {
                    if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
                }
                finally { if (e_2) throw e_2.error; }
            }
        }
        return results;
    }
    /**
     * Resolve the type for the variable in `templateElement` by finding the structural
     * directive which has the context member. Returns any when not found.
     * @param value variable value name
     * @param query type symbol query
     * @param templateElement
     */
    function getVariableTypeFromDirectiveContext(value, query, templateElement) {
        var e_3, _a;
        try {
            for (var _b = tslib_1.__values(templateElement.directives), _c = _b.next(); !_c.done; _c = _b.next()) {
                var directive = _c.value.directive;
                var context = query.getTemplateContext(directive.type.reference);
                if (context) {
                    var member = context.get(value);
                    if (member && member.type) {
                        return member.type;
                    }
                }
            }
        }
        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 query.getBuiltinType(symbols_1.BuiltinType.Any);
    }
    /**
     * Resolve a more specific type for the variable in `templateElement` by inspecting
     * all variables that are in scope in the `mergedTable`. This function is a special
     * case for `ngFor` and `ngIf`. If resolution fails, return the `any` type.
     * @param value variable value name
     * @param mergedTable symbol table for all variables in scope
     * @param info available template information
     * @param templateElement
     */
    function refinedVariableType(value, mergedTable, info, templateElement) {
        if (value === '$implicit') {
            // Special case: ngFor directive
            var ngForDirective = templateElement.directives.find(function (d) {
                var name = compiler_1.identifierName(d.directive.type);
                return name == 'NgFor' || name == 'NgForOf';
            });
            if (ngForDirective) {
                var ngForOfBinding = ngForDirective.inputs.find(function (i) { return i.directiveName == 'ngForOf'; });
                if (ngForOfBinding) {
                    // Check if there is a known type for the ngFor binding.
                    var bindingType = new expression_type_1.AstType(mergedTable, info.query, {}, info.source).getType(ngForOfBinding.value);
                    if (bindingType) {
                        var result = info.query.getElementType(bindingType);
                        if (result) {
                            return result;
                        }
                    }
                }
            }
        }
        if (value === 'ngIf' || value === '$implicit') {
            var ngIfDirective = templateElement.directives.find(function (d) { return compiler_1.identifierName(d.directive.type) === 'NgIf'; });
            if (ngIfDirective) {
                // Special case: ngIf directive. The NgIf structural directive owns a template context with
                // "$implicit" and "ngIf" members. These properties are typed as generics. Until the language
                // service uses an Ivy and TypecheckBlock backend, we cannot bind these values to a concrete
                // type without manual inference. To get the concrete type, look up the type of the "ngIf"
                // import on the NgIf directive bound to the template.
                //
                // See @angular/common/ng_if.ts for more information.
                var ngIfBinding = ngIfDirective.inputs.find(function (i) { return i.directiveName === 'ngIf'; });
                if (ngIfBinding) {
                    // Check if there is a known type bound to the ngIf input.
                    var bindingType = new expression_type_1.AstType(mergedTable, info.query, {}, info.source).getType(ngIfBinding.value);
                    if (bindingType) {
                        return bindingType;
                    }
                }
            }
        }
        // We can't do better, return any
        return info.query.getBuiltinType(symbols_1.BuiltinType.Any);
    }
    function getEventDeclaration(info, path) {
        var event = path.tail;
        if (!(event instanceof compiler_1.BoundEventAst)) {
            // No event available in this context.
            return;
        }
        var genericEvent = {
            name: '$event',
            kind: 'variable',
            type: info.query.getBuiltinType(symbols_1.BuiltinType.Any),
        };
        var outputSymbol = utils_1.findOutputBinding(event, path, info.query);
        if (!outputSymbol) {
            // The `$event` variable doesn't belong to an output, so its type can't be refined.
            // TODO: type `$event` variables in bindings to DOM events.
            return genericEvent;
        }
        // The raw event type is wrapped in a generic, like EventEmitter<T> or Observable<T>.
        var ta = outputSymbol.typeArguments();
        if (!ta || ta.length !== 1)
            return genericEvent;
        var eventType = ta[0];
        return tslib_1.__assign(tslib_1.__assign({}, genericEvent), { type: eventType });
    }
    /**
     * Returns the symbols available in a particular scope of a template.
     * @param info parsed template information
     * @param path path of template nodes narrowing to the context the expression scope should be
     * derived for.
     */
    function getExpressionScope(info, path) {
        var result = info.members;
        var references = getReferences(info);
        var variables = getVarDeclarations(info, path);
        var event = getEventDeclaration(info, path);
        if (references.length || variables.length || event) {
            var referenceTable = info.query.createSymbolTable(references);
            var variableTable = info.query.createSymbolTable(variables);
            var eventsTable = info.query.createSymbolTable(event ? [event] : []);
            result = info.query.mergeSymbolTable([result, referenceTable, variableTable, eventsTable]);
        }
        return result;
    }
    exports.getExpressionScope = getExpressionScope;
    var ExpressionDiagnosticsVisitor = /** @class */ (function (_super) {
        tslib_1.__extends(ExpressionDiagnosticsVisitor, _super);
        function ExpressionDiagnosticsVisitor(info, getExpressionScope) {
            var _this = _super.call(this) || this;
            _this.info = info;
            _this.getExpressionScope = getExpressionScope;
            _this.diagnostics = [];
            _this.path = new compiler_1.AstPath([]);
            return _this;
        }
        ExpressionDiagnosticsVisitor.prototype.visitDirective = function (ast, context) {
            // Override the default child visitor to ignore the host properties of a directive.
            if (ast.inputs && ast.inputs.length) {
                compiler_1.templateVisitAll(this, ast.inputs, context);
            }
        };
        ExpressionDiagnosticsVisitor.prototype.visitBoundText = function (ast) {
            this.push(ast);
            this.diagnoseExpression(ast.value, ast.sourceSpan.start.offset, false);
            this.pop();
        };
        ExpressionDiagnosticsVisitor.prototype.visitDirectiveProperty = function (ast) {
            this.push(ast);
            this.diagnoseExpression(ast.value, this.attributeValueLocation(ast), false);
            this.pop();
        };
        ExpressionDiagnosticsVisitor.prototype.visitElementProperty = function (ast) {
            this.push(ast);
            this.diagnoseExpression(ast.value, this.attributeValueLocation(ast), false);
            this.pop();
        };
        ExpressionDiagnosticsVisitor.prototype.visitEvent = function (ast) {
            this.push(ast);
            this.diagnoseExpression(ast.handler, this.attributeValueLocation(ast), true);
            this.pop();
        };
        ExpressionDiagnosticsVisitor.prototype.visitVariable = function (ast) {
            var directive = this.directiveSummary;
            if (directive && ast.value) {
                var context = this.info.query.getTemplateContext(directive.type.reference);
                if (context && !context.has(ast.value)) {
                    var missingMember = ast.value === '$implicit' ? 'an implicit value' : "a member called '" + ast.value + "'";
                    var span = this.absSpan(spanOf(ast.sourceSpan));
                    this.diagnostics.push(diagnostic_messages_1.createDiagnostic(span, diagnostic_messages_1.Diagnostic.template_context_missing_member, directive.type.reference.name, missingMember));
                }
            }
        };
        ExpressionDiagnosticsVisitor.prototype.visitElement = function (ast, context) {
            this.push(ast);
            _super.prototype.visitElement.call(this, ast, context);
            this.pop();
        };
        ExpressionDiagnosticsVisitor.prototype.visitEmbeddedTemplate = function (ast, context) {
            var previousDirectiveSummary = this.directiveSummary;
            this.push(ast);
            // Find directive that references this template
            this.directiveSummary =
                ast.directives.map(function (d) { return d.directive; }).find(function (d) { return hasTemplateReference(d.type); });
            // Process children
            _super.prototype.visitEmbeddedTemplate.call(this, ast, context);
            this.pop();
            this.directiveSummary = previousDirectiveSummary;
        };
        ExpressionDiagnosticsVisitor.prototype.attributeValueLocation = function (ast) {
            var path = utils_1.getPathToNodeAtPosition(this.info.htmlAst, ast.sourceSpan.start.offset);
            var last = path.tail;
            if (last instanceof compiler_1.Attribute && last.valueSpan) {
                return last.valueSpan.start.offset;
            }
            return ast.sourceSpan.start.offset;
        };
        ExpressionDiagnosticsVisitor.prototype.diagnoseExpression = function (ast, offset, inEvent) {
            var e_4, _a;
            var scope = this.getExpressionScope(this.path, inEvent);
            var analyzer = new expression_type_1.AstType(scope, this.info.query, { inEvent: inEvent }, this.info.source);
            try {
                for (var _b = tslib_1.__values(analyzer.getDiagnostics(ast)), _c = _b.next(); !_c.done; _c = _b.next()) {
                    var diagnostic = _c.value;
                    diagnostic.span = this.absSpan(diagnostic.span, offset);
                    this.diagnostics.push(diagnostic);
                }
            }
            catch (e_4_1) { e_4 = { error: e_4_1 }; }
            finally {
                try {
                    if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
                }
                finally { if (e_4) throw e_4.error; }
            }
        };
        ExpressionDiagnosticsVisitor.prototype.push = function (ast) {
            this.path.push(ast);
        };
        ExpressionDiagnosticsVisitor.prototype.pop = function () {
            this.path.pop();
        };
        ExpressionDiagnosticsVisitor.prototype.absSpan = function (span, additionalOffset) {
            if (additionalOffset === void 0) { additionalOffset = 0; }
            return {
                start: span.start + this.info.offset + additionalOffset,
                end: span.end + this.info.offset + additionalOffset,
            };
        };
        return ExpressionDiagnosticsVisitor;
    }(compiler_1.RecursiveTemplateAstVisitor));
    function hasTemplateReference(type) {
        var e_5, _a;
        if (type.diDeps) {
            try {
                for (var _b = tslib_1.__values(type.diDeps), _c = _b.next(); !_c.done; _c = _b.next()) {
                    var diDep = _c.value;
                    if (diDep.token && diDep.token.identifier &&
                        compiler_1.identifierName(diDep.token.identifier) == 'TemplateRef')
                        return true;
                }
            }
            catch (e_5_1) { e_5 = { error: e_5_1 }; }
            finally {
                try {
                    if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
                }
                finally { if (e_5) throw e_5.error; }
            }
        }
        return false;
    }
    function spanOf(sourceSpan) {
        return { start: sourceSpan.start.offset, end: sourceSpan.end.offset };
    }
});
//# 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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 {AST, AstPath, Attribute, BoundDirectivePropertyAst, BoundElementPropertyAst, BoundEventAst, BoundTextAst, CompileDirectiveSummary, CompileTypeMetadata, DirectiveAst, ElementAst, EmbeddedTemplateAst, identifierName, ParseSourceSpan, RecursiveTemplateAstVisitor, ReferenceAst, TemplateAst, TemplateAstPath, templateVisitAll, tokenReference, VariableAst} from '@angular/compiler';\n\nimport {createDiagnostic, Diagnostic} from './diagnostic_messages';\nimport {AstType} from './expression_type';\nimport {BuiltinType, Definition, Span, Symbol, SymbolDeclaration, SymbolQuery, SymbolTable} from './symbols';\nimport * as ng from './types';\nimport {findOutputBinding, getPathToNodeAtPosition} from './utils';\n\nexport function getTemplateExpressionDiagnostics(info: ng.DiagnosticTemplateInfo): ng.Diagnostic[] {\n  const visitor = new ExpressionDiagnosticsVisitor(\n      info, (path: TemplateAstPath) => getExpressionScope(info, path));\n  templateVisitAll(visitor, info.templateAst);\n  return visitor.diagnostics;\n}\n\nfunction getReferences(info: ng.DiagnosticTemplateInfo): SymbolDeclaration[] {\n  const result: SymbolDeclaration[] = [];\n\n  function processReferences(references: ReferenceAst[]) {\n    for (const reference of references) {\n      let type: Symbol|undefined = undefined;\n      if (reference.value) {\n        type = info.query.getTypeSymbol(tokenReference(reference.value));\n      }\n      result.push({\n        name: reference.name,\n        kind: 'reference',\n        type: type || info.query.getBuiltinType(BuiltinType.Any),\n        get definition() {\n          return getDefinitionOf(info, reference);\n        }\n      });\n    }\n  }\n\n  const visitor = new class extends RecursiveTemplateAstVisitor {\n    visitEmbeddedTemplate(ast: EmbeddedTemplateAst, context: any): any {\n      super.visitEmbeddedTemplate(ast, context);\n      processReferences(ast.references);\n    }\n    visitElement(ast: ElementAst, context: any): any {\n      super.visitElement(ast, context);\n      processReferences(ast.references);\n    }\n  };\n\n  templateVisitAll(visitor, info.templateAst);\n\n  return result;\n}\n\nfunction getDefinitionOf(info: ng.DiagnosticTemplateInfo, ast: TemplateAst): Definition|undefined {\n  if (info.fileName) {\n    const templateOffset = info.offset;\n    return [{\n      fileName: info.fileName,\n      span: {\n        start: ast.sourceSpan.start.offset + templateOffset,\n        end: ast.sourceSpan.end.offset + templateOffset\n      }\n    }];\n  }\n}\n\n/**\n * Resolve all variable declarations in a template by traversing the specified\n * `path`.\n * @param info\n * @param path template AST path\n */\nfunction getVarDeclarations(\n    info: ng.DiagnosticTemplateInfo, path: TemplateAstPath): SymbolDeclaration[] {\n  const results: SymbolDeclaration[] = [];\n  for (let current = path.head; current; current = path.childOf(current)) {\n    if (!(current instanceof EmbeddedTemplateAst)) {\n      continue;\n    }\n    for (const variable of current.variables) {\n      let symbol = getVariableTypeFromDirectiveContext(variable.value, info.query, current);\n\n      const kind = info.query.getTypeKind(symbol);\n      if (kind === BuiltinType.Any || kind === BuiltinType.Unbound) {\n        // For special cases such as ngFor and ngIf, the any type is not very useful.\n        // We can do better by resolving the binding value.\n        const symbolsInScope = info.query.mergeSymbolTable([\n          info.members,\n          // Since we are traversing the AST path from head to tail, any variables\n          // that have been declared so far are also in scope.\n          info.query.createSymbolTable(results),\n        ]);\n        symbol = refinedVariableType(variable.value, symbolsInScope, info, current);\n      }\n      results.push({\n        name: variable.name,\n        kind: 'variable',\n        type: symbol,\n        get definition() {\n          return getDefinitionOf(info, variable);\n        },\n      });\n    }\n  }\n  return results;\n}\n\n/**\n * Resolve the type for the variable in `templateElement` by finding the structural\n * directive which has the context member. Returns any when not found.\n * @param value variable value name\n * @param query type symbol query\n * @param templateElement\n */\nfunction getVariableTypeFromDirectiveContext(\n    value: string, query: SymbolQuery, templateElement: EmbeddedTemplateAst): Symbol {\n  for (const {directive} of templateElement.directives) {\n    const context = query.getTemplateContext(directive.type.reference);\n    if (context) {\n      const member = context.get(value);\n      if (member && member.type) {\n        return member.type;\n      }\n    }\n  }\n\n  return query.getBuiltinType(BuiltinType.Any);\n}\n\n/**\n * Resolve a more specific type for the variable in `templateElement` by inspecting\n * all variables that are in scope in the `mergedTable`. This function is a special\n * case for `ngFor` and `ngIf`. If resolution fails, return the `any` type.\n * @param value variable value name\n * @param mergedTable symbol table for all variables in scope\n * @param info available template information\n * @param templateElement\n */\nfunction refinedVariableType(\n    value: string, mergedTable: SymbolTable, info: ng.DiagnosticTemplateInfo,\n    templateElement: EmbeddedTemplateAst): Symbol {\n  if (value === '$implicit') {\n    // Special case: ngFor directive\n    const ngForDirective = templateElement.directives.find(d => {\n      const name = identifierName(d.directive.type);\n      return name == 'NgFor' || name == 'NgForOf';\n    });\n    if (ngForDirective) {\n      const ngForOfBinding = ngForDirective.inputs.find(i => i.directiveName == 'ngForOf');\n      if (ngForOfBinding) {\n        // Check if there is a known type for the ngFor binding.\n        const bindingType =\n            new AstType(mergedTable, info.query, {}, info.source).getType(ngForOfBinding.value);\n        if (bindingType) {\n          const result = info.query.getElementType(bindingType);\n          if (result) {\n            return result;\n          }\n        }\n      }\n    }\n  }\n\n  if (value === 'ngIf' || value === '$implicit') {\n    const ngIfDirective =\n        templateElement.directives.find(d => identifierName(d.directive.type) === 'NgIf');\n    if (ngIfDirective) {\n      // Special case: ngIf directive. The NgIf structural directive owns a template context with\n      // \"$implicit\" and \"ngIf\" members. These properties are typed as generics. Until the language\n      // service uses an Ivy and TypecheckBlock backend, we cannot bind these values to a concrete\n      // type without manual inference. To get the concrete type, look up the type of the \"ngIf\"\n      // import on the NgIf directive bound to the template.\n      //\n      // See @angular/common/ng_if.ts for more information.\n      const ngIfBinding = ngIfDirective.inputs.find(i => i.directiveName === 'ngIf');\n      if (ngIfBinding) {\n        // Check if there is a known type bound to the ngIf input.\n        const bindingType =\n            new AstType(mergedTable, info.query, {}, info.source).getType(ngIfBinding.value);\n        if (bindingType) {\n          return bindingType;\n        }\n      }\n    }\n  }\n\n  // We can't do better, return any\n  return info.query.getBuiltinType(BuiltinType.Any);\n}\n\nfunction getEventDeclaration(\n    info: ng.DiagnosticTemplateInfo, path: TemplateAstPath): SymbolDeclaration|undefined {\n  const event = path.tail;\n  if (!(event instanceof BoundEventAst)) {\n    // No event available in this context.\n    return;\n  }\n\n  const genericEvent: SymbolDeclaration = {\n    name: '$event',\n    kind: 'variable',\n    type: info.query.getBuiltinType(BuiltinType.Any),\n  };\n\n  const outputSymbol = findOutputBinding(event, path, info.query);\n  if (!outputSymbol) {\n    // The `$event` variable doesn't belong to an output, so its type can't be refined.\n    // TODO: type `$event` variables in bindings to DOM events.\n    return genericEvent;\n  }\n\n  // The raw event type is wrapped in a generic, like EventEmitter<T> or Observable<T>.\n  const ta = outputSymbol.typeArguments();\n  if (!ta || ta.length !== 1) return genericEvent;\n  const eventType = ta[0];\n\n  return {...genericEvent, type: eventType};\n}\n\n/**\n * Returns the symbols available in a particular scope of a template.\n * @param info parsed template information\n * @param path path of template nodes narrowing to the context the expression scope should be\n * derived for.\n */\nexport function getExpressionScope(\n    info: ng.DiagnosticTemplateInfo, path: TemplateAstPath): SymbolTable {\n  let result = info.members;\n  const references = getReferences(info);\n  const variables = getVarDeclarations(info, path);\n  const event = getEventDeclaration(info, path);\n  if (references.length || variables.length || event) {\n    const referenceTable = info.query.createSymbolTable(references);\n    const variableTable = info.query.createSymbolTable(variables);\n    const eventsTable = info.query.createSymbolTable(event ? [event] : []);\n    result = info.query.mergeSymbolTable([result, referenceTable, variableTable, eventsTable]);\n  }\n  return result;\n}\n\nclass ExpressionDiagnosticsVisitor extends RecursiveTemplateAstVisitor {\n  private path: TemplateAstPath;\n  private directiveSummary: CompileDirectiveSummary|undefined;\n\n  diagnostics: ng.Diagnostic[] = [];\n\n  constructor(\n      private info: ng.DiagnosticTemplateInfo,\n      private getExpressionScope: (path: TemplateAstPath, includeEvent: boolean) => SymbolTable) {\n    super();\n    this.path = new AstPath<TemplateAst>([]);\n  }\n\n  visitDirective(ast: DirectiveAst, context: any): any {\n    // Override the default child visitor to ignore the host properties of a directive.\n    if (ast.inputs && ast.inputs.length) {\n      templateVisitAll(this, ast.inputs, context);\n    }\n  }\n\n  visitBoundText(ast: BoundTextAst): void {\n    this.push(ast);\n    this.diagnoseExpression(ast.value, ast.sourceSpan.start.offset, false);\n    this.pop();\n  }\n\n  visitDirectiveProperty(ast: BoundDirectivePropertyAst): void {\n    this.push(ast);\n    this.diagnoseExpression(ast.value, this.attributeValueLocation(ast), false);\n    this.pop();\n  }\n\n  visitElementProperty(ast: BoundElementPropertyAst): void {\n    this.push(ast);\n    this.diagnoseExpression(ast.value, this.attributeValueLocation(ast), false);\n    this.pop();\n  }\n\n  visitEvent(ast: BoundEventAst): void {\n    this.push(ast);\n    this.diagnoseExpression(ast.handler, this.attributeValueLocation(ast), true);\n    this.pop();\n  }\n\n  visitVariable(ast: VariableAst): void {\n    const directive = this.directiveSummary;\n    if (directive && ast.value) {\n      const context = this.info.query.getTemplateContext(directive.type.reference)!;\n      if (context && !context.has(ast.value)) {\n        const missingMember =\n            ast.value === '$implicit' ? 'an implicit value' : `a member called '${ast.value}'`;\n\n        const span = this.absSpan(spanOf(ast.sourceSpan));\n        this.diagnostics.push(createDiagnostic(\n            span, Diagnostic.template_context_missing_member, directive.type.reference.name,\n            missingMember));\n      }\n    }\n  }\n\n  visitElement(ast: ElementAst, context: any): void {\n    this.push(ast);\n    super.visitElement(ast, context);\n    this.pop();\n  }\n\n  visitEmbeddedTemplate(ast: EmbeddedTemplateAst, context: any): any {\n    const previousDirectiveSummary = this.directiveSummary;\n\n    this.push(ast);\n\n    // Find directive that references this template\n    this.directiveSummary =\n        ast.directives.map(d => d.directive).find(d => hasTemplateReference(d.type))!;\n\n    // Process children\n    super.visitEmbeddedTemplate(ast, context);\n\n    this.pop();\n\n    this.directiveSummary = previousDirectiveSummary;\n  }\n\n  private attributeValueLocation(ast: TemplateAst) {\n    const path = getPathToNodeAtPosition(this.info.htmlAst, ast.sourceSpan.start.offset);\n    const last = path.tail;\n    if (last instanceof Attribute && last.valueSpan) {\n      return last.valueSpan.start.offset;\n    }\n    return ast.sourceSpan.start.offset;\n  }\n\n  private diagnoseExpression(ast: AST, offset: number, inEvent: boolean) {\n    const scope = this.getExpressionScope(this.path, inEvent);\n    const analyzer = new AstType(scope, this.info.query, {inEvent}, this.info.source);\n    for (const diagnostic of analyzer.getDiagnostics(ast)) {\n      diagnostic.span = this.absSpan(diagnostic.span, offset);\n      this.diagnostics.push(diagnostic);\n    }\n  }\n\n  private push(ast: TemplateAst) {\n    this.path.push(ast);\n  }\n\n  private pop() {\n    this.path.pop();\n  }\n\n  private absSpan(span: Span, additionalOffset: number = 0): Span {\n    return {\n      start: span.start + this.info.offset + additionalOffset,\n      end: span.end + this.info.offset + additionalOffset,\n    };\n  }\n}\n\nfunction hasTemplateReference(type: CompileTypeMetadata): boolean {\n  if (type.diDeps) {\n    for (let diDep of type.diDeps) {\n      if (diDep.token && diDep.token.identifier &&\n          identifierName(diDep.token!.identifier!) == 'TemplateRef')\n        return true;\n    }\n  }\n  return false;\n}\n\nfunction spanOf(sourceSpan: ParseSourceSpan): Span {\n  return {start: sourceSpan.start.offset, end: sourceSpan.end.offset};\n}\n"]}