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1
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* @license\n * Copyright Google Inc. 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, AstVisitor, Binary, BindingPipe, Chain, Conditional, FunctionCall, ImplicitReceiver, Interpolation, KeyedRead, KeyedWrite, LiteralArray, LiteralMap, LiteralPrimitive, MethodCall, NonNullAssert, PrefixNot, PropertyRead, PropertyWrite, Quote, SafeMethodCall, SafePropertyRead, visitAstChildren} from '@angular/compiler';\n\nimport {BuiltinType, Signature, Span, Symbol, SymbolQuery, SymbolTable} from './symbols';\n\nexport interface ExpressionDiagnosticsContext { event?: boolean; }\n\nexport enum DiagnosticKind {\n Error,\n Warning,\n}\n\nexport class TypeDiagnostic {\n constructor(public kind: DiagnosticKind, public message: string, public ast: AST) {}\n}\n\n// AstType calculatetype of the ast given AST element.\nexport class AstType implements AstVisitor {\n public diagnostics: TypeDiagnostic[];\n\n constructor(\n private scope: SymbolTable, private query: SymbolQuery,\n private context: ExpressionDiagnosticsContext) {}\n\n getType(ast: AST): Symbol { return ast.visit(this); }\n\n getDiagnostics(ast: AST): TypeDiagnostic[] {\n this.diagnostics = [];\n const type: Symbol = ast.visit(this);\n if (this.context.event && type.callable) {\n this.reportWarning('Unexpected callable expression. Expected a method call', ast);\n }\n return this.diagnostics;\n }\n\n visitBinary(ast: Binary): Symbol {\n // Treat undefined and null as other.\n function normalize(kind: BuiltinType, other: BuiltinType): BuiltinType {\n switch (kind) {\n case BuiltinType.Undefined:\n case BuiltinType.Null:\n return normalize(other, BuiltinType.Other);\n }\n return kind;\n }\n\n const getType = (ast: AST, operation: string): Symbol => {\n const type = this.getType(ast);\n if (type.nullable) {\n switch (operation) {\n case '&&':\n case '||':\n case '==':\n case '!=':\n case '===':\n case '!==':\n // Nullable allowed.\n break;\n default:\n this.reportError(`The expression might be null`, ast);\n break;\n }\n return this.query.getNonNullableType(type);\n }\n return type;\n };\n\n const leftType = getType(ast.left, ast.operation);\n const rightType = getType(ast.right, ast.operation);\n const leftRawKind = this.query.getTypeKind(leftType);\n const rightRawKind = this.query.getTypeKind(rightType);\n const leftKind = normalize(leftRawKind, rightRawKind);\n const rightKind = normalize(rightRawKind, leftRawKind);\n\n // The following swtich implements operator typing similar to the\n // type production tables in the TypeScript specification.\n // https://github.com/Microsoft/TypeScript/blob/v1.8.10/doc/spec.md#4.19\n const operKind = leftKind << 8 | rightKind;\n switch (ast.operation) {\n case '*':\n case '/':\n case '%':\n case '-':\n case '<<':\n case '>>':\n case '>>>':\n case '&':\n case '^':\n case '|':\n switch (operKind) {\n case BuiltinType.Any << 8 | BuiltinType.Any:\n case BuiltinType.Number << 8 | BuiltinType.Any:\n case BuiltinType.Any << 8 | BuiltinType.Number:\n case BuiltinType.Number << 8 | BuiltinType.Number:\n return this.query.getBuiltinType(BuiltinType.Number);\n default:\n let errorAst = ast.left;\n switch (leftKind) {\n case BuiltinType.Any:\n case BuiltinType.Number:\n errorAst = ast.right;\n break;\n }\n return this.reportError('Expected a numeric type', errorAst);\n }\n case '+':\n switch (operKind) {\n case BuiltinType.Any << 8 | BuiltinType.Any:\n case BuiltinType.Any << 8 | BuiltinType.Boolean:\n case BuiltinType.Any << 8 | BuiltinType.Number:\n case BuiltinType.Any << 8 | BuiltinType.Other:\n case BuiltinType.Boolean << 8 | BuiltinType.Any:\n case BuiltinType.Number << 8 | BuiltinType.Any:\n case BuiltinType.Other << 8 | BuiltinType.Any:\n return this.anyType;\n case BuiltinType.Any << 8 | BuiltinType.String:\n case BuiltinType.Boolean << 8 | BuiltinType.String:\n case BuiltinType.Number << 8 | BuiltinType.String:\n case BuiltinType.String << 8 | BuiltinType.Any:\n case BuiltinType.String << 8 | BuiltinType.Boolean:\n case BuiltinType.String << 8 | BuiltinType.Number:\n case BuiltinType.String << 8 | BuiltinType.String:\n case BuiltinType.String << 8 | BuiltinType.Other:\n case BuiltinType.Other << 8 | BuiltinType.String:\n return this.query.getBuiltinType(BuiltinType.String);\n case BuiltinType.Number << 8 | BuiltinType.Number:\n return this.query.getBuiltinType(BuiltinType.Number);\n case BuiltinType.Boolean << 8 | BuiltinType.Number:\n case BuiltinType.Other << 8 | BuiltinType.Number:\n return this.reportError('Expected a number type', ast.left);\n case BuiltinType.Number << 8 | BuiltinType.Boolean:\n case BuiltinType.Number << 8 | BuiltinType.Other:\n return this.reportError('Expected a number type', ast.right);\n default:\n return this.reportError('Expected operands to be a string or number type', ast);\n }\n case '>':\n case '<':\n case '<=':\n case '>=':\n case '==':\n case '!=':\n case '===':\n case '!==':\n switch (operKind) {\n case BuiltinType.Any << 8 | BuiltinType.Any:\n case BuiltinType.Any << 8 | BuiltinType.Boolean:\n case BuiltinType.Any << 8 | BuiltinType.Number:\n case BuiltinType.Any << 8 | BuiltinType.String:\n case BuiltinType.Any << 8 | BuiltinType.Other:\n case BuiltinType.Boolean << 8 | BuiltinType.Any:\n case BuiltinType.Boolean << 8 | BuiltinType.Boolean:\n case BuiltinType.Number << 8 | BuiltinType.Any:\n case BuiltinType.Number << 8 | BuiltinType.Number:\n case BuiltinType.String << 8 | BuiltinType.Any:\n case BuiltinType.String << 8 | BuiltinType.String:\n case BuiltinType.Other << 8 | BuiltinType.Any:\n case BuiltinType.Other << 8 | BuiltinType.Other:\n return this.query.getBuiltinType(BuiltinType.Boolean);\n default:\n return this.reportError('Expected the operants to be of similar type or any', ast);\n }\n case '&&':\n return rightType;\n case '||':\n return this.query.getTypeUnion(leftType, rightType);\n }\n\n return this.reportError(`Unrecognized operator ${ast.operation}`, ast);\n }\n\n visitChain(ast: Chain) {\n if (this.diagnostics) {\n // If we are producing diagnostics, visit the children\n visitAstChildren(ast, this);\n }\n // The type of a chain is always undefined.\n return this.query.getBuiltinType(BuiltinType.Undefined);\n }\n\n visitConditional(ast: Conditional) {\n // The type of a conditional is the union of the true and false conditions.\n if (this.diagnostics) {\n visitAstChildren(ast, this);\n }\n return this.query.getTypeUnion(this.getType(ast.trueExp), this.getType(ast.falseExp));\n }\n\n visitFunctionCall(ast: FunctionCall) {\n // The type of a function call is the return type of the selected signature.\n // The signature is selected based on the types of the arguments. Angular doesn't\n // support contextual typing of arguments so this is simpler than TypeScript's\n // version.\n const args = ast.args.map(arg => this.getType(arg));\n const target = this.getType(ast.target !);\n if (!target || !target.callable) return this.reportError('Call target is not callable', ast);\n const signature = target.selectSignature(args);\n if (signature) return signature.result;\n // TODO: Consider a better error message here.\n return this.reportError('Unable no compatible signature found for call', ast);\n }\n\n visitImplicitReceiver(ast: ImplicitReceiver): Symbol {\n const _this = this;\n // Return a pseudo-symbol for the implicit receiver.\n // The members of the implicit receiver are what is defined by the\n // scope passed into this class.\n return {\n name: '$implict',\n kind: 'component',\n language: 'ng-template',\n type: undefined,\n container: undefined,\n callable: false,\n nullable: false,\n public: true,\n definition: undefined,\n members(): SymbolTable{return _this.scope;},\n signatures(): Signature[]{return [];},\n selectSignature(types): Signature | undefined{return undefined;},\n indexed(argument): Symbol | undefined{return undefined;}\n };\n }\n\n visitInterpolation(ast: Interpolation): Symbol {\n // If we are producing diagnostics, visit the children.\n if (this.diagnostics) {\n visitAstChildren(ast, this);\n }\n return this.undefinedType;\n }\n\n visitKeyedRead(ast: KeyedRead): Symbol {\n const targetType = this.getType(ast.obj);\n const keyType = this.getType(ast.key);\n const result = targetType.indexed(keyType);\n return result || this.anyType;\n }\n\n visitKeyedWrite(ast: KeyedWrite): Symbol {\n // The write of a type is the type of the value being written.\n return this.getType(ast.value);\n }\n\n visitLiteralArray(ast: LiteralArray): Symbol {\n // A type literal is an array type of the union of the elements\n return this.query.getArrayType(\n this.query.getTypeUnion(...ast.expressions.map(element => this.getType(element))));\n }\n\n visitLiteralMap(ast: LiteralMap): Symbol {\n // If we are producing diagnostics, visit the children\n if (this.diagnostics) {\n visitAstChildren(ast, this);\n }\n // TODO: Return a composite type.\n return this.anyType;\n }\n\n visitLiteralPrimitive(ast: LiteralPrimitive) {\n // The type of a literal primitive depends on the value of the literal.\n switch (ast.value) {\n case true:\n case false:\n return this.query.getBuiltinType(BuiltinType.Boolean);\n case null:\n return this.query.getBuiltinType(BuiltinType.Null);\n case undefined:\n return this.query.getBuiltinType(BuiltinType.Undefined);\n default:\n switch (typeof ast.value) {\n case 'string':\n return this.query.getBuiltinType(BuiltinType.String);\n case 'number':\n return this.query.getBuiltinType(BuiltinType.Number);\n default:\n return this.reportError('Unrecognized primitive', ast);\n }\n }\n }\n\n visitMethodCall(ast: MethodCall) {\n return this.resolveMethodCall(this.getType(ast.receiver), ast);\n }\n\n visitPipe(ast: BindingPipe) {\n // The type of a pipe node is the return type of the pipe's transform method. The table returned\n // by getPipes() is expected to contain symbols with the corresponding transform method type.\n const pipe = this.query.getPipes().get(ast.name);\n if (!pipe) return this.reportError(`No pipe by the name ${ast.name} found`, ast);\n const expType = this.getType(ast.exp);\n const signature =\n pipe.selectSignature([expType].concat(ast.args.map(arg => this.getType(arg))));\n if (!signature) return this.reportError('Unable to resolve signature for pipe invocation', ast);\n return signature.result;\n }\n\n visitPrefixNot(ast: PrefixNot) {\n // The type of a prefix ! is always boolean.\n return this.query.getBuiltinType(BuiltinType.Boolean);\n }\n\n visitNonNullAssert(ast: NonNullAssert) {\n const expressionType = this.getType(ast.expression);\n return this.query.getNonNullableType(expressionType);\n }\n\n visitPropertyRead(ast: PropertyRead) {\n return this.resolvePropertyRead(this.getType(ast.receiver), ast);\n }\n\n visitPropertyWrite(ast: PropertyWrite) {\n // The type of a write is the type of the value being written.\n return this.getType(ast.value);\n }\n\n visitQuote(ast: Quote) {\n // The type of a quoted expression is any.\n return this.query.getBuiltinType(BuiltinType.Any);\n }\n\n visitSafeMethodCall(ast: SafeMethodCall) {\n return this.resolveMethodCall(this.query.getNonNullableType(this.getType(ast.receiver)), ast);\n }\n\n visitSafePropertyRead(ast: SafePropertyRead) {\n return this.resolvePropertyRead(this.query.getNonNullableType(this.getType(ast.receiver)), ast);\n }\n\n private _anyType: Symbol;\n private get anyType(): Symbol {\n let result = this._anyType;\n if (!result) {\n result = this._anyType = this.query.getBuiltinType(BuiltinType.Any);\n }\n return result;\n }\n\n private _undefinedType: Symbol;\n private get undefinedType(): Symbol {\n let result = this._undefinedType;\n if (!result) {\n result = this._undefinedType = this.query.getBuiltinType(BuiltinType.Undefined);\n }\n return result;\n }\n\n private resolveMethodCall(receiverType: Symbol, ast: SafeMethodCall|MethodCall) {\n if (this.isAny(receiverType)) {\n return this.anyType;\n }\n\n // The type of a method is the selected methods result type.\n const method = receiverType.members().get(ast.name);\n if (!method) return this.reportError(`Unknown method '${ast.name}'`, ast);\n if (!method.type) return this.reportError(`Could not find a type for '${ast.name}'`, ast);\n if (!method.type.callable) return this.reportError(`Member '${ast.name}' is not callable`, ast);\n const signature = method.type.selectSignature(ast.args.map(arg => this.getType(arg)));\n if (!signature)\n return this.reportError(`Unable to resolve signature for call of method ${ast.name}`, ast);\n return signature.result;\n }\n\n private resolvePropertyRead(receiverType: Symbol, ast: SafePropertyRead|PropertyRead) {\n if (this.isAny(receiverType)) {\n return this.anyType;\n }\n\n // The type of a property read is the seelcted member's type.\n const member = receiverType.members().get(ast.name);\n if (!member) {\n let receiverInfo = receiverType.name;\n if (receiverInfo == '$implict') {\n receiverInfo =\n 'The component declaration, template variable declarations, and element references do';\n } else if (receiverType.nullable) {\n return this.reportError(`The expression might be null`, ast.receiver);\n } else {\n receiverInfo = `'${receiverInfo}' does`;\n }\n return this.reportError(\n `Identifier '${ast.name}' is not defined. ${receiverInfo} not contain such a member`,\n ast);\n }\n if (!member.public) {\n let receiverInfo = receiverType.name;\n if (receiverInfo == '$implict') {\n receiverInfo = 'the component';\n } else {\n receiverInfo = `'${receiverInfo}'`;\n }\n this.reportWarning(\n `Identifier '${ast.name}' refers to a private member of ${receiverInfo}`, ast);\n }\n return member.type;\n }\n\n private reportError(message: string, ast: AST): Symbol {\n if (this.diagnostics) {\n this.diagnostics.push(new TypeDiagnostic(DiagnosticKind.Error, message, ast));\n }\n return this.anyType;\n }\n\n private reportWarning(message: string, ast: AST): Symbol {\n if (this.diagnostics) {\n this.diagnostics.push(new TypeDiagnostic(DiagnosticKind.Warning, message, ast));\n }\n return this.anyType;\n }\n\n private isAny(symbol: Symbol): boolean {\n return !symbol || this.query.getTypeKind(symbol) == BuiltinType.Any ||\n (!!symbol.type && this.isAny(symbol.type));\n }\n}"]}
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