/
interpreter.ts
629 lines (571 loc) Β· 24.1 KB
/
interpreter.ts
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/**
* @license
* Copyright Google Inc. 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
*/
import * as ts from 'typescript';
import {Reference} from '../../imports';
import {OwningModule} from '../../imports/src/references';
import {Declaration, InlineDeclaration, ReflectionHost} from '../../reflection';
import {isDeclaration} from '../../util/src/typescript';
import {ArrayConcatBuiltinFn, ArraySliceBuiltinFn} from './builtin';
import {DynamicValue} from './dynamic';
import {DependencyTracker, ForeignFunctionResolver} from './interface';
import {BuiltinFn, EnumValue, ResolvedValue, ResolvedValueArray, ResolvedValueMap} from './result';
import {evaluateTsHelperInline} from './ts_helpers';
/**
* Tracks the scope of a function body, which includes `ResolvedValue`s for the parameters of that
* body.
*/
type Scope = Map<ts.ParameterDeclaration, ResolvedValue>;
interface BinaryOperatorDef {
literal: boolean;
op: (a: any, b: any) => ResolvedValue;
}
function literalBinaryOp(op: (a: any, b: any) => any): BinaryOperatorDef {
return {op, literal: true};
}
function referenceBinaryOp(op: (a: any, b: any) => any): BinaryOperatorDef {
return {op, literal: false};
}
const BINARY_OPERATORS = new Map<ts.SyntaxKind, BinaryOperatorDef>([
[ts.SyntaxKind.PlusToken, literalBinaryOp((a, b) => a + b)],
[ts.SyntaxKind.MinusToken, literalBinaryOp((a, b) => a - b)],
[ts.SyntaxKind.AsteriskToken, literalBinaryOp((a, b) => a * b)],
[ts.SyntaxKind.SlashToken, literalBinaryOp((a, b) => a / b)],
[ts.SyntaxKind.PercentToken, literalBinaryOp((a, b) => a % b)],
[ts.SyntaxKind.AmpersandToken, literalBinaryOp((a, b) => a & b)],
[ts.SyntaxKind.BarToken, literalBinaryOp((a, b) => a | b)],
[ts.SyntaxKind.CaretToken, literalBinaryOp((a, b) => a ^ b)],
[ts.SyntaxKind.LessThanToken, literalBinaryOp((a, b) => a < b)],
[ts.SyntaxKind.LessThanEqualsToken, literalBinaryOp((a, b) => a <= b)],
[ts.SyntaxKind.GreaterThanToken, literalBinaryOp((a, b) => a > b)],
[ts.SyntaxKind.GreaterThanEqualsToken, literalBinaryOp((a, b) => a >= b)],
[ts.SyntaxKind.EqualsEqualsToken, literalBinaryOp((a, b) => a == b)],
[ts.SyntaxKind.EqualsEqualsEqualsToken, literalBinaryOp((a, b) => a === b)],
[ts.SyntaxKind.ExclamationEqualsToken, literalBinaryOp((a, b) => a != b)],
[ts.SyntaxKind.ExclamationEqualsEqualsToken, literalBinaryOp((a, b) => a !== b)],
[ts.SyntaxKind.LessThanLessThanToken, literalBinaryOp((a, b) => a << b)],
[ts.SyntaxKind.GreaterThanGreaterThanToken, literalBinaryOp((a, b) => a >> b)],
[ts.SyntaxKind.GreaterThanGreaterThanGreaterThanToken, literalBinaryOp((a, b) => a >>> b)],
[ts.SyntaxKind.AsteriskAsteriskToken, literalBinaryOp((a, b) => Math.pow(a, b))],
[ts.SyntaxKind.AmpersandAmpersandToken, referenceBinaryOp((a, b) => a && b)],
[ts.SyntaxKind.BarBarToken, referenceBinaryOp((a, b) => a || b)]
]);
const UNARY_OPERATORS = new Map<ts.SyntaxKind, (a: any) => any>([
[ts.SyntaxKind.TildeToken, a => ~a], [ts.SyntaxKind.MinusToken, a => -a],
[ts.SyntaxKind.PlusToken, a => +a], [ts.SyntaxKind.ExclamationToken, a => !a]
]);
interface Context {
originatingFile: ts.SourceFile;
/**
* The module name (if any) which was used to reach the currently resolving symbols.
*/
absoluteModuleName: string|null;
/**
* A file name representing the context in which the current `absoluteModuleName`, if any, was
* resolved.
*/
resolutionContext: string;
scope: Scope;
foreignFunctionResolver?: ForeignFunctionResolver;
}
export class StaticInterpreter {
constructor(
private host: ReflectionHost, private checker: ts.TypeChecker,
private dependencyTracker?: DependencyTracker) {}
visit(node: ts.Expression, context: Context): ResolvedValue {
return this.visitExpression(node, context);
}
private visitExpression(node: ts.Expression, context: Context): ResolvedValue {
let result: ResolvedValue;
if (node.kind === ts.SyntaxKind.TrueKeyword) {
return true;
} else if (node.kind === ts.SyntaxKind.FalseKeyword) {
return false;
} else if (node.kind === ts.SyntaxKind.NullKeyword) {
return null;
} else if (ts.isStringLiteral(node)) {
return node.text;
} else if (ts.isNoSubstitutionTemplateLiteral(node)) {
return node.text;
} else if (ts.isTemplateExpression(node)) {
result = this.visitTemplateExpression(node, context);
} else if (ts.isNumericLiteral(node)) {
return parseFloat(node.text);
} else if (ts.isObjectLiteralExpression(node)) {
result = this.visitObjectLiteralExpression(node, context);
} else if (ts.isIdentifier(node)) {
result = this.visitIdentifier(node, context);
} else if (ts.isPropertyAccessExpression(node)) {
result = this.visitPropertyAccessExpression(node, context);
} else if (ts.isCallExpression(node)) {
result = this.visitCallExpression(node, context);
} else if (ts.isConditionalExpression(node)) {
result = this.visitConditionalExpression(node, context);
} else if (ts.isPrefixUnaryExpression(node)) {
result = this.visitPrefixUnaryExpression(node, context);
} else if (ts.isBinaryExpression(node)) {
result = this.visitBinaryExpression(node, context);
} else if (ts.isArrayLiteralExpression(node)) {
result = this.visitArrayLiteralExpression(node, context);
} else if (ts.isParenthesizedExpression(node)) {
result = this.visitParenthesizedExpression(node, context);
} else if (ts.isElementAccessExpression(node)) {
result = this.visitElementAccessExpression(node, context);
} else if (ts.isAsExpression(node)) {
result = this.visitExpression(node.expression, context);
} else if (ts.isNonNullExpression(node)) {
result = this.visitExpression(node.expression, context);
} else if (this.host.isClass(node)) {
result = this.visitDeclaration(node, context);
} else {
return DynamicValue.fromUnsupportedSyntax(node);
}
if (result instanceof DynamicValue && result.node !== node) {
return DynamicValue.fromDynamicInput(node, result);
}
return result;
}
private visitArrayLiteralExpression(node: ts.ArrayLiteralExpression, context: Context):
ResolvedValue {
const array: ResolvedValueArray = [];
for (let i = 0; i < node.elements.length; i++) {
const element = node.elements[i];
if (ts.isSpreadElement(element)) {
array.push(...this.visitSpreadElement(element, context));
} else {
array.push(this.visitExpression(element, context));
}
}
return array;
}
private visitObjectLiteralExpression(node: ts.ObjectLiteralExpression, context: Context):
ResolvedValue {
const map: ResolvedValueMap = new Map<string, ResolvedValue>();
for (let i = 0; i < node.properties.length; i++) {
const property = node.properties[i];
if (ts.isPropertyAssignment(property)) {
const name = this.stringNameFromPropertyName(property.name, context);
// Check whether the name can be determined statically.
if (name === undefined) {
return DynamicValue.fromDynamicInput(node, DynamicValue.fromDynamicString(property.name));
}
map.set(name, this.visitExpression(property.initializer, context));
} else if (ts.isShorthandPropertyAssignment(property)) {
const symbol = this.checker.getShorthandAssignmentValueSymbol(property);
if (symbol === undefined || symbol.valueDeclaration === undefined) {
map.set(property.name.text, DynamicValue.fromUnknown(property));
} else {
map.set(property.name.text, this.visitDeclaration(symbol.valueDeclaration, context));
}
} else if (ts.isSpreadAssignment(property)) {
const spread = this.visitExpression(property.expression, context);
if (spread instanceof DynamicValue) {
return DynamicValue.fromDynamicInput(node, spread);
} else if (!(spread instanceof Map)) {
return DynamicValue.fromDynamicInput(
node, DynamicValue.fromInvalidExpressionType(property, spread));
}
spread.forEach((value, key) => map.set(key, value));
} else {
return DynamicValue.fromUnknown(node);
}
}
return map;
}
private visitTemplateExpression(node: ts.TemplateExpression, context: Context): ResolvedValue {
const pieces: string[] = [node.head.text];
for (let i = 0; i < node.templateSpans.length; i++) {
const span = node.templateSpans[i];
let value = this.visit(span.expression, context);
if (value instanceof EnumValue) {
value = value.resolved;
}
if (typeof value === 'string' || typeof value === 'number' || typeof value === 'boolean' ||
value == null) {
pieces.push(`${value}`);
} else if (value instanceof DynamicValue) {
return DynamicValue.fromDynamicInput(node, value);
} else {
return DynamicValue.fromDynamicInput(node, DynamicValue.fromDynamicString(span.expression));
}
pieces.push(span.literal.text);
}
return pieces.join('');
}
private visitIdentifier(node: ts.Identifier, context: Context): ResolvedValue {
const decl = this.host.getDeclarationOfIdentifier(node);
if (decl === null) {
if (node.originalKeywordKind === ts.SyntaxKind.UndefinedKeyword) {
return undefined;
} else {
return DynamicValue.fromUnknownIdentifier(node);
}
}
const declContext = {...context, ...joinModuleContext(context, node, decl)};
// The identifier's declaration is either concrete (a ts.Declaration exists for it) or inline
// (a direct reference to a ts.Expression).
// TODO(alxhub): remove cast once TS is upgraded in g3.
const result = decl.node !== null ?
this.visitDeclaration(decl.node, declContext) :
this.visitExpression((decl as InlineDeclaration).expression, declContext);
if (result instanceof Reference) {
// Only record identifiers to non-synthetic references. Synthetic references may not have the
// same value at runtime as they do at compile time, so it's not legal to refer to them by the
// identifier here.
if (!result.synthetic) {
result.addIdentifier(node);
}
} else if (result instanceof DynamicValue) {
return DynamicValue.fromDynamicInput(node, result);
}
return result;
}
private visitDeclaration(node: ts.Declaration, context: Context): ResolvedValue {
if (this.dependencyTracker) {
this.dependencyTracker.trackFileDependency(node.getSourceFile(), context.originatingFile);
}
if (this.host.isClass(node)) {
return this.getReference(node, context);
} else if (ts.isVariableDeclaration(node)) {
return this.visitVariableDeclaration(node, context);
} else if (ts.isParameter(node) && context.scope.has(node)) {
return context.scope.get(node) !;
} else if (ts.isExportAssignment(node)) {
return this.visitExpression(node.expression, context);
} else if (ts.isEnumDeclaration(node)) {
return this.visitEnumDeclaration(node, context);
} else if (ts.isSourceFile(node)) {
return this.visitSourceFile(node, context);
} else {
return this.getReference(node, context);
}
}
private visitVariableDeclaration(node: ts.VariableDeclaration, context: Context): ResolvedValue {
const value = this.host.getVariableValue(node);
if (value !== null) {
return this.visitExpression(value, context);
} else if (isVariableDeclarationDeclared(node)) {
return this.getReference(node, context);
} else {
return undefined;
}
}
private visitEnumDeclaration(node: ts.EnumDeclaration, context: Context): ResolvedValue {
const enumRef = this.getReference(node, context) as Reference<ts.EnumDeclaration>;
const map = new Map<string, EnumValue>();
node.members.forEach(member => {
const name = this.stringNameFromPropertyName(member.name, context);
if (name !== undefined) {
const resolved = member.initializer && this.visit(member.initializer, context);
map.set(name, new EnumValue(enumRef, name, resolved));
}
});
return map;
}
private visitElementAccessExpression(node: ts.ElementAccessExpression, context: Context):
ResolvedValue {
const lhs = this.visitExpression(node.expression, context);
if (lhs instanceof DynamicValue) {
return DynamicValue.fromDynamicInput(node, lhs);
}
const rhs = this.visitExpression(node.argumentExpression, context);
if (rhs instanceof DynamicValue) {
return DynamicValue.fromDynamicInput(node, rhs);
}
if (typeof rhs !== 'string' && typeof rhs !== 'number') {
return DynamicValue.fromInvalidExpressionType(node, rhs);
}
return this.accessHelper(node, lhs, rhs, context);
}
private visitPropertyAccessExpression(node: ts.PropertyAccessExpression, context: Context):
ResolvedValue {
const lhs = this.visitExpression(node.expression, context);
const rhs = node.name.text;
// TODO: handle reference to class declaration.
if (lhs instanceof DynamicValue) {
return DynamicValue.fromDynamicInput(node, lhs);
}
return this.accessHelper(node, lhs, rhs, context);
}
private visitSourceFile(node: ts.SourceFile, context: Context): ResolvedValue {
const declarations = this.host.getExportsOfModule(node);
if (declarations === null) {
return DynamicValue.fromUnknown(node);
}
const map = new Map<string, ResolvedValue>();
declarations.forEach((decl, name) => {
const declContext = {
...context, ...joinModuleContext(context, node, decl),
};
// Visit both concrete and inline declarations.
// TODO(alxhub): remove cast once TS is upgraded in g3.
const value = decl.node !== null ?
this.visitDeclaration(decl.node, declContext) :
this.visitExpression((decl as InlineDeclaration).expression, declContext);
map.set(name, value);
});
return map;
}
private accessHelper(
node: ts.Expression, lhs: ResolvedValue, rhs: string|number,
context: Context): ResolvedValue {
const strIndex = `${rhs}`;
if (lhs instanceof Map) {
if (lhs.has(strIndex)) {
return lhs.get(strIndex) !;
} else {
return undefined;
}
} else if (Array.isArray(lhs)) {
if (rhs === 'length') {
return lhs.length;
} else if (rhs === 'slice') {
return new ArraySliceBuiltinFn(node, lhs);
} else if (rhs === 'concat') {
return new ArrayConcatBuiltinFn(node, lhs);
}
if (typeof rhs !== 'number' || !Number.isInteger(rhs)) {
return DynamicValue.fromInvalidExpressionType(node, rhs);
}
return lhs[rhs];
} else if (lhs instanceof Reference) {
const ref = lhs.node;
if (this.host.isClass(ref)) {
const module = owningModule(context, lhs.bestGuessOwningModule);
let value: ResolvedValue = undefined;
const member = this.host.getMembersOfClass(ref).find(
member => member.isStatic && member.name === strIndex);
if (member !== undefined) {
if (member.value !== null) {
value = this.visitExpression(member.value, context);
} else if (member.implementation !== null) {
value = new Reference(member.implementation, module);
} else if (member.node) {
value = new Reference(member.node, module);
}
}
return value;
} else if (isDeclaration(ref)) {
return DynamicValue.fromDynamicInput(
node, DynamicValue.fromExternalReference(ref, lhs as Reference<ts.Declaration>));
}
} else if (lhs instanceof DynamicValue) {
return DynamicValue.fromDynamicInput(node, lhs);
}
return DynamicValue.fromUnknown(node);
}
private visitCallExpression(node: ts.CallExpression, context: Context): ResolvedValue {
const lhs = this.visitExpression(node.expression, context);
if (lhs instanceof DynamicValue) {
return DynamicValue.fromDynamicInput(node, lhs);
}
// If the call refers to a builtin function, attempt to evaluate the function.
if (lhs instanceof BuiltinFn) {
return lhs.evaluate(this.evaluateFunctionArguments(node, context));
}
if (!(lhs instanceof Reference)) {
return DynamicValue.fromInvalidExpressionType(node.expression, lhs);
}
const fn = this.host.getDefinitionOfFunction(lhs.node);
if (fn === null) {
return DynamicValue.fromInvalidExpressionType(node.expression, lhs);
}
// If the function corresponds with a tslib helper function, evaluate it with custom logic.
if (fn.helper !== null) {
const args = this.evaluateFunctionArguments(node, context);
return evaluateTsHelperInline(fn.helper, node, args);
}
if (!isFunctionOrMethodReference(lhs)) {
return DynamicValue.fromInvalidExpressionType(node.expression, lhs);
}
// If the function is foreign (declared through a d.ts file), attempt to resolve it with the
// foreignFunctionResolver, if one is specified.
if (fn.body === null) {
let expr: ts.Expression|null = null;
if (context.foreignFunctionResolver) {
expr = context.foreignFunctionResolver(lhs, node.arguments);
}
if (expr === null) {
return DynamicValue.fromDynamicInput(
node, DynamicValue.fromExternalReference(node.expression, lhs));
}
// If the function is declared in a different file, resolve the foreign function expression
// using the absolute module name of that file (if any).
if (lhs.bestGuessOwningModule !== null) {
context = {
...context,
absoluteModuleName: lhs.bestGuessOwningModule.specifier,
resolutionContext: node.getSourceFile().fileName,
};
}
const res = this.visitExpression(expr, context);
if (res instanceof Reference) {
// This Reference was created synthetically, via a foreign function resolver. The real
// runtime value of the function expression may be different than the foreign function
// resolved value, so mark the Reference as synthetic to avoid it being misinterpreted.
res.synthetic = true;
}
return res;
}
const body = fn.body;
if (body.length !== 1 || !ts.isReturnStatement(body[0])) {
return DynamicValue.fromUnknown(node);
}
const ret = body[0] as ts.ReturnStatement;
const args = this.evaluateFunctionArguments(node, context);
const newScope: Scope = new Map<ts.ParameterDeclaration, ResolvedValue>();
const calleeContext = {...context, scope: newScope};
fn.parameters.forEach((param, index) => {
let arg = args[index];
if (param.node.dotDotDotToken !== undefined) {
arg = args.slice(index);
}
if (arg === undefined && param.initializer !== null) {
arg = this.visitExpression(param.initializer, calleeContext);
}
newScope.set(param.node, arg);
});
return ret.expression !== undefined ? this.visitExpression(ret.expression, calleeContext) :
undefined;
}
private visitConditionalExpression(node: ts.ConditionalExpression, context: Context):
ResolvedValue {
const condition = this.visitExpression(node.condition, context);
if (condition instanceof DynamicValue) {
return DynamicValue.fromDynamicInput(node, condition);
}
if (condition) {
return this.visitExpression(node.whenTrue, context);
} else {
return this.visitExpression(node.whenFalse, context);
}
}
private visitPrefixUnaryExpression(node: ts.PrefixUnaryExpression, context: Context):
ResolvedValue {
const operatorKind = node.operator;
if (!UNARY_OPERATORS.has(operatorKind)) {
return DynamicValue.fromUnsupportedSyntax(node);
}
const op = UNARY_OPERATORS.get(operatorKind) !;
const value = this.visitExpression(node.operand, context);
if (value instanceof DynamicValue) {
return DynamicValue.fromDynamicInput(node, value);
} else {
return op(value);
}
}
private visitBinaryExpression(node: ts.BinaryExpression, context: Context): ResolvedValue {
const tokenKind = node.operatorToken.kind;
if (!BINARY_OPERATORS.has(tokenKind)) {
return DynamicValue.fromUnsupportedSyntax(node);
}
const opRecord = BINARY_OPERATORS.get(tokenKind) !;
let lhs: ResolvedValue, rhs: ResolvedValue;
if (opRecord.literal) {
lhs = literal(this.visitExpression(node.left, context), node.left);
rhs = literal(this.visitExpression(node.right, context), node.right);
} else {
lhs = this.visitExpression(node.left, context);
rhs = this.visitExpression(node.right, context);
}
if (lhs instanceof DynamicValue) {
return DynamicValue.fromDynamicInput(node, lhs);
} else if (rhs instanceof DynamicValue) {
return DynamicValue.fromDynamicInput(node, rhs);
} else {
return opRecord.op(lhs, rhs);
}
}
private visitParenthesizedExpression(node: ts.ParenthesizedExpression, context: Context):
ResolvedValue {
return this.visitExpression(node.expression, context);
}
private evaluateFunctionArguments(node: ts.CallExpression, context: Context): ResolvedValueArray {
const args: ResolvedValueArray = [];
for (const arg of node.arguments) {
if (ts.isSpreadElement(arg)) {
args.push(...this.visitSpreadElement(arg, context));
} else {
args.push(this.visitExpression(arg, context));
}
}
return args;
}
private visitSpreadElement(node: ts.SpreadElement, context: Context): ResolvedValueArray {
const spread = this.visitExpression(node.expression, context);
if (spread instanceof DynamicValue) {
return [DynamicValue.fromDynamicInput(node, spread)];
} else if (!Array.isArray(spread)) {
return [DynamicValue.fromInvalidExpressionType(node, spread)];
} else {
return spread;
}
}
private stringNameFromPropertyName(node: ts.PropertyName, context: Context): string|undefined {
if (ts.isIdentifier(node) || ts.isStringLiteral(node) || ts.isNumericLiteral(node)) {
return node.text;
} else { // ts.ComputedPropertyName
const literal = this.visitExpression(node.expression, context);
return typeof literal === 'string' ? literal : undefined;
}
}
private getReference(node: ts.Declaration, context: Context): Reference {
return new Reference(node, owningModule(context));
}
}
function isFunctionOrMethodReference(ref: Reference<ts.Node>):
ref is Reference<ts.FunctionDeclaration|ts.MethodDeclaration|ts.FunctionExpression> {
return ts.isFunctionDeclaration(ref.node) || ts.isMethodDeclaration(ref.node) ||
ts.isFunctionExpression(ref.node);
}
function literal(value: ResolvedValue, node: ts.Node): any {
if (value instanceof DynamicValue || value === null || value === undefined ||
typeof value === 'string' || typeof value === 'number' || typeof value === 'boolean') {
return value;
}
return DynamicValue.fromInvalidExpressionType(node, value);
}
function isVariableDeclarationDeclared(node: ts.VariableDeclaration): boolean {
if (node.parent === undefined || !ts.isVariableDeclarationList(node.parent)) {
return false;
}
const declList = node.parent;
if (declList.parent === undefined || !ts.isVariableStatement(declList.parent)) {
return false;
}
const varStmt = declList.parent;
return varStmt.modifiers !== undefined &&
varStmt.modifiers.some(mod => mod.kind === ts.SyntaxKind.DeclareKeyword);
}
const EMPTY = {};
function joinModuleContext(existing: Context, node: ts.Node, decl: Declaration): {
absoluteModuleName?: string,
resolutionContext?: string,
} {
if (decl.viaModule !== null && decl.viaModule !== existing.absoluteModuleName) {
return {
absoluteModuleName: decl.viaModule,
resolutionContext: node.getSourceFile().fileName,
};
} else {
return EMPTY;
}
}
function owningModule(context: Context, override: OwningModule | null = null): OwningModule|null {
let specifier = context.absoluteModuleName;
if (override !== null) {
specifier = override.specifier;
}
if (specifier !== null) {
return {
specifier,
resolutionContext: context.resolutionContext,
};
} else {
return null;
}
}