249 lines
8.8 KiB
TypeScript
249 lines
8.8 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {Lexer, Token} from '@angular/compiler/src/expression_parser/lexer';
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function lex(text: string): any[] {
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return new Lexer().tokenize(text);
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}
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function expectToken(token: any, index: number) {
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expect(token instanceof Token).toBe(true);
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expect(token.index).toEqual(index);
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}
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function expectCharacterToken(token: any, index: number, character: string) {
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expect(character.length).toBe(1);
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expectToken(token, index);
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expect(token.isCharacter(character.charCodeAt(0))).toBe(true);
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}
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function expectOperatorToken(token: any, index: number, operator: string) {
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expectToken(token, index);
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expect(token.isOperator(operator)).toBe(true);
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}
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function expectNumberToken(token: any, index: number, n: number) {
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expectToken(token, index);
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expect(token.isNumber()).toBe(true);
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expect(token.toNumber()).toEqual(n);
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}
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function expectStringToken(token: any, index: number, str: string) {
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expectToken(token, index);
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expect(token.isString()).toBe(true);
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expect(token.toString()).toEqual(str);
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}
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function expectIdentifierToken(token: any, index: number, identifier: string) {
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expectToken(token, index);
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expect(token.isIdentifier()).toBe(true);
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expect(token.toString()).toEqual(identifier);
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}
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function expectKeywordToken(token: any, index: number, keyword: string) {
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expectToken(token, index);
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expect(token.isKeyword()).toBe(true);
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expect(token.toString()).toEqual(keyword);
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}
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function expectErrorToken(token: Token, index: any, message: string) {
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expectToken(token, index);
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expect(token.isError()).toBe(true);
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expect(token.toString()).toEqual(message);
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}
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export function main() {
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describe('lexer', () => {
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describe('token', () => {
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it('should tokenize a simple identifier', () => {
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var tokens: number[] = lex('j');
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expect(tokens.length).toEqual(1);
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expectIdentifierToken(tokens[0], 0, 'j');
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});
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it('should tokenize "this"', () => {
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var tokens: number[] = lex('this');
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expect(tokens.length).toEqual(1);
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expectKeywordToken(tokens[0], 0, 'this');
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});
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it('should tokenize a dotted identifier', () => {
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var tokens: number[] = lex('j.k');
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expect(tokens.length).toEqual(3);
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expectIdentifierToken(tokens[0], 0, 'j');
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expectCharacterToken(tokens[1], 1, '.');
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expectIdentifierToken(tokens[2], 2, 'k');
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});
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it('should tokenize an operator', () => {
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var tokens: number[] = lex('j-k');
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expect(tokens.length).toEqual(3);
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expectOperatorToken(tokens[1], 1, '-');
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});
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it('should tokenize an indexed operator', () => {
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var tokens: number[] = lex('j[k]');
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expect(tokens.length).toEqual(4);
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expectCharacterToken(tokens[1], 1, '[');
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expectCharacterToken(tokens[3], 3, ']');
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});
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it('should tokenize numbers', () => {
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var tokens: number[] = lex('88');
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expect(tokens.length).toEqual(1);
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expectNumberToken(tokens[0], 0, 88);
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});
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it('should tokenize numbers within index ops',
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() => { expectNumberToken(lex('a[22]')[2], 2, 22); });
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it('should tokenize simple quoted strings',
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() => { expectStringToken(lex('"a"')[0], 0, 'a'); });
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it('should tokenize quoted strings with escaped quotes',
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() => { expectStringToken(lex('"a\\""')[0], 0, 'a"'); });
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it('should tokenize a string', () => {
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var tokens: Token[] = lex('j-a.bc[22]+1.3|f:\'a\\\'c\':"d\\"e"');
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expectIdentifierToken(tokens[0], 0, 'j');
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expectOperatorToken(tokens[1], 1, '-');
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expectIdentifierToken(tokens[2], 2, 'a');
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expectCharacterToken(tokens[3], 3, '.');
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expectIdentifierToken(tokens[4], 4, 'bc');
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expectCharacterToken(tokens[5], 6, '[');
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expectNumberToken(tokens[6], 7, 22);
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expectCharacterToken(tokens[7], 9, ']');
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expectOperatorToken(tokens[8], 10, '+');
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expectNumberToken(tokens[9], 11, 1.3);
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expectOperatorToken(tokens[10], 14, '|');
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expectIdentifierToken(tokens[11], 15, 'f');
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expectCharacterToken(tokens[12], 16, ':');
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expectStringToken(tokens[13], 17, 'a\'c');
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expectCharacterToken(tokens[14], 23, ':');
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expectStringToken(tokens[15], 24, 'd"e');
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});
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it('should tokenize undefined', () => {
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var tokens: Token[] = lex('undefined');
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expectKeywordToken(tokens[0], 0, 'undefined');
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expect(tokens[0].isKeywordUndefined()).toBe(true);
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});
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it('should ignore whitespace', () => {
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var tokens: Token[] = lex('a \t \n \r b');
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expectIdentifierToken(tokens[0], 0, 'a');
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expectIdentifierToken(tokens[1], 8, 'b');
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});
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it('should tokenize quoted string', () => {
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var str = '[\'\\\'\', "\\""]';
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var tokens: Token[] = lex(str);
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expectStringToken(tokens[1], 1, '\'');
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expectStringToken(tokens[3], 7, '"');
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});
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it('should tokenize escaped quoted string', () => {
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var str = '"\\"\\n\\f\\r\\t\\v\\u00A0"';
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var tokens: Token[] = lex(str);
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expect(tokens.length).toEqual(1);
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expect(tokens[0].toString()).toEqual('"\n\f\r\t\v\u00A0');
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});
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it('should tokenize unicode', () => {
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var tokens: Token[] = lex('"\\u00A0"');
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expect(tokens.length).toEqual(1);
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expect(tokens[0].toString()).toEqual('\u00a0');
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});
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it('should tokenize relation', () => {
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var tokens: Token[] = lex('! == != < > <= >= === !==');
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expectOperatorToken(tokens[0], 0, '!');
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expectOperatorToken(tokens[1], 2, '==');
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expectOperatorToken(tokens[2], 5, '!=');
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expectOperatorToken(tokens[3], 8, '<');
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expectOperatorToken(tokens[4], 10, '>');
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expectOperatorToken(tokens[5], 12, '<=');
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expectOperatorToken(tokens[6], 15, '>=');
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expectOperatorToken(tokens[7], 18, '===');
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expectOperatorToken(tokens[8], 22, '!==');
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});
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it('should tokenize statements', () => {
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var tokens: Token[] = lex('a;b;');
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expectIdentifierToken(tokens[0], 0, 'a');
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expectCharacterToken(tokens[1], 1, ';');
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expectIdentifierToken(tokens[2], 2, 'b');
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expectCharacterToken(tokens[3], 3, ';');
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});
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it('should tokenize function invocation', () => {
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var tokens: Token[] = lex('a()');
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expectIdentifierToken(tokens[0], 0, 'a');
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expectCharacterToken(tokens[1], 1, '(');
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expectCharacterToken(tokens[2], 2, ')');
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});
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it('should tokenize simple method invocations', () => {
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var tokens: Token[] = lex('a.method()');
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expectIdentifierToken(tokens[2], 2, 'method');
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});
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it('should tokenize method invocation', () => {
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var tokens: Token[] = lex('a.b.c (d) - e.f()');
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expectIdentifierToken(tokens[0], 0, 'a');
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expectCharacterToken(tokens[1], 1, '.');
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expectIdentifierToken(tokens[2], 2, 'b');
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expectCharacterToken(tokens[3], 3, '.');
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expectIdentifierToken(tokens[4], 4, 'c');
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expectCharacterToken(tokens[5], 6, '(');
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expectIdentifierToken(tokens[6], 7, 'd');
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expectCharacterToken(tokens[7], 8, ')');
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expectOperatorToken(tokens[8], 10, '-');
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expectIdentifierToken(tokens[9], 12, 'e');
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expectCharacterToken(tokens[10], 13, '.');
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expectIdentifierToken(tokens[11], 14, 'f');
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expectCharacterToken(tokens[12], 15, '(');
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expectCharacterToken(tokens[13], 16, ')');
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});
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it('should tokenize number', () => { expectNumberToken(lex('0.5')[0], 0, 0.5); });
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it('should tokenize number with exponent', () => {
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let tokens: Token[] = lex('0.5E-10');
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expect(tokens.length).toEqual(1);
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expectNumberToken(tokens[0], 0, 0.5E-10);
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tokens = lex('0.5E+10');
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expectNumberToken(tokens[0], 0, 0.5E+10);
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});
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it('should return exception for invalid exponent', () => {
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expectErrorToken(
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lex('0.5E-')[0], 4, 'Lexer Error: Invalid exponent at column 4 in expression [0.5E-]');
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expectErrorToken(
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lex('0.5E-A')[0], 4,
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'Lexer Error: Invalid exponent at column 4 in expression [0.5E-A]');
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});
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it('should tokenize number starting with a dot',
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() => { expectNumberToken(lex('.5')[0], 0, 0.5); });
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it('should throw error on invalid unicode', () => {
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expectErrorToken(
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lex('\'\\u1\'\'bla\'')[0], 2,
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'Lexer Error: Invalid unicode escape [\\u1\'\'b] at column 2 in expression [\'\\u1\'\'bla\']');
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});
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it('should tokenize hash as operator', () => { expectOperatorToken(lex('#')[0], 0, '#'); });
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it('should tokenize ?. as operator', () => { expectOperatorToken(lex('?.')[0], 0, '?.'); });
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});
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});
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}
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