feat(Parser): implement Parser
Add a simple parser implementation that supports only field reads.
This commit is contained in:
vsavkin
242
modules/change_detection/test/parser/lexer_spec.js
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242
modules/change_detection/test/parser/lexer_spec.js
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import {describe, it, expect} from 'test_lib/test_lib';
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import {Lexer, Token} from 'change_detection/parser/lexer';
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import {List, ListWrapper} from "facade/collection";
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import {StringWrapper, int} from "facade/lang";
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function lex(text:string):List {
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return new Lexer().tokenize(text);
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}
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function expectToken(token, index) {
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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, index, character) {
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expect(character.length).toBe(1);
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expectToken(token, index);
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expect(token.isCharacter(StringWrapper.charCodeAt(character, 0))).toBe(true);
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}
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function expectOperatorToken(token, index, operator) {
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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, index, n) {
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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, index, str) {
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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, index, identifier) {
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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, index, keyword) {
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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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export function main() {
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describe('lexer', function() {
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describe('token', function() {
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it('should tokenize a simple identifier', function() {
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var tokens:List<int> = 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 a dotted identifier', function() {
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var tokens:List<int> = 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', function() {
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var tokens:List<int> = 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', function() {
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var tokens:List<int> = 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', function() {
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var tokens:List<int> = 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', function() {
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expectNumberToken(lex("a[22]")[2], 2, 22);
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});
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it('should tokenize simple quoted strings', function() {
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expectStringToken(lex('"a"')[0], 0, "a");
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});
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it('should tokenize quoted strings with escaped quotes', function() {
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expectStringToken(lex('"a\\""')[0], 0, 'a"');
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});
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it('should tokenize a string', function() {
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var tokens:List<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', function() {
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var tokens:List<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', function() {
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var tokens:List<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', function() {
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var str = "['\\'', \"\\\"\"]";
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var tokens:List<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', function() {
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var str = '"\\"\\n\\f\\r\\t\\v\\u00A0"';
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var tokens:List<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', function() {
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var tokens:List<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', function() {
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var tokens:List<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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});
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it('should tokenize statements', function() {
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var tokens:List<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', function() {
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var tokens:List<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', function() {
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var tokens:List<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', function() {
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var tokens:List<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', function() {
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var tokens:List<Token> = lex("0.5");
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expectNumberToken(tokens[0], 0, 0.5);
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});
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// NOTE(deboer): NOT A LEXER TEST
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// it('should tokenize negative number', function() {
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// var tokens:List<Token> = lex("-0.5");
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// expectNumberToken(tokens[0], 0, -0.5);
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// });
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it('should tokenize number with exponent', function() {
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var tokens:List<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 throws exception for invalid exponent', function() {
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expect(function() {
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lex("0.5E-");
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}).toThrowError('Lexer Error: Invalid exponent at column 4 in expression [0.5E-]');
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expect(function() {
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lex("0.5E-A");
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}).toThrowError('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', function() {
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var tokens:List<Token> = lex(".5");
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expectNumberToken(tokens[0], 0, 0.5);
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});
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it('should throw error on invalid unicode', function() {
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expect(function() {
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lex("'\\u1''bla'");
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}).toThrowError("Lexer Error: Invalid unicode escape [\\u1''b] at column 2 in expression ['\\u1''bla']");
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});
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});
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});
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}
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