angular-cn/modules/@angular/compiler/test/expression_parser/parser_spec.ts

import {AST, BindingPipe} from '@angular/compiler/src/expression_parser/ast';
import {Lexer} from '@angular/compiler/src/expression_parser/lexer';
import {Parser} from '@angular/compiler/src/expression_parser/parser';
import {beforeEach, ddescribe, describe, expect, iit, it, xit} from '@angular/core/testing';

import {isBlank, isPresent} from '../../src/facade/lang';

import {Unparser} from './unparser';

export function main() {
  function createParser() { return new Parser(new Lexer()); }

  function parseAction(text: string, location: any = null): any {
    return createParser().parseAction(text, location);
  }

  function parseBinding(text: string, location: any = null): any {
    return createParser().parseBinding(text, location);
  }

  function parseTemplateBindings(text: string, location: any = null): any {
    return createParser().parseTemplateBindings(text, location).templateBindings;
  }

  function parseInterpolation(text: string, location: any = null): any {
    return createParser().parseInterpolation(text, location);
  }

  function parseSimpleBinding(text: string, location: any = null): any {
    return createParser().parseSimpleBinding(text, location);
  }

  function unparse(ast: AST): string { return new Unparser().unparse(ast); }

  function checkInterpolation(exp: string, expected?: string) {
    var ast = parseInterpolation(exp);
    if (isBlank(expected)) expected = exp;
    expect(unparse(ast)).toEqual(expected);
  }

  function checkBinding(exp: string, expected?: string) {
    var ast = parseBinding(exp);
    if (isBlank(expected)) expected = exp;
    expect(unparse(ast)).toEqual(expected);
  }

  function checkAction(exp: string, expected?: string) {
    var ast = parseAction(exp);
    if (isBlank(expected)) expected = exp;
    expect(unparse(ast)).toEqual(expected);
  }

  function expectActionError(text: any /** TODO #9100 */) {
    return expect(() => parseAction(text));
  }

  function expectBindingError(text: any /** TODO #9100 */) {
    return expect(() => parseBinding(text));
  }

  describe('parser', () => {
    describe('parseAction', () => {
      it('should parse numbers', () => { checkAction('1'); });

      it('should parse strings', () => {
        checkAction('\'1\'', '"1"');
        checkAction('"1"');
      });

      it('should parse null', () => { checkAction('null'); });

      it('should parse unary - expressions', () => {
        checkAction('-1', '0 - 1');
        checkAction('+1', '1');
      });

      it('should parse unary ! expressions', () => {
        checkAction('!true');
        checkAction('!!true');
        checkAction('!!!true');
      });

      it('should parse multiplicative expressions',
         () => { checkAction('3*4/2%5', '3 * 4 / 2 % 5'); });

      it('should parse additive expressions', () => { checkAction('3 + 6 - 2'); });

      it('should parse relational expressions', () => {
        checkAction('2 < 3');
        checkAction('2 > 3');
        checkAction('2 <= 2');
        checkAction('2 >= 2');
      });

      it('should parse equality expressions', () => {
        checkAction('2 == 3');
        checkAction('2 != 3');
      });

      it('should parse strict equality expressions', () => {
        checkAction('2 === 3');
        checkAction('2 !== 3');
      });

      it('should parse expressions', () => {
        checkAction('true && true');
        checkAction('true || false');
      });

      it('should parse grouped expressions', () => { checkAction('(1 + 2) * 3', '1 + 2 * 3'); });

      it('should ignore comments in expressions', () => { checkAction('a //comment', 'a'); });

      it('should retain // in string literals',
         () => { checkAction(`"http://www.google.com"`, `"http://www.google.com"`); });

      it('should parse an empty string', () => { checkAction(''); });

      describe('literals', () => {
        it('should parse array', () => {
          checkAction('[1][0]');
          checkAction('[[1]][0][0]');
          checkAction('[]');
          checkAction('[].length');
          checkAction('[1, 2].length');
        });

        it('should parse map', () => {
          checkAction('{}');
          checkAction('{a: 1}[2]');
          checkAction('{}["a"]');
        });

        it('should only allow identifier, string, or keyword as map key', () => {
          expectActionError('{(:0}').toThrowError(/expected identifier, keyword, or string/);
          expectActionError('{1234:0}').toThrowError(/expected identifier, keyword, or string/);
        });
      });

      describe('member access', () => {
        it('should parse field access', () => {
          checkAction('a');
          checkAction('a.a');
        });

        it('should only allow identifier or keyword as member names', () => {
          expectActionError('x.(').toThrowError(/identifier or keyword/);
          expectActionError('x. 1234').toThrowError(/identifier or keyword/);
          expectActionError('x."foo"').toThrowError(/identifier or keyword/);
        });

        it('should parse safe field access', () => {
          checkAction('a?.a');
          checkAction('a.a?.a');
        });
      });

      describe('method calls', () => {
        it('should parse method calls', () => {
          checkAction('fn()');
          checkAction('add(1, 2)');
          checkAction('a.add(1, 2)');
          checkAction('fn().add(1, 2)');
        });
      });

      describe('functional calls', () => {
        it('should parse function calls', () => { checkAction('fn()(1, 2)'); });
      });

      describe('conditional', () => {
        it('should parse ternary/conditional expressions', () => {
          checkAction('7 == 3 + 4 ? 10 : 20');
          checkAction('false ? 10 : 20');
        });

        it('should throw on incorrect ternary operator syntax', () => {
          expectActionError('true?1').toThrowError(
              /Parser Error: Conditional expression true\?1 requires all 3 expressions/);
        });
      });

      describe('assignment', () => {
        it('should support field assignments', () => {
          checkAction('a = 12');
          checkAction('a.a.a = 123');
          checkAction('a = 123; b = 234;');
        });

        it('should throw on safe field assignments', () => {
          expectActionError('a?.a = 123').toThrowError(/cannot be used in the assignment/);
        });

        it('should support array updates', () => { checkAction('a[0] = 200'); });
      });

      it('should error when using pipes',
         () => { expectActionError('x|blah').toThrowError(/Cannot have a pipe/); });

      it('should store the source in the result',
         () => { expect(parseAction('someExpr').source).toBe('someExpr'); });

      it('should store the passed-in location',
         () => { expect(parseAction('someExpr', 'location').location).toBe('location'); });

      it('should throw when encountering interpolation', () => {
        expectActionError('{{a()}}').toThrowError(
            /Got interpolation \(\{\{\}\}\) where expression was expected/);
      });
    });

    describe('general error handling', () => {
      it('should throw on an unexpected token',
         () => { expectActionError('[1,2] trac').toThrowError(/Unexpected token \'trac\'/); });

      it('should throw a reasonable error for unconsumed tokens', () => {
        expectActionError(')').toThrowError(/Unexpected token \) at column 1 in \[\)\]/);
      });

      it('should throw on missing expected token', () => {
        expectActionError('a(b').toThrowError(
            /Missing expected \) at the end of the expression \[a\(b\]/);
      });
    });

    describe('parseBinding', () => {
      describe('pipes', () => {
        it('should parse pipes', () => {
          checkBinding('a(b | c)', 'a((b | c))');
          checkBinding('a.b(c.d(e) | f)', 'a.b((c.d(e) | f))');
          checkBinding('[1, 2, 3] | a', '([1, 2, 3] | a)');
          checkBinding('{a: 1} | b', '({a: 1} | b)');
          checkBinding('a[b] | c', '(a[b] | c)');
          checkBinding('a?.b | c', '(a?.b | c)');
          checkBinding('true | a', '(true | a)');
          checkBinding('a | b:c | d', '((a | b:c) | d)');
          checkBinding('a | b:(c | d)', '(a | b:(c | d))');
        });

        it('should only allow identifier or keyword as formatter names', () => {
          expectBindingError('"Foo"|(').toThrowError(/identifier or keyword/);
          expectBindingError('"Foo"|1234').toThrowError(/identifier or keyword/);
          expectBindingError('"Foo"|"uppercase"').toThrowError(/identifier or keyword/);
        });

        it('should parse quoted expressions', () => { checkBinding('a:b', 'a:b'); });

        it('should not crash when prefix part is not tokenizable',
           () => { checkBinding('"a:b"', '"a:b"'); });

        it('should ignore whitespace around quote prefix', () => { checkBinding(' a :b', 'a:b'); });

        it('should refuse prefixes that are not single identifiers', () => {
          expectBindingError('a + b:c').toThrowError();
          expectBindingError('1:c').toThrowError();
        });
      });

      it('should store the source in the result',
         () => { expect(parseBinding('someExpr').source).toBe('someExpr'); });

      it('should store the passed-in location',
         () => { expect(parseBinding('someExpr', 'location').location).toBe('location'); });

      it('should throw on chain expressions',
         () => { expect(() => parseBinding('1;2')).toThrowError(/contain chained expression/); });

      it('should throw on assignment',
         () => { expect(() => parseBinding('a=2')).toThrowError(/contain assignments/); });

      it('should throw when encountering interpolation', () => {
        expectBindingError('{{a.b}}').toThrowError(
            /Got interpolation \(\{\{\}\}\) where expression was expected/);
      });

      it('should parse conditional expression', () => { checkBinding('a < b ? a : b'); });

      it('should ignore comments in bindings', () => { checkBinding('a //comment', 'a'); });

      it('should retain // in string literals',
         () => { checkBinding(`"http://www.google.com"`, `"http://www.google.com"`); });

      it('should retain // in : microsyntax', () => { checkBinding('one:a//b', 'one:a//b'); });

    });

    describe('parseTemplateBindings', () => {

      function keys(templateBindings: any[]) {
        return templateBindings.map(binding => binding.key);
      }

      function keyValues(templateBindings: any[]) {
        return templateBindings.map(binding => {
          if (binding.keyIsVar) {
            return 'let ' + binding.key + (isBlank(binding.name) ? '=null' : '=' + binding.name);
          } else {
            return binding.key + (isBlank(binding.expression) ? '' : `=${binding.expression}`)
          }
        });
      }

      function exprSources(templateBindings: any[]) {
        return templateBindings.map(
            binding => isPresent(binding.expression) ? binding.expression.source : null);
      }

      it('should parse an empty string', () => { expect(parseTemplateBindings('')).toEqual([]); });

      it('should parse a string without a value',
         () => { expect(keys(parseTemplateBindings('a'))).toEqual(['a']); });

      it('should only allow identifier, string, or keyword including dashes as keys', () => {
        var bindings = parseTemplateBindings('a:\'b\'');
        expect(keys(bindings)).toEqual(['a']);

        bindings = parseTemplateBindings('\'a\':\'b\'');
        expect(keys(bindings)).toEqual(['a']);

        bindings = parseTemplateBindings('"a":\'b\'');
        expect(keys(bindings)).toEqual(['a']);

        bindings = parseTemplateBindings('a-b:\'c\'');
        expect(keys(bindings)).toEqual(['a-b']);

        expect(() => {
          parseTemplateBindings('(:0');
        }).toThrowError(/expected identifier, keyword, or string/);

        expect(() => {
          parseTemplateBindings('1234:0');
        }).toThrowError(/expected identifier, keyword, or string/);
      });

      it('should detect expressions as value', () => {
        var bindings = parseTemplateBindings('a:b');
        expect(exprSources(bindings)).toEqual(['b']);

        bindings = parseTemplateBindings('a:1+1');
        expect(exprSources(bindings)).toEqual(['1+1']);
      });

      it('should detect names as value', () => {
        var bindings = parseTemplateBindings('a:let b');
        expect(keyValues(bindings)).toEqual(['a', 'let b=\$implicit']);
      });

      it('should allow space and colon as separators', () => {
        var bindings = parseTemplateBindings('a:b');
        expect(keys(bindings)).toEqual(['a']);
        expect(exprSources(bindings)).toEqual(['b']);

        bindings = parseTemplateBindings('a b');
        expect(keys(bindings)).toEqual(['a']);
        expect(exprSources(bindings)).toEqual(['b']);
      });

      it('should allow multiple pairs', () => {
        var bindings = parseTemplateBindings('a 1 b 2');
        expect(keys(bindings)).toEqual(['a', 'aB']);
        expect(exprSources(bindings)).toEqual(['1 ', '2']);
      });

      it('should store the sources in the result', () => {
        var bindings = parseTemplateBindings('a 1,b 2');
        expect(bindings[0].expression.source).toEqual('1');
        expect(bindings[1].expression.source).toEqual('2');
      });

      it('should store the passed-in location', () => {
        var bindings = parseTemplateBindings('a 1,b 2', 'location');
        expect(bindings[0].expression.location).toEqual('location');
      });

      it('should support var notation with a deprecation warning', () => {
        var bindings = createParser().parseTemplateBindings('var i', null);
        expect(keyValues(bindings.templateBindings)).toEqual(['let i=\$implicit']);
        expect(bindings.warnings).toEqual([
          '"var" inside of expressions is deprecated. Use "let" instead!'
        ]);
      });

      it('should support # notation with a deprecation warning', () => {
        var bindings = createParser().parseTemplateBindings('#i', null);
        expect(keyValues(bindings.templateBindings)).toEqual(['let i=\$implicit']);
        expect(bindings.warnings).toEqual([
          '"#" inside of expressions is deprecated. Use "let" instead!'
        ]);
      });

      it('should support let notation', () => {
        var bindings = parseTemplateBindings('let i');
        expect(keyValues(bindings)).toEqual(['let i=\$implicit']);

        bindings = parseTemplateBindings('let i');
        expect(keyValues(bindings)).toEqual(['let i=\$implicit']);

        bindings = parseTemplateBindings('let a; let b');
        expect(keyValues(bindings)).toEqual(['let a=\$implicit', 'let b=\$implicit']);

        bindings = parseTemplateBindings('let a; let b;');
        expect(keyValues(bindings)).toEqual(['let a=\$implicit', 'let b=\$implicit']);

        bindings = parseTemplateBindings('let i-a = k-a');
        expect(keyValues(bindings)).toEqual(['let i-a=k-a']);

        bindings = parseTemplateBindings('keyword let item; let i = k');
        expect(keyValues(bindings)).toEqual(['keyword', 'let item=\$implicit', 'let i=k']);

        bindings = parseTemplateBindings('keyword: let item; let i = k');
        expect(keyValues(bindings)).toEqual(['keyword', 'let item=\$implicit', 'let i=k']);

        bindings = parseTemplateBindings('directive: let item in expr; let a = b', 'location');
        expect(keyValues(bindings)).toEqual([
          'directive', 'let item=\$implicit', 'directiveIn=expr in location', 'let a=b'
        ]);
      });

      it('should parse pipes', () => {
        var bindings = parseTemplateBindings('key value|pipe');
        var ast = bindings[0].expression.ast;
        expect(ast).toBeAnInstanceOf(BindingPipe);
      });
    });

    describe('parseInterpolation', () => {
      it('should return null if no interpolation',
         () => { expect(parseInterpolation('nothing')).toBe(null); });

      it('should parse no prefix/suffix interpolation', () => {
        var ast = parseInterpolation('{{a}}').ast;
        expect(ast.strings).toEqual(['', '']);
        expect(ast.expressions.length).toEqual(1);
        expect(ast.expressions[0].name).toEqual('a');
      });

      it('should parse prefix/suffix with multiple interpolation', () => {
        var originalExp = 'before {{ a }} middle {{ b }} after';
        var ast = parseInterpolation(originalExp).ast;
        expect(new Unparser().unparse(ast)).toEqual(originalExp);
      });

      it('should throw on empty interpolation expressions', () => {
        expect(() => parseInterpolation('{{}}'))
            .toThrowError(
                /Parser Error: Blank expressions are not allowed in interpolated strings/);

        expect(() => parseInterpolation('foo {{  }}'))
            .toThrowError(
                /Parser Error: Blank expressions are not allowed in interpolated strings/);
      });

      it('should parse conditional expression',
         () => { checkInterpolation('{{ a < b ? a : b }}'); });

      it('should parse expression with newline characters', () => {
        checkInterpolation(`{{ 'foo' +\n 'bar' +\r 'baz' }}`, `{{ "foo" + "bar" + "baz" }}`);
      });

      it('should support custom interpolation', () => {
        const parser = new Parser(new Lexer());
        const ast = parser.parseInterpolation('{% a %}', null, {start: '{%', end: '%}'}).ast as any;
        expect(ast.strings).toEqual(['', '']);
        expect(ast.expressions.length).toEqual(1);
        expect(ast.expressions[0].name).toEqual('a');
      });

      describe('comments', () => {
        it('should ignore comments in interpolation expressions',
           () => { checkInterpolation('{{a //comment}}', '{{ a }}'); });

        it('should retain // in single quote strings', () => {
          checkInterpolation(`{{ 'http://www.google.com' }}`, `{{ "http://www.google.com" }}`);
        });

        it('should retain // in double quote strings', () => {
          checkInterpolation(`{{ "http://www.google.com" }}`, `{{ "http://www.google.com" }}`);
        });

        it('should ignore comments after string literals',
           () => { checkInterpolation(`{{ "a//b" //comment }}`, `{{ "a//b" }}`); });

        it('should retain // in complex strings', () => {
          checkInterpolation(
              `{{"//a\'//b\`//c\`//d\'//e" //comment}}`, `{{ "//a\'//b\`//c\`//d\'//e" }}`);
        });

        it('should retain // in nested, unterminated strings',
           () => { checkInterpolation(`{{ "a\'b\`" //comment}}`, `{{ "a\'b\`" }}`); });
      });

    });

    describe('parseSimpleBinding', () => {
      it('should parse a field access', () => {
        var p = parseSimpleBinding('name');
        expect(unparse(p)).toEqual('name');
      });

      it('should parse a constant', () => {
        var p = parseSimpleBinding('[1, 2]');
        expect(unparse(p)).toEqual('[1, 2]');
      });

      it('should throw when the given expression is not just a field name', () => {
        expect(() => parseSimpleBinding('name + 1'))
            .toThrowError(/Host binding expression can only contain field access and constants/);
      });

      it('should throw when encountering interpolation', () => {
        expect(() => parseSimpleBinding('{{exp}}'))
            .toThrowError(/Got interpolation \(\{\{\}\}\) where expression was expected/);
      });
    });

    describe('wrapLiteralPrimitive', () => {
      it('should wrap a literal primitive', () => {
        expect(unparse(createParser().wrapLiteralPrimitive('foo', null))).toEqual('"foo"');
      });
    });
  });
}