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angular-cn/modules/@angular/compiler/test/css_parser/css_lexer_spec.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 {describe, expect, it} from '../../../core/testing/testing_internal';
import {CssLexer, CssLexerMode, CssScannerError, CssToken, CssTokenType} from '../../src/css_parser/css_lexer';
import {isPresent} from '../../src/facade/lang';
export function main() {
function tokenize(
code: string, trackComments: boolean = false,
mode: CssLexerMode = CssLexerMode.ALL): CssToken[] {
const scanner = new CssLexer().scan(code, trackComments);
scanner.setMode(mode);
var tokens: CssToken[] = [];
var output = scanner.scan();
while (output != null) {
var error = output.error;
if (isPresent(error)) {
throw new CssScannerError(error.token, error.rawMessage);
}
tokens.push(output.token);
output = scanner.scan();
}
return tokens;
}
describe('CssLexer', () => {
it('should lex newline characters as whitespace when whitespace mode is on', () => {
var newlines = ['\n', '\r\n', '\r', '\f'];
newlines.forEach((line) => {
var token = tokenize(line, false, CssLexerMode.ALL_TRACK_WS)[0];
expect(token.type).toEqual(CssTokenType.Whitespace);
});
});
it('should combined newline characters as one newline token when whitespace mode is on', () => {
var newlines = ['\n', '\r\n', '\r', '\f'].join('');
var tokens = tokenize(newlines, false, CssLexerMode.ALL_TRACK_WS);
expect(tokens.length).toEqual(1);
expect(tokens[0].type).toEqual(CssTokenType.Whitespace);
});
it('should not consider whitespace or newline values at all when whitespace mode is off',
() => {
var newlines = ['\n', '\r\n', '\r', '\f'].join('');
var tokens = tokenize(newlines);
expect(tokens.length).toEqual(0);
});
it('should lex simple selectors and their inner properties', () => {
var cssCode = '\n' +
' .selector { my-prop: my-value; }\n';
var tokens = tokenize(cssCode);
expect(tokens[0].type).toEqual(CssTokenType.Character);
expect(tokens[0].strValue).toEqual('.');
expect(tokens[1].type).toEqual(CssTokenType.Identifier);
expect(tokens[1].strValue).toEqual('selector');
expect(tokens[2].type).toEqual(CssTokenType.Character);
expect(tokens[2].strValue).toEqual('{');
expect(tokens[3].type).toEqual(CssTokenType.Identifier);
expect(tokens[3].strValue).toEqual('my-prop');
expect(tokens[4].type).toEqual(CssTokenType.Character);
expect(tokens[4].strValue).toEqual(':');
expect(tokens[5].type).toEqual(CssTokenType.Identifier);
expect(tokens[5].strValue).toEqual('my-value');
expect(tokens[6].type).toEqual(CssTokenType.Character);
expect(tokens[6].strValue).toEqual(';');
expect(tokens[7].type).toEqual(CssTokenType.Character);
expect(tokens[7].strValue).toEqual('}');
});
it('should capture the column and line values for each token', () => {
var cssCode = '#id {\n' +
' prop:value;\n' +
'}';
var tokens = tokenize(cssCode);
// #
expect(tokens[0].type).toEqual(CssTokenType.Character);
expect(tokens[0].column).toEqual(0);
expect(tokens[0].line).toEqual(0);
// id
expect(tokens[1].type).toEqual(CssTokenType.Identifier);
expect(tokens[1].column).toEqual(1);
expect(tokens[1].line).toEqual(0);
// {
expect(tokens[2].type).toEqual(CssTokenType.Character);
expect(tokens[2].column).toEqual(4);
expect(tokens[2].line).toEqual(0);
// prop
expect(tokens[3].type).toEqual(CssTokenType.Identifier);
expect(tokens[3].column).toEqual(2);
expect(tokens[3].line).toEqual(1);
// :
expect(tokens[4].type).toEqual(CssTokenType.Character);
expect(tokens[4].column).toEqual(6);
expect(tokens[4].line).toEqual(1);
// value
expect(tokens[5].type).toEqual(CssTokenType.Identifier);
expect(tokens[5].column).toEqual(7);
expect(tokens[5].line).toEqual(1);
// ;
expect(tokens[6].type).toEqual(CssTokenType.Character);
expect(tokens[6].column).toEqual(12);
expect(tokens[6].line).toEqual(1);
// }
expect(tokens[7].type).toEqual(CssTokenType.Character);
expect(tokens[7].column).toEqual(0);
expect(tokens[7].line).toEqual(2);
});
it('should lex quoted strings and escape accordingly', () => {
var cssCode = 'prop: \'some { value } \\\' that is quoted\'';
var tokens = tokenize(cssCode);
expect(tokens[0].type).toEqual(CssTokenType.Identifier);
expect(tokens[1].type).toEqual(CssTokenType.Character);
expect(tokens[2].type).toEqual(CssTokenType.String);
expect(tokens[2].strValue).toEqual('\'some { value } \\\' that is quoted\'');
});
it('should treat attribute operators as regular characters', () => {
tokenize('^|~+*').forEach((token) => { expect(token.type).toEqual(CssTokenType.Character); });
});
it('should lex numbers properly and set them as numbers', () => {
var cssCode = '0 1 -2 3.0 -4.001';
var tokens = tokenize(cssCode);
expect(tokens[0].type).toEqual(CssTokenType.Number);
expect(tokens[0].strValue).toEqual('0');
expect(tokens[1].type).toEqual(CssTokenType.Number);
expect(tokens[1].strValue).toEqual('1');
expect(tokens[2].type).toEqual(CssTokenType.Number);
expect(tokens[2].strValue).toEqual('-2');
expect(tokens[3].type).toEqual(CssTokenType.Number);
expect(tokens[3].strValue).toEqual('3.0');
expect(tokens[4].type).toEqual(CssTokenType.Number);
expect(tokens[4].strValue).toEqual('-4.001');
});
it('should lex @keywords', () => {
var cssCode = '@import()@something';
var tokens = tokenize(cssCode);
expect(tokens[0].type).toEqual(CssTokenType.AtKeyword);
expect(tokens[0].strValue).toEqual('@import');
expect(tokens[1].type).toEqual(CssTokenType.Character);
expect(tokens[1].strValue).toEqual('(');
expect(tokens[2].type).toEqual(CssTokenType.Character);
expect(tokens[2].strValue).toEqual(')');
expect(tokens[3].type).toEqual(CssTokenType.AtKeyword);
expect(tokens[3].strValue).toEqual('@something');
});
it('should still lex a number even if it has a dimension suffix', () => {
var cssCode = '40% is 40 percent';
var tokens = tokenize(cssCode);
expect(tokens[0].type).toEqual(CssTokenType.Number);
expect(tokens[0].strValue).toEqual('40');
expect(tokens[1].type).toEqual(CssTokenType.Character);
expect(tokens[1].strValue).toEqual('%');
expect(tokens[2].type).toEqual(CssTokenType.Identifier);
expect(tokens[2].strValue).toEqual('is');
expect(tokens[3].type).toEqual(CssTokenType.Number);
expect(tokens[3].strValue).toEqual('40');
});
it('should allow escaped character and unicode character-strings in CSS selectors', () => {
var cssCode = '\\123456 .some\\thing \{\}';
var tokens = tokenize(cssCode);
expect(tokens[0].type).toEqual(CssTokenType.Identifier);
expect(tokens[0].strValue).toEqual('\\123456');
expect(tokens[1].type).toEqual(CssTokenType.Character);
expect(tokens[2].type).toEqual(CssTokenType.Identifier);
expect(tokens[2].strValue).toEqual('some\\thing');
});
it('should distinguish identifiers and numbers from special characters', () => {
var cssCode = 'one*two=-4+three-4-equals_value$';
var tokens = tokenize(cssCode);
expect(tokens[0].type).toEqual(CssTokenType.Identifier);
expect(tokens[0].strValue).toEqual('one');
expect(tokens[1].type).toEqual(CssTokenType.Character);
expect(tokens[1].strValue).toEqual('*');
expect(tokens[2].type).toEqual(CssTokenType.Identifier);
expect(tokens[2].strValue).toEqual('two');
expect(tokens[3].type).toEqual(CssTokenType.Character);
expect(tokens[3].strValue).toEqual('=');
expect(tokens[4].type).toEqual(CssTokenType.Number);
expect(tokens[4].strValue).toEqual('-4');
expect(tokens[5].type).toEqual(CssTokenType.Character);
expect(tokens[5].strValue).toEqual('+');
expect(tokens[6].type).toEqual(CssTokenType.Identifier);
expect(tokens[6].strValue).toEqual('three-4-equals_value');
expect(tokens[7].type).toEqual(CssTokenType.Character);
expect(tokens[7].strValue).toEqual('$');
});
it('should filter out comments and whitespace by default', () => {
var cssCode = '.selector /* comment */ { /* value */ }';
var tokens = tokenize(cssCode);
expect(tokens[0].strValue).toEqual('.');
expect(tokens[1].strValue).toEqual('selector');
expect(tokens[2].strValue).toEqual('{');
expect(tokens[3].strValue).toEqual('}');
});
it('should track comments when the flag is set to true', () => {
var cssCode = '.selector /* comment */ { /* value */ }';
var trackComments = true;
var tokens = tokenize(cssCode, trackComments, CssLexerMode.ALL_TRACK_WS);
expect(tokens[0].strValue).toEqual('.');
expect(tokens[1].strValue).toEqual('selector');
expect(tokens[2].strValue).toEqual(' ');
expect(tokens[3].type).toEqual(CssTokenType.Comment);
expect(tokens[3].strValue).toEqual('/* comment */');
expect(tokens[4].strValue).toEqual(' ');
expect(tokens[5].strValue).toEqual('{');
expect(tokens[6].strValue).toEqual(' ');
expect(tokens[7].type).toEqual(CssTokenType.Comment);
expect(tokens[7].strValue).toEqual('/* value */');
});
describe('Selector Mode', () => {
it('should throw an error if a selector is being parsed while in the wrong mode', () => {
var cssCode = '.class > tag';
var capturedMessage: string;
try {
tokenize(cssCode, false, CssLexerMode.STYLE_BLOCK);
} catch (e) {
capturedMessage = e.rawMessage;
}
expect(capturedMessage).toMatch(/Unexpected character \[\>\] at column 0:7 in expression/g);
capturedMessage = null;
try {
tokenize(cssCode, false, CssLexerMode.SELECTOR);
} catch (e) {
capturedMessage = e.rawMessage;
}
expect(capturedMessage).toEqual(null);
});
});
describe('Attribute Mode', () => {
it('should consider attribute selectors as valid input and throw when an invalid modifier is used',
() => {
function tokenizeAttr(modifier: string) {
var cssCode = 'value' + modifier + '=\'something\'';
return tokenize(cssCode, false, CssLexerMode.ATTRIBUTE_SELECTOR);
}
expect(tokenizeAttr('*').length).toEqual(4);
expect(tokenizeAttr('|').length).toEqual(4);
expect(tokenizeAttr('^').length).toEqual(4);
expect(tokenizeAttr('$').length).toEqual(4);
expect(tokenizeAttr('~').length).toEqual(4);
expect(tokenizeAttr('').length).toEqual(3);
expect(() => { tokenizeAttr('+'); }).toThrow();
});
});
describe('Media Query Mode', () => {
it('should validate media queries with a reduced subset of valid characters', () => {
function tokenizeQuery(code: string) {
return tokenize(code, false, CssLexerMode.MEDIA_QUERY);
}
// the reason why the numbers are so high is because MediaQueries keep
// track of the whitespace values
expect(tokenizeQuery('(prop: value)').length).toEqual(5);
expect(tokenizeQuery('(prop: value) and (prop2: value2)').length).toEqual(11);
expect(tokenizeQuery('tv and (prop: value)').length).toEqual(7);
expect(tokenizeQuery('print and ((prop: value) or (prop2: value2))').length).toEqual(15);
expect(tokenizeQuery('(content: \'something $ crazy inside &\')').length).toEqual(5);
expect(() => { tokenizeQuery('(max-height: 10 + 20)'); }).toThrow();
expect(() => { tokenizeQuery('(max-height: fifty < 100)'); }).toThrow();
});
});
describe('Pseudo Selector Mode', () => {
it('should validate pseudo selector identifiers with a reduced subset of valid characters',
() => {
function tokenizePseudo(code: string, withArgs = false): CssToken[] {
var mode = withArgs ? CssLexerMode.PSEUDO_SELECTOR_WITH_ARGUMENTS :
CssLexerMode.PSEUDO_SELECTOR;
return tokenize(code, false, mode);
}
expect(tokenizePseudo('hover').length).toEqual(1);
expect(tokenizePseudo('focus').length).toEqual(1);
expect(tokenizePseudo('lang(en-us)', true).length).toEqual(4);
expect(() => { tokenizePseudo('lang(something:broken)', true); }).toThrow();
expect(() => { tokenizePseudo('not(.selector)', true); }).toThrow();
});
});
describe(
'Style Block Mode', () => {
it('should style blocks with a reduced subset of valid characters',
() => {
function tokenizeStyles(code: string) {
return tokenize(code, false, CssLexerMode.STYLE_BLOCK);
}
expect(tokenizeStyles(`
key: value;
prop: 100;
style: value3!important;
`).length).toEqual(14);
expect(() => tokenizeStyles(` key$: value; `)).toThrow();
expect(() => tokenizeStyles(` key: value$; `)).toThrow();
expect(() => tokenizeStyles(` key: value + 10; `)).toThrow();
expect(() => tokenizeStyles(` key: &value; `)).toThrow();
});
});
});
}
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