| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package gls.ch03.s03 |
| |
| import groovy.test.GroovyTestCase |
| |
| /** |
| * GLS 3.3: |
| * Implementations first recognize Unicode escapes in their input, translating |
| * the ASCII characters backslash and 'u' followed by four hexadecimal digits |
| * to the Unicode character with the indicated hexadecimal value, and passing |
| * all other characters unchanged. |
| */ |
| class UnicodeEscapes1 extends GroovyTestCase { |
| |
| void testAllHexDigits() { |
| // All hex digits work (char def0 is a special codepoint) |
| def s = "\u1234\u5678\u9abc\u0fed\u9ABC\u0FEC" |
| assert s.charAt(0) == 0x1234 |
| assert s.charAt(1) == 0x5678 |
| assert s.charAt(2) == 0x9abc |
| assert s.charAt(3) == 0x0fed |
| assert s.charAt(4) == 0x9abc |
| assert s.charAt(5) == 0x0fec |
| } |
| |
| // There can be 1 or more u's after the backslash |
| /* |
| void testMultipleUs() { |
| assert "\uu0061" == "a" |
| assert "\uuu0061" == "a" |
| assert "\uuuuu0061" == "a" |
| } |
| */ |
| |
| void testOtherVariations() { |
| // Capital 'U' not allowed |
| // assert "\U0061" == "a" // @fail:parse |
| } |
| |
| // todo: Implementations should use the \ uxxxx notation as an output format to |
| // display Unicode characters when a suitable font is not available. |
| // (to be tested as part of the standard library) |
| |
| // todo: Representing supplementary characters requires two consecutive Unicode |
| // escapes. |
| // (not sure how to test) |
| // see: gls.ch03.s01.Unicode2.testUTF16SupplementaryCharacters() |
| |
| // todo: test unicode escapes last in file |
| // and invalid escapes at end of file |
| } |