patternprops.h (3356B)
1 // © 2016 and later: Unicode, Inc. and others. 2 // License & terms of use: http://www.unicode.org/copyright.html 3 /* 4 ******************************************************************************* 5 * Copyright (C) 2011, International Business Machines 6 * Corporation and others. All Rights Reserved. 7 ******************************************************************************* 8 * file name: patternprops.h 9 * encoding: UTF-8 10 * tab size: 8 (not used) 11 * indentation:4 12 * 13 * created on: 2011mar13 14 * created by: Markus W. Scherer 15 */ 16 17 #ifndef __PATTERNPROPS_H__ 18 #define __PATTERNPROPS_H__ 19 20 #include "unicode/unistr.h" 21 #include "unicode/utypes.h" 22 23 U_NAMESPACE_BEGIN 24 25 /** 26 * Implements the immutable Unicode properties Pattern_Syntax and Pattern_White_Space. 27 * Hardcodes these properties, does not load data, does not depend on other ICU classes. 28 * <p> 29 * Note: Both properties include ASCII as well as non-ASCII, non-Latin-1 code points, 30 * and both properties only include BMP code points (no supplementary ones). 31 * Pattern_Syntax includes some unassigned code points. 32 * <p> 33 * [:Pattern_White_Space:] = 34 * [\u0009-\u000D\ \u0085\u200E\u200F\u2028\u2029] 35 * <p> 36 * [:Pattern_Syntax:] = 37 * [!-/\:-@\[-\^`\{-~\u00A1-\u00A7\u00A9\u00AB\u00AC\u00AE 38 * \u00B0\u00B1\u00B6\u00BB\u00BF\u00D7\u00F7 39 * \u2010-\u2027\u2030-\u203E\u2041-\u2053\u2055-\u205E 40 * \u2190-\u245F\u2500-\u2775\u2794-\u2BFF\u2E00-\u2E7F 41 * \u3001-\u3003\u3008-\u3020\u3030\uFD3E\uFD3F\uFE45\uFE46] 42 * @author mscherer 43 */ 44 class U_COMMON_API PatternProps { 45 public: 46 /** 47 * @return true if c is a Pattern_Syntax code point. 48 */ 49 static UBool isSyntax(UChar32 c); 50 51 /** 52 * @return true if c is a Pattern_Syntax or Pattern_White_Space code point. 53 */ 54 static UBool isSyntaxOrWhiteSpace(UChar32 c); 55 56 /** 57 * @return true if c is a Pattern_White_Space character. 58 */ 59 static UBool isWhiteSpace(UChar32 c); 60 61 /** 62 * Skips over Pattern_White_Space starting at s. 63 * @return The smallest pointer at or after s with a non-white space character. 64 */ 65 static const char16_t *skipWhiteSpace(const char16_t *s, int32_t length); 66 67 /** 68 * Skips over Pattern_White_Space starting at index start in s. 69 * @return The smallest index at or after start with a non-white space character. 70 */ 71 static int32_t skipWhiteSpace(const UnicodeString &s, int32_t start); 72 73 /** 74 * @return s except with leading and trailing Pattern_White_Space removed and length adjusted. 75 */ 76 static const char16_t *trimWhiteSpace(const char16_t *s, int32_t &length); 77 78 /** 79 * Tests whether the string contains a "pattern identifier", that is, 80 * whether it contains only non-Pattern_White_Space, non-Pattern_Syntax characters. 81 * @return true if there are no Pattern_White_Space or Pattern_Syntax characters in s. 82 */ 83 static UBool isIdentifier(const char16_t *s, int32_t length); 84 85 /** 86 * Skips over a "pattern identifier" starting at index s. 87 * @return The smallest pointer at or after s with 88 * a Pattern_White_Space or Pattern_Syntax character. 89 */ 90 static const char16_t *skipIdentifier(const char16_t *s, int32_t length); 91 92 private: 93 PatternProps() = delete; // no constructor: all static methods 94 }; 95 96 U_NAMESPACE_END 97 98 #endif // __PATTERNPROPS_H__