// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* ********************************************************************** * Copyright (c) 2001-2011, International Business Machines * Corporation and others. All Rights Reserved. ********************************************************************** * Date Name Description * 11/19/2001 aliu Creation. ********************************************************************** */ #ifndef ICU_UTIL_H #define ICU_UTIL_H #include "charstr.h" #include "unicode/unistr.h" #include "unicode/uobject.h" #include "unicode/utypes.h" //-------------------------------------------------------------------- // class ICU_Utility // i18n utility functions, scoped into the class ICU_Utility. //-------------------------------------------------------------------- U_NAMESPACE_BEGIN class UnicodeMatcher; class U_COMMON_API ICU_Utility /* not : public UObject because all methods are static */ { public: /** * Append a number to the given UnicodeString in the given radix. * Standard digits '0'-'9' are used and letters 'A'-'Z' for * radices 11 through 36. * @param result the digits of the number are appended here * @param n the number to be converted to digits; may be negative. * If negative, a '-' is prepended to the digits. * @param radix a radix from 2 to 36 inclusive. * @param minDigits the minimum number of digits, not including * any '-', to produce. Values less than 2 have no effect. One * digit is always emitted regardless of this parameter. * @return a reference to result */ static UnicodeString& appendNumber(UnicodeString& result, int32_t n, int32_t radix = 10, int32_t minDigits = 1); /** Returns a bogus UnicodeString by value. */ static inline UnicodeString makeBogusString() { UnicodeString result; result.setToBogus(); return result; } /** * Return true if the character is NOT printable ASCII. * The tab, newline and linefeed characters are considered unprintable. */ static UBool isUnprintable(UChar32 c); /** * @return true for control codes and for surrogate and noncharacter code points */ static UBool shouldAlwaysBeEscaped(UChar32 c); /** * Escapes one unprintable code point using \uxxxx notation for U+0000 to * U+FFFF and \Uxxxxxxxx for U+10000 and above. If the character is * printable ASCII, then do nothing and return false. Otherwise, * append the escaped notation and return true. */ static UBool escapeUnprintable(UnicodeString& result, UChar32 c); /** * Escapes one code point using \uxxxx notation * for U+0000 to U+FFFF and \Uxxxxxxxx for U+10000 and above. * @return result */ static UnicodeString &escape(UnicodeString& result, UChar32 c); /** * Returns the index of a character, ignoring quoted text. * For example, in the string "abc'hide'h", the 'h' in "hide" will not be * found by a search for 'h'. * @param text text to be searched * @param start the beginning index, inclusive;

0 <= start
     * <= limit

. * @param limit the ending index, exclusive;

start <= limit
     * <= text.length()

. * @param c character to search for * @return Offset of the first instance of c, or -1 if not found. */ //?FOR FUTURE USE. DISABLE FOR NOW for coverage reasons. // static int32_t quotedIndexOf(const UnicodeString& text, // int32_t start, int32_t limit, // char16_t c); /** * Skip over a sequence of zero or more white space characters at pos. * @param advance if true, advance pos to the first non-white-space * character at or after pos, or str.length(), if there is none. * Otherwise leave pos unchanged. * @return the index of the first non-white-space character at or * after pos, or str.length(), if there is none. */ static int32_t skipWhitespace(const UnicodeString& str, int32_t& pos, UBool advance = false); /** * Skip over Pattern_White_Space in a Replaceable. * Skipping may be done in the forward or * reverse direction. In either case, the leftmost index will be * inclusive, and the rightmost index will be exclusive. That is, * given a range defined as [start, limit), the call * skipWhitespace(text, start, limit) will advance start past leading * whitespace, whereas the call skipWhitespace(text, limit, start), * will back up limit past trailing whitespace. * @param text the text to be analyzed * @param pos either the start or limit of a range of 'text', to skip * leading or trailing whitespace, respectively * @param stop either the limit or start of a range of 'text', to skip * leading or trailing whitespace, respectively * @return the new start or limit, depending on what was passed in to * 'pos' */ //?FOR FUTURE USE. DISABLE FOR NOW for coverage reasons. //? static int32_t skipWhitespace(const Replaceable& text, //? int32_t pos, int32_t stop); /** * Parse a single non-whitespace character 'ch', optionally * preceded by whitespace. * @param id the string to be parsed * @param pos INPUT-OUTPUT parameter. On input, pos[0] is the * offset of the first character to be parsed. On output, pos[0] * is the index after the last parsed character. If the parse * fails, pos[0] will be unchanged. * @param ch the non-whitespace character to be parsed. * @return true if 'ch' is seen preceded by zero or more * whitespace characters. */ static UBool parseChar(const UnicodeString& id, int32_t& pos, char16_t ch); /** * Parse a pattern string starting at offset pos. Keywords are * matched case-insensitively. Spaces may be skipped and may be * optional or required. Integer values may be parsed, and if * they are, they will be returned in the given array. If * successful, the offset of the next non-space character is * returned. On failure, -1 is returned. * @param pattern must only contain lowercase characters, which * will match their uppercase equivalents as well. A space * character matches one or more required spaces. A '~' character * matches zero or more optional spaces. A '#' character matches * an integer and stores it in parsedInts, which the caller must * ensure has enough capacity. * @param parsedInts array to receive parsed integers. Caller * must ensure that parsedInts.length is >= the number of '#' * signs in 'pattern'. * @return the position after the last character parsed, or -1 if * the parse failed */ static int32_t parsePattern(const UnicodeString& rule, int32_t pos, int32_t limit, const UnicodeString& pattern, int32_t* parsedInts); /** * Parse a pattern string within the given Replaceable and a parsing * pattern. Characters are matched literally and case-sensitively * except for the following special characters: * * ~ zero or more Pattern_White_Space chars * * If end of pattern is reached with all matches along the way, * pos is advanced to the first unparsed index and returned. * Otherwise -1 is returned. * @param pat pattern that controls parsing * @param text text to be parsed, starting at index * @param index offset to first character to parse * @param limit offset after last character to parse * @return index after last parsed character, or -1 on parse failure. */ static int32_t parsePattern(const UnicodeString& pat, const Replaceable& text, int32_t index, int32_t limit); /** * Parse an integer at pos, either of the form \d+ or of the form * 0x[0-9A-Fa-f]+ or 0[0-7]+, that is, in standard decimal, hex, * or octal format. * @param pos INPUT-OUTPUT parameter. On input, the index of the first * character to parse. On output, the index of the character after the * last parsed character. */ static int32_t parseInteger(const UnicodeString& rule, int32_t& pos, int32_t limit); /** * Parse an integer at pos using only ASCII digits. * Base 10 only. * @param pos INPUT-OUTPUT parameter. On input, the index of the first * character to parse. On output, the index of the character after the * last parsed character. */ static int32_t parseAsciiInteger(const UnicodeString& str, int32_t& pos); /** * Parse a Unicode identifier from the given string at the given * position. Return the identifier, or an empty string if there * is no identifier. * @param str the string to parse * @param pos INPUT-OUTPUT parameter. On INPUT, pos is the * first character to examine. It must be less than str.length(), * and it must not point to a whitespace character. That is, must * have pos < str.length() and * !UCharacter::isWhitespace(str.char32At(pos)). On * OUTPUT, the position after the last parsed character. * @return the Unicode identifier, or an empty string if there is * no valid identifier at pos. */ static UnicodeString parseUnicodeIdentifier(const UnicodeString& str, int32_t& pos); /** * Parse an unsigned 31-bit integer at the given offset. Use * UCharacter.digit() to parse individual characters into digits. * @param text the text to be parsed * @param pos INPUT-OUTPUT parameter. On entry, pos is the * offset within text at which to start parsing; it should point * to a valid digit. On exit, pos is the offset after the last * parsed character. If the parse failed, it will be unchanged on * exit. Must be >= 0 on entry. * @param radix the radix in which to parse; must be >= 2 and <= * 36. * @return a non-negative parsed number, or -1 upon parse failure. * Parse fails if there are no digits, that is, if pos does not * point to a valid digit on entry, or if the number to be parsed * does not fit into a 31-bit unsigned integer. */ static int32_t parseNumber(const UnicodeString& text, int32_t& pos, int8_t radix); static void appendToRule(UnicodeString& rule, UChar32 c, UBool isLiteral, UBool escapeUnprintable, UnicodeString& quoteBuf); static void appendToRule(UnicodeString& rule, const UnicodeString& text, UBool isLiteral, UBool escapeUnprintable, UnicodeString& quoteBuf); static void appendToRule(UnicodeString& rule, const UnicodeMatcher* matcher, UBool escapeUnprintable, UnicodeString& quoteBuf); private: // do not instantiate ICU_Utility() = delete; }; U_NAMESPACE_END #endif //eof