258 lines
11 KiB
C++
258 lines
11 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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**********************************************************************
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* Copyright (c) 2001-2011, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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* Date Name Description
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* 11/19/2001 aliu Creation.
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**********************************************************************
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*/
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#ifndef ICU_UTIL_H
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#define ICU_UTIL_H
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#include "unicode/utypes.h"
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#include "unicode/uobject.h"
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#include "unicode/unistr.h"
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//--------------------------------------------------------------------
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// class ICU_Utility
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// i18n utility functions, scoped into the class ICU_Utility.
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//--------------------------------------------------------------------
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U_NAMESPACE_BEGIN
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class UnicodeMatcher;
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class U_COMMON_API ICU_Utility /* not : public UObject because all methods are static */ {
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public:
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/**
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* Append a number to the given UnicodeString in the given radix.
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* Standard digits '0'-'9' are used and letters 'A'-'Z' for
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* radices 11 through 36.
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* @param result the digits of the number are appended here
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* @param n the number to be converted to digits; may be negative.
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* If negative, a '-' is prepended to the digits.
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* @param radix a radix from 2 to 36 inclusive.
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* @param minDigits the minimum number of digits, not including
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* any '-', to produce. Values less than 2 have no effect. One
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* digit is always emitted regardless of this parameter.
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* @return a reference to result
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*/
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static UnicodeString& appendNumber(UnicodeString& result, int32_t n,
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int32_t radix = 10,
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int32_t minDigits = 1);
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/** Returns a bogus UnicodeString by value. */
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static inline UnicodeString makeBogusString() {
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UnicodeString result;
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result.setToBogus();
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return result;
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}
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/**
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* Return true if the character is NOT printable ASCII.
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*
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* This method should really be in UnicodeString (or similar). For
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* now, we implement it here and share it with friend classes.
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*/
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static UBool isUnprintable(UChar32 c);
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/**
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* Escape unprintable characters using \uxxxx notation for U+0000 to
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* U+FFFF and \Uxxxxxxxx for U+10000 and above. If the character is
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* printable ASCII, then do nothing and return false. Otherwise,
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* append the escaped notation and return true.
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*/
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static UBool escapeUnprintable(UnicodeString& result, UChar32 c);
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/**
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* Returns the index of a character, ignoring quoted text.
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* For example, in the string "abc'hide'h", the 'h' in "hide" will not be
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* found by a search for 'h'.
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* @param text text to be searched
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* @param start the beginning index, inclusive; <code>0 <= start
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* <= limit</code>.
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* @param limit the ending index, exclusive; <code>start <= limit
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* <= text.length()</code>.
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* @param c character to search for
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* @return Offset of the first instance of c, or -1 if not found.
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*/
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//?FOR FUTURE USE. DISABLE FOR NOW for coverage reasons.
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// static int32_t quotedIndexOf(const UnicodeString& text,
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// int32_t start, int32_t limit,
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// UChar c);
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/**
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* Skip over a sequence of zero or more white space characters at pos.
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* @param advance if true, advance pos to the first non-white-space
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* character at or after pos, or str.length(), if there is none.
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* Otherwise leave pos unchanged.
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* @return the index of the first non-white-space character at or
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* after pos, or str.length(), if there is none.
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*/
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static int32_t skipWhitespace(const UnicodeString& str, int32_t& pos,
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UBool advance = false);
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/**
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* Skip over Pattern_White_Space in a Replaceable.
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* Skipping may be done in the forward or
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* reverse direction. In either case, the leftmost index will be
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* inclusive, and the rightmost index will be exclusive. That is,
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* given a range defined as [start, limit), the call
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* skipWhitespace(text, start, limit) will advance start past leading
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* whitespace, whereas the call skipWhitespace(text, limit, start),
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* will back up limit past trailing whitespace.
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* @param text the text to be analyzed
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* @param pos either the start or limit of a range of 'text', to skip
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* leading or trailing whitespace, respectively
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* @param stop either the limit or start of a range of 'text', to skip
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* leading or trailing whitespace, respectively
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* @return the new start or limit, depending on what was passed in to
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* 'pos'
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*/
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//?FOR FUTURE USE. DISABLE FOR NOW for coverage reasons.
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//? static int32_t skipWhitespace(const Replaceable& text,
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//? int32_t pos, int32_t stop);
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/**
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* Parse a single non-whitespace character 'ch', optionally
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* preceded by whitespace.
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* @param id the string to be parsed
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* @param pos INPUT-OUTPUT parameter. On input, pos[0] is the
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* offset of the first character to be parsed. On output, pos[0]
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* is the index after the last parsed character. If the parse
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* fails, pos[0] will be unchanged.
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* @param ch the non-whitespace character to be parsed.
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* @return true if 'ch' is seen preceded by zero or more
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* whitespace characters.
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*/
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static UBool parseChar(const UnicodeString& id, int32_t& pos, UChar ch);
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/**
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* Parse a pattern string starting at offset pos. Keywords are
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* matched case-insensitively. Spaces may be skipped and may be
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* optional or required. Integer values may be parsed, and if
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* they are, they will be returned in the given array. If
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* successful, the offset of the next non-space character is
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* returned. On failure, -1 is returned.
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* @param pattern must only contain lowercase characters, which
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* will match their uppercase equivalents as well. A space
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* character matches one or more required spaces. A '~' character
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* matches zero or more optional spaces. A '#' character matches
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* an integer and stores it in parsedInts, which the caller must
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* ensure has enough capacity.
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* @param parsedInts array to receive parsed integers. Caller
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* must ensure that parsedInts.length is >= the number of '#'
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* signs in 'pattern'.
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* @return the position after the last character parsed, or -1 if
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* the parse failed
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*/
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static int32_t parsePattern(const UnicodeString& rule, int32_t pos, int32_t limit,
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const UnicodeString& pattern, int32_t* parsedInts);
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/**
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* Parse a pattern string within the given Replaceable and a parsing
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* pattern. Characters are matched literally and case-sensitively
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* except for the following special characters:
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*
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* ~ zero or more Pattern_White_Space chars
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*
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* If end of pattern is reached with all matches along the way,
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* pos is advanced to the first unparsed index and returned.
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* Otherwise -1 is returned.
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* @param pat pattern that controls parsing
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* @param text text to be parsed, starting at index
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* @param index offset to first character to parse
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* @param limit offset after last character to parse
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* @return index after last parsed character, or -1 on parse failure.
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*/
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static int32_t parsePattern(const UnicodeString& pat,
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const Replaceable& text,
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int32_t index,
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int32_t limit);
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/**
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* Parse an integer at pos, either of the form \d+ or of the form
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* 0x[0-9A-Fa-f]+ or 0[0-7]+, that is, in standard decimal, hex,
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* or octal format.
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* @param pos INPUT-OUTPUT parameter. On input, the index of the first
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* character to parse. On output, the index of the character after the
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* last parsed character.
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*/
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static int32_t parseInteger(const UnicodeString& rule, int32_t& pos, int32_t limit);
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/**
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* Parse an integer at pos using only ASCII digits.
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* Base 10 only.
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* @param pos INPUT-OUTPUT parameter. On input, the index of the first
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* character to parse. On output, the index of the character after the
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* last parsed character.
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*/
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static int32_t parseAsciiInteger(const UnicodeString& str, int32_t& pos);
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/**
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* Parse a Unicode identifier from the given string at the given
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* position. Return the identifier, or an empty string if there
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* is no identifier.
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* @param str the string to parse
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* @param pos INPUT-OUPUT parameter. On INPUT, pos is the
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* first character to examine. It must be less than str.length(),
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* and it must not point to a whitespace character. That is, must
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* have pos < str.length() and
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* !UCharacter::isWhitespace(str.char32At(pos)). On
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* OUTPUT, the position after the last parsed character.
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* @return the Unicode identifier, or an empty string if there is
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* no valid identifier at pos.
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*/
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static UnicodeString parseUnicodeIdentifier(const UnicodeString& str, int32_t& pos);
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/**
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* Parse an unsigned 31-bit integer at the given offset. Use
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* UCharacter.digit() to parse individual characters into digits.
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* @param text the text to be parsed
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* @param pos INPUT-OUTPUT parameter. On entry, pos is the
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* offset within text at which to start parsing; it should point
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* to a valid digit. On exit, pos is the offset after the last
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* parsed character. If the parse failed, it will be unchanged on
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* exit. Must be >= 0 on entry.
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* @param radix the radix in which to parse; must be >= 2 and <=
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* 36.
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* @return a non-negative parsed number, or -1 upon parse failure.
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* Parse fails if there are no digits, that is, if pos does not
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* point to a valid digit on entry, or if the number to be parsed
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* does not fit into a 31-bit unsigned integer.
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*/
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static int32_t parseNumber(const UnicodeString& text,
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int32_t& pos, int8_t radix);
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static void appendToRule(UnicodeString& rule,
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UChar32 c,
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UBool isLiteral,
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UBool escapeUnprintable,
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UnicodeString& quoteBuf);
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static void appendToRule(UnicodeString& rule,
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const UnicodeString& text,
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UBool isLiteral,
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UBool escapeUnprintable,
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UnicodeString& quoteBuf);
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static void appendToRule(UnicodeString& rule,
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const UnicodeMatcher* matcher,
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UBool escapeUnprintable,
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UnicodeString& quoteBuf);
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private:
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// do not instantiate
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ICU_Utility();
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};
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U_NAMESPACE_END
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#endif
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//eof
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