/* ********************************************************************** * Copyright (c) 2001-2011, International Business Machines * Corporation and others. All Rights Reserved. ********************************************************************** * Date Name Description * 11/19/2001 aliu Creation. ********************************************************************** */ #include "unicode/unimatch.h" #include "unicode/utf16.h" #include "patternprops.h" #include "util.h" // Define UChar constants using hex for EBCDIC compatibility static const UChar BACKSLASH = 0x005C; /*\*/ static const UChar UPPER_U = 0x0055; /*U*/ static const UChar LOWER_U = 0x0075; /*u*/ static const UChar APOSTROPHE = 0x0027; // '\'' static const UChar SPACE = 0x0020; // ' ' // "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" static const UChar DIGITS[] = { 48,49,50,51,52,53,54,55,56,57, 65,66,67,68,69,70,71,72,73,74, 75,76,77,78,79,80,81,82,83,84, 85,86,87,88,89,90 }; U_NAMESPACE_BEGIN UnicodeString& ICU_Utility::appendNumber(UnicodeString& result, int32_t n, int32_t radix, int32_t minDigits) { if (radix < 2 || radix > 36) { // Bogus radix return result.append((UChar)63/*?*/); } // Handle negatives if (n < 0) { n = -n; result.append((UChar)45/*-*/); } // First determine the number of digits int32_t nn = n; int32_t r = 1; while (nn >= radix) { nn /= radix; r *= radix; --minDigits; } // Now generate the digits while (--minDigits > 0) { result.append(DIGITS[0]); } while (r > 0) { int32_t digit = n / r; result.append(DIGITS[digit]); n -= digit * r; r /= radix; } return result; } /** * Return true if the character is NOT printable ASCII. */ UBool ICU_Utility::isUnprintable(UChar32 c) { return !(c >= 0x20 && c <= 0x7E); } /** * Escape unprintable characters 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. */ UBool ICU_Utility::escapeUnprintable(UnicodeString& result, UChar32 c) { if (isUnprintable(c)) { result.append(BACKSLASH); if (c & ~0xFFFF) { result.append(UPPER_U); result.append(DIGITS[0xF&(c>>28)]); result.append(DIGITS[0xF&(c>>24)]); result.append(DIGITS[0xF&(c>>20)]); result.append(DIGITS[0xF&(c>>16)]); } else { result.append(LOWER_U); } result.append(DIGITS[0xF&(c>>12)]); result.append(DIGITS[0xF&(c>>8)]); result.append(DIGITS[0xF&(c>>4)]); result.append(DIGITS[0xF&c]); return TRUE; } return FALSE; } /** * 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'. */ // FOR FUTURE USE. DISABLE FOR NOW for coverage reasons. /* int32_t ICU_Utility::quotedIndexOf(const UnicodeString& text, int32_t start, int32_t limit, UChar charToFind) { for (int32_t i=start; i<limit; ++i) { UChar c = text.charAt(i); if (c == BACKSLASH) { ++i; } else if (c == APOSTROPHE) { while (++i < limit && text.charAt(i) != APOSTROPHE) {} } else if (c == charToFind) { return i; } } return -1; } */ /** * 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. */ int32_t ICU_Utility::skipWhitespace(const UnicodeString& str, int32_t& pos, UBool advance) { int32_t p = pos; const UChar* s = str.getBuffer(); p = (int32_t)(PatternProps::skipWhiteSpace(s + p, str.length() - p) - s); if (advance) { pos = p; } return p; } /** * 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. //?int32_t ICU_Utility::skipWhitespace(const Replaceable& text, //? int32_t pos, int32_t stop) { //? UChar32 c; //? UBool isForward = (stop >= pos); //? //? if (!isForward) { //? --pos; // pos is a limit, so back up by one //? } //? //? while (pos != stop && //? PatternProps::isWhiteSpace(c = text.char32At(pos))) { //? if (isForward) { //? pos += U16_LENGTH(c); //? } else { //? pos -= U16_LENGTH(c); //? } //? } //? //? if (!isForward) { //? ++pos; // make pos back into a limit //? } //? //? return pos; //?} /** * 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. */ UBool ICU_Utility::parseChar(const UnicodeString& id, int32_t& pos, UChar ch) { int32_t start = pos; skipWhitespace(id, pos, TRUE); if (pos == id.length() || id.charAt(pos) != ch) { pos = start; return FALSE; } ++pos; return TRUE; } /** * 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. */ int32_t ICU_Utility::parsePattern(const UnicodeString& pat, const Replaceable& text, int32_t index, int32_t limit) { int32_t ipat = 0; // empty pattern matches immediately if (ipat == pat.length()) { return index; } UChar32 cpat = pat.char32At(ipat); while (index < limit) { UChar32 c = text.char32At(index); // parse \s* if (cpat == 126 /*~*/) { if (PatternProps::isWhiteSpace(c)) { index += U16_LENGTH(c); continue; } else { if (++ipat == pat.length()) { return index; // success; c unparsed } // fall thru; process c again with next cpat } } // parse literal else if (c == cpat) { index += U16_LENGTH(c); ipat += U16_LENGTH(cpat); if (ipat == pat.length()) { return index; // success; c parsed } // fall thru; get next cpat } // match failure of literal else { return -1; } cpat = pat.char32At(ipat); } return -1; // text ended before end of pat } /** * Append a character to a rule that is being built up. To flush * the quoteBuf to rule, make one final call with isLiteral == TRUE. * If there is no final character, pass in (UChar32)-1 as c. * @param rule the string to append the character to * @param c the character to append, or (UChar32)-1 if none. * @param isLiteral if true, then the given character should not be * quoted or escaped. Usually this means it is a syntactic element * such as > or $ * @param escapeUnprintable if true, then unprintable characters * should be escaped using \uxxxx or \Uxxxxxxxx. These escapes will * appear outside of quotes. * @param quoteBuf a buffer which is used to build up quoted * substrings. The caller should initially supply an empty buffer, * and thereafter should not modify the buffer. The buffer should be * cleared out by, at the end, calling this method with a literal * character. */ void ICU_Utility::appendToRule(UnicodeString& rule, UChar32 c, UBool isLiteral, UBool escapeUnprintable, UnicodeString& quoteBuf) { // If we are escaping unprintables, then escape them outside // quotes. \u and \U are not recognized within quotes. The same // logic applies to literals, but literals are never escaped. if (isLiteral || (escapeUnprintable && ICU_Utility::isUnprintable(c))) { if (quoteBuf.length() > 0) { // We prefer backslash APOSTROPHE to double APOSTROPHE // (more readable, less similar to ") so if there are // double APOSTROPHEs at the ends, we pull them outside // of the quote. // If the first thing in the quoteBuf is APOSTROPHE // (doubled) then pull it out. while (quoteBuf.length() >= 2 && quoteBuf.charAt(0) == APOSTROPHE && quoteBuf.charAt(1) == APOSTROPHE) { rule.append(BACKSLASH).append(APOSTROPHE); quoteBuf.remove(0, 2); } // If the last thing in the quoteBuf is APOSTROPHE // (doubled) then remove and count it and add it after. int32_t trailingCount = 0; while (quoteBuf.length() >= 2 && quoteBuf.charAt(quoteBuf.length()-2) == APOSTROPHE && quoteBuf.charAt(quoteBuf.length()-1) == APOSTROPHE) { quoteBuf.truncate(quoteBuf.length()-2); ++trailingCount; } if (quoteBuf.length() > 0) { rule.append(APOSTROPHE); rule.append(quoteBuf); rule.append(APOSTROPHE); quoteBuf.truncate(0); } while (trailingCount-- > 0) { rule.append(BACKSLASH).append(APOSTROPHE); } } if (c != (UChar32)-1) { /* Since spaces are ignored during parsing, they are * emitted only for readability. We emit one here * only if there isn't already one at the end of the * rule. */ if (c == SPACE) { int32_t len = rule.length(); if (len > 0 && rule.charAt(len-1) != c) { rule.append(c); } } else if (!escapeUnprintable || !ICU_Utility::escapeUnprintable(rule, c)) { rule.append(c); } } } // Escape ' and '\' and don't begin a quote just for them else if (quoteBuf.length() == 0 && (c == APOSTROPHE || c == BACKSLASH)) { rule.append(BACKSLASH); rule.append(c); } // Specials (printable ascii that isn't [0-9a-zA-Z]) and // whitespace need quoting. Also append stuff to quotes if we are // building up a quoted substring already. else if (quoteBuf.length() > 0 || (c >= 0x0021 && c <= 0x007E && !((c >= 0x0030/*'0'*/ && c <= 0x0039/*'9'*/) || (c >= 0x0041/*'A'*/ && c <= 0x005A/*'Z'*/) || (c >= 0x0061/*'a'*/ && c <= 0x007A/*'z'*/))) || PatternProps::isWhiteSpace(c)) { quoteBuf.append(c); // Double ' within a quote if (c == APOSTROPHE) { quoteBuf.append(c); } } // Otherwise just append else { rule.append(c); } } void ICU_Utility::appendToRule(UnicodeString& rule, const UnicodeString& text, UBool isLiteral, UBool escapeUnprintable, UnicodeString& quoteBuf) { for (int32_t i=0; i<text.length(); ++i) { appendToRule(rule, text[i], isLiteral, escapeUnprintable, quoteBuf); } } /** * Given a matcher reference, which may be null, append its * pattern as a literal to the given rule. */ void ICU_Utility::appendToRule(UnicodeString& rule, const UnicodeMatcher* matcher, UBool escapeUnprintable, UnicodeString& quoteBuf) { if (matcher != NULL) { UnicodeString pat; appendToRule(rule, matcher->toPattern(pat, escapeUnprintable), TRUE, escapeUnprintable, quoteBuf); } } U_NAMESPACE_END