| // © 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. |
| ********************************************************************** |
| */ |
| |
| #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 |
| } |
| |
| int32_t ICU_Utility::parseAsciiInteger(const UnicodeString& str, int32_t& pos) { |
| int32_t result = 0; |
| UChar c; |
| while (pos < str.length() && (c = str.charAt(pos)) >= u'0' && c <= u'9') { |
| result = result * 10 + (c - u'0'); |
| pos++; |
| } |
| return result; |
| } |
| |
| /** |
| * 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 |
