436 lines
14 KiB
C++
436 lines
14 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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#include "unicode/unimatch.h"
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#include "unicode/utf16.h"
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#include "patternprops.h"
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#include "util.h"
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// Define UChar constants using hex for EBCDIC compatibility
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static const UChar BACKSLASH = 0x005C; /*\*/
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static const UChar UPPER_U = 0x0055; /*U*/
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static const UChar LOWER_U = 0x0075; /*u*/
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static const UChar APOSTROPHE = 0x0027; // '\''
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static const UChar SPACE = 0x0020; // ' '
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// "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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static const UChar DIGITS[] = {
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48,49,50,51,52,53,54,55,56,57,
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65,66,67,68,69,70,71,72,73,74,
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75,76,77,78,79,80,81,82,83,84,
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85,86,87,88,89,90
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};
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U_NAMESPACE_BEGIN
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UnicodeString& ICU_Utility::appendNumber(UnicodeString& result, int32_t n,
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int32_t radix, int32_t minDigits) {
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if (radix < 2 || radix > 36) {
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// Bogus radix
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return result.append((UChar)63/*?*/);
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}
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// Handle negatives
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if (n < 0) {
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n = -n;
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result.append((UChar)45/*-*/);
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}
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// First determine the number of digits
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int32_t nn = n;
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int32_t r = 1;
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while (nn >= radix) {
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nn /= radix;
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r *= radix;
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--minDigits;
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}
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// Now generate the digits
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while (--minDigits > 0) {
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result.append(DIGITS[0]);
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}
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while (r > 0) {
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int32_t digit = n / r;
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result.append(DIGITS[digit]);
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n -= digit * r;
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r /= radix;
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}
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return result;
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}
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UBool ICU_Utility::isUnprintable(UChar32 c) {
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return !(c >= 0x20 && c <= 0x7E);
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}
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UBool ICU_Utility::shouldAlwaysBeEscaped(UChar32 c) {
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if (c < 0x20) {
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return true; // C0 control codes
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} else if (c <= 0x7e) {
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return false; // printable ASCII
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} else if (c <= 0x9f) {
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return true; // C1 control codes
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} else if (c < 0xd800) {
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return false; // most of the BMP
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} else if (c <= 0xdfff || (0xfdd0 <= c && c <= 0xfdef) || (c & 0xfffe) == 0xfffe) {
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return true; // surrogate or noncharacter code points
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} else if (c <= 0x10ffff) {
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return false; // all else
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} else {
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return true; // not a code point
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}
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}
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UBool ICU_Utility::escapeUnprintable(UnicodeString& result, UChar32 c) {
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if (isUnprintable(c)) {
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escape(result, c);
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return true;
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}
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return false;
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}
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UnicodeString &ICU_Utility::escape(UnicodeString& result, UChar32 c) {
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result.append(BACKSLASH);
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if (c & ~0xFFFF) {
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result.append(UPPER_U);
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result.append(DIGITS[0xF&(c>>28)]);
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result.append(DIGITS[0xF&(c>>24)]);
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result.append(DIGITS[0xF&(c>>20)]);
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result.append(DIGITS[0xF&(c>>16)]);
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} else {
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result.append(LOWER_U);
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}
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result.append(DIGITS[0xF&(c>>12)]);
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result.append(DIGITS[0xF&(c>>8)]);
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result.append(DIGITS[0xF&(c>>4)]);
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result.append(DIGITS[0xF&c]);
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return result;
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}
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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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*/
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// FOR FUTURE USE. DISABLE FOR NOW for coverage reasons.
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/*
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int32_t ICU_Utility::quotedIndexOf(const UnicodeString& text,
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int32_t start, int32_t limit,
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UChar charToFind) {
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for (int32_t i=start; i<limit; ++i) {
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UChar c = text.charAt(i);
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if (c == BACKSLASH) {
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++i;
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} else if (c == APOSTROPHE) {
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while (++i < limit
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&& text.charAt(i) != APOSTROPHE) {}
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} else if (c == charToFind) {
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return i;
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}
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}
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return -1;
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}
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*/
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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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int32_t ICU_Utility::skipWhitespace(const UnicodeString& str, int32_t& pos,
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UBool advance) {
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int32_t p = pos;
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const UChar* s = str.getBuffer();
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p = (int32_t)(PatternProps::skipWhiteSpace(s + p, str.length() - p) - s);
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if (advance) {
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pos = p;
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}
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return p;
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}
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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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//?int32_t ICU_Utility::skipWhitespace(const Replaceable& text,
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//? int32_t pos, int32_t stop) {
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//? UChar32 c;
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//? UBool isForward = (stop >= pos);
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//?
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//? if (!isForward) {
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//? --pos; // pos is a limit, so back up by one
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//? }
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//?
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//? while (pos != stop &&
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//? PatternProps::isWhiteSpace(c = text.char32At(pos))) {
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//? if (isForward) {
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//? pos += U16_LENGTH(c);
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//? } else {
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//? pos -= U16_LENGTH(c);
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//? }
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//? }
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//?
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//? if (!isForward) {
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//? ++pos; // make pos back into a limit
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//? }
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//?
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//? return pos;
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//?}
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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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UBool ICU_Utility::parseChar(const UnicodeString& id, int32_t& pos, UChar ch) {
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int32_t start = pos;
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skipWhitespace(id, pos, true);
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if (pos == id.length() ||
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id.charAt(pos) != ch) {
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pos = start;
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return false;
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}
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++pos;
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return true;
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}
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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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int32_t ICU_Utility::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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int32_t ipat = 0;
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// empty pattern matches immediately
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if (ipat == pat.length()) {
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return index;
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}
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UChar32 cpat = pat.char32At(ipat);
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while (index < limit) {
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UChar32 c = text.char32At(index);
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// parse \s*
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if (cpat == 126 /*~*/) {
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if (PatternProps::isWhiteSpace(c)) {
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index += U16_LENGTH(c);
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continue;
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} else {
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if (++ipat == pat.length()) {
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return index; // success; c unparsed
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}
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// fall thru; process c again with next cpat
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}
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}
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// parse literal
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else if (c == cpat) {
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index += U16_LENGTH(c);
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ipat += U16_LENGTH(cpat);
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if (ipat == pat.length()) {
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return index; // success; c parsed
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}
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// fall thru; get next cpat
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}
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// match failure of literal
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else {
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return -1;
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}
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cpat = pat.char32At(ipat);
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}
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return -1; // text ended before end of pat
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}
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int32_t ICU_Utility::parseAsciiInteger(const UnicodeString& str, int32_t& pos) {
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int32_t result = 0;
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UChar c;
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while (pos < str.length() && (c = str.charAt(pos)) >= u'0' && c <= u'9') {
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result = result * 10 + (c - u'0');
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pos++;
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}
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return result;
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}
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/**
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* Append a character to a rule that is being built up. To flush
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* the quoteBuf to rule, make one final call with isLiteral == true.
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* If there is no final character, pass in (UChar32)-1 as c.
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* @param rule the string to append the character to
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* @param c the character to append, or (UChar32)-1 if none.
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* @param isLiteral if true, then the given character should not be
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* quoted or escaped. Usually this means it is a syntactic element
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* such as > or $
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* @param escapeUnprintable if true, then unprintable characters
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* should be escaped using \uxxxx or \Uxxxxxxxx. These escapes will
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* appear outside of quotes.
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* @param quoteBuf a buffer which is used to build up quoted
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* substrings. The caller should initially supply an empty buffer,
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* and thereafter should not modify the buffer. The buffer should be
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* cleared out by, at the end, calling this method with a literal
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* character.
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*/
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void ICU_Utility::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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// If we are escaping unprintables, then escape them outside
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// quotes. \u and \U are not recognized within quotes. The same
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// logic applies to literals, but literals are never escaped.
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if (isLiteral ||
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(escapeUnprintable && ICU_Utility::isUnprintable(c))) {
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if (quoteBuf.length() > 0) {
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// We prefer backslash APOSTROPHE to double APOSTROPHE
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// (more readable, less similar to ") so if there are
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// double APOSTROPHEs at the ends, we pull them outside
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// of the quote.
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// If the first thing in the quoteBuf is APOSTROPHE
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// (doubled) then pull it out.
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while (quoteBuf.length() >= 2 &&
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quoteBuf.charAt(0) == APOSTROPHE &&
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quoteBuf.charAt(1) == APOSTROPHE) {
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rule.append(BACKSLASH).append(APOSTROPHE);
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quoteBuf.remove(0, 2);
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}
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// If the last thing in the quoteBuf is APOSTROPHE
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// (doubled) then remove and count it and add it after.
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int32_t trailingCount = 0;
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while (quoteBuf.length() >= 2 &&
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quoteBuf.charAt(quoteBuf.length()-2) == APOSTROPHE &&
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quoteBuf.charAt(quoteBuf.length()-1) == APOSTROPHE) {
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quoteBuf.truncate(quoteBuf.length()-2);
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++trailingCount;
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}
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if (quoteBuf.length() > 0) {
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rule.append(APOSTROPHE);
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rule.append(quoteBuf);
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rule.append(APOSTROPHE);
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quoteBuf.truncate(0);
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}
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while (trailingCount-- > 0) {
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rule.append(BACKSLASH).append(APOSTROPHE);
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}
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}
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if (c != (UChar32)-1) {
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/* Since spaces are ignored during parsing, they are
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* emitted only for readability. We emit one here
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* only if there isn't already one at the end of the
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* rule.
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*/
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if (c == SPACE) {
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int32_t len = rule.length();
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if (len > 0 && rule.charAt(len-1) != c) {
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rule.append(c);
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}
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} else if (!escapeUnprintable || !ICU_Utility::escapeUnprintable(rule, c)) {
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rule.append(c);
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}
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}
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}
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// Escape ' and '\' and don't begin a quote just for them
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else if (quoteBuf.length() == 0 &&
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(c == APOSTROPHE || c == BACKSLASH)) {
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rule.append(BACKSLASH);
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rule.append(c);
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}
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// Specials (printable ascii that isn't [0-9a-zA-Z]) and
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// whitespace need quoting. Also append stuff to quotes if we are
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// building up a quoted substring already.
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else if (quoteBuf.length() > 0 ||
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(c >= 0x0021 && c <= 0x007E &&
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!((c >= 0x0030/*'0'*/ && c <= 0x0039/*'9'*/) ||
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(c >= 0x0041/*'A'*/ && c <= 0x005A/*'Z'*/) ||
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(c >= 0x0061/*'a'*/ && c <= 0x007A/*'z'*/))) ||
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PatternProps::isWhiteSpace(c)) {
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quoteBuf.append(c);
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// Double ' within a quote
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if (c == APOSTROPHE) {
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quoteBuf.append(c);
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}
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}
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// Otherwise just append
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else {
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rule.append(c);
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}
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}
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void ICU_Utility::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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for (int32_t i=0; i<text.length(); ++i) {
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appendToRule(rule, text[i], isLiteral, escapeUnprintable, quoteBuf);
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}
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}
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/**
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* Given a matcher reference, which may be null, append its
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* pattern as a literal to the given rule.
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*/
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void ICU_Utility::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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if (matcher != NULL) {
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UnicodeString pat;
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appendToRule(rule, matcher->toPattern(pat, escapeUnprintable),
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true, escapeUnprintable, quoteBuf);
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}
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}
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U_NAMESPACE_END
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