499 lines
17 KiB
C++
499 lines
17 KiB
C++
/*
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**********************************************************************
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* Copyright (c) 2001, 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 "util.h"
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#include "unicode/uchar.h"
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#include "unicode/unimatch.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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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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static const UChar HEX[16] = {48,49,50,51,52,53,54,55, // 0-7
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56,57,65,66,67,68,69,70}; // 8-9 A-F
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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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UBool ICU_Utility::isUnprintable(UChar32 c) {
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return !(c == 0x0A || (c >= 0x20 && c <= 0x7E));
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}
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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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UBool ICU_Utility::escapeUnprintable(UnicodeString& result, UChar32 c) {
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if (isUnprintable(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(HEX[0xF&(c>>28)]);
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result.append(HEX[0xF&(c>>24)]);
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result.append(HEX[0xF&(c>>20)]);
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result.append(HEX[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(HEX[0xF&(c>>12)]);
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result.append(HEX[0xF&(c>>8)]);
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result.append(HEX[0xF&(c>>4)]);
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result.append(HEX[0xF&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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/**
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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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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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* 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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while (p < str.length()) {
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UChar32 c = str.char32At(p);
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if (!u_isWhitespace(c)) {
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break;
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}
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p += UTF_CHAR_LENGTH(c);
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}
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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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* 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 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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int32_t ICU_Utility::parsePattern(const UnicodeString& rule, int32_t pos, int32_t limit,
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const UnicodeString& pattern, int32_t* parsedInts) {
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// TODO Update this to handle surrogates
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int32_t p;
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int32_t intCount = 0; // number of integers parsed
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for (int32_t i=0; i<pattern.length(); ++i) {
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UChar cpat = pattern.charAt(i);
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UChar c;
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switch (cpat) {
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case 32 /*' '*/:
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if (pos >= limit) {
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return -1;
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}
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c = rule.charAt(pos++);
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if (!u_isWhitespace(c)) {
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return -1;
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}
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// FALL THROUGH to skipWhitespace
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case 126 /*'~'*/:
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pos = skipWhitespace(rule, pos);
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break;
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case 35 /*'#'*/:
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p = pos;
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parsedInts[intCount++] = parseInteger(rule, p, limit);
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if (p == pos) {
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// Syntax error; failed to parse integer
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return -1;
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}
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pos = p;
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break;
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default:
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if (pos >= limit) {
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return -1;
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}
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c = (UChar) u_tolower(rule.charAt(pos++));
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if (c != cpat) {
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return -1;
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}
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break;
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}
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}
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return pos;
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}
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static const UChar ZERO_X[] = {48, 120, 0}; // "0x"
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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 first
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* character to parse. On output, the character after the last
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* parsed character.
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*/
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int32_t ICU_Utility::parseInteger(const UnicodeString& rule, int32_t& pos, int32_t limit) {
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int32_t count = 0;
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int32_t value = 0;
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int32_t p = pos;
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int8_t radix = 10;
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if (0 == rule.caseCompare(p, 2, ZERO_X, U_FOLD_CASE_DEFAULT)) {
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p += 2;
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radix = 16;
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} else if (p < limit && rule.charAt(p) == 48 /*0*/) {
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p++;
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count = 1;
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radix = 8;
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}
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while (p < limit) {
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int32_t d = u_digit(rule.charAt(p++), radix);
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if (d < 0) {
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--p;
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break;
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}
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++count;
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int32_t v = (value * radix) + d;
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if (v <= value) {
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// If there are too many input digits, at some point
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// the value will go negative, e.g., if we have seen
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// "0x8000000" already and there is another '0', when
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// we parse the next 0 the value will go negative.
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return 0;
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}
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value = v;
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}
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if (count > 0) {
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pos = p;
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}
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return value;
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}
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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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UnicodeString ICU_Utility::parseUnicodeIdentifier(const UnicodeString& str, int32_t& pos) {
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// assert(pos < str.length());
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// assert(!UCharacter::isWhitespace(str.char32At(pos)));
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UnicodeString buf;
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int p = pos;
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while (p < str.length()) {
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UChar32 ch = str.char32At(p);
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if (buf.length() == 0) {
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if (u_isIDStart(ch)) {
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buf.append(ch);
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} else {
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buf.truncate(0);
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return buf;
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}
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} else {
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if (u_isIDPart(ch)) {
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buf.append(ch);
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} else {
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break;
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}
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}
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p += UTF_CHAR_LENGTH(ch);
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}
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pos = p;
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return buf;
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}
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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[0] 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[0] 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[0] 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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int32_t ICU_Utility::parseNumber(const UnicodeString& text,
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int32_t& pos, int8_t radix) {
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// assert(pos[0] >= 0);
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// assert(radix >= 2);
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// assert(radix <= 36);
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int32_t n = 0;
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int32_t p = pos;
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while (p < text.length()) {
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UChar32 ch = text.char32At(p);
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int32_t d = u_digit(ch, radix);
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if (d < 0) {
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break;
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}
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n = radix*n + d;
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// ASSUME that when a 32-bit integer overflows it becomes
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// negative. E.g., 214748364 * 10 + 8 => negative value.
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if (n < 0) {
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return -1;
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}
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++p;
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}
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if (p == pos) {
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return -1;
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}
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pos = p;
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return n;
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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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u_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;
|
|
appendToRule(rule, matcher->toPattern(pat, escapeUnprintable),
|
|
TRUE, escapeUnprintable, quoteBuf);
|
|
}
|
|
}
|
|
|
|
//eof
|