The Tor Browser: intl/icu/source/common/util_props.cpp@fc2d59ddac77 (annotated)

intl/icu/source/common/util_props.cpp@fc2d59ddac77 (annotated)

intl/icu/source/common/util_props.cpp

Wed, 31 Dec 2014 07:22:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 07:22:50 +0100
branch: TOR_BUG_3246
changeset 4: fc2d59ddac77
permissions: -rw-r--r--

Correct previous dual key logic pending first delivery installment.

 /*
 **********************************************************************
 *   Copyright (c) 2001-2011, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 **********************************************************************
 *   Date        Name        Description
 *   11/19/2001  aliu        Creation.
 **********************************************************************
 */
 #include "unicode/uchar.h"
 #include "unicode/utf16.h"
 #include "patternprops.h"
 #include "util.h"
 U_NAMESPACE_BEGIN
 /**
  * Parse an integer at pos, either of the form \d+ or of the form
  * 0x[0-9A-Fa-f]+ or 0[0-7]+, that is, in standard decimal, hex,
  * or octal format.
  * @param pos INPUT-OUTPUT parameter.  On input, the first
  * character to parse.  On output, the character after the last
  * parsed character.
  */
 int32_t ICU_Utility::parseInteger(const UnicodeString& rule, int32_t& pos, int32_t limit) {
     int32_t count = 0;
     int32_t value = 0;
     int32_t p = pos;
     int8_t radix = 10;
     if (p < limit && rule.charAt(p) == 48 /*0*/) {
         if (p+1 < limit && (rule.charAt(p+1) == 0x78 /*x*/ || rule.charAt(p+1) == 0x58 /*X*/)) {
             p += 2;
             radix = 16;
         }
         else {
             p++;
             count = 1;
             radix = 8;
         }
     }
     while (p < limit) {
         int32_t d = u_digit(rule.charAt(p++), radix);
         if (d < 0) {
             --p;
             break;
         }
         ++count;
         int32_t v = (value * radix) + d;
         if (v <= value) {
             // If there are too many input digits, at some point
             // the value will go negative, e.g., if we have seen
             // "0x8000000" already and there is another '0', when
             // we parse the next 0 the value will go negative.
             return 0;
         }
         value = v;
     }
     if (count > 0) {
         pos = p;
     }
     return value;
 }
 /**
  * Parse a pattern string starting at offset pos.  Keywords are
  * matched case-insensitively.  Spaces may be skipped and may be
  * optional or required.  Integer values may be parsed, and if
  * they are, they will be returned in the given array.  If
  * successful, the offset of the next non-space character is
  * returned.  On failure, -1 is returned.
  * @param pattern must only contain lowercase characters, which
  * will match their uppercase equivalents as well.  A space
  * character matches one or more required spaces.  A '~' character
  * matches zero or more optional spaces.  A '#' character matches
  * an integer and stores it in parsedInts, which the caller must
  * ensure has enough capacity.
  * @param parsedInts array to receive parsed integers.  Caller
  * must ensure that parsedInts.length is >= the number of '#'
  * signs in 'pattern'.
  * @return the position after the last character parsed, or -1 if
  * the parse failed
  */
 int32_t ICU_Utility::parsePattern(const UnicodeString& rule, int32_t pos, int32_t limit,
                               const UnicodeString& pattern, int32_t* parsedInts) {
     // TODO Update this to handle surrogates
     int32_t p;
     int32_t intCount = 0; // number of integers parsed
     for (int32_t i=0; i<pattern.length(); ++i) {
         UChar cpat = pattern.charAt(i);
         UChar c;
         switch (cpat) {
         case 32 /*' '*/:
             if (pos >= limit) {
                 return -1;
             }
             c = rule.charAt(pos++);
             if (!PatternProps::isWhiteSpace(c)) {
                 return -1;
             }
             // FALL THROUGH to skipWhitespace
         case 126 /*'~'*/:
             pos = skipWhitespace(rule, pos);
             break;
         case 35 /*'#'*/:
             p = pos;
             parsedInts[intCount++] = parseInteger(rule, p, limit);
             if (p == pos) {
                 // Syntax error; failed to parse integer
                 return -1;
             }
             pos = p;
             break;
         default:
             if (pos >= limit) {
                 return -1;
             }
             c = (UChar) u_tolower(rule.charAt(pos++));
             if (c != cpat) {
                 return -1;
             }
             break;
         }
     }
     return pos;
 }
 /**
  * Parse a Unicode identifier from the given string at the given
  * position.  Return the identifier, or an empty string if there
  * is no identifier.
  * @param str the string to parse
  * @param pos INPUT-OUPUT parameter.  On INPUT, pos is the
  * first character to examine.  It must be less than str.length(),
  * and it must not point to a whitespace character.  That is, must
  * have pos < str.length().  On
  * OUTPUT, the position after the last parsed character.
  * @return the Unicode identifier, or an empty string if there is
  * no valid identifier at pos.
  */
 UnicodeString ICU_Utility::parseUnicodeIdentifier(const UnicodeString& str, int32_t& pos) {
     // assert(pos < str.length());
     UnicodeString buf;
     int p = pos;
     while (p < str.length()) {
         UChar32 ch = str.char32At(p);
         if (buf.length() == 0) {
             if (u_isIDStart(ch)) {
                 buf.append(ch);
             } else {
                 buf.truncate(0);
                 return buf;
             }
         } else {
             if (u_isIDPart(ch)) {
                 buf.append(ch);
             } else {
                 break;
             }
         }
         p += U16_LENGTH(ch);
     }
     pos = p;
     return buf;
 }
 /**
  * Parse an unsigned 31-bit integer at the given offset.  Use
  * UCharacter.digit() to parse individual characters into digits.
  * @param text the text to be parsed
  * @param pos INPUT-OUTPUT parameter.  On entry, pos[0] is the
  * offset within text at which to start parsing; it should point
  * to a valid digit.  On exit, pos[0] is the offset after the last
  * parsed character.  If the parse failed, it will be unchanged on
  * exit.  Must be >= 0 on entry.
  * @param radix the radix in which to parse; must be >= 2 and <=
  * 36.
  * @return a non-negative parsed number, or -1 upon parse failure.
  * Parse fails if there are no digits, that is, if pos[0] does not
  * point to a valid digit on entry, or if the number to be parsed
  * does not fit into a 31-bit unsigned integer.
  */
 int32_t ICU_Utility::parseNumber(const UnicodeString& text,
                                  int32_t& pos, int8_t radix) {
     // assert(pos[0] >= 0);
     // assert(radix >= 2);
     // assert(radix <= 36);
     int32_t n = 0;
     int32_t p = pos;
     while (p < text.length()) {
         UChar32 ch = text.char32At(p);
         int32_t d = u_digit(ch, radix);
         if (d < 0) {
             break;
         }
         n = radix*n + d;
         // ASSUME that when a 32-bit integer overflows it becomes
         // negative.  E.g., 214748364 * 10 + 8 => negative value.
         if (n < 0) {
             return -1;
         }
         ++p;
     }
     if (p == pos) {
         return -1;
     }
     pos = p;
     return n;
 }
 U_NAMESPACE_END

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intl/icu/source/common/util_props.cpp@fc2d59ddac77 (annotated)

intl/icu/source/common/util_props.cpp