Index: icu46/source/common/util_props.cpp |
=================================================================== |
--- icu46/source/common/util_props.cpp (revision 0) |
+++ icu46/source/common/util_props.cpp (revision 0) |
@@ -0,0 +1,214 @@ |
+/* |
+********************************************************************** |
+* Copyright (c) 2001-2006, International Business Machines |
+* Corporation and others. All Rights Reserved. |
+********************************************************************** |
+* Date Name Description |
+* 11/19/2001 aliu Creation. |
+********************************************************************** |
+*/ |
+ |
+#include "util.h" |
+#include "unicode/uchar.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 (!uprv_isRuleWhiteSpace(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() and |
+ * !uprv_isRuleWhiteSpace(str.char32At(pos)). 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()); |
+ // assert(!uprv_isRuleWhiteSpace(str.char32At(pos))); |
+ 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 += UTF_CHAR_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 |
+ |
Property changes on: icu46/source/common/util_props.cpp |
___________________________________________________________________ |
Added: svn:eol-style |
+ LF |