--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/fontservices/textshaperplugin/IcuSource/common/util.h Tue Feb 02 02:02:46 2010 +0200
@@ -0,0 +1,248 @@
+/*
+**********************************************************************
+* Copyright (c) 2001-2005, International Business Machines
+* Corporation and others. All Rights Reserved.
+**********************************************************************
+* Date Name Description
+* 11/19/2001 aliu Creation.
+**********************************************************************
+*/
+#ifndef ICU_UTIL_H
+#define ICU_UTIL_H
+
+#include "unicode/utypes.h"
+#include "unicode/uobject.h"
+#include "unicode/unistr.h"
+
+//--------------------------------------------------------------------
+// class ICU_Utility
+// i18n utility functions, scoped into the class ICU_Utility.
+//--------------------------------------------------------------------
+
+U_NAMESPACE_BEGIN
+
+class UnicodeMatcher;
+
+class U_COMMON_API ICU_Utility /* not : public UObject because all methods are static */ {
+ public:
+
+ /**
+ * Append a number to the given UnicodeString in the given radix.
+ * Standard digits '0'-'9' are used and letters 'A'-'Z' for
+ * radices 11 through 36.
+ * @param result the digits of the number are appended here
+ * @param n the number to be converted to digits; may be negative.
+ * If negative, a '-' is prepended to the digits.
+ * @param radix a radix from 2 to 36 inclusive.
+ * @param minDigits the minimum number of digits, not including
+ * any '-', to produce. Values less than 2 have no effect. One
+ * digit is always emitted regardless of this parameter.
+ * @return a reference to result
+ */
+ static UnicodeString& appendNumber(UnicodeString& result, int32_t n,
+ int32_t radix = 10,
+ int32_t minDigits = 1);
+
+ /**
+ * Return true if the character is NOT printable ASCII.
+ *
+ * This method should really be in UnicodeString (or similar). For
+ * now, we implement it here and share it with friend classes.
+ */
+ static UBool isUnprintable(UChar32 c);
+
+ /**
+ * 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.
+ */
+ static UBool escapeUnprintable(UnicodeString& result, UChar32 c);
+
+ /**
+ * 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'.
+ * @param text text to be searched
+ * @param start the beginning index, inclusive; <code>0 <= start
+ * <= limit</code>.
+ * @param limit the ending index, exclusive; <code>start <= limit
+ * <= text.length()</code>.
+ * @param c character to search for
+ * @return Offset of the first instance of c, or -1 if not found.
+ */
+//?FOR FUTURE USE. DISABLE FOR NOW for coverage reasons.
+// static int32_t quotedIndexOf(const UnicodeString& text,
+// int32_t start, int32_t limit,
+// UChar c);
+
+ /**
+ * 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.
+ */
+ static int32_t skipWhitespace(const UnicodeString& str, int32_t& pos,
+ UBool advance = FALSE);
+
+ /**
+ * Skip over whitespace in a Replaceable. Whitespace is defined by
+ * uprv_isRuleWhiteSpace(). 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.
+//? static int32_t skipWhitespace(const Replaceable& text,
+//? int32_t pos, int32_t stop);
+
+ /**
+ * 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.
+ */
+ static UBool parseChar(const UnicodeString& id, int32_t& pos, UChar ch);
+
+ /**
+ * 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
+ */
+ static int32_t parsePattern(const UnicodeString& rule, int32_t pos, int32_t limit,
+ const UnicodeString& pattern, int32_t* parsedInts);
+
+ /**
+ * 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 uprv_isRuleWhiteSpace 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.
+ */
+ static int32_t parsePattern(const UnicodeString& pat,
+ const Replaceable& text,
+ int32_t index,
+ int32_t limit);
+
+ /**
+ * 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.
+ */
+ static int32_t parseInteger(const UnicodeString& rule, int32_t& pos, int32_t limit);
+
+ /**
+ * 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
+ * !UCharacter::isWhitespace(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.
+ */
+ static UnicodeString parseUnicodeIdentifier(const UnicodeString& str, int32_t& pos);
+
+ /**
+ * 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 is the
+ * offset within text at which to start parsing; it should point
+ * to a valid digit. On exit, pos 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 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.
+ */
+ static int32_t parseNumber(const UnicodeString& text,
+ int32_t& pos, int8_t radix);
+
+ static void appendToRule(UnicodeString& rule,
+ UChar32 c,
+ UBool isLiteral,
+ UBool escapeUnprintable,
+ UnicodeString& quoteBuf);
+
+ static void appendToRule(UnicodeString& rule,
+ const UnicodeString& text,
+ UBool isLiteral,
+ UBool escapeUnprintable,
+ UnicodeString& quoteBuf);
+
+ static void appendToRule(UnicodeString& rule,
+ const UnicodeMatcher* matcher,
+ UBool escapeUnprintable,
+ UnicodeString& quoteBuf);
+
+private:
+ // do not instantiate
+ ICU_Utility();
+};
+
+U_NAMESPACE_END
+
+/**
+ * Is this character a "white space" in the sense of ICU rule parsers?
+ * Equivalent to test for Pattern_White_Space Unicode property.
+ * Stable set of characters, won't change.
+ * See UAX #31 Identifier and Pattern Syntax: http://www.unicode.org/reports/tr31/
+ * @internal
+ */
+U_CAPI UBool U_EXPORT2
+uprv_isRuleWhiteSpace(UChar32 c);
+
+#endif
+//eof