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Diffstat (limited to 'intl/lwbrk/nsJISx4051LineBreaker.cpp')
| -rw-r--r-- | intl/lwbrk/nsJISx4051LineBreaker.cpp | 999 |
1 files changed, 999 insertions, 0 deletions
diff --git a/intl/lwbrk/nsJISx4051LineBreaker.cpp b/intl/lwbrk/nsJISx4051LineBreaker.cpp new file mode 100644 index 000000000..1b262fa2c --- /dev/null +++ b/intl/lwbrk/nsJISx4051LineBreaker.cpp @@ -0,0 +1,999 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + + + +#include "nsJISx4051LineBreaker.h" + +#include "jisx4051class.h" +#include "nsComplexBreaker.h" +#include "nsTArray.h" +#include "nsUnicodeProperties.h" + +/* + + Simplification of Pair Table in JIS X 4051 + + 1. The Origion Table - in 4.1.3 + + In JIS x 4051. The pair table is defined as below + + Class of + Leading Class of Trailing Char Class + Char + + 1 2 3 4 5 6 7 8 9 10 11 12 13 13 14 14 15 16 17 18 19 20 + * # * # + 1 X X X X X X X X X X X X X X X X X X X X X E + 2 X X X X X X + 3 X X X X X X + 4 X X X X X X + 5 X X X X X X + 6 X X X X X X + 7 X X X X X X X + 8 X X X X X X E + 9 X X X X X X + 10 X X X X X X + 11 X X X X X X + 12 X X X X X X + 13 X X X X X X X + 14 X X X X X X X + 15 X X X X X X X X X + 16 X X X X X X X X + 17 X X X X X E + 18 X X X X X X X X X + 19 X E E E E E X X X X X X X X X X X X E X E E + 20 X X X X X E + + * Same Char + # Other Char + + X Cannot Break + + The classes mean: + 1: Open parenthesis + 2: Close parenthesis + 3: Prohibit a line break before + 4: Punctuation for sentence end (except Full stop, e.g., "!" and "?") + 5: Middle dot (e.g., U+30FB KATAKANA MIDDLE DOT) + 6: Full stop + 7: Non-breakable between same characters + 8: Prefix (e.g., "$", "NO.") + 9: Postfix (e.g., "%") + 10: Ideographic space + 11: Hiragana + 12: Japanese characters (except class 11) + 13: Subscript + 14: Ruby + 15: Numeric + 16: Alphabet + 17: Space for Western language + 18: Western characters (except class 17) + 19: Split line note (Warichu) begin quote + 20: Split line note (Warichu) end quote + + 2. Simplified by remove the class which we do not care + + However, since we do not care about class 13(Subscript), 14(Ruby), + 16 (Aphabet), 19(split line note begin quote), and 20(split line note end + quote) we can simplify this par table into the following + + Class of + Leading Class of Trailing Char Class + Char + + 1 2 3 4 5 6 7 8 9 10 11 12 15 17 18 + + 1 X X X X X X X X X X X X X X X + 2 X X X X X + 3 X X X X X + 4 X X X X X + 5 X X X X X + 6 X X X X X + 7 X X X X X X + 8 X X X X X X + 9 X X X X X + 10 X X X X X + 11 X X X X X + 12 X X X X X + 15 X X X X X X X X + 17 X X X X X + 18 X X X X X X X + + 3. Simplified by merged classes + + After the 2 simplification, the pair table have some duplication + a. class 2, 3, 4, 5, 6, are the same- we can merged them + b. class 10, 11, 12, 17 are the same- we can merged them + + + Class of + Leading Class of Trailing Char Class + Char + + 1 [a] 7 8 9 [b]15 18 + + 1 X X X X X X X X + [a] X + 7 X X + 8 X X + 9 X + [b] X + 15 X X X X + 18 X X X + + + 4. We add COMPLEX characters and make it breakable w/ all ther class + except after class 1 and before class [a] + + Class of + Leading Class of Trailing Char Class + Char + + 1 [a] 7 8 9 [b]15 18 COMPLEX + + 1 X X X X X X X X X + [a] X + 7 X X + 8 X X + 9 X + [b] X + 15 X X X X + 18 X X X + COMPLEX X T + + T : need special handling + + + 5. However, we need two special class for some punctuations/parentheses, + theirs breaking rules like character class (18), see bug 389056. + And also we need character like punctuation that is same behavior with 18, + but the characters are not letters of all languages. (e.g., '_') + [c]. Based on open parenthesis class (1), but it is not breakable after + character class (18) or numeric class (15). + [d]. Based on close parenthesis (or punctuation) class (2), but it is not + breakable before character class (18) or numeric class (15). + + Class of + Leading Class of Trailing Char Class + Char + + 1 [a] 7 8 9 [b]15 18 COMPLEX [c] [d] + + 1 X X X X X X X X X X X + [a] X X X + 7 X X + 8 X X + 9 X + [b] X X + 15 X X X X X X + 18 X X X X X + COMPLEX X T + [c] X X X X X X X X X X X + [d] X X X X + + + 6. And Unicode has "NON-BREAK" characters. The lines should be broken around + them. But in JIS X 4051, such class is not, therefore, we create [e]. + + Class of + Leading Class of Trailing Char Class + Char + + 1 [a] 7 8 9 [b]15 18 COMPLEX [c] [d] [e] + + 1 X X X X X X X X X X X X + [a] X X X + 7 X X X + 8 X X X + 9 X X + [b] X X X + 15 X X X X X X X + 18 X X X X X X + COMPLEX X T X + [c] X X X X X X X X X X X X + [d] X X X X X + [e] X X X X X X X X X X X X + + + 7. Now we use one bit to encode weather it is breakable, and use 2 bytes + for one row, then the bit table will look like: + + 18 <- 1 + + 1 0000 1111 1111 1111 = 0x0FFF + [a] 0000 1100 0000 0010 = 0x0C02 + 7 0000 1000 0000 0110 = 0x0806 + 8 0000 1000 0100 0010 = 0x0842 + 9 0000 1000 0000 0010 = 0x0802 + [b] 0000 1100 0000 0010 = 0x0C02 + 15 0000 1110 1101 0010 = 0x0ED2 + 18 0000 1110 1100 0010 = 0x0EC2 + COMPLEX 0000 1001 0000 0010 = 0x0902 + [c] 0000 1111 1111 1111 = 0x0FFF + [d] 0000 1100 1100 0010 = 0x0CC2 + [e] 0000 1111 1111 1111 = 0x0FFF +*/ + +#define MAX_CLASSES 12 + +static const uint16_t gPair[MAX_CLASSES] = { + 0x0FFF, + 0x0C02, + 0x0806, + 0x0842, + 0x0802, + 0x0C02, + 0x0ED2, + 0x0EC2, + 0x0902, + 0x0FFF, + 0x0CC2, + 0x0FFF +}; + + +/* + + 8. And if the character is not enough far from word start, word end and + another break point, we should not break in non-CJK languages. + I.e., Don't break around 15, 18, [c] and [d], but don't change + that if they are related to [b]. + + Class of + Leading Class of Trailing Char Class + Char + + 1 [a] 7 8 9 [b]15 18 COMPLEX [c] [d] [e] + + 1 X X X X X X X X X X X X + [a] X X X X X X + 7 X X X X X X X + 8 X X X X X X + 9 X X X X X X + [b] X X X + 15 X X X X X X X X X X X + 18 X X X X X X X X X X X + COMPLEX X X X T X X X + [c] X X X X X X X X X X X X + [d] X X X X X X X X X X X + [e] X X X X X X X X X X X X + + 18 <- 1 + + 1 0000 1111 1111 1111 = 0x0FFF + [a] 0000 1110 1100 0010 = 0x0EC2 + 7 0000 1110 1100 0110 = 0x0EC6 + 8 0000 1110 1100 0010 = 0x0EC2 + 9 0000 1110 1100 0010 = 0x0EC2 + [b] 0000 1100 0000 0010 = 0x0C02 + 15 0000 1111 1101 1111 = 0x0FDF + 18 0000 1111 1101 1111 = 0x0FDF + COMPLEX 0000 1111 1100 0010 = 0x0FC2 + [c] 0000 1111 1111 1111 = 0x0FFF + [d] 0000 1111 1101 1111 = 0x0FDF + [e] 0000 1111 1111 1111 = 0x0FFF +*/ + +static const uint16_t gPairConservative[MAX_CLASSES] = { + 0x0FFF, + 0x0EC2, + 0x0EC6, + 0x0EC2, + 0x0EC2, + 0x0C02, + 0x0FDF, + 0x0FDF, + 0x0FC2, + 0x0FFF, + 0x0FDF, + 0x0FFF +}; + + +/* + + 9. Now we map the class to number + + 0: 1 + 1: [a]- 2, 3, 4, 5, 6 + 2: 7 + 3: 8 + 4: 9 + 5: [b]- 10, 11, 12, 17 + 6: 15 + 7: 18 + 8: COMPLEX + 9: [c] + A: [d] + B: [e] + + and they mean: + 0: Open parenthesis + 1: Punctuation that prohibits break before + 2: Non-breakable between same classes + 3: Prefix + 4: Postfix + 5: Breakable character (Spaces and Most Japanese characters) + 6: Numeric + 7: Characters + 8: Need special handling characters (E.g., Thai) + 9: Open parentheses like Character (See bug 389056) + A: Close parenthese (or punctuations) like Character (See bug 389056) + B: Non breakable (See bug 390920) + +*/ + +#define CLASS_NONE INT8_MAX + +#define CLASS_OPEN 0x00 +#define CLASS_CLOSE 0x01 +#define CLASS_NON_BREAKABLE_BETWEEN_SAME_CLASS 0x02 +#define CLASS_PREFIX 0x03 +#define CLASS_POSTFFIX 0x04 +#define CLASS_BREAKABLE 0x05 +#define CLASS_NUMERIC 0x06 +#define CLASS_CHARACTER 0x07 +#define CLASS_COMPLEX 0x08 +#define CLASS_OPEN_LIKE_CHARACTER 0x09 +#define CLASS_CLOSE_LIKE_CHARACTER 0x0A +#define CLASS_NON_BREAKABLE 0x0B + +#define U_NULL char16_t(0x0000) +#define U_SLASH char16_t('/') +#define U_SPACE char16_t(' ') +#define U_HYPHEN char16_t('-') +#define U_EQUAL char16_t('=') +#define U_PERCENT char16_t('%') +#define U_AMPERSAND char16_t('&') +#define U_SEMICOLON char16_t(';') +#define U_BACKSLASH char16_t('\\') +#define U_OPEN_SINGLE_QUOTE char16_t(0x2018) +#define U_OPEN_DOUBLE_QUOTE char16_t(0x201C) +#define U_OPEN_GUILLEMET char16_t(0x00AB) + +#define NEED_CONTEXTUAL_ANALYSIS(c) (IS_HYPHEN(c) || \ + (c) == U_SLASH || \ + (c) == U_PERCENT || \ + (c) == U_AMPERSAND || \ + (c) == U_SEMICOLON || \ + (c) == U_BACKSLASH || \ + (c) == U_OPEN_SINGLE_QUOTE || \ + (c) == U_OPEN_DOUBLE_QUOTE || \ + (c) == U_OPEN_GUILLEMET) + +#define IS_ASCII_DIGIT(u) (0x0030 <= (u) && (u) <= 0x0039) + +static inline int +GETCLASSFROMTABLE(const uint32_t* t, uint16_t l) +{ + return ((((t)[(l>>3)]) >> ((l & 0x0007)<<2)) & 0x000f); +} + +static inline int +IS_HALFWIDTH_IN_JISx4051_CLASS3(char16_t u) +{ + return ((0xff66 <= (u)) && ((u) <= 0xff70)); +} + +static inline int +IS_CJK_CHAR(char16_t u) +{ + return ((0x1100 <= (u) && (u) <= 0x11ff) || + (0x2e80 <= (u) && (u) <= 0xd7ff) || + (0xf900 <= (u) && (u) <= 0xfaff) || + (0xff00 <= (u) && (u) <= 0xffef) ); +} + +static inline bool +IS_NONBREAKABLE_SPACE(char16_t u) +{ + return u == 0x00A0 || u == 0x2007; // NO-BREAK SPACE, FIGURE SPACE +} + +static inline bool +IS_HYPHEN(char16_t u) +{ + return (u == U_HYPHEN || + u == 0x058A || // ARMENIAN HYPHEN + u == 0x2010 || // HYPHEN + u == 0x2012 || // FIGURE DASH + u == 0x2013); // EN DASH +} + +static int8_t +GetClass(uint32_t u) +{ + if (u < 0x10000) { + uint16_t h = u & 0xFF00; + uint16_t l = u & 0x00ff; + + // Handle 3 range table first + if (0x0000 == h) { + return GETCLASSFROMTABLE(gLBClass00, l); + } + if (0x1700 == h) { + return GETCLASSFROMTABLE(gLBClass17, l); + } + if (NS_NeedsPlatformNativeHandling(u)) { + return CLASS_COMPLEX; + } + if (0x0E00 == h) { + return GETCLASSFROMTABLE(gLBClass0E, l); + } + if (0x2000 == h) { + return GETCLASSFROMTABLE(gLBClass20, l); + } + if (0x2100 == h) { + return GETCLASSFROMTABLE(gLBClass21, l); + } + if (0x3000 == h) { + return GETCLASSFROMTABLE(gLBClass30, l); + } + if (0xff00 == h) { + if (l < 0x0060) { // Fullwidth ASCII variant + return GETCLASSFROMTABLE(gLBClass00, (l+0x20)); + } + if (l < 0x00a0) { // Halfwidth Katakana variants + switch (l) { + case 0x61: return GetClass(0x3002); + case 0x62: return GetClass(0x300c); + case 0x63: return GetClass(0x300d); + case 0x64: return GetClass(0x3001); + case 0x65: return GetClass(0x30fb); + case 0x9e: return GetClass(0x309b); + case 0x9f: return GetClass(0x309c); + default: + if (IS_HALFWIDTH_IN_JISx4051_CLASS3(u)) { + return CLASS_CLOSE; // jis x4051 class 3 + } + return CLASS_BREAKABLE; // jis x4051 class 11 + } + } + if (l < 0x00e0) { + return CLASS_CHARACTER; // Halfwidth Hangul variants + } + if (l < 0x00f0) { + static char16_t NarrowFFEx[16] = { + 0x00A2, 0x00A3, 0x00AC, 0x00AF, 0x00A6, 0x00A5, 0x20A9, 0x0000, + 0x2502, 0x2190, 0x2191, 0x2192, 0x2193, 0x25A0, 0x25CB, 0x0000 + }; + return GetClass(NarrowFFEx[l - 0x00e0]); + } + } else if (0x3100 == h) { + if (l <= 0xbf) { // Hangul Compatibility Jamo, Bopomofo, Kanbun + // XXX: This is per UAX #14, but UAX #14 may change + // the line breaking rules about Kanbun and Bopomofo. + return CLASS_BREAKABLE; + } + if (l >= 0xf0) { // Katakana small letters for Ainu + return CLASS_CLOSE; + } + } else if (0x0300 == h) { + if (0x4F == l || (0x5C <= l && l <= 0x62)) { + return CLASS_NON_BREAKABLE; + } + } else if (0x0500 == h) { + // ARMENIAN HYPHEN (for "Breaking Hyphens" of UAX#14) + if (l == 0x8A) { + return GETCLASSFROMTABLE(gLBClass00, uint16_t(U_HYPHEN)); + } + } else if (0x0F00 == h) { + if (0x08 == l || 0x0C == l || 0x12 == l) { + return CLASS_NON_BREAKABLE; + } + } else if (0x1800 == h) { + if (0x0E == l) { + return CLASS_NON_BREAKABLE; + } + } else if (0x1600 == h) { + if (0x80 == l) { // U+1680 OGHAM SPACE MARK + return CLASS_BREAKABLE; + } + } else if (u == 0xfeff) { + return CLASS_NON_BREAKABLE; + } + } + + // Mapping for Unicode LineBreak.txt classes to the (simplified) set of + // character classes used here. + // XXX The mappings here were derived by comparing the Unicode LineBreak + // values of BMP characters to the classes our existing GetClass returns + // for the same codepoints; in cases where characters with the same + // LineBreak class mapped to various classes here, I picked what seemed + // the most prevalent equivalence. + // Some of these are unclear to me, but currently they are ONLY used + // for characters not handled by the old code above, so all the JISx405 + // special cases should already be accounted for. + static const int8_t sUnicodeLineBreakToClass[] = { + /* UNKNOWN = 0, [XX] */ CLASS_CHARACTER, + /* AMBIGUOUS = 1, [AI] */ CLASS_CHARACTER, + /* ALPHABETIC = 2, [AL] */ CLASS_CHARACTER, + /* BREAK_BOTH = 3, [B2] */ CLASS_CHARACTER, + /* BREAK_AFTER = 4, [BA] */ CLASS_CHARACTER, + /* BREAK_BEFORE = 5, [BB] */ CLASS_OPEN_LIKE_CHARACTER, + /* MANDATORY_BREAK = 6, [BK] */ CLASS_CHARACTER, + /* CONTINGENT_BREAK = 7, [CB] */ CLASS_CHARACTER, + /* CLOSE_PUNCTUATION = 8, [CL] */ CLASS_CHARACTER, + /* COMBINING_MARK = 9, [CM] */ CLASS_CHARACTER, + /* CARRIAGE_RETURN = 10, [CR] */ CLASS_BREAKABLE, + /* EXCLAMATION = 11, [EX] */ CLASS_CHARACTER, + /* GLUE = 12, [GL] */ CLASS_NON_BREAKABLE, + /* HYPHEN = 13, [HY] */ CLASS_CHARACTER, + /* IDEOGRAPHIC = 14, [ID] */ CLASS_BREAKABLE, + /* INSEPARABLE = 15, [IN] */ CLASS_CLOSE_LIKE_CHARACTER, + /* INFIX_NUMERIC = 16, [IS] */ CLASS_CHARACTER, + /* LINE_FEED = 17, [LF] */ CLASS_BREAKABLE, + /* NONSTARTER = 18, [NS] */ CLASS_CLOSE_LIKE_CHARACTER, + /* NUMERIC = 19, [NU] */ CLASS_CHARACTER, + /* OPEN_PUNCTUATION = 20, [OP] */ CLASS_CHARACTER, + /* POSTFIX_NUMERIC = 21, [PO] */ CLASS_CHARACTER, + /* PREFIX_NUMERIC = 22, [PR] */ CLASS_CHARACTER, + /* QUOTATION = 23, [QU] */ CLASS_CHARACTER, + /* COMPLEX_CONTEXT = 24, [SA] */ CLASS_CHARACTER, + /* SURROGATE = 25, [SG] */ CLASS_CHARACTER, + /* SPACE = 26, [SP] */ CLASS_BREAKABLE, + /* BREAK_SYMBOLS = 27, [SY] */ CLASS_CHARACTER, + /* ZWSPACE = 28, [ZW] */ CLASS_BREAKABLE, + /* NEXT_LINE = 29, [NL] */ CLASS_CHARACTER, + /* WORD_JOINER = 30, [WJ] */ CLASS_NON_BREAKABLE, + /* H2 = 31, [H2] */ CLASS_BREAKABLE, + /* H3 = 32, [H3] */ CLASS_BREAKABLE, + /* JL = 33, [JL] */ CLASS_CHARACTER, + /* JT = 34, [JT] */ CLASS_CHARACTER, + /* JV = 35, [JV] */ CLASS_CHARACTER, + /* CLOSE_PARENTHESIS = 36, [CP] */ CLASS_CLOSE_LIKE_CHARACTER, + /* CONDITIONAL_JAPANESE_STARTER = 37, [CJ] */ CLASS_CLOSE, + /* HEBREW_LETTER = 38, [HL] */ CLASS_CHARACTER, + /* REGIONAL_INDICATOR = 39, [RI] */ CLASS_CHARACTER, + /* E_BASE = 40, [EB] */ CLASS_BREAKABLE, + /* E_MODIFIER = 41, [EM] */ CLASS_CHARACTER, + /* ZWJ = 42, [ZWJ]*/ CLASS_CHARACTER + }; + +#if ENABLE_INTL_API + static_assert(U_LB_COUNT == mozilla::ArrayLength(sUnicodeLineBreakToClass), + "Gecko vs ICU LineBreak class mismatch"); +#endif + + auto cls = mozilla::unicode::GetLineBreakClass(u); + MOZ_ASSERT(cls < mozilla::ArrayLength(sUnicodeLineBreakToClass)); + return sUnicodeLineBreakToClass[cls]; +} + +static bool +GetPair(int8_t c1, int8_t c2) +{ + NS_ASSERTION(c1 < MAX_CLASSES ,"illegal classes 1"); + NS_ASSERTION(c2 < MAX_CLASSES ,"illegal classes 2"); + + return (0 == ((gPair[c1] >> c2) & 0x0001)); +} + +static bool +GetPairConservative(int8_t c1, int8_t c2) +{ + NS_ASSERTION(c1 < MAX_CLASSES ,"illegal classes 1"); + NS_ASSERTION(c2 < MAX_CLASSES ,"illegal classes 2"); + + return (0 == ((gPairConservative[c1] >> c2) & 0x0001)); +} + +nsJISx4051LineBreaker::nsJISx4051LineBreaker() +{ +} + +nsJISx4051LineBreaker::~nsJISx4051LineBreaker() +{ +} + +NS_IMPL_ISUPPORTS(nsJISx4051LineBreaker, nsILineBreaker) + +class ContextState { +public: + ContextState(const char16_t* aText, uint32_t aLength) { + mUniText = aText; + mText = nullptr; + mLength = aLength; + Init(); + } + + ContextState(const uint8_t* aText, uint32_t aLength) { + mUniText = nullptr; + mText = aText; + mLength = aLength; + Init(); + } + + uint32_t Length() { return mLength; } + uint32_t Index() { return mIndex; } + + char16_t GetCharAt(uint32_t aIndex) { + NS_ASSERTION(aIndex < mLength, "Out of range!"); + return mUniText ? mUniText[aIndex] : char16_t(mText[aIndex]); + } + + void AdvanceIndex() { + ++mIndex; + } + + void NotifyBreakBefore() { mLastBreakIndex = mIndex; } + +// A word of western language should not be broken. But even if the word has +// only ASCII characters, non-natural context words should be broken, e.g., +// URL and file path. For protecting the natural words, we should use +// conservative breaking rules at following conditions: +// 1. at near the start of word +// 2. at near the end of word +// 3. at near the latest broken point +// CONSERVATIVE_BREAK_RANGE define the 'near' in characters. +#define CONSERVATIVE_BREAK_RANGE 6 + + bool UseConservativeBreaking(uint32_t aOffset = 0) { + if (mHasCJKChar) + return false; + uint32_t index = mIndex + aOffset; + bool result = (index < CONSERVATIVE_BREAK_RANGE || + mLength - index < CONSERVATIVE_BREAK_RANGE || + index - mLastBreakIndex < CONSERVATIVE_BREAK_RANGE); + if (result || !mHasNonbreakableSpace) + return result; + + // This text has no-breakable space, we need to check whether the index + // is near it. + + // Note that index is always larger than CONSERVATIVE_BREAK_RANGE here. + for (uint32_t i = index; index - CONSERVATIVE_BREAK_RANGE < i; --i) { + if (IS_NONBREAKABLE_SPACE(GetCharAt(i - 1))) + return true; + } + // Note that index is always less than mLength - CONSERVATIVE_BREAK_RANGE. + for (uint32_t i = index + 1; i < index + CONSERVATIVE_BREAK_RANGE; ++i) { + if (IS_NONBREAKABLE_SPACE(GetCharAt(i))) + return true; + } + return false; + } + + bool HasPreviousEqualsSign() const { + return mHasPreviousEqualsSign; + } + void NotifySeenEqualsSign() { + mHasPreviousEqualsSign = true; + } + + bool HasPreviousSlash() const { + return mHasPreviousSlash; + } + void NotifySeenSlash() { + mHasPreviousSlash = true; + } + + bool HasPreviousBackslash() const { + return mHasPreviousBackslash; + } + void NotifySeenBackslash() { + mHasPreviousBackslash = true; + } + + uint32_t GetPreviousNonHyphenCharacter() const { + return mPreviousNonHyphenCharacter; + } + void NotifyNonHyphenCharacter(uint32_t ch) { + mPreviousNonHyphenCharacter = ch; + } + +private: + void Init() { + mIndex = 0; + mLastBreakIndex = 0; + mPreviousNonHyphenCharacter = U_NULL; + mHasCJKChar = 0; + mHasNonbreakableSpace = 0; + mHasPreviousEqualsSign = false; + mHasPreviousSlash = false; + mHasPreviousBackslash = false; + + for (uint32_t i = 0; i < mLength; ++i) { + char16_t u = GetCharAt(i); + if (!mHasNonbreakableSpace && IS_NONBREAKABLE_SPACE(u)) + mHasNonbreakableSpace = 1; + else if (mUniText && !mHasCJKChar && IS_CJK_CHAR(u)) + mHasCJKChar = 1; + } + } + + const char16_t* mUniText; + const uint8_t* mText; + + uint32_t mIndex; + uint32_t mLength; // length of text + uint32_t mLastBreakIndex; + uint32_t mPreviousNonHyphenCharacter; // The last character we have seen + // which is not U_HYPHEN + bool mHasCJKChar; // if the text has CJK character, this is true. + bool mHasNonbreakableSpace; // if the text has no-breakable space, + // this is true. + bool mHasPreviousEqualsSign; // True if we have seen a U_EQUAL + bool mHasPreviousSlash; // True if we have seen a U_SLASH + bool mHasPreviousBackslash; // True if we have seen a U_BACKSLASH +}; + +static int8_t +ContextualAnalysis(char16_t prev, char16_t cur, char16_t next, + ContextState &aState) +{ + // Don't return CLASS_OPEN/CLASS_CLOSE if aState.UseJISX4051 is FALSE. + + if (IS_HYPHEN(cur)) { + // If next character is hyphen, we don't need to break between them. + if (IS_HYPHEN(next)) + return CLASS_CHARACTER; + // If prev and next characters are numeric, it may be in Math context. + // So, we should not break here. + bool prevIsNum = IS_ASCII_DIGIT(prev); + bool nextIsNum = IS_ASCII_DIGIT(next); + if (prevIsNum && nextIsNum) + return CLASS_NUMERIC; + // If one side is numeric and the other is a character, or if both sides are + // characters, the hyphen should be breakable. + if (!aState.UseConservativeBreaking(1)) { + char16_t prevOfHyphen = aState.GetPreviousNonHyphenCharacter(); + if (prevOfHyphen && next) { + int8_t prevClass = GetClass(prevOfHyphen); + int8_t nextClass = GetClass(next); + bool prevIsNumOrCharOrClose = + prevIsNum || + (prevClass == CLASS_CHARACTER && + !NEED_CONTEXTUAL_ANALYSIS(prevOfHyphen)) || + prevClass == CLASS_CLOSE || + prevClass == CLASS_CLOSE_LIKE_CHARACTER; + bool nextIsNumOrCharOrOpen = + nextIsNum || + (nextClass == CLASS_CHARACTER && !NEED_CONTEXTUAL_ANALYSIS(next)) || + nextClass == CLASS_OPEN || + nextClass == CLASS_OPEN_LIKE_CHARACTER || + next == U_OPEN_SINGLE_QUOTE || + next == U_OPEN_DOUBLE_QUOTE || + next == U_OPEN_GUILLEMET; + if (prevIsNumOrCharOrClose && nextIsNumOrCharOrOpen) { + return CLASS_CLOSE; + } + } + } + } else { + aState.NotifyNonHyphenCharacter(cur); + if (cur == U_SLASH || cur == U_BACKSLASH) { + // If this is immediately after same char, we should not break here. + if (prev == cur) + return CLASS_CHARACTER; + // If this text has two or more (BACK)SLASHs, this may be file path or URL. + // Make sure to compute shouldReturn before we notify on this slash. + bool shouldReturn = !aState.UseConservativeBreaking() && + (cur == U_SLASH ? + aState.HasPreviousSlash() : aState.HasPreviousBackslash()); + + if (cur == U_SLASH) { + aState.NotifySeenSlash(); + } else { + aState.NotifySeenBackslash(); + } + + if (shouldReturn) + return CLASS_OPEN; + } else if (cur == U_PERCENT) { + // If this is a part of the param of URL, we should break before. + if (!aState.UseConservativeBreaking()) { + if (aState.Index() >= 3 && + aState.GetCharAt(aState.Index() - 3) == U_PERCENT) + return CLASS_OPEN; + if (aState.Index() + 3 < aState.Length() && + aState.GetCharAt(aState.Index() + 3) == U_PERCENT) + return CLASS_OPEN; + } + } else if (cur == U_AMPERSAND || cur == U_SEMICOLON) { + // If this may be a separator of params of URL, we should break after. + if (!aState.UseConservativeBreaking(1) && + aState.HasPreviousEqualsSign()) + return CLASS_CLOSE; + } else if (cur == U_OPEN_SINGLE_QUOTE || + cur == U_OPEN_DOUBLE_QUOTE || + cur == U_OPEN_GUILLEMET) { + // for CJK usage, we treat these as openers to allow a break before them, + // but otherwise treat them as normal characters because quote mark usage + // in various Western languages varies too much; see bug #450088 discussion. + if (!aState.UseConservativeBreaking() && IS_CJK_CHAR(next)) + return CLASS_OPEN; + } else { + NS_ERROR("Forgot to handle the current character!"); + } + } + return GetClass(cur); +} + + +int32_t +nsJISx4051LineBreaker::WordMove(const char16_t* aText, uint32_t aLen, + uint32_t aPos, int8_t aDirection) +{ + bool textNeedsJISx4051 = false; + int32_t begin, end; + + for (begin = aPos; begin > 0 && !NS_IsSpace(aText[begin - 1]); --begin) { + if (IS_CJK_CHAR(aText[begin]) || NS_NeedsPlatformNativeHandling(aText[begin])) { + textNeedsJISx4051 = true; + } + } + for (end = aPos + 1; end < int32_t(aLen) && !NS_IsSpace(aText[end]); ++end) { + if (IS_CJK_CHAR(aText[end]) || NS_NeedsPlatformNativeHandling(aText[end])) { + textNeedsJISx4051 = true; + } + } + + int32_t ret; + AutoTArray<uint8_t, 2000> breakState; + if (!textNeedsJISx4051 || !breakState.AppendElements(end - begin)) { + // No complex text character, do not try to do complex line break. + // (This is required for serializers. See Bug #344816.) + // Also fall back to this when out of memory. + if (aDirection < 0) { + ret = (begin == int32_t(aPos)) ? begin - 1 : begin; + } else { + ret = end; + } + } else { + GetJISx4051Breaks(aText + begin, end - begin, nsILineBreaker::kWordBreak_Normal, + breakState.Elements()); + + ret = aPos; + do { + ret += aDirection; + } while (begin < ret && ret < end && !breakState[ret - begin]); + } + + return ret; +} + +int32_t +nsJISx4051LineBreaker::Next(const char16_t* aText, uint32_t aLen, + uint32_t aPos) +{ + NS_ASSERTION(aText, "aText shouldn't be null"); + NS_ASSERTION(aLen > aPos, "Bad position passed to nsJISx4051LineBreaker::Next"); + + int32_t nextPos = WordMove(aText, aLen, aPos, 1); + return nextPos < int32_t(aLen) ? nextPos : NS_LINEBREAKER_NEED_MORE_TEXT; +} + +int32_t +nsJISx4051LineBreaker::Prev(const char16_t* aText, uint32_t aLen, + uint32_t aPos) +{ + NS_ASSERTION(aText, "aText shouldn't be null"); + NS_ASSERTION(aLen >= aPos && aPos > 0, + "Bad position passed to nsJISx4051LineBreaker::Prev"); + + int32_t prevPos = WordMove(aText, aLen, aPos, -1); + return prevPos > 0 ? prevPos : NS_LINEBREAKER_NEED_MORE_TEXT; +} + +void +nsJISx4051LineBreaker::GetJISx4051Breaks(const char16_t* aChars, uint32_t aLength, + uint8_t aWordBreak, + uint8_t* aBreakBefore) +{ + uint32_t cur; + int8_t lastClass = CLASS_NONE; + ContextState state(aChars, aLength); + + for (cur = 0; cur < aLength; ++cur, state.AdvanceIndex()) { + uint32_t ch = aChars[cur]; + if (NS_IS_HIGH_SURROGATE(ch)) { + if (cur + 1 < aLength && NS_IS_LOW_SURROGATE(aChars[cur + 1])) { + ch = SURROGATE_TO_UCS4(ch, aChars[cur + 1]); + } + } + int8_t cl; + + if (NEED_CONTEXTUAL_ANALYSIS(ch)) { + cl = ContextualAnalysis(cur > 0 ? aChars[cur - 1] : U_NULL, + ch, + cur + 1 < aLength ? aChars[cur + 1] : U_NULL, + state); + } else { + if (ch == U_EQUAL) + state.NotifySeenEqualsSign(); + state.NotifyNonHyphenCharacter(ch); + cl = GetClass(ch); + } + + bool allowBreak = false; + if (cur > 0) { + NS_ASSERTION(CLASS_COMPLEX != lastClass || CLASS_COMPLEX != cl, + "Loop should have prevented adjacent complex chars here"); + if (aWordBreak == nsILineBreaker::kWordBreak_Normal) { + allowBreak = (state.UseConservativeBreaking()) ? + GetPairConservative(lastClass, cl) : GetPair(lastClass, cl); + } else if (aWordBreak == nsILineBreaker::kWordBreak_BreakAll) { + allowBreak = true; + } + } + aBreakBefore[cur] = allowBreak; + if (allowBreak) + state.NotifyBreakBefore(); + lastClass = cl; + if (CLASS_COMPLEX == cl) { + uint32_t end = cur + 1; + + while (end < aLength && CLASS_COMPLEX == GetClass(aChars[end])) { + ++end; + } + + NS_GetComplexLineBreaks(aChars + cur, end - cur, aBreakBefore + cur); + + // We have to consider word-break value again for complex characters + if (aWordBreak != nsILineBreaker::kWordBreak_Normal) { + // Respect word-break property + for (uint32_t i = cur; i < end; i++) + aBreakBefore[i] = (aWordBreak == nsILineBreaker::kWordBreak_BreakAll); + } + + // restore breakability at chunk begin, which was always set to false + // by the complex line breaker + aBreakBefore[cur] = allowBreak; + + cur = end - 1; + } + + if (ch > 0xffff) { + // Supplementary-plane character: mark that we cannot break before the + // trailing low surrogate, and advance past it. + ++cur; + aBreakBefore[cur] = false; + state.AdvanceIndex(); + } + } +} + +void +nsJISx4051LineBreaker::GetJISx4051Breaks(const uint8_t* aChars, uint32_t aLength, + uint8_t aWordBreak, + uint8_t* aBreakBefore) +{ + uint32_t cur; + int8_t lastClass = CLASS_NONE; + ContextState state(aChars, aLength); + + for (cur = 0; cur < aLength; ++cur, state.AdvanceIndex()) { + char16_t ch = aChars[cur]; + int8_t cl; + + if (NEED_CONTEXTUAL_ANALYSIS(ch)) { + cl = ContextualAnalysis(cur > 0 ? aChars[cur - 1] : U_NULL, + ch, + cur + 1 < aLength ? aChars[cur + 1] : U_NULL, + state); + } else { + if (ch == U_EQUAL) + state.NotifySeenEqualsSign(); + state.NotifyNonHyphenCharacter(ch); + cl = GetClass(ch); + } + + bool allowBreak = false; + if (cur > 0) { + if (aWordBreak == nsILineBreaker::kWordBreak_Normal) { + allowBreak = (state.UseConservativeBreaking()) ? + GetPairConservative(lastClass, cl) : GetPair(lastClass, cl); + } else if (aWordBreak == nsILineBreaker::kWordBreak_BreakAll) { + allowBreak = true; + } + } + aBreakBefore[cur] = allowBreak; + if (allowBreak) + state.NotifyBreakBefore(); + lastClass = cl; + } +} |