diff options
Diffstat (limited to 'terminal/bidi.h')
| -rw-r--r-- | terminal/bidi.h | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/terminal/bidi.h b/terminal/bidi.h new file mode 100644 index 00000000..90d68e5b --- /dev/null +++ b/terminal/bidi.h @@ -0,0 +1,147 @@ +/* + * Header file shared between bidi.c and its tests. Not used by + * anything outside the bidi subsystem. + */ + +#ifndef PUTTY_BIDI_H +#define PUTTY_BIDI_H + +#define LMASK 0x3F /* Embedding Level mask */ +#define OMASK 0xC0 /* Override mask */ +#define OISL 0x80 /* Override is L */ +#define OISR 0x40 /* Override is R */ + +/* Shaping Helpers */ +#define STYPE(xh) ((((xh) >= SHAPE_FIRST) && ((xh) <= SHAPE_LAST)) ? \ +shapetypes[(xh)-SHAPE_FIRST].type : SU) /*))*/ +#define SISOLATED(xh) (shapetypes[(xh)-SHAPE_FIRST].form_b) +#define SFINAL(xh) ((xh)+1) +#define SINITIAL(xh) ((xh)+2) +#define SMEDIAL(ch) ((ch)+3) + +#define leastGreaterOdd(x) ( ((x)+1) | 1 ) +#define leastGreaterEven(x) ( ((x)+2) &~ 1 ) + +/* Function declarations used outside bidi.c */ +unsigned char bidi_getType(int ch); + +/* Bidi character types */ +#define BIDI_CHAR_TYPE_LIST(X) \ + X(L) \ + X(LRE) \ + X(LRO) \ + X(LRI) \ + X(R) \ + X(AL) \ + X(RLE) \ + X(RLO) \ + X(RLI) \ + X(PDF) \ + X(PDI) \ + X(FSI) \ + X(EN) \ + X(ES) \ + X(ET) \ + X(AN) \ + X(CS) \ + X(NSM) \ + X(BN) \ + X(B) \ + X(S) \ + X(WS) \ + X(ON) \ + /* end of list */ + +/* Shaping Types */ +#define SHAPING_CHAR_TYPE_LIST(X) \ + X(SL) /* Left-Joining, doesn't exist in U+0600 - U+06FF */ \ + X(SR) /* Right-Joining, ie has Isolated, Final */ \ + X(SD) /* Dual-Joining, ie has Isolated, Final, Initial, Medial */ \ + X(SU) /* Non-Joining */ \ + X(SC) /* Join-Causing, like U+0640 (TATWEEL) */ \ + /* end of list */ + +#define ENUM_DECL(name) name, +typedef enum { BIDI_CHAR_TYPE_LIST(ENUM_DECL) N_BIDI_TYPES } BidiType; +typedef enum { SHAPING_CHAR_TYPE_LIST(ENUM_DECL) N_SHAPING_TYPES } ShapingType; +#undef ENUM_DECL + +static inline bool typeIsStrong(BidiType t) +{ + return ((1<<L) | (1<<R) | (1<<AL)) & (1 << t); +} +static inline bool typeIsWeak(BidiType t) +{ + return ((1<<EN) | (1<<ES) | (1<<ET) | (1<<AN) | + (1<<CS) | (1<<NSM) | (1<<BN)) & (1 << t); +} +static inline bool typeIsNeutral(BidiType t) +{ + return ((1<<B) | (1<<S) | (1<<WS) | (1<<ON)) & (1 << t); +} +static inline bool typeIsBidiActive(BidiType t) +{ + return ((1<<R) | (1<<AL) | (1<<AN) | (1<<RLE) | (1<<LRE) | (1<<RLO) | + (1<<LRO) | (1<<PDF) | (1<<RLI)) & (1 << t); +} +static inline bool typeIsIsolateInitiator(BidiType t) +{ + return ((1<<LRI) | (1<<RLI) | (1<<FSI)) & (1 << t); +} +static inline bool typeIsIsolateInitiatorOrPDI(BidiType t) +{ + return ((1<<LRI) | (1<<RLI) | (1<<FSI) | (1<<PDI)) & (1 << t); +} +static inline bool typeIsEmbeddingInitiator(BidiType t) +{ + return ((1<<LRE) | (1<<RLE) | (1<<LRO) | (1<<RLO)) & (1 << t); +} +static inline bool typeIsEmbeddingInitiatorOrPDF(BidiType t) +{ + return ((1<<LRE) | (1<<RLE) | (1<<LRO) | (1<<RLO) | (1<<PDF)) & (1 << t); +} +static inline bool typeIsWeakSeparatorOrTerminator(BidiType t) +{ + return ((1<<ES) | (1<<ET) | (1<<CS)) & (1 << t); +} +static inline bool typeIsNeutralOrIsolate(BidiType t) +{ + return ((1<<S) | (1<<WS) | (1<<ON) | (1<<FSI) | (1<<LRI) | (1<<RLI) | + (1<<PDI)) & (1 << t); +} +static inline bool typeIsSegmentOrParaSeparator(BidiType t) +{ + return ((1<<S) | (1<<B)) & (1 << t); +} +static inline bool typeIsWhitespaceOrIsolate(BidiType t) +{ + return ((1<<WS) | (1<<FSI) | (1<<LRI) | (1<<RLI) | (1<<PDI)) & (1 << t); +} +static inline bool typeIsRemovedDuringProcessing(BidiType t) +{ + return ((1<<RLE) | (1<<LRE) | (1<<RLO) | (1<<LRO) | (1<<PDF) | + (1<<BN)) & (1 << t); +} +static inline bool typeIsStrongOrNumber(BidiType t) +{ + return ((1<<L) | (1<<R) | (1<<AL) | (1<<EN) | (1<<AN)) & (1 << t); +} +static inline bool typeIsETOrBN(BidiType t) +{ + return ((1<<ET) | (1<<BN)) & (1 << t); +} + +/* + * More featureful interface to the bidi code, for use in bidi_test.c. + * It returns a potentially different value of textlen (in case we're + * compiling in REMOVE_FORMATTING_CHARACTERS mode), and also permits + * you to pass in an override to the paragraph direction (because many + * of the UCD conformance tests use one). + * + * 'override' is 0 for no override, +1 for left-to-right, -1 for + * right-to-left. + */ +size_t do_bidi_test(BidiContext *ctx, bidi_char *text, size_t textlen, + int override); + +#endif /* PUTTY_BIDI_H */ |