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spell.c
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spell.c
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/* vi:set ts=8 sts=4 sw=4:
*
* VIM - Vi IMproved by Bram Moolenaar
*
* Do ":help uganda" in Vim to read copying and usage conditions.
* Do ":help credits" in Vim to see a list of people who contributed.
* See README.txt for an overview of the Vim source code.
*/
/*
* spell.c: code for spell checking
*
* The spell checking mechanism uses a tree (aka trie). Each node in the tree
* has a list of bytes that can appear (siblings). For each byte there is a
* pointer to the node with the byte that follows in the word (child).
*
* A NUL byte is used where the word may end. The bytes are sorted, so that
* binary searching can be used and the NUL bytes are at the start. The
* number of possible bytes is stored before the list of bytes.
*
* The tree uses two arrays: "byts" stores the characters, "idxs" stores
* either the next index or flags. The tree starts at index 0. For example,
* to lookup "vi" this sequence is followed:
* i = 0
* len = byts[i]
* n = where "v" appears in byts[i + 1] to byts[i + len]
* i = idxs[n]
* len = byts[i]
* n = where "i" appears in byts[i + 1] to byts[i + len]
* i = idxs[n]
* len = byts[i]
* find that byts[i + 1] is 0, idxs[i + 1] has flags for "vi".
*
* There are two word trees: one with case-folded words and one with words in
* original case. The second one is only used for keep-case words and is
* usually small.
*
* There is one additional tree for when not all prefixes are applied when
* generating the .spl file. This tree stores all the possible prefixes, as
* if they were words. At each word (prefix) end the prefix nr is stored, the
* following word must support this prefix nr. And the condition nr is
* stored, used to lookup the condition that the word must match with.
*
* Thanks to Olaf Seibert for providing an example implementation of this tree
* and the compression mechanism.
* LZ trie ideas:
* http://www.irb.hr/hr/home/ristov/papers/RistovLZtrieRevision1.pdf
* More papers: http://www-igm.univ-mlv.fr/~laporte/publi_en.html
*
* Matching involves checking the caps type: Onecap ALLCAP KeepCap.
*
* Why doesn't Vim use aspell/ispell/myspell/etc.?
* See ":help develop-spell".
*/
/* Use SPELL_PRINTTREE for debugging: dump the word tree after adding a word.
* Only use it for small word lists! */
#if 0
# define SPELL_PRINTTREE
#endif
/* Use DEBUG_TRIEWALK to print the changes made in suggest_trie_walk() for a
* specific word. */
#if 0
# define DEBUG_TRIEWALK
#endif
/*
* Use this to adjust the score after finding suggestions, based on the
* suggested word sounding like the bad word. This is much faster than doing
* it for every possible suggestion.
* Disadvantage: When "the" is typed as "hte" it sounds quite different ("@"
* vs "ht") and goes down in the list.
* Used when 'spellsuggest' is set to "best".
*/
#define RESCORE(word_score, sound_score) ((3 * word_score + sound_score) / 4)
/*
* Do the opposite: based on a maximum end score and a known sound score,
* compute the maximum word score that can be used.
*/
#define MAXSCORE(word_score, sound_score) ((4 * word_score - sound_score) / 3)
/*
* Vim spell file format: <HEADER>
* <SECTIONS>
* <LWORDTREE>
* <KWORDTREE>
* <PREFIXTREE>
*
* <HEADER>: <fileID> <versionnr>
*
* <fileID> 8 bytes "VIMspell"
* <versionnr> 1 byte VIMSPELLVERSION
*
*
* Sections make it possible to add information to the .spl file without
* making it incompatible with previous versions. There are two kinds of
* sections:
* 1. Not essential for correct spell checking. E.g. for making suggestions.
* These are skipped when not supported.
* 2. Optional information, but essential for spell checking when present.
* E.g. conditions for affixes. When this section is present but not
* supported an error message is given.
*
* <SECTIONS>: <section> ... <sectionend>
*
* <section>: <sectionID> <sectionflags> <sectionlen> (section contents)
*
* <sectionID> 1 byte number from 0 to 254 identifying the section
*
* <sectionflags> 1 byte SNF_REQUIRED: this section is required for correct
* spell checking
*
* <sectionlen> 4 bytes length of section contents, MSB first
*
* <sectionend> 1 byte SN_END
*
*
* sectionID == SN_INFO: <infotext>
* <infotext> N bytes free format text with spell file info (version,
* website, etc)
*
* sectionID == SN_REGION: <regionname> ...
* <regionname> 2 bytes Up to 8 region names: ca, au, etc. Lower case.
* First <regionname> is region 1.
*
* sectionID == SN_CHARFLAGS: <charflagslen> <charflags>
* <folcharslen> <folchars>
* <charflagslen> 1 byte Number of bytes in <charflags> (should be 128).
* <charflags> N bytes List of flags (first one is for character 128):
* 0x01 word character CF_WORD
* 0x02 upper-case character CF_UPPER
* <folcharslen> 2 bytes Number of bytes in <folchars>.
* <folchars> N bytes Folded characters, first one is for character 128.
*
* sectionID == SN_MIDWORD: <midword>
* <midword> N bytes Characters that are word characters only when used
* in the middle of a word.
*
* sectionID == SN_PREFCOND: <prefcondcnt> <prefcond> ...
* <prefcondcnt> 2 bytes Number of <prefcond> items following.
* <prefcond> : <condlen> <condstr>
* <condlen> 1 byte Length of <condstr>.
* <condstr> N bytes Condition for the prefix.
*
* sectionID == SN_REP: <repcount> <rep> ...
* <repcount> 2 bytes number of <rep> items, MSB first.
* <rep> : <repfromlen> <repfrom> <reptolen> <repto>
* <repfromlen> 1 byte length of <repfrom>
* <repfrom> N bytes "from" part of replacement
* <reptolen> 1 byte length of <repto>
* <repto> N bytes "to" part of replacement
*
* sectionID == SN_REPSAL: <repcount> <rep> ...
* just like SN_REP but for soundfolded words
*
* sectionID == SN_SAL: <salflags> <salcount> <sal> ...
* <salflags> 1 byte flags for soundsalike conversion:
* SAL_F0LLOWUP
* SAL_COLLAPSE
* SAL_REM_ACCENTS
* <salcount> 2 bytes number of <sal> items following
* <sal> : <salfromlen> <salfrom> <saltolen> <salto>
* <salfromlen> 1 byte length of <salfrom>
* <salfrom> N bytes "from" part of soundsalike
* <saltolen> 1 byte length of <salto>
* <salto> N bytes "to" part of soundsalike
*
* sectionID == SN_SOFO: <sofofromlen> <sofofrom> <sofotolen> <sofoto>
* <sofofromlen> 2 bytes length of <sofofrom>
* <sofofrom> N bytes "from" part of soundfold
* <sofotolen> 2 bytes length of <sofoto>
* <sofoto> N bytes "to" part of soundfold
*
* sectionID == SN_SUGFILE: <timestamp>
* <timestamp> 8 bytes time in seconds that must match with .sug file
*
* sectionID == SN_NOSPLITSUGS: nothing
*
* sectionID == SN_WORDS: <word> ...
* <word> N bytes NUL terminated common word
*
* sectionID == SN_MAP: <mapstr>
* <mapstr> N bytes String with sequences of similar characters,
* separated by slashes.
*
* sectionID == SN_COMPOUND: <compmax> <compminlen> <compsylmax> <compoptions>
* <comppatcount> <comppattern> ... <compflags>
* <compmax> 1 byte Maximum nr of words in compound word.
* <compminlen> 1 byte Minimal word length for compounding.
* <compsylmax> 1 byte Maximum nr of syllables in compound word.
* <compoptions> 2 bytes COMP_ flags.
* <comppatcount> 2 bytes number of <comppattern> following
* <compflags> N bytes Flags from COMPOUNDRULE items, separated by
* slashes.
*
* <comppattern>: <comppatlen> <comppattext>
* <comppatlen> 1 byte length of <comppattext>
* <comppattext> N bytes end or begin chars from CHECKCOMPOUNDPATTERN
*
* sectionID == SN_NOBREAK: (empty, its presence is what matters)
*
* sectionID == SN_SYLLABLE: <syllable>
* <syllable> N bytes String from SYLLABLE item.
*
* <LWORDTREE>: <wordtree>
*
* <KWORDTREE>: <wordtree>
*
* <PREFIXTREE>: <wordtree>
*
*
* <wordtree>: <nodecount> <nodedata> ...
*
* <nodecount> 4 bytes Number of nodes following. MSB first.
*
* <nodedata>: <siblingcount> <sibling> ...
*
* <siblingcount> 1 byte Number of siblings in this node. The siblings
* follow in sorted order.
*
* <sibling>: <byte> [ <nodeidx> <xbyte>
* | <flags> [<flags2>] [<region>] [<affixID>]
* | [<pflags>] <affixID> <prefcondnr> ]
*
* <byte> 1 byte Byte value of the sibling. Special cases:
* BY_NOFLAGS: End of word without flags and for all
* regions.
* For PREFIXTREE <affixID> and
* <prefcondnr> follow.
* BY_FLAGS: End of word, <flags> follow.
* For PREFIXTREE <pflags>, <affixID>
* and <prefcondnr> follow.
* BY_FLAGS2: End of word, <flags> and <flags2>
* follow. Not used in PREFIXTREE.
* BY_INDEX: Child of sibling is shared, <nodeidx>
* and <xbyte> follow.
*
* <nodeidx> 3 bytes Index of child for this sibling, MSB first.
*
* <xbyte> 1 byte byte value of the sibling.
*
* <flags> 1 byte bitmask of:
* WF_ALLCAP word must have only capitals
* WF_ONECAP first char of word must be capital
* WF_KEEPCAP keep-case word
* WF_FIXCAP keep-case word, all caps not allowed
* WF_RARE rare word
* WF_BANNED bad word
* WF_REGION <region> follows
* WF_AFX <affixID> follows
*
* <flags2> 1 byte Bitmask of:
* WF_HAS_AFF >> 8 word includes affix
* WF_NEEDCOMP >> 8 word only valid in compound
* WF_NOSUGGEST >> 8 word not used for suggestions
* WF_COMPROOT >> 8 word already a compound
* WF_NOCOMPBEF >> 8 no compounding before this word
* WF_NOCOMPAFT >> 8 no compounding after this word
*
* <pflags> 1 byte bitmask of:
* WFP_RARE rare prefix
* WFP_NC non-combining prefix
* WFP_UP letter after prefix made upper case
*
* <region> 1 byte Bitmask for regions in which word is valid. When
* omitted it's valid in all regions.
* Lowest bit is for region 1.
*
* <affixID> 1 byte ID of affix that can be used with this word. In
* PREFIXTREE used for the required prefix ID.
*
* <prefcondnr> 2 bytes Prefix condition number, index in <prefcond> list
* from HEADER.
*
* All text characters are in 'encoding', but stored as single bytes.
*/
/*
* Vim .sug file format: <SUGHEADER>
* <SUGWORDTREE>
* <SUGTABLE>
*
* <SUGHEADER>: <fileID> <versionnr> <timestamp>
*
* <fileID> 6 bytes "VIMsug"
* <versionnr> 1 byte VIMSUGVERSION
* <timestamp> 8 bytes timestamp that must match with .spl file
*
*
* <SUGWORDTREE>: <wordtree> (see above, no flags or region used)
*
*
* <SUGTABLE>: <sugwcount> <sugline> ...
*
* <sugwcount> 4 bytes number of <sugline> following
*
* <sugline>: <sugnr> ... NUL
*
* <sugnr>: X bytes word number that results in this soundfolded word,
* stored as an offset to the previous number in as
* few bytes as possible, see offset2bytes())
*/
#include "vim.h"
#if defined(FEAT_SPELL) || defined(PROTO)
#ifndef UNIX /* it's in os_unix.h for Unix */
# include <time.h> /* for time_t */
#endif
#define MAXWLEN 250 /* Assume max. word len is this many bytes.
Some places assume a word length fits in a
byte, thus it can't be above 255. */
/* Type used for indexes in the word tree need to be at least 4 bytes. If int
* is 8 bytes we could use something smaller, but what? */
#if SIZEOF_INT > 3
typedef int idx_T;
#else
typedef long idx_T;
#endif
#ifdef VMS
# define SPL_FNAME_TMPL "%s_%s.spl"
# define SPL_FNAME_ADD "_add."
# define SPL_FNAME_ASCII "_ascii."
#else
# define SPL_FNAME_TMPL "%s.%s.spl"
# define SPL_FNAME_ADD ".add."
# define SPL_FNAME_ASCII ".ascii."
#endif
/* Flags used for a word. Only the lowest byte can be used, the region byte
* comes above it. */
#define WF_REGION 0x01 /* region byte follows */
#define WF_ONECAP 0x02 /* word with one capital (or all capitals) */
#define WF_ALLCAP 0x04 /* word must be all capitals */
#define WF_RARE 0x08 /* rare word */
#define WF_BANNED 0x10 /* bad word */
#define WF_AFX 0x20 /* affix ID follows */
#define WF_FIXCAP 0x40 /* keep-case word, allcap not allowed */
#define WF_KEEPCAP 0x80 /* keep-case word */
/* for <flags2>, shifted up one byte to be used in wn_flags */
#define WF_HAS_AFF 0x0100 /* word includes affix */
#define WF_NEEDCOMP 0x0200 /* word only valid in compound */
#define WF_NOSUGGEST 0x0400 /* word not to be suggested */
#define WF_COMPROOT 0x0800 /* already compounded word, COMPOUNDROOT */
#define WF_NOCOMPBEF 0x1000 /* no compounding before this word */
#define WF_NOCOMPAFT 0x2000 /* no compounding after this word */
/* only used for su_badflags */
#define WF_MIXCAP 0x20 /* mix of upper and lower case: macaRONI */
#define WF_CAPMASK (WF_ONECAP | WF_ALLCAP | WF_KEEPCAP | WF_FIXCAP)
/* flags for <pflags> */
#define WFP_RARE 0x01 /* rare prefix */
#define WFP_NC 0x02 /* prefix is not combining */
#define WFP_UP 0x04 /* to-upper prefix */
#define WFP_COMPPERMIT 0x08 /* prefix with COMPOUNDPERMITFLAG */
#define WFP_COMPFORBID 0x10 /* prefix with COMPOUNDFORBIDFLAG */
/* Flags for postponed prefixes in "sl_pidxs". Must be above affixID (one
* byte) and prefcondnr (two bytes). */
#define WF_RAREPFX (WFP_RARE << 24) /* rare postponed prefix */
#define WF_PFX_NC (WFP_NC << 24) /* non-combining postponed prefix */
#define WF_PFX_UP (WFP_UP << 24) /* to-upper postponed prefix */
#define WF_PFX_COMPPERMIT (WFP_COMPPERMIT << 24) /* postponed prefix with
* COMPOUNDPERMITFLAG */
#define WF_PFX_COMPFORBID (WFP_COMPFORBID << 24) /* postponed prefix with
* COMPOUNDFORBIDFLAG */
/* flags for <compoptions> */
#define COMP_CHECKDUP 1 /* CHECKCOMPOUNDDUP */
#define COMP_CHECKREP 2 /* CHECKCOMPOUNDREP */
#define COMP_CHECKCASE 4 /* CHECKCOMPOUNDCASE */
#define COMP_CHECKTRIPLE 8 /* CHECKCOMPOUNDTRIPLE */
/* Special byte values for <byte>. Some are only used in the tree for
* postponed prefixes, some only in the other trees. This is a bit messy... */
#define BY_NOFLAGS 0 /* end of word without flags or region; for
* postponed prefix: no <pflags> */
#define BY_INDEX 1 /* child is shared, index follows */
#define BY_FLAGS 2 /* end of word, <flags> byte follows; for
* postponed prefix: <pflags> follows */
#define BY_FLAGS2 3 /* end of word, <flags> and <flags2> bytes
* follow; never used in prefix tree */
#define BY_SPECIAL BY_FLAGS2 /* highest special byte value */
/* Info from "REP", "REPSAL" and "SAL" entries in ".aff" file used in si_rep,
* si_repsal, sl_rep, and si_sal. Not for sl_sal!
* One replacement: from "ft_from" to "ft_to". */
typedef struct fromto_S
{
char_u *ft_from;
char_u *ft_to;
} fromto_T;
/* Info from "SAL" entries in ".aff" file used in sl_sal.
* The info is split for quick processing by spell_soundfold().
* Note that "sm_oneof" and "sm_rules" point into sm_lead. */
typedef struct salitem_S
{
char_u *sm_lead; /* leading letters */
int sm_leadlen; /* length of "sm_lead" */
char_u *sm_oneof; /* letters from () or NULL */
char_u *sm_rules; /* rules like ^, $, priority */
char_u *sm_to; /* replacement. */
#ifdef FEAT_MBYTE
int *sm_lead_w; /* wide character copy of "sm_lead" */
int *sm_oneof_w; /* wide character copy of "sm_oneof" */
int *sm_to_w; /* wide character copy of "sm_to" */
#endif
} salitem_T;
#ifdef FEAT_MBYTE
typedef int salfirst_T;
#else
typedef short salfirst_T;
#endif
/* Values for SP_*ERROR are negative, positive values are used by
* read_cnt_string(). */
#define SP_TRUNCERROR -1 /* spell file truncated error */
#define SP_FORMERROR -2 /* format error in spell file */
#define SP_OTHERERROR -3 /* other error while reading spell file */
/*
* Structure used to store words and other info for one language, loaded from
* a .spl file.
* The main access is through the tree in "sl_fbyts/sl_fidxs", storing the
* case-folded words. "sl_kbyts/sl_kidxs" is for keep-case words.
*
* The "byts" array stores the possible bytes in each tree node, preceded by
* the number of possible bytes, sorted on byte value:
* <len> <byte1> <byte2> ...
* The "idxs" array stores the index of the child node corresponding to the
* byte in "byts".
* Exception: when the byte is zero, the word may end here and "idxs" holds
* the flags, region mask and affixID for the word. There may be several
* zeros in sequence for alternative flag/region/affixID combinations.
*/
typedef struct slang_S slang_T;
struct slang_S
{
slang_T *sl_next; /* next language */
char_u *sl_name; /* language name "en", "en.rare", "nl", etc. */
char_u *sl_fname; /* name of .spl file */
int sl_add; /* TRUE if it's a .add file. */
char_u *sl_fbyts; /* case-folded word bytes */
idx_T *sl_fidxs; /* case-folded word indexes */
char_u *sl_kbyts; /* keep-case word bytes */
idx_T *sl_kidxs; /* keep-case word indexes */
char_u *sl_pbyts; /* prefix tree word bytes */
idx_T *sl_pidxs; /* prefix tree word indexes */
char_u *sl_info; /* infotext string or NULL */
char_u sl_regions[17]; /* table with up to 8 region names plus NUL */
char_u *sl_midword; /* MIDWORD string or NULL */
hashtab_T sl_wordcount; /* hashtable with word count, wordcount_T */
int sl_compmax; /* COMPOUNDWORDMAX (default: MAXWLEN) */
int sl_compminlen; /* COMPOUNDMIN (default: 0) */
int sl_compsylmax; /* COMPOUNDSYLMAX (default: MAXWLEN) */
int sl_compoptions; /* COMP_* flags */
garray_T sl_comppat; /* CHECKCOMPOUNDPATTERN items */
regprog_T *sl_compprog; /* COMPOUNDRULE turned into a regexp progrm
* (NULL when no compounding) */
char_u *sl_comprules; /* all COMPOUNDRULE concatenated (or NULL) */
char_u *sl_compstartflags; /* flags for first compound word */
char_u *sl_compallflags; /* all flags for compound words */
char_u sl_nobreak; /* When TRUE: no spaces between words */
char_u *sl_syllable; /* SYLLABLE repeatable chars or NULL */
garray_T sl_syl_items; /* syllable items */
int sl_prefixcnt; /* number of items in "sl_prefprog" */
regprog_T **sl_prefprog; /* table with regprogs for prefixes */
garray_T sl_rep; /* list of fromto_T entries from REP lines */
short sl_rep_first[256]; /* indexes where byte first appears, -1 if
there is none */
garray_T sl_sal; /* list of salitem_T entries from SAL lines */
salfirst_T sl_sal_first[256]; /* indexes where byte first appears, -1 if
there is none */
int sl_followup; /* SAL followup */
int sl_collapse; /* SAL collapse_result */
int sl_rem_accents; /* SAL remove_accents */
int sl_sofo; /* SOFOFROM and SOFOTO instead of SAL items:
* "sl_sal_first" maps chars, when has_mbyte
* "sl_sal" is a list of wide char lists. */
garray_T sl_repsal; /* list of fromto_T entries from REPSAL lines */
short sl_repsal_first[256]; /* sl_rep_first for REPSAL lines */
int sl_nosplitsugs; /* don't suggest splitting a word */
/* Info from the .sug file. Loaded on demand. */
time_t sl_sugtime; /* timestamp for .sug file */
char_u *sl_sbyts; /* soundfolded word bytes */
idx_T *sl_sidxs; /* soundfolded word indexes */
buf_T *sl_sugbuf; /* buffer with word number table */
int sl_sugloaded; /* TRUE when .sug file was loaded or failed to
load */
int sl_has_map; /* TRUE if there is a MAP line */
#ifdef FEAT_MBYTE
hashtab_T sl_map_hash; /* MAP for multi-byte chars */
int sl_map_array[256]; /* MAP for first 256 chars */
#else
char_u sl_map_array[256]; /* MAP for first 256 chars */
#endif
hashtab_T sl_sounddone; /* table with soundfolded words that have
handled, see add_sound_suggest() */
};
/* First language that is loaded, start of the linked list of loaded
* languages. */
static slang_T *first_lang = NULL;
/* Flags used in .spl file for soundsalike flags. */
#define SAL_F0LLOWUP 1
#define SAL_COLLAPSE 2
#define SAL_REM_ACCENTS 4
/*
* Structure used in "b_langp", filled from 'spelllang'.
*/
typedef struct langp_S
{
slang_T *lp_slang; /* info for this language */
slang_T *lp_sallang; /* language used for sound folding or NULL */
slang_T *lp_replang; /* language used for REP items or NULL */
int lp_region; /* bitmask for region or REGION_ALL */
} langp_T;
#define LANGP_ENTRY(ga, i) (((langp_T *)(ga).ga_data) + (i))
#define REGION_ALL 0xff /* word valid in all regions */
#define VIMSPELLMAGIC "VIMspell" /* string at start of Vim spell file */
#define VIMSPELLMAGICL 8
#define VIMSPELLVERSION 50
#define VIMSUGMAGIC "VIMsug" /* string at start of Vim .sug file */
#define VIMSUGMAGICL 6
#define VIMSUGVERSION 1
/* Section IDs. Only renumber them when VIMSPELLVERSION changes! */
#define SN_REGION 0 /* <regionname> section */
#define SN_CHARFLAGS 1 /* charflags section */
#define SN_MIDWORD 2 /* <midword> section */
#define SN_PREFCOND 3 /* <prefcond> section */
#define SN_REP 4 /* REP items section */
#define SN_SAL 5 /* SAL items section */
#define SN_SOFO 6 /* soundfolding section */
#define SN_MAP 7 /* MAP items section */
#define SN_COMPOUND 8 /* compound words section */
#define SN_SYLLABLE 9 /* syllable section */
#define SN_NOBREAK 10 /* NOBREAK section */
#define SN_SUGFILE 11 /* timestamp for .sug file */
#define SN_REPSAL 12 /* REPSAL items section */
#define SN_WORDS 13 /* common words */
#define SN_NOSPLITSUGS 14 /* don't split word for suggestions */
#define SN_INFO 15 /* info section */
#define SN_END 255 /* end of sections */
#define SNF_REQUIRED 1 /* <sectionflags>: required section */
/* Result values. Lower number is accepted over higher one. */
#define SP_BANNED -1
#define SP_OK 0
#define SP_RARE 1
#define SP_LOCAL 2
#define SP_BAD 3
/* file used for "zG" and "zW" */
static char_u *int_wordlist = NULL;
typedef struct wordcount_S
{
short_u wc_count; /* nr of times word was seen */
char_u wc_word[1]; /* word, actually longer */
} wordcount_T;
static wordcount_T dumwc;
#define WC_KEY_OFF (unsigned)(dumwc.wc_word - (char_u *)&dumwc)
#define HI2WC(hi) ((wordcount_T *)((hi)->hi_key - WC_KEY_OFF))
#define MAXWORDCOUNT 0xffff
/*
* Information used when looking for suggestions.
*/
typedef struct suginfo_S
{
garray_T su_ga; /* suggestions, contains "suggest_T" */
int su_maxcount; /* max. number of suggestions displayed */
int su_maxscore; /* maximum score for adding to su_ga */
int su_sfmaxscore; /* idem, for when doing soundfold words */
garray_T su_sga; /* like su_ga, sound-folded scoring */
char_u *su_badptr; /* start of bad word in line */
int su_badlen; /* length of detected bad word in line */
int su_badflags; /* caps flags for bad word */
char_u su_badword[MAXWLEN]; /* bad word truncated at su_badlen */
char_u su_fbadword[MAXWLEN]; /* su_badword case-folded */
char_u su_sal_badword[MAXWLEN]; /* su_badword soundfolded */
hashtab_T su_banned; /* table with banned words */
slang_T *su_sallang; /* default language for sound folding */
} suginfo_T;
/* One word suggestion. Used in "si_ga". */
typedef struct suggest_S
{
char_u *st_word; /* suggested word, allocated string */
int st_wordlen; /* STRLEN(st_word) */
int st_orglen; /* length of replaced text */
int st_score; /* lower is better */
int st_altscore; /* used when st_score compares equal */
int st_salscore; /* st_score is for soundalike */
int st_had_bonus; /* bonus already included in score */
slang_T *st_slang; /* language used for sound folding */
} suggest_T;
#define SUG(ga, i) (((suggest_T *)(ga).ga_data)[i])
/* TRUE if a word appears in the list of banned words. */
#define WAS_BANNED(su, word) (!HASHITEM_EMPTY(hash_find(&su->su_banned, word)))
/* Number of suggestions kept when cleaning up. We need to keep more than
* what is displayed, because when rescore_suggestions() is called the score
* may change and wrong suggestions may be removed later. */
#define SUG_CLEAN_COUNT(su) ((su)->su_maxcount < 130 ? 150 : (su)->su_maxcount + 20)
/* Threshold for sorting and cleaning up suggestions. Don't want to keep lots
* of suggestions that are not going to be displayed. */
#define SUG_MAX_COUNT(su) (SUG_CLEAN_COUNT(su) + 50)
/* score for various changes */
#define SCORE_SPLIT 149 /* split bad word */
#define SCORE_SPLIT_NO 249 /* split bad word with NOSPLITSUGS */
#define SCORE_ICASE 52 /* slightly different case */
#define SCORE_REGION 200 /* word is for different region */
#define SCORE_RARE 180 /* rare word */
#define SCORE_SWAP 75 /* swap two characters */
#define SCORE_SWAP3 110 /* swap two characters in three */
#define SCORE_REP 65 /* REP replacement */
#define SCORE_SUBST 93 /* substitute a character */
#define SCORE_SIMILAR 33 /* substitute a similar character */
#define SCORE_SUBCOMP 33 /* substitute a composing character */
#define SCORE_DEL 94 /* delete a character */
#define SCORE_DELDUP 66 /* delete a duplicated character */
#define SCORE_DELCOMP 28 /* delete a composing character */
#define SCORE_INS 96 /* insert a character */
#define SCORE_INSDUP 67 /* insert a duplicate character */
#define SCORE_INSCOMP 30 /* insert a composing character */
#define SCORE_NONWORD 103 /* change non-word to word char */
#define SCORE_FILE 30 /* suggestion from a file */
#define SCORE_MAXINIT 350 /* Initial maximum score: higher == slower.
* 350 allows for about three changes. */
#define SCORE_COMMON1 30 /* subtracted for words seen before */
#define SCORE_COMMON2 40 /* subtracted for words often seen */
#define SCORE_COMMON3 50 /* subtracted for words very often seen */
#define SCORE_THRES2 10 /* word count threshold for COMMON2 */
#define SCORE_THRES3 100 /* word count threshold for COMMON3 */
/* When trying changed soundfold words it becomes slow when trying more than
* two changes. With less then two changes it's slightly faster but we miss a
* few good suggestions. In rare cases we need to try three of four changes.
*/
#define SCORE_SFMAX1 200 /* maximum score for first try */
#define SCORE_SFMAX2 300 /* maximum score for second try */
#define SCORE_SFMAX3 400 /* maximum score for third try */
#define SCORE_BIG SCORE_INS * 3 /* big difference */
#define SCORE_MAXMAX 999999 /* accept any score */
#define SCORE_LIMITMAX 350 /* for spell_edit_score_limit() */
/* for spell_edit_score_limit() we need to know the minimum value of
* SCORE_ICASE, SCORE_SWAP, SCORE_DEL, SCORE_SIMILAR and SCORE_INS */
#define SCORE_EDIT_MIN SCORE_SIMILAR
/*
* Structure to store info for word matching.
*/
typedef struct matchinf_S
{
langp_T *mi_lp; /* info for language and region */
/* pointers to original text to be checked */
char_u *mi_word; /* start of word being checked */
char_u *mi_end; /* end of matching word so far */
char_u *mi_fend; /* next char to be added to mi_fword */
char_u *mi_cend; /* char after what was used for
mi_capflags */
/* case-folded text */
char_u mi_fword[MAXWLEN + 1]; /* mi_word case-folded */
int mi_fwordlen; /* nr of valid bytes in mi_fword */
/* for when checking word after a prefix */
int mi_prefarridx; /* index in sl_pidxs with list of
affixID/condition */
int mi_prefcnt; /* number of entries at mi_prefarridx */
int mi_prefixlen; /* byte length of prefix */
#ifdef FEAT_MBYTE
int mi_cprefixlen; /* byte length of prefix in original
case */
#else
# define mi_cprefixlen mi_prefixlen /* it's the same value */
#endif
/* for when checking a compound word */
int mi_compoff; /* start of following word offset */
char_u mi_compflags[MAXWLEN]; /* flags for compound words used */
int mi_complen; /* nr of compound words used */
int mi_compextra; /* nr of COMPOUNDROOT words */
/* others */
int mi_result; /* result so far: SP_BAD, SP_OK, etc. */
int mi_capflags; /* WF_ONECAP WF_ALLCAP WF_KEEPCAP */
win_T *mi_win; /* buffer being checked */
/* for NOBREAK */
int mi_result2; /* "mi_resul" without following word */
char_u *mi_end2; /* "mi_end" without following word */
} matchinf_T;
/*
* The tables used for recognizing word characters according to spelling.
* These are only used for the first 256 characters of 'encoding'.
*/
typedef struct spelltab_S
{
char_u st_isw[256]; /* flags: is word char */
char_u st_isu[256]; /* flags: is uppercase char */
char_u st_fold[256]; /* chars: folded case */
char_u st_upper[256]; /* chars: upper case */
} spelltab_T;
static spelltab_T spelltab;
static int did_set_spelltab;
#define CF_WORD 0x01
#define CF_UPPER 0x02
static void clear_spell_chartab __ARGS((spelltab_T *sp));
static int set_spell_finish __ARGS((spelltab_T *new_st));
static int spell_iswordp __ARGS((char_u *p, win_T *wp));
static int spell_iswordp_nmw __ARGS((char_u *p));
#ifdef FEAT_MBYTE
static int spell_mb_isword_class __ARGS((int cl));
static int spell_iswordp_w __ARGS((int *p, win_T *wp));
#endif
static int write_spell_prefcond __ARGS((FILE *fd, garray_T *gap));
/*
* For finding suggestions: At each node in the tree these states are tried:
*/
typedef enum
{
STATE_START = 0, /* At start of node check for NUL bytes (goodword
* ends); if badword ends there is a match, otherwise
* try splitting word. */
STATE_NOPREFIX, /* try without prefix */
STATE_SPLITUNDO, /* Undo splitting. */
STATE_ENDNUL, /* Past NUL bytes at start of the node. */
STATE_PLAIN, /* Use each byte of the node. */
STATE_DEL, /* Delete a byte from the bad word. */
STATE_INS_PREP, /* Prepare for inserting bytes. */
STATE_INS, /* Insert a byte in the bad word. */
STATE_SWAP, /* Swap two bytes. */
STATE_UNSWAP, /* Undo swap two characters. */
STATE_SWAP3, /* Swap two characters over three. */
STATE_UNSWAP3, /* Undo Swap two characters over three. */
STATE_UNROT3L, /* Undo rotate three characters left */
STATE_UNROT3R, /* Undo rotate three characters right */
STATE_REP_INI, /* Prepare for using REP items. */
STATE_REP, /* Use matching REP items from the .aff file. */
STATE_REP_UNDO, /* Undo a REP item replacement. */
STATE_FINAL /* End of this node. */
} state_T;
/*
* Struct to keep the state at each level in suggest_try_change().
*/
typedef struct trystate_S
{
state_T ts_state; /* state at this level, STATE_ */
int ts_score; /* score */
idx_T ts_arridx; /* index in tree array, start of node */
short ts_curi; /* index in list of child nodes */
char_u ts_fidx; /* index in fword[], case-folded bad word */
char_u ts_fidxtry; /* ts_fidx at which bytes may be changed */
char_u ts_twordlen; /* valid length of tword[] */
char_u ts_prefixdepth; /* stack depth for end of prefix or
* PFD_PREFIXTREE or PFD_NOPREFIX */
char_u ts_flags; /* TSF_ flags */
#ifdef FEAT_MBYTE
char_u ts_tcharlen; /* number of bytes in tword character */
char_u ts_tcharidx; /* current byte index in tword character */
char_u ts_isdiff; /* DIFF_ values */
char_u ts_fcharstart; /* index in fword where badword char started */
#endif
char_u ts_prewordlen; /* length of word in "preword[]" */
char_u ts_splitoff; /* index in "tword" after last split */
char_u ts_splitfidx; /* "ts_fidx" at word split */
char_u ts_complen; /* nr of compound words used */
char_u ts_compsplit; /* index for "compflags" where word was spit */
char_u ts_save_badflags; /* su_badflags saved here */
char_u ts_delidx; /* index in fword for char that was deleted,
valid when "ts_flags" has TSF_DIDDEL */
} trystate_T;
/* values for ts_isdiff */
#define DIFF_NONE 0 /* no different byte (yet) */
#define DIFF_YES 1 /* different byte found */
#define DIFF_INSERT 2 /* inserting character */
/* values for ts_flags */
#define TSF_PREFIXOK 1 /* already checked that prefix is OK */
#define TSF_DIDSPLIT 2 /* tried split at this point */
#define TSF_DIDDEL 4 /* did a delete, "ts_delidx" has index */
/* special values ts_prefixdepth */
#define PFD_NOPREFIX 0xff /* not using prefixes */
#define PFD_PREFIXTREE 0xfe /* walking through the prefix tree */
#define PFD_NOTSPECIAL 0xfd /* highest value that's not special */
/* mode values for find_word */
#define FIND_FOLDWORD 0 /* find word case-folded */
#define FIND_KEEPWORD 1 /* find keep-case word */
#define FIND_PREFIX 2 /* find word after prefix */
#define FIND_COMPOUND 3 /* find case-folded compound word */
#define FIND_KEEPCOMPOUND 4 /* find keep-case compound word */
static slang_T *slang_alloc __ARGS((char_u *lang));
static void slang_free __ARGS((slang_T *lp));
static void slang_clear __ARGS((slang_T *lp));
static void slang_clear_sug __ARGS((slang_T *lp));
static void find_word __ARGS((matchinf_T *mip, int mode));
static int match_checkcompoundpattern __ARGS((char_u *ptr, int wlen, garray_T *gap));
static int can_compound __ARGS((slang_T *slang, char_u *word, char_u *flags));
static int can_be_compound __ARGS((trystate_T *sp, slang_T *slang, char_u *compflags, int flag));
static int match_compoundrule __ARGS((slang_T *slang, char_u *compflags));
static int valid_word_prefix __ARGS((int totprefcnt, int arridx, int flags, char_u *word, slang_T *slang, int cond_req));
static void find_prefix __ARGS((matchinf_T *mip, int mode));
static int fold_more __ARGS((matchinf_T *mip));
static int spell_valid_case __ARGS((int wordflags, int treeflags));
static int no_spell_checking __ARGS((win_T *wp));
static void spell_load_lang __ARGS((char_u *lang));
static char_u *spell_enc __ARGS((void));
static void int_wordlist_spl __ARGS((char_u *fname));
static void spell_load_cb __ARGS((char_u *fname, void *cookie));
static slang_T *spell_load_file __ARGS((char_u *fname, char_u *lang, slang_T *old_lp, int silent));
static char_u *read_cnt_string __ARGS((FILE *fd, int cnt_bytes, int *lenp));
static int read_region_section __ARGS((FILE *fd, slang_T *slang, int len));
static int read_charflags_section __ARGS((FILE *fd));
static int read_prefcond_section __ARGS((FILE *fd, slang_T *lp));
static int read_rep_section __ARGS((FILE *fd, garray_T *gap, short *first));
static int read_sal_section __ARGS((FILE *fd, slang_T *slang));
static int read_words_section __ARGS((FILE *fd, slang_T *lp, int len));
static void count_common_word __ARGS((slang_T *lp, char_u *word, int len, int count));
static int score_wordcount_adj __ARGS((slang_T *slang, int score, char_u *word, int split));
static int read_sofo_section __ARGS((FILE *fd, slang_T *slang));
static int read_compound __ARGS((FILE *fd, slang_T *slang, int len));
static int byte_in_str __ARGS((char_u *str, int byte));
static int init_syl_tab __ARGS((slang_T *slang));
static int count_syllables __ARGS((slang_T *slang, char_u *word));
static int set_sofo __ARGS((slang_T *lp, char_u *from, char_u *to));
static void set_sal_first __ARGS((slang_T *lp));
#ifdef FEAT_MBYTE
static int *mb_str2wide __ARGS((char_u *s));
#endif
static int spell_read_tree __ARGS((FILE *fd, char_u **bytsp, idx_T **idxsp, int prefixtree, int prefixcnt));
static idx_T read_tree_node __ARGS((FILE *fd, char_u *byts, idx_T *idxs, int maxidx, idx_T startidx, int prefixtree, int maxprefcondnr));
static void clear_midword __ARGS((win_T *buf));
static void use_midword __ARGS((slang_T *lp, win_T *buf));
static int find_region __ARGS((char_u *rp, char_u *region));
static int captype __ARGS((char_u *word, char_u *end));
static int badword_captype __ARGS((char_u *word, char_u *end));
static void spell_reload_one __ARGS((char_u *fname, int added_word));
static void set_spell_charflags __ARGS((char_u *flags, int cnt, char_u *upp));
static int set_spell_chartab __ARGS((char_u *fol, char_u *low, char_u *upp));
static int spell_casefold __ARGS((char_u *p, int len, char_u *buf, int buflen));
static int check_need_cap __ARGS((linenr_T lnum, colnr_T col));
static void spell_find_suggest __ARGS((char_u *badptr, int badlen, suginfo_T *su, int maxcount, int banbadword, int need_cap, int interactive));
#ifdef FEAT_EVAL
static void spell_suggest_expr __ARGS((suginfo_T *su, char_u *expr));
#endif
static void spell_suggest_file __ARGS((suginfo_T *su, char_u *fname));
static void spell_suggest_intern __ARGS((suginfo_T *su, int interactive));
static void suggest_load_files __ARGS((void));
static void tree_count_words __ARGS((char_u *byts, idx_T *idxs));
static void spell_find_cleanup __ARGS((suginfo_T *su));
static void onecap_copy __ARGS((char_u *word, char_u *wcopy, int upper));
static void allcap_copy __ARGS((char_u *word, char_u *wcopy));
static void suggest_try_special __ARGS((suginfo_T *su));
static void suggest_try_change __ARGS((suginfo_T *su));
static void suggest_trie_walk __ARGS((suginfo_T *su, langp_T *lp, char_u *fword, int soundfold));
static void go_deeper __ARGS((trystate_T *stack, int depth, int score_add));
#ifdef FEAT_MBYTE
static int nofold_len __ARGS((char_u *fword, int flen, char_u *word));
#endif
static void find_keepcap_word __ARGS((slang_T *slang, char_u *fword, char_u *kword));
static void score_comp_sal __ARGS((suginfo_T *su));
static void score_combine __ARGS((suginfo_T *su));
static int stp_sal_score __ARGS((suggest_T *stp, suginfo_T *su, slang_T *slang, char_u *badsound));
static void suggest_try_soundalike_prep __ARGS((void));
static void suggest_try_soundalike __ARGS((suginfo_T *su));
static void suggest_try_soundalike_finish __ARGS((void));
static void add_sound_suggest __ARGS((suginfo_T *su, char_u *goodword, int score, langp_T *lp));
static int soundfold_find __ARGS((slang_T *slang, char_u *word));
static void make_case_word __ARGS((char_u *fword, char_u *cword, int flags));
static void set_map_str __ARGS((slang_T *lp, char_u *map));
static int similar_chars __ARGS((slang_T *slang, int c1, int c2));
static void add_suggestion __ARGS((suginfo_T *su, garray_T *gap, char_u *goodword, int badlen, int score, int altscore, int had_bonus, slang_T *slang, int maxsf));
static void check_suggestions __ARGS((suginfo_T *su, garray_T *gap));
static void add_banned __ARGS((suginfo_T *su, char_u *word));
static void rescore_suggestions __ARGS((suginfo_T *su));
static void rescore_one __ARGS((suginfo_T *su, suggest_T *stp));
static int cleanup_suggestions __ARGS((garray_T *gap, int maxscore, int keep));
static void spell_soundfold __ARGS((slang_T *slang, char_u *inword, int folded, char_u *res));
static void spell_soundfold_sofo __ARGS((slang_T *slang, char_u *inword, char_u *res));
static void spell_soundfold_sal __ARGS((slang_T *slang, char_u *inword, char_u *res));
#ifdef FEAT_MBYTE
static void spell_soundfold_wsal __ARGS((slang_T *slang, char_u *inword, char_u *res));
#endif
static int soundalike_score __ARGS((char_u *goodsound, char_u *badsound));
static int spell_edit_score __ARGS((slang_T *slang, char_u *badword, char_u *goodword));
static int spell_edit_score_limit __ARGS((slang_T *slang, char_u *badword, char_u *goodword, int limit));
#ifdef FEAT_MBYTE
static int spell_edit_score_limit_w __ARGS((slang_T *slang, char_u *badword, char_u *goodword, int limit));
#endif
static void dump_word __ARGS((slang_T *slang, char_u *word, char_u *pat, int *dir, int round, int flags, linenr_T lnum));
static linenr_T dump_prefixes __ARGS((slang_T *slang, char_u *word, char_u *pat, int *dir, int round, int flags, linenr_T startlnum));
static buf_T *open_spellbuf __ARGS((void));
static void close_spellbuf __ARGS((buf_T *buf));
/*
* Use our own character-case definitions, because the current locale may
* differ from what the .spl file uses.
* These must not be called with negative number!
*/
#ifndef FEAT_MBYTE
/* Non-multi-byte implementation. */
# define SPELL_TOFOLD(c) ((c) < 256 ? (int)spelltab.st_fold[c] : (c))
# define SPELL_TOUPPER(c) ((c) < 256 ? (int)spelltab.st_upper[c] : (c))
# define SPELL_ISUPPER(c) ((c) < 256 ? spelltab.st_isu[c] : FALSE)
#else
# if defined(HAVE_WCHAR_H)
# include <wchar.h> /* for towupper() and towlower() */
# endif
/* Multi-byte implementation. For Unicode we can call utf_*(), but don't do
* that for ASCII, because we don't want to use 'casemap' here. Otherwise use
* the "w" library function for characters above 255 if available. */
# ifdef HAVE_TOWLOWER
# define SPELL_TOFOLD(c) (enc_utf8 && (c) >= 128 ? utf_fold(c) \
: (c) < 256 ? (int)spelltab.st_fold[c] : (int)towlower(c))
# else
# define SPELL_TOFOLD(c) (enc_utf8 && (c) >= 128 ? utf_fold(c) \
: (c) < 256 ? (int)spelltab.st_fold[c] : (c))
# endif
# ifdef HAVE_TOWUPPER
# define SPELL_TOUPPER(c) (enc_utf8 && (c) >= 128 ? utf_toupper(c) \
: (c) < 256 ? (int)spelltab.st_upper[c] : (int)towupper(c))
# else
# define SPELL_TOUPPER(c) (enc_utf8 && (c) >= 128 ? utf_toupper(c) \
: (c) < 256 ? (int)spelltab.st_upper[c] : (c))
# endif
# ifdef HAVE_ISWUPPER
# define SPELL_ISUPPER(c) (enc_utf8 && (c) >= 128 ? utf_isupper(c) \
: (c) < 256 ? spelltab.st_isu[c] : iswupper(c))
# else
# define SPELL_ISUPPER(c) (enc_utf8 && (c) >= 128 ? utf_isupper(c) \
: (c) < 256 ? spelltab.st_isu[c] : (FALSE))
# endif
#endif
static char *e_format = N_("E759: Format error in spell file");
static char *e_spell_trunc = N_("E758: Truncated spell file");
static char *e_afftrailing = N_("Trailing text in %s line %d: %s");
static char *e_affname = N_("Affix name too long in %s line %d: %s");
static char *e_affform = N_("E761: Format error in affix file FOL, LOW or UPP");
static char *e_affrange = N_("E762: Character in FOL, LOW or UPP is out of range");
static char *msg_compressing = N_("Compressing word tree...");
/* Remember what "z?" replaced. */
static char_u *repl_from = NULL;
static char_u *repl_to = NULL;