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Cosmetic improvements in ltree code.
Add more comments in ltree.h, and correct a misstatement or two. Use a symbol, rather than hardwired constants, for the maximum length of an ltree label. The max length is still hardwired in the associated error messages, but I want to clean that up as part of a separate patch to improve the error messages.
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@ -7,9 +7,19 @@
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#include "tsearch/ts_locale.h"
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#include "utils/memutils.h"
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/* ltree */
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/*
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* We want the maximum length of a label to be encoding-independent, so
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* set it somewhat arbitrarily at 255 characters (not bytes), while using
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* uint16 fields to hold the byte length.
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*/
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#define LTREE_LABEL_MAX_CHARS 255
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typedef struct
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{
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uint16 len;
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uint16 len; /* label string length in bytes */
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char name[FLEXIBLE_ARRAY_MEMBER];
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} ltree_level;
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@ -19,7 +29,8 @@ typedef struct
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typedef struct
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{
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int32 vl_len_; /* varlena header (do not touch directly!) */
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uint16 numlevel;
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uint16 numlevel; /* number of labels */
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/* Array of maxalign'd ltree_level structs follows: */
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char data[FLEXIBLE_ARRAY_MEMBER];
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} ltree;
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@ -30,25 +41,35 @@ typedef struct
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/* lquery */
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/* lquery_variant: one branch of some OR'ed alternatives */
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typedef struct
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{
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int32 val;
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uint16 len;
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int32 val; /* CRC of label string */
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uint16 len; /* label string length in bytes */
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uint8 flag; /* see LVAR_xxx flags below */
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char name[FLEXIBLE_ARRAY_MEMBER];
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} lquery_variant;
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/*
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* Note: these macros contain too many MAXALIGN calls and so will sometimes
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* overestimate the space needed for an lquery_variant. However, we can't
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* change it without breaking on-disk compatibility for lquery.
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*/
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#define LVAR_HDRSIZE MAXALIGN(offsetof(lquery_variant, name))
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#define LVAR_NEXT(x) ( (lquery_variant*)( ((char*)(x)) + MAXALIGN(((lquery_variant*)(x))->len) + LVAR_HDRSIZE ) )
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#define LVAR_ANYEND 0x01
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#define LVAR_INCASE 0x02
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#define LVAR_SUBLEXEME 0x04
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#define LVAR_ANYEND 0x01 /* '*' flag: prefix match */
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#define LVAR_INCASE 0x02 /* '@' flag: case-insensitive match */
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#define LVAR_SUBLEXEME 0x04 /* '%' flag: word-wise match */
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/*
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* In an lquery_level, "flag" contains the union of the variants' flags
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* along with possible LQL_xxx flags; so those bit sets can't overlap.
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*/
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typedef struct
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{
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uint16 totallen; /* total length of this level, in bytes */
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uint16 flag; /* see LQL_xxx flags below */
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uint16 flag; /* see LQL_xxx and LVAR_xxx flags */
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uint16 numvar; /* number of variants; 0 means '*' */
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uint16 low; /* minimum repeat count for '*' */
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uint16 high; /* maximum repeat count for '*' */
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@ -60,7 +81,7 @@ typedef struct
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#define LQL_NEXT(x) ( (lquery_level*)( ((char*)(x)) + MAXALIGN(((lquery_level*)(x))->totallen) ) )
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#define LQL_FIRST(x) ( (lquery_variant*)( ((char*)(x))+LQL_HDRSIZE ) )
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#define LQL_NOT 0x10
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#define LQL_NOT 0x10 /* level has '!' (NOT) prefix */
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#ifdef LOWER_NODE
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#define FLG_CANLOOKSIGN(x) ( ( (x) & ( LQL_NOT | LVAR_ANYEND | LVAR_SUBLEXEME ) ) == 0 )
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@ -73,7 +94,7 @@ typedef struct
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{
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int32 vl_len_; /* varlena header (do not touch directly!) */
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uint16 numlevel; /* number of lquery_levels */
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uint16 firstgood;
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uint16 firstgood; /* number of leading simple-match levels */
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uint16 flag; /* see LQUERY_xxx flags below */
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/* Array of maxalign'd lquery_level structs follows: */
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char data[FLEXIBLE_ARRAY_MEMBER];
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@ -85,7 +85,7 @@ ltree_in(PG_FUNCTION_ARGS)
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if (charlen == 1 && t_iseq(ptr, '.'))
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{
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lptr->len = ptr - lptr->start;
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if (lptr->wlen > 255)
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if (lptr->wlen > LTREE_LABEL_MAX_CHARS)
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ereport(ERROR,
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(errcode(ERRCODE_NAME_TOO_LONG),
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errmsg("name of level is too long"),
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@ -112,7 +112,7 @@ ltree_in(PG_FUNCTION_ARGS)
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if (state == LTPRS_WAITDELIM)
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{
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lptr->len = ptr - lptr->start;
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if (lptr->wlen > 255)
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if (lptr->wlen > LTREE_LABEL_MAX_CHARS)
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ereport(ERROR,
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(errcode(ERRCODE_NAME_TOO_LONG),
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errmsg("name of level is too long"),
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@ -302,7 +302,7 @@ lquery_in(PG_FUNCTION_ARGS)
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((lptr->flag & LVAR_SUBLEXEME) ? 1 : 0) -
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((lptr->flag & LVAR_INCASE) ? 1 : 0) -
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((lptr->flag & LVAR_ANYEND) ? 1 : 0);
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if (lptr->wlen > 255)
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if (lptr->wlen > LTREE_LABEL_MAX_CHARS)
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ereport(ERROR,
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(errcode(ERRCODE_NAME_TOO_LONG),
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errmsg("name of level is too long"),
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@ -318,7 +318,7 @@ lquery_in(PG_FUNCTION_ARGS)
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((lptr->flag & LVAR_SUBLEXEME) ? 1 : 0) -
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((lptr->flag & LVAR_INCASE) ? 1 : 0) -
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((lptr->flag & LVAR_ANYEND) ? 1 : 0);
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if (lptr->wlen > 255)
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if (lptr->wlen > LTREE_LABEL_MAX_CHARS)
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ereport(ERROR,
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(errcode(ERRCODE_NAME_TOO_LONG),
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errmsg("name of level is too long"),
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@ -453,7 +453,7 @@ lquery_in(PG_FUNCTION_ARGS)
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errmsg("lquery syntax error"),
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errdetail("Unexpected end of line.")));
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if (lptr->wlen > 255)
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if (lptr->wlen > LTREE_LABEL_MAX_CHARS)
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ereport(ERROR,
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(errcode(ERRCODE_NAME_TOO_LONG),
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errmsg("name of level is too long"),
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@ -522,12 +522,21 @@ lquery_in(PG_FUNCTION_ARGS)
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}
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pfree(GETVAR(curqlevel));
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if (cur->numvar > 1 || cur->flag != 0)
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{
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/* Not a simple match */
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wasbad = true;
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}
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else if (wasbad == false)
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{
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/* count leading simple matches */
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(result->firstgood)++;
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}
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}
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else
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{
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/* '*', so this isn't a simple match */
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wasbad = true;
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}
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curqlevel = NEXTLEV(curqlevel);
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cur = LQL_NEXT(cur);
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}
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