dict.c

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/*-------------------------------------------------------------------------
 *
 * dict.c
 *      Standard interface to dictionary
 *
 * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
 *
 *
 * IDENTIFICATION
 *    src/backend/tsearch/dict.c
 *
 *-------------------------------------------------------------------------
 */
#include "postgres.h"

#include "catalog/pg_type.h"
#include "tsearch/ts_cache.h"
#include "tsearch/ts_utils.h"
#include "utils/builtins.h"


/*
 * Lexize one word by dictionary, mostly debug function
 */
Datum
ts_lexize(PG_FUNCTION_ARGS)
{
    Oid         dictId = PG_GETARG_OID(0);
    text       *in = PG_GETARG_TEXT_P(1);
    ArrayType  *a;
    TSDictionaryCacheEntry *dict;
    TSLexeme   *res,
               *ptr;
    Datum      *da;
    DictSubState dstate = {false, false, NULL};

    dict = lookup_ts_dictionary_cache(dictId);

    res = (TSLexeme *) DatumGetPointer(FunctionCall4(&dict->lexize,
                                             PointerGetDatum(dict->dictData),
                                                PointerGetDatum(VARDATA(in)),
                                       Int32GetDatum(VARSIZE(in) - VARHDRSZ),
                                                  PointerGetDatum(&dstate)));

    if (dstate.getnext)
    {
        dstate.isend = true;
        ptr = (TSLexeme *) DatumGetPointer(FunctionCall4(&dict->lexize,
                                             PointerGetDatum(dict->dictData),
                                                PointerGetDatum(VARDATA(in)),
                                       Int32GetDatum(VARSIZE(in) - VARHDRSZ),
                                                  PointerGetDatum(&dstate)));
        if (ptr != NULL)
            res = ptr;
    }

    if (!res)
        PG_RETURN_NULL();

    ptr = res;
    while (ptr->lexeme)
        ptr++;
    da = (Datum *) palloc(sizeof(Datum) * (ptr - res));
    ptr = res;
    while (ptr->lexeme)
    {
        da[ptr - res] = CStringGetTextDatum(ptr->lexeme);
        ptr++;
    }

    a = construct_array(da,
                        ptr - res,
                        TEXTOID,
                        -1,
                        false,
                        'i');

    ptr = res;
    while (ptr->lexeme)
    {
        pfree(DatumGetPointer(da[ptr - res]));
        pfree(ptr->lexeme);
        ptr++;
    }
    pfree(res);
    pfree(da);

    PG_RETURN_POINTER(a);
}