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| | #include <xapian.h>
#include "notmuch-private.h"
#include "sexp.h"
typedef struct {
const char *name;
Xapian::Query::op xapian_op;
Xapian::Query initial;
} _sexp_op_t;
static _sexp_op_t operations[] =
{
{ "and", Xapian::Query::OP_AND, Xapian::Query::MatchAll },
{ "not", Xapian::Query::OP_AND_NOT, Xapian::Query::MatchAll },
{ "or", Xapian::Query::OP_OR, Xapian::Query::MatchNothing },
{ }
};
typedef struct {
const char *name;
Xapian::Query::op xapian_op;
} _sexp_field_t;
static _sexp_field_t fields[] =
{
{ "subject", Xapian::Query::OP_PHRASE },
{ }
};
static Xapian::Query _sexp_to_xapian_query (sexp_t *sx);
static Xapian::Query
_sexp_combine_query (Xapian::Query::op operation,
Xapian::Query left,
sexp_t *sx)
{
/* if we run out elements, return accumulator */
if (! sx)
return left;
return _sexp_combine_query (operation,
Xapian::Query (operation,
left,
_sexp_to_xapian_query (sx)),
sx->next);
}
Xapian::Query
_notmuch_sexp_string_to_xapian_query (notmuch_database_t *notmuch, const char *querystr)
{
sexp_t *sx = NULL;
char *buf = talloc_strdup (notmuch, querystr);
sx = parse_sexp (buf, strlen (querystr));
return _sexp_to_xapian_query (sx);
}
static Xapian::Query
_sexp_combine_field (const char *prefix,
Xapian::Query::op operation,
sexp_t *sx)
{
std::vector<std::string> terms;
for (sexp_t *cur = sx; cur; cur = cur->next) {
std::string pref_str = prefix;
std::string word = cur->val;
if (operation == Xapian::Query::OP_PHRASE)
word = Xapian::Unicode::tolower (word);
terms.push_back (pref_str + word);
}
return Xapian::Query (operation, terms.begin (), terms.end ());
}
/* Here we expect the s-expression to be a proper list, with first
* element defining and operation, or as a special case the empty
* list */
static Xapian::Query
_sexp_to_xapian_query (sexp_t *sx)
{
const _sexp_op_t *op;
/* Currently we don't understand atoms */
assert (sx->ty == SEXP_LIST);
/* Empty list */
if (! sx->list)
return Xapian::Query::MatchAll;
for (op = operations; op && op->name; op++) {
if (strcasecmp (op->name, hd_sexp (sx)->val) == 0)
return _sexp_combine_query (op->xapian_op, op->initial, sx->list->next);
}
for (const _sexp_field_t *field = fields; field && field->name; field++) {
if (strcasecmp (field->name, hd_sexp (sx)->val) == 0)
return _sexp_combine_field (_find_prefix (field->name), field->xapian_op, sx->list->next);
}
INTERNAL_ERROR ("unimplemented prefix %s\n", sx->list->val);
}
|