mirror of
https://git.notmuchmail.org/git/notmuch
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140 lines
3.7 KiB
C++
140 lines
3.7 KiB
C++
#include "database-private.h"
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#if HAVE_SFSEXP
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#include "sexp.h"
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/* _sexp is used for file scope symbols to avoid clashing with
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* definitions from sexp.h */
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typedef enum {
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SEXP_FLAG_NONE = 0,
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SEXP_FLAG_FIELD = 1 << 0,
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} _sexp_flag_t;
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typedef struct {
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const char *name;
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Xapian::Query::op xapian_op;
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Xapian::Query initial;
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_sexp_flag_t flags;
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} _sexp_prefix_t;
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static _sexp_prefix_t prefixes[] =
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{
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{ "and", Xapian::Query::OP_AND, Xapian::Query::MatchAll,
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SEXP_FLAG_NONE },
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{ "not", Xapian::Query::OP_AND_NOT, Xapian::Query::MatchAll,
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SEXP_FLAG_NONE },
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{ "or", Xapian::Query::OP_OR, Xapian::Query::MatchNothing,
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SEXP_FLAG_NONE },
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{ "subject", Xapian::Query::OP_AND, Xapian::Query::MatchAll,
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SEXP_FLAG_FIELD },
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{ }
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};
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static notmuch_status_t _sexp_to_xapian_query (notmuch_database_t *notmuch,
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const _sexp_prefix_t *parent,
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const sexp_t *sx,
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Xapian::Query &output);
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static notmuch_status_t
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_sexp_combine_query (notmuch_database_t *notmuch,
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const _sexp_prefix_t *parent,
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Xapian::Query::op operation,
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Xapian::Query left,
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const sexp_t *sx,
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Xapian::Query &output)
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{
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Xapian::Query subquery;
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notmuch_status_t status;
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/* if we run out elements, return accumulator */
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if (! sx) {
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output = left;
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return NOTMUCH_STATUS_SUCCESS;
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}
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status = _sexp_to_xapian_query (notmuch, parent, sx, subquery);
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if (status)
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return status;
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return _sexp_combine_query (notmuch,
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parent,
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operation,
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Xapian::Query (operation, left, subquery),
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sx->next, output);
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}
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/* Here we expect the s-expression to be a proper list, with first
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* element defining and operation, or as a special case the empty
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* list */
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static notmuch_status_t
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_sexp_to_xapian_query (notmuch_database_t *notmuch, const _sexp_prefix_t *parent, const sexp_t *sx,
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Xapian::Query &output)
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{
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if (sx->ty == SEXP_VALUE) {
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std::string term = Xapian::Unicode::tolower (sx->val);
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Xapian::Stem stem = *(notmuch->stemmer);
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std::string term_prefix = parent ? _find_prefix (parent->name) : "";
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if (sx->aty == SEXP_BASIC)
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term = "Z" + term_prefix + stem (term);
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else
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term = term_prefix + term;
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output = Xapian::Query (term);
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return NOTMUCH_STATUS_SUCCESS;
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}
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/* Empty list */
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if (! sx->list) {
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output = Xapian::Query::MatchAll;
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return NOTMUCH_STATUS_SUCCESS;
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}
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if (sx->list->ty == SEXP_LIST) {
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_notmuch_database_log (notmuch, "unexpected list in field/operation position\n",
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sx->list->val);
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return NOTMUCH_STATUS_BAD_QUERY_SYNTAX;
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}
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for (_sexp_prefix_t *prefix = prefixes; prefix && prefix->name; prefix++) {
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if (strcmp (prefix->name, sx->list->val) == 0) {
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if (prefix->flags & SEXP_FLAG_FIELD) {
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if (parent) {
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_notmuch_database_log (notmuch, "nested field: '%s' inside '%s'\n",
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prefix->name, parent->name);
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return NOTMUCH_STATUS_BAD_QUERY_SYNTAX;
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}
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parent = prefix;
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}
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return _sexp_combine_query (notmuch, parent, prefix->xapian_op, prefix->initial,
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sx->list->next, output);
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}
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}
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_notmuch_database_log (notmuch, "unknown prefix '%s'\n", sx->list->val);
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return NOTMUCH_STATUS_BAD_QUERY_SYNTAX;
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}
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notmuch_status_t
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_notmuch_sexp_string_to_xapian_query (notmuch_database_t *notmuch, const char *querystr,
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Xapian::Query &output)
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{
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const sexp_t *sx = NULL;
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char *buf = talloc_strdup (notmuch, querystr);
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sx = parse_sexp (buf, strlen (querystr));
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if (! sx) {
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_notmuch_database_log (notmuch, "invalid s-expression: '%s'\n", querystr);
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return NOTMUCH_STATUS_BAD_QUERY_SYNTAX;
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}
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return _sexp_to_xapian_query (notmuch, NULL, sx, output);
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}
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#endif
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