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ex_gui_dropmenu_8c example ex_gui_frameless_drag_8c example ex_gui_global_scroll_8c example ex_gui_glyph_8c example ex_gui_grid_8c example ex_gui_hexview_8c example ex_gui_hover_8c example ex_gui_isometric_8c example ex_gui_kvtable_8c example ex_gui_label_fits_8c example ex_gui_label_lines_8c example ex_gui_layout_persist_8c example ex_gui_listbox_8c example ex_gui_md_8c example ex_gui_multiwin_8c example ex_gui_network_8c example ex_gui_particles_8c example ex_gui_placeholder_8c example ex_gui_popup_8c example ex_gui_progressbar_8c example ex_gui_reentrant_8c example ex_gui_round_8c example ex_gui_sectionlist_8c example ex_gui_slider_default_8c example ex_gui_slider_handle_8c example ex_gui_slider_step_8c example ex_gui_splitpane_8c example ex_gui_suggest_8c example ex_gui_syntaxview_8c example ex_gui_text_shorten_8c example ex_gui_textarea_selection_8c example ex_gui_tooltip_8c example ex_gui_tree_lazy_8c example ex_gui_tree_order_8c example ex_gui_tree_state_8c example ex_gui_window_rect_8c example ex_gui_zorder_8c example ex_hash_8c example ex_hex_8c example ex_html_8c example ex_http2_8c example ex_http2_server_8c example ex_http_cookie_8c example ex_http_form_8c example ex_http_mime_8c example ex_http_req_8c example ex_http_response_8c example ex_http_router_8c example ex_http_server_8c example ex_icc_8c example ex_iso_astar_8c example ex_json_8c example ex_kafka_8c example ex_linalg_8c example ex_list_8c example ex_log_8c example ex_markdown_8c example ex_module_8c example ex_monolith_8c example ex_network_8c example ex_network_8h example ex_network_accept_8c example ex_network_alpn_8c example ex_network_connect_abort_8c example ex_network_mock_8c example ex_network_proxy_8c example ex_network_reactor_8c example ex_network_sni_8c example ex_network_sse_8c example ex_network_ssl_8c example ex_network_ssl_hardened_8c example ex_network_ssl_hostname_8c example ex_network_ssl_nonblock_8c example ex_network_tls_defaults_8c example ex_network_ws_8c example ex_network_ws_limits_8c example ex_nstr_8c example ex_parallel_for_8c example ex_parallel_team_8c example ex_pcre_8c example ex_pretty_8c example ex_pth_8c example ex_query_8c example ex_random_8c example ex_sha256_8c example ex_signals_8c example ex_spawn_8c example ex_ssrf_8c example ex_stack_8c example ex_threads_8c example ex_tiff_8c example ex_time_formats_8c example ex_trajectory_8c example ex_trees_8c example ex_url_8c example ex_url_safe_8c example ex_wrap_8c example ex_x509_8c example ex_zip_8c example ex_zlib_8c example mainpage_8dox n__3d_8c n__3d_8h n__aabb_8c n__aabb_8h n__allegro5_8c n__allegro5_8h n__allegro__4_8c n__allegro__4_8h n__anim_8c n__anim_8h n__astar_8c n__astar_8h n__atlas_8c n__atlas_8h n__avro_8c n__avro_8h n__base64_8c n__base64_8h n__clipboard_8c n__clipboard_8h n__clock__sync_8c n__clock__sync_8h n__common_8c n__common_8h n__config__file_8c n__config__file_8h n__cookies_8c n__cookies_8h n__crypto_8c n__crypto_8h n__dead__reckoning_8c 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5 Module N_QUERY
gullradriel edited this page 2026-10-09 00:55:18 +02:00
Table of Contents

QUERY: a small boolean field-query language

A compact, field-agnostic query language for filtering records. More...

Types

Name
typedef const char ()(const char *field, void *user_data) N_QUERY_GET
Field-value getter: return the value of field for the record being evaluated (NUL-terminated, borrowed), or NULL when the field is unknown/empty.

Functions

Name
void n_query_free(N_QUERY ** query)
Free a compiled query and set the pointer to NULL.
int n_query_eval(const N_QUERY * query, N_QUERY_GET get, void * user_data)
Evaluate a compiled query against one record via get.
N_QUERY * n_query_compile_ex(const char * expr, const char *const * fields, size_t nfields, char * errbuf, size_t errlen)
Compile expr, rejecting any field not in fields.
N_QUERY * n_query_compile(const char * expr, char * errbuf, size_t errlen)
Compile an expression into a query.

Detailed Description

A compact, field-agnostic query language for filtering records.

The grammar is:

query := or or := and ( "OR" and )* and := not ( "AND" not )* not := "NOT" not | primary primary := "(" or ")" | comparison comparison := FIELD OP VALUE

FIELD is an identifier (letters, digits, '_' and '.', e.g. "host" or "req.path"). VALUE is a bareword (run of non-space, non-operator, non-paren characters) or a double-quoted string. The operators are:

= case-insensitive string equality != case-insensitive string inequality ~ case-insensitive substring contains !~ does not contain =~ regex match (PCRE via n_pcre) !~~ regex does not match

< >= <= numeric comparison (both sides parsed as numbers)

AND/OR/NOT are case-insensitive keywords. Evaluation pulls each field's value through a caller-supplied getter, so the language is independent of any record type: the caller maps field names to its own data.

Types Documentation

typedef N_QUERY_GET

typedef const char *(* N_QUERY_GET) (const char *field, void *user_data);

Field-value getter: return the value of field for the record being evaluated (NUL-terminated, borrowed), or NULL when the field is unknown/empty.

Functions Documentation

function n_query_free

void n_query_free(
    N_QUERY ** query
)

Free a compiled query and set the pointer to NULL.

function n_query_eval

int n_query_eval(
    const N_QUERY * query,
    N_QUERY_GET get,
    void * user_data
)

Evaluate a compiled query against one record via get.

Returns 1 on match, 0 otherwise. A NULL query matches everything (returns 1).

function n_query_compile_ex

N_QUERY * n_query_compile_ex(
    const char * expr,
    const char *const * fields,
    size_t nfields,
    char * errbuf,
    size_t errlen
)

Compile expr, rejecting any field not in fields.

Parameters:

  • expr The query text.
  • fields The known field names, or NULL to skip validation (which is what n_query_compile does, so existing callers are unchanged).
  • nfields Length of fields.
  • errbuf Receives the reason on failure.
  • errlen Size of errbuf.

Return: The compiled query, or NULL on a parse error or an unknown field.

n_query_compile cannot tell a misspelled field from an empty one: the getter returns NULL for both, which evaluates as the empty string, so field != value and field !~ value on a TYPO match every record and the operator is told nothing. Passing the vocabulary catches it at compile time, with the offending name in errbuf, which is the only point at which it can still be reported.

function n_query_compile

N_QUERY * n_query_compile(
    const char * expr,
    char * errbuf,
    size_t errlen
)

Compile an expression into a query.

On error returns NULL and, when errbuf is non-NULL, writes a short message into it. Free with n_query_free. An empty/whitespace expression compiles to a match-all query.

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