![[tokkee]](http://tokkee.org/images/avatar.png){kind=avatar}
diff --git a/src/frontend/grammar.y b/src/frontend/grammar.y
index 129b4613009c9d5fc12aa71d2a470c0b02feed31..92b55ebbd509eb9d62c975a3866c5aa67ce07534 100644 (file)
--- a/src/frontend/grammar.y
+++ b/src/frontend/grammar.y
#include "utils/error.h"
#include "utils/llist.h"
+#include <assert.h>
+
#include <stdio.h>
#include <string.h>
+/*
+ * private helper functions
+ */
+
+static sdb_store_matcher_t *
+name_matcher(const char *type_name, const char *cmp, sdb_store_expr_t *expr);
+
+static sdb_store_matcher_t *
+name_iter_matcher(int m_type, const char *type_name, const char *cmp,
+ sdb_store_expr_t *expr);
+
+/*
+ * public API
+ */
+
int
sdb_fe_yylex(YYSTYPE *yylval, YYLTYPE *yylloc, sdb_fe_yyscan_t yyscanner);
/* quick access to the parser mode */
#define parser_mode sdb_fe_yyget_extra(scanner)->mode
+#define MODE_TO_STRING(m) \
+ (((m) == SDB_PARSE_DEFAULT) ? "statement" \
+ : ((m) == SDB_PARSE_COND) ? "condition" \
+ : ((m) == SDB_PARSE_EXPR) ? "expression" \
+ : "UNKNOWN")
+
%}
%pure-parser
%token AND OR IS NOT MATCHING FILTER
%token CMP_EQUAL CMP_NEQUAL CMP_REGEX CMP_NREGEX
-%token CMP_LT CMP_LE CMP_GE CMP_GT
+%token CMP_LT CMP_LE CMP_GE CMP_GT ALL ANY IN
%token CONCAT
%token START END
%left CMP_EQUAL CMP_NEQUAL
%left CMP_LT CMP_LE CMP_GE CMP_GT
%nonassoc CMP_REGEX CMP_NREGEX
+%nonassoc IN
%left CONCAT
%nonassoc IS
%left '+' '-'
%left '*' '/' '%'
+%left '[' ']'
%left '(' ')'
%left '.'
%type <expr> expression
-%type <sstr> op
+%type <sstr> cmp
%type <data> data
interval interval_elem
%destructor { free($$); } <str>
%destructor { sdb_object_deref(SDB_OBJ($$)); } <node> <m> <expr>
+%destructor { sdb_data_free_datum(&$$); } <data>
%%
statements:
statements ';' statement
{
- /* only accept this in default parse mode */
+ /* only accepted in default parse mode */
if (parser_mode != SDB_PARSE_DEFAULT) {
- sdb_fe_yyerror(&yylloc, scanner,
+ char errmsg[1024];
+ snprintf(errmsg, sizeof(errmsg),
YY_("syntax error, unexpected statement, "
- "expecting condition"));
+ "expecting %s"), MODE_TO_STRING(parser_mode));
+ sdb_fe_yyerror(&yylloc, scanner, errmsg);
sdb_object_deref(SDB_OBJ($3));
YYABORT;
}
|
statement
{
- /* only accept this in default parse mode */
+ /* only accepted in default parse mode */
if (parser_mode != SDB_PARSE_DEFAULT) {
- sdb_fe_yyerror(&yylloc, scanner,
+ char errmsg[1024];
+ snprintf(errmsg, sizeof(errmsg),
YY_("syntax error, unexpected statement, "
- "expecting condition"));
+ "expecting %s"), MODE_TO_STRING(parser_mode));
+ sdb_fe_yyerror(&yylloc, scanner, errmsg);
sdb_object_deref(SDB_OBJ($1));
YYABORT;
}
|
condition
{
- /* only accept this in condition parse mode */
+ /* only accepted in condition parse mode */
if (! (parser_mode & SDB_PARSE_COND)) {
- sdb_fe_yyerror(&yylloc, scanner,
+ char errmsg[1024];
+ snprintf(errmsg, sizeof(errmsg),
YY_("syntax error, unexpected condition, "
- "expecting statement"));
+ "expecting %s"), MODE_TO_STRING(parser_mode));
+ sdb_fe_yyerror(&yylloc, scanner, errmsg);
sdb_object_deref(SDB_OBJ($1));
YYABORT;
}
sdb_object_deref(SDB_OBJ($1));
}
}
+ |
+ expression
+ {
+ /* only accepted in expression parse mode */
+ if (! (parser_mode & SDB_PARSE_EXPR)) {
+ char errmsg[1024];
+ snprintf(errmsg, sizeof(errmsg),
+ YY_("syntax error, unexpected expression, "
+ "expecting %s"), MODE_TO_STRING(parser_mode));
+ sdb_fe_yyerror(&yylloc, scanner, errmsg);
+ sdb_object_deref(SDB_OBJ($1));
+ YYABORT;
+ }
+
+ if ($1) {
+ sdb_conn_node_t *n;
+ n = SDB_CONN_NODE(sdb_object_create_dT(/* name = */ NULL,
+ conn_expr_t, conn_expr_destroy));
+ n->cmd = CONNECTION_EXPR;
+ CONN_EXPR(n)->expr = $1;
+
+ sdb_llist_append(pt, SDB_OBJ(n));
+ sdb_object_deref(SDB_OBJ(n));
+ }
+ }
;
statement:
$$ = SDB_CONN_NODE(sdb_object_create_dT(/* name = */ NULL,
conn_fetch_t, conn_fetch_destroy));
+ CONN_FETCH($$)->type = SDB_HOST;
CONN_FETCH($$)->name = $3;
CONN_FETCH($$)->filter = CONN_MATCHER($4);
$$->cmd = CONNECTION_FETCH;
LIST IDENTIFIER filter_clause
{
int type = sdb_store_parse_object_type_plural($2);
- if (type < 0) {
+ if ((type < 0) || (type == SDB_ATTRIBUTE)) {
char errmsg[strlen($2) + 32];
snprintf(errmsg, sizeof(errmsg),
YY_("unknown data-source %s"), $2);
$$ = SDB_CONN_NODE(sdb_object_create_dT(/* name = */ NULL,
conn_lookup_t, conn_lookup_destroy));
+ CONN_LOOKUP($$)->type = SDB_HOST;
CONN_LOOKUP($$)->matcher = CONN_MATCHER($3);
CONN_LOOKUP($$)->filter = CONN_MATCHER($4);
$$->cmd = CONNECTION_LOOKUP;
$$ = SDB_CONN_NODE(sdb_object_create_dT(/* name = */ NULL,
conn_matcher_t, conn_matcher_destroy));
- $$->cmd = CONNECTION_EXPR;
+ $$->cmd = CONNECTION_MATCHER;
CONN_MATCHER($$)->matcher = $1;
}
;
}
;
-/*
- * <object_type>.<object_attr> <op> <value>
- *
- * Parse matchers comparing object attributes with a value.
- */
compare_matcher:
- ':' IDENTIFIER op expression
+ expression cmp expression
{
- $$ = sdb_store_matcher_parse_field_cmp($2, $3, $4);
- free($2); $2 = NULL;
- sdb_object_deref(SDB_OBJ($4));
+ sdb_store_matcher_op_cb cb = sdb_store_parse_matcher_op($2);
+ assert(cb); /* else, the grammar accepts invalid 'cmp' */
+ $$ = cb($1, $3);
+ sdb_object_deref(SDB_OBJ($1));
+ sdb_object_deref(SDB_OBJ($3));
}
|
- IDENTIFIER op expression
+ IDENTIFIER cmp expression
{
- $$ = sdb_store_matcher_parse_cmp($1, NULL, $2, $3);
+ $$ = name_matcher($1, $2, $3);
free($1); $1 = NULL;
sdb_object_deref(SDB_OBJ($3));
}
|
- IDENTIFIER '.' IDENTIFIER op expression
+ ANY IDENTIFIER cmp expression
{
- $$ = sdb_store_matcher_parse_cmp($1, $3, $4, $5);
- free($1); $1 = NULL;
- free($3); $3 = NULL;
- sdb_object_deref(SDB_OBJ($5));
+ $$ = name_iter_matcher(MATCHER_ANY, $2, $3, $4);
+ free($2); $2 = NULL;
+ sdb_object_deref(SDB_OBJ($4));
}
|
- IDENTIFIER '.' IDENTIFIER IS NULL_T
+ ALL IDENTIFIER cmp expression
{
- $$ = sdb_store_matcher_parse_cmp($1, $3, "IS", NULL);
- free($1); $1 = NULL;
- free($3); $3 = NULL;
+ $$ = name_iter_matcher(MATCHER_ALL, $2, $3, $4);
+ free($2); $2 = NULL;
+ sdb_object_deref(SDB_OBJ($4));
}
|
- IDENTIFIER '.' IDENTIFIER IS NOT NULL_T
+ expression IS NULL_T
{
- sdb_store_matcher_t *m;
- m = sdb_store_matcher_parse_cmp($1, $3, "IS", NULL);
- free($1); $1 = NULL;
- free($3); $3 = NULL;
-
- /* sdb_store_inv_matcher return NULL if m==NULL */
- $$ = sdb_store_inv_matcher(m);
- sdb_object_deref(SDB_OBJ(m));
+ $$ = sdb_store_isnull_matcher($1);
+ sdb_object_deref(SDB_OBJ($1));
+ }
+ |
+ expression IS NOT NULL_T
+ {
+ $$ = sdb_store_isnnull_matcher($1);
+ sdb_object_deref(SDB_OBJ($1));
+ }
+ |
+ expression IN expression
+ {
+ $$ = sdb_store_in_matcher($1, $3);
+ sdb_object_deref(SDB_OBJ($1));
+ sdb_object_deref(SDB_OBJ($3));
}
;
sdb_object_deref(SDB_OBJ($3)); $3 = NULL;
}
|
- ':' IDENTIFIER
+ expression CONCAT expression
+ {
+ $$ = sdb_store_expr_create(SDB_DATA_CONCAT, $1, $3);
+ sdb_object_deref(SDB_OBJ($1)); $1 = NULL;
+ sdb_object_deref(SDB_OBJ($3)); $3 = NULL;
+ }
+ |
+ '.' IDENTIFIER
{
int field = sdb_store_parse_field_name($2);
free($2); $2 = NULL;
$$ = sdb_store_expr_fieldvalue(field);
}
|
+ IDENTIFIER '[' STRING ']'
+ {
+ if (strcasecmp($1, "attribute")) {
+ char errmsg[strlen($1) + strlen($3) + 32];
+ snprintf(errmsg, sizeof(errmsg),
+ YY_("unknown value %s[%s]"), $1, $3);
+ sdb_fe_yyerror(&yylloc, scanner, errmsg);
+ free($1); $1 = NULL;
+ free($3); $3 = NULL;
+ YYABORT;
+ }
+ $$ = sdb_store_expr_attrvalue($3);
+ free($1); $1 = NULL;
+ free($3); $3 = NULL;
+ }
+ |
data
{
$$ = sdb_store_expr_constvalue(&$1);
}
;
-op:
+cmp:
CMP_EQUAL { $$ = "="; }
|
CMP_NEQUAL { $$ = "!="; }
sdb_log(SDB_LOG_ERR, "frontend: parse error: %s", msg);
} /* sdb_fe_yyerror */
+static sdb_store_matcher_t *
+name_matcher(const char *type_name, const char *cmp, sdb_store_expr_t *expr)
+{
+ int type = sdb_store_parse_object_type(type_name);
+ sdb_store_matcher_op_cb cb = sdb_store_parse_matcher_op(cmp);
+ sdb_store_expr_t *e;
+ sdb_store_matcher_t *m;
+ assert(cb);
+
+ /* TODO: this only works as long as queries
+ * are limited to hosts */
+ if (type != SDB_HOST)
+ return NULL;
+
+ e = sdb_store_expr_fieldvalue(SDB_FIELD_NAME);
+ m = cb(e, expr);
+ sdb_object_deref(SDB_OBJ(e));
+ return m;
+} /* name_matcher */
+
+static sdb_store_matcher_t *
+name_iter_matcher(int m_type, const char *type_name, const char *cmp,
+ sdb_store_expr_t *expr)
+{
+ int type = sdb_store_parse_object_type(type_name);
+ sdb_store_matcher_op_cb cb = sdb_store_parse_matcher_op(cmp);
+ sdb_store_expr_t *e;
+ sdb_store_matcher_t *m, *tmp = NULL;
+ assert(cb);
+
+ /* TODO: this only works as long as queries
+ * are limited to hosts */
+ if (type == SDB_HOST) {
+ return NULL;
+ }
+
+ e = sdb_store_expr_fieldvalue(SDB_FIELD_NAME);
+ m = cb(e, expr);
+ if (m_type == MATCHER_ANY)
+ tmp = sdb_store_any_matcher(type, m);
+ else if (m_type == MATCHER_ALL)
+ tmp = sdb_store_all_matcher(type, m);
+ sdb_object_deref(SDB_OBJ(m));
+ sdb_object_deref(SDB_OBJ(e));
+ return tmp;
+} /* name_iter_matcher */
+
/* vim: set tw=78 sw=4 ts=4 noexpandtab : */