From d73d8b6484206730ab501c6f7fe62691fd2bf10b Mon Sep 17 00:00:00 2001
From: Karel Zak <kzak@redhat.com>
Date: Tue, 5 Sep 2023 10:54:53 +0200
Subject: [PATCH] libsmartcols: (filter) evaluate params

Signed-off-by: Karel Zak <kzak@redhat.com>
---
 libsmartcols/samples/filter.c      | 14 ++++++++++++--
 libsmartcols/src/filter-param.c    | 31 ++++++++++++++++++++++++++++++
 libsmartcols/src/filter.c          | 25 ++++++++++++++++++++++++
 libsmartcols/src/libsmartcols.h.in |  3 +++
 libsmartcols/src/libsmartcols.sym  |  1 +
 libsmartcols/src/smartcolsP.h      |  4 ++++
 6 files changed, 76 insertions(+), 2 deletions(-)

diff --git a/libsmartcols/samples/filter.c b/libsmartcols/samples/filter.c
index aaf7fb69ea..fe8121c8e1 100644
--- a/libsmartcols/samples/filter.c
+++ b/libsmartcols/samples/filter.c
@@ -155,8 +155,18 @@ int main(int argc, char *argv[])
 			goto done;
 	}
 
-	for (i = 0; i < 10; i++)
-		add_line(tb, i + 1);
+	for (i = 0; i < 10; i++) {
+		struct libscols_line *ln = add_line(tb, i + 1);
+		int rc, status = 0;
+
+		if (!fltr)
+			continue;
+		rc = scols_line_apply_filter(ln, fltr, &status);
+		if (rc)
+			goto done;
+		if (status == 0) /* false */
+			scols_table_remove_line(tb, ln);
+	}
 
 	scols_print_table(tb);
 done:
diff --git a/libsmartcols/src/filter-param.c b/libsmartcols/src/filter-param.c
index cec98691de..f67efa509a 100644
--- a/libsmartcols/src/filter-param.c
+++ b/libsmartcols/src/filter-param.c
@@ -81,6 +81,37 @@ void filter_dump_param(struct ul_jsonwrt *json, struct filter_param *n)
 	ul_jsonwrt_object_close(json);
 }
 
+int filter_eval_param(struct libscols_filter *fltr  __attribute__((__unused__)),
+		struct filter_param *n,
+		struct libscols_line *ln  __attribute__((__unused__)),
+		int *status)
+{
+	int rc = 0;
+
+	switch (n->type) {
+	case F_PARAM_NAME: /* TODO */
+		break;
+	case F_PARAM_STRING:
+		*status = n->val.str != NULL && *n->val.str != '\0';
+		break;
+	case F_PARAM_NUMBER:
+		*status = n->val.num != 0;
+		break;
+	case F_PARAM_FLOAT:
+		*status = n->val.fnum != 0.0;
+		break;
+	case F_PARAM_BOOLEAN:
+		*status = n->val.boolean != false;
+		break;
+	default:
+		rc = -EINVAL;
+		break;
+	}
+
+	DBG(FLTR, ul_debugobj(fltr, "eval param [rc=%d, status=%d]", rc, *status));
+	return rc;
+}
+
 int filter_next_param(struct libscols_filter *fltr,
 		      struct libscols_iter *itr, struct filter_param **prm)
 {
diff --git a/libsmartcols/src/filter.c b/libsmartcols/src/filter.c
index e960ba66d2..4a1e56b28a 100644
--- a/libsmartcols/src/filter.c
+++ b/libsmartcols/src/filter.c
@@ -188,3 +188,28 @@ int scols_filter_assign_column(struct libscols_filter *fltr,
 
 	return ct == 0 ? 1 : 0;
 }
+
+int filter_eval_node(struct libscols_filter *fltr, struct filter_node *n,
+			struct libscols_line *ln, int *status)
+{
+	switch (n->type) {
+	case F_NODE_PARAM:
+		return filter_eval_param(fltr, (struct filter_param *) n, ln, status);
+	/* TODO
+	case F_NODE_EXPR:
+		return filter_eval_expr(fltr, (struct filter_expr *) n, ln, status);
+	*/
+	default:
+		break;
+	}
+	return -EINVAL;
+}
+
+int scols_line_apply_filter(struct libscols_line *ln,
+			struct libscols_filter *fltr, int *status)
+{
+	if (!ln || !fltr || !fltr->root)
+		return -EINVAL;
+
+	return filter_eval_node(fltr, fltr->root, ln, status);
+}
diff --git a/libsmartcols/src/libsmartcols.h.in b/libsmartcols/src/libsmartcols.h.in
index bb23e1f08b..ae1f581450 100644
--- a/libsmartcols/src/libsmartcols.h.in
+++ b/libsmartcols/src/libsmartcols.h.in
@@ -374,6 +374,9 @@ extern void scols_unref_filter(struct libscols_filter *fltr);
 extern int scols_dump_filter(struct libscols_filter *fltr, FILE *out);
 extern const char *scols_filter_get_errmsg(struct libscols_filter *fltr);
 
+extern int scols_line_apply_filter(struct libscols_line *ln,
+			struct libscols_filter *fltr, int *status);
+
 extern int scols_filter_next_name(struct libscols_filter *fltr,
                         struct libscols_iter *itr, const char **name);
 extern int scols_filter_assign_column(struct libscols_filter *fltr,
diff --git a/libsmartcols/src/libsmartcols.sym b/libsmartcols/src/libsmartcols.sym
index b50c80d79b..5e0c560696 100644
--- a/libsmartcols/src/libsmartcols.sym
+++ b/libsmartcols/src/libsmartcols.sym
@@ -228,4 +228,5 @@ SMARTCOLS_2.40 {
 	scols_filter_get_errmsg;
 	scols_filter_next_name;
 	scols_filter_assign_column;
+	scols_line_apply_filter;
 } SMARTCOLS_2.39;
diff --git a/libsmartcols/src/smartcolsP.h b/libsmartcols/src/smartcolsP.h
index 0119cedfd5..0407b089a0 100644
--- a/libsmartcols/src/smartcolsP.h
+++ b/libsmartcols/src/smartcolsP.h
@@ -559,9 +559,13 @@ void filter_ref_node(struct filter_node *n);
 void filter_unref_node(struct filter_node *n);
 
 void filter_dump_node(struct ul_jsonwrt *json, struct filter_node *n);
+int filter_eval_node(struct libscols_filter *fltr, struct filter_node *n,
+			struct libscols_line *ln, int *status);
 
 /* param */
 void filter_dump_param(struct ul_jsonwrt *json, struct filter_param *n);
+int filter_eval_param(struct libscols_filter *fltr, struct filter_param *n,
+			struct libscols_line *ln, int *status);
 void filter_free_param(struct filter_param *n);
 
 int filter_next_param(struct libscols_filter *fltr,
-- 
2.47.3