Switch to sqlite3's lemon parser generator.

This commit drops the flex + bison code in favor to a hand-written
lexer and a new grammar file in lemon syntax.

The change results in a much smaller binary and easier to maintain
code. Code required to build and maintain the AST has been split
off into the ast.c and ast.h files.

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/main.c b/main.c
index eaa1ee0..ebd52c0 100644
--- a/main.c
+++ b/main.c
@@ -263,8 +263,9 @@ filter_json(int opt, struct json_object *jsobj, char *expr)
 
 	if (!state || state->error)
 	{
-		fprintf(stderr, "In expression '%s': %s\n",
-		        expr, state ? state->error : "Out of memory");
+		fprintf(stderr, "Syntax error near {%s}: %s\n",
+		        state ? expr + state->erroff : expr,
+				state ? state->error : "Out of memory");
 
 		goto out;
 	}