1 files changed, 102 insertions, 0 deletions
diff --git a/examples/params.rl b/examples/params.rl
new file mode 100644
index 0000000..a8ffeae
--- /dev/null
+++ b/examples/params.rl
@@ -0,0 +1,102 @@
+/*
+ * Parse command line arguments.
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#define BUFLEN 1024
+
+struct params
+{
+	char buffer[BUFLEN+1];
+	int buflen;
+	int cs;
+};
+
+%%{
+	machine params;
+	access fsm->;
+
+	# A buffer to collect argurments
+
+	# Append to the buffer.
+	action append {
+		if ( fsm->buflen < BUFLEN )
+			fsm->buffer[fsm->buflen++] = fc;
+	}
+
+	# Terminate a buffer.
+	action term {
+		if ( fsm->buflen < BUFLEN )
+			fsm->buffer[fsm->buflen++] = 0;
+	}
+
+	# Clear out the buffer
+	action clear { fsm->buflen = 0; }
+
+	action help { printf("help\n"); }
+	action version { printf("version\n"); }
+	action output { printf("output: \"%s\"\n", fsm->buffer); }
+	action spec { printf("spec: \"%s\"\n", fsm->buffer); }
+	action mach { printf("machine: \"%s\"\n", fsm->buffer); }
+
+	# Helpers that collect strings
+	string = [^\0]+ >clear $append %term;
+
+	# Different arguments.
+	help = ( '-h' | '-H' | '-?' | '--help' ) 0 @help;
+	version = ( '-v' | '--version' ) 0 @version;
+	output = '-o' 0? string 0 @output;
+	spec = '-S' 0? string 0 @spec;
+	mach = '-M' 0? string 0 @mach;
+
+	main := ( 
+		help | 
+		version | 
+		output |
+		spec |
+		mach
+	)*;
+}%%
+
+%% write data;
+
+void params_init( struct params *fsm )
+{
+	fsm->buflen = 0;
+	%% write init;
+}
+
+void params_execute( struct params *fsm, const char *data, int len )
+{
+	const char *p = data;
+	const char *pe = data + len;
+
+	%% write exec;
+}
+
+int params_finish( struct params *fsm )
+{
+	if ( fsm->cs == params_error )
+		return -1;
+	if ( fsm->cs >= params_first_final )
+		return 1;
+	return 0;
+}
+
+#define BUFSIZE 2048
+
+int main( int argc, char **argv )
+{
+	int a;
+	struct params params;
+
+	params_init( &params );
+	for ( a = 1; a < argc; a++ )
+		params_execute( &params, argv[a], strlen(argv[a])+1 );
+	if ( params_finish( &params ) != 1 )
+		fprintf( stderr, "params: error processing arguments\n" );
+
+	return 0;
+}