1 files changed, 61 insertions, 0 deletions
diff --git a/demos/instant-parser.c b/demos/instant-parser.c
new file mode 100644
index 0000000..3a82b07
--- /dev/null
+++ b/demos/instant-parser.c
@@ -0,0 +1,61 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "parts/symbol.h"
+enum symbol {
+    PLUS = 0,
+    MINUS,
+    LPAREN,
+    RPAREN,
+    N0, N1,
+    END_INPUT,
+
+    EP, E, T, N,
+    SYMBOLS_END,
+};
+
+size_t total_symbols = SYMBOLS_END;
+
+int symbol_is_terminal(symbol s)    { return s < EP; }
+int symbol_is_input_end(symbol s)   { return s == END_INPUT; }
+int symbol_is_valid(symbol s)       { return s < SYMBOLS_END; }
+
+#include "parts/grammar.h"
+#define PROD(LHS, _, ...) {LHS, (symbol[]){__VA_ARGS__}, sizeof((symbol[]){__VA_ARGS__})/sizeof(symbol)}
+struct production grammar[] = {
+    PROD(EP, ->, E, END_INPUT),
+    PROD(E, -->, E, PLUS, T),
+    PROD(E, -->, E, MINUS, T),
+    PROD(E, -->, T),
+    PROD(T, -->, LPAREN, E, RPAREN),
+    PROD(T, -->, N),
+    PROD(N, -->, N0),
+    PROD(N, -->, N1),
+};
+
+const size_t total_productions = sizeof(grammar)/sizeof(*grammar);
+
+#include "parts/toklist.h"
+static symbol toklist[] = {N0, PLUS, N1, MINUS, N0, END_INPUT};
+static symbol *tok = toklist;
+
+symbol toklist_eat() { return *(tok++); } // unsafe
+symbol toklist_peek() { return *tok; }    // unsafe
+
+#include "slr-table.c"
+#include "util-tables.c"
+#include "lr-parser.c"
+
+int main(void)
+{
+    util_tables_fill();
+    table_fill();
+
+    int r = 0;
+    r = lr_parser();
+
+    table_free();
+    util_tables_free();
+
+    return r;
+}