simple calculator example

1 files changed, 44 insertions, 0 deletions

diff --git a/demos/sample-files/calc-defs.c b/demos/sample-files/calc-defs.c
new file mode 100644
index 0000000..de1f705
--- /dev/null
+++ b/demos/sample-files/calc-defs.c
@@ -0,0 +1,44 @@
+#include <stdio.h>
+
+#include "parts/symbol.h"
+enum symbol {
+    PLUS = 0,
+    MINUS,
+    LPAREN,
+    RPAREN,
+    NUM,
+    END_INPUT,
+
+    EP, E, T,
+    SYMBOLS_END,
+};
+
+size_t total_symbols = SYMBOLS_END;
+
+IMPLEMENT_FUNCPTR(int, symbol_is_terminal, (symbol s)) { return s < EP; }
+IMPLEMENT_FUNCPTR(int, symbol_is_input_end, (symbol s)) { return s == END_INPUT; }
+IMPLEMENT_FUNCPTR(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)}
+static 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, -->, NUM),
+};
+
+struct production *grammar = _grammar;
+size_t total_productions = sizeof(_grammar)/sizeof(*_grammar);
+
+// #include "???.h"
+char **semantic_action_str = (char *([])){
+    "v = A(0);",
+    "v = A(0) + A(2);",
+    "v = A(0) - A(2);",
+    "v = A(0);",
+    "v = A(1);",
+    "v = A(0);",
+};