4 files changed, 125 insertions, 0 deletions
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..71bcbce
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,13 @@
+CS=parser.c ast.c
+CFLAGS=-Wall -Wpedantic -std=c99
+
+badthing: $(CS)
+	$(CC) $(CFLAGS) -o badthing $(CS)
+
+parser.c: grammar.peg
+	minipeg -o parser.c grammar.peg 
+
+clean:
+	rm badthing parser.c
+
+.PHONY: clean
diff --git a/ast.c b/ast.c
new file mode 100644
index 0000000..07c0f34
--- /dev/null
+++ b/ast.c
@@ -0,0 +1,46 @@
+#include "ast.h"
+#include <stdlib.h>
+#include <stddef.h>
+#include <stdio.h>
+
+AstVec astvec_new() {
+	AstNode *vals = malloc(2 * sizeof(AstNode));
+	return (AstVec){
+		.len = 0,
+		.cap = 2,
+		vals = vals
+	};
+}
+
+void astvec_append(AstVec *v, AstNode val) {
+	if (v->len == v->cap) {
+		size_t newcap = v->cap * 2;
+		printf("%ld to %ld\n", v->cap, newcap);
+		v->vals = realloc(v->vals, newcap * sizeof(AstNode));
+		v->cap = newcap;
+	}
+	v->vals[v->len] = val;
+	v->len ++;
+}
+
+AstNode astnode_new_num(int n) {
+	return (AstNode){
+		.ty = AST_NUM,
+		.as = {
+			.num = n,
+		},
+	};
+}
+
+AstNode astnode_new_list() {
+	return (AstNode){
+		.ty = AST_LIST,
+		.as = {
+			.list = astvec_new()
+		}
+	};
+}
+
+
+
+
diff --git a/ast.h b/ast.h
new file mode 100644
index 0000000..84a3341
--- /dev/null
+++ b/ast.h
@@ -0,0 +1,39 @@
+#ifndef _ast_h
+#define _ast_h
+
+#include <stdlib.h>
+#include <stddef.h>
+
+typedef enum {
+	AST_NUM,
+	AST_LIST,
+} AstTy;
+
+struct _astnode;
+typedef struct _astnode AstNode;
+
+typedef struct {
+	size_t len;
+	size_t cap;
+	AstNode *vals;
+} AstVec;
+
+struct _astnode {
+	AstTy ty;
+	union {
+		int num;
+		AstVec list;
+	} as;
+};
+
+
+AstVec astvec_new();
+void astvec_append(AstVec *v, AstNode val);
+
+AstNode astnode_new_num(int n);
+AstNode astnode_new_list();
+
+
+
+
+#endif
diff --git a/grammar.peg b/grammar.peg
new file mode 100644
index 0000000..fc7db48
--- /dev/null
+++ b/grammar.peg
@@ -0,0 +1,27 @@
+%{
+#include <stdio.h>
+#include <stdlib.h>
+#include "ast.h"
+
+AstVec numbers;
+%}
+
+
+Numberlist = ( n:NUMBER { astvec_append(&numbers, astnode_new_num(n)); }
+             )+
+
+
+NUMBER = < [0-9]+ > [ \t]* { $$ = atoi(yytext); }
+
+%%
+
+int main() {
+	printf("len %ld cap %ld vals %p\n", numbers.len, numbers.cap, numbers.vals);
+	while (yyparse())   ;
+	printf("len %ld cap %ld vals %p\n", numbers.len, numbers.cap, numbers.vals);
+	for (int i = 0; i < numbers.len; i++) {
+		printf("[%d] ",numbers.vals[i].as.num);
+	}
+
+	return 0;
+}