From 9a71e795dc14c401e501125865b2a15fe59f617b Mon Sep 17 00:00:00 2001
From: Tucker Evans <tuckerevans24@gmail.com>
Date: Sun, 14 Jul 2019 13:24:52 -0400
Subject: Add parse tree

---
 tree.c | 118 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tree.h |  27 +++++++++++++++
 2 files changed, 145 insertions(+)
 create mode 100644 tree.c
 create mode 100644 tree.h

diff --git a/tree.c b/tree.c
new file mode 100644
index 0000000..25c7f7e
--- /dev/null
+++ b/tree.c
@@ -0,0 +1,118 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+
+#include "tree.h"
+#include "y.tab.h"
+
+extern void yyerror(char*);
+
+/* parse tree funcs */
+ptree* mktree(type, l, r)
+int type;
+ptree *l, *r;
+{
+	ptree *t = (ptree*)malloc(sizeof(ptree));
+	assert(t);
+
+	t->type = type;
+	t->l = l;
+	t->r = r;
+
+	return t;
+}
+
+ptree* mkid(str)
+char *str;
+{
+	ptree *p = mktree(ID, NULL, NULL);
+	p->attr.sval = strdup(str); /* memory leak? double strdup*/
+	return p;
+}
+
+ptree* mkinum(n)
+int n;
+{
+	ptree *p = mktree(INUM, NULL, NULL);
+	p->attr.ival = n;
+	return p;
+}
+
+ptree* mkrnum(n)
+float n;
+{
+	ptree *p = mktree(RNUM, NULL, NULL);
+	p->attr.rval = n;
+	return p;
+}
+
+ptree * mkop(type, sub, l, r)
+int type, sub;
+ptree *l, *r;
+{
+	ptree *p = mktree(type, l, r);
+	p->attr.opval = sub;
+	return p;
+}
+
+void print_tree(t)
+ptree *t;
+{
+	fprintf(stderr, "\n\n");
+	aux_tree_print(t, 0);
+	return;
+}
+
+void aux_tree_print(t, spaces)
+ptree* t;
+int spaces;
+{
+	int i;
+	if ( t ) {
+		for (i = 0; i < spaces; i++)
+			fprintf(stderr," ");
+		switch (t->type) {
+		
+			case ADDOP:
+				fprintf(stderr, "[ADDOP]");
+				break;
+			case MULOP:
+				fprintf(stderr, "[MULOP]");
+				break;
+			case RELOP:
+				fprintf(stderr, "[RELOP]");
+				break;
+			case NOT:
+				fprintf(stderr, "[NOT]");
+				break;
+			case ARRAY_ACCESS:
+				fprintf(stderr, "[ARRAY ACCESS]");
+				break;
+			case LIST:
+				fprintf(stderr, "[LIST]");
+				break;
+			case ID:
+				fprintf(stderr, "[ID: %s]", t->attr.sval);
+				break;
+			case INUM:
+				fprintf(stderr, "[INUM: %d]", t->attr.ival);
+				break;
+			case RNUM:
+				fprintf(stderr, "[RNUM: %f]", t->attr.rval);
+				break;
+			case ASSIGNOP:
+				fprintf(stderr, "[ASSIGN]");
+				break;
+			default:
+				fprintf(stderr, "\t%d", t->type);
+				yyerror("Error in tree_print");
+		}
+		fprintf(stderr,"\n");
+		aux_tree_print(t->l, spaces + 2);
+		fprintf(stderr,"\n");
+		aux_tree_print(t->r, spaces + 2);
+		fprintf(stderr,"\n");
+	}
+
+}
diff --git a/tree.h b/tree.h
new file mode 100644
index 0000000..b7349af
--- /dev/null
+++ b/tree.h
@@ -0,0 +1,27 @@
+#ifndef TREE_H
+#define TREE_H
+
+typedef struct parse_tree {
+	int type;
+	union {
+		int ival; /* NUM */
+		float rval; /* RNUM */
+		char *sval; /* ID */
+		int opval; /* RELOP: LT LE GT GE EQ NE
+			      ADDOP: PLUS MINUS OR
+			      MULOP: MUL DIV
+		*/
+	} attr;
+	struct parse_tree *l, *r;
+} ptree;
+
+void aux_tree_print(ptree*, int);
+void print_tree(ptree*);
+
+ptree* mktree(int, ptree*, ptree*);
+ptree* mkid(char*);
+ptree* mkinum(int);
+ptree* mkrnum(float);
+ptree* mkop(int, int, ptree*, ptree*);
+
+#endif
-- 
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