From d4b977d0904a1dea37922dac60d3bb37f9769230 Mon Sep 17 00:00:00 2001
From: David Walter Seikel
Date: Thu, 5 Jan 2012 04:47:56 +1000
Subject: Add a simple flex + btyacc stub.

Will be fleshed out soon with LSL grammer.
---
 LuaSL/src/LuaSL_LSL_tree.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 LuaSL/src/LuaSL_LSL_tree.c

(limited to 'LuaSL/src/LuaSL_LSL_tree.c')

diff --git a/LuaSL/src/LuaSL_LSL_tree.c b/LuaSL/src/LuaSL_LSL_tree.c
new file mode 100644
index 0000000..78da8e7
--- /dev/null
+++ b/LuaSL/src/LuaSL_LSL_tree.c
@@ -0,0 +1,63 @@
+/*
+ * Implementation of functions used to build the abstract syntax tree.
+ */
+ 
+#include "LuaSL_LSL_tree.h"
+#include <stdlib.h>
+ 
+/**
+ * @brief Allocates space for expression
+ * @return The expression or NULL if not enough memory
+ */
+static SExpression* allocateExpression()
+{
+        SExpression* b = malloc(sizeof *b);
+ 
+        if( b == NULL ) return NULL;
+ 
+        b->type = eVALUE;
+        b->value = 0;
+ 
+        b->left = NULL;
+        b->right = NULL;
+ 
+        return b;
+}
+ 
+SExpression* createNumber(int value)
+{
+        SExpression* b = allocateExpression();
+ 
+        if( b == NULL ) return NULL;
+ 
+        b->type = eVALUE;
+        b->value = value;
+ 
+        return b;
+}
+ 
+SExpression *createOperation( 
+                        EOperationType type,
+                        SExpression *left,
+                        SExpression *right)
+{
+        SExpression* b = allocateExpression();
+ 
+        if( b == NULL ) return NULL;
+ 
+        b->type = type;
+        b->left = left;
+        b->right = right;
+ 
+        return b;
+}
+ 
+void deleteExpression(SExpression *b)
+{
+        if (b == NULL) return;
+ 
+        deleteExpression(b->left);
+        deleteExpression(b->right);
+ 
+        free(b);
+}
-- 
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