From 89eeeff54f0b3ce30be5b046fc3899fdeb5ebb40 Mon Sep 17 00:00:00 2001
From: Mike Buland <eichlan@xagasoft.com>
Date: Sat, 17 Feb 2007 16:31:55 +0000
Subject: Tweaked the stream classes, added an example, and the begining of a
 formula parser.

---
 src/formula.h | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 src/formula.h

(limited to 'src/formula.h')

diff --git a/src/formula.h b/src/formula.h
new file mode 100644
index 0000000..1eccd36
--- /dev/null
+++ b/src/formula.h
@@ -0,0 +1,62 @@
+#ifndef FORMULA_H
+#define FORMULA_H
+
+#include <stdint.h>
+
+#include <stack>
+#include "sbuffer.h"
+
+#include "exceptionbase.h"
+
+subExceptionDecl( ParseException );
+
+/**
+ *
+ */
+class Formula
+{
+public:
+	Formula();
+	virtual ~Formula();
+
+	double run( const char *sFormula );
+
+private:
+	enum
+	{
+		symEOS,
+		symAdd,
+		symSubtract,
+		symMultiply,
+		symDivide,
+		symOpenParen,
+		symCloseParen,
+		symNumber,
+		symVariable
+	};
+
+	typedef struct Token
+	{
+		Token() {}
+		Token( uint8_t nSym ) : nSym( nSym ) { }
+		Token( uint8_t nSym, double dNum ) : nSym( nSym ) { val.num = dNum; }
+		uint8_t nSym;
+		union 
+		{
+			double num;
+		} val;
+	} Token;
+
+	std::stack<Token> sToken;
+	Token tLook;
+	int nState;
+	SBuffer sBuf;
+
+private:
+	void push();
+	void state();
+	Token nextToken();
+	void printToken( Token &tok );
+};
+
+#endif
-- 
cgit v1.2.3