--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Expression.h Mon Feb 03 20:12:44 2014 +0200
@@ -0,0 +1,88 @@
+#ifndef BOTC_EXPRESSION_H
+#define BOTC_EXPRESSION_H
+#include "Parser.h"
+
+class DataBuffer;
+class ExpressionSymbol;
+class ExpressionValue;
+
+// =============================================================================
+//
+class Expression final
+{
+ public:
+ Expression (BotscriptParser* parser, EType reqtype, Lexer* lx);
+ ~Expression();
+ ExpressionValue* GetResult();
+
+ private:
+ Lexer* mLexer;
+ List<ExpressionSymbol*> mSymbols;
+ EType mType;
+ ExpressionValue* mResult;
+ BotscriptParser* mParser;
+
+ ExpressionValue* Evaluate(); // Process the expression and yield a result
+ ExpressionSymbol* ParseSymbol();
+ String GetTokenString();
+ void Verify(); // Ensure the expr is valid
+};
+
+// =============================================================================
+//
+class ExpressionSymbol
+{
+ public:
+ enum EExpressionSymbolType
+ {
+ eOperator,
+ eOperand,
+ eColon,
+ };
+
+ PROPERTY (private, EExpressionSymbolType, Type, NO_OPS, STOCK_WRITE)
+};
+
+// =============================================================================
+//
+class ExpressionOperator final : public ExpressionSymbol
+{
+ PROPERTY (public, int, ID, NO_OPS, STOCK_WRITE)
+
+ public:
+ ExpressionOperator (int id);
+};
+
+// =============================================================================
+//
+class ExpressionValue final : public ExpressionSymbol
+{
+ PROPERTY (public, int, Value, BOOL_OPS, STOCK_WRITE)
+ PROPERTY (public, DataBuffer*, Buffer, NO_OPS, STOCK_WRITE)
+ PROPERTY (public, EType, ValueType, NO_OPS, STOCK_WRITE)
+
+ public:
+ ExpressionValue (EType valuetype);
+
+ void ConvertToBuffer();
+
+ inline bool IsConstexpr() const
+ {
+ return GetBuffer() == null;
+ }
+};
+
+// =============================================================================
+//
+// This class represents a ":" in the expression. It serves as the colon for the
+// ternary ?: operator. It's not an operand nor is an operator, nor can we just
+// skip it so it is its own thing here.
+//
+class ExpressionColon final : public ExpressionSymbol
+{
+ public:
+ ExpressionColon() :
+ mType (eColon) {}
+};
+
+#endif // BOTC_EXPRESSION_H
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