wip

README.md

@@ -0,0 +1,14 @@
+expression := literal | binary | grouping
+
+literal := INTEGER
+
+grouping := "(" expression ")"
+
+binary := expression operator expression
+
+operator := "+" | "-" | "*" | "/" | "%"
+
+expression 
+term    factor "+" | "-" factor
+factor  primary  "*" | "/" primary
+primary INTEGER | "(" expression ")"

src/Expression.cpp

@@ -0,0 +1,14 @@
+#include "Expression.h"
+
+ExpressionInvalid Expression::Invalid = ExpressionInvalid();
+
+std::string ExpressionInvalid::toString() {
+    return "Invalid";
+}
+
+/*ExpressionInteger::ExpressionInteger(Token token) {
+}
+
+std::string ExpressionInteger::toString() {
+    return "INTEGER";
+}*/

src/Expression.h

@@ -1,8 +1,25 @@
 #ifndef EXPRESSION_H
 #define EXPRESSION_H
 
+#include "Token.h"
+
+class ExpressionInvalid;
+
 class Expression {
+public:
+    static ExpressionInvalid Invalid;
+
+    virtual std::string toString() = 0;
+};
+
+class ExpressionInvalid {
 
 };
 
+/*class ExpressionInteger: Expression {
+public:
+    ExpressionInteger(Token token);
+    std::string toString() override;
+};*/
+
 #endif

src/Parser.cpp

@@ -1,5 +1,24 @@
 #include "Parser.h"
 
-std::vector Parser::getExpressions() {
+Parser::Parser(std::vector<Token> tokens) : tokens(tokens) {
+}
 
+/*Expression Parser::getExpression() {
+    return term();
+}*/
+
+/*Expression Parser::term() {
+
+}*/
+
+/*Expression Parser::primary() {
+
+}*/
+
+Expression Parser::matchInteger() {
+    //Token token = tokens.at(currentIndex);
+    //if (token.getKind() == Token::Kind::INTEGER)
+    //    ExpressionInteger(token);
+
+    return Expression::Invalid;
 }

src/Parser.h

@@ -2,13 +2,22 @@
 #define PARSER_H
 
 #include <vector>
-#include <Token.h>
-#include <Expression.h>
+#include "Token.h"
+#include "Expression.h"
 
 class Parser {
+private:
+    std::vector<Token> tokens;
+    int currentIndex = 0;
+
+    //Expression term();
+    //Expression primary();
+
+    Expression matchInteger();
+
 public:
     Parser(std::vector<Token> tokens);
-    std::vector<Expression> getExpressions();
+    //Expression getExpression();
 };
 
 #endif