From 0321e6e39b8cf24718cf853c28f0f35443753264 Mon Sep 17 00:00:00 2001
From: Mike Buland <eichlan@xagasoft.com>
Date: Wed, 30 Nov 2016 13:57:04 -0700
Subject: Working on the parser, some issues.

---
 src/parser.h | 37 +++++++++++++++++++++++++++++++++++--
 1 file changed, 35 insertions(+), 2 deletions(-)

(limited to 'src/parser.h')

diff --git a/src/parser.h b/src/parser.h
index e163212..d50951b 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -13,6 +13,35 @@ namespace Bu
 
 class Lexer;
 
+/**
+ *
+ * expr: literal
+ *     | variable
+ *     | expr '+' expr
+ *     | expr '-' expr
+ *     | expr '*' expr
+ *     | expr '/' expr
+ *     | '(' expr ')'
+ *     | '-' expr
+ *     | variable '=' expr
+ *     ;
+ *
+ * -----
+ * 
+ * expr': literal
+ *      | variable
+ *      | '(' expr ')'
+ *      | '-' expr'
+ *      ;
+ *
+ * expr: expr' '+' expr
+ *     | expr' '-' expr
+ *     | expr' '*' expr
+ *     | expr' '/' expr
+ *     | expr'
+ *     | variable '=' expr
+ *     ;
+ */
 class Parser
 {
 public:
@@ -23,6 +52,10 @@ public:
     Number getVariable( const Bu::String &sName );
     void setVariable( const Bu::String &sName, const Number &rValue );
 
+private:
+    void expr();
+    void exprP();
+
 private:
     void unwind();
     int reqTokens( Token::Type eType );
@@ -34,8 +67,8 @@ private:
     Bu::Stream &rOut;
     typedef Bu::List<Token> TokenStack;
     typedef Bu::Hash<Bu::String, Number> VarHash;
-    TokenStack tsTerminal;
-    TokenStack tsNonTerminal;
+    TokenStack tsStack;
+//    TokenStack tsNonTerminal;
     Number nZero;
     VarHash hVars;
 };
-- 
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