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.cpp | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

(limited to 'src/parser.cpp')

diff --git a/src/parser.cpp b/src/parser.cpp
index 153b6fe..1f9a193 100644
--- a/src/parser.cpp
+++ b/src/parser.cpp
@@ -20,6 +20,58 @@ Parser::~Parser()
 
 void Parser::parse()
 {
+    for(;;)
+    {
+        lex.nextToken();
+        expr();
+
+        for( TokenStack::iterator i = tsStack.begin(); i; i++ )
+        {
+            Bu::sio << *i << " ";
+        }
+    }
+}
+
+void Parser::expr()
+{
+    if( lex[0].eType == Token::tVariable &&
+        lex[1].eType == Token::tEquals )
+    {
+        // Assignment!
+        expr();
+        return;
+    }
+    exprP();
+}
+
+void Parser::exprP()
+{
+    switch( lex[0].eType )
+    {
+        case Token::tNumber:
+        case Token::tVariable:
+            tsStack.push( lex[0] );
+            lex.nextToken();
+            break;
+
+        case Token::tOpenParen:
+            lex.nextToken();
+            expr();
+            if( lex[0].eType != Token::tCloseParen )
+            {
+                throw Bu::ExceptionBase("Expected close paren");
+            }
+            lex.nextToken();
+            break;
+
+        case Token::tMinus:
+            lex.nextToken();
+            exprP();
+            tsStack.push( Token( Token::tNegate ) );            
+            break;
+    }
+}
+/*
     for(;;)
     {
         Token t = lex.nextToken();
@@ -158,6 +210,7 @@ void Parser::parse()
         }
     }
 }
+*/
 
 Number Parser::getVariable( const Bu::String &sName )
 {
@@ -171,6 +224,7 @@ void Parser::setVariable( const Bu::String &sName, const Number &rValue )
 
 void Parser::unwind()
 {
+    /*
     for(;;)
     {
         DBS_START( PARSE );
@@ -312,6 +366,7 @@ void Parser::unwind()
             getPriority( t.eType ) )
             return;
     }
+    */
 }
 
 int Parser::reqTokens( Token::Type eType )
-- 
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