From: Michael D. Lowis <mike.lowis@gentex.com>
Date: Tue, 30 Jul 2019 21:09:05 +0000 (-0400)
Subject: sketched out pratt parser
X-Git-Url: https://git.mdlowis.com/?a=commitdiff_plain;h=2d79201d14c4ea8f434ec88430edadd78becd8f4;p=proto%2Fsclpl-rb.git

sketched out pratt parser
---

diff --git a/compile.rb b/compile.rb
index aa3186a..99ff7ef 100755
--- a/compile.rb
+++ b/compile.rb
@@ -159,6 +159,8 @@ class Parser
     primary: 10,
   }
 
+  RULES = {}
+
   def initialize(path)
     @lex = Lexer.new(path)
     @prev = nil
@@ -242,11 +244,26 @@ class Parser
     end
   end
 
-  def parseLevel(level)
+  def expression()
+    parseLevel(:assign)
   end
 
-  def expression()
-    constant()
+  def getRule(tok)
+    RULES[tok.type]
+  end
+
+  def parseLevel(level)
+#    advance()
+#    prefixRule = getRule(@prev)[:prefix]
+#    if not prefixRule then
+#      error("expected an expression")
+#    end
+#    send(prefixRule)
+#    while (level <= LEVELS[getRule(@curr)[:level]])
+#      advance()
+#      infixRule = getRule(@prev)[:infix]
+#      send(infixRule)
+#    end
   end
 
   def constant()