Initialise

ziffers/ebnf.py

@@ -0,0 +1,29 @@
+ebnf = r"""
+    expr = (number ws?)* 
+    number = factor additive*
+    additive = ("+"/"-") factor
+    factor = primary multiplicative*
+    multiplicative = ("*" / "/") primary
+    primary = parens / neg / number
+    parens   = "(" number ")"
+    neg = "-" primary 
+    number = ((~"[0-9]"+ "."? ~"[0-9]"*) / ("." ~"[0-9]"+)) (("e"/"E") ("-"/"+") ~"[0-9]"+)?
+    ws        = ~"\s*"
+    lpar      = "("
+    rpar      = ")"
+    lbra      = "["
+    rbra      = "]"
+    lcbra     = "{"
+    rcbra     = "}"
+    lt        = "<"
+    gt        = ">"
+    comma     = ","
+    octup     = "^"
+    octdown   = "_"
+    barsign   = "|"
+    plus = "+"
+    minus = "-"
+    times = "*"
+    div   = "/"
+    emptyline = ws+
+    """