Add (embarrassing) lexer to parse contract interfaec

parse.py

@@ -0,0 +1,131 @@
+import sys
+import logging
+
+import ply.lex as lex
+
+logging.basicConfig(level=logging.DEBUG)
+logg = logging.getLogger()
+
+
+tokens = (
+         'NUMBER',
+#         'PLUS',
+#         'MINUS',
+#         'TIMES',
+#         'DIVIDE',
+         'LPAREN',
+         'RPAREN',
+      )
+
+methods = {}
+contract = False
+method = None
+typ = None
+function = False
+signature = False
+
+
+# Define a rule so we can track line numbers
+def t_newline(t):
+    r'\n+'
+    t.lexer.lineno += len(t.value)
+
+def t_comment(t):
+    r'//.+'
+    pass
+
+
+def t_item(t):
+    r';'
+    global function, signature, method, typ
+
+    signature = False
+    function = False
+    method = None
+    typ = None
+
+
+def t_contract(t):
+    r'(interface|contract).+\{'
+    global contract
+    if contract:
+        raise SyntaxError('this meagre parser will only handle one interface/contract definition per file')
+    contract = True
+
+
+def t_pragma(t):
+    r'pragma.+'
+    pass
+
+
+def t_function(t):
+    r'function'
+    global function, contract
+
+    if not contract:
+        raise SyntaxError('functions must be within inteface/contract definitions')
+    function = True
+
+
+def t_LPAREN(t):
+    r'\('
+    global function, signature
+
+    if not function:
+        return
+    signature = True
+
+
+def t_RPAREN(t):
+    r'\)'
+    global signature
+
+    signature = None
+
+
+def t_WORD(t):
+    r'([\w\d]+)'
+    global method, typ, signature
+
+    if typ and not signature:
+        return
+
+    if function and method == None:
+        method = t.value
+        methods[method] = []
+    elif typ == None and signature:
+        typ = t.value
+        methods[method].append(typ)
+
+
+def t_COMMA(t):
+    r','
+    global typ
+
+    typ = None
+
+
+# Error handling rule
+def t_error(t):
+    print("Illegal character '%s'" % t.value[0])
+    t.lexer.skip(1)
+
+# A string containing ignored characters (spaces and tabs)
+t_ignore  = ' \t}'
+
+# Build the lexer
+lexer = lex.lex()
+
+# Tokenize
+f = open(sys.argv[1], 'r')
+while True:
+    l = f.readline()
+    if not l:
+        break
+    lexer.input(l)
+    tok = lexer.token()
+    logg.debug('token {}'.format(tok))
+
+
+for k in methods.keys():
+    print('{}({})'.format(k, ','.join(methods[k])))