word completion in the C runtime. The runtime/python/test.py example is now using readline with word completion

src/runtime/python/test.py

@@ -1,26 +1,63 @@
-import sys
 import pgf
+import sys
+import sets
+import readline
 
 sys.stdout.write("loading...")
 sys.stdout.flush();
 gr = pgf.readPGF("../../../treebanks/PennTreebank/ParseEngAbs.pgf")
 sys.stdout.write("\n")
 
+source_lang = gr.languages["ParseEng"]
+target_lang = gr.languages["ParseBul"]
+
 we = pgf.readExpr("UttImpSg PPos (ImpVP (UseV try_V))")
-print gr.languages["ParseEng"].linearize(we)
+print source_lang.linearize(we)
 
 sys.stdout.write("start cat: "+gr.startCat+"\n\n")
 
+class Completer():
+	def __init__(self, lang):
+		self.gr = lang
+		
+	def complete(self, prefix, state):
+		if state == 0:
+			line = readline.get_line_buffer()
+			line = line[0:readline.get_begidx()]
+			self.i = source_lang.getCompletions(line, prefix=prefix)
+			self.tokens = sets.Set()
+
+		if len(self.tokens) > 50:
+			return None
+
+		while True:
+			try:
+				(p,t) = self.i.next()
+				if t not in self.tokens:
+					self.tokens.add(t)
+					return t
+			except StopIteration:
+				return None
+
+completer = Completer(source_lang)
+readline.set_completer(completer.complete)
+readline.parse_and_bind("tab: complete")
+
 while True:
-	sys.stdout.write("> ")
-	line = sys.stdin.readline();
-	if line == '':
+	try:
+		line = raw_input("> ");
+	except EOFError:
 		sys.stdout.write("\n")
-		break;
+		readline.set_completer(None)
+		break
+	except KeyboardInterrupt:
+		sys.stdout.write("\n")
+		readline.set_completer(None)
+		break
 
 	try:
-		for (p,e) in gr.languages["ParseEng"].parse(line, n=5):
+		for (p,e) in source_lang.parse(line, n=1):
 			sys.stdout.write("["+str(p)+"] "+str(e)+"\n")
-			print gr.languages["ParseEngBul"].linearize(e)
+			print target_lang.linearize(e)
 	except pgf.ParseError as e:
 		print e.message