1 files changed, 68 insertions, 0 deletions
diff --git a/qpid/python/qpid/parser.py b/qpid/python/qpid/parser.py
new file mode 100644
index 0000000000..233f0a8469
--- /dev/null
+++ b/qpid/python/qpid/parser.py
@@ -0,0 +1,68 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+
+class ParseError(Exception):
+
+  def __init__(self, token, *expected):
+    line, ln, col = token.line_info()
+    exp = ", ".join(map(str, expected))
+    if len(expected) > 1:
+      exp = "(%s)" % exp
+    if expected:
+      msg = "expecting %s, got %s line:%s,%s:%s" % (exp, token, ln, col, line)
+    else:
+      msg = "unexpected token %s line:%s,%s:%s" % (token, ln, col, line)
+    Exception.__init__(self, msg)
+    self.token = token
+    self.expected = expected
+
+class Parser:
+
+  def __init__(self, tokens):
+    self.tokens = tokens
+    self.idx = 0
+
+  def next(self):
+    return self.tokens[self.idx]
+
+  def matches(self, *types):
+    return self.next().type in types
+
+  def eat(self, *types):
+    if types and not self.matches(*types):
+      raise ParseError(self.next(), *types)
+    else:
+      t = self.next()
+      self.idx += 1
+      return t
+
+  def eat_until(self, *types):
+    result = []
+    while not self.matches(*types):
+      result.append(self.eat())
+    return result
+
+  def remove(self, start, end):
+    start_idx = self.tokens.index(start)
+    end_idx = self.tokens.index(end) + 1
+    del self.tokens[start_idx:end_idx]
+    self.idx -= end_idx - start_idx
+
+  def reset(self):
+    self.idx = 0