Creating a branch for experimenting with some ideas for JMS client.rajith_jms_client

git-svn-id: https://svn.apache.org/repos/asf/qpid/branches/rajith_jms_client@1128369 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 119 insertions, 0 deletions

diff --git a/qpid/java/common/templating.py b/qpid/java/common/templating.py
new file mode 100644
index 0000000000..732e96fa60
--- /dev/null
+++ b/qpid/java/common/templating.py
@@ -0,0 +1,119 @@
+#
+# 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 Parser:
+
+  def __init__(self, **kwargs):
+    self.output = ""
+    self.environ = {"out": self.parse}
+    for k, v in kwargs.items():
+      self.environ[k] = v
+    self.text = ""
+    self.level = 0
+    self.line = None
+
+  def action(self, actor):
+    text = self.text
+    self.text = ""
+    actor(text)
+
+  def out(self, text):
+    self.output += text
+
+  def prefix_lines(self, text):
+    return "%s%s" % ("\n"*(self.line - 1 - text.count("\n")), text)
+
+  def evaluate(self, text):
+    self.out(str(eval(self.prefix_lines(text), self.environ, self.environ)))
+
+  def execute(self, text):
+    exec self.prefix_lines(text) in self.environ, self.environ
+
+  def parse(self, input):
+    old_line = self.line
+    try:
+      state = self.start
+      self.line = 1
+      for ch in input:
+        state = state(ch)
+        if ch == "\n":
+          self.line += 1
+      if state == self.start:
+        self.action(self.out)
+      elif state == self.alnum:
+        self.action(self.evaluate)
+      else:
+        raise ParseError()
+    finally:
+      self.line = old_line
+
+  def start(self, ch):
+    if ch == "$":
+      return self.dollar
+    else:
+      self.text += ch
+      return self.start
+
+  def dollar(self, ch):
+    if ch == "$":
+      self.text += "$"
+      return self.start
+    elif ch == "(":
+      self.action(self.out)
+      return self.expression
+    elif ch == "{":
+      self.action(self.out)
+      return self.block
+    else:
+      self.action(self.out)
+      self.text += ch
+      return self.alnum
+
+  def alnum(self, ch):
+    if ch.isalnum():
+      self.text += ch
+      return self.alnum
+    else:
+      self.action(self.evaluate)
+      self.text += ch
+      return self.start
+
+  def match(self, ch, start, end):
+    if ch == start:
+      self.level += 1
+    if ch == end:
+      self.level -= 1
+
+  def block(self, ch):
+    if not self.level and ch == "}":
+      self.action(self.execute)
+      return self.start
+    else:
+      self.match(ch, "{", "}")
+      self.text += ch
+      return self.block
+
+  def expression(self, ch):
+    if not self.level and ch == ")":
+      self.action(self.evaluate)
+      return self.start
+    else:
+      self.match(ch, "(", ")")
+      self.text += ch
+      return self.expression