#!/usr/bin/env python

#
# 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.
#

#
# Convert rules to tests
#
import sys, re, os.path
from getopt import getopt, GetoptError
from string import capitalize
from xml import dom
from xml.dom.minidom import parse

def camelcase(s):
    """Convert 'string like this' to 'StringLikeThis'"""
    return "".join([capitalize(w) for w in re.split(re.compile("\W*"), s)])

def uncapitalize(s): return s[0].lower()+s[1:]

def ancestors(node):
    "Return iterator of ancestors from top-level element to node"
    def generator(node):
        while node and node.parentNode:
            yield node
            node = node.parentNode
    return reversed(list(generator(node)))

def tagAndName(element):
    nameAttr = element.getAttribute("name");
    if (nameAttr) : return  camelcase(nameAttr) + camelcase(element.tagName)
    else: return camelcase(element.tagName)

def nodeText(n):
    """Recursively collect text from all text nodes under n"""
    if n.nodeType == dom.Node.TEXT_NODE:
        return n.data
    if n.childNodes:
        return reduce(lambda t, c: t + nodeText(c),  n.childNodes, "")
    return ""

def cleanup(docString, level=8):
    unindent = re.sub("\n[ \t]*", "\n", docString.strip())
    emptyLines = re.sub("\n\n\n", "\n\n", unindent)
    indented = re.sub("\n", "\n"+level*" ", emptyLines)
    return level*" " + indented

def printTest(test, docstring):
    print "class %s(TestBase):" % test
    print '    """'
    print docstring
    print '    """'
    print
    print
    
def printTests(doc, module):
    """Returns dictionary { classname : [ (methodname, docstring)* ] * }"""
    tests = {}
    rules = doc.getElementsByTagName("rule")
    for r in rules:
        path = list(ancestors(r))
        if module == path[1].getAttribute("name").lower():
            test = "".join(map(tagAndName, path[2:])) + "Tests"
            docstring = cleanup(nodeText(r), 4)
            printTest(test, docstring)

def usage(message=None):
    if message: print >>sys.stderr, message
    print >>sys.stderr, """
rule2test [options] <amqpclass>

Print test classes for each rule for the amqpclass in amqp.xml.

Options:
  -?/-h/--help : this message
  -s/--spec <spec.xml> : file containing amqp XML spec 
"""
    return 1

def main(argv):
    try: opts, args = getopt(argv[1:], "h?s:", ["help", "spec="])
    except GetoptError, e: return usage(e)
    spec = "../specs/amqp.xml"          # Default
    for opt, val in opts:
        if (opt in ("-h", "-?", "--help")): return usage()
        if (opt in ("-s", "--spec")): spec = val
    doc = parse(spec)
    if len(args) == 0: return usage()
    printTests(doc, args[0])
    return 0

if (__name__ == "__main__"): sys.exit(main(sys.argv))