cpython/Doc/tools/sgmlconv/docfixer.py

839 lines
28 KiB
Python
Executable File

#! /usr/bin/env python
"""Perform massive transformations on a document tree created from the LaTeX
of the Python documentation, and dump the ESIS data for the transformed tree.
"""
__version__ = '$Revision$'
import errno
import esistools
import re
import string
import sys
import xml.dom.core
import xml.dom.esis_builder
class ConversionError(Exception):
pass
DEBUG_PARA_FIXER = 0
if DEBUG_PARA_FIXER:
def para_msg(s):
sys.stderr.write("*** %s\n" % s)
else:
def para_msg(s):
pass
# Workaround to deal with invalid documents (multiple root elements). This
# does not indicate a bug in the DOM implementation.
#
def get_documentElement(self):
docelem = None
for n in self._node.children:
if n.type == xml.dom.core.ELEMENT:
docelem = xml.dom.core.Element(n, self, self)
return docelem
xml.dom.core.Document.get_documentElement = get_documentElement
# Replace get_childNodes for the Document class; without this, children
# accessed from the Document object via .childNodes (no matter how many
# levels of access are used) will be given an ownerDocument of None.
#
def get_childNodes(self):
return xml.dom.core.NodeList(self._node.children, self, self)
xml.dom.core.Document.get_childNodes = get_childNodes
def get_first_element(doc, gi):
for n in doc.childNodes:
if n.nodeType == xml.dom.core.ELEMENT and n.tagName == gi:
return n
def extract_first_element(doc, gi):
node = get_first_element(doc, gi)
if node is not None:
doc.removeChild(node)
return node
def find_all_elements(doc, gi):
nodes = []
if doc.nodeType == xml.dom.core.ELEMENT and doc.tagName == gi:
nodes.append(doc)
for child in doc.childNodes:
if child.nodeType == xml.dom.core.ELEMENT:
if child.tagName == gi:
nodes.append(child)
for node in child.getElementsByTagName(gi):
nodes.append(node)
return nodes
def simplify(doc):
# Try to rationalize the document a bit, since these things are simply
# not valid SGML/XML documents as they stand, and need a little work.
documentclass = "document"
inputs = []
node = extract_first_element(doc, "documentclass")
if node is not None:
documentclass = node.getAttribute("classname")
node = extract_first_element(doc, "title")
if node is not None:
inputs.append(node)
# update the name of the root element
node = get_first_element(doc, "document")
if node is not None:
node._node.name = documentclass
while 1:
node = extract_first_element(doc, "input")
if node is None:
break
inputs.append(node)
if inputs:
docelem = doc.documentElement
inputs.reverse()
for node in inputs:
text = doc.createTextNode("\n")
docelem.insertBefore(text, docelem.firstChild)
docelem.insertBefore(node, text)
docelem.insertBefore(doc.createTextNode("\n"), docelem.firstChild)
while doc.firstChild.nodeType == xml.dom.core.TEXT:
doc.removeChild(doc.firstChild)
def cleanup_root_text(doc):
discards = []
skip = 0
for n in doc.childNodes:
prevskip = skip
skip = 0
if n.nodeType == xml.dom.core.TEXT and not prevskip:
discards.append(n)
elif n.nodeType == xml.dom.core.ELEMENT and n.tagName == "COMMENT":
skip = 1
for node in discards:
doc.removeChild(node)
DESCRIPTOR_ELEMENTS = (
"cfuncdesc", "cvardesc", "ctypedesc",
"classdesc", "memberdesc", "memberdescni", "methoddesc", "methoddescni",
"excdesc", "funcdesc", "funcdescni", "opcodedesc",
"datadesc", "datadescni",
)
def fixup_descriptors(doc):
for tagName in DESCRIPTOR_ELEMENTS:
nodes = find_all_elements(doc, tagName)
for node in nodes:
rewrite_descriptor(doc, node)
def rewrite_descriptor(doc, descriptor):
#
# Do these things:
# 1. Add an "index=noindex" attribute to the element if the tagName
# ends in 'ni', removing the 'ni' from the name.
# 2. Create a <signature> from the name attribute and <args>.
# 3. Create additional <signature>s from <*line{,ni}> elements,
# if found.
# 4. Move remaining child nodes to a <description> element.
# 5. Put it back together.
#
descname = descriptor.tagName
index = 1
if descname[-2:] == "ni":
descname = descname[:-2]
descriptor.setAttribute("index", "noindex")
descriptor._node.name = descname
index = 0
desctype = descname[:-4] # remove 'desc'
linename = desctype + "line"
if not index:
linename = linename + "ni"
# 2.
signature = doc.createElement("signature")
name = doc.createElement("name")
signature.appendChild(doc.createTextNode("\n "))
signature.appendChild(name)
name.appendChild(doc.createTextNode(descriptor.getAttribute("name")))
descriptor.removeAttribute("name")
if descriptor.attributes.has_key("var"):
variable = descriptor.getAttribute("var")
if variable:
args = doc.createElement("args")
args.appendChild(doc.createTextNode(variable))
signature.appendChild(doc.createTextNode("\n "))
signature.appendChild(args)
descriptor.removeAttribute("var")
newchildren = [signature]
children = descriptor.childNodes
pos = skip_leading_nodes(children, 0)
if pos < len(children):
child = children[pos]
if child.nodeType == xml.dom.core.ELEMENT and child.tagName == "args":
# create an <args> in <signature>:
args = doc.createElement("args")
argchildren = []
map(argchildren.append, child.childNodes)
for n in argchildren:
child.removeChild(n)
args.appendChild(n)
signature.appendChild(doc.createTextNode("\n "))
signature.appendChild(args)
signature.appendChild(doc.createTextNode("\n "))
# 3.
pos = skip_leading_nodes(children, pos + 1)
while pos < len(children) \
and children[pos].nodeType == xml.dom.core.ELEMENT \
and children[pos].tagName == linename:
# this is really a supplemental signature, create <signature>
sig = methodline_to_signature(doc, children[pos])
newchildren.append(sig)
pos = skip_leading_nodes(children, pos + 1)
# 4.
description = doc.createElement("description")
description.appendChild(doc.createTextNode("\n"))
newchildren.append(description)
move_children(descriptor, description, pos)
last = description.childNodes[-1]
if last.nodeType == xml.dom.core.TEXT:
last.data = string.rstrip(last.data) + "\n "
# 5.
# should have nothing but whitespace and signature lines in <descriptor>;
# discard them
while descriptor.childNodes:
descriptor.removeChild(descriptor.childNodes[0])
for node in newchildren:
descriptor.appendChild(doc.createTextNode("\n "))
descriptor.appendChild(node)
descriptor.appendChild(doc.createTextNode("\n"))
def methodline_to_signature(doc, methodline):
signature = doc.createElement("signature")
signature.appendChild(doc.createTextNode("\n "))
name = doc.createElement("name")
name.appendChild(doc.createTextNode(methodline.getAttribute("name")))
methodline.removeAttribute("name")
signature.appendChild(name)
if len(methodline.childNodes):
args = doc.createElement("args")
signature.appendChild(doc.createTextNode("\n "))
signature.appendChild(args)
move_children(methodline, args)
signature.appendChild(doc.createTextNode("\n "))
return signature
def move_children(origin, dest, start=0):
children = origin.childNodes
while start < len(children):
node = children[start]
origin.removeChild(node)
dest.appendChild(node)
def handle_appendix(doc):
# must be called after simplfy() if document is multi-rooted to begin with
docelem = doc.documentElement
toplevel = docelem.tagName == "manual" and "chapter" or "section"
appendices = 0
nodes = []
for node in docelem.childNodes:
if appendices:
nodes.append(node)
elif node.nodeType == xml.dom.core.ELEMENT:
appnodes = node.getElementsByTagName("appendix")
if appnodes:
appendices = 1
parent = appnodes[0].parentNode
parent.removeChild(appnodes[0])
parent.normalize()
if nodes:
map(docelem.removeChild, nodes)
docelem.appendChild(doc.createTextNode("\n\n\n"))
back = doc.createElement("back-matter")
docelem.appendChild(back)
back.appendChild(doc.createTextNode("\n"))
while nodes and nodes[0].nodeType == xml.dom.core.TEXT \
and not string.strip(nodes[0].data):
del nodes[0]
map(back.appendChild, nodes)
docelem.appendChild(doc.createTextNode("\n"))
def handle_labels(doc):
for label in find_all_elements(doc, "label"):
id = label.getAttribute("id")
if not id:
continue
parent = label.parentNode
if parent.tagName == "title":
parent.parentNode.setAttribute("id", id)
else:
parent.setAttribute("id", id)
# now, remove <label id="..."/> from parent:
parent.removeChild(label)
def fixup_trailing_whitespace(doc, wsmap):
queue = [doc]
while queue:
node = queue[0]
del queue[0]
if node.nodeType == xml.dom.core.ELEMENT \
and wsmap.has_key(node.tagName):
ws = wsmap[node.tagName]
children = node.childNodes
children.reverse()
if children[0].nodeType == xml.dom.core.TEXT:
data = string.rstrip(children[0].data) + ws
children[0].data = data
children.reverse()
# hack to get the title in place:
if node.tagName == "title" \
and node.parentNode.firstChild.nodeType == xml.dom.core.ELEMENT:
node.parentNode.insertBefore(doc.createText("\n "),
node.parentNode.firstChild)
for child in node.childNodes:
if child.nodeType == xml.dom.core.ELEMENT:
queue.append(child)
def normalize(doc):
for node in doc.childNodes:
if node.nodeType == xml.dom.core.ELEMENT:
node.normalize()
def cleanup_trailing_parens(doc, element_names):
d = {}
for gi in element_names:
d[gi] = gi
rewrite_element = d.has_key
queue = []
for node in doc.childNodes:
if node.nodeType == xml.dom.core.ELEMENT:
queue.append(node)
while queue:
node = queue[0]
del queue[0]
if rewrite_element(node.tagName):
children = node.childNodes
if len(children) == 1 \
and children[0].nodeType == xml.dom.core.TEXT:
data = children[0].data
if data[-2:] == "()":
children[0].data = data[:-2]
else:
for child in node.childNodes:
if child.nodeType == xml.dom.core.ELEMENT:
queue.append(child)
def contents_match(left, right):
left_children = left.childNodes
right_children = right.childNodes
if len(left_children) != len(right_children):
return 0
for l, r in map(None, left_children, right_children):
nodeType = l.nodeType
if nodeType != r.nodeType:
return 0
if nodeType == xml.dom.core.ELEMENT:
if l.tagName != r.tagName:
return 0
# should check attributes, but that's not a problem here
if not contents_match(l, r):
return 0
elif nodeType == xml.dom.core.TEXT:
if l.data != r.data:
return 0
else:
# not quite right, but good enough
return 0
return 1
def create_module_info(doc, section):
# Heavy.
node = extract_first_element(section, "modulesynopsis")
if node is None:
return
node._node.name = "synopsis"
lastchild = node.childNodes[-1]
if lastchild.nodeType == xml.dom.core.TEXT \
and lastchild.data[-1:] == ".":
lastchild.data = lastchild.data[:-1]
modauthor = extract_first_element(section, "moduleauthor")
if modauthor:
modauthor._node.name = "author"
modauthor.appendChild(doc.createTextNode(
modauthor.getAttribute("name")))
modauthor.removeAttribute("name")
if section.tagName == "section":
modinfo_pos = 2
modinfo = doc.createElement("moduleinfo")
moddecl = extract_first_element(section, "declaremodule")
name = None
if moddecl:
modinfo.appendChild(doc.createTextNode("\n "))
name = moddecl.attributes["name"].value
namenode = doc.createElement("name")
namenode.appendChild(doc.createTextNode(name))
modinfo.appendChild(namenode)
type = moddecl.attributes.get("type")
if type:
type = type.value
modinfo.appendChild(doc.createTextNode("\n "))
typenode = doc.createElement("type")
typenode.appendChild(doc.createTextNode(type))
modinfo.appendChild(typenode)
title = get_first_element(section, "title")
if title:
children = title.childNodes
if len(children) >= 2 \
and children[0].nodeType == xml.dom.core.ELEMENT \
and children[0].tagName == "module" \
and children[0].childNodes[0].data == name:
# this is it; morph the <title> into <short-synopsis>
first_data = children[1]
if first_data.data[:4] == " ---":
first_data.data = string.lstrip(first_data.data[4:])
title._node.name = "short-synopsis"
if children[-1].nodeType == xml.dom.core.TEXT \
and children[-1].data[-1:] == ".":
children[-1].data = children[-1].data[:-1]
section.removeChild(title)
section.removeChild(section.childNodes[0])
title.removeChild(children[0])
modinfo_pos = 0
else:
sys.stderr.write(
"module name in title doesn't match"
" <declaremodule>; no <short-synopsis>\n")
else:
sys.stderr.write(
"Unexpected condition: <section> without <title>\n")
modinfo.appendChild(doc.createTextNode("\n "))
modinfo.appendChild(node)
if title and not contents_match(title, node):
# The short synopsis is actually different,
# and needs to be stored:
modinfo.appendChild(doc.createTextNode("\n "))
modinfo.appendChild(title)
if modauthor:
modinfo.appendChild(doc.createTextNode("\n "))
modinfo.appendChild(modauthor)
modinfo.appendChild(doc.createTextNode("\n "))
section.insertBefore(modinfo, section.childNodes[modinfo_pos])
section.insertBefore(doc.createTextNode("\n "), modinfo)
def cleanup_synopses(doc):
for node in find_all_elements(doc, "section"):
create_module_info(doc, node)
def remap_element_names(root, name_map):
queue = []
for child in root.childNodes:
if child.nodeType == xml.dom.core.ELEMENT:
queue.append(child)
while queue:
node = queue.pop()
tagName = node.tagName
if name_map.has_key(tagName):
name, attrs = name_map[tagName]
node._node.name = name
for attr, value in attrs.items():
node.setAttribute(attr, value)
for child in node.childNodes:
if child.nodeType == xml.dom.core.ELEMENT:
queue.append(child)
def fixup_table_structures(doc):
# must be done after remap_element_names(), or the tables won't be found
for table in find_all_elements(doc, "table"):
fixup_table(doc, table)
def fixup_table(doc, table):
# create the table head
thead = doc.createElement("thead")
row = doc.createElement("row")
move_elements_by_name(doc, table, row, "entry")
thead.appendChild(doc.createTextNode("\n "))
thead.appendChild(row)
thead.appendChild(doc.createTextNode("\n "))
# create the table body
tbody = doc.createElement("tbody")
prev_row = None
last_was_hline = 0
children = table.childNodes
for child in children:
if child.nodeType == xml.dom.core.ELEMENT:
tagName = child.tagName
if tagName == "hline" and prev_row is not None:
prev_row.setAttribute("rowsep", "1")
elif tagName == "row":
prev_row = child
# save the rows:
tbody.appendChild(doc.createTextNode("\n "))
move_elements_by_name(doc, table, tbody, "row", sep="\n ")
# and toss the rest:
while children:
child = children[0]
nodeType = child.nodeType
if nodeType == xml.dom.core.TEXT:
if string.strip(child.data):
raise ConversionError("unexpected free data in table")
table.removeChild(child)
continue
if nodeType == xml.dom.core.ELEMENT:
if child.tagName != "hline":
raise ConversionError(
"unexpected <%s> in table" % child.tagName)
table.removeChild(child)
continue
raise ConversionError(
"unexpected %s node in table" % child.__class__.__name__)
# nothing left in the <table>; add the <thead> and <tbody>
tgroup = doc.createElement("tgroup")
tgroup.appendChild(doc.createTextNode("\n "))
tgroup.appendChild(thead)
tgroup.appendChild(doc.createTextNode("\n "))
tgroup.appendChild(tbody)
tgroup.appendChild(doc.createTextNode("\n "))
table.appendChild(tgroup)
# now make the <entry>s look nice:
for row in table.getElementsByTagName("row"):
fixup_row(doc, row)
def fixup_row(doc, row):
entries = []
map(entries.append, row.childNodes[1:])
for entry in entries:
row.insertBefore(doc.createTextNode("\n "), entry)
# row.appendChild(doc.createTextNode("\n "))
def move_elements_by_name(doc, source, dest, name, sep=None):
nodes = []
for child in source.childNodes:
if child.nodeType == xml.dom.core.ELEMENT and child.tagName == name:
nodes.append(child)
for node in nodes:
source.removeChild(node)
dest.appendChild(node)
if sep:
dest.appendChild(doc.createTextNode(sep))
RECURSE_INTO_PARA_CONTAINERS = (
"chapter", "abstract", "enumerate",
"section", "subsection", "subsubsection",
"paragraph", "subparagraph",
"howto", "manual",
)
PARA_LEVEL_ELEMENTS = (
"moduleinfo", "title", "verbatim", "enumerate", "item",
"opcodedesc", "classdesc", "datadesc",
"funcdesc", "methoddesc", "excdesc",
"funcdescni", "methoddescni", "excdescni",
"tableii", "tableiii", "tableiv", "localmoduletable",
"sectionauthor", "seealso",
# include <para>, so we can just do it again to get subsequent paras:
"para",
)
PARA_LEVEL_PRECEEDERS = (
"index", "indexii", "indexiii", "indexiv", "setindexsubitem",
"stindex", "obindex", "COMMENT", "label", "input", "title",
)
def fixup_paras(doc):
for child in doc.childNodes:
if child.nodeType == xml.dom.core.ELEMENT \
and child.tagName in RECURSE_INTO_PARA_CONTAINERS:
#
fixup_paras_helper(doc, child)
descriptions = find_all_elements(doc, "description")
for description in descriptions:
fixup_paras_helper(doc, description)
def fixup_paras_helper(doc, container, depth=0):
# document is already normalized
children = container.childNodes
start = 0
while len(children) > start:
start = skip_leading_nodes(children, start)
if start >= len(children):
break
#
# Either paragraph material or something to recurse into:
#
if (children[start].nodeType == xml.dom.core.ELEMENT) \
and (children[start].tagName in RECURSE_INTO_PARA_CONTAINERS):
fixup_paras_helper(doc, children[start])
start = skip_leading_nodes(children, start + 1)
continue
#
# paragraph material:
#
build_para(doc, container, start, len(children))
if DEBUG_PARA_FIXER and depth == 10:
sys.exit(1)
start = start + 1
def build_para(doc, parent, start, i):
children = parent.childNodes
after = start + 1
have_last = 0
BREAK_ELEMENTS = PARA_LEVEL_ELEMENTS + RECURSE_INTO_PARA_CONTAINERS
# Collect all children until \n\n+ is found in a text node or a
# member of BREAK_ELEMENTS is found.
for j in range(start, i):
after = j + 1
child = children[j]
nodeType = child.nodeType
if nodeType == xml.dom.core.ELEMENT:
if child.tagName in BREAK_ELEMENTS:
after = j
break
elif nodeType == xml.dom.core.TEXT:
pos = string.find(child.data, "\n\n")
if pos == 0:
after = j
break
if pos >= 1:
child.splitText(pos)
break
else:
have_last = 1
if (start + 1) > after:
raise ConversionError(
"build_para() could not identify content to turn into a paragraph")
if children[after - 1].nodeType == xml.dom.core.TEXT:
# we may need to split off trailing white space:
child = children[after - 1]
data = child.data
if string.rstrip(data) != data:
have_last = 0
child.splitText(len(string.rstrip(data)))
para = doc.createElement("para")
prev = None
indexes = range(start, after)
indexes.reverse()
for j in indexes:
node = parent.childNodes[j]
parent.removeChild(node)
para.insertBefore(node, prev)
prev = node
if have_last:
parent.appendChild(para)
return len(parent.childNodes)
else:
parent.insertBefore(para, parent.childNodes[start])
return start + 1
def skip_leading_nodes(children, start):
"""Return index into children of a node at which paragraph building should
begin or a recursive call to fixup_paras_helper() should be made (for
subsections, etc.).
When the return value >= len(children), we've built all the paras we can
from this list of children.
"""
i = len(children)
while i > start:
# skip over leading comments and whitespace:
child = children[start]
nodeType = child.nodeType
if nodeType == xml.dom.core.TEXT:
data = child.data
shortened = string.lstrip(data)
if shortened:
if data != shortened:
# break into two nodes: whitespace and non-whitespace
child.splitText(len(data) - len(shortened))
return start + 1
return start
# all whitespace, just skip
elif nodeType == xml.dom.core.ELEMENT:
tagName = child.tagName
if tagName in RECURSE_INTO_PARA_CONTAINERS:
return start
if tagName not in PARA_LEVEL_ELEMENTS + PARA_LEVEL_PRECEEDERS:
return start
start = start + 1
return start
def fixup_rfc_references(doc):
for rfcnode in find_all_elements(doc, "rfc"):
rfcnode.appendChild(doc.createTextNode(
"RFC " + rfcnode.getAttribute("num")))
def fixup_signatures(doc):
for child in doc.childNodes:
if child.nodeType == xml.dom.core.ELEMENT:
args = child.getElementsByTagName("args")
for arg in args:
fixup_args(doc, arg)
arg.normalize()
args = child.getElementsByTagName("constructor-args")
for arg in args:
fixup_args(doc, arg)
arg.normalize()
def fixup_args(doc, arglist):
for child in arglist.childNodes:
if child.nodeType == xml.dom.core.ELEMENT \
and child.tagName == "optional":
# found it; fix and return
arglist.insertBefore(doc.createTextNode("["), child)
optkids = child.childNodes
while optkids:
k = optkids[0]
child.removeChild(k)
arglist.insertBefore(k, child)
arglist.insertBefore(doc.createTextNode("]"), child)
arglist.removeChild(child)
return fixup_args(doc, arglist)
def fixup_sectionauthors(doc):
for sectauth in find_all_elements(doc, "sectionauthor"):
section = sectauth.parentNode
section.removeChild(sectauth)
sectauth._node.name = "author"
sectauth.appendChild(doc.createTextNode(
sectauth.getAttribute("name")))
sectauth.removeAttribute("name")
after = section.childNodes[2]
title = section.childNodes[1]
if title.nodeType == xml.dom.core.ELEMENT and title.tagName != "title":
after = section.childNodes[0]
section.insertBefore(doc.createTextNode("\n "), after)
section.insertBefore(sectauth, after)
_token_rx = re.compile(r"[a-zA-Z][a-zA-Z0-9.-]*$")
def write_esis(doc, ofp, knownempty):
for node in doc.childNodes:
nodeType = node.nodeType
if nodeType == xml.dom.core.ELEMENT:
gi = node.tagName
if knownempty(gi):
if node.hasChildNodes():
raise ValueError, "declared-empty node has children"
ofp.write("e\n")
for k, v in node.attributes.items():
value = v.value
if _token_rx.match(value):
dtype = "TOKEN"
else:
dtype = "CDATA"
ofp.write("A%s %s %s\n" % (k, dtype, esistools.encode(value)))
ofp.write("(%s\n" % gi)
write_esis(node, ofp, knownempty)
ofp.write(")%s\n" % gi)
elif nodeType == xml.dom.core.TEXT:
ofp.write("-%s\n" % esistools.encode(node.data))
else:
raise RuntimeError, "unsupported node type: %s" % nodeType
def convert(ifp, ofp):
p = esistools.ExtendedEsisBuilder()
p.feed(ifp.read())
doc = p.document
normalize(doc)
simplify(doc)
handle_labels(doc)
handle_appendix(doc)
fixup_trailing_whitespace(doc, {
"abstract": "\n",
"title": "",
"chapter": "\n\n",
"section": "\n\n",
"subsection": "\n\n",
"subsubsection": "\n\n",
"paragraph": "\n\n",
"subparagraph": "\n\n",
})
cleanup_root_text(doc)
cleanup_trailing_parens(doc, ["function", "method", "cfunction"])
cleanup_synopses(doc)
fixup_descriptors(doc)
normalize(doc)
fixup_paras(doc)
fixup_sectionauthors(doc)
remap_element_names(doc, {
"tableii": ("table", {"cols": "2"}),
"tableiii": ("table", {"cols": "3"}),
"tableiv": ("table", {"cols": "4"}),
"lineii": ("row", {}),
"lineiii": ("row", {}),
"lineiv": ("row", {}),
"refmodule": ("module", {"link": "link"}),
})
fixup_table_structures(doc)
fixup_rfc_references(doc)
fixup_signatures(doc)
#
d = {}
for gi in p.get_empties():
d[gi] = gi
if d.has_key("rfc"):
del d["rfc"]
knownempty = d.has_key
#
try:
write_esis(doc, ofp, knownempty)
except IOError, (err, msg):
# Ignore EPIPE; it just means that whoever we're writing to stopped
# reading. The rest of the output would be ignored. All other errors
# should still be reported,
if err != errno.EPIPE:
raise
def main():
if len(sys.argv) == 1:
ifp = sys.stdin
ofp = sys.stdout
elif len(sys.argv) == 2:
ifp = open(sys.argv[1])
ofp = sys.stdout
elif len(sys.argv) == 3:
ifp = open(sys.argv[1])
ofp = open(sys.argv[2], "w")
else:
usage()
sys.exit(2)
convert(ifp, ofp)
if __name__ == "__main__":
main()