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"""An attempt at an unweave script.
Jack Jansen, jack@oratrix.com, 13-Dec-00
"""
import re
import sys
import macfs
import os
BEGINDEFINITION=re.compile("^<<(?P<name>.*)>>=\s*")
USEDEFINITION=re.compile("^(?P<pre>.*)<<(?P<name>.*)>>[^=]")
ENDDEFINITION=re.compile("^@")
class Processor:
def __init__(self, filename):
self.items = {}
self.filename = filename
self.fp = open(filename)
self.lineno = 0
self.resolving = {}
self.resolved = {}
self.pushback = None
def _readline(self):
"""Read a line. Allow for pushback"""
if self.pushback:
rv = self.pushback
self.pushback = None
return rv
self.lineno = self.lineno + 1
return self.fp.readline()
def _linedirective(self):
"""Return a #line cpp directive for the current input file position"""
return '#line %d "%s"\n'%(self.lineno-2, os.path.split(self.filename)[1])
def _readitem(self):
"""Read the definition of an item. Insert #line where needed. """
rv = [self._linedirective()]
while 1:
line = self._readline()
if not line:
break
if ENDDEFINITION.search(line):
break
if BEGINDEFINITION.match(line):
self.pushback = line
break
mo = USEDEFINITION.match(line)
if mo:
pre = mo.group('pre')
if pre:
rv.append(pre+'\n')
rv.append(line)
# For simplicity we add #line directives now, if
# needed.
if mo:
rv.append(self._linedirective())
return rv
def _define(self, name, value):
"""Define an item, or append to an existing definition"""
if self.items.has_key(name):
self.items[name] = self.items[name] + value
else:
self.items[name] = value
def read(self):
"""Read the source file and store all definitions"""
while 1:
line = self._readline()
if not line: break
mo = BEGINDEFINITION.search(line)
if mo:
name = mo.group('name')
value = self._readitem()
self._define(name, value)
else:
pass # We could output the TeX code but we don't bother.
def resolve(self):
"""Resolve all references"""
for name in self.items.keys():
self._resolve_one(name)
def _resolve_one(self, name):
"""Resolve references in one definition, recursively"""
# First check for unknown macros and recursive calls
if not self.items.has_key(name):
print "Undefined macro:", name
return ['<<%s>>'%name]
if self.resolving.has_key(name):
print "Recursive macro:", name
return ['<<%s>>'%name]
# Then check that we haven't handled this one before
if self.resolved.has_key(name):
return self.items[name]
# No rest for the wicked: we have work to do.
self.resolving[name] = 1
result = []
for line in self.items[name]:
mo = USEDEFINITION.search(line)
if mo:
# We replace the complete line. Is this correct?
macro = mo.group('name')
replacement = self._resolve_one(macro)
result = result + replacement
else:
result.append(line)
self.items[name] = result
self.resolved[name] = 1
del self.resolving[name]
return result
def save(self, dir, pattern):
"""Save macros that match pattern to folder dir"""
# Compile the pattern, if needed
if type(pattern) == type(''):
pattern = re.compile(pattern)
# If the directory is relative it is relative to the sourcefile
if not os.path.isabs(dir):
sourcedir = os.path.split(self.filename)[0]
dir = os.path.join(sourcedir, dir)
for name in self.items.keys():
if pattern.search(name):
pathname = os.path.join(dir, name)
data = self._stripduplines(self.items[name])
self._dosave(pathname, data)
def _stripduplines(self, data):
for i in range(len(data)-1, 0, -1):
if data[i][:5] == '#line' and data[i-1][:5] == '#line':
del data[i-1]
if data[-1][:5] == '#line':
del data[-1]
return data
def _dosave(self, pathname, data):
"""Save data to pathname, unless it is identical to what is there"""
if os.path.exists(pathname):
olddata = open(pathname).readlines()
if olddata == data:
return
fp = open(pathname, "w").writelines(data)
def process(file):
pr = Processor(file)
pr.read()
pr.resolve()
pr.save(":jacktest:src", "^.*\.cp$")
pr.save(":jacktest:include", "^.*\.h")
def main():
if len(sys.argv) > 1:
for file in sys.argv:
print "Processing", file
process(file)
else:
fss, ok = macfs.PromptGetFile("Select .nw source file", "TEXT")
if not ok:
sys.exit(0)
process(fss.as_pathname())
if __name__ == "__main__":
main()
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