ref: e2ee991490227698bbc3f9ace4c9ecc014d12dbe
dir: /sys/lib/python/plat-irix6/flp.py/
#
# flp - Module to load fl forms from fd files
#
# Jack Jansen, December 1991
#
import os
import sys
import FL
SPLITLINE = '--------------------'
FORMLINE = '=============== FORM ==============='
ENDLINE = '=============================='
class error(Exception):
pass
##################################################################
# Part 1 - The parsing routines #
##################################################################
#
# Externally visible function. Load form.
#
def parse_form(filename, formname):
forms = checkcache(filename)
if forms is None:
forms = parse_forms(filename)
if forms.has_key(formname):
return forms[formname]
else:
raise error, 'No such form in fd file'
#
# Externally visible function. Load all forms.
#
def parse_forms(filename):
forms = checkcache(filename)
if forms is not None: return forms
fp = _open_formfile(filename)
nforms = _parse_fd_header(fp)
forms = {}
for i in range(nforms):
form = _parse_fd_form(fp, None)
forms[form[0].Name] = form
writecache(filename, forms)
return forms
#
# Internal: see if a cached version of the file exists
#
MAGIC = '.fdc'
_internal_cache = {} # Used by frozen scripts only
def checkcache(filename):
if _internal_cache.has_key(filename):
altforms = _internal_cache[filename]
return _unpack_cache(altforms)
import marshal
fp, filename = _open_formfile2(filename)
fp.close()
cachename = filename + 'c'
try:
fp = open(cachename, 'r')
except IOError:
#print 'flp: no cache file', cachename
return None
try:
if fp.read(4) != MAGIC:
print 'flp: bad magic word in cache file', cachename
return None
cache_mtime = rdlong(fp)
file_mtime = getmtime(filename)
if cache_mtime != file_mtime:
#print 'flp: outdated cache file', cachename
return None
#print 'flp: valid cache file', cachename
altforms = marshal.load(fp)
return _unpack_cache(altforms)
finally:
fp.close()
def _unpack_cache(altforms):
forms = {}
for name in altforms.keys():
altobj, altlist = altforms[name]
obj = _newobj()
obj.make(altobj)
list = []
for altobj in altlist:
nobj = _newobj()
nobj.make(altobj)
list.append(nobj)
forms[name] = obj, list
return forms
def rdlong(fp):
s = fp.read(4)
if len(s) != 4: return None
a, b, c, d = s[0], s[1], s[2], s[3]
return ord(a)<<24 | ord(b)<<16 | ord(c)<<8 | ord(d)
def wrlong(fp, x):
a, b, c, d = (x>>24)&0xff, (x>>16)&0xff, (x>>8)&0xff, x&0xff
fp.write(chr(a) + chr(b) + chr(c) + chr(d))
def getmtime(filename):
import os
from stat import ST_MTIME
try:
return os.stat(filename)[ST_MTIME]
except os.error:
return None
#
# Internal: write cached version of the form (parsing is too slow!)
#
def writecache(filename, forms):
import marshal
fp, filename = _open_formfile2(filename)
fp.close()
cachename = filename + 'c'
try:
fp = open(cachename, 'w')
except IOError:
print 'flp: can\'t create cache file', cachename
return # Never mind
fp.write('\0\0\0\0') # Seek back and write MAGIC when done
wrlong(fp, getmtime(filename))
altforms = _pack_cache(forms)
marshal.dump(altforms, fp)
fp.seek(0)
fp.write(MAGIC)
fp.close()
#print 'flp: wrote cache file', cachename
#
# External: print some statements that set up the internal cache.
# This is for use with the "freeze" script. You should call
# flp.freeze(filename) for all forms used by the script, and collect
# the output on a file in a module file named "frozenforms.py". Then
# in the main program of the script import frozenforms.
# (Don't forget to take this out when using the unfrozen version of
# the script!)
#
def freeze(filename):
forms = parse_forms(filename)
altforms = _pack_cache(forms)
print 'import flp'
print 'flp._internal_cache[', repr(filename), '] =', altforms
#
# Internal: create the data structure to be placed in the cache
#
def _pack_cache(forms):
altforms = {}
for name in forms.keys():
obj, list = forms[name]
altobj = obj.__dict__
altlist = []
for obj in list: altlist.append(obj.__dict__)
altforms[name] = altobj, altlist
return altforms
#
# Internal: Locate form file (using PYTHONPATH) and open file
#
def _open_formfile(filename):
return _open_formfile2(filename)[0]
def _open_formfile2(filename):
if filename[-3:] != '.fd':
filename = filename + '.fd'
if filename[0] == '/':
try:
fp = open(filename,'r')
except IOError:
fp = None
else:
for pc in sys.path:
pn = os.path.join(pc, filename)
try:
fp = open(pn, 'r')
filename = pn
break
except IOError:
fp = None
if fp is None:
raise error, 'Cannot find forms file ' + filename
return fp, filename
#
# Internal: parse the fd file header, return number of forms
#
def _parse_fd_header(file):
# First read the magic header line
datum = _parse_1_line(file)
if datum != ('Magic', 12321):
raise error, 'Not a forms definition file'
# Now skip until we know number of forms
while 1:
datum = _parse_1_line(file)
if type(datum) == type(()) and datum[0] == 'Numberofforms':
break
return datum[1]
#
# Internal: parse fd form, or skip if name doesn't match.
# the special value None means 'always parse it'.
#
def _parse_fd_form(file, name):
datum = _parse_1_line(file)
if datum != FORMLINE:
raise error, 'Missing === FORM === line'
form = _parse_object(file)
if form.Name == name or name is None:
objs = []
for j in range(form.Numberofobjects):
obj = _parse_object(file)
objs.append(obj)
return (form, objs)
else:
for j in range(form.Numberofobjects):
_skip_object(file)
return None
#
# Internal class: a convenient place to store object info fields
#
class _newobj:
def add(self, name, value):
self.__dict__[name] = value
def make(self, dict):
for name in dict.keys():
self.add(name, dict[name])
#
# Internal parsing routines.
#
def _parse_string(str):
if '\\' in str:
s = '\'' + str + '\''
try:
return eval(s)
except:
pass
return str
def _parse_num(str):
return eval(str)
def _parse_numlist(str):
slist = str.split()
nlist = []
for i in slist:
nlist.append(_parse_num(i))
return nlist
# This dictionary maps item names to parsing routines.
# If no routine is given '_parse_num' is default.
_parse_func = { \
'Name': _parse_string, \
'Box': _parse_numlist, \
'Colors': _parse_numlist, \
'Label': _parse_string, \
'Name': _parse_string, \
'Callback': _parse_string, \
'Argument': _parse_string }
# This function parses a line, and returns either
# a string or a tuple (name,value)
import re
prog = re.compile('^([^:]*): *(.*)')
def _parse_line(line):
match = prog.match(line)
if not match:
return line
name, value = match.group(1, 2)
if name[0] == 'N':
name = ''.join(name.split())
name = name.lower()
name = name.capitalize()
try:
pf = _parse_func[name]
except KeyError:
pf = _parse_num
value = pf(value)
return (name, value)
def _readline(file):
line = file.readline()
if not line:
raise EOFError
return line[:-1]
def _parse_1_line(file):
line = _readline(file)
while line == '':
line = _readline(file)
return _parse_line(line)
def _skip_object(file):
line = ''
while not line in (SPLITLINE, FORMLINE, ENDLINE):
pos = file.tell()
line = _readline(file)
if line == FORMLINE:
file.seek(pos)
def _parse_object(file):
obj = _newobj()
while 1:
pos = file.tell()
datum = _parse_1_line(file)
if datum in (SPLITLINE, FORMLINE, ENDLINE):
if datum == FORMLINE:
file.seek(pos)
return obj
if type(datum) is not type(()) or len(datum) != 2:
raise error, 'Parse error, illegal line in object: '+datum
obj.add(datum[0], datum[1])
#################################################################
# Part 2 - High-level object/form creation routines #
#################################################################
#
# External - Create a form an link to an instance variable.
#
def create_full_form(inst, (fdata, odatalist)):
form = create_form(fdata)
exec 'inst.'+fdata.Name+' = form\n'
for odata in odatalist:
create_object_instance(inst, form, odata)
#
# External - Merge a form into an existing form in an instance
# variable.
#
def merge_full_form(inst, form, (fdata, odatalist)):
exec 'inst.'+fdata.Name+' = form\n'
if odatalist[0].Class != FL.BOX:
raise error, 'merge_full_form() expects FL.BOX as first obj'
for odata in odatalist[1:]:
create_object_instance(inst, form, odata)
#################################################################
# Part 3 - Low-level object/form creation routines #
#################################################################
#
# External Create_form - Create form from parameters
#
def create_form(fdata):
import fl
return fl.make_form(FL.NO_BOX, fdata.Width, fdata.Height)
#
# External create_object - Create an object. Make sure there are
# no callbacks. Returns the object created.
#
def create_object(form, odata):
obj = _create_object(form, odata)
if odata.Callback:
raise error, 'Creating free object with callback'
return obj
#
# External create_object_instance - Create object in an instance.
#
def create_object_instance(inst, form, odata):
obj = _create_object(form, odata)
if odata.Callback:
cbfunc = eval('inst.'+odata.Callback)
obj.set_call_back(cbfunc, odata.Argument)
if odata.Name:
exec 'inst.' + odata.Name + ' = obj\n'
#
# Internal _create_object: Create the object and fill options
#
def _create_object(form, odata):
crfunc = _select_crfunc(form, odata.Class)
obj = crfunc(odata.Type, odata.Box[0], odata.Box[1], odata.Box[2], \
odata.Box[3], odata.Label)
if not odata.Class in (FL.BEGIN_GROUP, FL.END_GROUP):
obj.boxtype = odata.Boxtype
obj.col1 = odata.Colors[0]
obj.col2 = odata.Colors[1]
obj.align = odata.Alignment
obj.lstyle = odata.Style
obj.lsize = odata.Size
obj.lcol = odata.Lcol
return obj
#
# Internal crfunc: helper function that returns correct create function
#
def _select_crfunc(fm, cl):
if cl == FL.BEGIN_GROUP: return fm.bgn_group
elif cl == FL.END_GROUP: return fm.end_group
elif cl == FL.BITMAP: return fm.add_bitmap
elif cl == FL.BOX: return fm.add_box
elif cl == FL.BROWSER: return fm.add_browser
elif cl == FL.BUTTON: return fm.add_button
elif cl == FL.CHART: return fm.add_chart
elif cl == FL.CHOICE: return fm.add_choice
elif cl == FL.CLOCK: return fm.add_clock
elif cl == FL.COUNTER: return fm.add_counter
elif cl == FL.DIAL: return fm.add_dial
elif cl == FL.FREE: return fm.add_free
elif cl == FL.INPUT: return fm.add_input
elif cl == FL.LIGHTBUTTON: return fm.add_lightbutton
elif cl == FL.MENU: return fm.add_menu
elif cl == FL.POSITIONER: return fm.add_positioner
elif cl == FL.ROUNDBUTTON: return fm.add_roundbutton
elif cl == FL.SLIDER: return fm.add_slider
elif cl == FL.VALSLIDER: return fm.add_valslider
elif cl == FL.TEXT: return fm.add_text
elif cl == FL.TIMER: return fm.add_timer
else:
raise error, 'Unknown object type: %r' % (cl,)
def test():
import time
t0 = time.time()
if len(sys.argv) == 2:
forms = parse_forms(sys.argv[1])
t1 = time.time()
print 'parse time:', 0.001*(t1-t0), 'sec.'
keys = forms.keys()
keys.sort()
for i in keys:
_printform(forms[i])
elif len(sys.argv) == 3:
form = parse_form(sys.argv[1], sys.argv[2])
t1 = time.time()
print 'parse time:', round(t1-t0, 3), 'sec.'
_printform(form)
else:
print 'Usage: test fdfile [form]'
def _printform(form):
f = form[0]
objs = form[1]
print 'Form ', f.Name, ', size: ', f.Width, f.Height, ' Nobj ', f.Numberofobjects
for i in objs:
print ' Obj ', i.Name, ' type ', i.Class, i.Type
print ' Box ', i.Box, ' btype ', i.Boxtype
print ' Label ', i.Label, ' size/style/col/align ', i.Size,i.Style, i.Lcol, i.Alignment
print ' cols ', i.Colors
print ' cback ', i.Callback, i.Argument