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# func.py
"""
This module is an integeral part of the program
MMA - Musical Midi Accompaniment.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Bob van der Poel <bob@mellowood.ca>
Code for Defaults and recursion stack Ignazio Di Napoli.
Define and execute simple function / subroutine calls.
"""
import copy
from . import gbl
import MMA.file
from MMA.macro import macros
from MMA.common import *
import MMA.debug
# Storage for our functions
class Funcs:
def __init__(self, params, body, defaults, fname, lineN):
self.params = params
self.body = body
self.defaults = defaults
self.lineN = lineN
self.fname = fname
funcList = {}
########################
def defCall(l):
""" Define a function. """
if len(l) < 1:
error("DefCall: At least one argument (name) is needed.")
lineN = gbl.lineno
# Grab 1st arg. This is the function name
fname = l[0].strip().upper()
if '$' in fname:
error("DefCall: '$' is not permitted in function name.")
# The params are split into words. Join together just so we can
# take it apart again. Needed to use ',' delimiters
# read from the inside out: replace '\,' with chr(255)
# join together with space delims (skip func name)
# split up at ','
p = ' '.join(l[1:]).replace('\,', chr(255)).split(',')
# Convert the param names so they have a leading '$'. The '$'
# is not permitted in a param name.
params = []
defaults = []
for a in p:
a = a.strip().replace(chr(255), ",")
if not a:
continue
if '=' in a:
a,d = a.split('=')
a = a.strip()
d = d.strip()
else:
d = None
if '$' in a:
error("DefCall: '$' is not permitted in paramater name.")
a = '$'+a
if a in params:
error("DefCall: '%s' is a duplicate paramater name." % a)
params.append(a.upper())
defaults.append(d)
body = []
while 1:
ln = gbl.inpath.read()
if not ln:
error("DefCall: Reached EOF while looking for EndDefCall.")
cmd = ln[0].upper()
if cmd in ("DEFCALLEND", "ENDDEFCALL"):
if len(ln) > 1:
error("DefCall: No arguments permitted for DefCallEnd/EndDefCall.")
else:
break
if cmd == "DEFAULT":
if len(ln) < 2:
error("Default: Requires at least one argument.")
a = '$'+ln[1].strip().upper()
d = ''
if len(ln) >= 2:
d = ' '.join(ln[2:])
try:
i = params.index(a)
except:
error("DefCall Default: param '%s' does not exist in '%s'." % (a, fname))
if defaults[i]:
warning("DefCall Default: param '%s' default value '%s' was set in param list."
" Overriding with '%s'." % (a, defaults[i], d))
defaults[i] = d
continue
body.append(ln)
funcList[fname] = Funcs(params, body, defaults, gbl.inpath.fname, lineN)
if MMA.debug.debug:
t = [ a[1:] for a in params]
dPrint("DefCall: Created function '%s': %s" % (fname, ', '.join(t)))
def callFunction(l):
""" Call a function. """
if len(l) < 1:
error("DefCall: At least one argument (name) is needed.")
fname = l[0].strip().upper()
if fname not in funcList:
error("Call: '%s' has not been defined." % fname)
# Convert any escaped '\,' into $ff ... see explanation in defCall()
p = ' '.join(l[1:]).replace('\,', chr(255)).split(',')
# Validate calling params
params = funcList[fname].params
callParams = []
usingDefaults = False
namedParams = {}
for a in p:
a = a.strip().replace(chr(255), ',') # commas restored
if a: # new list of params
if '=' in a:
usingDefaults = True
a,d = a.split('=')
a = '$'+a.strip().upper()
d = d.strip()
if a not in params:
error("Call: '%s' is not a param of '%s'." % (a, fname))
namedParams[a] = d
elif usingDefaults:
error("Call: cannot use a non-named param after a named one.")
else:
callParams.append(a)
if usingDefaults or len(params) != len(callParams):
s = len(callParams)
for i, p in enumerate(params[s:]):
if p in namedParams:
callParams.append(namedParams[p])
else:
d = funcList[fname].defaults[i+s]
if d is None:
#error("Call: '%s' has no default for '%s'." % (fname, p))
d="UNDEFINED"
callParams.append(d)
if len(params) != len(callParams):
error("Call: Function '%s' needs %s params, '%s' given." % \
(fname, len(params), len(callParams)))
# First, push the current values on the stack.
# To avoid pushing not existant values, NewSet is called before pushing.
# Then, set parameters as global values.
# At the end of the function, stack values are restored.
#
# This way, the parameters become local.
existingParams = [name for name in params if name[1:] in macros.vars]
pushStack = [["StackValue", name] for name in existingParams]
sets = [["Set", name[1:], value] for name, value in zip(params, callParams)]
body = funcList[fname].body
popStack = [["Set", name[1:], "$_StackValue"] for name in existingParams[::-1]]
unset = [["UnSet", name[1:]] for name in params if name[1:] not in macros.vars]
fullbody = pushStack + sets + body + popStack + unset
# we use the source line for each, but:
# - there is no stack for error displaying; error just display current line in input
# - there is no saving of original file name
#lineNs = [funcList[fname].lineN] * (len(newSets) + len(pushStack) + len(sets))
#lineNs += range(funcList[fname].lineN+1, funcList[fname].lineN+1+len(funcList[fname].body))
#lineNs += [lineNs[-1]+1] * len(popStack)
##print zip(lineNs, fullbody)
#lineNsS = ["{} ({}:{})".format(gbl.lineno, funcList[fname].fname, l) for l in lineNs]
#gbl.inpath.push(fullbody, lineNsS)
# push the converted body lines into the input stream
gbl.inpath.push(fullbody, [gbl.lineno] * len(fullbody))
#print "=" * 80
#print fname
#print zip(params, callParams)
#print body
#print "=" * 80
if MMA.debug.debug:
dPrint ("Call: function '%s' expanded." % fname)
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