4710c53dca
These files are a subset of the python-2.7.2.tgz distribution from python.org. Changed files from PyMod-2.7.2 have been copied into the corresponding directories of this tree, replacing the original files in the distribution. Signed-off-by: daryl.mcdaniel@intel.com git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13197 6f19259b-4bc3-4df7-8a09-765794883524
295 lines
9.8 KiB
Python
295 lines
9.8 KiB
Python
"""Generate ast module from specification
|
|
|
|
This script generates the ast module from a simple specification,
|
|
which makes it easy to accomodate changes in the grammar. This
|
|
approach would be quite reasonable if the grammar changed often.
|
|
Instead, it is rather complex to generate the appropriate code. And
|
|
the Node interface has changed more often than the grammar.
|
|
"""
|
|
|
|
import fileinput
|
|
import re
|
|
import sys
|
|
from StringIO import StringIO
|
|
|
|
SPEC = "ast.txt"
|
|
COMMA = ", "
|
|
|
|
def load_boilerplate(file):
|
|
f = open(file)
|
|
buf = f.read()
|
|
f.close()
|
|
i = buf.find('### ''PROLOGUE')
|
|
j = buf.find('### ''EPILOGUE')
|
|
pro = buf[i+12:j].strip()
|
|
epi = buf[j+12:].strip()
|
|
return pro, epi
|
|
|
|
def strip_default(arg):
|
|
"""Return the argname from an 'arg = default' string"""
|
|
i = arg.find('=')
|
|
if i == -1:
|
|
return arg
|
|
t = arg[:i].strip()
|
|
return t
|
|
|
|
P_NODE = 1
|
|
P_OTHER = 2
|
|
P_NESTED = 3
|
|
P_NONE = 4
|
|
|
|
class NodeInfo:
|
|
"""Each instance describes a specific AST node"""
|
|
def __init__(self, name, args):
|
|
self.name = name
|
|
self.args = args.strip()
|
|
self.argnames = self.get_argnames()
|
|
self.argprops = self.get_argprops()
|
|
self.nargs = len(self.argnames)
|
|
self.init = []
|
|
|
|
def get_argnames(self):
|
|
if '(' in self.args:
|
|
i = self.args.find('(')
|
|
j = self.args.rfind(')')
|
|
args = self.args[i+1:j]
|
|
else:
|
|
args = self.args
|
|
return [strip_default(arg.strip())
|
|
for arg in args.split(',') if arg]
|
|
|
|
def get_argprops(self):
|
|
"""Each argument can have a property like '*' or '!'
|
|
|
|
XXX This method modifies the argnames in place!
|
|
"""
|
|
d = {}
|
|
hardest_arg = P_NODE
|
|
for i in range(len(self.argnames)):
|
|
arg = self.argnames[i]
|
|
if arg.endswith('*'):
|
|
arg = self.argnames[i] = arg[:-1]
|
|
d[arg] = P_OTHER
|
|
hardest_arg = max(hardest_arg, P_OTHER)
|
|
elif arg.endswith('!'):
|
|
arg = self.argnames[i] = arg[:-1]
|
|
d[arg] = P_NESTED
|
|
hardest_arg = max(hardest_arg, P_NESTED)
|
|
elif arg.endswith('&'):
|
|
arg = self.argnames[i] = arg[:-1]
|
|
d[arg] = P_NONE
|
|
hardest_arg = max(hardest_arg, P_NONE)
|
|
else:
|
|
d[arg] = P_NODE
|
|
self.hardest_arg = hardest_arg
|
|
|
|
if hardest_arg > P_NODE:
|
|
self.args = self.args.replace('*', '')
|
|
self.args = self.args.replace('!', '')
|
|
self.args = self.args.replace('&', '')
|
|
|
|
return d
|
|
|
|
def gen_source(self):
|
|
buf = StringIO()
|
|
print >> buf, "class %s(Node):" % self.name
|
|
self._gen_init(buf)
|
|
print >> buf
|
|
self._gen_getChildren(buf)
|
|
print >> buf
|
|
self._gen_getChildNodes(buf)
|
|
print >> buf
|
|
self._gen_repr(buf)
|
|
buf.seek(0, 0)
|
|
return buf.read()
|
|
|
|
def _gen_init(self, buf):
|
|
if self.args:
|
|
argtuple = '(' in self.args
|
|
args = self.args if not argtuple else ''.join(self.argnames)
|
|
print >> buf, " def __init__(self, %s, lineno=None):" % args
|
|
else:
|
|
print >> buf, " def __init__(self, lineno=None):"
|
|
if self.argnames:
|
|
if argtuple:
|
|
for idx, name in enumerate(self.argnames):
|
|
print >> buf, " self.%s = %s[%s]" % (name, args, idx)
|
|
else:
|
|
for name in self.argnames:
|
|
print >> buf, " self.%s = %s" % (name, name)
|
|
print >> buf, " self.lineno = lineno"
|
|
# Copy the lines in self.init, indented four spaces. The rstrip()
|
|
# business is to get rid of the four spaces if line happens to be
|
|
# empty, so that reindent.py is happy with the output.
|
|
for line in self.init:
|
|
print >> buf, (" " + line).rstrip()
|
|
|
|
def _gen_getChildren(self, buf):
|
|
print >> buf, " def getChildren(self):"
|
|
if len(self.argnames) == 0:
|
|
print >> buf, " return ()"
|
|
else:
|
|
if self.hardest_arg < P_NESTED:
|
|
clist = COMMA.join(["self.%s" % c
|
|
for c in self.argnames])
|
|
if self.nargs == 1:
|
|
print >> buf, " return %s," % clist
|
|
else:
|
|
print >> buf, " return %s" % clist
|
|
else:
|
|
if len(self.argnames) == 1:
|
|
print >> buf, " return tuple(flatten(self.%s))" % self.argnames[0]
|
|
else:
|
|
print >> buf, " children = []"
|
|
template = " children.%s(%sself.%s%s)"
|
|
for name in self.argnames:
|
|
if self.argprops[name] == P_NESTED:
|
|
print >> buf, template % ("extend", "flatten(",
|
|
name, ")")
|
|
else:
|
|
print >> buf, template % ("append", "", name, "")
|
|
print >> buf, " return tuple(children)"
|
|
|
|
def _gen_getChildNodes(self, buf):
|
|
print >> buf, " def getChildNodes(self):"
|
|
if len(self.argnames) == 0:
|
|
print >> buf, " return ()"
|
|
else:
|
|
if self.hardest_arg < P_NESTED:
|
|
clist = ["self.%s" % c
|
|
for c in self.argnames
|
|
if self.argprops[c] == P_NODE]
|
|
if len(clist) == 0:
|
|
print >> buf, " return ()"
|
|
elif len(clist) == 1:
|
|
print >> buf, " return %s," % clist[0]
|
|
else:
|
|
print >> buf, " return %s" % COMMA.join(clist)
|
|
else:
|
|
print >> buf, " nodelist = []"
|
|
template = " nodelist.%s(%sself.%s%s)"
|
|
for name in self.argnames:
|
|
if self.argprops[name] == P_NONE:
|
|
tmp = (" if self.%s is not None:\n"
|
|
" nodelist.append(self.%s)")
|
|
print >> buf, tmp % (name, name)
|
|
elif self.argprops[name] == P_NESTED:
|
|
print >> buf, template % ("extend", "flatten_nodes(",
|
|
name, ")")
|
|
elif self.argprops[name] == P_NODE:
|
|
print >> buf, template % ("append", "", name, "")
|
|
print >> buf, " return tuple(nodelist)"
|
|
|
|
def _gen_repr(self, buf):
|
|
print >> buf, " def __repr__(self):"
|
|
if self.argnames:
|
|
fmt = COMMA.join(["%s"] * self.nargs)
|
|
if '(' in self.args:
|
|
fmt = '(%s)' % fmt
|
|
vals = ["repr(self.%s)" % name for name in self.argnames]
|
|
vals = COMMA.join(vals)
|
|
if self.nargs == 1:
|
|
vals = vals + ","
|
|
print >> buf, ' return "%s(%s)" %% (%s)' % \
|
|
(self.name, fmt, vals)
|
|
else:
|
|
print >> buf, ' return "%s()"' % self.name
|
|
|
|
rx_init = re.compile('init\((.*)\):')
|
|
|
|
def parse_spec(file):
|
|
classes = {}
|
|
cur = None
|
|
for line in fileinput.input(file):
|
|
if line.strip().startswith('#'):
|
|
continue
|
|
mo = rx_init.search(line)
|
|
if mo is None:
|
|
if cur is None:
|
|
# a normal entry
|
|
try:
|
|
name, args = line.split(':')
|
|
except ValueError:
|
|
continue
|
|
classes[name] = NodeInfo(name, args)
|
|
cur = None
|
|
else:
|
|
# some code for the __init__ method
|
|
cur.init.append(line)
|
|
else:
|
|
# some extra code for a Node's __init__ method
|
|
name = mo.group(1)
|
|
cur = classes[name]
|
|
return sorted(classes.values(), key=lambda n: n.name)
|
|
|
|
def main():
|
|
prologue, epilogue = load_boilerplate(sys.argv[-1])
|
|
print prologue
|
|
print
|
|
classes = parse_spec(SPEC)
|
|
for info in classes:
|
|
print info.gen_source()
|
|
print epilogue
|
|
|
|
if __name__ == "__main__":
|
|
main()
|
|
sys.exit(0)
|
|
|
|
### PROLOGUE
|
|
"""Python abstract syntax node definitions
|
|
|
|
This file is automatically generated by Tools/compiler/astgen.py
|
|
"""
|
|
from consts import CO_VARARGS, CO_VARKEYWORDS
|
|
|
|
def flatten(seq):
|
|
l = []
|
|
for elt in seq:
|
|
t = type(elt)
|
|
if t is tuple or t is list:
|
|
for elt2 in flatten(elt):
|
|
l.append(elt2)
|
|
else:
|
|
l.append(elt)
|
|
return l
|
|
|
|
def flatten_nodes(seq):
|
|
return [n for n in flatten(seq) if isinstance(n, Node)]
|
|
|
|
nodes = {}
|
|
|
|
class Node:
|
|
"""Abstract base class for ast nodes."""
|
|
def getChildren(self):
|
|
pass # implemented by subclasses
|
|
def __iter__(self):
|
|
for n in self.getChildren():
|
|
yield n
|
|
def asList(self): # for backwards compatibility
|
|
return self.getChildren()
|
|
def getChildNodes(self):
|
|
pass # implemented by subclasses
|
|
|
|
class EmptyNode(Node):
|
|
pass
|
|
|
|
class Expression(Node):
|
|
# Expression is an artificial node class to support "eval"
|
|
nodes["expression"] = "Expression"
|
|
def __init__(self, node):
|
|
self.node = node
|
|
|
|
def getChildren(self):
|
|
return self.node,
|
|
|
|
def getChildNodes(self):
|
|
return self.node,
|
|
|
|
def __repr__(self):
|
|
return "Expression(%s)" % (repr(self.node))
|
|
|
|
### EPILOGUE
|
|
for name, obj in globals().items():
|
|
if isinstance(obj, type) and issubclass(obj, Node):
|
|
nodes[name.lower()] = obj
|