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# Copyright (c) Corporation for National Research Initiatives
from PythonVisitor import PythonVisitor, nodeToList
from org.python.parser.PythonGrammarTreeConstants import *
import jast
class BaseEvaluator:
def __init__(self):
self.globalnames = {}
self.augtemps = {}
self.lineno = -1
self.visitor = PythonVisitor(self)
self.imp_accu = None
def parse(self, node):
try:
return self.visit(node)
except:
print 'Parsing line: %d' % self.lineno
if hasattr(self, 'data') and self.lineno > 0:
print self.data.split('\n')[self.lineno-1]
raise
def setline(self, lineno):
self.lineno = lineno
def getName(self, name, fast_locals=0):
return self.visitor.getName(name, fast_locals)
def visit(self, node):
return node.visit(self.visitor)
def getAugTmps(self, node):
tmps = self.augtemps[node]
for var in tmps:
self.freeTemp(var)
del self.augtemps[node]
return tmps
def setAugTmps(self, node, stmts, *vars):
ret = []
for var in vars:
tmp, code = self.makeTemp(var)
stmts.append(code)
ret.append(tmp)
self.augtemps[node] = ret
return ret
def suite(self, nodes):
ret = []
for node in nodes:
ret.append(self.visit(node))
return ret
def del_stmt(self, nodes):
stmts = []
for node in nodes:
stmts.append(self.delete(node))
return stmts
def delete(self, node):
if node.id == JJTNAME:
return self.del_name(self.getName(node, self.frame.fast_locals))
elif node.id == JJTLIST or node.id == JJTTUPLE:
return self.del_list(nodeToList(node))
elif node.id == JJTINDEX_OP:
return self.del_item(node.getChild(0),
node.getChild(1))
elif node.id == JJTDOT_OP:
return self.del_attribute(node.getChild(0),
self.getName(node.getChild(1)))
else:
raise TypeError, 'help, fancy lhs: %s' % node
def del_list(self, seq):
return self.del_stmt(seq)
def del_item(self, obj, index):
if index.id == JJTSLICE:
start, stop, step = self.getSlice(index)
return self.visit(obj).delslice(start, stop, step)
return self.visit(obj).delitem(self.visit(index))
def del_attribute(self, obj, name):
return self.visit(obj).delattr(name)
def set(self, node, value):
if node.id == JJTNAME:
return self.set_name(self.getName(node, self.frame.fast_locals),
value)
elif node.id == JJTLIST or node.id == JJTFPLIST or node.id == JJTTUPLE:
return self.set_list(nodeToList(node), value)
elif node.id == JJTINDEX_OP:
return self.set_item(node.getChild(0),
node.getChild(1), value)
elif node.id == JJTDOT_OP:
return self.set_attribute(node.getChild(0),
self.getName(node.getChild(1)), value)
else:
raise TypeError, 'help, fancy lhs: %s' % node
def set_list(self, seq, value):
if hasattr(self, 'AUG'):
raise SyntaxError, "augmented assign to tuple not possible"
if len(seq) > 0 and seq[-1].id == JJTCOMMA:
del seq[-1]
n = len(seq)
unpacked = jast.InvokeStatic("org.python.core.Py", "unpackSequence",
[value.asAny(), jast.IntegerConstant(n)])
tmp = self.frame.gettemp('PyObject[]')
stmts = [ jast.Set(tmp, unpacked) ]
for i in range(n):
code = jast.Subscript(tmp, i)
stmts.append(self.set(seq[i], self.factory.makePyObject(code)))
self.frame.freetemp(tmp)
return stmts
def set_item(self, obj, index, value):
if index.id == JJTSLICE:
if hasattr(self, 'AUG'):
o, start, stop, step = self.getAugTmps(obj)
else:
o = self.visit(obj)
start, stop, step = self.getSlice(index)
return o.setslice(start, stop, step, value)
if hasattr(self, 'AUG'):
o, idx = self.getAugTmps(obj)
else:
o = self.visit(obj)
idx = self.visit(index)
return o.setitem(idx, value)
def set_attribute(self, obj, name, value):
if hasattr(self, 'AUG'):
o, = self.getAugTmps(obj)
else:
o = self.visit(obj)
return o.setattr(name, value)
def get_item(self, obj, index):
if index.id == JJTSLICE:
start, stop, step = self.getSlice(index)
o = self.visit(obj)
if hasattr(self, 'AUG'):
o, start, stop, step = self.setAugTmps(obj, self.AUG,
o, start, stop, step)
return o.getslice(start, stop, step)
idx = self.visit(index)
o = self.visit(obj)
if hasattr(self, 'AUG'):
o, idx = self.setAugTmps(obj, self.AUG, o, idx)
return o.getitem(idx)
def get_attribute(self, obj, name):
o = self.visit(obj)
if hasattr(self, 'AUG'):
o, = self.setAugTmps(obj, self.AUG, o)
return o.getattr(name)
def makeTemp(self, value):
return value
def freeTemp(self, tmp): pass
def makeFreeDecl(self,type,value): pass
def expr_stmt(self, lhss, rhs):
if len(lhss) == 0:
return self.visit(rhs).makeStatement()
if len(lhss) == 1:
return self.set(lhss[0], self.visit(rhs))
tmp, code = self.makeTemp(self.visit(rhs))
stmts = [code]
for lhs in lhss:
stmts.append(self.set(lhs, tmp))
self.freeTemp(tmp)
return stmts
def binary_op(self, name, x, y):
return self.visit(x).binop(name, self.visit(y))
def unary_op(self, name, x):
return self.visit(x).unop(name)
def aug_binary_op(self, name, lhs, rhs):
tmp, code = self.makeTemp(self.visit(rhs))
stmts = [code]
self.AUG = stmts
l = self.visit(lhs)
result = l.aug_binop(name, tmp)
stmts.append(self.set(lhs, result))
del self.AUG
self.freeTemp(tmp)
return stmts
def compare_op(self, start, compares):
x = self.visit(start)
for op, other in compares:
y = self.visit(other)
test = x.compop(op, y)
if not test.nonzero():
return test
x = y
return test
def print_line(self, value=None):
if value is None:
print
else:
return self.visit(value).print_line()
def print_continued(self, value):
return self.visit(value).print_continued()
def visitall(self, args):
ret = []
for arg in args:
ret.append(self.visit(arg))
return ret
def visitnames(self, kws):
ret = []
for name, value in kws:
ret.append( (name, self.visit(value)) )
return ret
def invoke(self, obj, name, args, kws):
return self.visit(obj).invoke(name, self.visitall(args),
self.visitnames(kws))
def call(self, callee, args, kws):
return self.visit(callee).call(self.visitall(args),
self.visitnames(kws))
def call_extra(self, callee, args, kws, starargs, kwargs):
#print "call_extra", self.visit(callee)
if starargs:
starargs = self.visit(starargs.getChild(0))
if kwargs:
kwargs = self.visit(kwargs.getChild(0))
return self.visit(callee).call_extra(self.visitall(args),
self.visitnames(kws),
starargs,
kwargs)
def global_stmt(self, names):
for name in names:
self.globalnames[name] = 1
def import_stmt(self, names):
ret = []
for name in names:
ret.append(self.set_name(name[0], self.get_module(name)))
return ret
def importall_stmt(self, top):
pass
def importfrom_stmt(self, top, names):
module = self.get_module(top, 0)
if names == '*':
return self.importall_stmt(module)
#print 'import * from', module
#names = module.dir()
modnames = []
asnames = []
for modname, asname in names:
if asname is None:
asname = modname
asnames.append(asname)
modnames.append(modname)
topmodname = jast.StringConstant(".".join(top))
modnamesArray = jast.FilledArray(
"String",
map(lambda x: jast.StringConstant(x), modnames))
do_import = jast.InvokeStatic("org.python.core.imp", "importFrom",
[topmodname, modnamesArray,
self.frame.frame])
if not self.imp_accu:
imp_accu = self.imp_accu = jast.Identifier("imp_accu")
self.makeFreeDecl("PyObject[]",imp_accu)
else:
imp_accu = self.imp_accu
stmts = [jast.Set(imp_accu,do_import)]
for i in range(len(asnames)):
asname = asnames[i]
modname = modnames[i]
code = jast.Subscript(imp_accu,i)
stmts.append(self.set_name(asname,
module.getattr(modname).makeReference(code)))
stmts.append(jast.Set(imp_accu,jast.Null))
return stmts
#external interfaces
def execstring(self, data):
self.data = data
from org.python.core import parser
node = parser.parse(data, 'exec')
return self.parse(node)
def execfile(self, filename):
fp = open(filename, 'r')
data = fp.read()
fp.close()
return execstring(data)
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