#
# Instant Python
# $Id: PythonInterpreter.py,v 1.8 2003/10/13 08:24:06 riaan Exp $
#
# process python commands line by line
#
# written by Fredrik Lundh, November 1996
#
# fredrik@pythonware.com
# http://www.pythonware.com
#
import string, sys, traceback, linecache
sys.ps1 = ">>> "
sys.ps2 = "... "
class PythonInterpreter:
def __init__(self, name = "<console>"):
self.name = name
self.locals = {}
self.lines = []
def push(self, line):
#
# collect lines
if self.lines:
if line:
self.lines.append(line)
return 1 # want more!
else:
line = string.join(self.lines, "\n") + "\n"
else:
if not line:
return 0
else:
line = line.rstrip()+'\n'
#
# compile what we've got this far
try:
if sys.version_info[:2] >= (2, 2):
import __future__
code = compile(line, self.name, "single",
__future__.generators.compiler_flag, 1)
else:
code = compile(line, self.name, "single")
self.lines = []
except SyntaxError, why:
if why[0] == "unexpected EOF while parsing":
# start collecting lines
self.lines.append(line)
return 1 # want more!
else:
self.showtraceback()
except:
self.showtraceback()
else:
# execute
try:
exec code in self.locals
except:
self.showtraceback()
return 0
def showtraceback(self):
self.lines = []
exc_type, exc_value, exc_traceback = sys.exc_info()
if exc_type == SyntaxError:# and len(sys.exc_value) == 2:
# emulate interpreter behaviour
if len(sys.exc_value.args) == 2:
fn, ln, indent = sys.exc_value[1][:3]
indent += 3
pad = " " * indent
if fn is not None:
src = linecache.getline(fn, ln)
if src:
src = src.rstrip()+'\n'
sys.stderr.write(' File "%s", line %d\n%s%s'%(
fn, ln, pad, src))
sys.stderr.write(pad + "^\n")
sys.stderr.write("''' %s '''\n"%(str(sys.exc_type) + \
str(sys.exc_value.args and (" : " +sys.exc_value[0]) or '')))
else:
traceback.print_tb(sys.exc_traceback.tb_next, None)
sys.stderr.write("''' %s '''\n" %(str(sys.exc_type) + " : " + \
str(sys.exc_value)))
# --------------------------------------------------------------------
# test stuff
if __name__ == "__main__":
#
# simple console interpreter simulation
print 'Python', sys.version, "(PythonInterpreter)"
print sys.copyright
interp = PythonInterpreter()
try:
sys.stdout.write(sys.ps1)
while 1:
if interp.push(raw_input()):
sys.stdout.write(sys.ps2)
else:
sys.stdout.write(sys.ps1)
except EOFError:
pass
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