def entry_point(argv):
path = argv[0] if len(argv) == 1 else argv[-1]
try:
f = open_file_as_stream(path, buffering=0)
except OSError as exc:
os.write(2, "%s -- %s (LoadError)\n" % (os.strerror(exc.errno), path))
return 1
try:
code = f.readall()
finally:
f.close()
try:
t = parse(code)
except BacktrackException as exc:
(line, col) = exc.error.get_line_column(code)
# expected = ' '.join(exc.error.expected)
os.write(2, "parse error in line %d, column %d" % (line, col))
return 1
ctx = ExecutionContext()
try:
for sexpr in t:
try:
print(sexpr.eval(ctx).to_string())
except ContinuationReturn as exc:
print(exc.result.to_string())
except SchemeQuit:
return 0
else:
return 0
def main():
print "PyPy Scheme interpreter"
ctx = ExecutionContext()
to_exec = ""
cont = False
while True:
if cont:
ps = ".. "
else:
ps = "-> "
sys.stdout.write(ps)
to_exec += sys.stdin.readline()
if to_exec == "\n":
to_exec = ""
elif _check_parens(to_exec):
try:
if to_exec == "":
print ("")
raise SchemeQuit
print (parse(to_exec)[0].eval(ctx).to_repr())
except SchemeQuit:
break
except ContinuationReturn as exc:
print (exc.result.to_string())
except SchemeException as exc:
print ("error: %s" % exc)
except BacktrackException as exc:
(line, col) = exc.error.get_line_column(to_exec)
expected = " ".join(exc.error.expected)
print ("parse error: in line %s, column %s expected: %s" % (line, col, expected))
to_exec = ""
cont = False
else:
cont = True
