def evaluate_expression(input, environment=None):
"""
evaluate a string or file object in the scheme evaluator as an expression,
and return the result as a scheme object.
"""
environment = make_global_environment() if environment is None else environment
return full_evaluate(string_to_scheme(input, start_parsing=EXPRESSION),
environment)
def evaluate_expression(input, environment=None):
"""
evaluate a string or file object in the scheme evaluator as an expression,
and return the result as a scheme object.
"""
environment = make_global_environment(
) if environment is None else environment
return full_evaluate(string_to_scheme(input, start_parsing=EXPRESSION),
environment)
def evaluate(input, environment=None):
"""
evaluate a string or file object in the scheme evaluator as a program, and
return the result as a scheme object.
"""
environment = make_global_environment() if environment is None else environment
expressions = string_to_scheme(input)
for expression in expressions:
result = full_evaluate(expression, environment)
return result
def evaluate(input, environment=None):
"""
evaluate a string or file object in the scheme evaluator as a program, and
return the result as a scheme object.
"""
environment = make_global_environment(
) if environment is None else environment
expressions = string_to_scheme(input)
for expression in expressions:
result = full_evaluate(expression, environment)
return result
def repl():
#: the built-in scheme forms and special repl commands
KEYWORDS = ('lambda', 'macro', 'if', 'quote', 'eval', 'define', 'delay',
'.reset', '.exit', '.quit', '.help')
# the scheme auto-completer
def completer(text, state):
# look through SCHEME_KEYWORDS
for w in KEYWORDS:
if w.startswith(text):
if state <= 0:
return w
state -= 1
# look through the environment names
for w in environment.iterkeys():
if w.startswith(text):
if state <= 0:
return w
state -= 1
histfile = os.path.join(os.path.expanduser("~"), ".pyscheme-hist")
try:
readline.read_history_file(histfile)
except IOError:
pass
atexit.register(readline.write_history_file, histfile)
readline.parse_and_bind("tab: complete")
readline.parse_and_bind("set blink-matching-paren on")
readline.set_completer(completer)
environment = make_global_environment()
while True:
try:
text = raw_input(">> ")
# test for special commands
if text == '.reset':
print "reseting environment..."
environment = make_global_environment()
continue
elif text == '.help':
print "Just type scheme expression and have fun."
continue
elif text in ('.exit', '.quit'):
break
result = evaluate_expression(InterpreterInput(text), environment)
print "=>", pretty_print(result)
# set % as the last evaluated expression in environment
environment['%'] = quote(result)
except EOFError:
break
except KeyboardInterrupt:
print "\ninterrupt."
except Exception as e:
print "error:", e.message
print "\nexiting..."
def repl():
#: the built-in scheme forms and special repl commands
KEYWORDS = ('lambda', 'macro', 'if', 'quote', 'eval', 'define', 'delay',
'.reset', '.exit', '.quit', '.help')
# the scheme auto-completer
def completer(text, state):
# look through SCHEME_KEYWORDS
for w in KEYWORDS:
if w.startswith(text):
if state <= 0:
return w
state -= 1
# look through the environment names
for w in environment.iterkeys():
if w.startswith(text):
if state <= 0:
return w
state -= 1
histfile = os.path.join(os.path.expanduser("~"), ".pyscheme-hist")
try:
readline.read_history_file(histfile)
except IOError:
pass
atexit.register(readline.write_history_file, histfile)
readline.parse_and_bind("tab: complete")
readline.parse_and_bind("set blink-matching-paren on")
readline.set_completer(completer)
environment = make_global_environment()
while True:
try:
text = raw_input(">> ")
# test for special commands
if text == '.reset':
print "reseting environment..."
environment = make_global_environment()
continue
elif text == '.help':
print "Just type scheme expression and have fun."
continue
elif text in ('.exit', '.quit'):
break
result = evaluate_expression(InterpreterInput(text),
environment)
print "=>", pretty_print(result)
# set % as the last evaluated expression in environment
environment['%'] = quote(result)
except EOFError:
break
except KeyboardInterrupt:
print "\ninterrupt."
except Exception as e:
print "error:", e.message
print "\nexiting..."
