def buffer_lines(lines, prompt="scm> ", show_prompt=False):
"""Return a Buffer instance iterating through LINES."""
if show_prompt:
input_lines = lines
else:
input_lines = LineReader(lines, prompt)
return Buffer(tokenize_lines(input_lines))
def run_tests(src_file = 'tests.scm'):
"""Run a read-eval loop that reads from src_file and collects outputs."""
sys.stderr = sys.stdout = io.StringIO() # Collect output to stdout and stderr
try:
reader = TestReader(open(src_file).readlines())
src = Buffer(tokenize_lines(reader))
def next_line():
src.current()
return src
read_eval_print_loop(next_line, create_global_frame())
except BaseException as exc:
sys.stderr = sys.__stderr__
print("Tests terminated due to unhandled exception "
"after line {0}:\n>>>".format(reader.line_number),
file=sys.stderr)
raise
output = sys.stdout.getvalue().split('\n')
sys.stdout = sys.__stdout__ # Revert stdout
summarize(output, reader.expected_output)
def buffer_input(prompt="scm> "): # 从输入获取一行，然后将这一行数据传递给tokenize_lines
# tokenize_lines处理之后，输出串token，传递个buffer，buffer可是一个可以迭代的对象，所以，你懂的!
"""Return a Buffer instance containing interactive input."""
return Buffer(tokenize_lines(InputReader(prompt)))
def buffer_input():
return Buffer(tokenize_lines(InputReader('> ')))
def read_line(line):
"""Read a single string LINE as a Scheme expression."""
return scheme_read(Buffer(tokenize_lines([line])))
def buffer_input(prompt='scm> '):
"""Return a Buffer instance containing interactive input."""
return Buffer(tokenize_lines(InputReader(prompt)))
def buffer_input(prompt="scm> "): # 从输入获取一行，然后将这一行数据传递给tokenize_lines
# tokenize_lines处理之后，输出串token，传递个buffer，buffer可是一个可以迭代的对象，所以，你懂的!
"""Return a Buffer instance containing interactive input."""
return Buffer(tokenize_lines(InputReader(prompt)))
def buffer_lines(lines, prompt='scm> ', show_prompt=False):
if show_prompt:
input_lines = lines
else:
input_lines = LineReader(lines, prompt)
return Buffer(tokenize_lines(input_lines))
def buffer_lines(lines):
"""Return a Buffer instance iterating through LINES."""
return Buffer(tokenize_lines(LineReader(lines, "scm> ")))
def buffer_input(prompt='scm> '):
return Buffer(tokenize_lines(InputReader(prompt)))
def buffer_input():
return Buffer(tokenize_lines(InputReader('> ')))
def scheme_repl(source, prompt, env, print_input=True):
"""Start a read-eval-print loop reading from SOURCE."""
read_eval_print(Buffer(tokenize_lines(source)), prompt, env, print_input)
# Interactive loop
def read_print_loop():
"""Run a read-print loop for Scheme expressions."""
while True:
try:
src = buffer_input('read> ')
while src.more_on_line:
expression = scheme_read(src)
if expression == 'exit':
print()
return
print('str :', expression)
print('repr:', repr(expression))
except (SyntaxError, ValueError) as err:
print(type(err).__name__ + ':', err)
except (KeyboardInterrupt, EOFError): # <Control>-D, etc.
print()
return
@main
def main(*args):
if len(args) and '--repl' in args:
read_print_loop()
#marker 3
print((read_tail(Buffer(tokenize_lines(['2 (3 4))'])))))
def buffer_lines(lines, prompt="scm> "):
"""Return a Buffer instance iterating through LINES."""
return Buffer(tokenize_lines(LineReader(lines, prompt)))
def read_line(line):
return scheme_read(Buffer(tokenize_lines([line])))
def buffer_input(prompt="scm> "):
"""Return a Buffer instance containing interactive input."""
return Buffer(tokenize_lines(InputReader(prompt)))
from scheme_reader import *
from buffer import Buffer, InputReader, LineReader
from scheme_tokens import tokenize_lines, DELIMITERS
lines = ["(+ 1 ", "(+ 23 4)) ("]
src = Buffer(tokenize_lines(lines))
print(scheme_read(src))
print(repr(read_line("'hello")))
print(read_line("(car '(1 2))"))
print(repr(read_tail(Buffer(tokenize_lines([")"])))))
print(repr(read_tail(Buffer(tokenize_lines(["2 3)"])))))
print(repr(read_tail(Buffer(tokenize_lines(["2 (3 4))"])))))
print(repr(read_line("(1 . 2)")))
print(repr(read_line("(1 2 . 3)")))
print(repr(read_line("(1 . 2 3)")))
print(repr(scheme_read(Buffer(tokenize_lines(["(1", "2 .", "'(3 4))", "4"])))))
def read_line(line):
"""Read a single string LINE as a Scheme expression."""
return scheme_read(Buffer(tokenize_lines([line])))
def buffer_input():
return Buffer(tokenize_lines(InputReader(
'> '))) # 将list of token lists放入Buffer，Buffer就像一个流，可以逐步消耗其中的token。
