133 lines
3.5 KiB
Python
133 lines
3.5 KiB
Python
# Copyright 2018 the authors.
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# This file is part of Hy, which is free software licensed under the Expat
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# license. See the LICENSE.
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import contextlib
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import os
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import re
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import sys
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import hy.macros
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import hy.compiler
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from hy._compat import builtins, string_types
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docomplete = True
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try:
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import readline
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except ImportError:
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try:
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import pyreadline.rlmain
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import pyreadline.unicode_helper # NOQA
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import readline
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except ImportError:
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docomplete = False
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if docomplete:
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if sys.platform == 'darwin' and 'libedit' in readline.__doc__:
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readline_bind = "bind ^I rl_complete"
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else:
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readline_bind = "tab: complete"
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class Completer(object):
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def __init__(self, namespace={}):
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if not isinstance(namespace, dict):
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raise TypeError('namespace must be a dictionary')
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self.namespace = namespace
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self.path = [hy.compiler._compile_table,
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builtins.__dict__,
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hy.macros._hy_macros[None],
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namespace]
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self.tag_path = [hy.macros._hy_tag[None]]
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if '__name__' in namespace:
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module_name = namespace['__name__']
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self.path.append(hy.macros._hy_macros[module_name])
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self.tag_path.append(hy.macros._hy_tag[module_name])
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def attr_matches(self, text):
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# Borrowed from IPython's completer
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m = re.match(r"(\S+(\.[\w-]+)*)\.([\w-]*)$", text)
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if m:
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expr, attr = m.group(1, 3)
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attr = attr.replace("-", "_")
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expr = expr.replace("-", "_")
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else:
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return []
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try:
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obj = eval(expr, self.namespace)
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words = dir(obj)
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except Exception:
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return []
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n = len(attr)
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matches = []
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for w in words:
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if w[:n] == attr:
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matches.append("{}.{}".format(
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expr.replace("_", "-"), w.replace("_", "-")))
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return matches
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def global_matches(self, text):
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matches = []
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for p in self.path:
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for k in p.keys():
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if isinstance(k, string_types):
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k = k.replace("_", "-")
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if k.startswith(text):
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matches.append(k)
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return matches
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def tag_matches(self, text):
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text = text[1:]
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matches = []
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for p in self.tag_path:
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for k in p.keys():
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if isinstance(k, string_types):
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if k.startswith(text):
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matches.append("#{}".format(k))
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return matches
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def complete(self, text, state):
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if text.startswith("#"):
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matches = self.tag_matches(text)
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elif "." in text:
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matches = self.attr_matches(text)
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else:
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matches = self.global_matches(text)
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try:
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return matches[state]
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except IndexError:
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return None
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@contextlib.contextmanager
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def completion(completer=None):
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delims = "()[]{} "
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if not completer:
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completer = Completer()
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if docomplete:
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readline.set_completer(completer.complete)
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readline.set_completer_delims(delims)
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history = os.path.expanduser("~/.hy-history")
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readline.parse_and_bind("set blink-matching-paren on")
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try:
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readline.read_history_file(history)
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except IOError:
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open(history, 'a').close()
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readline.parse_and_bind(readline_bind)
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try:
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yield
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finally:
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if docomplete:
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readline.write_history_file(history)
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