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255 lines
8.6 KiB
255 lines
8.6 KiB
"""Elpy backend using the Jedi library.
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This backend uses the Jedi library:
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https://github.com/davidhalter/jedi
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"""
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import sys
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import traceback
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import jedi
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from elpy import rpc
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class JediBackend(object):
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"""The Jedi backend class.
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Implements the RPC calls we can pass on to Jedi.
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Documentation: http://jedi.jedidjah.ch/en/latest/docs/plugin-api.html
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"""
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name = "jedi"
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def __init__(self, project_root):
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self.project_root = project_root
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self.completions = {}
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sys.path.append(project_root)
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def rpc_get_completions(self, filename, source, offset):
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line, column = pos_to_linecol(source, offset)
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proposals = run_with_debug(jedi, 'completions',
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source=source, line=line, column=column,
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path=filename, encoding='utf-8')
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if proposals is None:
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return []
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self.completions = dict((proposal.name, proposal)
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for proposal in proposals)
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return [{'name': proposal.name,
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'suffix': proposal.complete,
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'annotation': proposal.type,
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'meta': proposal.description}
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for proposal in proposals]
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def rpc_get_completion_docstring(self, completion):
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proposal = self.completions.get(completion)
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if proposal is None:
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return None
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else:
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return proposal.docstring(fast=False)
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def rpc_get_completion_location(self, completion):
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proposal = self.completions.get(completion)
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if proposal is None:
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return None
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else:
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return (proposal.module_path, proposal.line)
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def rpc_get_definition(self, filename, source, offset):
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line, column = pos_to_linecol(source, offset)
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try:
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locations = run_with_debug(jedi, 'goto_definitions',
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source=source, line=line, column=column,
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path=filename, encoding='utf-8',
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re_raise=jedi.NotFoundError)
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except jedi.NotFoundError:
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return None
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# goto_definitions() can return silly stuff like __builtin__
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# for int variables, so we fall back on goto() in those
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# cases. See issue #76.
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if (
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locations and
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locations[0].module_path is None
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):
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locations = run_with_debug(jedi, 'goto_assignments',
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source=source, line=line,
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column=column,
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path=filename, encoding='utf-8')
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if not locations:
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return None
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else:
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loc = locations[-1]
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try:
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if loc.module_path:
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if loc.module_path == filename:
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offset = linecol_to_pos(source,
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loc.line,
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loc.column)
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else:
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with open(loc.module_path) as f:
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offset = linecol_to_pos(f.read(),
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loc.line,
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loc.column)
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except IOError:
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return None
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return (loc.module_path, offset)
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def rpc_get_calltip(self, filename, source, offset):
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line, column = pos_to_linecol(source, offset)
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calls = run_with_debug(jedi, 'call_signatures',
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source=source, line=line, column=column,
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path=filename, encoding='utf-8')
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if calls:
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call = calls[0]
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else:
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call = None
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if not call:
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return None
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return {"name": call.name,
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"index": call.index,
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"params": [param.description for param in call.params]}
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def rpc_get_usages(self, filename, source, offset):
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"""Return the uses of the symbol at offset.
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Returns a list of occurrences of the symbol, as dicts with the
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fields name, filename, and offset.
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"""
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line, column = pos_to_linecol(source, offset)
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try:
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uses = run_with_debug(jedi, 'usages',
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source=source, line=line, column=column,
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path=filename, encoding='utf-8',
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re_raise=(jedi.NotFoundError,))
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except jedi.NotFoundError:
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return []
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if uses is None:
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return None
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result = []
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for use in uses:
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if use.module_path == filename:
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offset = linecol_to_pos(source, use.line, use.column)
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else:
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with open(use.module_path) as f:
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text = f.read()
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offset = linecol_to_pos(text, use.line, use.column)
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result.append({"name": use.name,
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"filename": use.module_path,
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"offset": offset})
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return result
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# From the Jedi documentation:
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#
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# line is the current line you want to perform actions on (starting
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# with line #1 as the first line). column represents the current
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# column/indent of the cursor (starting with zero). source_path
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# should be the path of your file in the file system.
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def pos_to_linecol(text, pos):
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"""Return a tuple of line and column for offset pos in text.
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Lines are one-based, columns zero-based.
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This is how Jedi wants it. Don't ask me why.
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"""
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line_start = text.rfind("\n", 0, pos) + 1
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line = text.count("\n", 0, line_start) + 1
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col = pos - line_start
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return line, col
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def linecol_to_pos(text, line, col):
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"""Return the offset of this line and column in text.
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Lines are one-based, columns zero-based.
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This is how Jedi wants it. Don't ask me why.
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"""
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nth_newline_offset = 0
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for i in range(line - 1):
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new_offset = text.find("\n", nth_newline_offset)
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if new_offset < 0:
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raise ValueError("Text does not have {0} lines."
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.format(line))
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nth_newline_offset = new_offset + 1
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offset = nth_newline_offset + col
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if offset > len(text):
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raise ValueError("Line {0} column {1} is not within the text"
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.format(line, col))
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return offset
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def run_with_debug(jedi, name, *args, **kwargs):
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re_raise = kwargs.pop('re_raise', ())
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# Remove form feed characters, they confuse Jedi (jedi#424)
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if 'source' in kwargs:
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kwargs['source'] = kwargs['source'].replace("\f", " ")
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try:
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script = jedi.Script(*args, **kwargs)
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return getattr(script, name)()
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except Exception as e:
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if isinstance(e, re_raise):
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raise
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# Bug jedi#417
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if isinstance(e, TypeError) and str(e) == 'no dicts allowed':
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return None
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# Bug jedi#427
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if isinstance(e, UnicodeDecodeError):
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return None
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# Bug jedi#429
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if isinstance(e, IndexError):
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return None
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# Bug jedi#431
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if isinstance(e, AttributeError) and str(e).endswith("'end_pos'"):
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return None
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# Bug in Python 2.6, see #275
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if isinstance(e, OSError) and e.errno == 13:
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return None
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from jedi import debug
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debug_info = []
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def _debug(level, str_out):
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if level == debug.NOTICE:
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prefix = "[N]"
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elif level == debug.WARNING:
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prefix = "[W]"
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else:
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prefix = "[?]"
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debug_info.append("{0} {1}".format(prefix, str_out))
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jedi.set_debug_function(_debug, speed=False)
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try:
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script = jedi.Script(*args, **kwargs)
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return getattr(script, name)()
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except Exception as e:
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source = kwargs.get('source')
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sc_args = []
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sc_args.extend(repr(arg) for arg in args)
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sc_args.extend("{0}={1}".format(k, "source" if k == "source"
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else repr(v))
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for (k, v) in kwargs.items())
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data = {
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"traceback": traceback.format_exc(),
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"jedi_debug_info": {'script_args': ", ".join(sc_args),
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'source': source,
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'method': name,
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'debug_info': debug_info}
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}
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raise rpc.Fault(message=str(e),
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code=500,
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data=data)
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finally:
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jedi.set_debug_function(None)
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