forked from VimPlug/jedi
595 lines
22 KiB
Python
595 lines
22 KiB
Python
"""
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Basically a contains parser that is faster, because it tries to parse only
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parts and if anything changes, it only reparses the changed parts.
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It works with a simple diff in the beginning and will try to reuse old parser
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fragments.
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"""
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import copy
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import re
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import difflib
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from jedi._compatibility import use_metaclass
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from jedi import settings
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from jedi.common import splitlines
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from jedi.parser import ParserWithRecovery
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from jedi.parser.tree import Module, search_ancestor, EndMarker, Flow
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from jedi.parser.utils import parser_cache
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from jedi import debug
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from jedi.parser.tokenize import (generate_tokens, NEWLINE, TokenInfo,
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ENDMARKER, INDENT, DEDENT)
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class CachedFastParser(type):
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""" This is a metaclass for caching `FastParser`. """
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def __call__(self, grammar, source, module_path=None):
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pi = parser_cache.get(module_path, None)
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if pi is None or not settings.fast_parser:
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return ParserWithRecovery(grammar, source, module_path)
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parser = pi.parser
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d = DiffParser(parser)
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new_lines = splitlines(source, keepends=True)
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parser.module = parser._parsed = d.update(new_lines)
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return parser
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class FastParser(use_metaclass(CachedFastParser)):
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pass
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def _merge_used_names(base_dict, other_dict):
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for key, names in other_dict.items():
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base_dict.setdefault(key, []).extend(names)
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def _get_last_line(node_or_leaf):
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last_leaf = node_or_leaf.last_leaf()
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if last_leaf.type == 'error_leaf':
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typ = last_leaf.original_type
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else:
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typ = last_leaf.type
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if typ == 'newline':
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return last_leaf.start_pos[0]
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else:
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return last_leaf.end_pos[0]
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def _flows_finished(grammar, stack):
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"""
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if, while, for and try might not be finished, because another part might
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still be parsed.
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"""
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for dfa, newstate, (symbol_number, nodes) in stack:
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if grammar.number2symbol[symbol_number] in ('if_stmt', 'while_stmt',
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'for_stmt', 'try_stmt'):
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return False
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return True
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def suite_or_file_input_is_valid(grammar, stack):
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if not _flows_finished(grammar, stack):
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return False
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for dfa, newstate, (symbol_number, nodes) in reversed(stack):
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if grammar.number2symbol[symbol_number] == 'suite':
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# If only newline is in the suite, the suite is not valid, yet.
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return len(nodes) > 1
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# Not reaching a suite means that we're dealing with file_input levels
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# where there's no need for a valid statement in it. It can also be empty.
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return True
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def _is_flow_node(node):
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try:
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value = node.children[0].value
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except AttributeError:
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return False
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return value in ('if', 'for', 'while', 'try')
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def _last_leaf_is_newline(last_leaf):
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if last_leaf.prefix.endswith('\n'):
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return True
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if last_leaf.prefix:
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return False
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previous_leaf = last_leaf.get_previous_leaf()
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return (previous_leaf.type == 'newline' or
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previous_leaf.type == 'error_leaf' and
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previous_leaf.original_type == 'newline')
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def _update_positions(nodes, line_offset):
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for node in nodes:
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try:
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children = node.children
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except AttributeError:
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# Is a leaf
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node.start_pos = node.start_pos[0] + line_offset, node.start_pos[1]
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else:
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_update_positions(children, line_offset)
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class DiffParser(object):
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endmarker_type = 'endmarker'
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def __init__(self, parser):
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self._parser = parser
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self._grammar = self._parser._grammar
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self._old_module = parser.get_root_node()
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def _reset(self):
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self._copy_count = 0
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self._parser_count = 0
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self._parsed_until_line = 0
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self._copied_ranges = []
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self._old_children = self._old_module.children
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self._new_children = []
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self._new_module = Module(self._new_children)
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self._new_module.path = self._old_module.path
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self._new_module.used_names = {}
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self._prefix = ''
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self._last_prefix = ''
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def update(self, lines_new):
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'''
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The algorithm works as follows:
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Equal:
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- Assure that the start is a newline, otherwise parse until we get
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one.
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- Copy from parsed_until_line + 1 to max(i2 + 1)
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- Make sure that the indentation is correct (e.g. add DEDENT)
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- Add old and change positions
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Insert:
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- Parse from parsed_until_line + 1 to min(j2 + 1), hopefully not
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much more.
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Always:
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- Set parsed_until_line
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Returns the new module node.
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'''
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self._parser_lines_new = lines_new
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self._added_newline = False
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if lines_new[-1] != '':
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# The Python grammar needs a newline at the end of a file, but for
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# everything else we keep working with lines_new here.
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self._parser_lines_new = list(lines_new)
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self._parser_lines_new[-1] += '\n'
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self._added_newline = True
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self._reset()
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line_length = len(lines_new)
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lines_old = splitlines(self._parser.source, keepends=True)
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sm = difflib.SequenceMatcher(None, lines_old, self._parser_lines_new)
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debug.dbg('diff: line_lengths old: %s, new: %s' % (len(lines_old), line_length))
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for operation, i1, i2, j1, j2 in sm.get_opcodes():
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debug.dbg('diff %s old[%s:%s] new[%s:%s]',
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operation, i1 + 1, i2, j1 + 1, j2)
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if j2 == line_length + int(self._added_newline):
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# The empty part after the last newline is not relevant.
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j2 -= 1
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if operation == 'equal':
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line_offset = j1 - i1
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self._copy_from_old_parser(line_offset, i2, j2)
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elif operation == 'replace':
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self._parse(until_line=j2)
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elif operation == 'insert':
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self._parse(until_line=j2)
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else:
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assert operation == 'delete'
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# Cleanup (setting endmarker, used_names)
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self._cleanup()
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if self._added_newline:
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self._parser.module = self._parser._parsed = self._new_module
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self._parser.remove_last_newline()
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self._parsed_until_line -= 1
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self._parser.source = ''.join(lines_new)
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self._old_module = self._new_module
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assert self._new_module.end_pos[0] == line_length
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return self._new_module
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def _copy_from_old_parser(self, line_offset, until_line_old, until_line_new):
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while until_line_new > self._parsed_until_line:
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parsed_until_line_old = self._parsed_until_line - line_offset
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line_stmt = self._get_old_line_stmt(parsed_until_line_old + 1)
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if line_stmt is None:
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# Parse 1 line at least. We don't need more, because we just
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# want to get into a state where the old parser has statements
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# again that can be copied (e.g. not lines within parentheses).
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self._parse(self._parsed_until_line + 1)
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else:
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p_children = line_stmt.parent.children
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index = p_children.index(line_stmt)
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# Match all the nodes that are in the wanted range.
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nodes = self._divide_nodes(p_children[index:], until_line_old)
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if nodes:
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self._copy_count += 1
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_update_positions(nodes, line_offset)
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self._insert_nodes(nodes)
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from_ = nodes[0].get_start_pos_of_prefix()[0]
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to = _get_last_line(nodes[-1])
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self._copied_ranges.append((from_, to))
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debug.dbg('diff actually copy %s to %s', from_, to)
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# We have copied as much as possible (but definitely not too
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# much). Therefore we just parse the rest.
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# We might not reach the end, because there's a statement
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# that is not finished.
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self._parse(until_line_new)
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break
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def _get_old_line_stmt(self, old_line):
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leaf = self._old_module.get_leaf_for_position((old_line, 0), include_prefixes=True)
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if leaf.type == 'newline':
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leaf = leaf.get_next_leaf()
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if leaf.get_start_pos_of_prefix()[0] == old_line:
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node = leaf
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# TODO use leaf.get_definition one day when that one is working
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# well.
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while node.parent.type not in ('file_input', 'suite'):
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node = node.parent
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return node
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# Must be on the same line. Otherwise we need to parse that bit.
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return None
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def _insert_nodes(self, nodes):
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"""
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Returns the scope that a node is a part of.
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"""
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# Needs to be done before resetting the parsed
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before_node = self._get_before_insertion_node()
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last_leaf = nodes[-1].last_leaf()
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is_endmarker = last_leaf.type == self.endmarker_type
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self._last_prefix = ''
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if is_endmarker:
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self._parsed_until_line = last_leaf.start_pos[0]
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try:
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separation = last_leaf.prefix.rindex('\n')
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except ValueError:
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pass
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else:
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# Remove the whitespace part of the prefix after a newline.
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# That is not relevant if parentheses were opened. Always parse
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# until the end of a line.
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last_leaf.prefix, self._last_prefix = \
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last_leaf.prefix[:separation + 1], last_leaf.prefix[separation + 1:]
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if _last_leaf_is_newline(last_leaf):
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self._parsed_until_line -= 1
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else:
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if last_leaf.type == 'newline':
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# Newlines end on the next line, which means that they would cover
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# the next line. That line is not fully parsed at this point.
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self._parsed_until_line = last_leaf.start_pos[0]
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else:
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self._parsed_until_line = last_leaf.end_pos[0]
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debug.dbg('set parsed_until %s', self._parsed_until_line)
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first_leaf = nodes[0].first_leaf()
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first_leaf.prefix = self._prefix + first_leaf.prefix
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self._prefix = ''
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if is_endmarker:
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self._prefix = last_leaf.prefix
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nodes = nodes[:-1]
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if not nodes:
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return self._new_module
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# Now the preparations are done. We are inserting the nodes.
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if before_node is None: # Everything is empty.
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self._new_children += nodes
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new_parent = self._new_module
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else:
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assert nodes[0].type != 'newline'
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line_indentation = nodes[0].start_pos[1]
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new_parent = before_node.parent
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while True:
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p_children = new_parent.children
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if new_parent.type == 'suite':
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# A suite starts with NEWLINE, ...
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indentation = p_children[1].start_pos[1]
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else:
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indentation = p_children[0].start_pos[1]
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if line_indentation < indentation: # Dedent
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# We might be at the most outer layer: modules. We
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# don't want to depend on the first statement
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# having the right indentation.
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if new_parent.parent is not None:
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new_parent = search_ancestor(
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new_parent,
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('suite', 'file_input')
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)
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continue
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p_children += nodes
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assert new_parent.type in ('suite', 'file_input')
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break
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# Reset the parents
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for node in nodes:
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node.parent = new_parent
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if new_parent.type == 'suite':
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return new_parent.get_parent_scope()
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return new_parent
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def _get_before_insertion_node(self):
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if not self._new_children:
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return None
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line = self._parsed_until_line + 1
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node = self._new_module.last_leaf()
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while True:
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parent = node.parent
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if parent.type in ('suite', 'file_input'):
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assert node.end_pos[0] <= line
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assert node.end_pos[1] == 0 or '\n' in self._prefix
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return node
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node = parent
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def _divide_node(self, node, until_line):
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if node.type not in ('classdef', 'funcdef'):
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return None
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suite = node.children[-1]
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if suite.type != 'suite':
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return None
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nodes = self._divide_nodes(suite.children, until_line)
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if len(nodes) < 2:
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# A suite only with newline is not valid.
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return None
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new_node = copy.copy(node)
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new_suite = copy.copy(suite)
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# And now set the correct parents
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for child in nodes:
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child.parent = new_suite
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new_suite.children = nodes
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new_node.children = list(new_node.children)
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new_node.children[-1] = new_suite
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for child in new_node.children:
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child.parent = new_node
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return new_node
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def _copy_divided_nodes(self, nodes):
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parent = nodes[-1].last_leaf().get_parent_scope()
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if parent == nodes[0].get_parent_scope():
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check_nodes = nodes
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else:
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n = parent
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while n is not None:
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if isinstance(n, Flow):
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parent = n.get_parent_scope()
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n = n.parent
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check_nodes = parent.children
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last_node = check_nodes[-1]
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if last_node.type == 'suite':
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parent = last_node
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check_nodes = parent.children
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last_node = check_nodes[-1]
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drop_node_count = 0
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if last_node.type in ('error_leaf', 'error_node') or _is_flow_node(last_node):
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# Error leafs/nodes don't have a defined start/end. Error
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# nodes might not end with a newline (e.g. if there's an
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# open `(`). Therefore ignore all of them unless they are
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# succeeded with valid parser state.
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# If we copy flows at the end, they might be continued
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# after the copy limit (in the new parser).
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n = last_node
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# In this while loop we try to remove until we find a newline.
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while True:
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drop_node_count += 1
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try:
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n = check_nodes[-drop_node_count - 1]
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except IndexError:
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break
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if n.last_leaf().type == 'newline':
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break
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if drop_node_count:
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node = self._drop_last_node(nodes[-1], last_node, drop_node_count)
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if node is None:
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nodes = nodes[:-drop_node_count]
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else:
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nodes[-1] = node
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return nodes
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def _drop_last_node(self, base_node, last_node_to_drop, drop_node_count):
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if base_node == last_node_to_drop:
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return None
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last_node = base_node.children[-1]
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child = self._drop_last_node(last_node, last_node_to_drop, drop_node_count)
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base_node = copy.copy(base_node)
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if child is None:
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if base_node.type == 'suite' and len(base_node.children) <= 1 + drop_node_count:
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return None
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if base_node.type in ('classdef', 'funcdef'):
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return None
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base_node.children = base_node.children[:-drop_node_count]
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else:
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base_node.children = list(base_node.children)
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base_node.children[-1] = child
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child.parent = base_node
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for c in base_node.children:
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c.parent = base_node
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return base_node
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def _divide_nodes(self, nodes, until_line):
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"""
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Breaks up scopes and returns only the part until the given line.
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Tries to get the parts it can safely get and ignores the rest.
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"""
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new_nodes = []
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for i, child in enumerate(nodes):
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# TODO this check might take a bit of time for large files. We
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# might want to change this to do more intelligent guessing or
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# binary search.
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if _get_last_line(child) > until_line:
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node = self._divide_node(child, until_line)
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if node is not None:
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new_nodes.append(node)
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break
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else:
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new_nodes.append(child)
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if new_nodes:
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return self._copy_divided_nodes(new_nodes)
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return new_nodes
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def _parse(self, until_line):
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"""
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Parses at least until the given line, but might just parse more until a
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valid state is reached.
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"""
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while until_line > self._parsed_until_line:
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node = self._try_parse_part(until_line)
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nodes = self._get_children_nodes(node)
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self._insert_nodes(nodes)
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_merge_used_names(
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self._new_module.used_names,
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node.used_names
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)
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def _get_children_nodes(self, node):
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nodes = node.children
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first_element = nodes[0]
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# TODO this looks very strange...
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if first_element.type == 'error_leaf' and \
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first_element.original_type == 'indent':
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assert False, str(nodes)
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#assert nodes[-1].type == 'dedent'
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## This means that the start and end leaf
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#nodes = nodes[1:-1] + [nodes[-1]]
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return nodes
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def _try_parse_part(self, until_line):
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"""
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Sets up a normal parser that uses a spezialized tokenizer to only parse
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until a certain position (or a bit longer if the statement hasn't
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ended.
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"""
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self._parser_count += 1
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# TODO speed up, shouldn't copy the whole list all the time.
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# memoryview?
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lines_after = self._parser_lines_new[self._parsed_until_line:]
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#print('parse_content', self._parsed_until_line, lines_after, until_line)
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tokenizer = self._diff_tokenize(
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lines_after,
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until_line,
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line_offset=self._parsed_until_line
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)
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self._active_parser = ParserWithRecovery(
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self._grammar,
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source='\n',
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start_parsing=False
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)
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return self._active_parser.parse(tokenizer=tokenizer)
|
|
|
|
def _cleanup(self):
|
|
"""Add used names and an end marker."""
|
|
# Add the used names from the old parser to the new one.
|
|
copied_line_numbers = set()
|
|
for l1, l2 in self._copied_ranges:
|
|
copied_line_numbers.update(range(l1, l2 + 1))
|
|
|
|
new_used_names = self._new_module.used_names
|
|
for key, names in self._old_module.used_names.items():
|
|
for name in names:
|
|
if name.start_pos[0] in copied_line_numbers:
|
|
new_used_names.setdefault(key, []).append(name)
|
|
|
|
# Add an endmarker.
|
|
try:
|
|
last_leaf = self._new_module.last_leaf()
|
|
end_pos = list(last_leaf.end_pos)
|
|
except IndexError:
|
|
end_pos = [1, 0]
|
|
lines = splitlines(self._prefix)
|
|
assert len(lines) > 0
|
|
if len(lines) == 1:
|
|
end_pos[1] += len(lines[0])
|
|
else:
|
|
end_pos[0] += len(lines) - 1
|
|
end_pos[1] = len(lines[-1])
|
|
|
|
endmarker = EndMarker('', tuple(end_pos), self._prefix + self._last_prefix)
|
|
endmarker.parent = self._new_module
|
|
self._new_children.append(endmarker)
|
|
|
|
def _diff_tokenize(self, lines, until_line, line_offset=0):
|
|
is_first_token = True
|
|
omitted_first_indent = False
|
|
indents = []
|
|
l = iter(lines)
|
|
tokens = generate_tokens(lambda: next(l, ''), use_exact_op_types=True)
|
|
stack = self._active_parser.pgen_parser.stack
|
|
for typ, string, start_pos, prefix in tokens:
|
|
start_pos = start_pos[0] + line_offset, start_pos[1]
|
|
if typ == INDENT:
|
|
indents.append(start_pos[1])
|
|
if is_first_token:
|
|
omitted_first_indent = True
|
|
# We want to get rid of indents that are only here because
|
|
# we only parse part of the file. These indents would only
|
|
# get parsed as error leafs, which doesn't make any sense.
|
|
is_first_token = False
|
|
continue
|
|
is_first_token = False
|
|
|
|
if typ == DEDENT:
|
|
indents.pop()
|
|
if omitted_first_indent and not indents:
|
|
# We are done here, only thing that can come now is an
|
|
# endmarker or another dedented code block.
|
|
typ, string, start_pos, prefix = next(tokens)
|
|
if '\n' in prefix:
|
|
prefix = re.sub(r'(<=\n)[^\n]+$', '', prefix)
|
|
else:
|
|
prefix = ''
|
|
yield TokenInfo(ENDMARKER, '', (start_pos[0] + line_offset, 0), prefix)
|
|
break
|
|
elif typ == NEWLINE and start_pos[0] >= until_line:
|
|
yield TokenInfo(typ, string, start_pos, prefix)
|
|
# Check if the parser is actually in a valid suite state.
|
|
if suite_or_file_input_is_valid(self._grammar, stack):
|
|
start_pos = start_pos[0] + 1, 0
|
|
while len(indents) > int(omitted_first_indent):
|
|
indents.pop()
|
|
yield TokenInfo(DEDENT, '', start_pos, '')
|
|
|
|
yield TokenInfo(ENDMARKER, '', start_pos, '')
|
|
break
|
|
else:
|
|
continue
|
|
|
|
yield TokenInfo(typ, string, start_pos, prefix)
|