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"""Input transformer machinery to support IPython special syntax.
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This includes the machinery to recognise and transform ``%magic`` commands,
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``!system`` commands, ``help?`` querying, prompt stripping, and so forth.
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"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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from codeop import compile_command
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import re
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import tokenize
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from typing import List, Tuple
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_indent_re = re.compile(r'^[ \t]+')
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def leading_indent(lines):
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"""Remove leading indentation.
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If the first line starts with a spaces or tabs, the same whitespace will be
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removed from each following line.
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"""
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m = _indent_re.match(lines[0])
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if not m:
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return lines
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space = m.group(0)
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n = len(space)
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return [l[n:] if l.startswith(space) else l
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for l in lines]
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class PromptStripper:
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"""Remove matching input prompts from a block of input.
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Parameters
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----------
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prompt_re : regular expression
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A regular expression matching any input prompt (including continuation)
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initial_re : regular expression, optional
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A regular expression matching only the initial prompt, but not continuation.
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If no initial expression is given, prompt_re will be used everywhere.
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Used mainly for plain Python prompts, where the continuation prompt
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``...`` is a valid Python expression in Python 3, so shouldn't be stripped.
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If initial_re and prompt_re differ,
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only initial_re will be tested against the first line.
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If any prompt is found on the first two lines,
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prompts will be stripped from the rest of the block.
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"""
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def __init__(self, prompt_re, initial_re=None):
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self.prompt_re = prompt_re
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self.initial_re = initial_re or prompt_re
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def _strip(self, lines):
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return [self.prompt_re.sub('', l, count=1) for l in lines]
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def __call__(self, lines):
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if self.initial_re.match(lines[0]) or \
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(len(lines) > 1 and self.prompt_re.match(lines[1])):
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return self._strip(lines)
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return lines
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classic_prompt = PromptStripper(
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prompt_re=re.compile(r'^(>>>|\.\.\.)( |$)'),
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initial_re=re.compile(r'^>>>( |$)')
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)
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ipython_prompt = PromptStripper(re.compile(r'^(In \[\d+\]: |\s*\.{3,}: ?)'))
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def cell_magic(lines):
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if not lines[0].startswith('%%'):
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return lines
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if re.match('%%\w+\?', lines[0]):
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# This case will be handled by help_end
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return lines
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magic_name, _, first_line = lines[0][2:-1].partition(' ')
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body = ''.join(lines[1:])
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return ['get_ipython().run_cell_magic(%r, %r, %r)\n'
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% (magic_name, first_line, body)]
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# -----
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def _find_assign_op(token_line):
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# Find the first assignment in the line ('=' not inside brackets)
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# We don't try to support multiple special assignment (a = b = %foo)
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paren_level = 0
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for i, ti in enumerate(token_line):
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s = ti.string
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if s == '=' and paren_level == 0:
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return i
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if s in '([{':
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paren_level += 1
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elif s in ')]}':
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paren_level -= 1
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def find_end_of_continued_line(lines, start_line: int):
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"""Find the last line of a line explicitly extended using backslashes.
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Uses 0-indexed line numbers.
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"""
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end_line = start_line
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while lines[end_line].endswith('\\\n'):
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end_line += 1
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if end_line >= len(lines):
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break
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return end_line
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def assemble_continued_line(lines, start: Tuple[int, int], end_line: int):
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"""Assemble pieces of a continued line into a single line.
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Uses 0-indexed line numbers. *start* is (lineno, colno).
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"""
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parts = [lines[start[0]][start[1]:]] + lines[start[0]+1:end_line+1]
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return ' '.join([p[:-2] for p in parts[:-1]] # Strip backslash+newline
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+ [parts[-1][:-1]]) # Strip newline from last line
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class TokenTransformBase:
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# Lower numbers -> higher priority (for matches in the same location)
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priority = 10
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def sortby(self):
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return self.start_line, self.start_col, self.priority
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def __init__(self, start):
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self.start_line = start[0] - 1 # Shift from 1-index to 0-index
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self.start_col = start[1]
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def transform(self, lines: List[str]):
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raise NotImplementedError
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class MagicAssign(TokenTransformBase):
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@classmethod
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def find(cls, tokens_by_line):
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"""Find the first magic assignment (a = %foo) in the cell.
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Returns (line, column) of the % if found, or None. *line* is 1-indexed.
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"""
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for line in tokens_by_line:
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assign_ix = _find_assign_op(line)
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if (assign_ix is not None) \
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and (len(line) >= assign_ix + 2) \
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and (line[assign_ix+1].string == '%') \
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and (line[assign_ix+2].type == tokenize.NAME):
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return cls(line[assign_ix+1].start)
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def transform(self, lines: List[str]):
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"""Transform a magic assignment found by find
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"""
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start_line, start_col = self.start_line, self.start_col
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lhs = lines[start_line][:start_col]
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end_line = find_end_of_continued_line(lines, start_line)
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rhs = assemble_continued_line(lines, (start_line, start_col), end_line)
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assert rhs.startswith('%'), rhs
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magic_name, _, args = rhs[1:].partition(' ')
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lines_before = lines[:start_line]
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call = "get_ipython().run_line_magic({!r}, {!r})".format(magic_name, args)
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new_line = lhs + call + '\n'
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lines_after = lines[end_line+1:]
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return lines_before + [new_line] + lines_after
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class SystemAssign(TokenTransformBase):
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@classmethod
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def find(cls, tokens_by_line):
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"""Find the first system assignment (a = !foo) in the cell.
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Returns (line, column) of the ! if found, or None. *line* is 1-indexed.
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"""
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for line in tokens_by_line:
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assign_ix = _find_assign_op(line)
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if (assign_ix is not None) \
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and (len(line) >= assign_ix + 2) \
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and (line[assign_ix + 1].type == tokenize.ERRORTOKEN):
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ix = assign_ix + 1
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while ix < len(line) and line[ix].type == tokenize.ERRORTOKEN:
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if line[ix].string == '!':
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return cls(line[ix].start)
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elif not line[ix].string.isspace():
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break
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ix += 1
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def transform(self, lines: List[str]):
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"""Transform a system assignment found by find
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"""
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start_line, start_col = self.start_line, self.start_col
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lhs = lines[start_line][:start_col]
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end_line = find_end_of_continued_line(lines, start_line)
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rhs = assemble_continued_line(lines, (start_line, start_col), end_line)
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assert rhs.startswith('!'), rhs
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cmd = rhs[1:]
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lines_before = lines[:start_line]
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call = "get_ipython().getoutput({!r})".format(cmd)
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new_line = lhs + call + '\n'
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lines_after = lines[end_line + 1:]
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return lines_before + [new_line] + lines_after
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# The escape sequences that define the syntax transformations IPython will
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# apply to user input. These can NOT be just changed here: many regular
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# expressions and other parts of the code may use their hardcoded values, and
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# for all intents and purposes they constitute the 'IPython syntax', so they
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# should be considered fixed.
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ESC_SHELL = '!' # Send line to underlying system shell
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ESC_SH_CAP = '!!' # Send line to system shell and capture output
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ESC_HELP = '?' # Find information about object
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ESC_HELP2 = '??' # Find extra-detailed information about object
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ESC_MAGIC = '%' # Call magic function
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ESC_MAGIC2 = '%%' # Call cell-magic function
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ESC_QUOTE = ',' # Split args on whitespace, quote each as string and call
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ESC_QUOTE2 = ';' # Quote all args as a single string, call
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ESC_PAREN = '/' # Call first argument with rest of line as arguments
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ESCAPE_SINGLES = {'!', '?', '%', ',', ';', '/'}
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ESCAPE_DOUBLES = {'!!', '??'} # %% (cell magic) is handled separately
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def _make_help_call(target, esc, next_input=None):
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"""Prepares a pinfo(2)/psearch call from a target name and the escape
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(i.e. ? or ??)"""
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method = 'pinfo2' if esc == '??' \
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else 'psearch' if '*' in target \
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else 'pinfo'
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arg = " ".join([method, target])
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#Prepare arguments for get_ipython().run_line_magic(magic_name, magic_args)
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t_magic_name, _, t_magic_arg_s = arg.partition(' ')
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t_magic_name = t_magic_name.lstrip(ESC_MAGIC)
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if next_input is None:
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return 'get_ipython().run_line_magic(%r, %r)' % (t_magic_name, t_magic_arg_s)
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else:
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return 'get_ipython().set_next_input(%r);get_ipython().run_line_magic(%r, %r)' % \
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(next_input, t_magic_name, t_magic_arg_s)
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def _tr_help(content):
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"Translate lines escaped with: ?"
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# A naked help line should just fire the intro help screen
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if not content:
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return 'get_ipython().show_usage()'
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return _make_help_call(content, '?')
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def _tr_help2(content):
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"Translate lines escaped with: ??"
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# A naked help line should just fire the intro help screen
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if not content:
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return 'get_ipython().show_usage()'
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return _make_help_call(content, '??')
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def _tr_magic(content):
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"Translate lines escaped with: %"
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name, _, args = content.partition(' ')
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return 'get_ipython().run_line_magic(%r, %r)' % (name, args)
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def _tr_quote(content):
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"Translate lines escaped with: ,"
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name, _, args = content.partition(' ')
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return '%s("%s")' % (name, '", "'.join(args.split()) )
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def _tr_quote2(content):
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"Translate lines escaped with: ;"
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name, _, args = content.partition(' ')
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return '%s("%s")' % (name, args)
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def _tr_paren(content):
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"Translate lines escaped with: /"
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name, _, args = content.partition(' ')
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return '%s(%s)' % (name, ", ".join(args.split()))
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tr = { ESC_SHELL : 'get_ipython().system({!r})'.format,
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ESC_SH_CAP : 'get_ipython().getoutput({!r})'.format,
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ESC_HELP : _tr_help,
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ESC_HELP2 : _tr_help2,
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ESC_MAGIC : _tr_magic,
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ESC_QUOTE : _tr_quote,
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ESC_QUOTE2 : _tr_quote2,
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ESC_PAREN : _tr_paren }
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class EscapedCommand(TokenTransformBase):
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@classmethod
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def find(cls, tokens_by_line):
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"""Find the first escaped command (%foo, !foo, etc.) in the cell.
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Returns (line, column) of the escape if found, or None. *line* is 1-indexed.
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"""
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for line in tokens_by_line:
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ix = 0
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while line[ix].type in {tokenize.INDENT, tokenize.DEDENT}:
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ix += 1
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if line[ix].string in ESCAPE_SINGLES:
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return cls(line[ix].start)
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def transform(self, lines):
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start_line, start_col = self.start_line, self.start_col
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indent = lines[start_line][:start_col]
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end_line = find_end_of_continued_line(lines, start_line)
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line = assemble_continued_line(lines, (start_line, start_col), end_line)
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if line[:2] in ESCAPE_DOUBLES:
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escape, content = line[:2], line[2:]
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else:
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escape, content = line[:1], line[1:]
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call = tr[escape](content)
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lines_before = lines[:start_line]
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new_line = indent + call + '\n'
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lines_after = lines[end_line + 1:]
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return lines_before + [new_line] + lines_after
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_help_end_re = re.compile(r"""(%{0,2}
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[a-zA-Z_*][\w*]* # Variable name
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(\.[a-zA-Z_*][\w*]*)* # .etc.etc
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)
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(\?\??)$ # ? or ??
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""",
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re.VERBOSE)
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class HelpEnd(TokenTransformBase):
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# This needs to be higher priority (lower number) than EscapedCommand so
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# that inspecting magics (%foo?) works.
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priority = 5
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def __init__(self, start, q_locn):
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super().__init__(start)
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self.q_line = q_locn[0] - 1 # Shift from 1-indexed to 0-indexed
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self.q_col = q_locn[1]
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@classmethod
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def find(cls, tokens_by_line):
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for line in tokens_by_line:
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# Last token is NEWLINE; look at last but one
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if len(line) > 2 and line[-2].string == '?':
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# Find the first token that's not INDENT/DEDENT
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ix = 0
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while line[ix].type in {tokenize.INDENT, tokenize.DEDENT}:
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ix += 1
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return cls(line[ix].start, line[-2].start)
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def transform(self, lines):
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piece = ''.join(lines[self.start_line:self.q_line+1])
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indent, content = piece[:self.start_col], piece[self.start_col:]
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lines_before = lines[:self.start_line]
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lines_after = lines[self.q_line + 1:]
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m = _help_end_re.search(content)
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assert m is not None, content
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target = m.group(1)
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esc = m.group(3)
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# If we're mid-command, put it back on the next prompt for the user.
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next_input = None
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if (not lines_before) and (not lines_after) \
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and content.strip() != m.group(0):
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next_input = content.rstrip('?\n')
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call = _make_help_call(target, esc, next_input=next_input)
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new_line = indent + call + '\n'
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return lines_before + [new_line] + lines_after
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def make_tokens_by_line(lines):
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"""Tokenize a series of lines and group tokens by line.
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The tokens for a multiline Python string or expression are
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grouped as one line.
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"""
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# NL tokens are used inside multiline expressions, but also after blank
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# lines or comments. This is intentional - see https://bugs.python.org/issue17061
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# We want to group the former case together but split the latter, so we
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# track parentheses level, similar to the internals of tokenize.
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NEWLINE, NL = tokenize.NEWLINE, tokenize.NL
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tokens_by_line = [[]]
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parenlev = 0
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try:
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for token in tokenize.generate_tokens(iter(lines).__next__):
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tokens_by_line[-1].append(token)
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if (token.type == NEWLINE) \
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or ((token.type == NL) and (parenlev <= 0)):
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tokens_by_line.append([])
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elif token.string in {'(', '[', '{'}:
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parenlev += 1
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elif token.string in {')', ']', '}'}:
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parenlev -= 1
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except tokenize.TokenError:
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# Input ended in a multiline string or expression. That's OK for us.
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pass
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return tokens_by_line
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def show_linewise_tokens(s: str):
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"""For investigation"""
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if not s.endswith('\n'):
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s += '\n'
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lines = s.splitlines(keepends=True)
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for line in make_tokens_by_line(lines):
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print("Line -------")
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for tokinfo in line:
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print(" ", tokinfo)
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class TransformerManager:
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def __init__(self):
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self.cleanup_transforms = [
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leading_indent,
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classic_prompt,
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ipython_prompt,
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]
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self.line_transforms = [
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cell_magic,
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]
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self.token_transformers = [
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MagicAssign,
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SystemAssign,
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EscapedCommand,
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HelpEnd,
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]
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def do_one_token_transform(self, lines):
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"""Find and run the transform earliest in the code.
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Returns (changed, lines).
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This method is called repeatedly until changed is False, indicating
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that all available transformations are complete.
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|
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The tokens following IPython special syntax might not be valid, so
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|
the transformed code is retokenised every time to identify the next
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piece of special syntax. Hopefully long code cells are mostly valid
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Python, not using lots of IPython special syntax, so this shouldn't be
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a performance issue.
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"""
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tokens_by_line = make_tokens_by_line(lines)
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candidates = []
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for transformer_cls in self.token_transformers:
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transformer = transformer_cls.find(tokens_by_line)
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if transformer:
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candidates.append(transformer)
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if not candidates:
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# Nothing to transform
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return False, lines
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transformer = min(candidates, key=TokenTransformBase.sortby)
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return True, transformer.transform(lines)
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def do_token_transforms(self, lines):
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|
while True:
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changed, lines = self.do_one_token_transform(lines)
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|
if not changed:
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|
return lines
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|
|
def transform_cell(self, cell: str):
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|
if not cell.endswith('\n'):
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cell += '\n' # Ensure the cell has a trailing newline
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|
lines = cell.splitlines(keepends=True)
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|
for transform in self.cleanup_transforms + self.line_transforms:
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|
#print(transform, lines)
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|
lines = transform(lines)
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|
lines = self.do_token_transforms(lines)
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|
return ''.join(lines)
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|
|
def check_complete(self, cell: str):
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|
"""Return whether a block of code is ready to execute, or should be continued
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|
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|
|
Parameters
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|
----------
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|
source : string
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|
Python input code, which can be multiline.
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|
|
Returns
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|
-------
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|
status : str
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|
One of 'complete', 'incomplete', or 'invalid' if source is not a
|
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|
prefix of valid code.
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|
|
indent_spaces : int or None
|
|
|
The number of spaces by which to indent the next line of code. If
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|
|
status is not 'incomplete', this is None.
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|
"""
|
|
|
if not cell.endswith('\n'):
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|
cell += '\n' # Ensure the cell has a trailing newline
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|
lines = cell.splitlines(keepends=True)
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|
|
if lines[-1][:-1].endswith('\\'):
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|
|
# Explicit backslash continuation
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|
|
return 'incomplete', find_last_indent(lines)
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|
|
|
|
try:
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|
|
for transform in self.cleanup_transforms:
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|
lines = transform(lines)
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|
|
except SyntaxError:
|
|
|
return 'invalid', None
|
|
|
|
|
|
if lines[0].startswith('%%'):
|
|
|
# Special case for cell magics - completion marked by blank line
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|
|
if lines[-1].strip():
|
|
|
return 'incomplete', find_last_indent(lines)
|
|
|
else:
|
|
|
return 'complete', None
|
|
|
|
|
|
try:
|
|
|
for transform in self.line_transforms:
|
|
|
lines = transform(lines)
|
|
|
lines = self.do_token_transforms(lines)
|
|
|
except SyntaxError:
|
|
|
return 'invalid', None
|
|
|
|
|
|
tokens_by_line = make_tokens_by_line(lines)
|
|
|
if tokens_by_line[-1][-1].type != tokenize.ENDMARKER:
|
|
|
# We're in a multiline string or expression
|
|
|
return 'incomplete', find_last_indent(lines)
|
|
|
|
|
|
# Find the last token on the previous line that's not NEWLINE or COMMENT
|
|
|
toks_last_line = tokens_by_line[-2]
|
|
|
ix = len(toks_last_line) - 1
|
|
|
while ix >= 0 and toks_last_line[ix].type in {tokenize.NEWLINE,
|
|
|
tokenize.COMMENT}:
|
|
|
ix -= 1
|
|
|
|
|
|
if toks_last_line[ix].string == ':':
|
|
|
# The last line starts a block (e.g. 'if foo:')
|
|
|
ix = 0
|
|
|
while toks_last_line[ix].type in {tokenize.INDENT, tokenize.DEDENT}:
|
|
|
ix += 1
|
|
|
indent = toks_last_line[ix].start[1]
|
|
|
return 'incomplete', indent + 4
|
|
|
|
|
|
# If there's a blank line at the end, assume we're ready to execute.
|
|
|
if not lines[-1].strip():
|
|
|
return 'complete', None
|
|
|
|
|
|
# At this point, our checks think the code is complete (or invalid).
|
|
|
# We'll use codeop.compile_command to check this with the real parser.
|
|
|
|
|
|
try:
|
|
|
res = compile_command(''.join(lines), symbol='exec')
|
|
|
except (SyntaxError, OverflowError, ValueError, TypeError,
|
|
|
MemoryError, SyntaxWarning):
|
|
|
return 'invalid', None
|
|
|
else:
|
|
|
if res is None:
|
|
|
return 'incomplete', find_last_indent(lines)
|
|
|
return 'complete', None
|
|
|
|
|
|
|
|
|
def find_last_indent(lines):
|
|
|
m = _indent_re.match(lines[-1])
|
|
|
if not m:
|
|
|
return 0
|
|
|
return len(m.group(0).replace('\t', ' '*4))
|
|
|
|
