bpython/bpython/curtsiesfrontend/preprocess.py at 0.16-release · pythonthings/bpython · GitHub

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"""Tools for preparing code to be run in the REPL (removing blank lines,

etc)"""

from bpython.lazyre import LazyReCompile

# TODO specifically catch IndentationErrors instead of any syntax errors

indent_empty_lines_re = LazyReCompile(r'\s*')

tabs_to_spaces_re = LazyReCompile(r'^\t+')

def indent_empty_lines(s, compiler):

"""Indents blank lines that would otherwise cause early compilation

Only really works if starting on a new line"""

lines = s.split('\n')

ends_with_newline = False

if lines and not lines[-1]:

ends_with_newline = True

lines.pop()

result_lines = []

for p_line, line, n_line in zip([''] + lines[:-1], lines,

lines[1:] + ['']):

if len(line) == 0:

p_indent = indent_empty_lines_re.match(p_line).group()

n_indent = indent_empty_lines_re.match(n_line).group()

result_lines.append(min([p_indent, n_indent], key=len) + line)

else:

result_lines.append(line)

return '\n'.join(result_lines) + ('\n' if ends_with_newline else '')

def leading_tabs_to_spaces(s):

lines = s.split('\n')

result_lines = []

def tab_to_space(m):

return len(m.group()) * 4 * ' '

for line in lines:

result_lines.append(tabs_to_spaces_re.sub(tab_to_space, line))

return '\n'.join(result_lines)

def preprocess(s, compiler):

return indent_empty_lines(leading_tabs_to_spaces(s), compiler)

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