85 lines
2.1 KiB
Python
85 lines
2.1 KiB
Python
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#!/usr/bin/env python
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# encoding: utf-8
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"""Utilities to deal with text."""
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def unescape(text):
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"""Removes '\\' escaping from 'text'."""
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rv = ''
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i = 0
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while i < len(text):
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if i + 1 < len(text) and text[i] == '\\':
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rv += text[i + 1]
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i += 1
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else:
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rv += text[i]
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i += 1
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return rv
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def escape(text, chars):
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"""Escapes all characters in 'chars' in text using backspaces."""
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rv = ''
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for char in text:
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if char in chars:
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rv += '\\'
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rv += char
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return rv
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def fill_in_whitespace(text):
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"""Returns 'text' with escaped whitespace replaced through whitespaces."""
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text = text.replace(r"\n", '\n')
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text = text.replace(r"\t", '\t')
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text = text.replace(r"\r", '\r')
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text = text.replace(r"\a", '\a')
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text = text.replace(r"\b", '\b')
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return text
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def head_tail(line):
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"""Returns the first word in 'line' and the rest of 'line' or None if the
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line is too short."""
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generator = (t.strip() for t in line.split(None, 1))
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head = next(generator).strip()
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tail = ''
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try:
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tail = next(generator).strip()
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except StopIteration:
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pass
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return head, tail
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class LineIterator(object):
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"""Convenience class that keeps track of line numbers in files."""
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def __init__(self, text):
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self._line_index = -1
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self._lines = list(text.splitlines(True))
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def __iter__(self):
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return self
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def __next__(self):
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"""Returns the next line."""
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if self._line_index + 1 < len(self._lines):
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self._line_index += 1
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return self._lines[self._line_index]
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raise StopIteration()
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next = __next__ # for python2
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@property
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def line_index(self):
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"""The 1 based line index in the current file."""
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return self._line_index + 1
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def peek(self):
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"""Returns the next line (if there is any, otherwise None) without
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advancing the iterator."""
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try:
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return self._lines[self._line_index + 1]
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except IndexError:
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return None
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