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aaronmk
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# String manipulation
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aaronmk
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import codecs
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861
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aaronmk
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import re
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1232
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aaronmk
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import util
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aaronmk
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##### Sentinel values
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class NonInternedStr(str):
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'''Each instance is unique and does not compare identical with `is`.'''
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pass
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none_str = NonInternedStr()
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4032
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isspace_none_str = '\r\n\t\v' # clone-safe, but must be compared with ==
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4028
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1622
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aaronmk
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##### Parsing
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4115
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def raw_extra_len(str_):
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'''Calculates the difference between the character length and byte length of
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a string. These lengths will differ for Unicode strings containing
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multi-byte characters.'''
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return len(to_raw_str(str_))-len(str_)
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def concat(str0, str1, max_len):
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'''Concatenates two strings, ensuring that the combined byte length is no
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greater than the provided length limit.
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Note that if the combined length is longer than max_len, the truncated
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length may sometimes be shorter than max_len if there are multi-byte
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characters after str0's truncation point. Thus, you *cannot determine if the
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string was truncated* by checking if the new length equals max_len.
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'''
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# Use raw_extra_len() because Unicode characters can be multi-byte, and
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# length limits often apply to the byte length, not the character length.
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max_len -= raw_extra_len(str0)+raw_extra_len(str1)
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str0_new_len = max_len - len(str1)
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if str0_new_len < 0: return str1[:max_len] # str1 too long
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return str0[:str0_new_len]+str1
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2932
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1622
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def split(sep, str_):
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'''Returns [] if str_ == ""'''
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if str_ == '': return []
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else: return str_.split(sep)
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4937
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def remove_prefix(prefix, str_, removed_ref=None, require=False):
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if removed_ref == None: removed_ref = [False]
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removed_ref[0] = str_.startswith(prefix)
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if removed_ref[0]: return str_[len(prefix):]
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elif require: raise Exception(urepr(str_)+' needs '+urepr(prefix)+' prefix')
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else: return str_
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def remove_prefixes(prefixes, str_):
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for prefix in prefixes: str_ = remove_prefix(prefix, str_)
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return str_
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def with_prefixes(prefixes, str_): return (p+str_ for p in prefixes)
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4937
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def remove_suffix(suffix, str_, removed_ref=None, require=False):
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2221
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if removed_ref == None: removed_ref = [False]
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removed_ref[0] = str_.endswith(suffix)
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if removed_ref[0]: return str_[:-len(suffix)]
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elif require: raise Exception(urepr(str_)+' needs '+urepr(suffix)+' suffix')
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else: return str_
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def find_any(haystack, needles):
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for needle in needles:
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if haystack.find(needle) >= 0: return needle
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return None
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1959
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1622
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def overlaps(str0, str1): return str0.find(str1) >= 0 or str1.find(str0) >= 0
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def flip_map(map_):
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'''
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For use with replace_all(), replace_all_re().
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@param map_ [(from_, to), ...]
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@return [(to, from_), ...]
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'''
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return [(to, from_) for from_, to in map_]
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def replace_all(map_, str_):
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'''
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@param map_ [(from_, to), ...]
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'''
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for from_, to in map_: str_ = str_.replace(from_, to)
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return str_
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def replace_all_re(map_, str_):
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'''
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@param map_ [(from_, to), ...]
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'''
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for from_, to in map_: str_ = re.sub(from_, to, str_)
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return str_
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2761
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aaronmk
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##### Escaping
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5142
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def esc_quotes(str_, quote='"', esc='\\', quote_esc=None):
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if quote_esc == None: quote_esc = esc+quote
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if esc != quote: str_ = str_.replace(esc, esc+esc)
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str_ = str_.replace(quote, quote_esc)
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return str_
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5161
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aaronmk
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json_encode_map = [
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('\n', r'\n'),
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('\r', r'\r'),
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]
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5143
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aaronmk
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5161
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aaronmk
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def json_encode(str_):
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return replace_all(json_encode_map, esc_quotes(str_, '"'))
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2761
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aaronmk
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def esc_for_mogrify(query):
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'''Escapes a query right before being passed to a mogrifying function.'''
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return query.replace('%', '%%')
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5148
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aaronmk
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def regexp_repl_esc(str_): return lambda m: str_
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1401
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aaronmk
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##### Unicode
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def to_raw_str(str_):
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if isinstance(str_, unicode): str_ = str_.encode('utf_8')
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return str_
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1295
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aaronmk
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unicode_reader = codecs.getreader('utf_8')
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73
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aaronmk
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def to_unicode(str_):
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if isinstance(str_, unicode): return str_
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encodings = ['utf_8', 'latin_1']
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for encoding in encodings:
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try: return unicode(str_, encoding)
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except UnicodeDecodeError, e: pass
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raise AssertionError(encoding+' is not a catch-all encoding')
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340
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aaronmk
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3748
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aaronmk
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def ustr(value):
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1232
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'''Like built-in str() but converts to unicode object'''
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3748
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if util.is_str(value): str_ = value # already a string
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elif hasattr(value, '__str__'): str_ = value.__str__()
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else: str_ = str(value)
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return to_unicode(str_)
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1232
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aaronmk
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3747
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def urepr(value):
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'''Like built-in repr() but converts to unicode object'''
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if hasattr(value, '__repr__'): str_ = value.__repr__()
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else: str_ = repr(value)
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return to_unicode(str_)
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2502
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aaronmk
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def repr_no_u(value):
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'''Like built-in repr() but removes the "u" in `u'...'`'''
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3747
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aaronmk
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return re.sub(r"^u(?=')", r'', urepr(value))
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2502
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aaronmk
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1401
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aaronmk
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##### Line endings
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1622
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aaronmk
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def extract_line_ending(line):
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'''@return tuple (contents, ending)'''
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contents = remove_suffix('\r', remove_suffix('\n', line))
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return (contents, line[len(contents):])
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714
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aaronmk
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1622
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aaronmk
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def remove_line_ending(line): return extract_line_ending(line)[0]
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def ensure_newl(str_): return remove_line_ending(str_)+'\n'
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856
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aaronmk
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def is_multiline(str_):
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newl_idx = str_.find('\n')
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return newl_idx >= 0 and newl_idx != len(str_)-1 # has newline before end
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860
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aaronmk
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def remove_extra_newl(str_):
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856
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aaronmk
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if is_multiline(str_): return str_
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2480
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else: return str_.rstrip('\n')
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856
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aaronmk
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714
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aaronmk
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def std_newl(str_): return str_.replace('\r\n', '\n').replace('\r', '\n')
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3255
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aaronmk
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def join_lines(lines): return ''.join((l+'\n' for l in lines))
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1401
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aaronmk
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##### Whitespace
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714
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aaronmk
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def cleanup(str_): return std_newl(str_.strip())
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861
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aaronmk
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1364
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def single_space(str_): return re.sub(r' {2,}', r' ', str_.strip())
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861
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aaronmk
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def one_line(str_): return re.sub(r'\n *', r' ', cleanup(str_))
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1761
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aaronmk
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##### Control characters
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def is_ctrl(char):
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'''Whether char is a (non-printable) control character'''
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return ord(char) < 32 and not char.isspace()
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def strip_ctrl(str_):
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'''Strips (non-printable) control characters'''
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return ''.join(filter(lambda c: not is_ctrl(c), str_))
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2471
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aaronmk
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3172
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aaronmk
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##### Text
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def first_word(str_): return str_.partition(' ')[0]
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2471
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aaronmk
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##### Formatting
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aaronmk
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def indent(str_, level=1, indent_str=' '):
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indent_str *= level
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return ('\n'.join((indent_str+l for l in str_.rstrip().split('\n'))))+'\n'
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2477
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aaronmk
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def as_tt(str_): return '@'+str_+'@'
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2475
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aaronmk
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def as_code(str_, lang=None, multiline=True):
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2471
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aaronmk
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'''Wraps a string in Redmine tags to syntax-highlight it.'''
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2480
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aaronmk
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str_ = '\n'+str_.rstrip('\n')+'\n'
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2471
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aaronmk
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if lang != None: str_ = '<code class="'+lang+'">'+str_+'</code>'
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2475
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aaronmk
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if multiline: str_ = '<pre>'+str_+'</pre>'
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return str_
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2477
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aaronmk
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2504
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aaronmk
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def as_inline_table(dict_, key_label='Output', value_label='Input', ustr=ustr):
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2477
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aaronmk
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'''Wraps a dict in Redmine tags to format it as a table.'''
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str_ = ''
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2481
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aaronmk
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def row(entry): return (': '.join(entry))+'\n'
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2477
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aaronmk
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str_ += row([key_label, value_label])
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2481
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aaronmk
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for entry in dict_.iteritems(): str_ += row([ustr(v) for v in entry])
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return '<pre>\n'+str_+'</pre>'
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2482
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aaronmk
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2504
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aaronmk
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def as_table(dict_, key_label='Output', value_label='Input', ustr=ustr):
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2482
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aaronmk
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'''Wraps a dict in Redmine tags to format it as a table.'''
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str_ = ''
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def row(entry): return ('|'.join(['']+entry+['']))+'\n'# '' for outer border
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str_ += row([key_label, value_label])
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for entry in dict_.iteritems(): str_ += row([as_tt(ustr(v)) for v in entry])
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return '\n'+str_+' ' # space protects last \n so blank line ends table
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