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#!/usr/bin/python # -*- coding: utf-8 -*- # # Urwid utility functions # Copyright (C) 2004-2011 Ian Ward # # This library is free software; you can redistribute it and/or # modify it under the terms of the GNU Lesser General Public # License as published by the Free Software Foundation; either # version 2.1 of the License, or (at your option) any later version. # # This library is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU # Lesser General Public License for more details. # # You should have received a copy of the GNU Lesser General Public # License along with this library; if not, write to the Free Software # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA # # Urwid web site: http://excess.org/urwid/ from __future__ import division, print_function from urwid import escape from urwid.compat import bytes, text_type, text_types import codecs str_util = escape.str_util # bring str_util functions into our namespace calc_text_pos = str_util.calc_text_pos calc_width = str_util.calc_width is_wide_char = str_util.is_wide_char move_next_char = str_util.move_next_char move_prev_char = str_util.move_prev_char within_double_byte = str_util.within_double_byte def detect_encoding(): # Try to determine if using a supported double-byte encoding import locale try: try: locale.setlocale(locale.LC_ALL, "") except locale.Error: pass return locale.getlocale()[1] or "" except ValueError as e: # with invalid LANG value python will throw ValueError if e.args and e.args[0].startswith("unknown locale"): return "" else: raise if 'detected_encoding' not in locals(): detected_encoding = detect_encoding() else: assert 0, "It worked!" _target_encoding = None _use_dec_special = True def set_encoding( encoding ): """ Set the byte encoding to assume when processing strings and the encoding to use when converting unicode strings. """ encoding = encoding.lower() global _target_encoding, _use_dec_special if encoding in ( 'utf-8', 'utf8', 'utf' ): str_util.set_byte_encoding("utf8") _use_dec_special = False elif encoding in ( 'euc-jp' # JISX 0208 only , 'euc-kr', 'euc-cn', 'euc-tw' # CNS 11643 plain 1 only , 'gb2312', 'gbk', 'big5', 'cn-gb', 'uhc' # these shouldn't happen, should they? , 'eucjp', 'euckr', 'euccn', 'euctw', 'cncb' ): str_util.set_byte_encoding("wide") _use_dec_special = True else: str_util.set_byte_encoding("narrow") _use_dec_special = True # if encoding is valid for conversion from unicode, remember it _target_encoding = 'ascii' try: if encoding: u"".encode(encoding) _target_encoding = encoding except LookupError: pass def get_encoding_mode(): """ Get the mode Urwid is using when processing text strings. Returns 'narrow' for 8-bit encodings, 'wide' for CJK encodings or 'utf8' for UTF-8 encodings. """ return str_util.get_byte_encoding() def apply_target_encoding( s ): """ Return (encoded byte string, character set rle). """ if _use_dec_special and type(s) == text_type: # first convert drawing characters try: s = s.translate( escape.DEC_SPECIAL_CHARMAP ) except NotImplementedError: # python < 2.4 needs to do this the hard way.. for c, alt in zip(escape.DEC_SPECIAL_CHARS, escape.ALT_DEC_SPECIAL_CHARS): s = s.replace( c, escape.SO+alt+escape.SI ) if type(s) == text_type: s = s.replace(escape.SI+escape.SO, u"") # remove redundant shifts s = codecs.encode(s, _target_encoding, 'replace') assert isinstance(s, bytes) SO = escape.SO.encode('ascii') SI = escape.SI.encode('ascii') sis = s.split(SO) assert isinstance(sis[0], bytes) sis0 = sis[0].replace(SI, bytes()) sout = [] cout = [] if sis0: sout.append( sis0 ) cout.append( (None,len(sis0)) ) if len(sis)==1: return sis0, cout for sn in sis[1:]: assert isinstance(sn, bytes) assert isinstance(SI, bytes) sl = sn.split(SI, 1) if len(sl) == 1: sin = sl[0] assert isinstance(sin, bytes) sout.append(sin) rle_append_modify(cout, (escape.DEC_TAG.encode('ascii'), len(sin))) continue sin, son = sl son = son.replace(SI, bytes()) if sin: sout.append(sin) rle_append_modify(cout, (escape.DEC_TAG, len(sin))) if son: sout.append(son) rle_append_modify(cout, (None, len(son))) outstr = bytes().join(sout) return outstr, cout ###################################################################### # Try to set the encoding using the one detected by the locale module set_encoding( detected_encoding ) ###################################################################### def supports_unicode(): """ Return True if python is able to convert non-ascii unicode strings to the current encoding. """ return _target_encoding and _target_encoding != 'ascii' def calc_trim_text( text, start_offs, end_offs, start_col, end_col ): """ Calculate the result of trimming text. start_offs -- offset into text to treat as screen column 0 end_offs -- offset into text to treat as the end of the line start_col -- screen column to trim at the left end_col -- screen column to trim at the right Returns (start, end, pad_left, pad_right), where: start -- resulting start offset end -- resulting end offset pad_left -- 0 for no pad or 1 for one space to be added pad_right -- 0 for no pad or 1 for one space to be added """ spos = start_offs pad_left = pad_right = 0 if start_col > 0: spos, sc = calc_text_pos( text, spos, end_offs, start_col ) if sc < start_col: pad_left = 1 spos, sc = calc_text_pos( text, start_offs, end_offs, start_col+1 ) run = end_col - start_col - pad_left pos, sc = calc_text_pos( text, spos, end_offs, run ) if sc < run: pad_right = 1 return ( spos, pos, pad_left, pad_right ) def trim_text_attr_cs( text, attr, cs, start_col, end_col ): """ Return ( trimmed text, trimmed attr, trimmed cs ). """ spos, epos, pad_left, pad_right = calc_trim_text( text, 0, len(text), start_col, end_col ) attrtr = rle_subseg( attr, spos, epos ) cstr = rle_subseg( cs, spos, epos ) if pad_left: al = rle_get_at( attr, spos-1 ) rle_append_beginning_modify( attrtr, (al, 1) ) rle_append_beginning_modify( cstr, (None, 1) ) if pad_right: al = rle_get_at( attr, epos ) rle_append_modify( attrtr, (al, 1) ) rle_append_modify( cstr, (None, 1) ) return (bytes().rjust(pad_left) + text[spos:epos] + bytes().rjust(pad_right), attrtr, cstr) def rle_get_at( rle, pos ): """ Return the attribute at offset pos. """ x = 0 if pos < 0: return None for a, run in rle: if x+run > pos: return a x += run return None def rle_subseg( rle, start, end ): """Return a sub segment of an rle list.""" l = [] x = 0 for a, run in rle: if start: if start >= run: start -= run x += run continue x += start run -= start start = 0 if x >= end: break if x+run > end: run = end-x x += run l.append( (a, run) ) return l def rle_len( rle ): """ Return the number of characters covered by a run length encoded attribute list. """ run = 0 for v in rle: assert type(v) == tuple, repr(rle) a, r = v run += r return run def rle_append_beginning_modify(rle, a_r): """ Append (a, r) (unpacked from *a_r*) to BEGINNING of rle. Merge with first run when possible MODIFIES rle parameter contents. Returns None. """ a, r = a_r if not rle: rle[:] = [(a, r)] else: al, run = rle[0] if a == al: rle[0] = (a,run+r) else: rle[0:0] = [(al, r)] def rle_append_modify(rle, a_r): """ Append (a, r) (unpacked from *a_r*) to the rle list rle. Merge with last run when possible. MODIFIES rle parameter contents. Returns None. """ a, r = a_r if not rle or rle[-1][0] != a: rle.append( (a,r) ) return la,lr = rle[-1] rle[-1] = (a, lr+r) def rle_join_modify( rle, rle2 ): """ Append attribute list rle2 to rle. Merge last run of rle with first run of rle2 when possible. MODIFIES attr parameter contents. Returns None. """ if not rle2: return rle_append_modify(rle, rle2[0]) rle += rle2[1:] def rle_product( rle1, rle2 ): """ Merge the runs of rle1 and rle2 like this: eg. rle1 = [ ("a", 10), ("b", 5) ] rle2 = [ ("Q", 5), ("P", 10) ] rle_product: [ (("a","Q"), 5), (("a","P"), 5), (("b","P"), 5) ] rle1 and rle2 are assumed to cover the same total run. """ i1 = i2 = 1 # rle1, rle2 indexes if not rle1 or not rle2: return [] a1, r1 = rle1[0] a2, r2 = rle2[0] l = [] while r1 and r2: r = min(r1, r2) rle_append_modify( l, ((a1,a2),r) ) r1 -= r if r1 == 0 and i1< len(rle1): a1, r1 = rle1[i1] i1 += 1 r2 -= r if r2 == 0 and i2< len(rle2): a2, r2 = rle2[i2] i2 += 1 return l def rle_factor( rle ): """ Inverse of rle_product. """ rle1 = [] rle2 = [] for (a1, a2), r in rle: rle_append_modify( rle1, (a1, r) ) rle_append_modify( rle2, (a2, r) ) return rle1, rle2 class TagMarkupException(Exception): pass def decompose_tagmarkup(tm): """Return (text string, attribute list) for tagmarkup passed.""" tl, al = _tagmarkup_recurse(tm, None) # join as unicode or bytes based on type of first element text = tl[0][:0].join(tl) if al and al[-1][0] is None: del al[-1] return text, al def _tagmarkup_recurse( tm, attr ): """Return (text list, attribute list) for tagmarkup passed. tm -- tagmarkup attr -- current attribute or None""" if type(tm) == list: # for lists recurse to process each subelement rtl = [] ral = [] for element in tm: tl, al = _tagmarkup_recurse( element, attr ) if ral: # merge attributes when possible last_attr, last_run = ral[-1] top_attr, top_run = al[0] if last_attr == top_attr: ral[-1] = (top_attr, last_run + top_run) del al[-1] rtl += tl ral += al return rtl, ral if type(tm) == tuple: # tuples mark a new attribute boundary if len(tm) != 2: raise TagMarkupException("Tuples must be in the form (attribute, tagmarkup): %r" % (tm,)) attr, element = tm return _tagmarkup_recurse( element, attr ) if not isinstance(tm, text_types + (bytes,)): raise TagMarkupException("Invalid markup element: %r" % tm) # text return [tm], [(attr, len(tm))] def is_mouse_event( ev ): return type(ev) == tuple and len(ev)==4 and ev[0].find("mouse")>=0 def is_mouse_press( ev ): return ev.find("press")>=0 class MetaSuper(type): """adding .__super""" def __init__(cls, name, bases, d): super(MetaSuper, cls).__init__(name, bases, d) if hasattr(cls, "_%s__super" % name): raise AttributeError("Class has same name as one of its super classes") setattr(cls, "_%s__super" % name, super(cls)) def int_scale(val, val_range, out_range): """ Scale val in the range [0, val_range-1] to an integer in the range [0, out_range-1]. This implementation uses the "round-half-up" rounding method. >>> "%x" % int_scale(0x7, 0x10, 0x10000) '7777' >>> "%x" % int_scale(0x5f, 0x100, 0x10) '6' >>> int_scale(2, 6, 101) 40 >>> int_scale(1, 3, 4) 2 """ num = int(val * (out_range-1) * 2 + (val_range-1)) dem = ((val_range-1) * 2) # if num % dem == 0 then we are exactly half-way and have rounded up. return num // dem class StoppingContext(object): """Context manager that calls ``stop`` on a given object on exit. Used to make the ``start`` method on `MainLoop` and `BaseScreen` optionally act as context managers. """ def __init__(self, wrapped): self._wrapped = wrapped def __enter__(self): return self def __exit__(self, *exc_info): self._wrapped.stop()