def __init__(self, text=None, attr=None, cs=None,
cursor=None, maxcol=None, check_width=True):
"""
text -- list of strings, one for each line
attr -- list of run length encoded attributes for text
cs -- list of run length encoded character set for text
cursor -- (x,y) of cursor or None
maxcol -- screen columns taken by this canvas
check_width -- check and fix width of all lines in text
"""
Canvas.__init__(self)
if text == None:
text = []
if check_width:
widths = []
for t in text:
if type(t) != type(""):
raise CanvasError("Canvas text must be plain strings encoded in the screen's encoding", `text`)
widths.append( calc_width( t, 0, len(t)) )
else:
assert type(maxcol) == type(0)
widths = [maxcol] * len(text)
if maxcol is None:
if widths:
# find maxcol ourselves
maxcol = max(widths)
else:
maxcol = 0
if attr == None:
attr = [[] for x in range(len(text))]
if cs == None:
cs = [[] for x in range(len(text))]
# pad text and attr to maxcol
for i in range(len(text)):
w = widths[i]
if w > maxcol:
raise CanvasError("Canvas text is wider than the maxcol specified \n%s\n%s\n%s"%(`maxcol`,`widths`,`text`))
if w < maxcol:
text[i] = text[i] + " "*(maxcol-w)
a_gap = len(text[i]) - rle_len( attr[i] )
if a_gap < 0:
raise CanvasError("Attribute extends beyond text \n%s\n%s" % (`text[i]`,`attr[i]`) )
if a_gap:
rle_append_modify( attr[i], (None, a_gap))
cs_gap = len(text[i]) - rle_len( cs[i] )
if cs_gap < 0:
raise CanvasError("Character Set extends beyond text \n%s\n%s" % (`text[i]`,`cs[i]`) )
if cs_gap:
rle_append_modify( cs[i], (None, cs_gap))
self._attr = attr
self._cs = cs
self.cursor = cursor
self._text = text
self._maxcol = maxcol
def attrrange( start_offs, end_offs, destw ):
"""
Add attributes based on attributes between
start_offs and end_offs.
"""
if start_offs == end_offs:
[(at,run)] = arange(start_offs,end_offs)
rle_append_modify( linea, ( at, destw ))
return
if destw == end_offs-start_offs:
for at, run in arange(start_offs,end_offs):
rle_append_modify( linea, ( at, run ))
return
# encoded version has different width
o = start_offs
for at, run in arange(start_offs, end_offs):
if o+run == end_offs:
rle_append_modify( linea, ( at, destw ))
return
tseg = text[o:o+run]
tseg, cs = apply_target_encoding( tseg )
segw = rle_len(cs)
rle_append_modify( linea, ( at, segw ))
o += run
destw -= segw
def apply_text_layout(text, attr, ls, maxcol):
t = []
a = []
c = []
class AttrWalk:
pass
aw = AttrWalk
aw.k = 0 # counter for moving through elements of a
aw.off = 0 # current offset into text of attr[ak]
def arange( start_offs, end_offs ):
"""Return an attribute list for the range of text specified."""
if start_offs < aw.off:
aw.k = 0
aw.off = 0
o = []
while aw.off < end_offs:
if len(attr)<=aw.k:
# run out of attributes
o.append((None,end_offs-max(start_offs,aw.off)))
break
at,run = attr[aw.k]
if aw.off+run <= start_offs:
# move forward through attr to find start_offs
aw.k += 1
aw.off += run
continue
if end_offs <= aw.off+run:
o.append((at, end_offs-max(start_offs,aw.off)))
break
o.append((at, aw.off+run-max(start_offs, aw.off)))
aw.k += 1
aw.off += run
return o
for line_layout in ls:
# trim the line to fit within maxcol
line_layout = trim_line( line_layout, text, 0, maxcol )
line = []
linea = []
linec = []
def attrrange( start_offs, end_offs, destw ):
"""
Add attributes based on attributes between
start_offs and end_offs.
"""
if start_offs == end_offs:
[(at,run)] = arange(start_offs,end_offs)
rle_append_modify( linea, ( at, destw ))
return
if destw == end_offs-start_offs:
for at, run in arange(start_offs,end_offs):
rle_append_modify( linea, ( at, run ))
return
# encoded version has different width
o = start_offs
for at, run in arange(start_offs, end_offs):
if o+run == end_offs:
rle_append_modify( linea, ( at, destw ))
return
tseg = text[o:o+run]
tseg, cs = apply_target_encoding( tseg )
segw = rle_len(cs)
rle_append_modify( linea, ( at, segw ))
o += run
destw -= segw
for seg in line_layout:
#if seg is None: assert 0, ls
s = LayoutSegment(seg)
if s.end:
tseg, cs = apply_target_encoding(
text[s.offs:s.end])
line.append(tseg)
attrrange(s.offs, s.end, rle_len(cs))
rle_join_modify( linec, cs )
elif s.text:
tseg, cs = apply_target_encoding( s.text )
line.append(tseg)
attrrange( s.offs, s.offs, len(tseg) )
rle_join_modify( linec, cs )
elif s.offs:
if s.sc:
line.append(" "*s.sc)
attrrange( s.offs, s.offs, s.sc )
else:
line.append(" "*s.sc)
linea.append((None, s.sc))
linec.append((None, s.sc))
t.append("".join(line))
a.append(linea)
c.append(linec)
return TextCanvas(t, a, c, maxcol=maxcol)
