diff options
Diffstat (limited to 'Demo/tkinter/www/fmt.py')
| -rwxr-xr-x | Demo/tkinter/www/fmt.py | 627 |
1 files changed, 627 insertions, 0 deletions
diff --git a/Demo/tkinter/www/fmt.py b/Demo/tkinter/www/fmt.py new file mode 100755 index 0000000..b5ca33c --- /dev/null +++ b/Demo/tkinter/www/fmt.py @@ -0,0 +1,627 @@ +# Text formatting abstractions + + +import string +import Para + + +# A formatter back-end object has one method that is called by the formatter: +# addpara(p), where p is a paragraph object. For example: + + +# Formatter back-end to do nothing at all with the paragraphs +class NullBackEnd: + # + def __init__(self): + pass + # + def addpara(self, p): + pass + # + def bgn_anchor(self, id): + pass + # + def end_anchor(self, id): + pass + + +# Formatter back-end to collect the paragraphs in a list +class SavingBackEnd(NullBackEnd): + # + def __init__(self): + self.paralist = [] + # + def addpara(self, p): + self.paralist.append(p) + # + def hitcheck(self, h, v): + hits = [] + for p in self.paralist: + if p.top <= v <= p.bottom: + for id in p.hitcheck(h, v): + if id not in hits: + hits.append(id) + return hits + # + def extract(self): + text = '' + for p in self.paralist: + text = text + (p.extract()) + return text + # + def extractpart(self, long1, long2): + if long1 > long2: long1, long2 = long2, long1 + para1, pos1 = long1 + para2, pos2 = long2 + text = '' + while para1 < para2: + ptext = self.paralist[para1].extract() + text = text + ptext[pos1:] + pos1 = 0 + para1 = para1 + 1 + ptext = self.paralist[para2].extract() + return text + ptext[pos1:pos2] + # + def whereis(self, d, h, v): + total = 0 + for i in range(len(self.paralist)): + p = self.paralist[i] + result = p.whereis(d, h, v) + if result <> None: + return i, result + return None + # + def roundtowords(self, long1, long2): + i, offset = long1 + text = self.paralist[i].extract() + while offset > 0 and text[offset-1] <> ' ': offset = offset-1 + long1 = i, offset + # + i, offset = long2 + text = self.paralist[i].extract() + n = len(text) + while offset < n-1 and text[offset] <> ' ': offset = offset+1 + long2 = i, offset + # + return long1, long2 + # + def roundtoparagraphs(self, long1, long2): + long1 = long1[0], 0 + long2 = long2[0], len(self.paralist[long2[0]].extract()) + return long1, long2 + + +# Formatter back-end to send the text directly to the drawing object +class WritingBackEnd(NullBackEnd): + # + def __init__(self, d, width): + self.d = d + self.width = width + self.lineno = 0 + # + def addpara(self, p): + self.lineno = p.render(self.d, 0, self.lineno, self.width) + + +# A formatter receives a stream of formatting instructions and assembles +# these into a stream of paragraphs on to a back-end. The assembly is +# parametrized by a text measurement object, which must match the output +# operations of the back-end. The back-end is responsible for splitting +# paragraphs up in lines of a given maximum width. (This is done because +# in a windowing environment, when the window size changes, there is no +# need to redo the assembly into paragraphs, but the splitting into lines +# must be done taking the new window size into account.) + + +# Formatter base class. Initialize it with a text measurement object, +# which is used for text measurements, and a back-end object, +# which receives the completed paragraphs. The formatting methods are: +# setfont(font) +# setleftindent(nspaces) +# setjust(type) where type is 'l', 'c', 'r', or 'lr' +# flush() +# vspace(nlines) +# needvspace(nlines) +# addword(word, nspaces) +class BaseFormatter: + # + def __init__(self, d, b): + # Drawing object used for text measurements + self.d = d + # + # BackEnd object receiving completed paragraphs + self.b = b + # + # Parameters of the formatting model + self.leftindent = 0 + self.just = 'l' + self.font = None + self.blanklines = 0 + # + # Parameters derived from the current font + self.space = d.textwidth(' ') + self.line = d.lineheight() + self.ascent = d.baseline() + self.descent = self.line - self.ascent + # + # Parameter derived from the default font + self.n_space = self.space + # + # Current paragraph being built + self.para = None + self.nospace = 1 + # + # Font to set on the next word + self.nextfont = None + # + def newpara(self): + return Para.Para() + # + def setfont(self, font): + if font == None: return + self.font = self.nextfont = font + d = self.d + d.setfont(font) + self.space = d.textwidth(' ') + self.line = d.lineheight() + self.ascent = d.baseline() + self.descent = self.line - self.ascent + # + def setleftindent(self, nspaces): + self.leftindent = int(self.n_space * nspaces) + if self.para: + hang = self.leftindent - self.para.indent_left + if hang > 0 and self.para.getlength() <= hang: + self.para.makehangingtag(hang) + self.nospace = 1 + else: + self.flush() + # + def setrightindent(self, nspaces): + self.rightindent = int(self.n_space * nspaces) + if self.para: + self.para.indent_right = self.rightindent + self.flush() + # + def setjust(self, just): + self.just = just + if self.para: + self.para.just = self.just + # + def flush(self): + if self.para: + self.b.addpara(self.para) + self.para = None + if self.font <> None: + self.d.setfont(self.font) + self.nospace = 1 + # + def vspace(self, nlines): + self.flush() + if nlines > 0: + self.para = self.newpara() + tuple = None, '', 0, 0, 0, int(nlines*self.line), 0 + self.para.words.append(tuple) + self.flush() + self.blanklines = self.blanklines + nlines + # + def needvspace(self, nlines): + self.flush() # Just to be sure + if nlines > self.blanklines: + self.vspace(nlines - self.blanklines) + # + def addword(self, text, space): + if self.nospace and not text: + return + self.nospace = 0 + self.blanklines = 0 + if not self.para: + self.para = self.newpara() + self.para.indent_left = self.leftindent + self.para.just = self.just + self.nextfont = self.font + space = int(space * self.space) + self.para.words.append(self.nextfont, text, \ + self.d.textwidth(text), space, space, \ + self.ascent, self.descent) + self.nextfont = None + # + def bgn_anchor(self, id): + if not self.para: + self.nospace = 0 + self.addword('', 0) + self.para.bgn_anchor(id) + # + def end_anchor(self, id): + if not self.para: + self.nospace = 0 + self.addword('', 0) + self.para.end_anchor(id) + # + def hrule(self): + # Typically need to override this for bit-mapped displays + self.flush() + self.addword('-'*60, 0) + self.flush() + + +# Measuring object for measuring text as viewed on a tty +class NullMeasurer: + # + def __init__(self): + pass + # + def setfont(self, font): + pass + # + def textwidth(self, text): + return len(text) + # + def lineheight(self): + return 1 + # + def baseline(self): + return 0 + + +# Drawing object for writing plain ASCII text to a file +class FileWriter: + # + def __init__(self, fp): + self.fp = fp + self.lineno, self.colno = 0, 0 + # + def setfont(self, font): + pass + # + def text(self, (h, v), str): + if not str: return + if '\n' in str: + raise ValueError, 'can\'t write \\n' + while self.lineno < v: + self.fp.write('\n') + self.colno, self.lineno = 0, self.lineno + 1 + while self.lineno > v: + # XXX This should never happen... + self.fp.write('\033[A') # ANSI up arrow + self.lineno = self.lineno - 1 + if self.colno < h: + self.fp.write(' ' * (h - self.colno)) + elif self.colno > h: + self.fp.write('\b' * (self.colno - h)) + self.colno = h + self.fp.write(str) + self.colno = h + len(str) + + +# Formatting class to do nothing at all with the data +class NullFormatter(BaseFormatter): + # + def __init__(self): + d = NullMeasurer() + b = NullBackEnd() + BaseFormatter.__init__(self, d, b) + + +# Formatting class to write directly to a file +class WritingFormatter(BaseFormatter): + # + def __init__(self, fp, width): + dm = NullMeasurer() + dw = FileWriter(fp) + b = WritingBackEnd(dw, width) + BaseFormatter.__init__(self, dm, b) + self.blanklines = 1 + # + # Suppress multiple blank lines + def needvspace(self, nlines): + BaseFormatter.needvspace(self, min(1, nlines)) + + +# A "FunnyFormatter" writes ASCII text with a twist: *bold words*, +# _italic text_ and _underlined words_, and `quoted text'. +# It assumes that the fonts are 'r', 'i', 'b', 'u', 'q': (roman, +# italic, bold, underline, quote). +# Moreover, if the font is in upper case, the text is converted to +# UPPER CASE. +class FunnyFormatter(WritingFormatter): + # + def flush(self): + if self.para: finalize(self.para) + WritingFormatter.flush(self) + + +# Surrounds *bold words* and _italic text_ in a paragraph with +# appropriate markers, fixing the size (assuming these characters' +# width is 1). +openchar = \ + {'b':'*', 'i':'_', 'u':'_', 'q':'`', 'B':'*', 'I':'_', 'U':'_', 'Q':'`'} +closechar = \ + {'b':'*', 'i':'_', 'u':'_', 'q':'\'', 'B':'*', 'I':'_', 'U':'_', 'Q':'\''} +def finalize(para): + oldfont = curfont = 'r' + para.words.append('r', '', 0, 0, 0, 0) # temporary, deleted at end + for i in range(len(para.words)): + fo, te, wi = para.words[i][:3] + if fo <> None: curfont = fo + if curfont <> oldfont: + if closechar.has_key(oldfont): + c = closechar[oldfont] + j = i-1 + while j > 0 and para.words[j][1] == '': j = j-1 + fo1, te1, wi1 = para.words[j][:3] + te1 = te1 + c + wi1 = wi1 + len(c) + para.words[j] = (fo1, te1, wi1) + \ + para.words[j][3:] + if openchar.has_key(curfont) and te: + c = openchar[curfont] + te = c + te + wi = len(c) + wi + para.words[i] = (fo, te, wi) + \ + para.words[i][3:] + if te: oldfont = curfont + else: oldfont = 'r' + if curfont in string.uppercase: + te = string.upper(te) + para.words[i] = (fo, te, wi) + para.words[i][3:] + del para.words[-1] + + +# Formatter back-end to draw the text in a window. +# This has an option to draw while the paragraphs are being added, +# to minimize the delay before the user sees anything. +# This manages the entire "document" of the window. +class StdwinBackEnd(SavingBackEnd): + # + def __init__(self, window, drawnow): + self.window = window + self.drawnow = drawnow + self.width = window.getwinsize()[0] + self.selection = None + self.height = 0 + window.setorigin(0, 0) + window.setdocsize(0, 0) + self.d = window.begindrawing() + SavingBackEnd.__init__(self) + # + def finish(self): + self.d.close() + self.d = None + self.window.setdocsize(0, self.height) + # + def addpara(self, p): + self.paralist.append(p) + if self.drawnow: + self.height = \ + p.render(self.d, 0, self.height, self.width) + else: + p.layout(self.width) + p.left = 0 + p.top = self.height + p.right = self.width + p.bottom = self.height + p.height + self.height = p.bottom + # + def resize(self): + self.window.change((0, 0), (self.width, self.height)) + self.width = self.window.getwinsize()[0] + self.height = 0 + for p in self.paralist: + p.layout(self.width) + p.left = 0 + p.top = self.height + p.right = self.width + p.bottom = self.height + p.height + self.height = p.bottom + self.window.change((0, 0), (self.width, self.height)) + self.window.setdocsize(0, self.height) + # + def redraw(self, area): + d = self.window.begindrawing() + (left, top), (right, bottom) = area + d.erase(area) + d.cliprect(area) + for p in self.paralist: + if top < p.bottom and p.top < bottom: + v = p.render(d, p.left, p.top, p.right) + if self.selection: + self.invert(d, self.selection) + d.close() + # + def setselection(self, new): + if new: + long1, long2 = new + pos1 = long1[:3] + pos2 = long2[:3] + new = pos1, pos2 + if new <> self.selection: + d = self.window.begindrawing() + if self.selection: + self.invert(d, self.selection) + if new: + self.invert(d, new) + d.close() + self.selection = new + # + def getselection(self): + return self.selection + # + def extractselection(self): + if self.selection: + a, b = self.selection + return self.extractpart(a, b) + else: + return None + # + def invert(self, d, region): + long1, long2 = region + if long1 > long2: long1, long2 = long2, long1 + para1, pos1 = long1 + para2, pos2 = long2 + while para1 < para2: + self.paralist[para1].invert(d, pos1, None) + pos1 = None + para1 = para1 + 1 + self.paralist[para2].invert(d, pos1, pos2) + # + def search(self, prog): + import regex, string + if type(prog) == type(''): + prog = regex.compile(string.lower(prog)) + if self.selection: + iold = self.selection[0][0] + else: + iold = -1 + hit = None + for i in range(len(self.paralist)): + if i == iold or i < iold and hit: + continue + p = self.paralist[i] + text = string.lower(p.extract()) + if prog.search(text) >= 0: + a, b = prog.regs[0] + long1 = i, a + long2 = i, b + hit = long1, long2 + if i > iold: + break + if hit: + self.setselection(hit) + i = hit[0][0] + p = self.paralist[i] + self.window.show((p.left, p.top), (p.right, p.bottom)) + return 1 + else: + return 0 + # + def showanchor(self, id): + for i in range(len(self.paralist)): + p = self.paralist[i] + if p.hasanchor(id): + long1 = i, 0 + long2 = i, len(p.extract()) + hit = long1, long2 + self.setselection(hit) + self.window.show( \ + (p.left, p.top), (p.right, p.bottom)) + break + + +# GL extensions + +class GLFontCache: + # + def __init__(self): + self.reset() + self.setfont('') + # + def reset(self): + self.fontkey = None + self.fonthandle = None + self.fontinfo = None + self.fontcache = {} + # + def close(self): + self.reset() + # + def setfont(self, fontkey): + if fontkey == '': + fontkey = 'Times-Roman 12' + elif ' ' not in fontkey: + fontkey = fontkey + ' 12' + if fontkey == self.fontkey: + return + if self.fontcache.has_key(fontkey): + handle = self.fontcache[fontkey] + else: + import string + i = string.index(fontkey, ' ') + name, sizestr = fontkey[:i], fontkey[i:] + size = eval(sizestr) + key1 = name + ' 1' + key = name + ' ' + `size` + # NB key may differ from fontkey! + if self.fontcache.has_key(key): + handle = self.fontcache[key] + else: + if self.fontcache.has_key(key1): + handle = self.fontcache[key1] + else: + import fm + handle = fm.findfont(name) + self.fontcache[key1] = handle + handle = handle.scalefont(size) + self.fontcache[fontkey] = \ + self.fontcache[key] = handle + self.fontkey = fontkey + if self.fonthandle <> handle: + self.fonthandle = handle + self.fontinfo = handle.getfontinfo() + handle.setfont() + + +class GLMeasurer(GLFontCache): + # + def textwidth(self, text): + return self.fonthandle.getstrwidth(text) + # + def baseline(self): + return self.fontinfo[6] - self.fontinfo[3] + # + def lineheight(self): + return self.fontinfo[6] + + +class GLWriter(GLFontCache): + # + # NOTES: + # (1) Use gl.ortho2 to use X pixel coordinates! + # + def text(self, (h, v), text): + import gl, fm + gl.cmov2i(h, v + self.fontinfo[6] - self.fontinfo[3]) + fm.prstr(text) + # + def setfont(self, fontkey): + oldhandle = self.fonthandle + GLFontCache.setfont(fontkey) + if self.fonthandle <> oldhandle: + handle.setfont() + + +class GLMeasurerWriter(GLMeasurer, GLWriter): + pass + + +class GLBackEnd(SavingBackEnd): + # + def __init__(self, wid): + import gl + gl.winset(wid) + self.wid = wid + self.width = gl.getsize()[1] + self.height = 0 + self.d = GLMeasurerWriter() + SavingBackEnd.__init__(self) + # + def finish(self): + pass + # + def addpara(self, p): + self.paralist.append(p) + self.height = p.render(self.d, 0, self.height, self.width) + # + def redraw(self): + import gl + gl.winset(self.wid) + width = gl.getsize()[1] + if width <> self.width: + setdocsize = 1 + self.width = width + for p in self.paralist: + p.top = p.bottom = None + d = self.d + v = 0 + for p in self.paralist: + v = p.render(d, 0, v, width) |