#Copyright ReportLab Europe Ltd. 2000-2004
#see license.txt for license details
#history http://www.reportlab.co.uk/cgi-bin/viewcvs.cgi/public/reportlab/trunk/reportlab/platypus/tables.py
__version__=''' $Id$ '''

__doc__="""
Tables are created by passing the constructor a tuple of column widths, a tuple of row heights and the data in
row order. Drawing of the table can be controlled by using a TableStyle instance. This allows control of the
color and weight of the lines (if any), and the font, alignment and padding of the text.

None values in the sequence of row heights or column widths, mean that the corresponding rows
or columns should be automatically sized.

All the cell values should be convertible to strings; embedded newline '\\n' characters
cause the value to wrap (ie are like a traditional linefeed).

See the test output from running this module as a script for a discussion of the method for constructing
tables and table styles.
"""
from reportlab.platypus.flowables import Flowable, Preformatted, Spacer
from reportlab import rl_config
from reportlab.lib.styles import PropertySet, ParagraphStyle, _baseFontName
from reportlab.lib import colors
from reportlab.lib.utils import fp_str, annotateException, IdentStr, flatten
from reportlab.lib.abag import ABag as CellFrame
from reportlab.pdfbase.pdfmetrics import stringWidth
from reportlab.platypus.doctemplate import Indenter
from reportlab.platypus.flowables import LIIndenter

LINECAPS={None: None, 'butt':0,'round':1,'projecting':2,'squared':2}
LINEJOINS={None: None, 'miter':0, 'mitre':0, 'round':1,'bevel':2}

class CellStyle(PropertySet):
    fontname = _baseFontName
    fontsize = 10
    leading = 12
    leftPadding = 6
    rightPadding = 6
    topPadding = 3
    bottomPadding = 3
    firstLineIndent = 0
    color = 'black'
    alignment = 'LEFT'
    background = 'white'
    valign = "BOTTOM"
    href = None
    destination = None
    def __init__(self, name, parent=None):
        self.name = name
        if parent is not None:
            parent.copy(self)
    def copy(self, result=None):
        if result is None:
            result = CellStyle()
        for name in dir(self):
            setattr(result, name, getattr(self, name))
        return result

class TableStyle:
    def __init__(self, cmds=None, parent=None, **kw):
        #handle inheritance from parent first.
        commands = []
        if parent:
            # copy the parents list at construction time
            commands = commands + parent.getCommands()
            self._opts = parent._opts
            for a in ('spaceBefore','spaceAfter'):
                if hasattr(parent,a):
                    setattr(self,a,getattr(parent,a))
        if cmds:
            commands = commands + list(cmds)
        self._cmds = commands
        self._opts={}
        self._opts.update(kw)

    def add(self, *cmd):
        self._cmds.append(cmd)
    def __repr__(self):
        return "TableStyle(\n%s\n) # end TableStyle" % "  \n".join(map(repr, self._cmds))
    def getCommands(self):
        return self._cmds

def _rowLen(x):
    return not isinstance(x,(tuple,list)) and 1 or len(x)

def _calc_pc(V,avail):
    '''check list V for percentage or * values
    1) absolute values go through unchanged
    2) percentages are used as weights for unconsumed space
    3) if no None values were seen '*' weights are
    set equally with unclaimed space
    otherwise * weights are assigned as None'''
    R = []
    r = R.append
    I = []
    i = I.append
    J = []
    j = J.append
    s = avail
    w = n = 0.
    for v in V:
        if isinstance(v,basestring):
            v = v.strip()
            if not v:
                v = None
                n += 1
            elif v.endswith('%'):
                v = float(v[:-1])
                w += v
                i(len(R))
            elif v=='*':
                j(len(R))
            else:
                v = float(v)
                s -= v
        elif v is None:
            n += 1
        else:
            s -= v
        r(v)
    s = max(0.,s)
    f = s/max(100.,w)
    for i in I:
        R[i] *= f
        s -= R[i]
    s = max(0.,s)
    m = len(J)
    if m:
        v =  n==0 and s/m or None
        for j in J:
            R[j] = v
    return R

def _hLine(canvLine, scp, ecp, y, hBlocks, FUZZ=rl_config._FUZZ):
    '''
    Draw horizontal lines; do not draw through regions specified in hBlocks
    This also serves for vertical lines with a suitable canvLine
    '''
    if hBlocks: hBlocks = hBlocks.get(y,None)
    if not hBlocks or scp>=hBlocks[-1][1]-FUZZ or ecp<=hBlocks[0][0]+FUZZ:
        canvLine(scp,y,ecp,y)
    else:
        i = 0
        n = len(hBlocks)
        while scp<ecp-FUZZ and i<n:
            x0, x1 = hBlocks[i]
            if x1<=scp+FUZZ or x0>=ecp-FUZZ:
                i += 1
                continue
            i0 = max(scp,x0)
            i1 = min(ecp,x1)
            if i0>scp: canvLine(scp,y,i0,y)
            scp = i1
        if scp<ecp-FUZZ: canvLine(scp,y,ecp,y)

def _multiLine(scp,ecp,y,canvLine,ws,count):
    offset = 0.5*(count-1)*ws
    y += offset
    for idx in xrange(count):
        canvLine(scp, y, ecp, y)
        y -= ws

def _convert2int(value, map, low, high, name, cmd):
    '''private converter tries map(value) low<=int(value)<=high or finally an error'''
    try:
        return map[value]
    except KeyError:
        try:
            ivalue = int(value)
            if low<=ivalue<=high: return ivalue
        except:
            pass
    raise ValueError('Bad %s value %s in %s'%(name,value,str(cmd)))

def _endswith(obj,s):
    try:
        return obj.endswith(s)
    except:
        return 0

def spanFixDim(V0,V,spanCons,lim=None,FUZZ=rl_config._FUZZ):
    #assign required space to variable rows equally to existing calculated values
    M = {}
    if not lim: lim = len(V0)   #in longtables the row calcs may be truncated
    for (x0,x1),v in spanCons.iteritems():
        if x0>=lim: continue
        x1 += 1
        t = sum([(V[x] or 0)+M.get(x,0) for x in xrange(x0,x1)])
        if t>=v-FUZZ: continue      #already good enough
        X = [x for x in xrange(x0,x1) if V0[x] is None] #variable candidates
        if not X: continue          #something wrong here mate
        v -= t
        v /= float(len(X))
        for x in X:
            M[x] = M.get(x,0)+v
    for x,v in M.iteritems():
        V[x] += v

class _ExpandedCellTuple(tuple):
    pass

class Table(Flowable):
    def __init__(self, data, colWidths=None, rowHeights=None, style=None,
                repeatRows=0, repeatCols=0, splitByRow=1, emptyTableAction=None, ident=None,
                hAlign=None,vAlign=None, normalizedData=0, cellStyles=None):
        self.ident = ident
        self.hAlign = hAlign or 'CENTER'
        self.vAlign = vAlign or 'MIDDLE'
        if not isinstance(data,(tuple,list)):
            raise ValueError("%s invalid data type" % self.identity())
        self._nrows = nrows = len(data)
        self._cellvalues = []
        _seqCW = isinstance(colWidths,(tuple,list))
        _seqRH = isinstance(rowHeights,(tuple,list))
        if nrows: self._ncols = ncols = max(map(_rowLen,data))
        elif colWidths and _seqCW: ncols = len(colWidths)
        else: ncols = 0
        if not emptyTableAction: emptyTableAction = rl_config.emptyTableAction
        self._longTableOptimize = getattr(self,'_longTableOptimize',rl_config.longTableOptimize)
        if not (nrows and ncols):
            if emptyTableAction=='error':
                raise ValueError("%s must have at least a row and column" % self.identity())
            elif emptyTableAction=='indicate':
                self.__class__ = Preformatted
                global _emptyTableStyle
                if '_emptyTableStyle' not in globals().keys():
                    _emptyTableStyle = ParagraphStyle('_emptyTableStyle')
                    _emptyTableStyle.textColor = colors.red
                    _emptyTableStyle.backColor = colors.yellow
                Preformatted.__init__(self,'%s(%d,%d)' % (self.__class__.__name__,nrows,ncols), _emptyTableStyle)
            elif emptyTableAction=='ignore':
                self.__class__ = Spacer
                Spacer.__init__(self,0,0)
            else:
                raise ValueError('%s bad emptyTableAction: "%s"' % (self.identity(),emptyTableAction))
            return

        # we need a cleanup pass to ensure data is strings - non-unicode and non-null
        if normalizedData:
            self._cellvalues = data
        else:
            self._cellvalues = data = self.normalizeData(data)
        if not _seqCW: colWidths = ncols*[colWidths]
        elif len(colWidths)!=ncols:
            if rl_config.allowShortTableRows and isinstance(colWidths,list):
                n = len(colWidths)
                if n<ncols:
                    colWidths[n:] = (ncols-n)*[colWidths[-1]]
                else:
                    colWidths = colWidths[:ncols]
            else:
                raise ValueError("%s data error - %d columns in data but %d in column widths" % (self.identity(),ncols, len(colWidths)))
        if not _seqRH: rowHeights = nrows*[rowHeights]
        elif len(rowHeights) != nrows:
            raise ValueError("%s data error - %d rows in data but %d in row heights" % (self.identity(),nrows, len(rowHeights)))
        for i,d in enumerate(data):
            n = len(d)
            if n!=ncols:
                if rl_config.allowShortTableRows and isinstance(d,list):
                    d[n:] = (ncols-n)*['']
                else:
                    raise ValueError("%s expected %d not %d columns in row %d!" % (self.identity(),ncols,n,i))
        self._rowHeights = self._argH = rowHeights
        self._colWidths = self._argW = colWidths
        if cellStyles is None:
            cellrows = []
            for i in xrange(nrows):
                cellcols = []
                for j in xrange(ncols):
                    cellcols.append(CellStyle(repr((i,j))))
                cellrows.append(cellcols)
            self._cellStyles = cellrows
        else:
            self._cellStyles = cellStyles

        self._bkgrndcmds = []
        self._linecmds = []
        self._spanCmds = []
        self._nosplitCmds = []
        self.repeatRows = repeatRows
        self.repeatCols = repeatCols
        self.splitByRow = splitByRow

        if style:
            self.setStyle(style)

    def __repr__(self):
        "incomplete, but better than nothing"
        r = getattr(self,'_rowHeights','[unknown]')
        c = getattr(self,'_colWidths','[unknown]')
        cv = getattr(self,'_cellvalues','[unknown]')
        import pprint
        cv = pprint.pformat(cv)
        cv = cv.replace("\n", "\n  ")
        return "%s(\n rowHeights=%s,\n colWidths=%s,\n%s\n) # end table" % (self.__class__.__name__,r,c,cv)

    def normalizeData(self, data):
        """Takes a block of input data (list of lists etc.) and
        - coerces unicode strings to non-unicode UTF8
        - coerces nulls to ''
        -

        """
        def normCell(stuff):
            if stuff is None:
                return ''
            elif isinstance(stuff,unicode):
                return stuff.encode('utf8')
            else:
                return stuff
        outData = []
        for row in data:
            outRow = [normCell(cell) for cell in row]
            outData.append(outRow)
        from pprint import pprint as pp
        #pp(outData)
        return outData

    def identity(self, maxLen=30):
        '''Identify our selves as well as possible'''
        if self.ident: return self.ident
        vx = None
        nr = getattr(self,'_nrows','unknown')
        nc = getattr(self,'_ncols','unknown')
        cv = getattr(self,'_cellvalues',None)
        rh = getattr(self, '_rowHeights', None)
        if cv and 'unknown' not in (nr,nc):
            b = 0
            for i in xrange(nr):
                for j in xrange(nc):
                    v = cv[i][j]
                    if isinstance(v,(list,tuple,Flowable)):
                        if not isinstance(v,(tuple,list)): v = (v,)
                        r = ''
                        for vij in v:
                            r = vij.identity(maxLen)
                            if r and r[-4:]!='>...':
                                break
                        if r and r[-4:]!='>...':
                            ix, jx, vx, b = i, j, r, 1
                    else:
                        v = v is None and '' or str(v)
                        ix, jx, vx = i, j, v
                        b = (vx and isinstance(v,basestring)) and 1 or 0
                        if maxLen: vx = vx[:maxLen]
                    if b: break
                if b: break
        if rh:  #find tallest row, it's of great interest'
            tallest = '(tallest row %d)' % int(max(rh))
        else:
            tallest = ''
        if vx:
            vx = ' with cell(%d,%d) containing\n%s' % (ix,jx,repr(vx))
        else:
            vx = '...'

        return "<%s@0x%8.8X %s rows x %s cols%s>%s" % (self.__class__.__name__, id(self), nr, nc, tallest, vx)

    def _cellListIter(self,C,aW,aH):
        canv = getattr(self,'canv',None)
        for c in C:
            if getattr(c,'__split_only__',None):
                for d in c.splitOn(canv,aW,aH):
                    yield d
            else:
                yield c

    def _cellListProcess(self,C,aW,aH):
        if not isinstance(C,_ExpandedCellTuple):
            frame = None
            R = [].append
            for c in self._cellListIter(C,aW,aH):
                if isinstance(c,Indenter):
                    if not frame:
                        frame = CellFrame(_leftExtraIndent=0,_rightExtraIndent=0)
                    c.frameAction(frame)
                    if frame._leftExtraIndent<1e-8 and frame._rightExtraIndent<1e-8:
                        frame = None
                    continue
                if frame:
                    R(LIIndenter(c,leftIndent=frame._leftExtraIndent,rightIndent=frame._rightExtraIndent))
                else:
                    R(c)
            C = _ExpandedCellTuple(R.__self__)
        return C

    def _listCellGeom(self, V,w,s,W=None,H=None,aH=72000):
        if not V: return 0,0
        aW = w - s.leftPadding - s.rightPadding
        aH = aH - s.topPadding - s.bottomPadding
        t = 0
        w = 0
        canv = getattr(self,'canv',None)
        sb0 = None
        for v in V:
            vw, vh = v.wrapOn(canv, aW, aH)
            sb = v.getSpaceBefore()
            sa = v.getSpaceAfter()
            if W is not None: W.append(vw)
            if H is not None: H.append(vh)
            w = max(w,vw)
            t += vh + sa + sb
            if sb0 is None:
                sb0 = sb
        return w, t - sb0 - sa

    def _listValueWidth(self,V,aH=72000,aW=72000):
        if not V: return 0,0
        t = 0
        w = 0
        canv = getattr(self,'canv',None)
        return max([v.wrapOn(canv,aW,aH)[0] for v in V])

    def _calc_width(self,availWidth,W=None):
        if getattr(self,'_width_calculated_once',None): return
        #comments added by Andy to Robin's slightly terse variable names
        if not W: W = _calc_pc(self._argW,availWidth)   #widths array
        if None in W:  #some column widths are not given
            canv = getattr(self,'canv',None)
            saved = None
            if self._spanCmds:
                colSpanCells = self._colSpanCells
                spanRanges = self._spanRanges
            else:
                colSpanCells = ()
                spanRanges = {}
            spanCons = {}
            if W is self._argW:
                W0 = W
                W = W[:]
            else:
                W0 = W[:]
            V = self._cellvalues
            S = self._cellStyles
            while None in W:
                j = W.index(None) #find first unspecified column
                w = 0
                for i,Vi in enumerate(V):
                    v = Vi[j]
                    s = S[i][j]
                    ji = j,i
                    span = spanRanges.get(ji,None)
                    if ji in colSpanCells and not span: #if the current cell is part of a spanned region,
                        t = 0.0                         #assume a zero size.
                    else:#work out size
                        t = self._elementWidth(v,s)
                        if t is None:
                            raise ValueError("Flowable %s in cell(%d,%d) can't have auto width\n%s" % (v.identity(30),i,j,self.identity(30)))
                        t += s.leftPadding+s.rightPadding
                        if span:
                            c0 = span[0]
                            c1 = span[2]
                            if c0!=c1:
                                x = c0,c1
                                spanCons[x] = max(spanCons.get(x,t),t)
                                t = 0
                    if t>w: w = t   #record a new maximum

                W[j] = w

            if spanCons:
                try:
                    spanFixDim(W0,W,spanCons)
                except:
                    annotateException('\nspanning problem in %s\nW0=%r W=%r\nspanCons=%r' % (self.identity(),W0,W,spanCons))

        self._colWidths = W
        width = 0
        self._colpositions = [0]        #index -1 is right side boundary; we skip when processing cells
        for w in W:
            width = width + w
            self._colpositions.append(width)

        self._width = width
        self._width_calculated_once = 1

    def _elementWidth(self,v,s):
        if isinstance(v,(list,tuple)):
            w = 0
            for e in v:
                ew = self._elementWidth(e,s)
                if ew is None: return None
                w = max(w,ew)
            return w
        elif isinstance(v,Flowable) and v._fixedWidth:
            if hasattr(v, 'width') and isinstance(v.width,(int,float)): return v.width
            if hasattr(v, 'drawWidth') and isinstance(v.drawWidth,(int,float)): return v.drawWidth
        # Even if something is fixedWidth, the attribute to check is not
        # necessarily consistent (cf. Image.drawWidth).  Therefore, we'll
        # be extra-careful and fall through to this code if necessary.
        if hasattr(v, 'minWidth'):
            try:
                w = v.minWidth() # should be all flowables
                if isinstance(w,(float,int)): return w
            except AttributeError:
                pass
        if v is None: 
            return 0
        else:
            try:
                v = str(v).split("\n")
            except:
                return 0
        fontName = s.fontname
        fontSize = s.fontsize
        return max([stringWidth(x,fontName,fontSize) for x in v])

    def _calc_height(self, availHeight, availWidth, H=None, W=None):
        H = self._argH
        if not W: W = _calc_pc(self._argW,availWidth)   #widths array

        hmax = lim = len(H)
        longTable = self._longTableOptimize

        if None in H:
            canv = getattr(self,'canv',None)
            saved = None
            #get a handy list of any cells which span rows. should be ignored for sizing
            if self._spanCmds:
                rowSpanCells = self._rowSpanCells
                colSpanCells = self._colSpanCells
                spanRanges = self._spanRanges
                colpositions = self._colpositions
            else:
                rowSpanCells = colSpanCells = ()
                spanRanges = {}
            if canv: saved = canv._fontname, canv._fontsize, canv._leading
            H0 = H
            H = H[:]    #make a copy as we'll change it
            self._rowHeights = H
            spanCons = {}
            FUZZ = rl_config._FUZZ
            while None in H:
                i = H.index(None)
                V = self._cellvalues[i] # values for row i
                S = self._cellStyles[i] # styles for row i
                h = 0
                j = 0
                for j,(v, s, w) in enumerate(zip(V, S, W)): # value, style, width (lengths must match)
                    ji = j,i
                    span = spanRanges.get(ji,None)
                    if ji in rowSpanCells and not span:
                        continue # don't count it, it's either occluded or unreliable
                    else:
                        if isinstance(v,(tuple,list,Flowable)):
                            if isinstance(v,Flowable): v = (v,)
                            else: v = flatten(v)
                            v = V[j] = self._cellListProcess(v,w,None)
                            if w is None and not self._canGetWidth(v):
                                raise ValueError("Flowable %s in cell(%d,%d) can't have auto width in\n%s" % (v[0].identity(30),i,j,self.identity(30)))
                            if canv: canv._fontname, canv._fontsize, canv._leading = s.fontname, s.fontsize, s.leading or 1.2*s.fontsize
                            if ji in colSpanCells:
                                if not span: continue
                                w = max(colpositions[span[2]+1]-colpositions[span[0]],w)
                            dW,t = self._listCellGeom(v,w or self._listValueWidth(v),s)
                            if canv: canv._fontname, canv._fontsize, canv._leading = saved
                            dW = dW + s.leftPadding + s.rightPadding
                            if not rl_config.allowTableBoundsErrors and dW>w:
                                from reportlab.platypus.doctemplate import LayoutError
                                raise LayoutError("Flowable %s (%sx%s points) too wide for cell(%d,%d) (%sx* points) in\n%s" % (v[0].identity(30),fp_str(dW),fp_str(t),i,j, fp_str(w), self.identity(30)))
                        else:
                            v = (v is not None and str(v) or '').split("\n")
                            t = (s.leading or 1.2*s.fontSize)*len(v)
                        t += s.bottomPadding+s.topPadding
                        if span:
                            r0 = span[1]
                            r1 = span[3]
                            if r0!=r1:
                                x = r0,r1
                                spanCons[x] = max(spanCons.get(x,t),t)
                                t = 0
                    if t>h: h = t   #record a new maximum
                H[i] = h
                # we can stop if we have filled up all available room
                if longTable:
                    hmax = i
                    height = sum(H[:i])
                    if height > availHeight:
                        #we can terminate if all spans are complete in H[:i]
                        if spanCons:
                            msr = max([x[1] for x in spanCons.keys()])  #RS=[endrowspan,.....]
                            if hmax>=msr:
                                break
            if None not in H: hmax = lim

            if spanCons:
                try:
                    spanFixDim(H0,H,spanCons,lim=hmax)
                except:
                    annotateException('\nspanning problem in %s hmax=%s lim=%s avail=%s x %s\nH0=%r H=%r\nspanCons=%r' % (self.identity(),hmax,lim,availWidth,availHeight,H0,H,spanCons))

        height = self._height = sum(H[:hmax])
        self._rowpositions = [height]    # index 0 is actually topline; we skip when processing cells
        for h in H[:hmax]:
            height -= h
            self._rowpositions.append(height)
        assert abs(height)<1e-8, '!!!!!%s\ninternal height error height=%r hmax=%d Sum(H[:%d])=%r\nH=%r\nrowPositions=%r' % (self.identity(),height,hmax,hmax,self._height,H[:hmax],self._rowpositions)
        self._hmax = hmax

    def _calc(self, availWidth, availHeight):
        #if hasattr(self,'_width'): return

        #in some cases there are unsizable things in
        #cells.  If so, apply a different algorithm
        #and assign some withs in a less (thanks to Gary Poster) dumb way.
        #this CHANGES the widths array.
        if (None in self._colWidths or '*' in self._colWidths) and self._hasVariWidthElements():
            W = self._calcPreliminaryWidths(availWidth) #widths
        else:
            W = None

        # need to know which cells are part of spanned
        # ranges, so _calc_height and _calc_width can ignore them
        # in sizing
        if self._spanCmds:
            self._calcSpanRanges()
            if None in self._argH:
                self._calc_width(availWidth,W=W)

        if self._nosplitCmds:
            self._calcNoSplitRanges()

        # calculate the full table height
        self._calc_height(availHeight,availWidth,W=W)

        # calculate the full table width
        self._calc_width(availWidth,W=W)

        if self._spanCmds:
            #now work out the actual rect for each spanned cell from the underlying grid
            self._calcSpanRects()

    def _culprit(self):
        """Return a string describing the tallest element.
        
        Usually this is what causes tables to fail to split.  Currently
        tables are the only items to have a '_culprit' method. Doctemplate
        checks for it.
        """
        rh = self._rowHeights
        tallest = max(rh)
        rowNum = rh.index(tallest)
        #rowNum of limited interest as usually it's a split one
        #and we see row #1.  Text might be a nice addition.
        
        return 'tallest cell %0.1f points' % tallest
        
        

    def _hasVariWidthElements(self, upToRow=None):
        """Check for flowables in table cells and warn up front.

        Allow a couple which we know are fixed size such as
        images and graphics."""
        if upToRow is None: upToRow = self._nrows
        for row in xrange(min(self._nrows, upToRow)):
            for col in xrange(self._ncols):
                value = self._cellvalues[row][col]
                if not self._canGetWidth(value):
                    return 1
        return 0

    def _canGetWidth(self, thing):
        "Can we work out the width quickly?"
        if isinstance(thing,(list, tuple)):
            for elem in thing:
                if not self._canGetWidth(elem):
                    return 0
            return 1
        elif isinstance(thing, Flowable):
            return thing._fixedWidth  # must loosen this up
        else: #str, number, None etc.
            #anything else gets passed to str(...)
            # so should be sizable
            return 1

    def _calcPreliminaryWidths(self, availWidth):
        """Fallback algorithm for when main one fails.

        Where exact width info not given but things like
        paragraphs might be present, do a preliminary scan
        and assign some best-guess values."""

        W = list(self._argW) # _calc_pc(self._argW,availWidth)
        verbose = 0
        totalDefined = 0.0
        percentDefined = 0
        percentTotal = 0
        numberUndefined = 0
        numberGreedyUndefined = 0
        for w in W:
            if w is None:
                numberUndefined += 1
            elif w == '*':
                numberUndefined += 1
                numberGreedyUndefined += 1
            elif _endswith(w,'%'):
                percentDefined += 1
                percentTotal += float(w[:-1])
            else:
                assert isinstance(w,(int,float))
                totalDefined = totalDefined + w
        if verbose: print 'prelim width calculation.  %d columns, %d undefined width, %0.2f units remain' % (
            self._ncols, numberUndefined, availWidth - totalDefined)

        #check columnwise in each None column to see if they are sizable.
        given = []
        sizeable = []
        unsizeable = []
        minimums = {}
        totalMinimum = 0
        elementWidth = self._elementWidth
        for colNo in xrange(self._ncols):
            w = W[colNo]
            if w is None or w=='*' or _endswith(w,'%'):
                siz = 1
                final = 0
                for rowNo in xrange(self._nrows):
                    value = self._cellvalues[rowNo][colNo]
                    style = self._cellStyles[rowNo][colNo]
                    pad = style.leftPadding+style.rightPadding
                    new = elementWidth(value,style)
                    if new:
                        new += pad
                    else:
                        new = pad
                    new += style.leftPadding+style.rightPadding
                    final = max(final, new)
                    siz = siz and self._canGetWidth(value) # irrelevant now?
                if siz:
                    sizeable.append(colNo)
                else:
                    unsizeable.append(colNo)
                minimums[colNo] = final
                totalMinimum += final
            else:
                given.append(colNo)
        if len(given) == self._ncols:
            return
        if verbose: print 'predefined width:   ',given
        if verbose: print 'uncomputable width: ',unsizeable
        if verbose: print 'computable width:   ',sizeable

        # how much width is left:
        remaining = availWidth - (totalMinimum + totalDefined)
        if remaining > 0:
            # we have some room left; fill it.
            definedPercentage = (totalDefined/availWidth)*100
            percentTotal += definedPercentage
            if numberUndefined and percentTotal < 100:
                undefined = numberGreedyUndefined or numberUndefined
                defaultWeight = (100-percentTotal)/undefined
                percentTotal = 100
                defaultDesired = (defaultWeight/percentTotal)*availWidth
            else:
                defaultWeight = defaultDesired = 1
            # we now calculate how wide each column wanted to be, and then
            # proportionately shrink that down to fit the remaining available
            # space.  A column may not shrink less than its minimum width,
            # however, which makes this a bit more complicated.
            desiredWidths = []
            totalDesired = 0
            effectiveRemaining = remaining
            for colNo, minimum in minimums.items():
                w = W[colNo]
                if _endswith(w,'%'):
                    desired = (float(w[:-1])/percentTotal)*availWidth
                elif w == '*':
                    desired = defaultDesired
                else:
                    desired = not numberGreedyUndefined and defaultDesired or 1
                if desired <= minimum:
                    W[colNo] = minimum
                else:
                    desiredWidths.append(
                        (desired-minimum, minimum, desired, colNo))
                    totalDesired += desired
                    effectiveRemaining += minimum
            if desiredWidths: # else we're done
                # let's say we have two variable columns.  One wanted
                # 88 points, and one wanted 264 points.  The first has a
                # minWidth of 66, and the second of 55.  We have 71 points
                # to divide up in addition to the totalMinimum (i.e.,
                # remaining==71).  Our algorithm tries to keep the proportion
                # of these variable columns.
                #
                # To do this, we add up the minimum widths of the variable
                # columns and the remaining width.  That's 192.  We add up the
                # totalDesired width.  That's 352.  That means we'll try to
                # shrink the widths by a proportion of 192/352--.545454.
                # That would make the first column 48 points, and the second
                # 144 points--adding up to the desired 192.
                #
                # Unfortunately, that's too small for the first column.  It
                # must be 66 points.  Therefore, we go ahead and save that
                # column width as 88 points.  That leaves (192-88==) 104
                # points remaining.  The proportion to shrink the remaining
                # column is (104/264), which, multiplied  by the desired
                # width of 264, is 104: the amount assigned to the remaining
                # column.
                proportion = effectiveRemaining/totalDesired
                # we sort the desired widths by difference between desired and
                # and minimum values, a value called "disappointment" in the
                # code.  This means that the columns with a bigger
                # disappointment will have a better chance of getting more of
                # the available space.
                desiredWidths.sort()
                finalSet = []
                for disappointment, minimum, desired, colNo in desiredWidths:
                    adjusted = proportion * desired
                    if adjusted < minimum:
                        W[colNo] = minimum
                        totalDesired -= desired
                        effectiveRemaining -= minimum
                        if totalDesired:
                            proportion = effectiveRemaining/totalDesired
                    else:
                        finalSet.append((minimum, desired, colNo))
                for minimum, desired, colNo in finalSet:
                    adjusted = proportion * desired
                    assert adjusted >= minimum
                    W[colNo] = adjusted
        else:
            for colNo, minimum in minimums.items():
                W[colNo] = minimum
        if verbose: print 'new widths are:', W
        self._argW = self._colWidths = W
        return W

    def minWidth(self):
        W = list(self._argW)
        width = 0
        elementWidth = self._elementWidth
        rowNos = xrange(self._nrows)
        values = self._cellvalues
        styles = self._cellStyles
        for colNo in xrange(len(W)):
            w = W[colNo]
            if w is None or w=='*' or _endswith(w,'%'):
                final = 0
                for rowNo in rowNos:
                    value = values[rowNo][colNo]
                    style = styles[rowNo][colNo]
                    new = (elementWidth(value,style)+
                           style.leftPadding+style.rightPadding)
                    final = max(final, new)
                width += final
            else:
                width += float(w)
        return width # XXX + 1/2*(left and right border widths)

    def _calcSpanRanges(self):
        """Work out rects for tables which do row and column spanning.

        This creates some mappings to let the later code determine
        if a cell is part of a "spanned" range.
        self._spanRanges shows the 'coords' in integers of each
        'cell range', or None if it was clobbered:
        (col, row) -> (col0, row0, col1, row1)

        Any cell not in the key is not part of a spanned region
        """
        self._spanRanges = spanRanges = {}
        for x in xrange(self._ncols):
            for y in xrange(self._nrows):
                spanRanges[x,y] = (x, y, x, y)
        self._colSpanCells = []
        self._rowSpanCells = []
        csa = self._colSpanCells.append
        rsa = self._rowSpanCells.append
        for (cmd, start, stop) in self._spanCmds:
            x0, y0 = start
            x1, y1 = stop

            #normalize
            if x0 < 0: x0 = x0 + self._ncols
            if x1 < 0: x1 = x1 + self._ncols
            if y0 < 0: y0 = y0 + self._nrows
            if y1 < 0: y1 = y1 + self._nrows
            if x0 > x1: x0, x1 = x1, x0
            if y0 > y1: y0, y1 = y1, y0

            if x0!=x1 or y0!=y1:
                if x0!=x1: #column span
                    for y in xrange(y0, y1+1):
                        for x in xrange(x0,x1+1):
                            csa((x,y))
                if y0!=y1: #row span
                    for y in xrange(y0, y1+1):
                        for x in xrange(x0,x1+1):
                            rsa((x,y))

                for y in xrange(y0, y1+1):
                    for x in xrange(x0,x1+1):
                        spanRanges[x,y] = None
                # set the main entry
                spanRanges[x0,y0] = (x0, y0, x1, y1)

    def _calcNoSplitRanges(self):
        """
        This creates some mappings to let the later code determine
        if a cell is part of a "nosplit" range.
        self._nosplitRanges shows the 'coords' in integers of each
        'cell range', or None if it was clobbered:
        (col, row) -> (col0, row0, col1, row1)

        Any cell not in the key is not part of a spanned region
        """
        self._nosplitRanges = nosplitRanges = {}
        for x in xrange(self._ncols):
            for y in xrange(self._nrows):
                nosplitRanges[x,y] = (x, y, x, y)
        self._colNoSplitCells = []
        self._rowNoSplitCells = []
        csa = self._colNoSplitCells.append
        rsa = self._rowNoSplitCells.append
        for (cmd, start, stop) in self._nosplitCmds:
            x0, y0 = start
            x1, y1 = stop

            #normalize
            if x0 < 0: x0 = x0 + self._ncols
            if x1 < 0: x1 = x1 + self._ncols
            if y0 < 0: y0 = y0 + self._nrows
            if y1 < 0: y1 = y1 + self._nrows
            if x0 > x1: x0, x1 = x1, x0
            if y0 > y1: y0, y1 = y1, y0

            if x0!=x1 or y0!=y1:
                #column span
                if x0!=x1:
                    for y in xrange(y0, y1+1):
                        for x in xrange(x0,x1+1):
                            csa((x,y))
                #row span
                if y0!=y1:
                    for y in xrange(y0, y1+1):
                        for x in xrange(x0,x1+1):
                            rsa((x,y))

                for y in xrange(y0, y1+1):
                    for x in xrange(x0,x1+1):
                        nosplitRanges[x,y] = None
                # set the main entry
                nosplitRanges[x0,y0] = (x0, y0, x1, y1)

    def _calcSpanRects(self):
        """Work out rects for tables which do row and column spanning.

        Based on self._spanRanges, which is already known,
        and the widths which were given or previously calculated,
        self._spanRects shows the real coords for drawing:
            
            (col, row) -> (x, y, width, height)

        for each cell.  Any cell which 'does not exist' as another
        has spanned over it will get a None entry on the right
        """
        spanRects = getattr(self,'_spanRects',{})
        hmax = getattr(self,'_hmax',None)
        longTable = self._longTableOptimize
        if spanRects and (longTable and hmax==self._hmax_spanRects or not longTable):
            return
        colpositions = self._colpositions
        rowpositions = self._rowpositions
        vBlocks = {}
        hBlocks = {}
        rlim = len(rowpositions)-1
        for (coord, value) in self._spanRanges.iteritems():
            if value is None:
                spanRects[coord] = None
            else:
                col0, row0, col1, row1 = value
                if row1>=rlim: continue
                col,row = coord
                if col1-col0>0:
                    for _ in xrange(col0+1,col1+1):
                        vBlocks.setdefault(colpositions[_],[]).append((rowpositions[row1+1],rowpositions[row0]))
                if row1-row0>0:
                    for _ in xrange(row0+1,row1+1):
                        hBlocks.setdefault(rowpositions[_],[]).append((colpositions[col0],colpositions[col1+1]))
                x = colpositions[col0]
                y = rowpositions[row1+1]
                width = colpositions[col1+1] - x
                height = rowpositions[row0] - y
                spanRects[coord] = (x, y, width, height)

        for _ in hBlocks, vBlocks:
            for value in _.values():
                value.sort()
        self._spanRects = spanRects
        self._vBlocks = vBlocks
        self._hBlocks = hBlocks
        self._hmax_spanRects = hmax

    def setStyle(self, tblstyle):
        if not isinstance(tblstyle,TableStyle):
            tblstyle = TableStyle(tblstyle)
        for cmd in tblstyle.getCommands():
            self._addCommand(cmd)
        for k,v in tblstyle._opts.items():
            setattr(self,k,v)
        for a in ('spaceBefore','spaceAfter'):
            if not hasattr(self,a) and hasattr(tblstyle,a):
                setattr(self,a,getattr(tblstyle,a))

    def _addCommand(self,cmd):
        if cmd[0] in ('BACKGROUND','ROWBACKGROUNDS','COLBACKGROUNDS'):
            self._bkgrndcmds.append(cmd)
        elif cmd[0] == 'SPAN':
            self._spanCmds.append(cmd)
        elif cmd[0] == 'NOSPLIT':
            # we expect op, start, stop
            self._nosplitCmds.append(cmd)
        elif _isLineCommand(cmd):
            # we expect op, start, stop, weight, colour, cap, dashes, join
            cmd = list(cmd)
            if len(cmd)<5: raise ValueError('bad line command '+str(cmd))

            #determine line cap value at position 5. This can be str or numeric.
            if len(cmd)<6:
                cmd.append(1)
            else:
                cap = _convert2int(cmd[5], LINECAPS, 0, 2, 'cap', cmd)
                cmd[5] = cap

            #dashes at index 6 - this is a dash array:
            if len(cmd)<7: cmd.append(None)

            #join mode at index 7 - can be str or numeric, look up as for caps
            if len(cmd)<8: cmd.append(1)
            else:
                join = _convert2int(cmd[7], LINEJOINS, 0, 2, 'join', cmd)
                cmd[7] = join

            #linecount at index 8.  Default is 1, set to 2 for double line.
            if len(cmd)<9: cmd.append(1)
            else:
                lineCount = cmd[8]
                if lineCount is None:
                    lineCount = 1
                    cmd[8] = lineCount
                assert lineCount >= 1
            #linespacing at index 9. Not applicable unless 2+ lines, defaults to line
            #width so you get a visible gap between centres
            if len(cmd)<10: cmd.append(cmd[3])
            else:
                space = cmd[9]
                if space is None:
                    space = cmd[3]
                    cmd[9] = space
            assert len(cmd) == 10

            self._linecmds.append(tuple(cmd))
        else:
            (op, (sc, sr), (ec, er)), values = cmd[:3] , cmd[3:]
            if sc < 0: sc = sc + self._ncols
            if ec < 0: ec = ec + self._ncols
            if sr < 0: sr = sr + self._nrows
            if er < 0: er = er + self._nrows
            for i in xrange(sr, er+1):
                for j in xrange(sc, ec+1):
                    _setCellStyle(self._cellStyles, i, j, op, values)

    def _drawLines(self):
        ccap, cdash, cjoin = None, None, None
        self.canv.saveState()
        for op, (sc,sr), (ec,er), weight, color, cap, dash, join, count, space in self._linecmds:
            if isinstance(sr,basestring) and sr.startswith('split'): continue
            if sc < 0: sc = sc + self._ncols
            if ec < 0: ec = ec + self._ncols
            if sr < 0: sr = sr + self._nrows
            if er < 0: er = er + self._nrows
            if cap!=None and ccap!=cap:
                self.canv.setLineCap(cap)
                ccap = cap
            if dash is None or dash == []:
                if cdash is not None:
                    self.canv.setDash()
                    cdash = None
            elif dash != cdash:
                self.canv.setDash(dash)
                cdash = dash
            if join is not None and cjoin!=join:
                self.canv.setLineJoin(join)
                cjoin = join
            getattr(self,_LineOpMap.get(op, '_drawUnknown' ))( (sc, sr), (ec, er), weight, color, count, space)
        self.canv.restoreState()
        self._curcolor = None

    def _drawUnknown(self,  start, end, weight, color, count, space):
        #we are only called from _drawLines which is one level up
        import sys
        op = sys._getframe(1).f_locals['op']
        raise ValueError("Unknown line command '%s'" % op)

    def _drawGrid(self, start, end, weight, color, count, space):
        self._drawBox( start, end, weight, color, count, space)
        self._drawInnerGrid( start, end, weight, color, count, space)

    def _drawBox(self,  start, end, weight, color, count, space):
        sc,sr = start
        ec,er = end
        self._drawHLines((sc, sr), (ec, sr), weight, color, count, space)
        self._drawHLines((sc, er+1), (ec, er+1), weight, color, count, space)
        self._drawVLines((sc, sr), (sc, er), weight, color, count, space)
        self._drawVLines((ec+1, sr), (ec+1, er), weight, color, count, space)

    def _drawInnerGrid(self, start, end, weight, color, count, space):
        sc,sr = start
        ec,er = end
        self._drawHLines((sc, sr+1), (ec, er), weight, color, count, space)
        self._drawVLines((sc+1, sr), (ec, er), weight, color, count, space)

    def _prepLine(self, weight, color):
        if color != self._curcolor:
            self.canv.setStrokeColor(color)
            self._curcolor = color
        if weight != self._curweight:
            self.canv.setLineWidth(weight)
            self._curweight = weight

    def _drawHLines(self, start, end, weight, color, count, space):
        sc,sr = start
        ec,er = end
        ecp = self._colpositions[sc:ec+2]
        rp = self._rowpositions[sr:er+1]
        if len(ecp)<=1 or len(rp)<1: return
        self._prepLine(weight, color)
        scp = ecp[0]
        ecp = ecp[-1]
        hBlocks = getattr(self,'_hBlocks',{})
        canvLine = self.canv.line
        if count == 1:
            for y in rp:
                _hLine(canvLine, scp, ecp, y, hBlocks)
        else:
            lf = lambda x0,y0,x1,y1,canvLine=canvLine, ws=weight+space, count=count: _multiLine(x0,x1,y0,canvLine,ws,count)
            for y in rp:
                _hLine(lf, scp, ecp, y, hBlocks)

    def _drawHLinesB(self, start, end, weight, color, count, space):
        sc,sr = start
        ec,er = end
        self._drawHLines((sc, sr+1), (ec, er+1), weight, color, count, space)

    def _drawVLines(self, start, end, weight, color, count, space):
        sc,sr = start
        ec,er = end
        erp = self._rowpositions[sr:er+2]
        cp  = self._colpositions[sc:ec+1]
        if len(erp)<=1 or len(cp)<1: return
        self._prepLine(weight, color)
        srp = erp[0]
        erp = erp[-1]
        vBlocks = getattr(self,'_vBlocks',{})
        canvLine = lambda y0, x0, y1, x1, _line=self.canv.line: _line(x0,y0,x1,y1)
        if count == 1:
            for x in cp:
                _hLine(canvLine, erp, srp, x, vBlocks)
        else:
            lf = lambda x0,y0,x1,y1,canvLine=canvLine, ws=weight+space, count=count: _multiLine(x0,x1,y0,canvLine,ws,count)
            for x in cp:
                _hLine(lf, erp, srp, x, vBlocks)

    def _drawVLinesA(self, start, end, weight, color, count, space):
        sc,sr = start
        ec,er = end
        self._drawVLines((sc+1, sr), (ec+1, er), weight, color, count, space)

    def wrap(self, availWidth, availHeight):
        self._calc(availWidth, availHeight)
        self.availWidth = availWidth
        return (self._width, self._height)

    def onSplit(self,T,byRow=1):
        '''
        This method will be called when the Table is split.
        Special purpose tables can override to do special stuff.
        '''
        pass

    def _cr_0(self,n,cmds):
        for c in cmds:
            c = tuple(c)
            (sc,sr), (ec,er) = c[1:3]
            if sr>=n: continue
            if er>=n: er = n-1
            self._addCommand((c[0],)+((sc, sr), (ec, er))+c[3:])

    def _cr_1_1(self,n,repeatRows, cmds):
        for c in cmds:
            c = tuple(c)
            (sc,sr), (ec,er) = c[1:3]
            if sr in ('splitfirst','splitlast'): self._addCommand(c)
            else:
                if sr>=0 and sr>=repeatRows and sr<n and er>=0 and er<n: continue
                if sr>=repeatRows and sr<n: sr=repeatRows
                elif sr>=repeatRows and sr>=n: sr=sr+repeatRows-n
                if er>=repeatRows and er<n: er=repeatRows
                elif er>=repeatRows and er>=n: er=er+repeatRows-n
                self._addCommand((c[0],)+((sc, sr), (ec, er))+c[3:])

    def _cr_1_0(self,n,cmds):
        for c in cmds:
            c = tuple(c)
            (sc,sr), (ec,er) = c[1:3]
            if sr in ('splitfirst','splitlast'): self._addCommand(c)
            else:
                if er>=0 and er<n: continue
                if sr>=0 and sr<n: sr=0
                if sr>=n: sr = sr-n
                if er>=n: er = er-n
                self._addCommand((c[0],)+((sc, sr), (ec, er))+c[3:])

    def _splitRows(self,availHeight):
        n=self._getFirstPossibleSplitRowPosition(availHeight)
        if n<=self.repeatRows: return []
        lim = len(self._rowHeights)
        if n==lim: return [self]

        repeatRows = self.repeatRows
        repeatCols = self.repeatCols
        splitByRow = self.splitByRow
        data = self._cellvalues

        #we're going to split into two superRows
        ident = self.ident
        if ident: ident = IdentStr(ident)
        R0 = self.__class__( data[:n], colWidths=self._colWidths, rowHeights=self._argH[:n],
                repeatRows=repeatRows, repeatCols=repeatCols,
                splitByRow=splitByRow, normalizedData=1, cellStyles=self._cellStyles[:n],
                ident=ident)

        #copy the commands

        A = []
        # hack up the line commands
        for op, (sc,sr), (ec,er), weight, color, cap, dash, join, count, space in self._linecmds:
            if isinstance(sr,basestring) and sr.startswith('split'):
                A.append((op,(sc,sr), (ec,sr), weight, color, cap, dash, join, count, space))
                if sr=='splitlast':
                    sr = er = n-1
                elif sr=='splitfirst':
                    sr = n
                    er = n

            if sc < 0: sc = sc + self._ncols
            if ec < 0: ec = ec + self._ncols
            if sr < 0: sr = sr + self._nrows
            if er < 0: er = er + self._nrows

            if op in ('BOX','OUTLINE','GRID'):
                if sr<n and er>=n:
                    # we have to split the BOX
                    A.append(('LINEABOVE',(sc,sr), (ec,sr), weight, color, cap, dash, join, count, space))
                    A.append(('LINEBEFORE',(sc,sr), (sc,er), weight, color, cap, dash, join, count, space))
                    A.append(('LINEAFTER',(ec,sr), (ec,er), weight, color, cap, dash, join, count, space))
                    A.append(('LINEBELOW',(sc,er), (ec,er), weight, color, cap, dash, join, count, space))
                    if op=='GRID':
                        A.append(('LINEBELOW',(sc,n-1), (ec,n-1), weight, color, cap, dash, join, count, space))
                        A.append(('LINEABOVE',(sc,n), (ec,n), weight, color, cap, dash, join, count, space))
                        A.append(('INNERGRID',(sc,sr), (ec,er), weight, color, cap, dash, join, count, space))
                else:
                    A.append((op,(sc,sr), (ec,er), weight, color, cap, dash, join, count, space))
            elif op in ('INNERGRID','LINEABOVE'):
                if sr<n and er>=n:
                    A.append(('LINEBELOW',(sc,n-1), (ec,n-1), weight, color, cap, dash, join, count, space))
                    A.append(('LINEABOVE',(sc,n), (ec,n), weight, color, cap, dash, join, count, space))
                A.append((op,(sc,sr), (ec,er), weight, color, cap, dash, join, count, space))
            elif op == 'LINEBELOW':
                if sr<n and er>=(n-1):
                    A.append(('LINEABOVE',(sc,n), (ec,n), weight, color, cap, dash, join, count, space))
                A.append((op,(sc,sr), (ec,er), weight, color))
            elif op == 'LINEABOVE':
                if sr<=n and er>=n:
                    A.append(('LINEBELOW',(sc,n-1), (ec,n-1), weight, color, cap, dash, join, count, space))
                A.append((op,(sc,sr), (ec,er), weight, color, cap, dash, join, count, space))
            else:
                A.append((op,(sc,sr), (ec,er), weight, color, cap, dash, join, count, space))

        R0._cr_0(n,A)
        R0._cr_0(n,self._bkgrndcmds)
        R0._cr_0(n,self._spanCmds)
        R0._cr_0(n,self._nosplitCmds)

        if ident: ident = IdentStr(ident)
        if repeatRows:
            #R1 = slelf.__class__(data[:repeatRows]+data[n:],self._argW,
            R1 = self.__class__(data[:repeatRows]+data[n:],colWidths=self._colWidths,
                    rowHeights=self._argH[:repeatRows]+self._argH[n:],
                    repeatRows=repeatRows, repeatCols=repeatCols,
                    splitByRow=splitByRow, normalizedData=1,
                    cellStyles=self._cellStyles[:repeatRows]+self._cellStyles[n:],
                    ident=ident,
                    )
            R1._cr_1_1(n,repeatRows,A)
            R1._cr_1_1(n,repeatRows,self._bkgrndcmds)
            R1._cr_1_1(n,repeatRows,self._spanCmds)
            R1._cr_1_1(n,repeatRows,self._nosplitCmds)
        else:
            #R1 = slelf.__class__(data[n:], self._argW, self._argH[n:],
            R1 = self.__class__(data[n:], colWidths=self._colWidths, rowHeights=self._argH[n:],
                    repeatRows=repeatRows, repeatCols=repeatCols,
                    splitByRow=splitByRow, normalizedData=1, cellStyles=self._cellStyles[n:],
                    ident=ident,
                    )
            R1._cr_1_0(n,A)
            R1._cr_1_0(n,self._bkgrndcmds)
            R1._cr_1_0(n,self._spanCmds)
            R1._cr_1_0(n,self._nosplitCmds)

        R0.hAlign = R1.hAlign = self.hAlign
        R0.vAlign = R1.vAlign = self.vAlign
        self.onSplit(R0)
        self.onSplit(R1)
        return [R0,R1]

    def _getRowImpossible(impossible,cells,ranges):
        for xy in cells:
            r=ranges[xy]
            if r!=None:
                y1,y2=r[1],r[3]
                if y1!=y2:
                    ymin=min(y1,y2) #normalize
                    ymax=max(y1,y2) #normalize
                    y=ymin+1
                    while 1:
                        if y>ymax: break
                        impossible[y]=None #split at position y is impossible because of overlapping rowspan
                        y+=1
    _getRowImpossible=staticmethod(_getRowImpossible)

    def _getFirstPossibleSplitRowPosition(self,availHeight):
        impossible={}
        if self._spanCmds:
            self._getRowImpossible(impossible,self._rowSpanCells,self._spanRanges)
        if self._nosplitCmds:
            self._getRowImpossible(impossible,self._rowNoSplitCells,self._nosplitRanges)
        h = 0
        n = 1
        split_at = 0 # from this point of view 0 is the first position where the table may *always* be splitted
        for rh in self._rowHeights:
            if h+rh>availHeight:
                break
            if n not in impossible:
                split_at=n
            h=h+rh
            n=n+1
        return split_at

    def split(self, availWidth, availHeight):
        self._calc(availWidth, availHeight)
        if self.splitByRow:
            if not rl_config.allowTableBoundsErrors and self._width>availWidth: return []
            return self._splitRows(availHeight)
        else:
            raise NotImplementedError

    def draw(self):
        self._curweight = self._curcolor = self._curcellstyle = None
        self._drawBkgrnd()
        if not self._spanCmds:
            # old fashioned case, no spanning, steam on and do each cell
            for row, rowstyle, rowpos, rowheight in zip(self._cellvalues, self._cellStyles, self._rowpositions[1:], self._rowHeights):
                for cellval, cellstyle, colpos, colwidth in zip(row, rowstyle, self._colpositions[:-1], self._colWidths):
                    self._drawCell(cellval, cellstyle, (colpos, rowpos), (colwidth, rowheight))
        else:
            # we have some row or col spans, need a more complex algorithm
            # to find the rect for each
            for rowNo in xrange(self._nrows):
                for colNo in xrange(self._ncols):
                    cellRect = self._spanRects[colNo, rowNo]
                    if cellRect is not None:
                        (x, y, width, height) = cellRect
                        cellval = self._cellvalues[rowNo][colNo]
                        cellstyle = self._cellStyles[rowNo][colNo]
                        self._drawCell(cellval, cellstyle, (x, y), (width, height))
        self._drawLines()

    def _drawBkgrnd(self):
        nrows = self._nrows
        ncols = self._ncols
        canv = self.canv
        colpositions = self._colpositions
        rowpositions = self._rowpositions
        rowHeights = self._rowHeights
        colWidths = self._colWidths
        spanRects = getattr(self,'_spanRects',None)
        for cmd, (sc, sr), (ec, er), arg in self._bkgrndcmds:
            if sc < 0: sc = sc + ncols
            if ec < 0: ec = ec + ncols
            if sr < 0: sr = sr + nrows
            if er < 0: er = er + nrows
            x0 = colpositions[sc]
            y0 = rowpositions[sr]
            x1 = colpositions[min(ec+1,ncols)]
            y1 = rowpositions[min(er+1,nrows)]
            w, h = x1-x0, y1-y0
            if hasattr(arg,'__call__'):
                arg(self,canv, x0, y0, w, h)
            elif cmd == 'ROWBACKGROUNDS':
                #Need a list of colors to cycle through.  The arguments
                #might be already colours, or convertible to colors, or
                # None, or the str 'None'.
                #It's very common to alternate a pale shade with None.
                colorCycle = map(colors.toColorOrNone, arg)
                count = len(colorCycle)
                rowCount = er - sr + 1
                for i in xrange(rowCount):
                    color = colorCycle[i%count]
                    h = rowHeights[sr + i]
                    if color:
                        canv.setFillColor(color)
                        canv.rect(x0, y0, w, -h, stroke=0,fill=1)
                    y0 = y0 - h
            elif cmd == 'COLBACKGROUNDS':
                #cycle through colours columnwise
                colorCycle = map(colors.toColorOrNone, arg)
                count = len(colorCycle)
                colCount = ec - sc + 1
                for i in xrange(colCount):
                    color = colorCycle[i%count]
                    w = colWidths[sc + i]
                    if color:
                        canv.setFillColor(color)
                        canv.rect(x0, y0, w, h, stroke=0,fill=1)
                    x0 = x0 +w
            else:   #cmd=='BACKGROUND'
                color = colors.toColorOrNone(arg)
                if color:
                    if ec==sc and er==sr and spanRects:
                        xywh = spanRects.get((sc,sr))
                        if xywh:
                            #it's a single cell
                            x0, y0, w, h = xywh
                    canv.setFillColor(color)
                    canv.rect(x0, y0, w, h, stroke=0,fill=1)

    def _drawCell(self, cellval, cellstyle, pos, size):
        colpos, rowpos = pos
        colwidth, rowheight = size
        if self._curcellstyle is not cellstyle:
            cur = self._curcellstyle
            if cur is None or cellstyle.color != cur.color:
                self.canv.setFillColor(cellstyle.color)
            if cur is None or cellstyle.leading != cur.leading or cellstyle.fontname != cur.fontname or cellstyle.fontsize != cur.fontsize:
                self.canv.setFont(cellstyle.fontname, cellstyle.fontsize, cellstyle.leading)
            self._curcellstyle = cellstyle

        just = cellstyle.alignment
        valign = cellstyle.valign
        if isinstance(cellval,(tuple,list,Flowable)):
            if not isinstance(cellval,(tuple,list)): cellval = (cellval,)
            # we assume it's a list of Flowables
            W = []
            H = []
            w, h = self._listCellGeom(cellval,colwidth,cellstyle,W=W, H=H,aH=rowheight)
            if valign=='TOP':
                y = rowpos + rowheight - cellstyle.topPadding
            elif valign=='BOTTOM':
                y = rowpos+cellstyle.bottomPadding + h
            else:
                y = rowpos+(rowheight+cellstyle.bottomPadding-cellstyle.topPadding+h)/2.0
            if cellval: y += cellval[0].getSpaceBefore()
            for v, w, h in zip(cellval,W,H):
                if just=='LEFT': x = colpos+cellstyle.leftPadding
                elif just=='RIGHT': x = colpos+colwidth-cellstyle.rightPadding - w
                elif just in ('CENTRE', 'CENTER'):
                    x = colpos+(colwidth+cellstyle.leftPadding-cellstyle.rightPadding-w)/2.0
                else:
                    raise ValueError('Invalid justification %s' % just)
                y -= v.getSpaceBefore()
                y -= h
                v.drawOn(self.canv,x,y)
                y -= v.getSpaceAfter()
        else:
            if just == 'LEFT':
                draw = self.canv.drawString
                x = colpos + cellstyle.leftPadding
            elif just in ('CENTRE', 'CENTER'):
                draw = self.canv.drawCentredString
                x = colpos+(colwidth+cellstyle.leftPadding-cellstyle.rightPadding)*0.5
            elif just == 'RIGHT':
                draw = self.canv.drawRightString
                x = colpos + colwidth - cellstyle.rightPadding
            elif just == 'DECIMAL':
                draw = self.canv.drawAlignedString
                x = colpos + colwidth - cellstyle.rightPadding
            else:
                raise ValueError('Invalid justification %s' % just)
            vals = str(cellval).split("\n")
            n = len(vals)
            leading = cellstyle.leading
            fontsize = cellstyle.fontsize
            if valign=='BOTTOM':
                y = rowpos + cellstyle.bottomPadding+n*leading-fontsize
            elif valign=='TOP':
                y = rowpos + rowheight - cellstyle.topPadding - fontsize
            elif valign=='MIDDLE':
                #tim roberts pointed out missing fontsize correction 2004-10-04
                y = rowpos + (cellstyle.bottomPadding + rowheight-cellstyle.topPadding+n*leading)/2.0 - fontsize
            else:
                raise ValueError("Bad valign: '%s'" % str(valign))

            for v in vals:
                draw(x, y, v)
                y -= leading
            onDraw = getattr(cellval,'onDraw',None)
            if onDraw:
                onDraw(self.canv,cellval.kind,cellval.label)

        if cellstyle.href:
            #external hyperlink
            self.canv.linkURL(cellstyle.href, (colpos, rowpos, colpos + colwidth, rowpos + rowheight), relative=1)
        if cellstyle.destination:
            #external hyperlink
            self.canv.linkRect("", cellstyle.destination, Rect=(colpos, rowpos, colpos + colwidth, rowpos + rowheight), relative=1)

_LineOpMap = {  'GRID':'_drawGrid',
                'BOX':'_drawBox',
                'OUTLINE':'_drawBox',
                'INNERGRID':'_drawInnerGrid',
                'LINEBELOW':'_drawHLinesB',
                'LINEABOVE':'_drawHLines',
                'LINEBEFORE':'_drawVLines',
                'LINEAFTER':'_drawVLinesA', }

class LongTable(Table):
    '''Henning von Bargen's changes will be active'''
    _longTableOptimize = 1

LINECOMMANDS = _LineOpMap.keys()

def _isLineCommand(cmd):
    return cmd[0] in LINECOMMANDS

def _setCellStyle(cellStyles, i, j, op, values):
    #new = CellStyle('<%d, %d>' % (i,j), cellStyles[i][j])
    #cellStyles[i][j] = new
    ## modify in place!!!
    new = cellStyles[i][j]
    if op == 'FONT':
        n = len(values)
        new.fontname = values[0]
        if n>1:
            new.fontsize = values[1]
            if n>2:
                new.leading = values[2]
            else:
                new.leading = new.fontsize*1.2
    elif op in ('FONTNAME', 'FACE'):
        new.fontname = values[0]
    elif op in ('SIZE', 'FONTSIZE'):
        new.fontsize = values[0]
    elif op == 'LEADING':
        new.leading = values[0]
    elif op == 'TEXTCOLOR':
        new.color = colors.toColor(values[0], colors.Color(0,0,0))
    elif op in ('ALIGN', 'ALIGNMENT'):
        new.alignment = values[0]
    elif op == 'VALIGN':
        new.valign = values[0]
    elif op == 'LEFTPADDING':
        new.leftPadding = values[0]
    elif op == 'RIGHTPADDING':
        new.rightPadding = values[0]
    elif op == 'TOPPADDING':
        new.topPadding = values[0]
    elif op == 'BOTTOMPADDING':
        new.bottomPadding = values[0]
    elif op == 'HREF':
        new.href = values[0]
    elif op == 'DESTINATION':
        new.destination = values[0]

GRID_STYLE = TableStyle(
    [('GRID', (0,0), (-1,-1), 0.25, colors.black),
     ('ALIGN', (1,1), (-1,-1), 'RIGHT')]
    )
BOX_STYLE = TableStyle(
    [('BOX', (0,0), (-1,-1), 0.50, colors.black),
     ('ALIGN', (1,1), (-1,-1), 'RIGHT')]
    )
LABELED_GRID_STYLE = TableStyle(
    [('INNERGRID', (0,0), (-1,-1), 0.25, colors.black),
     ('BOX', (0,0), (-1,-1), 2, colors.black),
     ('LINEBELOW', (0,0), (-1,0), 2, colors.black),
     ('LINEAFTER', (0,0), (0,-1), 2, colors.black),
     ('ALIGN', (1,1), (-1,-1), 'RIGHT')]
    )
COLORED_GRID_STYLE = TableStyle(
    [('INNERGRID', (0,0), (-1,-1), 0.25, colors.black),
     ('BOX', (0,0), (-1,-1), 2, colors.red),
     ('LINEBELOW', (0,0), (-1,0), 2, colors.black),
     ('LINEAFTER', (0,0), (0,-1), 2, colors.black),
     ('ALIGN', (1,1), (-1,-1), 'RIGHT')]
    )
LIST_STYLE = TableStyle(
    [('LINEABOVE', (0,0), (-1,0), 2, colors.green),
     ('LINEABOVE', (0,1), (-1,-1), 0.25, colors.black),
     ('LINEBELOW', (0,-1), (-1,-1), 2, colors.green),
     ('ALIGN', (1,1), (-1,-1), 'RIGHT')]
    )

# experimental iterator which can apply a sequence
# of colors e.g. Blue, None, Blue, None as you move
# down.
if __name__ == '__main__':
    from tests.test_platypus_tables import old_tables_test
    old_tables_test()
