+++ /dev/null
-# docbook.py: extension module
-# $Id: docbook.py 8353 2009-03-17 16:57:50Z mzjn $
-
-import sys
-import string
-import libxml2
-import libxslt
-import re
-import math
-
-# Some globals
-pixelsPerInch = 96.0
-unitHash = { 'in': pixelsPerInch,
- 'cm': pixelsPerInch / 2.54,
- 'mm': pixelsPerInch / 25.4,
- 'pc': (pixelsPerInch / 72.0) * 12,
- 'pt': pixelsPerInch / 72.0,
- 'px': 1 }
-
-# ======================================================================
-
-def adjustColumnWidths(ctx, nodeset):
- #
- # Small check to verify the context is correcly accessed
- #
- try:
- pctxt = libxslt.xpathParserContext(_obj=ctx)
- ctxt = pctxt.context()
- tctxt = ctxt.transformContext()
- except:
- pass
-
- # Get the nominal table width
- varString = lookupVariable(tctxt, "nominal.table.width", None)
- if varString == None:
- nominalWidth = 6 * pixelsPerInch;
- else:
- nominalWidth = convertLength(varString);
-
- # Get the requested table width
- tableWidth = lookupVariable(tctxt, "table.width", "100%")
-
- foStylesheet = (tctxt.variableLookup("stylesheet.result.type", None) == "fo")
-
- relTotal = 0
- relParts = []
-
- absTotal = 0
- absParts = []
-
- colgroup = libxml2.xmlNode(_obj = nodeset[0])
- # If this is an foStylesheet, we've been passed a list of fo:table-columns.
- # Otherwise we've been passed a colgroup that contains a list of cols.
- if foStylesheet:
- colChildren = colgroup
- else:
- colChildren = colgroup.children
-
- col = colChildren
- while col != None:
- if foStylesheet:
- width = col.prop("column-width")
- else:
- width = col.prop("width")
-
- if width == None:
- width = "1*"
-
- relPart = 0.0
- absPart = 0.0
- starPos = string.find(width, "*")
- if starPos >= 0:
- relPart, absPart = string.split(width, "*", 2)
- relPart = float(relPart)
- relTotal = relTotal + float(relPart)
- else:
- absPart = width
-
- pixels = convertLength(absPart)
- absTotal = absTotal + pixels
-
- relParts.append(relPart)
- absParts.append(pixels)
-
- col = col.next
-
- # Ok, now we have the relative widths and absolute widths in
- # two parallel arrays.
- #
- # - If there are no relative widths, output the absolute widths
- # - If there are no absolute widths, output the relative widths
- # - If there are a mixture of relative and absolute widths,
- # - If the table width is absolute, turn these all into absolute
- # widths.
- # - If the table width is relative, turn these all into absolute
- # widths in the nominalWidth and then turn them back into
- # percentages.
-
- widths = []
-
- if relTotal == 0:
- for absPart in absParts:
- if foStylesheet:
- inches = absPart / pixelsPerInch
- widths.append("%4.2fin" % inches)
- else:
- widths.append("%d" % absPart)
- elif absTotal == 0:
- for relPart in relParts:
- rel = relPart / relTotal * 100
- widths.append(rel)
- widths = correctRoundingError(widths)
- else:
- pixelWidth = nominalWidth
- if string.find(tableWidth, "%") < 0:
- pixelWidth = convertLength(tableWidth)
-
- if pixelWidth <= absTotal:
- print "Table is wider than table width"
- else:
- pixelWidth = pixelWidth - absTotal
-
- absTotal = 0
- for count in range(len(relParts)):
- rel = relParts[count] / relTotal * pixelWidth
- relParts[count] = rel + absParts[count]
- absTotal = absTotal + rel + absParts[count]
-
- if string.find(tableWidth, "%") < 0:
- for count in range(len(relParts)):
- if foStylesheet:
- pixels = relParts[count]
- inches = pixels / pixelsPerInch
- widths.append("%4.2fin" % inches)
- else:
- widths.append(relParts[count])
- else:
- for count in range(len(relParts)):
- rel = relParts[count] / absTotal * 100
- widths.append(rel)
- widths = correctRoundingError(widths)
-
- # Danger, Will Robinson! In-place modification of the result tree!
- # Side-effect free? We don' need no steenkin' side-effect free!
- count = 0
- col = colChildren
- while col != None:
- if foStylesheet:
- col.setProp("column-width", widths[count])
- else:
- col.setProp("width", widths[count])
-
- count = count+1
- col = col.next
-
- return nodeset
-
-def convertLength(length):
- # Given "3.4in" return the width in pixels
- global pixelsPerInch
- global unitHash
-
- m = re.search('([+-]?[\d\.]+)(\S+)', length)
- if m != None and m.lastindex > 1:
- unit = pixelsPerInch
- if unitHash.has_key(m.group(2)):
- unit = unitHash[m.group(2)]
- else:
- print "Unrecognized length: " + m.group(2)
-
- pixels = unit * float(m.group(1))
- else:
- pixels = 0
-
- return pixels
-
-def correctRoundingError(floatWidths):
- # The widths are currently floating point numbers, we have to truncate
- # them back to integers and then distribute the error so that they sum
- # to exactly 100%.
-
- totalWidth = 0
- widths = []
- for width in floatWidths:
- width = math.floor(width)
- widths.append(width)
- totalWidth = totalWidth + math.floor(width)
-
- totalError = 100 - totalWidth
- columnError = totalError / len(widths)
- error = 0
- for count in range(len(widths)):
- width = widths[count]
- error = error + columnError
- if error >= 1.0:
- adj = math.floor(error)
- error = error - adj
- widths[count] = "%d%%" % (width + adj)
- else:
- widths[count] = "%d%%" % width
-
- return widths
-
-def lookupVariable(tctxt, varName, default):
- varString = tctxt.variableLookup(varName, None)
- if varString == None:
- return default
-
- # If it's a list, get the first element
- if type(varString) == type([]):
- varString = varString[0]
-
- # If it's not a string, it must be a node, get its content
- if type(varString) != type(""):
- varString = varString.content
-
- return varString
-
-# ======================================================================
-# Random notes...
-
-#once you have a node which is a libxml2 python xmlNode wrapper all common
-#operations are possible:
-# .children .last .parent .next .prev .doc for navigation
-# .content .type for introspection
-# .prop("attribute_name") to lookup attribute values
-
-# # Now make a nodeset to return
-# # Danger, Will Robinson! This creates a memory leak!
-# newDoc = libxml2.newDoc("1.0")
-# newColGroup = newDoc.newDocNode(None, "colgroup", None)
-# newDoc.addChild(newColGroup)
-# col = colgroup.children
-# while col != None:
-# newCol = newDoc.newDocNode(None, "col", None)
-# newCol.copyPropList(col);
-# newCol.setProp("width", "4")
-# newColGroup.addChild(newCol)
-# col = col.next
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