"""
    vec2svg.py
    Copyright  2009 XEROX
"""

import libxml2
from optparse import OptionParser

sSVGNs = "svg"
sSVGNsURI = "http://www.w3.org/2000/svg"
gnsSVG = None 
def generatePath(doc,node):
    

    pathNode = libxml2.newNode("path")
    pathNode.setNs(gnsSVG)
        
    ctxt = doc.xpathNewContext()
    xpath  = "./M|L|C" 
    ctxt.setContextNode(node)
    lInstruction= ctxt.xpathEval(xpath)
    ctxt.xpathFreeContext()
            
    sPath=""
    for inst in lInstruction:
        if inst.name =="M" or inst.name =="L":
            sPath = sPath + "%s %g %g " % (inst.name, float(inst.prop("x")), float(inst.prop("y")))
        elif inst.name == "C":
            sPath = sPath + "%s %g %g %g %g %g %g " % (inst.name, float(inst.prop("x1")),\
            float(inst.prop("y1")), float(inst.prop("x2")),\
            float(inst.prop("y2")),float(inst.prop("x3")),float(inst.prop("y3")))
    
    pathNode.newProp("d", sPath)
    return pathNode
    
def generateSVG(node, doc):
    
    ## vectors
    ctxt = doc.xpathNewContext()
    xpath  = "./%s" % ("GROUP")
    ctxt.setContextNode(node)
    lGroup= ctxt.xpathEval(xpath)
    ctxt.xpathFreeContext()
    
    image = libxml2.newDoc("1.0")
    svgRoot = libxml2.newNode("svg")
    svgRoot.newNs(sSVGNsURI, None)
    svgRoot.newNs("http://www.w3.org/1999/xlink","xlink")
    svgRoot.setNs(gnsSVG)
    image.setRootElement(svgRoot)
    
    for elt in lGroup:
        svgg = libxml2.newNode("g")
        svgRoot.addChild(svgg)
        svgg.setNs(gnsSVG)
        svgg.setProp("style", elt.prop("style"))
        path = generatePath(doc,elt)
        svgg.addChild(path)
        
    return image


def loadDom(filename):
    doc =  libxml2.parseFile(filename)
    return doc

def add_option(parser,*args, **kwargs):
    """add a new command line option to the parser"""
    parser.add_option(*args, **kwargs)
    
def parseCommandLine(parser):
        (options, args) = parser.parse_args()
        dOptions = {}
        for k,v in options.__dict__.items():
            if v != None: dOptions[k] = v
        return dOptions
 
def writeDom(outFile,doc, bIndent=False):
    if bIndent:
        doc.saveFormatFile(outFile, bIndent)
    else: 
        doc.saveFile(outFile)
    
if __name__ == "__main__":
    
        dParams = {}
        usage="python vec2svg.py  -i inputFile -o outputFile"
        parser = OptionParser(usage, version="0.1")
        parser.description = ".vec to .svg conversion"
        add_option(parser,"-i", "--input", dest="input", default="", action="store", type="string", help="input file (.vec)", metavar="<file>")
        add_option(parser,"-o", "--output", dest="output", default="-", action="store", type="string", help="output file (SVG)", metavar="<file>")
        
        dParams = parseCommandLine(parser)
        bInput = "input" in dParams
        if bInput:
            inputFileName  = dParams["input"]
            print(inputFileName)
            bOutput = "output" in dParams
            if bOutput: 
                outputFileName = dParams["output"]
            else:
                output = "-"
            
            doc = loadDom(inputFileName)
            svgFile = generateSVG(doc.getRootElement(), doc)
            writeDom(outputFileName,svgFile)
            
        else:
            print(usage)