""" @package antlr3.dottreegenerator

@brief ANTLR3 runtime package, tree module

This module contains all support classes for AST construction and tree parsers.

"""

# begin[licence]

#

# [The "BSD licence"]

# Copyright (c) 2005-2008 Terence Parr

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# 1. Redistributions of source code must retain the above copyright

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#    documentation and/or other materials provided with the distribution.

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# end[licence]

# lot's of docstrings are missing, don't complain for now...

# pylint: disable-msg=C0111

from antlr3.tree import CommonTreeAdaptor

import stringtemplate3

class DOTTreeGenerator(object):

    """

    A utility class to generate DOT diagrams (graphviz) from

    arbitrary trees.  You can pass in your own templates and

    can pass in any kind of tree or use Tree interface method.

    """

    _treeST = stringtemplate3.StringTemplate(

        template=(

        "digraph {\n" +

        "  ordering=out;\n" +

        "  ranksep=.4;\n" +

        "  node [shape=plaintext, fixedsize=true, fontsize=11, fontname=\"Courier\",\n" +

        "        width=.25, height=.25];\n" +

        "  edge [arrowsize=.5]\n" +

        "  $nodes$\n" +

        "  $edges$\n" +

        "}\n")

        )

    _nodeST = stringtemplate3.StringTemplate(

        template="$name$ [label=\"$text$\"];\n"

        )

    _edgeST = stringtemplate3.StringTemplate(

        template="$parent$ -> $child$ // \"$parentText$\" -> \"$childText$\"\n"

        )

    def __init__(self):

        ## Track node to number mapping so we can get proper node name back

        self.nodeToNumberMap = {}

        ## Track node number so we can get unique node names

        self.nodeNumber = 0

    def toDOT(self, tree, adaptor=None, treeST=_treeST, edgeST=_edgeST):

        if adaptor is None:

            adaptor = CommonTreeAdaptor()

        treeST = treeST.getInstanceOf()

        self.nodeNumber = 0

        self.toDOTDefineNodes(tree, adaptor, treeST)

        self.nodeNumber = 0

        self.toDOTDefineEdges(tree, adaptor, treeST, edgeST)

        return treeST

    def toDOTDefineNodes(self, tree, adaptor, treeST, knownNodes=None):

        if knownNodes is None:

            knownNodes = set()

        if tree is None:

            return

        n = adaptor.getChildCount(tree)

        if n == 0:

            # must have already dumped as child from previous

            # invocation; do nothing

            return

        # define parent node

        number = self.getNodeNumber(tree)

        if number not in knownNodes:

            parentNodeST = self.getNodeST(adaptor, tree)

            treeST.setAttribute("nodes", parentNodeST)

            knownNodes.add(number)

        # for each child, do a "<unique-name> [label=text]" node def

        for i in range(n):

            child = adaptor.getChild(tree, i)

            number = self.getNodeNumber(child)

            if number not in knownNodes:

                nodeST = self.getNodeST(adaptor, child)

                treeST.setAttribute("nodes", nodeST)

                knownNodes.add(number)

            self.toDOTDefineNodes(child, adaptor, treeST, knownNodes)

    def toDOTDefineEdges(self, tree, adaptor, treeST, edgeST):

        if tree is None:

            return

        n = adaptor.getChildCount(tree)

        if n == 0:

            # must have already dumped as child from previous

            # invocation; do nothing

            return

        parentName = "n%d" % self.getNodeNumber(tree)

        # for each child, do a parent -> child edge using unique node names

        parentText = adaptor.getText(tree)

        for i in range(n):

            child = adaptor.getChild(tree, i)

            childText = adaptor.getText(child)

            childName = "n%d" % self.getNodeNumber(child)

            edgeST = edgeST.getInstanceOf()

            edgeST.setAttribute("parent", parentName)

            edgeST.setAttribute("child", childName)

            edgeST.setAttribute("parentText", parentText)

            edgeST.setAttribute("childText", childText)

            treeST.setAttribute("edges", edgeST)

            self.toDOTDefineEdges(child, adaptor, treeST, edgeST)

    def getNodeST(self, adaptor, t):

        text = adaptor.getText(t)

        nodeST = self._nodeST.getInstanceOf()

        uniqueName = "n%d" % self.getNodeNumber(t)

        nodeST.setAttribute("name", uniqueName)

        if text is not None:

            text = text.replace('"', r'\\"')

        nodeST.setAttribute("text", text)

        return nodeST

    def getNodeNumber(self, t):

        try:

            return self.nodeToNumberMap[t]

        except KeyError:

            self.nodeToNumberMap[t] = self.nodeNumber

            self.nodeNumber += 1

            return self.nodeNumber - 1

def toDOT(tree, adaptor=None, treeST=DOTTreeGenerator._treeST, edgeST=DOTTreeGenerator._edgeST):

    """

    Generate DOT (graphviz) for a whole tree not just a node.

    For example, 3+4*5 should generate:

    digraph {

        node [shape=plaintext, fixedsize=true, fontsize=11, fontname="Courier",

            width=.4, height=.2];

        edge [arrowsize=.7]

        "+"->3

        "+"->"*"

        "*"->4

        "*"->5

    }

    Return the ST not a string in case people want to alter.

    Takes a Tree interface object.

    Example of invokation:

        import antlr3

        import antlr3.extras

        input = antlr3.ANTLRInputStream(sys.stdin)

        lex = TLexer(input)

        tokens = antlr3.CommonTokenStream(lex)

        parser = TParser(tokens)

        tree = parser.e().tree

        print tree.toStringTree()

        st = antlr3.extras.toDOT(t)

        print st

    """

    gen = DOTTreeGenerator()

    return gen.toDOT(tree, adaptor, treeST, edgeST)