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#
# A pair of directives for inserting content that will only appear in
# either html or latex.
#

from docutils.nodes import Body, Element
from docutils.parsers.rst import directives

class only_base(Body, Element):
    def dont_traverse(self, *args, **kwargs):
        return []

class html_only(only_base):
    pass

class latex_only(only_base):
    pass

def run(content, node_class, state, content_offset):
    text = '\n'.join(content)
    node = node_class(text)
    state.nested_parse(content, content_offset, node)
    return [node]

def html_only_directive(name, arguments, options, content, lineno,
                        content_offset, block_text, state, state_machine):
    return run(content, html_only, state, content_offset)

def latex_only_directive(name, arguments, options, content, lineno,
                         content_offset, block_text, state, state_machine):
    return run(content, latex_only, state, content_offset)

def builder_inited(app):
    if app.builder.name == 'html':
        latex_only.traverse = only_base.dont_traverse
    else:
        html_only.traverse = only_base.dont_traverse

def setup(app):
    app.add_directive('htmlonly', html_only_directive, True, (0, 0, 0))
    app.add_directive('latexonly', latex_only_directive, True, (0, 0, 0))
    app.add_node(html_only)
    app.add_node(latex_only)

    # This will *really* never see the light of day As it turns out,
    # this results in "broken" image nodes since they never get
    # processed, so best not to do this.
    # app.connect('builder-inited', builder_inited)

    # Add visit/depart methods to HTML-Translator:
    def visit_perform(self, node):
        pass
    def depart_perform(self, node):
        pass
    def visit_ignore(self, node):
        node.children = []
    def depart_ignore(self, node):
        node.children = []

    app.add_node(html_only, html=(visit_perform, depart_perform))
    app.add_node(html_only, latex=(visit_ignore, depart_ignore))
    app.add_node(latex_only, latex=(visit_perform, depart_perform))
    app.add_node(latex_only, html=(visit_ignore, depart_ignore))