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Viewing changes to lib/lp/scripts/utilities/js/combo.py

[r=deryck][bug=803954] Bring lazr-js source into lp tree and package
        yui as a dependency

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lib/lp/scripts/utilities/js/combo.py
 
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import os
 
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import cgi
 
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import urlparse
 
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from jsbuild import CSSComboFile, JSComboFile
 
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def parse_url(url):
 
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    """Parse a combo URL.
 
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    Returns the list of arguments in the original order.
 
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    """
 
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    scheme, loc, path, query, frag = urlparse.urlsplit(url)
 
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    return parse_qs(query)
 
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def parse_qs(query):
 
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    """Parse a query string.
 
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    Returns the list of arguments in the original order.
 
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    """
 
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    params = cgi.parse_qsl(query, keep_blank_values=True)
 
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    return tuple([param for param, value in params])
 
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def combine_files(fnames, root, resource_prefix="",
 
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                  minify_css=True, rewrite_urls=True):
 
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    """Combine many files into one.
 
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    Returns an iterator with the combined content of all the
 
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    files. The relative path to root will be included as a comment
 
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    between each file.
 
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    """
 
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    combo_by_kind = {
 
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        ".css": CSSComboFile([], os.path.join(root, "combo.css"),
 
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                             resource_prefix, minify_css, rewrite_urls),
 
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        ".js": JSComboFile([], os.path.join(root, "combo.js")),
 
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    }
 
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    for fname in fnames:
 
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        combo = combo_by_kind.get(os.path.splitext(fname)[-1])
 
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        if combo is None:
 
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            continue
 
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        full = os.path.abspath(os.path.join(root, fname))
 
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        yield combo.get_file_header(full)
 
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        if not full.startswith(root) or not os.path.exists(full):
 
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            yield combo.get_comment("[missing]")
 
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        else:
 
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            f = open(full, "r")
 
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            content = f.read()
 
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            f.close()
 
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            yield combo.filter_file_content(content, full)
 
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def combo_app(root, resource_prefix="", minify_css=True, rewrite_urls=True):
 
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    """A simple YUI Combo Service WSGI app.
 
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    Serves any files under C{root}, setting an appropriate
 
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    C{Content-Type} header.
 
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    """
 
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    root = os.path.abspath(root)
 
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    def app(environ, start_response, root=root):
 
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        fnames = parse_qs(environ["QUERY_STRING"])
 
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        content_type = "text/plain"
 
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        if fnames:
 
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            if fnames[0].endswith(".js"):
 
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                content_type = "text/javascript"
 
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            elif fnames[0].endswith(".css"):
 
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                content_type = "text/css"
 
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        else:
 
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            start_response("404 Not Found", [("Content-Type", content_type)])
 
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            return ("Not Found",)
 
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        start_response("200 OK", [("Content-Type", content_type)])
 
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        return combine_files(fnames, root, resource_prefix,
 
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                             minify_css, rewrite_urls)
 
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    return app