def _compile_pattern( self, pattern ):
        """`pattern` is URL routing pattern.

        This method compiles the pattern in three different ways and returns
        them as a tuple of (regex, tmpl, redict)

        `regex`,
            A regular expression string that can be used to match incoming
            request-url to resolve view-callable.

        `tmpl`,
            A template formating string that can be used to generate URLs by
            apps.

        `redict`,
            A dictionary of variable components in path segment and optional
            regular expression that must match its value. This can be used for
            validation during URL generation.
        """
        regex, tmpl, redict = r'^', '', {}
        segs = list( filter( None, pattern.split( URLSEP )))
        while segs :
            regex += URLSEP
            tmpl += URLSEP
            part = segs.pop(0)
            if not part : continue
            if part[0] == '*' :
                part = URLSEP.join( [part] + segs )
                prefx, name, reg, sufx = None, part[1:], r'.*', None
                segs = []
            else :
                prefx, interp, sufx = re_patt.match( part ).groups()
                if interp :
                    try : name, reg = interp[1:-1].split(',', 1)
                    except : name, reg = interp[1:-1], None
                else :
                    name, reg = None, None

            regex += prefx if prefx else r''
            if name and reg and sufx :
                regex += r'(?P<%s>%s(?=%s))%s' % (name, reg, sufx, sufx)
            elif name and reg :
                regex += r'(?P<%s>%s)' % (name, reg)
            elif name and sufx :
                regex += r'(?P<%s>.+(?=%s))%s' % (name, sufx, sufx)
            elif name :
                regex += r'(?P<%s>.+)' % (name,)
            elif sufx :
                regex += sufx
            tmpl += prefx if prefx else ''
            tmpl += '{' + name + '}' if name else ''
            tmpl += sufx if sufx else ''
            redict[ name ] = reg
        regex += '$'
        return regex, tmpl, redict
Example #2
0
    def _compile_pattern( self, pattern ):
        """`pattern` is URL routing pattern.

        This method compiles the pattern in three different ways and returns
        them as a tuple of (regex, tmpl, redict)

        `regex`,
            A regular expression string that can be used to match incoming
            request-url to resolve view-callable.
        `tmpl`,
            A template formating string that can be used to generate URLs by
            apps.
        `redict`,
            A dictionary of variable components in path segment and optional
            regular expression that must match its value. This can be used for
            validation during URL generation.
        """
        regex, tmpl, redict = r'^', '', {}
        segs = pattern.split( URLSEP )
        while segs :
            seg = segs.pop(0)
            if not seg : continue
            regex, tmpl = (regex + URLSEP), (tmpl + URLSEP)
            prefx, _, name, reg, sufx = re_patt.match( seg ).groups()
            if name[0] == '*' :
                rempath = URLSEP.join( [seg] + segs )
                prefx, _, name, reg, sufx = re_patt.match( rempath ).groups()
                segs = []
            reg = reg and reg[1:]

            regex += prefx if prefx else r''
            if name and reg and sufx :
                regex += r'(?P<%s>%s(?=%s))%s' % (name, reg, sufx, sufx)
            elif name and reg :
                regex += r'(?P<%s>%s)' % (name, reg)
            elif name and sufx :
                regex += r'(?P<%s>.+(?=%s))%s' % (name, sufx, sufx)
            elif name :
                regex += r'(?p<%s>.+)' % (name,)
            elif sufx :
                regex += sufx
            tmpl += prefx if prefx else ''
            tmpl += '{' + name + '}' if name else ''
            tmpl += sufx if sufx else ''
            redict[ name ] = reg
        regex += '$'
        return regex, tmpl, redict