/larpe/trunk/ezt.py - Larpe - Redmine Entr’ouvert

root / larpe / trunk / ezt.py @ 8843f79b

       #!/usr/bin/env python
       """ezt.py -- easy templating
       ezt templates are simply text files in whatever format you so desire
       (such as XML, HTML, etc.) which contain directives sprinkled
       throughout.  With these directives it is possible to generate the
       dynamic content from the ezt templates.
       These directives are enclosed in square brackets.  If you are a
       C-programmer, you might be familar with the #ifdef directives of the C
       preprocessor 'cpp'.  ezt provides a similar concept.  Additionally EZT
       has a 'for' directive, which allows it to iterate (repeat) certain
       subsections of the template according to sequence of data items
       provided by the application.
       The final rendering is performed by the method generate() of the Template
       class.  Building template instances can either be done using external
       EZT files (convention: use the suffix .ezt for such files):
           >>> template = Template("../templates/log.ezt")
       or by calling the parse() method of a template instance directly with
       a EZT template string:
           >>> template = Template()
           >>> template.parse('''<html><head>
           ... <title>[title_string]</title></head>
           ... <body><h1>[title_string]</h1>
           ...    [for a_sequence] <p>[a_sequence]</p>
           ...    [end] <hr>
           ...    The [person] is [if-any state]in[else]out[end].
           ... </body>
           ... </html>
           ... ''')
       The application should build a dictionary 'data' and pass it together
       with the output fileobject to the templates generate method:
           >>> data = {'title_string' : "A Dummy Page",
           ...         'a_sequence' : ['list item 1', 'list item 2', 'another element'],
           ...         'person': "doctor",
           ...         'state' : None }
           >>> import sys
           >>> template.generate(sys.stdout, data)
           <html><head>
           <title>A Dummy Page</title></head>
           <body><h1>A Dummy Page</h1>
            <p>list item 1</p>
            <p>list item 2</p>
            <p>another element</p>
            <hr>
           The doctor is out.
           </body>
           </html>
       Template syntax error reporting should be improved.  Currently it is
       very sparse (template line numbers would be nice):
           >>> Template().parse("[if-any where] foo [else] bar [end unexpected args]")
           Traceback (innermost last):
             File "<stdin>", line 1, in ?
             File "ezt.py", line 220, in parse
               self.program = self._parse(text)
             File "ezt.py", line 275, in _parse
               raise ArgCountSyntaxError(str(args[1:]))
           ArgCountSyntaxError: ['unexpected', 'args']
           >>> Template().parse("[if unmatched_end]foo[end]")
           Traceback (innermost last):
             File "<stdin>", line 1, in ?
             File "ezt.py", line 206, in parse
               self.program = self._parse(text)
             File "ezt.py", line 266, in _parse
               raise UnmatchedEndError()
           UnmatchedEndError
       Directives
       ==========
        Several directives allow the use of dotted qualified names refering to objects
        or attributes of objects contained in the data dictionary given to the
        .generate() method.
        Qualified names
        ---------------
          Qualified names have two basic forms: a variable reference, or a string
          constant. References are a name from the data dictionary with optional
          dotted attributes (where each intermediary is an object with attributes,
          of course).
          Examples:
            [varname]
            [ob.attr]
            ["string"]
        Simple directives
        -----------------
          [QUAL_NAME]
          This directive is simply replaced by the value of the qualified name.
          If the value is a number it's converted to a string before being
          outputted. If it is None, nothing is outputted. If it is a python file
          object (i.e. any object with a "read" method), it's contents are
          outputted. If it is a callback function (any callable python object
          is assumed to be a callback function), it is invoked and passed an EZT
          printer function as an argument.
          [QUAL_NAME QUAL_NAME ...]
          If the first value is a callback function, it is invoked with the
          output file pointer as a first argument, and the rest of the values as
          additional arguments.
          Otherwise, the first value defines a substitution format, specifying
          constant text and indices of the additional arguments. The arguments
          are substituted and the result is inserted into the output stream.
          Example:
            ["abc %0 def %1 ghi %0" foo bar.baz]
          Note that the first value can be any type of qualified name -- a string
          constant or a variable reference. Use %% to substitute a percent sign.
          Argument indices are 0-based.
          [include "filename"]  or [include QUAL_NAME]
          This directive is replaced by content of the named include file. Note
          that a string constant is more efficient -- the target file is compiled
          inline. In the variable form, the target file is compiled and executed
          at runtime.
        Block directives
        ----------------
          [for QUAL_NAME] ... [end]
          The text within the [for ...] directive and the corresponding [end]
          is repeated for each element in the sequence referred to by the
          qualified name in the for directive.  Within the for block this
          identifiers now refers to the actual item indexed by this loop
          iteration.
          [if-any QUAL_NAME [QUAL_NAME2 ...]] ... [else] ... [end]
          Test if any QUAL_NAME value is not None or an empty string or list.
          The [else] clause is optional.  CAUTION: Numeric values are
          converted to string, so if QUAL_NAME refers to a numeric value 0,
          the then-clause is substituted!
          [if-index INDEX_FROM_FOR odd] ... [else] ... [end]
          [if-index INDEX_FROM_FOR even] ... [else] ... [end]
          [if-index INDEX_FROM_FOR first] ... [else] ... [end]
          [if-index INDEX_FROM_FOR last] ... [else] ... [end]
          [if-index INDEX_FROM_FOR NUMBER] ... [else] ... [end]
          These five directives work similar to [if-any], but are only useful
          within a [for ...]-block (see above).  The odd/even directives are
          for example useful to choose different background colors for
          adjacent rows in a table.  Similar the first/last directives might
          be used to remove certain parts (for example "Diff to previous"
          doesn't make sense, if there is no previous).
          [is QUAL_NAME STRING] ... [else] ... [end]
          [is QUAL_NAME QUAL_NAME] ... [else] ... [end]
          The [is ...] directive is similar to the other conditional
          directives above.  But it allows to compare two value references or
          a value reference with some constant string.
          [define VARIABLE] ... [end]
          The [define ...] directive allows you to create and modify template
          variables from within the template itself.  Essentially, any data
          between inside the [define ...] and its matching [end] will be
          expanded using the other template parsing and output generation
          rules, and then stored as a string value assigned to the variable
          VARIABLE.  The new (or changed) variable is then available for use
          with other mechanisms such as [is ...] or [if-any ...], as long as
          they appear later in the template.
          [format STRING] ... [end]
          The format directive controls how the values substituted into
          templates are escaped before they are put into the output stream. It
          has no effect on the literal text of the templates, only the output
          from [QUAL_NAME ...] directives. STRING can be one of "raw" "html"
          or "xml". The "raw" mode leaves the output unaltered. The "html" and
          "xml" modes escape special characters using entity escapes (like
          &quot; and &gt;)
       """
+      #
       # Copyright (C) 2001-2005 Greg Stein. All Rights Reserved.
+      #
       # Redistribution and use in source and binary forms, with or without
       # modification, are permitted provided that the following conditions are
       # met:
+      #
       # * Redistributions of source code must retain the above copyright
       #   notice, this list of conditions and the following disclaimer.
+      #
       # * Redistributions in binary form must reproduce the above copyright
       #   notice, this list of conditions and the following disclaimer in the
       #   documentation and/or other materials provided with the distribution.
+      #
       # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
       # IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
       # THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
       # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
       # LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
       # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
       # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
       # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
       # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
       # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
       # POSSIBILITY OF SUCH DAMAGE.
+      #
+      #
       # This software is maintained by Greg and is available at:
       #    http://svn.webdav.org/repos/projects/ezt/trunk/
+      #
       import string
       import re
       from types import StringType, IntType, FloatType, LongType
       import os
       import cgi
       try:
         import cStringIO
       except ImportError:
         import StringIO
         cStringIO = StringIO
+      #
       # Formatting types
+      #
       FORMAT_RAW = 'raw'
       FORMAT_HTML = 'html'
       FORMAT_XML = 'xml'
+      #
       # This regular expression matches three alternatives:
       #   expr: DIRECTIVE | BRACKET | COMMENT
       #   DIRECTIVE: '[' ITEM (whitespace ITEM)* ']
       #   ITEM: STRING | NAME
       #   STRING: '"' (not-slash-or-dquote | '\' anychar)* '"'
       #   NAME: (alphanum | '_' | '-' | '.')+
       #   BRACKET: '[[]'
       #   COMMENT: '[#' not-rbracket* ']'
+      #
       # When used with the split() method, the return value will be composed of
       # non-matching text and the two paren groups (DIRECTIVE and BRACKET). Since
       # the COMMENT matches are not placed into a group, they are considered a
       # "splitting" value and simply dropped.
+      #
       _item = r'(?:"(?:[^\\"]|\\.)*"|[-\w.]+)'
       _re_parse = re.compile(r'\[(%s(?: +%s)*)\]|(\[\[\])|\[#[^\]]*\]' % (_item, _item))
       _re_args = re.compile(r'"(?:[^\\"]|\\.)*"|[-\w.]+')
       # block commands and their argument counts
       _block_cmd_specs = { 'if-index':2, 'for':1, 'is':2, 'define':1, 'format':1 }
       _block_cmds = _block_cmd_specs.keys()
       # two regular expresssions for compressing whitespace. the first is used to
       # compress any whitespace including a newline into a single newline. the
       # second regex is used to compress runs of whitespace into a single space.
       _re_newline = re.compile('[ \t\r\f\v]*\n\\s*')
       _re_whitespace = re.compile(r'\s\s+')
       # this regex is used to substitute arguments into a value. we split the value,
       # replace the relevant pieces, and then put it all back together. splitting
       # will produce a list of: TEXT ( splitter TEXT )*. splitter will be '%' or
       # an integer.
       _re_subst = re.compile('%(%|[0-9]+)')
       class Template:
         _printers = {
           FORMAT_RAW  : '_cmd_print',
           FORMAT_HTML : '_cmd_print_html',
           FORMAT_XML  : '_cmd_print_xml',
+          }
         def __init__(self, fname=None, compress_whitespace=1,
                      base_format=FORMAT_RAW):
           self.compress_whitespace = compress_whitespace
           if fname:
             self.parse_file(fname, base_format)
         def parse_file(self, fname, base_format=FORMAT_RAW):
           "fname -> a string object with pathname of file containg an EZT template."
           self.parse(_FileReader(fname), base_format)
         def parse(self, text_or_reader, base_format=FORMAT_RAW):
           """Parse the template specified by text_or_reader.
           The argument should be a string containing the template, or it should
           specify a subclass of ezt.Reader which can read templates. The base
           format for printing values is given by base_format.
           """
           if not isinstance(text_or_reader, Reader):
             # assume the argument is a plain text string
             text_or_reader = _TextReader(text_or_reader)
           printer = getattr(self, self._printers[base_format])
           self.program = self._parse(text_or_reader, base_printer=printer)
         def generate(self, fp, data):
           if hasattr(data, '__getitem__') or callable(getattr(data, 'keys', None)):
             # a dictionary-like object was passed. convert it to an
             # attribute-based object.
             class _data_ob:
               def __init__(self, d):
                 vars(self).update(d)
             data = _data_ob(data)
           ctx = _context()
           ctx.data = data
           ctx.for_index = { }
           ctx.defines = { }
           self._execute(self.program, fp, ctx)
         def _parse(self, reader, for_names=None, file_args=(), base_printer=None):
           """text -> string object containing the template.
           This is a private helper function doing the real work for method parse.
           It returns the parsed template as a 'program'.  This program is a sequence
           made out of strings or (function, argument) 2-tuples.
           Note: comment directives [# ...] are automatically dropped by _re_parse.
           """
           # parse the template program into: (TEXT DIRECTIVE BRACKET)* TEXT
           parts = _re_parse.split(reader.text)
           program = [ ]
           stack = [ ]
           if not for_names:
             for_names = [ ]
           if base_printer:
             printers = [ base_printer ]
           else:
             printers = [ self._cmd_print ]
           for i in range(len(parts)):
             piece = parts[i]
             which = i % 3  # discriminate between: TEXT DIRECTIVE BRACKET
             if which == 0:
               # TEXT. append if non-empty.
               if piece:
                 if self.compress_whitespace:
                   piece = _re_whitespace.sub(' ', _re_newline.sub('\n', piece))
                 program.append(piece)
             elif which == 2:
               # BRACKET directive. append '[' if present.
               if piece:
                 program.append('[')
             elif piece:
               # DIRECTIVE is present.
               args = _re_args.findall(piece)
               cmd = args[0]
               if cmd == 'else':
                 if len(args) > 1:
                   raise ArgCountSyntaxError(str(args[1:]))
                 ### check: don't allow for 'for' cmd
                 idx = stack[-1][1]
                 true_section = program[idx:]
                 del program[idx:]
                 stack[-1][3] = true_section
               elif cmd == 'end':
                 if len(args) > 1:
                   raise ArgCountSyntaxError(str(args[1:]))
                 # note: true-section may be None
                 try:
                   cmd, idx, args, true_section = stack.pop()
                 except IndexError:
                   raise UnmatchedEndError()
                 else_section = program[idx:]
                 if cmd == 'format':
                   printers.pop()
                 else:
                   func = getattr(self, '_cmd_' + re.sub('-', '_', cmd))
                   program[idx:] = [ (func, (args, true_section, else_section)) ]
                   if cmd == 'for':
                     for_names.pop()
               elif cmd in _block_cmds:
                 if len(args) > _block_cmd_specs[cmd] + 1:
                   raise ArgCountSyntaxError(str(args[1:]))
                 ### this assumes arg1 is always a ref unless cmd is 'define'
                 if cmd != 'define':
                   args[1] = _prepare_ref(args[1], for_names, file_args)
                 # handle arg2 for the 'is' command
                 if cmd == 'is':
                   args[2] = _prepare_ref(args[2], for_names, file_args)
                 elif cmd == 'for':
                   for_names.append(args[1][0])  # append the refname
                 elif cmd == 'format':
                   if args[1][0]:
                     raise BadFormatConstantError(str(args[1:]))
                   funcname = self._printers.get(args[1][1])
                   if not funcname:
                     raise UnknownFormatConstantError(str(args[1:]))
                   printers.append(getattr(self, funcname))
                 # remember the cmd, current pos, args, and a section placeholder
                 stack.append([cmd, len(program), args[1:], None])
               elif cmd == 'include':
                 if args[1][0] == '"':
                   include_filename = args[1][1:-1]
                   f_args = [ ]
                   for arg in args[2:]:
                     f_args.append(_prepare_ref(arg, for_names, file_args))
                   program.extend(self._parse(reader.read_other(include_filename),
                                              for_names, f_args, printers[-1]))
                 else:
                   if len(args) != 2:
                     raise ArgCountSyntaxError(str(args))
                   program.append((self._cmd_include,
                                   (_prepare_ref(args[1], for_names, file_args),
                                    reader)))
               elif cmd == 'if-any':
                 f_args = [ ]
                 for arg in args[1:]:
                   f_args.append(_prepare_ref(arg, for_names, file_args))
                 stack.append(['if-any', len(program), f_args, None])
               else:
                 # implied PRINT command
                 f_args = [ ]
                 for arg in args:
                   f_args.append(_prepare_ref(arg, for_names, file_args))
                 program.append((printers[-1], f_args))
           if stack:
             ### would be nice to say which blocks...
             raise UnclosedBlocksError()
           return program
         def _execute(self, program, fp, ctx):
           """This private helper function takes a 'program' sequence as created
           by the method '_parse' and executes it step by step.  strings are written
           to the file object 'fp' and functions are called.
           """
           for step in program:
             if isinstance(step, StringType):
               fp.write(step)
             else:
               step[0](step[1], fp, ctx)
         def _cmd_print(self, valref, fp, ctx):
           _write_value(valref, fp, ctx)
         def _cmd_print_html(self, valref, fp, ctx):
           _write_value(valref, fp, ctx, cgi.escape)
         def _cmd_print_xml(self, valref, fp, ctx):
           ### use the same quoting as HTML for now
           self._cmd_print_html(valref, fp, ctx)
         def _cmd_include(self, (valref, reader), fp, ctx):
           fname = _get_value(valref, ctx)
           ### note: we don't have the set of for_names to pass into this parse.
           ### I don't think there is anything to do but document it. we also
           ### don't have a current format (since that is a compile-time concept).
           self._execute(self._parse(reader.read_other(fname)), fp, ctx)
         def _cmd_if_any(self, args, fp, ctx):
           "If any value is a non-empty string or non-empty list, then T else F."
           (valrefs, t_section, f_section) = args
           value = 0
           for valref in valrefs:
             if _get_value(valref, ctx):
               value = 1
               break
           self._do_if(value, t_section, f_section, fp, ctx)
         def _cmd_if_index(self, args, fp, ctx):
           ((valref, value), t_section, f_section) = args
           list, idx = ctx.for_index[valref[0]]
           if value == 'even':
             value = idx % 2 == 0
           elif value == 'odd':
             value = idx % 2 == 1
           elif value == 'first':
             value = idx == 0
           elif value == 'last':
             value = idx == len(list)-1
           else:
             value = idx == int(value)
           self._do_if(value, t_section, f_section, fp, ctx)
         def _cmd_is(self, args, fp, ctx):
           ((left_ref, right_ref), t_section, f_section) = args
           value = _get_value(right_ref, ctx)
           value = string.lower(_get_value(left_ref, ctx)) == string.lower(value)
           self._do_if(value, t_section, f_section, fp, ctx)
         def _do_if(self, value, t_section, f_section, fp, ctx):
           if t_section is None:
             t_section = f_section
             f_section = None
           if value:
             section = t_section
           else:
             section = f_section
           if section is not None:
             self._execute(section, fp, ctx)
         def _cmd_for(self, args, fp, ctx):
           ((valref,), unused, section) = args
           list = _get_value(valref, ctx)
           if isinstance(list, StringType):
             raise NeedSequenceError()
           refname = valref[0]
           ctx.for_index[refname] = idx = [ list, 0 ]
           for item in list:
             self._execute(section, fp, ctx)
             idx[1] = idx[1] + 1
           del ctx.for_index[refname]
         def _cmd_define(self, args, fp, ctx):
           ((name,), unused, section) = args
           valfp = cStringIO.StringIO()
           if section is not None:
             self._execute(section, valfp, ctx)
           ctx.defines[name] = valfp.getvalue()
       def boolean(value):
         "Return a value suitable for [if-any bool_var] usage in a template."
         if value:
           return 'yes'
         return None
       def _prepare_ref(refname, for_names, file_args):
         """refname -> a string containing a dotted identifier. example:"foo.bar.bang"
         for_names -> a list of active for sequences.
         Returns a `value reference', a 3-tuple made out of (refname, start, rest),
         for fast access later.
         """
         # is the reference a string constant?
         if refname[0] == '"':
           return None, refname[1:-1], None
         parts = string.split(refname, '.')
         start = parts[0]
         rest = parts[1:]
         # if this is an include-argument, then just return the prepared ref
         if start[:3] == 'arg':
           try:
             idx = int(start[3:])
           except ValueError:
             pass
           else:
             if idx < len(file_args):
               orig_refname, start, more_rest = file_args[idx]
               if more_rest is None:
                 # the include-argument was a string constant
                 return None, start, None
               # prepend the argument's "rest" for our further processing
               rest[:0] = more_rest
               # rewrite the refname to ensure that any potential 'for' processing
               # has the correct name
               ### this can make it hard for debugging include files since we lose
               ### the 'argNNN' names
               if not rest:
                 return start, start, [ ]
               refname = start + '.' + string.join(rest, '.')
         if for_names:
           # From last to first part, check if this reference is part of a for loop
           for i in range(len(parts), 0, -1):
             name = string.join(parts[:i], '.')
             if name in for_names:
               return refname, name, parts[i:]
         return refname, start, rest
       def _get_value((refname, start, rest), ctx):
         """(refname, start, rest) -> a prepared `value reference' (see above).
         ctx -> an execution context instance.
         Does a name space lookup within the template name space.  Active
         for blocks take precedence over data dictionary members with the
         same name.
         """
         if rest is None:
           # it was a string constant
           return start
         # get the starting object
         if ctx.for_index.has_key(start):
           list, idx = ctx.for_index[start]
           ob = list[idx]
         elif ctx.defines.has_key(start):
           ob = ctx.defines[start]
         elif hasattr(ctx.data, start):
           ob = getattr(ctx.data, start)
         else:
           raise UnknownReference(refname)
         # walk the rest of the dotted reference
         for attr in rest:
           try:
             ob = getattr(ob, attr)
           except AttributeError:
             raise UnknownReference(refname)
         # make sure we return a string instead of some various Python types
         if isinstance(ob, IntType) \
                or isinstance(ob, LongType) \
                or isinstance(ob, FloatType):
           return str(ob)
         if ob is None:
           return ''
         # string or a sequence
         return ob
       def _write_value(valrefs, fp, ctx, format=lambda s: s):
         value = _get_value(valrefs[0], ctx)
         args = map(lambda valref, ctx=ctx: _get_value(valref, ctx), valrefs[1:])
         # if the value has a 'read' attribute, then it is a stream: copy it
         if hasattr(value, 'read'):
           while 1:
             chunk = value.read(16384)
             if not chunk:
               break
             fp.write(format(chunk))
         # value is a callback function: call with file pointer and extra args
         elif callable(value):
           apply(value, [fp] + args)
         # value is a substitution pattern
         elif args:
           parts = _re_subst.split(value)
           for i in range(len(parts)):
             piece = parts[i]
             if i%2 == 1 and piece != '%':
               idx = int(piece)
               if idx < len(args):
                 piece = args[idx]
               else:
                 piece = '<undef>'
             if format:
               fp.write(format(piece))
         # plain old value, write to output
         else:
           fp.write(format(value))
       class _context:
         """A container for the execution context"""
       class Reader:
         "Abstract class which allows EZT to detect Reader objects."
       class _FileReader(Reader):
         """Reads templates from the filesystem."""
         def __init__(self, fname):
           self.text = open(fname, 'rb').read()
           self._dir = os.path.dirname(fname)
         def read_other(self, relative):
           return _FileReader(os.path.join(self._dir, relative))
       class _TextReader(Reader):
         """'Reads' a template from provided text."""
         def __init__(self, text):
           self.text = text
         def read_other(self, relative):
           raise BaseUnavailableError()
       class EZTException(Exception):
         """Parent class of all EZT exceptions."""
       class ArgCountSyntaxError(EZTException):
         """A bracket directive got the wrong number of arguments."""
       class UnknownReference(EZTException):
         """The template references an object not contained in the data dictionary."""
       class NeedSequenceError(EZTException):
         """The object dereferenced by the template is no sequence (tuple or list)."""
       class UnclosedBlocksError(EZTException):
         """This error may be simply a missing [end]."""
       class UnmatchedEndError(EZTException):
         """This error may be caused by a misspelled if directive."""
       class BaseUnavailableError(EZTException):
         """Base location is unavailable, which disables includes."""
       class BadFormatConstantError(EZTException):
         """Format specifiers must be string constants."""
       class UnknownFormatConstantError(EZTException):
         """The format specifier is an unknown value."""
       # --- standard test environment ---
       def test_parse():
         assert _re_parse.split('[a]') == ['', '[a]', None, '']
         assert _re_parse.split('[a] [b]') == \
                ['', '[a]', None, ' ', '[b]', None, '']
         assert _re_parse.split('[a c] [b]') == \
                ['', '[a c]', None, ' ', '[b]', None, '']
         assert _re_parse.split('x [a] y [b] z') == \
                ['x ', '[a]', None, ' y ', '[b]', None, ' z']
         assert _re_parse.split('[a "b" c "d"]') == \
                ['', '[a "b" c "d"]', None, '']
         assert _re_parse.split(r'["a \"b[foo]" c.d f]') == \
                ['', '["a \\"b[foo]" c.d f]', None, '']
       def _test(argv):
         import doctest, ezt
         verbose = "-v" in argv
         return doctest.testmod(ezt, verbose=verbose)
       if __name__ == "__main__":
         # invoke unit test for this module:
         import sys
         sys.exit(_test(sys.argv)[0])

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