Rename client/{dom,html} to lib/{dom,html} .

client/dom/scripts/templateloader.py

-#!/usr/bin/python
-# Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
-# for details. All rights reserved. Use of this source code is governed by a
-# BSD-style license that can be found in the LICENSE file.
-
-# Template loader and preprocessor.
-#
-# Preprocessor language:
-#
-#   $if VAR
-#   $else
-#   $endif
-#
-# VAR must be defined in the conditions dictionary.
-
-import os
-
-class TemplateLoader(object):
-  """Loads template files from a path."""
-
-  def __init__(self, root, subpaths, conditions = {}):
-    """Initializes loader.
-
-    Args:
-      root - a string, the directory under which the templates are stored.
-      subpaths - a list of strings, subpaths of root in search order.
-      conditions - a dictionay from strings to booleans.  Any conditional
-        expression must be a key in the map.
-    """
-    self._root = root
-    self._subpaths = subpaths
-    self._conditions = conditions
-    self._cache = {}
-
-  def TryLoad(self, name):
-    """Returns content of template file as a string, or None of not found."""
-    if name in self._cache:
-      return self._cache[name]
-
-    for subpath in self._subpaths:
-      template_file = os.path.join(self._root, subpath, name)
-      if os.path.exists(template_file):
-        template = ''.join(open(template_file).readlines())
-        template = self._Preprocess(template, template_file)
-        self._cache[name] = template
-        return template
-
-    return None
-
-  def Load(self, name):
-    """Returns contents of template file as a string, or raises an exception."""
-    template = self.TryLoad(name)
-    if template is not None:  # Can be empty string
-      return template
-    raise Exception("Could not find template '%s' on %s / %s" % (
-        name, self._root, self._subpaths))
-
-  def _Preprocess(self, template, filename):
-    def error(lineno, message):
-      raise Exception('%s:%s: %s' % (filename, lineno, message))
-
-    lines = template.splitlines(True)
-    out = []
-
-    condition_stack = []
-    active = True
-    seen_else = False
-
-    for (lineno, full_line) in enumerate(lines):
-      line = full_line.strip()
-
-      if line.startswith('$'):
-        words = line.split()
-        directive = words[0]
-
-        if directive == '$if':
-          if len(words) != 2:
-            error(lineno, '$if does not have single variable')
-          variable = words[1]
-          if variable in self._conditions:
-            condition_stack.append((active, seen_else))
-            active = self._conditions[variable]
-            seen_else = False
-          else:
-            error(lineno, "Unknown $if variable '%s'" % variable)
-
-        elif directive == '$else':
-          if not condition_stack:
-            error(lineno, '$else without $if')
-          if seen_else:
-            raise error(lineno, 'Double $else')
-          seen_else = True
-          active = not active
-
-        elif directive == '$endif':
-          if not condition_stack:
-            error(lineno, '$endif without $if')
-          (active, seen_else) = condition_stack.pop()
-
-        else:
-          # Something else, like '$!MEMBERS'
-          if active:
-            out.append(full_line)
-
-      else:
-        if active:
-          out.append(full_line);
-        continue
-
-    if condition_stack:
-      error(len(lines), 'Unterminated $if')
-
-    return ''.join(out)