Index: client/dom/scripts/templateloader.py |
=================================================================== |
--- client/dom/scripts/templateloader.py (revision 5796) |
+++ client/dom/scripts/templateloader.py (working copy) |
@@ -1,113 +0,0 @@ |
-#!/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) |