def _webpack_optimization(property_, version):
# this must be a webpack_config["optimization"]
def apply_legacy_uglifyjs_plugin(config):
inject_array_items_to_object_property_value(
config, asttypes.String('"plugins"'),
es5_single('[new webpack.optimize.UglifyJsPlugin({})]'))
if version < (4, 0, 0):
try:
# this indiscriminately extract an assignment that has
# "minimize": true
walker.extract(
property_.right, lambda node:
(isinstance(node, Assign) and isinstance(node.left, String) and
isinstance(node.right, Boolean) and node.left.value ==
'"minimize"' and node.right.value == 'true'))
except TypeError:
logger.info('dropping unsupported property for webpack %s: {%s}',
'.'.join(str(v) for v in version), property_)
else:
logger.info(
'converting unsupported property to a plugin for '
'webpack %s: {%s}', '.'.join(str(v) for v in version),
property_)
return apply_legacy_uglifyjs_plugin
return
return property_
def extract_webpack_config_object(fd):
tree = read_es5(fd)
obj = walker.extract(tree, lambda node: isinstance(node, asttypes.Object))
# this manipulates nodes in place to remove anything that cannot be
# JSON deserialized
# remove plugins
for node in walker.filter(
obj, lambda node:
(isinstance(node, asttypes.Assign) and
isinstance(node.right, asttypes.Array) and isinstance(
node.left, asttypes.String) and node.left.value == '"plugins"')):
node.right.items = []
return json.loads(str(obj))
def __str__(self):
ast, config_object_node = generate_ast_and_config_node(
_WEBPACK_KARMA_CONFIG_TEMPLATE)
karma_node = self.es5()
try:
webpack_object_node = walker.extract(
karma_node,
lambda node: (isinstance(node, Assign) and isinstance(
node.right, Object) and isinstance(node.left, String) and
node.left.value == '"webpack"')).right
except TypeError:
raise KeyError(
"'webpack' attribute missing in karma configuration object")
inject_array_items_to_object_property_value(
webpack_object_node,
asttypes.String('"plugins"'),
es5_single(_WEBPACK_KARMA_CONFIG_PLUGINS),
)
config_object_node.properties = karma_node.properties
return str(ast)
def es5_single(text):
return walker.extract(es5(text),
lambda node: isinstance(node, ExprStatement)).expr
def generate_ast_and_config_node(template, skip=0):
ast = es5(template)
config_object_node = walker.extract(ast,
lambda node: isinstance(node, Object),
skip=skip)
return ast, config_object_node