def get_code_for_attribute(self, attribute, value):
if attribute[0] == TAL_NS:
if attribute[1] in ['content', 'replace']:
(engine, value) = get_tales_engine(value)
if engine == 'python':
m = STRUCTURE_PREFIX.match(value)
if m is not None:
value = m.group(2)
self._assert_valid_python(value)
yield value
if attribute[1] == 'define':
for (scope, var, value) in parse_defines(value):
(engine, value) = get_tales_engine(value)
if engine == 'python':
self._assert_valid_python(value)
yield value
elif attribute[1] == 'repeat':
(engine, value) = get_tales_engine(value.split(None, 1)[1])
if engine == 'python':
self._assert_valid_python(value)
yield value
else:
try:
for source in get_python_expressions(value):
yield source
except SyntaxError:
print('Aborting due to Python syntax error in %s[%d]: %s',
self.filename, self.linenumber, value)
sys.exit(1)
def get_code_for_attribute(self, attribute, value):
if attribute[0] == TAL_NS:
if attribute[1] in ['content', 'replace']:
(engine, value) = get_tales_engine(value)
if engine == 'python':
m = STRUCTURE_PREFIX.match(value)
if m is not None:
value = m.group(2)
self._assert_valid_python(value)
yield value
if attribute[1] == 'define':
for (scope, var, value) in parse_defines(value):
(engine, value) = get_tales_engine(value)
if engine == 'python':
self._assert_valid_python(value)
yield value
elif attribute[1] == 'repeat':
(engine, value) = get_tales_engine(value.split(None, 1)[1])
if engine == 'python':
self._assert_valid_python(value)
yield value
else:
try:
for source in get_python_expressions(value):
yield source
except SyntaxError:
print('Aborting due to Python syntax error in %s[%d]: %s',
self.filename, self.linenumber, value)
sys.exit(1)
def get_code_for_attribute(self, attribute, value):
default_engine = self.config['default-engine']
if attribute[0] == TAL_NS:
if attribute[1] in ['content', 'replace']:
for (engine, value) in split_expression(value, default_engine):
if engine == 'python':
m = STRUCTURE_PREFIX.match(value)
if m is not None:
value = m.group(2)
m = ENGINE_PREFIX.match(value)
if (m is not None) and (m.group(1) == 'python'):
m = None
value = value.split(':', 1)[1]
if m is None:
value = '(%s)' % value
self._assert_valid_python(value)
yield value
if attribute[1] == 'define':
for (scope, var, value) in parse_defines(value):
for (engine,
value) in split_expression(value, default_engine):
if engine == 'python':
value = '(%s)' % value
self._assert_valid_python(value)
yield value
elif attribute[1] == 'repeat':
defines = parse_defines(value)
if len(defines) != 1:
print('Aborting due to syntax error in %s[%d]: %s' %
(self.filename, self.linenumber, value))
scope, var, value = defines[0]
for (engine, value) in split_expression(value, default_engine):
if engine == 'python':
self._assert_valid_python(value)
yield value
else:
try:
for source in get_python_expressions(value, default_engine):
yield source
except SyntaxError:
print('Aborting due to Python syntax error in %s[%d]: %s' %
(self.filename, self.linenumber, value))
sys.exit(1)
def get_code_for_attribute(self, attribute, value):
default_engine = self.config['default-engine']
if attribute[0] == TAL_NS:
if attribute[1] in ['content', 'replace']:
for (engine, value) in split_expression(value, default_engine):
if engine == 'python':
m = STRUCTURE_PREFIX.match(value)
if m is not None:
value = m.group(2)
m = ENGINE_PREFIX.match(value)
if (m is not None) and (m.group(1) == 'python'):
m = None
value = value.split(':', 1)[1]
if m is None:
value = '(%s)' % value
self._assert_valid_python(value)
yield value
if attribute[1] == 'define':
for (scope, var, value) in parse_defines(value):
for (engine, value) in split_expression(value, default_engine):
if engine == 'python':
value = '(%s)' % value
self._assert_valid_python(value)
yield value
elif attribute[1] == 'repeat':
defines = parse_defines(value)
if len(defines) != 1:
print('Aborting due to syntax error in %s[%d]: %s' % (
self.filename, self.linenumber, value))
scope, var, value = defines[0]
for (engine, value) in split_expression(value, default_engine):
if engine == 'python':
self._assert_valid_python(value)
yield value
else:
try:
for source in get_python_expressions(value, default_engine):
yield source
except SyntaxError:
print('Aborting due to Python syntax error in %s[%d]: %s' %
(self.filename, self.linenumber, value))
sys.exit(1)
def get_code_for_attribute(self, attribute, value):
if attribute[0] == TAL_NS:
if attribute[1] in ['content', 'replace']:
yield value
if attribute[1] == 'define':
for (scope, var, value) in parse_defines(value):
yield value
elif attribute[1] == 'repeat':
yield value.split(None, 1)[1]
else:
for source in EXPRESSION.findall(value):
yield source
def get_code_for_attribute(self, attribute, value):
if attribute[0] == TAL_NS:
if attribute[1] in ['content', 'replace']:
for exp in self.iter_python_expressions(value):
yield exp
if attribute[1] == 'define':
for (scope, var, value) in parse_defines(value):
for exp in self.iter_python_expressions(value):
yield value
elif attribute[1] == 'repeat':
yield REPEAT_EXPR.match(value.strip()).group('expr')
else:
for source in EXPRESSION.findall(value):
for exp in self.iter_python_expressions(source):
yield exp
def prev_visit_element(self, start, end, children):
ns = start['ns_attrs']
for (prefix, attr), encoded in tuple(ns.items()):
if prefix == TAL:
ns[prefix, attr] = decode_htmlentities(encoded)
# Validate namespace attributes
validate_attributes(ns, TAL, tal.WHITELIST)
validate_attributes(ns, I18N, i18n.WHITELIST)
# Check attributes for language errors
self._check_attributes(start['namespace'], ns)
# Remember whitespace for item repetition
if self._last is not None:
self._whitespace = "\n" + " " * len(self._last.rsplit('\n', 1)[-1])
# Set element-local whitespace
whitespace = self._whitespace
# Set up switch
try:
clause = ns[TAL, 'switch']
except KeyError:
switch = None
else:
switch = nodes.Value(clause)
self._switches.append(switch)
body = []
content = nodes.Sequence(body)
# tal:content
try:
clause = ns[TAL, 'content']
except KeyError:
pass
else:
key, value = tal.parse_substitution(clause)
xlate = True if ns.get((I18N, 'translate')) == '' else False
content = self._make_content_node(value, content, key, xlate)
if end is None:
# Make sure start-tag has opening suffix.
start['suffix'] = ">"
# Explicitly set end-tag.
end = {
'prefix': '</',
'name': start['name'],
'space': '',
'suffix': '>'
}
# i18n:translate
try:
clause = ns[I18N, 'translate']
except KeyError:
pass
else:
dynamic = ns.get((TAL, 'content')) or ns.get((TAL, 'replace'))
if not dynamic:
content = nodes.Translate(clause, content)
# tal:attributes
try:
clause = ns[TAL, 'attributes']
except KeyError:
TAL_ATTRIBUTES = {}
else:
TAL_ATTRIBUTES = tal.parse_attributes(clause)
# i18n:attributes
try:
clause = ns[I18N, 'attributes']
except KeyError:
I18N_ATTRIBUTES = {}
else:
I18N_ATTRIBUTES = i18n.parse_attributes(clause)
# Prepare attributes from TAL language
prepared = tal.prepare_attributes(
start['attrs'], TAL_ATTRIBUTES,
I18N_ATTRIBUTES, ns, self.DROP_NS
)
# Create attribute nodes
STATIC_ATTRIBUTES = self._create_static_attributes(prepared)
ATTRIBUTES = self._create_attributes_nodes(
prepared, I18N_ATTRIBUTES
)
# Start- and end nodes
start_tag = nodes.Start(
start['name'],
self._maybe_trim(start['prefix']),
self._maybe_trim(start['suffix']),
ATTRIBUTES
)
stag = start_tag
end_tag = nodes.End(
end['name'],
end['space'],
self._maybe_trim(end['prefix']),
self._maybe_trim(end['suffix']),
) if end is not None else None
# tal:omit-tag
try:
clause = ns[TAL, 'omit-tag']
except KeyError:
omit = False
else:
clause = clause.strip()
if clause == "":
omit = True
else:
expression = nodes.Negate(nodes.Value(clause))
omit = expression
# Wrap start- and end-tags in condition
start_tag = nodes.Condition(expression, start_tag)
if end_tag is not None:
end_tag = nodes.Condition(expression, end_tag)
if omit is True or start['namespace'] in self.DROP_NS:
inner = content
else:
inner = nodes.Element(
start_tag,
end_tag,
content,
)
# Assign static attributes dictionary to "attrs" value
inner = nodes.Define(
[nodes.Alias(["attrs"], STATIC_ATTRIBUTES)],
inner,
)
if omit is not False:
inner = nodes.Cache([omit], inner)
# tal:replace
try:
clause = ns[TAL, 'replace']
except KeyError:
pass
else:
key, value = tal.parse_substitution(clause)
xlate = True if ns.get((I18N, 'translate')) == '' else False
inner = self._make_content_node(value, inner, key, xlate)
# tal:define
try:
clause = ns[TAL, 'define']
except KeyError:
DEFINE = skip
else:
defines = tal.parse_defines(clause)
if defines is None:
raise ParseError("Invalid define syntax.", clause)
DEFINE = partial(
nodes.Define,
[nodes.Assignment(
names, nodes.Value(expr), context == "local")
for (context, names, expr) in defines],
)
# tal:case
try:
clause = ns[TAL, 'case']
except KeyError:
CASE = skip
else:
value = nodes.Value(clause)
for switch in reversed(self._switches):
if switch is not None:
break
else:
raise LanguageError(
"Must define switch on a parent element.", clause
)
CASE = lambda node: nodes.Define(
[nodes.Assignment(["default"], switch, True)],
nodes.Condition(
nodes.Equality(switch, value),
node,
)
)
# tal:repeat
try:
clause = ns[TAL, 'repeat']
except KeyError:
REPEAT = skip
else:
defines = tal.parse_defines(clause)
assert len(defines) == 1
context, names, expr = defines[0]
expression = nodes.Value(expr)
REPEAT = partial(
nodes.Repeat,
names,
expression,
context == "local",
whitespace
)
# tal:condition
try:
clause = ns[TAL, 'condition']
except KeyError:
CONDITION = skip
else:
expression = nodes.Value(clause)
CONDITION = partial(nodes.Condition, expression)
# tal:switch
if switch is None:
SWITCH = skip
else:
SWITCH = partial(nodes.Cache, [switch])
# i18n:domain
try:
clause = ns[I18N, 'domain']
except KeyError:
DOMAIN = skip
else:
DOMAIN = partial(nodes.Domain, clause)
# i18n:name
try:
clause = ns[I18N, 'name']
except KeyError:
NAME = skip
else:
NAME = partial(nodes.Name, clause)
# The "slot" node next is the first node level that can serve
# as a macro slot
slot = wrap(
inner,
DEFINE,
CASE,
CONDITION,
REPEAT,
SWITCH,
DOMAIN,
)
slot = wrap(
slot,
NAME
)
# tal:on-error
try:
clause = ns[TAL, 'on-error']
except KeyError:
ON_ERROR = skip
else:
key, value = tal.parse_substitution(clause)
translate = True if ns.get((I18N, 'translate')) == '' else False
fallback = self._make_content_node(value, None, key, translate)
if omit is False and start['namespace'] not in self.DROP_NS:
fallback = nodes.Element(
start_tag,
end_tag,
fallback,
)
ON_ERROR = partial(nodes.OnError, fallback, 'error')
clause = ns.get((META, 'interpolation'))
if clause in ('false', 'off'):
INTERPOLATION = False
elif clause in ('true', 'on'):
INTERPOLATION = True
elif clause is None:
INTERPOLATION = self._interpolation[-1]
else:
raise LanguageError("Bad interpolation setting.", clause)
self._interpolation.append(INTERPOLATION)
# Visit content body
for child in children:
body.append(self.visit(*child))
self._switches.pop()
self._interpolation.pop()
slot = wrap(
slot,
ON_ERROR
)
stag.replayable = False
if self.binds:
try:
bind_replay_clause = ns[(PRAMTAL, "bind-replay")]
splits = bind_replay_clause.split(" ")
if len(splits) != 2:
raise LanguageError("Invalid bind replay.", bind_replay_clause)
events = splits[1].split(";")
slot = BindReplay(splits[0], events, slot)
stag.replayable = True
except KeyError:
pass
if self.binds:
try:
bind_clause = ns[(PRAMTAL, "bind-change")]
bind_splits = bind_clause.strip().split(" ")
if len(bind_splits) > 3:
raise LanguageError("Invalid bind syntax.", bind_clause)
if not "#" in bind_splits[0]:
raise LanguageError("No bind model target specified.", bind_clause)
first_split = bind_splits[0][1:]
if "." in first_split:
bind_model,bind_ons = first_split.split(".", 1)
bind_ons = bind_ons.strip().split(".")
else:
bind_model = first_split
bind_ons = []
bind_attrs = []
if len(bind_splits) > 1:
bind_attrs = bind_splits[1].split(";")
stag.replayable = True
slot = BindChange(bind_model, bind_ons, bind_attrs, slot )
except KeyError:
pass
stag.repeatable = False
if self.binds:
try:
bind_repeat_clause = ns[(PRAMTAL, "bind-repeat")]
except KeyError:
pass
else:
splits = bind_repeat_clause.split(" ")
if len(splits) != 2:
raise LanguageError("Invalid define model.", bind_repeat_clause)
if not splits[0].startswith("#"):
raise LanguageError("need # in alias.", bind_repeat_clause)
slot = BindRepeat(splits[0][1:], splits[1], slot)
stag.repeatable = True
try:
define_model_clause = ns[(PRAMTAL, "define-model")]
except KeyError:
pass
else:
pairs = define_model_clause.split(";")
models = []
for pair in pairs:
pair = pair.strip()
splits = pair.split(" ")
if len(splits) != 2:
raise LanguageError("Invalid define model.", pair)
if not splits[0].startswith("#"):
raise LanguageError("need # in alias.", pair)
models.append((splits[0][1:], splits[1]))
slot = DefineModel(models, slot)
return slot
def visit_element(self, start, end, children):
ns = start['ns_attrs']
ADDITIONAL_ATTRS = {}
for (prefix, attr), encoded in tuple(ns.items()):
if prefix == TAL:
ns[prefix, attr] = decode_htmlentities(encoded)
# Validate namespace attributes
validate_attributes(ns, TAL, tal.WHITELIST)
validate_attributes(ns, METAL, metal.WHITELIST)
validate_attributes(ns, I18N, i18n.WHITELIST)
# Check attributes for language errors
self._check_attributes(start['namespace'], ns)
# Remember whitespace for item repetition
if self._last is not None:
self._whitespace = "\n" + " " * len(self._last.rsplit('\n', 1)[-1])
# Set element-local whitespace
whitespace = self._whitespace
# Set up switch
try:
clause = ns[TAL, 'switch']
except KeyError:
switch = None
else:
value = nodes.Value(clause)
switch = value, nodes.Copy(value)
self._switches.append(switch)
body = []
# Include macro
use_macro = ns.get((METAL, 'use-macro'))
extend_macro = ns.get((METAL, 'extend-macro'))
if use_macro or extend_macro:
omit = True
slots = []
self._use_macro.append(slots)
if use_macro:
inner = nodes.UseExternalMacro(
nodes.Value(use_macro), slots, False
)
else:
inner = nodes.UseExternalMacro(
nodes.Value(extend_macro), slots, True
)
# -or- include tag
else:
content = nodes.Sequence(body)
# tal:content
try:
clause = ns[TAL, 'content']
except KeyError:
pass
else:
clause = self.get_semantic(clause, ns, 'content')
key, value = tal.parse_substitution(clause)
xlate = True if ns.get((I18N, 'translate')) == '' else False
content = self._make_content_node(value, content, key, xlate)
if end is None:
# Make sure start-tag has opening suffix.
start['suffix'] = ">"
# Explicitly set end-tag.
end = {
'prefix': '</',
'name': start['name'],
'space': '',
'suffix': '>'
}
# i18n:translate
try:
clause = ns[I18N, 'translate']
except KeyError:
pass
else:
dynamic = ns.get((TAL, 'content')) or ns.get((TAL, 'replace'))
if not dynamic:
content = nodes.Translate(clause, content)
# tal:attributes
try:
clause = ns[TAL, 'attributes']
except KeyError:
TAL_ATTRIBUTES = []
else:
TAL_ATTRIBUTES = tal.parse_attributes(clause)
# i18n:attributes
try:
clause = ns[I18N, 'attributes']
except KeyError:
I18N_ATTRIBUTES = {}
else:
I18N_ATTRIBUTES = i18n.parse_attributes(clause)
# Prepare attributes from TAL language
prepared = tal.prepare_attributes(
start['attrs'], TAL_ATTRIBUTES,
I18N_ATTRIBUTES, ns, self.DROP_NS
)
# Create attribute nodes
STATIC_ATTRIBUTES = self._create_static_attributes(prepared)
ATTRIBUTES = self._create_attributes_nodes(
prepared, I18N_ATTRIBUTES, STATIC_ATTRIBUTES
)
# Start- and end nodes
start_tag = nodes.Start(
start['name'],
self._maybe_trim(start['prefix']),
self._maybe_trim(start['suffix']),
ATTRIBUTES
)
end_tag = nodes.End(
end['name'],
end['space'],
self._maybe_trim(end['prefix']),
self._maybe_trim(end['suffix']),
) if end is not None else None
# tal:omit-tag
try:
clause = ns[TAL, 'omit-tag']
except KeyError:
omit = False
else:
clause = clause.strip()
if clause == "":
omit = True
else:
expression = nodes.Negate(nodes.Value(clause))
omit = expression
# Wrap start- and end-tags in condition
start_tag = nodes.Condition(expression, start_tag)
if end_tag is not None:
end_tag = nodes.Condition(expression, end_tag)
if omit is True or start['namespace'] in self.DROP_NS:
inner = content
else:
inner = nodes.Element(
start_tag,
end_tag,
content,
)
# Assign static attributes dictionary to "attrs" value
inner = nodes.Define(
[nodes.Alias(["attrs"], STATIC_ATTRIBUTES or EMPTY_DICT)],
inner,
)
if omit is not False:
inner = nodes.Cache([omit], inner)
# tal:replace
try:
clause = ns[TAL, 'replace']
except KeyError:
pass
else:
clause = self.get_semantic(clause, ns, 'replace')
key, value = tal.parse_substitution(clause)
xlate = True if ns.get((I18N, 'translate')) == '' else False
inner = self._make_content_node(value, inner, key, xlate)
# metal:define-slot
try:
clause = ns[METAL, 'define-slot']
except KeyError:
DEFINE_SLOT = skip
else:
DEFINE_SLOT = partial(nodes.DefineSlot, clause)
# tal:define
try:
clause = ns[TAL, 'define']
except KeyError:
DEFINE = skip
else:
defines = tal.parse_defines(clause)
if defines is None:
raise ParseError("Invalid define syntax.", clause)
DEFINE = partial(
nodes.Define,
[nodes.Assignment(
names, nodes.Value(expr), context == "local")
for (context, names, expr) in defines],
)
# tal:case
try:
clause = ns[TAL, 'case']
except KeyError:
CASE = skip
else:
value = nodes.Value(clause)
for switch in reversed(self._switches):
if switch is not None:
break
else:
raise LanguageError(
"Must define switch on a parent element.", clause
)
CASE = lambda node: nodes.Define(
[nodes.Alias(["default"], switch[1], False)],
nodes.Condition(
nodes.Equality(switch[0], value),
nodes.Cancel([switch[0]], node),
))
# tal:repeat
try:
clause = ns[TAL, 'repeat']
except KeyError:
REPEAT = skip
else:
defines = tal.parse_defines(clause)
assert len(defines) == 1
context, names, expr = defines[0]
expression = nodes.Value(expr)
if start['namespace'] == TAL:
self._last = None
self._whitespace = whitespace.lstrip('\n')
whitespace = ""
REPEAT = partial(
nodes.Repeat,
names,
expression,
context == "local",
whitespace
)
# tal:condition
try:
clause = ns[TAL, 'condition']
except KeyError:
CONDITION = skip
else:
expression = nodes.Value(clause)
CONDITION = partial(nodes.Condition, expression)
# tal:switch
if switch is None:
SWITCH = skip
else:
SWITCH = partial(nodes.Cache, list(switch))
# i18n:domain
try:
clause = ns[I18N, 'domain']
except KeyError:
DOMAIN = skip
else:
DOMAIN = partial(nodes.Domain, clause)
# i18n:name
try:
clause = ns[I18N, 'name']
except KeyError:
NAME = skip
else:
if not clause.strip():
NAME = skip
else:
NAME = partial(nodes.Name, clause)
# The "slot" node next is the first node level that can serve
# as a macro slot
slot = wrap(
inner,
DEFINE_SLOT,
DEFINE,
CASE,
CONDITION,
REPEAT,
SWITCH,
DOMAIN,
)
# metal:fill-slot
try:
clause = ns[METAL, 'fill-slot']
except KeyError:
pass
else:
if not clause.strip():
raise LanguageError(
"Must provide a non-trivial string for metal:fill-slot.",
clause
)
index = -(1 + int(bool(use_macro or extend_macro)))
try:
slots = self._use_macro[index]
except IndexError:
raise LanguageError(
"Cannot use metal:fill-slot without metal:use-macro.",
clause
)
slots = self._use_macro[index]
slots.append(nodes.FillSlot(clause, slot))
# metal:define-macro
try:
clause = ns[METAL, 'define-macro']
except KeyError:
pass
else:
self._macros[clause] = slot
slot = nodes.UseInternalMacro(clause)
slot = wrap(
slot,
NAME
)
# tal:on-error
try:
clause = ns[TAL, 'on-error']
except KeyError:
ON_ERROR = skip
else:
key, value = tal.parse_substitution(clause)
translate = True if ns.get((I18N, 'translate')) == '' else False
fallback = self._make_content_node(value, None, key, translate)
if omit is False and start['namespace'] not in self.DROP_NS:
start_tag = copy(start_tag)
start_tag.attributes = nodes.Sequence(
start_tag.attributes.extract(
lambda attribute:
isinstance(attribute, nodes.Attribute) and
isinstance(attribute.expression, ast.Str)
)
)
if end_tag is None:
# Make sure start-tag has opening suffix. We don't
# allow self-closing element here.
start_tag.suffix = ">"
# Explicitly set end-tag.
end_tag = nodes.End(start_tag.name, '', '</', '>',)
fallback = nodes.Element(
start_tag,
end_tag,
fallback,
)
ON_ERROR = partial(nodes.OnError, fallback, 'error')
clause = ns.get((META, 'interpolation'))
if clause in ('false', 'off'):
INTERPOLATION = False
elif clause in ('true', 'on'):
INTERPOLATION = True
elif clause is None:
INTERPOLATION = self._interpolation[-1]
else:
raise LanguageError("Bad interpolation setting.", clause)
self._interpolation.append(INTERPOLATION)
# Visit content body
for child in children:
body.append(self.visit(*child))
self._switches.pop()
self._interpolation.pop()
if use_macro:
self._use_macro.pop()
return wrap(
slot,
ON_ERROR
)
def prev_visit_element(self, start, end, children):
ns = start['ns_attrs']
for (prefix, attr), encoded in tuple(ns.items()):
if prefix == TAL:
ns[prefix, attr] = decode_htmlentities(encoded)
# Validate namespace attributes
validate_attributes(ns, TAL, tal.WHITELIST)
validate_attributes(ns, I18N, i18n.WHITELIST)
# Check attributes for language errors
self._check_attributes(start['namespace'], ns)
# Remember whitespace for item repetition
if self._last is not None:
self._whitespace = "\n" + " " * len(self._last.rsplit('\n', 1)[-1])
# Set element-local whitespace
whitespace = self._whitespace
# Set up switch
try:
clause = ns[TAL, 'switch']
except KeyError:
switch = None
else:
switch = nodes.Value(clause)
self._switches.append(switch)
body = []
content = nodes.Sequence(body)
# tal:content
try:
clause = ns[TAL, 'content']
except KeyError:
pass
else:
key, value = tal.parse_substitution(clause)
xlate = True if ns.get((I18N, 'translate')) == '' else False
content = self._make_content_node(value, content, key, xlate)
if end is None:
# Make sure start-tag has opening suffix.
start['suffix'] = ">"
# Explicitly set end-tag.
end = {
'prefix': '</',
'name': start['name'],
'space': '',
'suffix': '>'
}
# i18n:translate
try:
clause = ns[I18N, 'translate']
except KeyError:
pass
else:
dynamic = ns.get((TAL, 'content')) or ns.get((TAL, 'replace'))
if not dynamic:
content = nodes.Translate(clause, content)
# tal:attributes
try:
clause = ns[TAL, 'attributes']
except KeyError:
TAL_ATTRIBUTES = {}
else:
TAL_ATTRIBUTES = tal.parse_attributes(clause)
# i18n:attributes
try:
clause = ns[I18N, 'attributes']
except KeyError:
I18N_ATTRIBUTES = {}
else:
I18N_ATTRIBUTES = i18n.parse_attributes(clause)
# Prepare attributes from TAL language
prepared = tal.prepare_attributes(start['attrs'], TAL_ATTRIBUTES,
I18N_ATTRIBUTES, ns, self.DROP_NS)
# Create attribute nodes
STATIC_ATTRIBUTES = self._create_static_attributes(prepared)
ATTRIBUTES = self._create_attributes_nodes(prepared, I18N_ATTRIBUTES)
# Start- and end nodes
start_tag = nodes.Start(start['name'],
self._maybe_trim(start['prefix']),
self._maybe_trim(start['suffix']), ATTRIBUTES)
stag = start_tag
end_tag = nodes.End(
end['name'],
end['space'],
self._maybe_trim(end['prefix']),
self._maybe_trim(end['suffix']),
) if end is not None else None
# tal:omit-tag
try:
clause = ns[TAL, 'omit-tag']
except KeyError:
omit = False
else:
clause = clause.strip()
if clause == "":
omit = True
else:
expression = nodes.Negate(nodes.Value(clause))
omit = expression
# Wrap start- and end-tags in condition
start_tag = nodes.Condition(expression, start_tag)
if end_tag is not None:
end_tag = nodes.Condition(expression, end_tag)
if omit is True or start['namespace'] in self.DROP_NS:
inner = content
else:
inner = nodes.Element(
start_tag,
end_tag,
content,
)
# Assign static attributes dictionary to "attrs" value
inner = nodes.Define(
[nodes.Alias(["attrs"], STATIC_ATTRIBUTES)],
inner,
)
if omit is not False:
inner = nodes.Cache([omit], inner)
# tal:replace
try:
clause = ns[TAL, 'replace']
except KeyError:
pass
else:
key, value = tal.parse_substitution(clause)
xlate = True if ns.get((I18N, 'translate')) == '' else False
inner = self._make_content_node(value, inner, key, xlate)
# tal:define
try:
clause = ns[TAL, 'define']
except KeyError:
DEFINE = skip
else:
defines = tal.parse_defines(clause)
if defines is None:
raise ParseError("Invalid define syntax.", clause)
DEFINE = partial(
nodes.Define,
[
nodes.Assignment(names, nodes.Value(expr), context
== "local")
for (context, names, expr) in defines
],
)
# tal:case
try:
clause = ns[TAL, 'case']
except KeyError:
CASE = skip
else:
value = nodes.Value(clause)
for switch in reversed(self._switches):
if switch is not None:
break
else:
raise LanguageError("Must define switch on a parent element.",
clause)
CASE = lambda node: nodes.Define([
nodes.Assignment(["default"], switch, True)
], nodes.Condition(
nodes.Equality(switch, value),
node,
))
# tal:repeat
try:
clause = ns[TAL, 'repeat']
except KeyError:
REPEAT = skip
else:
defines = tal.parse_defines(clause)
assert len(defines) == 1
context, names, expr = defines[0]
expression = nodes.Value(expr)
REPEAT = partial(nodes.Repeat, names, expression,
context == "local", whitespace)
# tal:condition
try:
clause = ns[TAL, 'condition']
except KeyError:
CONDITION = skip
else:
expression = nodes.Value(clause)
CONDITION = partial(nodes.Condition, expression)
# tal:switch
if switch is None:
SWITCH = skip
else:
SWITCH = partial(nodes.Cache, [switch])
# i18n:domain
try:
clause = ns[I18N, 'domain']
except KeyError:
DOMAIN = skip
else:
DOMAIN = partial(nodes.Domain, clause)
# i18n:name
try:
clause = ns[I18N, 'name']
except KeyError:
NAME = skip
else:
NAME = partial(nodes.Name, clause)
# The "slot" node next is the first node level that can serve
# as a macro slot
slot = wrap(
inner,
DEFINE,
CASE,
CONDITION,
REPEAT,
SWITCH,
DOMAIN,
)
slot = wrap(slot, NAME)
# tal:on-error
try:
clause = ns[TAL, 'on-error']
except KeyError:
ON_ERROR = skip
else:
key, value = tal.parse_substitution(clause)
translate = True if ns.get((I18N, 'translate')) == '' else False
fallback = self._make_content_node(value, None, key, translate)
if omit is False and start['namespace'] not in self.DROP_NS:
fallback = nodes.Element(
start_tag,
end_tag,
fallback,
)
ON_ERROR = partial(nodes.OnError, fallback, 'error')
clause = ns.get((META, 'interpolation'))
if clause in ('false', 'off'):
INTERPOLATION = False
elif clause in ('true', 'on'):
INTERPOLATION = True
elif clause is None:
INTERPOLATION = self._interpolation[-1]
else:
raise LanguageError("Bad interpolation setting.", clause)
self._interpolation.append(INTERPOLATION)
# Visit content body
for child in children:
body.append(self.visit(*child))
self._switches.pop()
self._interpolation.pop()
slot = wrap(slot, ON_ERROR)
stag.replayable = False
if self.binds:
try:
bind_replay_clause = ns[(PRAMTAL, "bind-replay")]
splits = bind_replay_clause.split(" ")
if len(splits) != 2:
raise LanguageError("Invalid bind replay.",
bind_replay_clause)
events = splits[1].split(";")
slot = BindReplay(splits[0], events, slot)
stag.replayable = True
except KeyError:
pass
if self.binds:
try:
bind_clause = ns[(PRAMTAL, "bind-change")]
bind_splits = bind_clause.strip().split(" ")
if len(bind_splits) > 3:
raise LanguageError("Invalid bind syntax.", bind_clause)
if not "#" in bind_splits[0]:
raise LanguageError("No bind model target specified.",
bind_clause)
first_split = bind_splits[0][1:]
if "." in first_split:
bind_model, bind_ons = first_split.split(".", 1)
bind_ons = bind_ons.strip().split(".")
else:
bind_model = first_split
bind_ons = []
bind_attrs = []
if len(bind_splits) > 1:
bind_attrs = bind_splits[1].split(";")
stag.replayable = True
slot = BindChange(bind_model, bind_ons, bind_attrs, slot)
except KeyError:
pass
stag.repeatable = False
if self.binds:
try:
bind_repeat_clause = ns[(PRAMTAL, "bind-repeat")]
except KeyError:
pass
else:
splits = bind_repeat_clause.split(" ")
if len(splits) != 2:
raise LanguageError("Invalid define model.",
bind_repeat_clause)
if not splits[0].startswith("#"):
raise LanguageError("need # in alias.", bind_repeat_clause)
slot = BindRepeat(splits[0][1:], splits[1], slot)
stag.repeatable = True
try:
define_model_clause = ns[(PRAMTAL, "define-model")]
except KeyError:
pass
else:
pairs = define_model_clause.split(";")
models = []
for pair in pairs:
pair = pair.strip()
splits = pair.split(" ")
if len(splits) != 2:
raise LanguageError("Invalid define model.", pair)
if not splits[0].startswith("#"):
raise LanguageError("need # in alias.", pair)
models.append((splits[0][1:], splits[1]))
slot = DefineModel(models, slot)
return slot