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keyword.py
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keyword.py
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'''pyleri.Keyword Class.
Try matching a given keyword string. The keyword should match
Grammer.RE_KEYWORDS otherwise the keyword will not be found. It's possible
however to overwrite the default RE_KEYWORDS in you own Grammar class.
Example:
class MyGrammar(Grammar):
# needed because the default ^\w+ will not match keyword: my-keyword
RE_KEYWORDS = re.compile('^[\w-]+')
my_keyword = Keyword('my-keyword')
...
:copyright: 2015, Jeroen van der Heijden (Transceptor Technology)
'''
from .elements import NamedElement, c_export, go_export, java_export
class Keyword(NamedElement):
__slots__ = ('_keyword', '_ign_case')
def __init__(self, keyword, ign_case=False):
if not isinstance(keyword, str):
raise TypeError(
'Keyword(): first positional argument must be a string value')
self._keyword = keyword
self._ign_case = bool(ign_case)
def __repr__(self):
return self._keyword
def _get_node_result(self, root, tree, rule, s, node):
try:
re_match = root._cached_kw_match[node.start]
except KeyError:
re_match = \
root._cached_kw_match[node.start] = \
root.RE_KEYWORDS.match(s)
is_valid = \
re_match and \
(re_match.group(0) == self._keyword or
(self._ign_case and
re_match.group(0).lower() == self._keyword.lower()))
if is_valid:
root._append_tree(tree, node, node.start + len(self._keyword))
else:
root._expecting.update(self, node.start)
return is_valid, node.end or node.start
def _run_export_js(self, js_indent, indent, classes, cname):
return 'Keyword(\'{}\'{})'.format(
self._keyword,
', true' if self._ign_case else '')
def _run_export_py(self, py_indent, indent, classes):
return 'Keyword(\'{}\'{})'.format(
self._keyword,
', True' if self._ign_case else '')
@c_export
def _run_export_c(self, c_indent, indent, enums, gid):
return 'cleri_keyword({}, "{}", {})'.format(
gid,
self._keyword,
'CLERI_CASE_INSENSITIVE'
if self._ign_case else 'CLERI_CASE_SENSITIVE')
@go_export
def _run_export_go(self, go_indent, indent, enums, gid):
return 'goleri.NewKeyword({}, "{}", {})'.format(
gid,
self._keyword,
'true' if self._ign_case else 'false')
@java_export
def _run_export_java(self, c_indent, indent, enums, classes, gid):
return 'new Keyword({}"{}", {})'.format(
'' if gid is None else 'Ids.{}, '.format(gid),
self._keyword,
'true' if self._ign_case else 'false')