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baseparser.py
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baseparser.py
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import sys
import re
import copy
from collections import OrderedDict, namedtuple
from yaml_patch import ProcessLoader, Mark
import yaml
class NodeError(yaml.MarkedYAMLError):
def __init__(self, problem, node, note=None):
super().__init__(None, None, problem, node.start_mark, note=note)
class Node:
def set_span(self, start_mark, end_mark):
self._start_mark = start_mark
self._end_mark = end_mark
@property
def start_mark(self): return getattr(self, '_start_mark', None)
@property
def end_mark(self): return getattr(self, '_end_mark', None)
class Null:
def __init__(self, value):
self.value = value
def __repr__(self):
return 'null'
class Bool:
def __init__(self, value):
self.value = bool(value)
def __bool__(self):
return self.value
def __repr__(self):
return 'true' if self else 'false'
class NullNode(Null, Node): pass
class BoolNode(Bool, Node): pass
class IntNode(int, Node): pass
class StrNode(str, Node): pass
class FloatNode(float, Node): pass
class ListNode(list, Node): pass
class DictNode(OrderedDict, Node): pass
from yaml.representer import Representer
from yaml.constructor import Constructor
yaml_representer = Representer()
yaml_constructor = Constructor()
def yaml_to_node(yaml_obj):
if isinstance(yaml_obj, yaml.MappingNode):
v = [(yaml_to_node(k), yaml_to_node(v)) for k, v in yaml_obj.value]
node = DictNode(v)
elif isinstance(yaml_obj, yaml.SequenceNode):
v = [yaml_to_node(v) for v in yaml_obj.value]
node = ListNode(v)
elif isinstance(yaml_obj, yaml.ScalarNode):
# 'tag:yaml.org,2002:bool'
type = yaml_obj.tag.split(':')[2]
type = type[0].upper() + type[1:] + 'Node'
v = yaml_obj.value
node = globals()[type](v)
node.set_span(yaml_obj.start_mark, yaml_obj.end_mark)
return node
def offset_mark(mark, offset):
mark = copy.copy(mark)
mark.column += offset
mark.pointer += offset
return mark
class Builder:
def __init__(self, k_pattern, k_belong, creator_type, **kwargs):
self.k_pattern = k_pattern
self.k_belong = k_belong
self.creator_type = creator_type
self.behaviors = kwargs.get('behaviors', None)
self.minor_spliters = kwargs.get('minor_spliters', None)
self.extra_attribs = kwargs.get('extra_attribs', OrderedDict())
self.locale_builder = kwargs.get('locale_builder', None)
if self.locale_builder:
assert self.locale_builder.parent is None
self.locale_builder.set_parent(self)
self.parent = None
def set_parent(self, parent):
self.parent = parent
def get_locale_builder(self):
p = self
while(p):
if p.locale_builder:
return p
p = p.parent
@classmethod
def slice_text(cls, text, begin, end):
sliced = StrNode(text[begin:end])
sm = offset_mark(text.start_mark, begin)
em = offset_mark(text.start_mark, end)
sliced.set_span(sm, em)
return sliced
def key_match(self, key):
assert isinstance(key, StrNode)
if not key.startswith(self.k_pattern):
return None, []
def findpos(string):
poses = [(i, string.find(sub)) for i, sub in enumerate(self.minor_spliters)]
poses = [pos for pos in poses if pos[1] != -1]
if not poses:
return -1, None
idx, pos = min(poses, key=lambda x: x[1])
return pos, self.minor_spliters[idx]
headpart_begin = len(self.k_pattern)
entire_end = len(key)
breaks = []
if self.minor_spliters:
target = key[headpart_begin:]
pos, spliter = findpos(target)
while(pos != -1):
breaks.append(pos + (breaks[-1] if breaks else 0))
target = key[breaks[-1]+len(spliter)+headpart_begin:]
pos, next_spliter = findpos(target)
if pos != -1:
pos += len(spliter)
spliter = next_spliter
breaks = [p + headpart_begin for p in breaks]
if breaks:
headpart = self.slice_text(key, headpart_begin, breaks[0])
tailparts = [self.slice_text(key, begin, end) for begin, end in zip(breaks, breaks[1:] + [entire_end]) ]
else:
headpart = self.slice_text(key, headpart_begin, entire_end)
tailparts = []
return headpart, tailparts
def _from_kvlist(self, maker, root, key, values, parent_kwargs):
headpart, tailparts = self.key_match(key)
if headpart is None:
return None
init_kwargs = DictNode(copy.deepcopy(self.extra_attribs))
init_kwargs.set_span(key.start_mark, key.end_mark)
_parts = [headpart] + tailparts
parts = _parts[:]
behaviors = list(self.behaviors or [])
context = {'creator_type':self.creator_type}
def do_beh(beh):
if not parts:
raise NodeError('need more part', _parts[-1])
return beh.do(maker, root, self, parts.pop(0), init_kwargs, context)
beh = behaviors.pop(0) if behaviors else None
while beh and not beh.star:
if not do_beh(beh):
return False
beh = behaviors.pop(0) if behaviors else None
while beh and parts:
do_beh(beh)
obj = self.common_build(maker, root, context['creator_type'], key, values, init_kwargs)
parent_kwargs.setdefault(self.k_belong, []).append(obj)
return True
def from_kvlist(self, maker, root, key, values, parent_kwargs):
try:
return self._from_kvlist(maker, root, key, values, parent_kwargs)
except Exception as e:
exc_class, exc, tb = sys.exc_info()
newexc = NodeError(str(e), key)
raise newexc.with_traceback(tb) from None
def common_build(self, maker, root, creator_type, name, kwlist, init_kwargs=None):
#print(kwlist)
assert isinstance(kwlist, ListNode)
args = []
build_kwargs = DictNode()
build_kwargs.set_span(name.start_mark, name.end_mark)
build_kwargs.update(copy.deepcopy(creator_type.init_kwargs))
build_kwargs.update(init_kwargs or {})
kwlist_kwargs = DictNode()
def from_kvlist(k, v):
if self.get_locale_builder():
return self.get_locale_builder().locale_builder.from_kvlist(maker, root, k, v, build_kwargs)
return False
for v in kwlist:
if isinstance(v, DictNode):
objk, objv = list(v.items())[0]
trans_objk = maker.translate_table.get(objk, None)
if trans_objk:
trans_objk = StrNode(trans_objk)
trans_objk.set_span(objk.start_mark, objk.end_mark)
objk = trans_objk
# objk, objv is constructor
if isinstance(objv, ListNode) and from_kvlist(objk, objv):
continue
# objk, objv is attributes
kwlist_kwargs[objk] = objv
else:
if not isinstance(v, (ListNode, DictNode)):
if from_kvlist(v, ListNode()):
# element v is constructor
continue
# element v is fixed-position attributes, maybe is array
args.append(v)
build_kwargs.update(kwlist_kwargs)
# check args and kwargs of creation
extra = list(creator_type.fields)
#print(extra, list(build_kwargs.keys()))
#print(args)
for attr in build_kwargs.keys():
if attr not in extra:
if not(extra and creator_type.NO_CHECK in extra):
if attr in kwlist_kwargs:
raise NodeError('多餘的條目: {0}'.format(attr), attr)
else:
print(creator_type.typename, creator_type.fields, build_kwargs)
raise NodeError('多餘的預設條目: {0}'.format(attr), kwlist)
else:
extra.remove(attr)
for arg in args:
if len(extra) == 0:
raise NodeError('多餘的條目', arg)
if extra[0] != creator_type.NO_CHECK:
extra.pop(0)
if len(extra) > 0:
if extra[0] != creator_type.NO_CHECK:
raise NodeError('還有未指定的屬性: {}'.format(extra[0]), name)
pack = creator_type.pack(maker, root, args, build_kwargs)
return pack
#obj = creator_type.creator(maker, *args, **build_kwargs)
#return obj
class MultiBuilder(Builder):
def __init__(self, builders):
self.builders = []
self.locale_builder = self
for builder in builders:
self.add_builder(builder)
self.parent = None
def add_builder(self, builders):
if not isinstance(builders, list):
builders = [builders]
for builder in builders:
if builder.parent is not None:
builder = copy.copy(builder)
builder.set_parent(self)
self.builders.append(builder)
def from_kvlist(self, maker, root, key, values, parent_kwargs):
for builder in self.builders:
obj = builder.from_kvlist(maker, root, key, values, parent_kwargs)
if obj:
return True
return False
class Behavior:
def __init__(self, strict=True, star=False):
self.strict = strict
self.star = star
@classmethod
def text_match(cls, text, subclasses):
assert isinstance(text, StrNode)
for _regex, match_cls in subclasses.items():
regex = re.compile(_regex)
m = regex.match(text)
if m:
kwargs_list = DictNode()
kwargs_list.set_span(text.start_mark, text.end_mark)
for k, v in m.groupdict().items():
start, end = m.span(regex.groupindex[k])
sm, em = offset_mark(text.start_mark, start), offset_mark(text.start_mark, end)
k, v = StrNode(k), StrNode(v)
k.set_span(sm, em)
v.set_span(sm, em)
kwargs_list[k] = v
return match_cls, kwargs_list
return None, None
# prop + to_child
class AsNameBehavior(Behavior):
def do(self, maker, root, builder, text, init_kwargs, context):
init_kwargs['name'] = text
return True
# instance + add_parent
class AsTypeBehavior(Behavior):
def __init__(self, subclasses, **kwargs):
super().__init__(**kwargs)
self.subclasses = subclasses
def do(self, maker, root, builder, text, init_kwargs, context):
creator_type, kwlist = self.__class__.text_match(text, self.subclasses)
if creator_type:
init_kwargs.update(kwlist)
context['creator_type'] = creator_type
return creator_type
elif self.strict:
raise NodeError('找不到可符合的類別', text)
# instance + as_child
class KSubBehavior(Behavior):
def __init__(self, subclasses, ksub_belong, **kwargs):
super().__init__(**kwargs)
self.subclasses = subclasses
self.ksub_belong = ksub_belong
def do(self, maker, root, builder, text, init_kwargs, context):
creator_type, kwlist = self.__class__.text_match(text, self.subclasses)
if creator_type:
sub = builder.common_build(maker, root, creator_type, text, ListNode(), kwlist)
init_kwargs.setdefault(self.ksub_belong, []).append(sub)
return True
elif self.strict:
raise NodeError('找不到可符合的類別', text)
return False
# instance + as_child
class BuildBehavior(Behavior):
def __init__(self, builder, **kwargs):
super().__init__(**kwargs)
self.builder = builder
def do(self, maker, root, builder, text, init_kwargs, context):
if self.builder.from_kvlist(maker, root, text, ListNode(), init_kwargs):
return True
elif self.strict:
raise NodeError('找不到可符合的類別', text)
return False
class PropertyBahavior(Behavior):
def __init__(self, subclasses, **kwargs):
super().__init__(**kwargs)
self.subclasses = subclasses
def do(self, maker, root, builder, text, init_kwargs, context):
creator_type, kwlist = self.__class__.text_match(text, self.subclasses)
if not creator_type:
raise NodeError('找不到可符合的類別', text)
init_kwargs.update(kwlist)
return True
CreatorPack = namedtuple('CreatorPack', 'creator_type maker root args kwargs')
def unique_merge(iter1, iter2):
merged = list(iter1)
for item in iter2:
if item not in merged:
merged.append(item)
return merged
class CreatorType:
NO_CHECK = object()
def __init__(self, typename=None, fields=None, init_kwargs=None):
self.typename = typename
self.fields = fields or []
self.fields = list(self.fields) if not isinstance(self.fields, str) else fields.split(' ')
for i in range(len(self.fields)):
if self.fields[i] == 'NO_CHECK':
self.fields[i] = self.NO_CHECK
self.init_kwargs = init_kwargs or []
if isinstance(self.init_kwargs, list):
self.init_kwargs = OrderedDict(self.init_kwargs)
self.fields = unique_merge(self.fields, self.init_kwargs.keys())
def inherit(self, base):
fields = unique_merge(base.fields, self.fields)
init_kwargs = copy.deepcopy(base.init_kwargs)
init_kwargs.update(self.init_kwargs)
return self.__class__(self.typename, fields, init_kwargs)
def pack(self, maker, root, args, kwargs):
return CreatorPack(self, maker, root, args, kwargs)
def resolve_children(self, target, parent=None):
if isinstance(target, list):
node = ListNode(self.resolve_children(v, parent) for v in target)
if hasattr(target, 'start_mark'):
node.set_span(target.start_mark, target.end_mark)
return node
if isinstance(target, dict):
node = DictNode((k, self.resolve_children(v, parent)) for k, v in target.items())
if hasattr(target, 'start_mark'):
node.set_span(target.start_mark, target.end_mark)
return node
if isinstance(target, CreatorPack):
return target.creator_type.resolve(target, parent)
return target
def resolve(self, pack, parent=None):
obj = DictNode(pack.kwargs)
obj.set_span(pack.kwargs.start_mark, pack.kwargs.end_mark)
for key, arg in zip(self.fields, pack.args):
obj[key] = arg
for k, v in obj.items():
obj[k] = self.resolve_children(v, self)
return obj
class SimpleDictCreatorType(CreatorType):
def resolve(self, pack, parent=None):
assert len(pack.args) == 0
return dict(pack.kwargs)
class SimpleListCreatorType(CreatorType):
def resolve(self, pack, parent=None):
assert len(pack.kwrags) == 0
return list(pack.args)
class Maker:
def __init__(self):
self.builder = MultiBuilder([])
self.translate_table = {}
def from_file(self, filename):
data = yaml.compose(filename, ProcessLoader)
data = yaml_to_node(data)
root = {}
root['filename'] = filename
pack = self.builder.common_build(self, root, self.Root, StrNode(filename), data)
return pack
def from_main_file(self, filename):
import traceback
try:
return self.from_file(filename)
except:
traceback.print_exc()
return None