mirror of
https://gitee.com/openharmony/third_party_pyyaml
synced 2024-11-27 12:20:38 +00:00
228 lines
8.8 KiB
Python
228 lines
8.8 KiB
Python
|
|
__all__ = ['BaseResolver', 'Resolver']
|
|
|
|
from .error import *
|
|
from .nodes import *
|
|
|
|
import re
|
|
|
|
class ResolverError(YAMLError):
|
|
pass
|
|
|
|
class BaseResolver:
|
|
|
|
DEFAULT_SCALAR_TAG = 'tag:yaml.org,2002:str'
|
|
DEFAULT_SEQUENCE_TAG = 'tag:yaml.org,2002:seq'
|
|
DEFAULT_MAPPING_TAG = 'tag:yaml.org,2002:map'
|
|
|
|
yaml_implicit_resolvers = {}
|
|
yaml_path_resolvers = {}
|
|
|
|
def __init__(self):
|
|
self.resolver_exact_paths = []
|
|
self.resolver_prefix_paths = []
|
|
|
|
@classmethod
|
|
def add_implicit_resolver(cls, tag, regexp, first):
|
|
if not 'yaml_implicit_resolvers' in cls.__dict__:
|
|
implicit_resolvers = {}
|
|
for key in cls.yaml_implicit_resolvers:
|
|
implicit_resolvers[key] = cls.yaml_implicit_resolvers[key][:]
|
|
cls.yaml_implicit_resolvers = implicit_resolvers
|
|
if first is None:
|
|
first = [None]
|
|
for ch in first:
|
|
cls.yaml_implicit_resolvers.setdefault(ch, []).append((tag, regexp))
|
|
|
|
@classmethod
|
|
def add_path_resolver(cls, tag, path, kind=None):
|
|
# Note: `add_path_resolver` is experimental. The API could be changed.
|
|
# `new_path` is a pattern that is matched against the path from the
|
|
# root to the node that is being considered. `node_path` elements are
|
|
# tuples `(node_check, index_check)`. `node_check` is a node class:
|
|
# `ScalarNode`, `SequenceNode`, `MappingNode` or `None`. `None`
|
|
# matches any kind of a node. `index_check` could be `None`, a boolean
|
|
# value, a string value, or a number. `None` and `False` match against
|
|
# any _value_ of sequence and mapping nodes. `True` matches against
|
|
# any _key_ of a mapping node. A string `index_check` matches against
|
|
# a mapping value that corresponds to a scalar key which content is
|
|
# equal to the `index_check` value. An integer `index_check` matches
|
|
# against a sequence value with the index equal to `index_check`.
|
|
if not 'yaml_path_resolvers' in cls.__dict__:
|
|
cls.yaml_path_resolvers = cls.yaml_path_resolvers.copy()
|
|
new_path = []
|
|
for element in path:
|
|
if isinstance(element, (list, tuple)):
|
|
if len(element) == 2:
|
|
node_check, index_check = element
|
|
elif len(element) == 1:
|
|
node_check = element[0]
|
|
index_check = True
|
|
else:
|
|
raise ResolverError("Invalid path element: %s" % element)
|
|
else:
|
|
node_check = None
|
|
index_check = element
|
|
if node_check is str:
|
|
node_check = ScalarNode
|
|
elif node_check is list:
|
|
node_check = SequenceNode
|
|
elif node_check is dict:
|
|
node_check = MappingNode
|
|
elif node_check not in [ScalarNode, SequenceNode, MappingNode] \
|
|
and not isinstance(node_check, str) \
|
|
and node_check is not None:
|
|
raise ResolverError("Invalid node checker: %s" % node_check)
|
|
if not isinstance(index_check, (str, int)) \
|
|
and index_check is not None:
|
|
raise ResolverError("Invalid index checker: %s" % index_check)
|
|
new_path.append((node_check, index_check))
|
|
if kind is str:
|
|
kind = ScalarNode
|
|
elif kind is list:
|
|
kind = SequenceNode
|
|
elif kind is dict:
|
|
kind = MappingNode
|
|
elif kind not in [ScalarNode, SequenceNode, MappingNode] \
|
|
and kind is not None:
|
|
raise ResolverError("Invalid node kind: %s" % kind)
|
|
cls.yaml_path_resolvers[tuple(new_path), kind] = tag
|
|
|
|
def descend_resolver(self, current_node, current_index):
|
|
if not self.yaml_path_resolvers:
|
|
return
|
|
exact_paths = {}
|
|
prefix_paths = []
|
|
if current_node:
|
|
depth = len(self.resolver_prefix_paths)
|
|
for path, kind in self.resolver_prefix_paths[-1]:
|
|
if self.check_resolver_prefix(depth, path, kind,
|
|
current_node, current_index):
|
|
if len(path) > depth:
|
|
prefix_paths.append((path, kind))
|
|
else:
|
|
exact_paths[kind] = self.yaml_path_resolvers[path, kind]
|
|
else:
|
|
for path, kind in self.yaml_path_resolvers:
|
|
if not path:
|
|
exact_paths[kind] = self.yaml_path_resolvers[path, kind]
|
|
else:
|
|
prefix_paths.append((path, kind))
|
|
self.resolver_exact_paths.append(exact_paths)
|
|
self.resolver_prefix_paths.append(prefix_paths)
|
|
|
|
def ascend_resolver(self):
|
|
if not self.yaml_path_resolvers:
|
|
return
|
|
self.resolver_exact_paths.pop()
|
|
self.resolver_prefix_paths.pop()
|
|
|
|
def check_resolver_prefix(self, depth, path, kind,
|
|
current_node, current_index):
|
|
node_check, index_check = path[depth-1]
|
|
if isinstance(node_check, str):
|
|
if current_node.tag != node_check:
|
|
return
|
|
elif node_check is not None:
|
|
if not isinstance(current_node, node_check):
|
|
return
|
|
if index_check is True and current_index is not None:
|
|
return
|
|
if (index_check is False or index_check is None) \
|
|
and current_index is None:
|
|
return
|
|
if isinstance(index_check, str):
|
|
if not (isinstance(current_index, ScalarNode)
|
|
and index_check == current_index.value):
|
|
return
|
|
elif isinstance(index_check, int) and not isinstance(index_check, bool):
|
|
if index_check != current_index:
|
|
return
|
|
return True
|
|
|
|
def resolve(self, kind, value, implicit):
|
|
if kind is ScalarNode and implicit[0]:
|
|
if value == '':
|
|
resolvers = self.yaml_implicit_resolvers.get('', [])
|
|
else:
|
|
resolvers = self.yaml_implicit_resolvers.get(value[0], [])
|
|
resolvers += self.yaml_implicit_resolvers.get(None, [])
|
|
for tag, regexp in resolvers:
|
|
if regexp.match(value):
|
|
return tag
|
|
implicit = implicit[1]
|
|
if self.yaml_path_resolvers:
|
|
exact_paths = self.resolver_exact_paths[-1]
|
|
if kind in exact_paths:
|
|
return exact_paths[kind]
|
|
if None in exact_paths:
|
|
return exact_paths[None]
|
|
if kind is ScalarNode:
|
|
return self.DEFAULT_SCALAR_TAG
|
|
elif kind is SequenceNode:
|
|
return self.DEFAULT_SEQUENCE_TAG
|
|
elif kind is MappingNode:
|
|
return self.DEFAULT_MAPPING_TAG
|
|
|
|
class Resolver(BaseResolver):
|
|
pass
|
|
|
|
Resolver.add_implicit_resolver(
|
|
'tag:yaml.org,2002:bool',
|
|
re.compile(r'''^(?:yes|Yes|YES|no|No|NO
|
|
|true|True|TRUE|false|False|FALSE
|
|
|on|On|ON|off|Off|OFF)$''', re.X),
|
|
list('yYnNtTfFoO'))
|
|
|
|
Resolver.add_implicit_resolver(
|
|
'tag:yaml.org,2002:float',
|
|
re.compile(r'''^(?:[-+]?(?:[0-9][0-9_]*)\.[0-9_]*(?:[eE][-+][0-9]+)?
|
|
|\.[0-9_]+(?:[eE][-+][0-9]+)?
|
|
|[-+]?[0-9][0-9_]*(?::[0-5]?[0-9])+\.[0-9_]*
|
|
|[-+]?\.(?:inf|Inf|INF)
|
|
|\.(?:nan|NaN|NAN))$''', re.X),
|
|
list('-+0123456789.'))
|
|
|
|
Resolver.add_implicit_resolver(
|
|
'tag:yaml.org,2002:int',
|
|
re.compile(r'''^(?:[-+]?0b[0-1_]+
|
|
|[-+]?0[0-7_]+
|
|
|[-+]?(?:0|[1-9][0-9_]*)
|
|
|[-+]?0x[0-9a-fA-F_]+
|
|
|[-+]?[1-9][0-9_]*(?::[0-5]?[0-9])+)$''', re.X),
|
|
list('-+0123456789'))
|
|
|
|
Resolver.add_implicit_resolver(
|
|
'tag:yaml.org,2002:merge',
|
|
re.compile(r'^(?:<<)$'),
|
|
['<'])
|
|
|
|
Resolver.add_implicit_resolver(
|
|
'tag:yaml.org,2002:null',
|
|
re.compile(r'''^(?: ~
|
|
|null|Null|NULL
|
|
| )$''', re.X),
|
|
['~', 'n', 'N', ''])
|
|
|
|
Resolver.add_implicit_resolver(
|
|
'tag:yaml.org,2002:timestamp',
|
|
re.compile(r'''^(?:[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]
|
|
|[0-9][0-9][0-9][0-9] -[0-9][0-9]? -[0-9][0-9]?
|
|
(?:[Tt]|[ \t]+)[0-9][0-9]?
|
|
:[0-9][0-9] :[0-9][0-9] (?:\.[0-9]*)?
|
|
(?:[ \t]*(?:Z|[-+][0-9][0-9]?(?::[0-9][0-9])?))?)$''', re.X),
|
|
list('0123456789'))
|
|
|
|
Resolver.add_implicit_resolver(
|
|
'tag:yaml.org,2002:value',
|
|
re.compile(r'^(?:=)$'),
|
|
['='])
|
|
|
|
# The following resolver is only for documentation purposes. It cannot work
|
|
# because plain scalars cannot start with '!', '&', or '*'.
|
|
Resolver.add_implicit_resolver(
|
|
'tag:yaml.org,2002:yaml',
|
|
re.compile(r'^(?:!|&|\*)$'),
|
|
list('!&*'))
|
|
|