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composer.py	4.77 MB	View DL Edit
constructor.py	27.97 MB	View DL Edit
cyaml.py	3.76 MB	View DL Edit
dumper.py	2.77 MB	View DL Edit
emitter.py	42 MB	View DL Edit
error.py	2.47 MB	View DL Edit
events.py	2.39 MB	View DL Edit
loader.py	2.01 MB	View DL Edit
nodes.py	1.41 MB	View DL Edit
parser.py	24.9 MB	View DL Edit
reader.py	6.63 MB	View DL Edit
representer.py	13.85 MB	View DL Edit
resolver.py	8.79 MB	View DL Edit
scanner.py	50.08 MB	View DL Edit
serializer.py	4.07 MB	View DL Edit
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_yaml.cpython-39-x86_64-linux-gnu.so	240.62 MB	View DL Edit
__init__.py	12.86 MB	View DL Edit

Edit file: /lib64/python3.9/site-packages/yaml/resolver.py

__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], [])
            wildcard_resolvers = self.yaml_implicit_resolvers.get(None, [])
            for tag, regexp in resolvers + wildcard_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('!&*'))

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