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Edit File : resolver.py \| Size : 8.79 KB
__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('!&*')) Back

Edit File : resolver.py | Size : 8.79 KB

__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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