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from __future__ import annotations
from ruyaml.anchor import Anchor
if False: # MYPY
from typing import Any, Dict, List, Text # NOQA
from ruyaml.compat import SupportsIndex
__all__ = [
'ScalarString',
'LiteralScalarString',
'FoldedScalarString',
'SingleQuotedScalarString',
'DoubleQuotedScalarString',
'PlainScalarString',
# PreservedScalarString is the old name, as it was the first to be preserved on rt,
# use LiteralScalarString instead
'PreservedScalarString',
]
class ScalarString(str):
__slots__ = Anchor.attrib
def __new__(cls, *args: Any, **kw: Any) -> Any:
anchor = kw.pop('anchor', None)
ret_val = str.__new__(cls, *args, **kw)
if anchor is not None:
ret_val.yaml_set_anchor(anchor, always_dump=True)
return ret_val
def replace(self, old: Any, new: Any, maxreplace: SupportsIndex = -1) -> Any:
return type(self)((str.replace(self, old, new, maxreplace)))
@property
def anchor(self) -> Any:
if not hasattr(self, Anchor.attrib):
setattr(self, Anchor.attrib, Anchor())
return getattr(self, Anchor.attrib)
def yaml_anchor(self, any: bool = False) -> Any:
if not hasattr(self, Anchor.attrib):
return None
if any or self.anchor.always_dump:
return self.anchor
return None
def yaml_set_anchor(self, value: Any, always_dump: bool = False) -> None:
self.anchor.value = value
self.anchor.always_dump = always_dump
class LiteralScalarString(ScalarString):
__slots__ = 'comment' # the comment after the | on the first line
style = '|'
def __new__(cls, value: Text, anchor: Any = None) -> Any:
return ScalarString.__new__(cls, value, anchor=anchor)
PreservedScalarString = LiteralScalarString
class FoldedScalarString(ScalarString):
__slots__ = ('fold_pos', 'comment') # the comment after the > on the first line
style = '>'
def __new__(cls, value: Text, anchor: Any = None) -> Any:
return ScalarString.__new__(cls, value, anchor=anchor)
class SingleQuotedScalarString(ScalarString):
__slots__ = ()
style = "'"
def __new__(cls, value: Text, anchor: Any = None) -> Any:
return ScalarString.__new__(cls, value, anchor=anchor)
class DoubleQuotedScalarString(ScalarString):
__slots__ = ()
style = '"'
def __new__(cls, value: Text, anchor: Any = None) -> Any:
return ScalarString.__new__(cls, value, anchor=anchor)
class PlainScalarString(ScalarString):
__slots__ = ()
style = ''
def __new__(cls, value: Text, anchor: Any = None) -> Any:
return ScalarString.__new__(cls, value, anchor=anchor)
def preserve_literal(s: Text) -> Text:
return LiteralScalarString(s.replace('\r\n', '\n').replace('\r', '\n'))
def walk_tree(base: Any, map: Any = None) -> None:
"""
the routine here walks over a simple yaml tree (recursing in
dict values and list items) and converts strings that
have multiple lines to literal scalars
You can also provide an explicit (ordered) mapping for multiple transforms
(first of which is executed):
map = ruyaml.compat.ordereddict
map['\n'] = preserve_literal
map[':'] = SingleQuotedScalarString
walk_tree(data, map=map)
"""
from collections.abc import MutableMapping, MutableSequence
if map is None:
map = {'\n': preserve_literal}
if isinstance(base, MutableMapping):
for k in base:
v: Text = base[k]
if isinstance(v, str):
for ch in map:
if ch in v:
base[k] = map[ch](v)
break
else:
walk_tree(v, map=map)
elif isinstance(base, MutableSequence):
for idx, elem in enumerate(base):
if isinstance(elem, str):
for ch in map:
if ch in elem:
base[idx] = map[ch](elem)
break
else:
walk_tree(elem, map=map)
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