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stepanalyser/.venv/lib/python3.12/site-packages/ezdxf/sections/table.py
Christian Anetzberger a197de9456 initial
2026-01-22 20:23:51 +01:00

780 lines
25 KiB
Python

# Copyright (c) 2011-2022, Manfred Moitzi
# License: MIT License
from __future__ import annotations
from typing import (
Generic,
Iterator,
List,
Optional,
TYPE_CHECKING,
TypeVar,
Union,
cast,
Sequence,
)
from collections import OrderedDict
import logging
from ezdxf.audit import Auditor, AuditError
from ezdxf.lldxf import const, validator
from ezdxf.entities.table import TableHead
from ezdxf.entities import (
factory,
DXFEntity,
Layer,
Linetype,
Textstyle,
VPort,
View,
AppID,
UCSTableEntry,
BlockRecord,
DimStyle,
is_graphic_entity,
)
if TYPE_CHECKING:
from ezdxf.document import Drawing
from ezdxf.lldxf.tagwriter import AbstractTagWriter
from ezdxf.entitydb import EntityDB
logger = logging.getLogger("ezdxf")
T = TypeVar("T", bound="DXFEntity")
class Table(Generic[T]):
TABLE_TYPE = "UNKNOWN"
def __init__(self) -> None:
self.doc: Optional[Drawing] = None
self.entries: dict[str, T] = OrderedDict()
self._head = TableHead()
def load(self, doc: Drawing, entities: Iterator[DXFEntity]) -> None:
"""Loading interface. (internal API)"""
self.doc = doc
table_head = next(entities)
if isinstance(table_head, TableHead):
self._head = table_head
else:
raise const.DXFStructureError("Critical structure error in TABLES section.")
expected_entry_dxftype = self.TABLE_TYPE
for table_entry in entities:
if table_entry.dxftype() == expected_entry_dxftype:
self._append(cast(T, table_entry))
else:
logger.warning(
f"Ignored invalid DXF entity type '{table_entry.dxftype()}'"
f" in {self.TABLE_TYPE} table."
)
def reset(self, doc: Drawing, handle: str) -> None:
"""Reset table. (internal API)"""
self.doc = doc
self._set_head(self.TABLE_TYPE, handle)
self.entries.clear()
def _set_head(self, name: str, handle: Optional[str] = None) -> None:
self._head = TableHead.new(
handle, owner="0", dxfattribs={"name": name}, doc=self.doc
)
@property
def head(self):
"""Returns table head entry."""
return self._head
@property
def name(self) -> str:
return self.TABLE_TYPE
@staticmethod
def key(name: str) -> str:
"""Unified table entry key."""
return validator.make_table_key(name)
def has_entry(self, name: str) -> bool:
"""Returns ``True`` if a table entry `name` exist."""
return self.key(name) in self.entries
__contains__ = has_entry
def __len__(self) -> int:
"""Count of table entries."""
return len(self.entries)
def __iter__(self) -> Iterator[T]:
"""Iterable of all table entries."""
for e in self.entries.values():
if e.is_alive:
yield e
def new(self, name: str, dxfattribs=None) -> T:
"""Create a new table entry `name`.
Args:
name: name of table entry
dxfattribs: additional DXF attributes for table entry
"""
if self.has_entry(name):
raise const.DXFTableEntryError(
f"{self.TABLE_TYPE} '{name}' already exists!"
)
dxfattribs = dxfattribs or {}
dxfattribs["name"] = name
dxfattribs["owner"] = self._head.dxf.handle
return self.new_entry(dxfattribs)
def get(self, name: str) -> T:
"""Returns table entry `name`.
Args:
name: name of table entry, case-insensitive
Raises:
DXFTableEntryError: table entry does not exist
"""
entry = self.entries.get(self.key(name))
if entry:
return entry
else:
raise const.DXFTableEntryError(name)
def get_entry_by_handle(self, handle: str) -> Optional[T]:
"""Returns table entry by handle or ``None`` if entry does not exist.
(internal API)
"""
entry = self.doc.entitydb.get(handle) # type: ignore
if entry and entry.dxftype() == self.TABLE_TYPE:
return entry # type: ignore
return None
def get_handle_of_entry(self, name: str) -> str:
"""Returns the handle of table entry by `name`, returns an empty string if no
entry for the given name exist.
Args:
name: name of table entry, case-insensitive
(internal API)
"""
entry = self.entries.get(self.key(name))
if entry is not None:
return entry.dxf.handle
return ""
def remove(self, name: str) -> None:
"""Removes table entry `name`.
Args:
name: name of table entry, case-insensitive
Raises:
DXFTableEntryError: table entry does not exist
"""
key = self.key(name)
entry = self.get(name)
self.entitydb.delete_entity(entry)
self.discard(key)
def duplicate_entry(self, name: str, new_name: str) -> T:
"""Returns a new table entry `new_name` as copy of `name`,
replaces entry `new_name` if already exist.
Args:
name: name of table entry, case-insensitive
new_name: name of duplicated table entry
Raises:
DXFTableEntryError: table entry does not exist
"""
entry = self.get(name)
entitydb = self.entitydb
if entitydb:
new_entry = entitydb.duplicate_entity(entry)
else: # only for testing!
new_entry = entry.copy()
new_entry.dxf.name = new_name
entry = cast(T, new_entry)
self._append(entry)
return entry
def discard(self, name: str) -> None:
"""Remove table entry without destroying object.
Args:
name: name of table entry, case-insensitive
(internal API)
"""
del self.entries[self.key(name)]
def replace(self, name: str, entry: T) -> None:
"""Replace table entry `name` by new `entry`. (internal API)"""
self.discard(name)
self._append(entry)
@property
def entitydb(self) -> EntityDB:
return self.doc.entitydb # type: ignore
def new_entry(self, dxfattribs) -> T:
"""Create and add new table-entry of type 'self.entry_dxftype'.
Does not check if an entry dxfattribs['name'] already exists!
Duplicate entries are possible for Viewports.
"""
assert self.doc is not None, "valid DXF document required"
entry = cast(T, factory.create_db_entry(self.TABLE_TYPE, dxfattribs, self.doc))
self._append(entry)
return entry
def _append(self, entry: T) -> None:
"""Add a table entry, replaces existing entries with same name.
(internal API).
"""
assert entry.dxftype() == self.TABLE_TYPE
self.entries[self.key(entry.dxf.name)] = entry
def add_entry(self, entry: T) -> None:
"""Add a table `entry`, created by other object than this table.
(internal API)
"""
if entry.dxftype() != self.TABLE_TYPE:
raise const.DXFTypeError(
f"Invalid table entry type {entry.dxftype()} "
f"for table {self.TABLE_TYPE}"
)
name = entry.dxf.name
if self.has_entry(name):
raise const.DXFTableEntryError(
f"{self._head.dxf.name} {name} already exists!"
)
if self.doc:
factory.bind(entry, self.doc)
entry.dxf.owner = self._head.dxf.handle
self._append(entry)
def export_dxf(self, tagwriter: AbstractTagWriter) -> None:
"""Export DXF representation. (internal API)"""
self.update_owner_handles()
# The table head itself has no owner and is therefore always '0':
self._head.dxf.owner = "0"
self._head.dxf.count = len(self)
self._head.export_dxf(tagwriter)
self.export_table_entries(tagwriter)
tagwriter.write_tag2(0, "ENDTAB")
def export_table_entries(self, tagwriter: AbstractTagWriter) -> None:
for entry in self.entries.values():
entry.export_dxf(tagwriter)
def update_owner_handles(self) -> None:
owner_handle = self._head.dxf.handle
for entry in self.entries.values():
entry.dxf.owner = owner_handle
def set_handle(self, handle: str):
"""Set new `handle` for table, updates also :attr:`owner` tag of table
entries. (internal API)
"""
if self._head.dxf.handle is None:
self._head.dxf.handle = handle
self.update_owner_handles()
def audit(self, auditor: Auditor):
# The table entries are stored in the entity database and are already
# audited!
self._fix_table_head(auditor)
self._fix_entry_handles(auditor)
def _fix_entry_handles(self, auditor: Auditor):
# Why: see duplicate handle issue #604
entitydb = self.entitydb
for entry in self:
entity = entitydb.get(entry.dxf.handle)
if entity is not entry: # duplicate handle usage
# This can break entities referring to this entity, but at
# least the DXF readable
entry.dxf.handle = entitydb.next_handle()
self.entitydb.add(entry)
auditor.fixed_error(
code=AuditError.INVALID_TABLE_HANDLE,
message=f"Fixed invalid table entry handle in {entry}",
)
def _fix_table_head(self, auditor: Auditor):
def fix_head():
head.dxf.handle = entitydb.next_handle()
entitydb.add(head)
if log:
auditor.fixed_error(
code=AuditError.INVALID_TABLE_HANDLE,
message=f"Fixed invalid table head handle in table {self.name}",
)
# fix silently for older DXF versions
log = auditor.doc.dxfversion > const.DXF12
head = self.head
# Another exception for an invalid owner tag, but this usage is
# covered in Auditor.check_owner_exist():
head.dxf.owner = "0"
handle = head.dxf.handle
entitydb = self.entitydb
if handle is None or handle == "0":
# Entity database does not assign new handle:
fix_head()
else:
# Why: see duplicate handle issue #604
entry = self.entitydb.get(handle)
if entry is not head: # another entity has the same handle!
fix_head()
# Just to be sure owner handle is valid in every circumstance:
self.update_owner_handles()
class LayerTable(Table[Layer]):
TABLE_TYPE = "LAYER"
def new_entry(self, dxfattribs) -> Layer:
layer = cast(Layer, super().new_entry(dxfattribs))
if self.doc:
layer.set_required_attributes()
return layer
def add(
self,
name: str,
*,
color: int = const.BYLAYER,
true_color: Optional[int] = None,
linetype: str = "Continuous",
lineweight: int = const.LINEWEIGHT_BYLAYER,
plot: bool = True,
transparency: Optional[float] = None,
dxfattribs=None,
) -> Layer:
"""Add a new :class:`~ezdxf.entities.Layer`.
Args:
name (str): layer name
color (int): :ref:`ACI` value, default is BYLAYER
true_color (int): true color value, use :func:`ezdxf.rgb2int` to
create ``int`` values from RGB values
linetype (str): line type name, default is "Continuous"
lineweight (int): line weight, default is BYLAYER
plot (bool): plot layer as bool, default is ``True``
transparency: transparency value in the range [0, 1], where 1 is
100% transparent and 0 is opaque
dxfattribs (dict): additional DXF attributes
"""
dxfattribs = dict(dxfattribs or {})
if validator.is_valid_aci_color(color):
dxfattribs["color"] = color
else:
raise const.DXFValueError(f"invalid color: {color}")
dxfattribs["linetype"] = linetype
if validator.is_valid_lineweight(lineweight):
dxfattribs["lineweight"] = lineweight
else:
raise const.DXFValueError(f"invalid lineweight: {lineweight}")
if true_color is not None:
dxfattribs["true_color"] = int(true_color)
dxfattribs["plot"] = int(plot)
layer = cast("Layer", self.new(name, dxfattribs))
if transparency is not None:
layer.transparency = transparency
return layer
def create_referenced_layers(self) -> None:
"""Create for all referenced layers table entries if not exist."""
if self.doc is None:
return
for e in self.doc.entitydb.values():
if not is_graphic_entity(e):
continue
layer_name = e.dxf.get("layer", "")
if layer_name and not self.has_entry(layer_name):
# create layer table entry with default settings
self.add(layer_name)
class LinetypeTable(Table[Linetype]):
TABLE_TYPE = "LTYPE"
def new_entry(self, dxfattribs) -> Linetype:
pattern = dxfattribs.pop("pattern", [0.0])
length = dxfattribs.pop("length", 0) # required for complex types
ltype = cast(Linetype, super().new_entry(dxfattribs))
ltype.setup_pattern(pattern, length)
return ltype
def add(
self,
name: str,
pattern: Union[Sequence[float], str],
*,
description: str = "",
length: float = 0.0,
dxfattribs=None,
) -> Linetype:
"""Add a new line type entry. The simple line type pattern is a list of
floats :code:`[total_pattern_length, elem1, elem2, ...]`
where an element > 0 is a line, an element < 0 is a gap and an
element == 0.0 is a dot. The definition for complex line types are
strings, like: ``'A,.5,-.2,["GAS",STANDARD,S=.1,U=0.0,X=-0.1,Y=-.05],-.25'``
similar to the line type definitions stored in the line definition
`.lin` files, for more information see the tutorial about complex line
types. Be aware that not many CAD applications and DXF viewers support
complex linetypes.
.. seealso::
- `Tutorial for simple line types <https://ezdxf.mozman.at/docs/tutorials/linetypes.html>`_
- `Tutorial for complex line types <https://ezdxf.mozman.at/docs/tutorials/linetypes.html#tutorial-for-complex-linetypes>`_
Args:
name (str): line type name
pattern: line type pattern as list of floats or as a string
description (str): line type description, optional
length (float): total pattern length, only for complex line types required
dxfattribs (dict): additional DXF attributes
"""
dxfattribs = dict(dxfattribs or {})
dxfattribs.update(
{
"name": name,
"description": str(description),
"pattern": pattern,
"length": float(length),
}
)
return self.new_entry(dxfattribs)
class TextstyleTable(Table[Textstyle]):
TABLE_TYPE = "STYLE"
def __init__(self) -> None:
super().__init__()
self.shx_files: dict[str, Textstyle] = dict()
def export_table_entries(self, tagwriter: AbstractTagWriter) -> None:
super().export_table_entries(tagwriter)
for shx_file in self.shx_files.values():
shx_file.export_dxf(tagwriter)
def _append(self, entry: Textstyle) -> None:
"""Add a table entry, replaces existing entries with same name.
(internal API).
"""
if entry.dxf.name == "" and (entry.dxf.flags & 1): # shx shape file
self.shx_files[self.key(entry.dxf.font)] = entry
else:
self.entries[self.key(entry.dxf.name)] = entry
def update_owner_handles(self) -> None:
super().update_owner_handles()
owner_handle = self._head.dxf.handle
for entry in self.shx_files.values():
entry.dxf.owner = owner_handle
def add(self, name: str, *, font: str, dxfattribs=None) -> Textstyle:
"""Add a new text style entry for TTF fonts. The entry must not yet
exist, otherwise an :class:`DXFTableEntryError` exception will be
raised.
Finding the TTF font files is the task of the DXF viewer and each
viewer is different (hint: support files).
Args:
name (str): text style name
font (str): TTF font file name like "Arial.ttf", the real font file
name from the file system is required and only the Windows filesystem
is case-insensitive.
dxfattribs (dict): additional DXF attributes
"""
dxfattribs = dict(dxfattribs or {})
dxfattribs.update(
{
"name": name,
"font": str(font),
"last_height": 2.5, # maybe required by AutoCAD
}
)
return self.new_entry(dxfattribs)
def add_shx(self, shx_file_name: str, *, dxfattribs=None) -> Textstyle:
"""Add a new shape font (SHX file) entry. These are special text style
entries and have no name. The entry must not yet exist, otherwise an
:class:`DXFTableEntryError` exception will be raised.
Locating the SHX files in the filesystem is the task of the DXF viewer and each
viewer is different (hint: support files).
Args:
shx_file_name (str): shape file name like "gdt.shx"
dxfattribs (dict): additional DXF attributes
"""
if self.find_shx(shx_file_name) is not None:
raise const.DXFTableEntryError(
f"{self._head.dxf.name} shape file entry for "
f"'{shx_file_name}' already exists!"
)
dxfattribs = dict(dxfattribs or {})
dxfattribs.update(
{
"name": "", # shape file entry has no name
"flags": 1, # shape file flag
"font": shx_file_name,
"last_height": 2.5, # maybe required by AutoCAD
}
)
return self.new_entry(dxfattribs)
def get_shx(self, shx_file_name: str) -> Textstyle:
"""Get existing entry for a shape file (SHX file), or create a new
entry.
Locating the SHX files in the filesystem is the task of the DXF viewer and each
viewer is different (hint: support files).
Args:
shx_file_name (str): shape file name like "gdt.shx"
"""
shape_file = self.find_shx(shx_file_name)
if shape_file is None:
return self.add_shx(shx_file_name)
return shape_file
def find_shx(self, shx_file_name: str) -> Optional[Textstyle]:
"""Find the shape file (SHX file) text style table entry, by a
case-insensitive search.
A shape file table entry has no name, so you have to search by the
font attribute.
Args:
shx_file_name (str): shape file name like "gdt.shx"
"""
return self.shx_files.get(self.key(shx_file_name))
def discard_shx(self, shx_file_name: str) -> None:
"""Discard the shape file (SHX file) text style table entry. Does not raise an
exception if the entry does not exist.
Args:
shx_file_name (str): shape file name like "gdt.shx"
"""
try:
del self.shx_files[self.key(shx_file_name)]
except KeyError:
pass
class ViewportTable(Table[VPort]):
TABLE_TYPE = "VPORT"
# Viewport-Table can have multiple entries with same name
# each table entry is a list of VPORT entries
def export_table_entries(self, tagwriter: AbstractTagWriter) -> None:
for entry in self.entries.values():
assert isinstance(entry, list)
for e in entry:
e.export_dxf(tagwriter)
def new(self, name: str, dxfattribs=None) -> VPort:
"""Create a new table entry."""
dxfattribs = dxfattribs or {}
dxfattribs["name"] = name
return self.new_entry(dxfattribs)
def add(self, name: str, *, dxfattribs=None) -> VPort:
"""Add a new modelspace viewport entry. A modelspace viewport
configuration can consist of multiple viewport entries with the same
name.
Args:
name (str): viewport name, multiple entries possible
dxfattribs (dict): additional DXF attributes
"""
dxfattribs = dict(dxfattribs or {})
dxfattribs["name"] = name
return self.new_entry(dxfattribs)
def remove(self, name: str) -> None:
"""Remove table-entry from table and entitydb by name."""
key = self.key(name)
entries = cast(List[DXFEntity], self.get(name))
for entry in entries:
self.entitydb.delete_entity(entry)
del self.entries[key]
def __iter__(self) -> Iterator[VPort]:
for entries in self.entries.values():
yield from iter(entries) # type: ignore
def _flatten(self) -> Iterator[VPort]:
for entries in self.entries.values():
yield from iter(entries) # type: ignore
def __len__(self) -> int:
# calling __iter__() invokes recursion!
return len(list(self._flatten()))
def new_entry(self, dxfattribs) -> VPort:
"""Create and add new table-entry of type 'self.entry_dxftype'.
Does not check if an entry dxfattribs['name'] already exists!
Duplicate entries are possible for Viewports.
"""
assert self.doc is not None, "valid DXF document expected"
entry = cast(
VPort,
factory.create_db_entry(self.TABLE_TYPE, dxfattribs, self.doc),
)
self._append(entry)
return entry
def duplicate_entry(self, name: str, new_name: str) -> VPort:
raise NotImplementedError()
def _append(self, entry: T) -> None:
key = self.key(entry.dxf.name)
if key in self.entries:
self.entries[key].append(entry) # type: ignore
else:
self.entries[key] = [entry] # type: ignore # store list of VPORT
def replace(self, name: str, entry: T) -> None:
self.discard(name)
config: list[T]
if isinstance(entry, list):
config = entry
else:
config = [entry]
if not config:
return
key = self.key(config[0].dxf.name)
self.entries[key] = config # type: ignore
def update_owner_handles(self) -> None:
owner_handle = self._head.dxf.handle
for entries in self.entries.values():
for entry in entries: # type: ignore
entry.dxf.owner = owner_handle
def get_config(self, name: str) -> list[VPort]:
"""Returns a list of :class:`~ezdxf.entities.VPort` objects, for
the multi-viewport configuration `name`.
"""
try:
return self.entries[self.key(name)] # type: ignore
except KeyError:
raise const.DXFTableEntryError(name)
def delete_config(self, name: str) -> None:
"""Delete all :class:`~ezdxf.entities.VPort` objects of the
multi-viewport configuration `name`.
"""
self.remove(name)
class AppIDTable(Table[AppID]):
TABLE_TYPE = "APPID"
def add(self, name: str, *, dxfattribs=None) -> AppID:
"""Add a new appid table entry.
Args:
name (str): appid name
dxfattribs (dict): DXF attributes
"""
dxfattribs = dict(dxfattribs or {})
dxfattribs["name"] = name
return self.new_entry(dxfattribs)
class ViewTable(Table[View]):
TABLE_TYPE = "VIEW"
def add(self, name: str, *, dxfattribs=None) -> View:
"""Add a new view table entry.
Args:
name (str): view name
dxfattribs (dict): DXF attributes
"""
dxfattribs = dict(dxfattribs or {})
dxfattribs["name"] = name
return self.new_entry(dxfattribs)
class BlockRecordTable(Table[BlockRecord]):
TABLE_TYPE = "BLOCK_RECORD"
def add(self, name: str, *, dxfattribs=None) -> BlockRecord:
"""Add a new block record table entry.
Args:
name (str): block record name
dxfattribs (dict): DXF attributes
"""
dxfattribs = dict(dxfattribs or {})
dxfattribs["name"] = name
return self.new_entry(dxfattribs)
class DimStyleTable(Table[DimStyle]):
TABLE_TYPE = "DIMSTYLE"
def add(self, name: str, *, dxfattribs=None) -> DimStyle:
"""Add a new dimension style table entry.
Args:
name (str): dimension style name
dxfattribs (dict): DXF attributes
"""
dxfattribs = dict(dxfattribs or {})
dxfattribs["name"] = name
return self.new_entry(dxfattribs)
class UCSTable(Table[UCSTableEntry]):
TABLE_TYPE = "UCS"
def add(self, name: str, *, dxfattribs=None) -> UCSTableEntry:
"""Add a new UCS table entry.
Args:
name (str): UCS name
dxfattribs (dict): DXF attributes
"""
dxfattribs = dict(dxfattribs or {})
dxfattribs["name"] = name
return self.new_entry(dxfattribs)