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# Copyright (c) 2021, Manfred Moitzi
# License: MIT License
import pytest
import ezdxf
from ezdxf.blkrefs import BlockReferenceCounter, find_unreferenced_blocks
def test_non_exiting_handles_return_0():
doc = ezdxf.new()
ref_counter = BlockReferenceCounter(doc)
assert ref_counter.by_handle("xyz") == 0, "not existing handles should return 0"
assert ref_counter.by_name("xyz") == 0, "not existing block name should return 0"
def test_access_interface():
doc = ezdxf.new()
msp = doc.modelspace()
block = doc.blocks.new("First")
msp.add_blockref("First", (0, 0))
ref_counter = BlockReferenceCounter(doc)
assert ref_counter.by_handle(block.block_record_handle) == 1
assert ref_counter.by_name("First") == 1
def test_count_simple_references():
count = 10
doc = ezdxf.new()
doc.blocks.new("First")
msp = doc.modelspace()
psp = doc.layout()
for _ in range(count):
msp.add_blockref("First", (0, 0))
psp.add_blockref("First", (0, 0))
ref_counter = BlockReferenceCounter(doc)
assert ref_counter.by_name("First") == 20
def test_count_nested_block_references():
count = 10
doc = ezdxf.new()
block1 = doc.blocks.new("First")
block2 = doc.blocks.new("Second")
block1.add_blockref(block2.dxf.name, (0, 0))
msp = doc.modelspace()
for _ in range(count):
msp.add_blockref("First", (0, 0))
ref_counter = BlockReferenceCounter(doc)
assert ref_counter.by_name("First") == 10
assert ref_counter.by_name("Second") == 1, "referenced only once in block First"
def test_count_references_used_in_xdata():
doc = ezdxf.new()
msp = doc.modelspace()
block = doc.blocks.new("First")
handle = block.block_record.dxf.handle
line = msp.add_line((0, 0), (1, 0))
# attach XDATA handle to block reference
line.set_xdata("ezdxf", [(1005, handle)])
ref_counter = BlockReferenceCounter(doc)
assert ref_counter.by_handle(handle) == 1
def test_count_references_used_in_app_data():
doc = ezdxf.new()
msp = doc.modelspace()
block = doc.blocks.new("First")
handle = block.block_record.dxf.handle
line = msp.add_line((0, 0), (1, 0))
# attach XDATA handle to block reference
line.set_app_data("ezdxf", [(320, handle), (480, handle)])
ref_counter = BlockReferenceCounter(doc)
assert ref_counter.by_handle(handle) == 2
def test_count_references_used_in_xrecord():
doc = ezdxf.new()
block = doc.blocks.new("First")
handle = block.block_record.dxf.handle
xrecord = doc.rootdict.add_xrecord("Test")
xrecord.reset([(320, handle), (330, handle), (480, handle)])
ref_counter = BlockReferenceCounter(doc)
assert ref_counter.by_handle(handle) == 3
def test_count_references_in_header_section():
doc = ezdxf.new()
doc.blocks.new("Arrow")
for var_name in ("$DIMBLK", "$DIMBLK1", "$DIMBLK2", "$DIMLDRBLK"):
doc.header[var_name] = "Arrow"
ref_counter = BlockReferenceCounter(doc)
assert ref_counter.by_name("Arrow") == 4
def test_count_references_in_dimstyle():
doc = ezdxf.new()
doc.blocks.new("Arrow")
dimstyle = doc.dimstyles.new("Test")
dimstyle.dxf.dimblk = "Arrow"
dimstyle.dxf.dimblk1 = "Arrow"
dimstyle.dxf.dimblk2 = "Arrow"
dimstyle.dxf.dimldrblk = "Arrow"
ref_counter = BlockReferenceCounter(doc)
assert ref_counter.by_name("Arrow") == 4
def test_count_references_in_leader():
doc = ezdxf.new()
doc.blocks.new("Arrow")
msp = doc.modelspace()
msp.add_leader(
vertices=[(0, 0), (1, 0)],
override={
"dimblk": "Arrow", # ignored by LEADER
"dimblk1": "Arrow", # ignored by LEADER
"dimblk2": "Arrow", # ignored by LEADER
"dimldrblk": "Arrow", # stored in XDATA
},
)
ref_counter = BlockReferenceCounter(doc)
assert ref_counter.by_name("Arrow") == 1
def test_count_references_for_anonymous_dimension_block():
doc = ezdxf.new()
msp = doc.modelspace()
dim = msp.add_linear_dim(
base=(25, 10),
p1=(0, 0),
p2=(50, 0),
)
dim.render()
ref_counter = BlockReferenceCounter(doc)
assert ref_counter.by_name(dim.dimension.dxf.geometry) == 1
def test_count_references_in_mleader_style():
doc = ezdxf.new()
arrow = doc.blocks.new("Arrow")
arrow_handle = arrow.block_record.dxf.handle
block = doc.blocks.new("Block")
block_handle = block.block_record.dxf.handle
mleader_style = doc.mleader_styles.new("Test")
mleader_style.dxf.arrow_head_handle = arrow_handle
mleader_style.dxf.block_record_handle = block_handle
ref_counter = BlockReferenceCounter(doc)
assert ref_counter.by_handle(arrow_handle) == 1
assert ref_counter.by_handle(block_handle) == 1
class TestFindUnreferencedBlocks:
def test_empty_document_has_no_unreferenced_blocks(self):
doc = ezdxf.new()
assert len(find_unreferenced_blocks(doc)) == 0
def test_add_unreferenced_block(self):
doc = ezdxf.new()
doc.blocks.new("DUMMY")
names = find_unreferenced_blocks(doc)
assert len(names) == 1, "one unreferenced block expected"
assert "DUMMY" in names, "name of unreferenced block expected"
def test_add_referenced_block(self):
doc = ezdxf.new()
doc.blocks.new("DUMMY")
msp = doc.modelspace()
msp.add_blockref("DUMMY", (0, 0))
names = find_unreferenced_blocks(doc)
assert len(names) == 0, "no unreferenced block expected"
if __name__ == "__main__":
pytest.main([__file__])
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