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Add optimization that prunes nested <g>-tags

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An optimization that prunes nested <g>-tags when they contain exactly
one <g> and nothing else (except whitespace nodes).  This looks a bit
like `removeNestedGroups` except it only touches <g> tags without
attributes (but can remove <g>-tags completely from a tree, whereas
this optimization always leaves at least one <g> tag behind).

Closes: #215
Signed-off-by: Niels Thykier <niels@thykier.net>
This commit is contained in:
Niels Thykier 2020-05-17 20:20:59 +00:00
parent 7e917c9ca0
commit e8e104d8b8
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5 changed files with 216 additions and 0 deletions
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE svg PUBLIC '-//W3C//DTD SVG 1.1//EN' 'http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd'>
<svg viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
<g font-family="Liberation Sans,Arial,Helvetica,sans-serif">
<g text-anchor="middle">
<g font-weight="400">
<g font-size="24">
<text x="50" y="30">Text1</text>
<text x="50" y="55">Text2</text>
<text x="50" y="80">Text3</text>
</g>
</g>
</g>
</g>
</svg>
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE svg PUBLIC '-//W3C//DTD SVG 1.1//EN' 'http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd'>
<svg viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
<g font-family="Liberation Sans,Arial,Helvetica,sans-serif">
<g text-anchor="middle">
<g font-weight="400">
<text x="50" y="30">Text1</text>
<g font-size="24">
<text x="50" y="55">Text2</text>
<text x="50" y="80">Text3</text>
</g>
</g>
</g>
</g>
</svg>
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE svg PUBLIC '-//W3C//DTD SVG 1.1//EN' 'http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd'>
<svg viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
<g font-family="Liberation Sans,Arial,Helvetica,sans-serif">
<g text-anchor="middle">
<g font-weight="400">
<g id="foo" font-size="24">
<text x="50" y="30">Text1</text>
<text x="50" y="55">Text2</text>
<text x="50" y="80">Text3</text>
</g>
</g>
</g>
</g>
</svg>
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