57 خطوط
3.6 KiB
Python
57 خطوط
3.6 KiB
Python
"""Safe SVG serializer: only application-owned SVG tags and attributes are emitted."""
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import re
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from xml.etree.ElementTree import Element, SubElement, tostring
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from .models.schematic import Document
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# XML 1.0 cannot represent these controls. They never become markup or CSS.
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CONTROL = re.compile('[\x00-\x08\x0b\x0c\x0e-\x1f\ud800-\udfff]')
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def clean(value): return CONTROL.sub('', str(value))
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def node(parent, tag, **attrs):
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return SubElement(parent, tag, {k.replace('_', '-'): clean(v) for k, v in attrs.items()})
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def svg_document(doc: Document, annotations=None, id_prefix="") -> bytes:
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b = doc.sheet.bounds
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root = Element('svg', {'xmlns': 'http://www.w3.org/2000/svg', 'viewBox': f'{b.x} {b.y} {b.width} {b.height}',
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'preserveAspectRatio': 'xMidYMid meet', 'role': 'img', 'aria-label': 'Schematic'})
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node(root, 'rect', x=b.x, y=b.y, width=b.width, height=b.height, fill=doc.sheet.background)
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defs = node(root, 'defs')
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for i, p in enumerate(doc.primitives):
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target = root
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if annotations is not None:
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annotation = annotations.get(p.component_id or p.object_id)
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target = node(root, 'g', data_object_id=p.component_id or p.object_id, data_change_id=annotation['id'] if annotation else '')
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if p.clip:
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clip = node(defs, 'clipPath', id=f'{id_prefix}clip-{i}', clipPathUnits='userSpaceOnUse')
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c = p.clip
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node(clip, 'rect', x=c.x, y=c.y, width=c.width, height=c.height)
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target = node(target, 'g', clip_path=f'url(#{id_prefix}clip-{i})')
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if p.kind == 'path':
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n = node(target, 'path', d=p.path, stroke=p.stroke, fill=p.fill,
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stroke_width=p.width, stroke_linecap='round', stroke_linejoin='round', fill_rule=p.fill_rule)
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if p.dash: n.set('stroke-dasharray', ' '.join(map(str, p.dash)))
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elif p.kind == 'image':
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# Populated only by the trusted bounded raster decoder; never a source URL.
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if p.image_data.startswith('data:image/png;base64,'):
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node(target, 'image', x=p.bounds.x, y=p.bounds.y, width=p.bounds.width, height=p.bounds.height,
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href=p.image_data, preserveAspectRatio='xMidYMid meet' if p.keep_aspect else 'none')
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else:
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transform = f'translate({p.position.x} {p.position.y}) rotate({p.rotation})'
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if p.mirrored: transform += ' scale(-1 1)'
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n = node(target, 'text', transform=transform, fill=p.stroke, font_family=p.font_family,
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font_size=p.font_size, font_weight='bold' if p.bold else 'normal',
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font_style='italic' if p.italic else 'normal', text_anchor=p.anchor,
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dominant_baseline=p.baseline, text_decoration='underline' if p.underline else 'none')
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n.set('{http://www.w3.org/XML/1998/namespace}space', 'preserve')
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n.text = clean(p.text)
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if annotations is not None:
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colors = {'added':'#16854b','removed':'#cf3545','modified':'#b87b09','moved':'#2676c5'}
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overlay = node(root, 'g', pointer_events='none')
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for annotation in annotations.values():
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b = annotation.get('bounds')
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if not b: continue
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color = colors[annotation['status']]
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node(overlay, 'rect', x=b['x']-2, y=b['y']-2, width=max(4,b['width']+4), height=max(4,b['height']+4),
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fill=color, fill_opacity='.09', stroke=color, stroke_width='1.5', vector_effect='non-scaling-stroke',
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data_change_id=annotation['id'], data_diff_box='true')
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return tostring(root, encoding='utf-8', xml_declaration=True)
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