kopia lustrzana https://github.com/inkstitch/inkstitch
138 wiersze
4.1 KiB
Python
138 wiersze
4.1 KiB
Python
import inkex
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import cubicsuperpath
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from .svg import apply_transforms
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from .svg.tags import SVG_USE_TAG, SVG_SYMBOL_TAG, CONNECTION_START, CONNECTION_END, XLINK_HREF
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class CommandParseError(Exception):
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pass
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class BaseCommand(object):
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def parse_symbol(self):
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if self.symbol.tag != SVG_SYMBOL_TAG:
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raise CommandParseError("use points to non-symbol")
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self.command = self.symbol.get('id')
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if self.command.startswith('inkstitch_'):
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self.command = self.command[10:]
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else:
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raise CommandParseError("symbol is not an Ink/Stitch command")
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def get_node_by_url(self,url):
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# url will be #path12345. Find the corresponding object.
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if url is None:
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raise CommandParseError("url is None")
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if not url.startswith('#'):
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raise CommandParseError("invalid connection url: %s" % url)
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id = url[1:]
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try:
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return self.svg.xpath(".//*[@id='%s']" % id)[0]
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except (IndexError, AttributeError):
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raise CommandParseError("could not find node by url %s" % id)
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class Command(BaseCommand):
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def __init__(self, connector):
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self.connector = connector
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self.svg = self.connector.getroottree().getroot()
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self.parse_command()
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def parse_connector_path(self):
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path = cubicsuperpath.parsePath(self.connector.get('d'))
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return apply_transforms(path, self.connector)
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def parse_command(self):
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path = self.parse_connector_path()
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neighbors = [
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(self.get_node_by_url(self.connector.get(CONNECTION_START)), path[0][0][1]),
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(self.get_node_by_url(self.connector.get(CONNECTION_END)), path[0][-1][1])
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]
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if neighbors[0][0].tag != SVG_USE_TAG:
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neighbors.reverse()
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if neighbors[0][0].tag != SVG_USE_TAG:
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raise CommandParseError("connector does not point to a use tag")
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self.symbol = self.get_node_by_url(neighbors[0][0].get(XLINK_HREF))
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self.parse_symbol()
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self.target = neighbors[1][0]
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self.target_point = neighbors[1][1]
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def __repr__(self):
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return "Command('%s', %s)" % (self.command, self.target_point)
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class StandaloneCommand(BaseCommand):
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def __init__(self, use):
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self.node = use
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self.svg = self.use.getroottree().getroot()
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self.parse_command()
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def parse_command(self):
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self.symbol = self.get_node_by_url(self.node.get(XLINK_HREF))
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if self.symbol.tag != SVG_SYMBOL_TAG:
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raise CommandParseError("use points to non-symbol")
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self.parse_symbol()
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def find_commands(node):
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"""Find the symbols this node is connected to and return them as Commands"""
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# find all paths that have this object as a connection
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xpath = ".//*[@inkscape:connection-start='#%(id)s' or @inkscape:connection-end='#%(id)s']" % dict(id=node.get('id'))
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connectors = node.getroottree().getroot().xpath(xpath, namespaces=inkex.NSS)
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# try to turn them into commands
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commands = []
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for connector in connectors:
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try:
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commands.append(Command(connector))
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except CommandParseError:
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# Parsing the connector failed, meaning it's not actually an Ink/Stitch command.
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pass
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return commands
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def layer_commands(layer, command):
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"""Find standalone (unconnected) command symbols in this layer."""
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commands = []
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for standalone_command in standalone_commands(layer.getroottree().getroot()):
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if standalone_command.command == command:
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if layer in command.iterancestors():
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commands.append(command)
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return commands
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def standalone_commands(svg):
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"""Find all unconnected command symbols in the SVG."""
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xpath = ".//svg:use[starts-with(@xlink:href, '#inkstitch_')]"
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symbols = svg.xpath(xpath, namespace=inkex.NSS)
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commands = []
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for symbol in symbols:
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try:
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commands.append(StandaloneCommand(symbol))
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except CommandParseError:
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pass
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return commands
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def is_command(node):
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return CONNECTION_START in node.attrib or CONNECTION_END in node.attrib
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