1 files changed, 202 insertions, 0 deletions
diff --git a/share/extensions/inkex/elements/_text.py b/share/extensions/inkex/elements/_text.py
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+++ b/share/extensions/inkex/elements/_text.py
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+# -*- coding: utf-8 -*-
+#
+# Copyright (c) 2020 Martin Owens <doctormo@gmail.com>
+#                    Thomas Holder <thomas.holder@schrodinger.com>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# pylint: disable=arguments-differ
+"""
+Provide text based element classes interface.
+
+Because text is not rendered at all, no information about a text's path
+size or actual location can be generated yet.
+"""
+from __future__ import annotations
+
+from tempfile import TemporaryDirectory
+
+from ..interfaces.IElement import BaseElementProtocol
+from ..paths import Path
+from ..transforms import Transform, BoundingBox
+from ..command import inkscape, write_svg
+from ._base import BaseElement, ShapeElement
+from ._polygons import PathElementBase
+
+
+class TextBBMixin:  # pylint: disable=too-few-public-methods
+    """Mixin to query the bounding box from Inkscape
+
+    .. versionadded:: 1.2"""
+
+    def get_inkscape_bbox(self: BaseElementProtocol) -> BoundingBox:
+        """Query the bbbox of a single object. This calls the Inkscape command,
+        so it is rather slow to use in a loop."""
+        with TemporaryDirectory(prefix="inkscape-command") as tmpdir:
+            svg_file = write_svg(self.root, tmpdir, "input.svg")
+            out = inkscape(svg_file, "-X", "-Y", "-W", "-H", query_id=self.get_id())
+            out = list(map(self.root.viewport_to_unit, out.splitlines()))
+            if len(out) != 4:
+                raise ValueError("Error: Bounding box computation failed")
+            return BoundingBox.new_xywh(*out)
+
+
+class FlowRegion(ShapeElement):
+    """SVG Flow Region (SVG 2.0)"""
+
+    tag_name = "flowRegion"
+
+    def get_path(self):
+        # This ignores flowRegionExcludes
+        return sum([child.path for child in self], Path())
+
+
+class FlowRoot(ShapeElement, TextBBMixin):
+    """SVG Flow Root (SVG 2.0)"""
+
+    tag_name = "flowRoot"
+
+    @property
+    def region(self):
+        """Return the first flowRegion in this flowRoot"""
+        return self.findone("svg:flowRegion")
+
+    def get_path(self):
+        region = self.region
+        return region.get_path() if region is not None else Path()
+
+
+class FlowPara(ShapeElement):
+    """SVG Flow Paragraph (SVG 2.0)"""
+
+    tag_name = "flowPara"
+
+    def get_path(self):
+        # XXX: These empty paths mean the bbox for text elements will be nothing.
+        return Path()
+
+
+class FlowDiv(ShapeElement):
+    """SVG Flow Div (SVG 2.0)"""
+
+    tag_name = "flowDiv"
+
+    def get_path(self):
+        # XXX: These empty paths mean the bbox for text elements will be nothing.
+        return Path()
+
+
+class FlowSpan(ShapeElement):
+    """SVG Flow Span (SVG 2.0)"""
+
+    tag_name = "flowSpan"
+
+    def get_path(self):
+        # XXX: These empty paths mean the bbox for text elements will be nothing.
+        return Path()
+
+
+class TextElement(ShapeElement, TextBBMixin):
+    """A Text element"""
+
+    tag_name = "text"
+    x = property(lambda self: self.to_dimensionless(self.get("x", 0)))
+    y = property(lambda self: self.to_dimensionless(self.get("y", 0)))
+
+    def get_path(self):
+        return Path()
+
+    def tspans(self):
+        """Returns all children that are tspan elements"""
+        return self.findall("svg:tspan")
+
+    def get_text(self, sep="\n"):
+        """Return the text content including tspans"""
+        nodes = [self] + list(self.tspans())
+        return sep.join([elem.text for elem in nodes if elem.text is not None])
+
+    def shape_box(self, transform=None):
+        """
+        Returns a horrible bounding box that just contains the coord points
+        of the text without width or height (which is impossible to calculate)
+        """
+        effective_transform = Transform(transform) @ self.transform
+        x, y = effective_transform.apply_to_point((self.x, self.y))
+        bbox = BoundingBox(x, y)
+        for tspan in self.tspans():
+            bbox += tspan.bounding_box(effective_transform)
+        return bbox
+
+
+class TextPath(ShapeElement, TextBBMixin):
+    """A textPath element"""
+
+    tag_name = "textPath"
+
+    def get_path(self):
+        return Path()
+
+
+class Tspan(ShapeElement, TextBBMixin):
+    """A tspan text element"""
+
+    tag_name = "tspan"
+    x = property(lambda self: self.to_dimensionless(self.get("x", 0)))
+    y = property(lambda self: self.to_dimensionless(self.get("y", 0)))
+
+    @classmethod
+    def superscript(cls, text):
+        """Adds a superscript tspan element"""
+        return cls(text, style="font-size:65%;baseline-shift:super")
+
+    def get_path(self):
+        return Path()
+
+    def shape_box(self, transform=None):
+        """
+        Returns a horrible bounding box that just contains the coord points
+        of the text without width or height (which is impossible to calculate)
+        """
+        effective_transform = Transform(transform) @ self.transform
+        x1, y1 = effective_transform.apply_to_point((self.x, self.y))
+        fontsize = self.to_dimensionless(self.style.get("font-size", "12px"))
+        x2 = self.x + 0  # XXX This is impossible to calculate!
+        y2 = self.y + float(fontsize)
+        x2, y2 = effective_transform.apply_to_point((x2, y2))
+        return BoundingBox((x1, x2), (y1, y2))
+
+
+class SVGfont(BaseElement):
+    """An svg font element"""
+
+    tag_name = "font"
+
+
+class FontFace(BaseElement):
+    """An svg font font-face element"""
+
+    tag_name = "font-face"
+
+
+class Glyph(PathElementBase):
+    """An svg font glyph element"""
+
+    tag_name = "glyph"
+
+
+class MissingGlyph(BaseElement):
+    """An svg font missing-glyph element"""
+
+    tag_name = "missing-glyph"