try a python script in runner
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# -*- coding: utf-8 -*-
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#
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# Copyright (c) Aaron Spike <aaron@ekips.org>
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# Aurélio A. Heckert <aurium(a)gmail.com>
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# Bulia Byak <buliabyak@users.sf.net>
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# Nicolas Dufour, nicoduf@yahoo.fr
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# Peter J. R. Moulder <pjrm@users.sourceforge.net>
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# Martin Owens <doctormo@gmail.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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"""
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Convert to and from various units and find the closest matching unit.
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"""
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import re
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# a dictionary of unit to user unit conversion factors
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CONVERSIONS = {
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"in": 96.0,
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"pt": 1.3333333333333333,
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"px": 1.0,
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"mm": 3.779527559055118,
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"cm": 37.79527559055118,
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"m": 3779.527559055118,
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"km": 3779527.559055118,
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"Q": 0.94488188976378,
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"pc": 16.0,
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"yd": 3456.0,
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"ft": 1152.0,
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"": 1.0, # Default px
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}
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# allowed unit types, including percentages, relative units, and others
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# that are not suitable for direct conversion to a length.
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# Note that this is _not_ an exhaustive list of allowed unit types.
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UNITS = [
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"in",
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"pt",
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"px",
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"mm",
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"cm",
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"m",
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"km",
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"Q",
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"pc",
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"yd",
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"ft",
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"",
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"%",
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"em",
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"ex",
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"ch",
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"rem",
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"vw",
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"vh",
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"vmin",
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"vmax",
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"deg",
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"grad",
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"rad",
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"turn",
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"s",
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"ms",
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"Hz",
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"kHz",
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"dpi",
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"dpcm",
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"dppx",
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]
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UNIT_MATCH = re.compile(rf"({'|'.join(UNITS)})")
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NUMBER_MATCH = re.compile(r"(([-+]?[0-9]+(\.[0-9]*)?|[-+]?\.[0-9]+)([eE][-+]?[0-9]+)?)")
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BOTH_MATCH = re.compile(rf"^\s*{NUMBER_MATCH.pattern}\s*{UNIT_MATCH.pattern}\s*$")
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def parse_unit(value, default_unit="px", default_value=None):
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"""
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Takes a value such as 55.32px and returns (55.32, 'px')
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Returns default (None) if no match can be found
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"""
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ret = BOTH_MATCH.match(str(value))
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if ret:
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return float(ret.groups()[0]), ret.groups()[-1] or default_unit
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return (default_value, default_unit) if default_value is not None else None
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def are_near_relative(point_a, point_b, eps=0.01):
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"""Return true if the points are near to eps"""
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return (point_a - point_b <= point_a * eps) and (
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point_a - point_b >= -point_a * eps
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)
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def discover_unit(value, viewbox, default="px"):
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"""Attempt to detect the unit being used based on the viewbox"""
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# Default 100px when width can't be parsed
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(value, unit) = parse_unit(value, default_value=100.0)
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if unit not in CONVERSIONS:
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return default
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this_factor = CONVERSIONS[unit] * value / viewbox
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# try to find the svgunitfactor in the list of units known. If we don't find
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# something, ...
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for unit, unit_factor in CONVERSIONS.items():
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if unit != "":
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# allow 1% error in factor
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if are_near_relative(this_factor, unit_factor, eps=0.01):
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return unit
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return default
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def convert_unit(value, to_unit, default="px"):
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"""Returns userunits given a string representation of units in another system
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Args:
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value: <length> string
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to_unit: unit to convert to
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default: if ``value`` contains no unit, what unit should be assumed.
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.. versionadded:: 1.1
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"""
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value, from_unit = parse_unit(value, default_unit=default, default_value=0.0)
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if from_unit in CONVERSIONS and to_unit in CONVERSIONS:
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return (
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value * CONVERSIONS[from_unit] / CONVERSIONS.get(to_unit, CONVERSIONS["px"])
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)
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return 0.0
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def render_unit(value, unit):
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"""Checks and then renders a number with its unit"""
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try:
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if isinstance(value, str):
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(value, unit) = parse_unit(value, default_unit=unit)
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return f"{value:.6g}{unit:s}"
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except TypeError:
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return ""
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