132 lines
4.8 KiB
Python
132 lines
4.8 KiB
Python
#!/usr/bin/env python
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# coding:utf-8
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# Authors: mozman <me@mozman.at>, Florian Festi
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# Purpose: svgparser using re module
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# Created: 16.10.2010
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# Copyright (c) 2010, Manfred Moitzi & 2020, Florian Festi
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# License: MIT License
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__all__ = ["is_valid_transferlist", "is_valid_pathdata", "is_valid_animation_timing"]
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import re
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event_names = [
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"focusin", "focusout", "activate", "click", "mousedown", "mouseup", "mouseover",
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"mousemove", "mouseout", "DOMSubtreeModified", "DOMNodeInserted", "DOMNodeRemoved",
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"DOMNodeRemovedFromDocument", "DOMNodeInsertedtoDocument", "DOMAttrModified",
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"DOMCharacterDataModified", "SVGLoad", "SVGUnload", "SVGAbort", "SVGError",
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"SVGResize", "SVGScroll", "SVGZoom", "beginEvent", "endEvent", "repeatEvent",
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]
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c = r"\s*[, ]\s*"
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integer_constant = r"\d+"
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exponent = r"([eE][+-]?\d+)"
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nonnegative_number = fr"(\d+\.?\d*|\.\d+){exponent}?"
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number = r"[+-]?" + nonnegative_number
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flag = r"[01]"
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comma_delimited_coordinates = fr"\s*{number}({c}{number})*\s*"
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two_comma_delimited_numbers = fr"\s*{number}({c}{number}\s*)" "{1}"
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four_comma_delimited_numbers = fr"\s*{number}\s*({c}{number}\s*)" "{3}"
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six_comma_delimited_numbers = fr"\s*{number}\s*({c}{number}\s*)" "{5}"
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comma_delimited_coordinate_pairs = fr"{two_comma_delimited_numbers}({c}{two_comma_delimited_numbers})*"
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def is_valid(regex):
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reg = re.compile(regex)
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def f(term):
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return bool(reg.fullmatch(term))
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return f
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def build_transferlist_parser():
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matrix = fr"matrix\s*\(\s*{six_comma_delimited_numbers}\s*\)"
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translate = fr"translate\s*\(\s*{number}({c}{number})?\s*\)"
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scale = fr"scale\s*\(\s*{number}({c}{number})?\s*\)"
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rotate = fr"rotate\s*\(\s*{number}({c}{number}{c}{number})?\s*\)"
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skewX = fr"skewX\s*\(\s*{number}\s*\)"
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skewY = fr"skewY\s*\(\s*{number}\s*\)"
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tl_re = "|".join((fr"(\s*{cmd}\s*)" for cmd in (
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matrix, translate, scale, rotate, skewX, skewY)))
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return fr"({tl_re})({c}({tl_re}))*"
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is_valid_transferlist = is_valid(build_transferlist_parser())
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def build_pathdata_parser():
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moveto = fr"[mM]\s*{comma_delimited_coordinate_pairs}"
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lineto = fr"[lL]\s*{comma_delimited_coordinate_pairs}"
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horizontal_lineto = fr"[hH]\s*{comma_delimited_coordinates}"
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vertical_lineto = fr"[vV]\s*{comma_delimited_coordinates}"
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curveto = fr"[cC]\s*({six_comma_delimited_numbers})({c}{six_comma_delimited_numbers})*"
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smooth_curveto = fr"[sS]{four_comma_delimited_numbers}({c}{four_comma_delimited_numbers})*"
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quadratic_bezier_curveto = fr"[qQ]{four_comma_delimited_numbers}({c}{four_comma_delimited_numbers})*"
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smooth_quadratic_bezier_curveto = fr"[tT]\s*{comma_delimited_coordinate_pairs}"
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elliptical_arc_argument = fr"{c}".join((
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fr"{nonnegative_number}",
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fr"{nonnegative_number}",
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fr"{number}",
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fr"{flag}",
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fr"{flag}",
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fr"{number}",
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fr"{number}",))
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elliptical_arc_argument = r"\s*" + elliptical_arc_argument + r"\s*"
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elliptical_arc = fr"[aA]({elliptical_arc_argument})({c}{elliptical_arc_argument})*"
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drawto_command = "|".join((fr"(\s*{cmd}\s*)" for cmd in (
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moveto, lineto, horizontal_lineto, vertical_lineto, "[zZ]",
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curveto, smooth_curveto, quadratic_bezier_curveto,
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smooth_quadratic_bezier_curveto, elliptical_arc)))
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return f"{moveto}({drawto_command})*"
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is_valid_pathdata = is_valid(build_pathdata_parser())
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digit2 = r"\d{2}"
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digit4 = r"\d{4}"
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seconds = fr"\d+(\.\d+)?"
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seconds2 = fr"{digit2}(\.\d+)?"
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metric = "(h|min|s|ms)"
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def clock_val_re():
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timecount_val = fr"{seconds}\s*({metric})?"
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clock_val = fr"{digit2}:({digit2}:)?{seconds2}"
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return fr"({timecount_val}|{clock_val})"
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def wall_clock_val_re():
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hhmmss = fr"{digit2}:{digit2}(:{seconds2})?"
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walltime = fr"{hhmmss}(Z|[+-]?{digit2}:{digit2})?"
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date = fr"{digit4}-{digit2}-{digit2}"
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datetime = fr"{date}(T{walltime})?"
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return "(" + "|".join((walltime, datetime)) + ")"
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def build_animation_timing_parser():
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clock_val = clock_val_re()
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wallclock_val = wall_clock_val_re()
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event_ref = "(" + "|".join(event_names) + ")"
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id_value = "#?[-_a-zA-Z0-9]+"
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wallclock_sync_value = fr"wallclock\(\s*{wallclock_val}\s*\)"
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accesskey_value = fr"accessKey\(\s*[a-zA-Z]\s*\)\s*([+-]?{clock_val})?"
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repeat_value = fr"({id_value}\.)?repeat\s*\(\s*\d+\s*\)\s*([+-?]{clock_val})?"
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event_value = fr"({id_value}\.)?{event_ref}([+-]?{clock_val})?"
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offset_value = fr"[-+]?{clock_val}"
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syncbase_value = fr"{id_value}\.(begin|end)({offset_value})?"
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begin_value = "(" + "|".join((f"({reg})" for reg in (
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offset_value, syncbase_value, event_value, repeat_value,
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accesskey_value, wallclock_sync_value, "indefinite"))) + ")"
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return fr"{begin_value}({c}{begin_value})*"
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is_valid_animation_timing = is_valid(build_animation_timing_parser())
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