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