1#!/usr/bin/env python 2# coding:utf-8 3# Authors: mozman <me@mozman.at>, Florian Festi 4# Purpose: svgparser using re module 5# Created: 16.10.2010 6# Copyright (c) 2010, Manfred Moitzi & 2020, Florian Festi 7# License: MIT License 8 9__all__ = ["is_valid_transferlist", "is_valid_pathdata", "is_valid_animation_timing"] 10 11import re 12 13event_names = [ 14 "focusin", "focusout", "activate", "click", "mousedown", "mouseup", "mouseover", 15 "mousemove", "mouseout", "DOMSubtreeModified", "DOMNodeInserted", "DOMNodeRemoved", 16 "DOMNodeRemovedFromDocument", "DOMNodeInsertedtoDocument", "DOMAttrModified", 17 "DOMCharacterDataModified", "SVGLoad", "SVGUnload", "SVGAbort", "SVGError", 18 "SVGResize", "SVGScroll", "SVGZoom", "beginEvent", "endEvent", "repeatEvent", 19] 20 21c = r"\s*[, ]\s*" 22integer_constant = r"\d+" 23exponent = r"([eE][+-]?\d+)" 24nonnegative_number = fr"(\d+\.?\d*|\.\d+){exponent}?" 25number = r"[+-]?" + nonnegative_number 26flag = r"[01]" 27 28comma_delimited_coordinates = fr"\s*{number}({c}{number})*\s*" 29two_comma_delimited_numbers = fr"\s*{number}({c}{number}\s*)" "{1}" 30four_comma_delimited_numbers = fr"\s*{number}\s*({c}{number}\s*)" "{3}" 31six_comma_delimited_numbers = fr"\s*{number}\s*({c}{number}\s*)" "{5}" 32comma_delimited_coordinate_pairs = fr"{two_comma_delimited_numbers}({c}{two_comma_delimited_numbers})*" 33 34 35def is_valid(regex): 36 reg = re.compile(regex) 37 38 def f(term): 39 return bool(reg.fullmatch(term)) 40 41 return f 42 43 44def build_transferlist_parser(): 45 matrix = fr"matrix\s*\(\s*{six_comma_delimited_numbers}\s*\)" 46 translate = fr"translate\s*\(\s*{number}({c}{number})?\s*\)" 47 scale = fr"scale\s*\(\s*{number}({c}{number})?\s*\)" 48 rotate = fr"rotate\s*\(\s*{number}({c}{number}{c}{number})?\s*\)" 49 skewX = fr"skewX\s*\(\s*{number}\s*\)" 50 skewY = fr"skewY\s*\(\s*{number}\s*\)" 51 52 tl_re = "|".join((fr"(\s*{cmd}\s*)" for cmd in ( 53 matrix, translate, scale, rotate, skewX, skewY))) 54 return fr"({tl_re})({c}({tl_re}))*" 55 56 57is_valid_transferlist = is_valid(build_transferlist_parser()) 58 59 60def build_pathdata_parser(): 61 moveto = fr"[mM]\s*{comma_delimited_coordinate_pairs}" 62 lineto = fr"[lL]\s*{comma_delimited_coordinate_pairs}" 63 horizontal_lineto = fr"[hH]\s*{comma_delimited_coordinates}" 64 vertical_lineto = fr"[vV]\s*{comma_delimited_coordinates}" 65 curveto = fr"[cC]\s*({six_comma_delimited_numbers})({c}{six_comma_delimited_numbers})*" 66 smooth_curveto = fr"[sS]{four_comma_delimited_numbers}({c}{four_comma_delimited_numbers})*" 67 quadratic_bezier_curveto = fr"[qQ]{four_comma_delimited_numbers}({c}{four_comma_delimited_numbers})*" 68 smooth_quadratic_bezier_curveto = fr"[tT]\s*{comma_delimited_coordinate_pairs}" 69 70 elliptical_arc_argument = fr"{c}".join(( 71 fr"{nonnegative_number}", 72 fr"{nonnegative_number}", 73 fr"{number}", 74 fr"{flag}", 75 fr"{flag}", 76 fr"{number}", 77 fr"{number}",)) 78 elliptical_arc_argument = r"\s*" + elliptical_arc_argument + r"\s*" 79 elliptical_arc = fr"[aA]({elliptical_arc_argument})({c}{elliptical_arc_argument})*" 80 81 drawto_command = "|".join((fr"(\s*{cmd}\s*)" for cmd in ( 82 moveto, lineto, horizontal_lineto, vertical_lineto, "[zZ]", 83 curveto, smooth_curveto, quadratic_bezier_curveto, 84 smooth_quadratic_bezier_curveto, elliptical_arc))) 85 86 return f"{moveto}({drawto_command})*" 87 88 89is_valid_pathdata = is_valid(build_pathdata_parser()) 90 91digit2 = r"\d{2}" 92digit4 = r"\d{4}" 93seconds = fr"\d+(\.\d+)?" 94seconds2 = fr"{digit2}(\.\d+)?" 95metric = "(h|min|s|ms)" 96 97 98def clock_val_re(): 99 timecount_val = fr"{seconds}\s*({metric})?" 100 clock_val = fr"{digit2}:({digit2}:)?{seconds2}" 101 return fr"({timecount_val}|{clock_val})" 102 103 104def wall_clock_val_re(): 105 hhmmss = fr"{digit2}:{digit2}(:{seconds2})?" 106 walltime = fr"{hhmmss}(Z|[+-]?{digit2}:{digit2})?" 107 date = fr"{digit4}-{digit2}-{digit2}" 108 datetime = fr"{date}(T{walltime})?" 109 return "(" + "|".join((walltime, datetime)) + ")" 110 111 112def build_animation_timing_parser(): 113 clock_val = clock_val_re() 114 wallclock_val = wall_clock_val_re() 115 116 event_ref = "(" + "|".join(event_names) + ")" 117 id_value = "#?[-_a-zA-Z0-9]+" 118 119 wallclock_sync_value = fr"wallclock\(\s*{wallclock_val}\s*\)" 120 accesskey_value = fr"accessKey\(\s*[a-zA-Z]\s*\)\s*([+-]?{clock_val})?" 121 repeat_value = fr"({id_value}\.)?repeat\s*\(\s*\d+\s*\)\s*([+-?]{clock_val})?" 122 event_value = fr"({id_value}\.)?{event_ref}([+-]?{clock_val})?" 123 offset_value = fr"[-+]?{clock_val}" 124 syncbase_value = fr"{id_value}\.(begin|end)({offset_value})?" 125 begin_value = "(" + "|".join((f"({reg})" for reg in ( 126 offset_value, syncbase_value, event_value, repeat_value, 127 accesskey_value, wallclock_sync_value, "indefinite"))) + ")" 128 return fr"{begin_value}({c}{begin_value})*" 129 130 131is_valid_animation_timing = is_valid(build_animation_timing_parser()) 132