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Filename :
svgparser.py
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#coding:utf-8 # Author: mozman --<mozman@gmx.at> # Purpose: svgparser using pyparser # Created: 16.10.2010 # Copyright (C) 2010, Manfred Moitzi # License: MIT License # depends on: pyparsing.py by Paul T. McGuire - http://pyparsing.wikispaces.com/ __all__ = ["is_valid_transferlist", "is_valid_pathdata", "is_valid_animation_timing"] import sys from pyparsing import * from functools import partial 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", ] sign = oneOf('+ -') comma = Literal(',') * (0, 1) # zero or one ',' semicolon = Literal(';') * (0, 1) # zero or one ';' integer_constant = Word(nums) exponent = CaselessLiteral('E') + Optional(sign) + integer_constant fractional_constant = Combine(Optional(integer_constant) + '.' + integer_constant) \ ^ Combine(integer_constant + '.') scientific_constant = Combine(fractional_constant + Optional(exponent)) \ ^ Combine(integer_constant + exponent) number = Combine(Optional(sign) + integer_constant) \ ^ Combine(Optional(sign) + scientific_constant) def has_valid_syntax(term, parser): try: parser.parseString(term, parseAll=True) return True except ParseException: return False def build_transferlist_parser(): matrix = Literal("matrix") + '(' + number + (Suppress(comma) + number) * 5 + ')' translate = Literal("translate") + '(' + number + Optional(comma + number) + ')' scale = Literal("scale") + '(' + number + Optional(comma + number) + ')' rotate = Literal("rotate") + '(' + number + Optional(comma + number + comma + number) + ')' skewX = Literal("skewX") + '(' + number + ')' skewY = Literal("skewY") + '(' + number + ')' transform = matrix | translate | scale | rotate | skewX | skewY return transform + ZeroOrMore(comma + transform) transferlist_parser = build_transferlist_parser() is_valid_transferlist = partial(has_valid_syntax, parser=transferlist_parser) def build_pathdata_parser(): coordinate = number coordinate_pair = coordinate + comma + coordinate nonnegative_number = integer_constant ^ scientific_constant flag = oneOf('0 1') comma_delimited_coordinates = coordinate + ZeroOrMore(comma + coordinate) comma_delimited_coordinate_pairs = coordinate_pair + ZeroOrMore(comma + coordinate_pair) closepath = oneOf('Z z') moveto = oneOf('M m') + comma_delimited_coordinate_pairs lineto = oneOf('L l') + comma_delimited_coordinate_pairs horizontal_lineto = oneOf('H h') + comma_delimited_coordinates vertical_lineto = oneOf('V v') + comma_delimited_coordinates curveto_argument_sequence = coordinate_pair + comma + coordinate_pair + comma + coordinate_pair curveto = oneOf('C c') + curveto_argument_sequence + ZeroOrMore(comma + curveto_argument_sequence) smooth_curveto_argument_sequence = coordinate_pair + comma + coordinate_pair smooth_curveto = oneOf('S s') + smooth_curveto_argument_sequence \ + ZeroOrMore(comma + smooth_curveto_argument_sequence) quadratic_bezier_curveto_argument_sequence = coordinate_pair + comma + coordinate_pair quadratic_bezier_curveto = oneOf('Q q') + quadratic_bezier_curveto_argument_sequence \ + ZeroOrMore(comma + quadratic_bezier_curveto_argument_sequence) smooth_quadratic_bezier_curveto = oneOf('T t') + coordinate_pair \ + ZeroOrMore(comma + coordinate_pair) elliptical_arc_argument = nonnegative_number + comma + nonnegative_number \ + comma + number + comma + flag + comma + flag + comma + coordinate_pair elliptical_arc = oneOf('A a') + elliptical_arc_argument \ + ZeroOrMore(comma + elliptical_arc_argument) drawto_command = closepath \ | lineto \ | horizontal_lineto \ | vertical_lineto \ | curveto \ | smooth_curveto \ | quadratic_bezier_curveto \ | smooth_quadratic_bezier_curveto \ | elliptical_arc return OneOrMore(moveto + ZeroOrMore(drawto_command)) pathdata_parser = build_pathdata_parser() is_valid_pathdata = partial(has_valid_syntax, parser=pathdata_parser) def build_clock_val_parser(): digit2 = Word(nums, exact=2) timecount = integer_constant fraction = integer_constant seconds = digit2 minutes = digit2 hours = integer_constant metric = oneOf("h min s ms") timecount_val = timecount + Optional("." + fraction) + Optional(metric) partial_clock_val = minutes + ":" + seconds + Optional("." + fraction) full_clock_val = hours + ":" + minutes + ":" + seconds + Optional("." + fraction) return full_clock_val | partial_clock_val | timecount_val def build_wall_clock_val_parser(): # http://www.w3.org/TR/2005/REC-SMIL2-20050107/smil-timing.html#Timing-WallclockSyncValueSyntax digit2 = Word(nums, exact=2) fraction = integer_constant seconds = digit2 minutes = digit2 hours24 = digit2 day = digit2 month = digit2 year = Word(nums, exact=4) tzd = Literal("Z") | (sign + hours24 + ":" + minutes) hhmmss = hours24 + ":" + minutes + Optional(":" + seconds + Optional("." + fraction)) walltime = hhmmss + Optional(tzd) date = year + "-" + month + "-" + day datetime = date + "T" + walltime return datetime | walltime | date def build_animation_timing_parser(): clock_val = build_clock_val_parser() wallclock_value = build_wall_clock_val_parser() event_ref = oneOf(event_names) # TODO: check id-value definition: is a leading '#' really valid? id_value = Optional("#") + Word(alphanums + "-_") opt_clock_val = Optional(sign + clock_val) wallclock_sync_value = Literal("wallclock(") + wallclock_value + ")" accesskey_value = Literal("accessKey(") + Word(alphas, exact=1) + ")" + opt_clock_val repeat_value = Optional(id_value + ".") + Literal("repeat(") + integer_constant + ")" + opt_clock_val event_value = Optional(id_value + ".") + event_ref + opt_clock_val syncbase_value = id_value + "." + oneOf("begin end") + opt_clock_val offset_value = Optional(sign) + clock_val begin_value = offset_value | syncbase_value | event_value | repeat_value \ | accesskey_value | wallclock_sync_value | Literal("indefinite") return begin_value + ZeroOrMore(semicolon + begin_value) animation_timing_parser = build_animation_timing_parser() is_valid_animation_timing = partial(has_valid_syntax, parser=animation_timing_parser)