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Mini Shell
#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)
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