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Handle unusual use of - in .svg files

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Previously valid SVG strings such as
m 547.56916,962.17731 c 10e-6,25.66886
M831,144.861c-0.236,0.087-0.423,0.255-0.629,

would fail to parse.

Fix by Henning STALHKE
This commit is contained in:
Stuart Buchanan 2020-08-19 20:09:06 +01:00
parent c7d63fb191
commit 45b97601f2
1 changed files with 27 additions and 9 deletions
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36
Nasal/canvas/svg.nas
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@ -207,27 +207,45 @@ var parsesvg = func(group, path, options = nil)
while(1)
{
# skip trailing spaces
# skip leading spaces
pos = path_data.find_first_not_of("\t\n ", pos);
if( pos < 0 )
break;
# get command
# get command (single character);
var cmd = substr(path_data, pos, 1);
pos += 1;
# and get all following arguments
# the '-' is kind of hard, it belongs to a number, might appear twice in
# one arg (e.g. -2e-3) and some SVG do not separate args starting with '-'
# so the '-' is the separator as well in this case.
# SVG samples (cut)
# 1: m 547.56916,962.17731 c 10e-6,25.66886 -20.80872,46.47759 -46.47758,46.47759 -25.66886,0 ...
# 2: M831,144.861c-0.236,0.087-0.423,0.255-0.629,0.39c-1.169,0.765-2.333,1.536-3.499,2.305 c-0.019,0.013-0.041, ...
var args = [];
#skip non-argument spaces and separator
pos = path_data.find_first_not_of(",\t\n ", pos);
var start_num = pos;
while(1)
{
pos = path_data.find_first_not_of(",\t\n ", pos);
if( pos < 0 )
break;
var start_num = pos;
pos = path_data.find_first_not_of("e-.0123456789", start_num);
if( start_num == pos )
break;
if (pos < 0) break;
start_num = pos;
while (1) {
var chr1 = substr(path_data, pos, 1);
if (chr1 == "-")
pos = path_data.find_first_not_of("e.0123456789", pos + 1);
else
pos = path_data.find_first_not_of("e.0123456789", pos);
#check for e- (e.g. 42e-6)
if (pos > 0 and substr(path_data, pos - 1, 1) == "e"
and substr(path_data, pos, 1) == "-")
continue;
else
break;
}
if (start_num == pos) break;
append(args, substr( path_data,
start_num,