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LibWeb: Implement scientific notation parsing in PathDataParser

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This was required by webkit.org and is based on the following spec:
https://svgwg.org/svg2-draft/paths.html#PathDataBNF
This commit is contained in:
Idan Horowitz 2021-04-21 16:03:01 +03:00 committed by Andreas Kling
parent 8bb4409a5d
commit ec67b1ac32
Notes: sideshowbarker 2024-07-18 19:18:07 +09:00 
Author: https://github.com/IdanHo
Commit: https://github.com/SerenityOS/serenity/commit/ec67b1ac32d
Pull-request: https://github.com/SerenityOS/serenity/pull/6534
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/linusg
1 changed files with 28 additions and 2 deletions
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30
Userland/Libraries/LibWeb/SVG/SVGPathElement.cpp
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@ -390,8 +390,34 @@ float PathDataParser::parse_fractional_constant()
float PathDataParser::parse_number() float PathDataParser::parse_number()
{ {
auto number = parse_fractional_constant(); auto number = parse_fractional_constant();
if (match('e') || match('E'))
TODO(); if (!match('e') && !match('E'))
return number;
consume();
auto exponent_sign = parse_sign();
StringBuilder exponent_builder;
while (!done() && isdigit(ch()))
exponent_builder.append(consume());
VERIFY(exponent_builder.length() > 0);
auto exponent = exponent_builder.to_string().to_int().value();
// Fast path: If the number is 0, there's no point in computing the exponentiation.
if (number == 0)
return number;
if (exponent_sign < 0) {
for (int i = 0; i < exponent; ++i) {
number /= 10;
}
} else if (exponent_sign > 0) {
for (int i = 0; i < exponent; ++i) {
number *= 10;
}
}
return number; return number;
} }