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LibWeb: Make an+b pattern selector serialization spec compliant

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stelar7 2022-05-07 23:26:58 +02:00 • committed by Linus Groh
parent b751f80166
commit 303b72d516
1 changed files with 30 additions and 1 deletions
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31
Userland/Libraries/LibWeb/CSS/Selector.h
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@ -44,9 +44,38 @@ public:
int step_size { 0 }; // "A"
int offset = { 0 }; // "B"
// https://www.w3.org/TR/css-syntax-3/#serializing-anb
String serialize() const
{
return String::formatted("{}n{:+}", step_size, offset);
// 1. If A is zero, return the serialization of B.
if (step_size == 0) {
return String::formatted("{}", offset);
}
// 2. Otherwise, let result initially be an empty string.
StringBuilder result;
// 3.
// - A is 1: Append "n" to result.
if (step_size == 1)
result.append("n");
// - A is -1: Append "-n" to result.
else if (step_size == -1)
result.append("-n");
// - A is non-zero: Serialize A and append it to result, then append "n" to result.
else if (step_size != 0)
result.appendff("{}n", step_size);
// 4.
// - B is greater than zero: Append "+" to result, then append the serialization of B to result.
if (offset > 0)
result.appendff("+{}", offset);
// - B is less than zero: Append the serialization of B to result.
if (offset < 0)
result.appendff("{}", offset);
// 5. Return result.
return result.to_string();
}
};