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LibWeb: Make an+b pattern selector serialization spec compliant
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1 changed files with 30 additions and 1 deletions
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@ -44,9 +44,38 @@ public:
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int step_size { 0 }; // "A"
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int offset = { 0 }; // "B"
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// https://www.w3.org/TR/css-syntax-3/#serializing-anb
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String serialize() const
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{
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return String::formatted("{}n{:+}", step_size, offset);
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// 1. If A is zero, return the serialization of B.
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if (step_size == 0) {
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return String::formatted("{}", offset);
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}
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// 2. Otherwise, let result initially be an empty string.
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StringBuilder result;
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// 3.
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// - A is 1: Append "n" to result.
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if (step_size == 1)
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result.append("n");
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// - A is -1: Append "-n" to result.
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else if (step_size == -1)
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result.append("-n");
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// - A is non-zero: Serialize A and append it to result, then append "n" to result.
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else if (step_size != 0)
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result.appendff("{}n", step_size);
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// 4.
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// - B is greater than zero: Append "+" to result, then append the serialization of B to result.
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if (offset > 0)
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result.appendff("+{}", offset);
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// - B is less than zero: Append the serialization of B to result.
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if (offset < 0)
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result.appendff("{}", offset);
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// 5. Return result.
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return result.to_string();
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}
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};
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