52 lines
1.8 KiB
JavaScript
52 lines
1.8 KiB
JavaScript
/**
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* Extracts info about the server reference for the given server reference ID by
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* parsing the first byte of the hex-encoded ID.
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*
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* ```
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* Bit positions: [7] [6] [5] [4] [3] [2] [1] [0]
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* Bits: typeBit argMask restArgs
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* ```
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*
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* If the `typeBit` is `1` the server reference represents a `"use cache"`
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* function, otherwise a server action.
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*
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* The `argMask` encodes whether the function uses the argument at the
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* respective position.
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*
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* The `restArgs` bit indicates whether the function uses a rest parameter. It's
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* also set to 1 if the function has more than 6 args.
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*
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* @param id hex-encoded server reference ID
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*/ export function extractInfoFromServerReferenceId(id) {
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const infoByte = parseInt(id.slice(0, 2), 16);
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const typeBit = infoByte >> 7 & 0x1;
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const argMask = infoByte >> 1 & 0x3f;
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const restArgs = infoByte & 0x1;
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const usedArgs = Array(6);
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for(let index = 0; index < 6; index++){
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const bitPosition = 5 - index;
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const bit = argMask >> bitPosition & 0x1;
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usedArgs[index] = bit === 1;
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}
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return {
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type: typeBit === 1 ? 'use-cache' : 'server-action',
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usedArgs: usedArgs,
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hasRestArgs: restArgs === 1
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};
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}
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/**
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* Creates a sparse array containing only the used arguments based on the
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* provided action info.
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*/ export function omitUnusedArgs(args, info) {
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const filteredArgs = new Array(args.length);
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for(let index = 0; index < args.length; index++){
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if (index < 6 && info.usedArgs[index] || // This assumes that the server reference info byte has the restArgs bit
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// set to 1 if there are more than 6 args.
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index >= 6 && info.hasRestArgs) {
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filteredArgs[index] = args[index];
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}
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}
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return filteredArgs;
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}
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//# sourceMappingURL=server-reference-info.js.map
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