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