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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,48 @@ | ||
| import { Abi, AbiFunction, AbiParameter } from "viem"; | ||
|
|
||
| /** | ||
| * Gets the function signature from an ABI for a given method name | ||
| * @param abi - The contract ABI | ||
| * @param methodName - The name of the method to get the signature for | ||
| * @param overloadIndex - Optional index for overloaded functions (0-based) | ||
| * @returns The function signature in standard format (e.g. "methodName(uint256,address)") | ||
| * @throws Error if method not found or if overloadIndex is required but not provided | ||
| */ | ||
| export function getFunctionSignature(abi: Abi, methodName: string, overloadIndex?: number): string { | ||
| const functions = abi.filter( | ||
| (x): x is AbiFunction => x.type === "function" && x.name === methodName, | ||
| ); | ||
|
|
||
| if (functions.length === 0) { | ||
| throw new Error(`Method ${methodName} not found in ABI.`); | ||
| } | ||
|
|
||
| if (functions.length > 1 && overloadIndex === undefined) { | ||
| throw new Error( | ||
| `Method ${methodName} has ${functions.length} overloads. Please specify overloadIndex (0-${ | ||
| functions.length - 1 | ||
| }).`, | ||
| ); | ||
| } | ||
|
|
||
| const func = functions[overloadIndex || 0]; | ||
|
|
||
| const getTypeString = ( | ||
| input: AbiParameter & { components?: readonly AbiParameter[] }, | ||
| ): string => { | ||
| if (input.type.startsWith("tuple")) { | ||
| const components = input.components | ||
| ?.map((comp: AbiParameter) => | ||
| getTypeString(comp as AbiParameter & { components?: AbiParameter[] }), | ||
| ) | ||
| .join(","); | ||
| return `(${components})`; | ||
| } | ||
| return input.type; | ||
| }; | ||
|
|
||
| const inputs = func.inputs | ||
| .map((input) => getTypeString(input as AbiParameter & { components?: readonly AbiParameter[] })) | ||
| .join(","); | ||
| return `${methodName}(${inputs})`; | ||
| } |
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