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import { DataItem } from 'ethereum-types';
import * as _ from 'lodash';
/**
* Returns an array of DataItem's corresponding to the input signature.
* A signature can be in two forms: '<DataItem.type>' or '(<DataItem1.type>, <DataItem2.type>, ...)
* An example of the first form would be 'address' or 'uint256'
* An example of the second form would be '(address, uint256)'
* Signatures can also include a name field, for example: 'foo address' or '(foo address, bar uint256)'
* @param signature of input DataItems
* @return DataItems derived from input signature
*/
export function generateDataItemsFromSignature(signature: string): DataItem[] {
let trimmedSignature = signature;
if (signature.startsWith('(')) {
if (!signature.endsWith(')')) {
throw new Error(`Failed to generate data item. Must end with ')'`);
}
trimmedSignature = signature.substr(1, signature.length - 2);
}
trimmedSignature += ',';
let isCurrTokenArray = false;
let currTokenArrayModifier = '';
let isParsingArrayModifier = false;
let currToken = '';
let parenCount = 0;
let currTokenName = '';
const dataItems: DataItem[] = [];
for (const char of trimmedSignature) {
// Tokenize the type string while keeping track of parentheses.
switch (char) {
case '(':
parenCount += 1;
currToken += char;
break;
case ')':
parenCount -= 1;
currToken += char;
break;
case '[':
if (parenCount === 0) {
isParsingArrayModifier = true;
isCurrTokenArray = true;
currTokenArrayModifier += '[';
} else {
currToken += char;
}
break;
case ']':
if (parenCount === 0) {
isParsingArrayModifier = false;
currTokenArrayModifier += ']';
} else {
currToken += char;
}
break;
case ' ':
if (parenCount === 0) {
currTokenName = currToken;
currToken = '';
} else {
currToken += char;
}
break;
case ',':
if (parenCount === 0) {
// Generate new DataItem from token
const components = currToken.startsWith('(') ? generateDataItemsFromSignature(currToken) : [];
const isTuple = !_.isEmpty(components);
const dataItem: DataItem = { name: currTokenName, type: '' };
if (isTuple) {
dataItem.type = 'tuple';
dataItem.components = components;
} else {
dataItem.type = currToken;
}
if (isCurrTokenArray) {
dataItem.type += currTokenArrayModifier;
}
dataItems.push(dataItem);
// reset token state
currTokenName = '';
currToken = '';
isCurrTokenArray = false;
currTokenArrayModifier = '';
break;
} else {
currToken += char;
break;
}
default:
if (isParsingArrayModifier) {
currTokenArrayModifier += char;
} else {
currToken += char;
}
break;
}
}
return dataItems;
}
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