79 lines
2.8 KiB
JavaScript
79 lines
2.8 KiB
JavaScript
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/**
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* Limits the length of a string for display purposes, replacing the removed text
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* with the replacement entity specified
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*
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* @param {String} strToShorten - string to shorten.
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* @param {Number} maxLength - maximum length of string before appending the replacement entity.
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* @param {String} replacement - string to replace the removed text with, defaults to '…'
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* @param {Boolean} trimMiddle - if true, maxLength chars form the beginning and end will be
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* shown, and the middle of the string will be trimmed, ie '123…789' (maxLength = 3, delimiter = '…')
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* @example
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* const fullLength = '1234567890';
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* limitLength(fullLength, 3);
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* // returns '123…'
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* @example
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* const fullLength = '1234567890';
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* limitLength(fullLength, 3, '-', true);
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* // returns '123-890'
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* @returns {String} the shortened string
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*/
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export function limitLength (strToShorten, maxLength, replacement, trimMiddle){
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if(!strToShorten) return '';
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const fullStringLength = strToShorten.length;
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const ellips = replacement || '…';
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if(trimMiddle && fullStringLength > maxLength * 2){
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return [strToShorten.substring(0, maxLength), ellips, strToShorten.substring(fullStringLength - maxLength)].join('');
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}
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if(fullStringLength > maxLength){
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return strToShorten.substring(0, maxLength) + ellips;
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}
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return strToShorten;
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}
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/**
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* Limits the length of an address for display purposes, replacing the removed hex
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* chars with the replacement entity specified
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*
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* @param {String} address - address to shorten.
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* @param {Number} maxLength - maximum hex chars to show before appending the replacement.
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* @param {String} replacement - string to replace the removed hex chars with, defaults to '…'
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* @example
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* const fullLength = '0x3901F05c5e296E97c8Dc2ebEdCCa5F010f895552';
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* limitAddressLength(fullLength, 4);
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* // returns '0x3901…5552'
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* @example
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* const fullLength = '0x3901F05c5e296E97c8Dc2ebEdCCa5F010f895552';
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* limitAddressLength(fullLength, 3, '-');
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* // returns '0x390-552'
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* @returns {String} the shortened string
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*/
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export function limitAddressLength (address, maxLength, replacement){
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if(!address) return '';
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let prepend0x = false;
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if(address.startsWith('0x')){
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address = address.substring(2);
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prepend0x = true;
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}
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return `${prepend0x ? '0x': ''}${limitLength(address, maxLength, replacement, true)}`;
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}
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/**
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* Formats an ethereum amount using fixed-point notation.
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*
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* @param {any} eth - amount of ethereum to display.
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* @param {Number} decimals - number of decimal places to display.
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* @example
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* const eth = 123.12345678901234567890;
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* limitAddressLength(eth, 4);
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* // returns 123.1234
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* @returns {Number} the ethereum amount in fixed-point notation
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*/
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export function formatEth(eth, decimals){
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return Number.parseFloat(eth).toFixed(decimals);
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}
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