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https://github.com/bigchaindb/js-bigchaindb-driver.git
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100 lines
3.8 KiB
JavaScript
100 lines
3.8 KiB
JavaScript
// Copyright BigchainDB GmbH and BigchainDB contributors
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// SPDX-License-Identifier: (Apache-2.0 AND CC-BY-4.0)
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// Code is Apache-2.0 and docs are CC-BY-4.0
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import { sprintf } from 'sprintf-js'
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// Regexes taken from or inspired by sprintf-js
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const Regex = {
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TEMPLATE_LITERAL: /\${([^)]+?)}/g,
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KEY: /^([a-z_][a-z_\d]*)/i,
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KEY_ACCESS: /^\.([a-z_][a-z_\d]*)/i,
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INDEX_ACCESS: /^\[(\d+)\]/
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}
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/**
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* imported from https://github.com/bigchaindb/js-utility-belt/
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* @private
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* Formats strings similarly to C's sprintf, with the addition of '${...}' formats.
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*
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* Makes a first pass replacing '${...}' formats before passing the expanded string and other
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* arguments to sprintf-js. For more information on what sprintf can do, see
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* https://github.com/alexei/sprintf.js.
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*
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* Examples:
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* formatText('Hi there ${dimi}!', { dimi: 'Dimi' })
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* => 'Hi there Dimi!'
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*
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* formatText('${database} is %(status)s', { database: 'BigchainDB', status: 'big' })
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* => 'BigchainDB is big'
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*
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* Like sprintf-js, string interpolation for keywords and indexes is supported too:
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* formatText('Berlin is best known for its ${berlin.topKnownFor[0].name}', {
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* berlin: {
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* topKnownFor: [{
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* name: 'Currywurst'
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* }, ...
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* ]
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* }
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* })
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* => 'Berlin is best known for its Currywurst'
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*/
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export default function formatText(s, ...argv) {
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let expandedFormatStr = s
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// Try to replace formats of the form '${...}' if named replacement fields are used
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if (s && argv.length === 1 && typeof argv[0] === 'object') {
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const templateSpecObj = argv[0]
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expandedFormatStr = s.replace(Regex.TEMPLATE_LITERAL, (match, replacement) => {
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let interpolationLeft = replacement
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/**
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* @private
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* Interpolation algorithm inspired by sprintf-js.
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*
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* Goes through the replacement string getting the left-most key or index to interpolate
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* on each pass. `value` at each step holds the last interpolation result, `curMatch` is
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* the current property match, and `interpolationLeft` is the portion of the replacement
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* string still to be interpolated.
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*
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* It's useful to note that RegExp.exec() returns with an array holding:
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* [0]: Full string matched
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* [1+]: Matching groups
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*
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* And that in the regexes defined, the first matching group always corresponds to the
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* property matched.
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*/
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let value
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let curMatch = Regex.KEY.exec(interpolationLeft)
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if (curMatch !== null) {
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value = templateSpecObj[curMatch[1]]
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// Assigning in the conditionals here makes the code less bloated
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/* eslint-disable no-cond-assign */
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while ((interpolationLeft = interpolationLeft.substring(curMatch[0].length)) &&
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value != null) {
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if ((curMatch = Regex.KEY_ACCESS.exec(interpolationLeft))) {
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value = value[curMatch[1]]
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} else if ((curMatch = Regex.INDEX_ACCESS.exec(interpolationLeft))) {
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value = value[curMatch[1]]
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} else {
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break
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}
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}
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/* eslint-enable no-cond-assign */
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}
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// If there's anything left to interpolate by the end then we've failed to interpolate
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// the entire replacement string.
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if (interpolationLeft.length) {
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throw new SyntaxError(`[formatText] failed to parse named argument key: ${replacement}`)
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}
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return value
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})
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}
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return sprintf(expandedFormatStr, ...argv)
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}
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