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61 lines
1.8 KiB
61 lines
1.8 KiB
'use strict'
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function _interpolate (envValue, environment, config) {
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const matches = envValue.match(/(.?\${*[\w]*(?::-[\w/]*)?}*)/g) || []
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return matches.reduce(function (newEnv, match, index) {
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const parts = /(.?)\${*([\w]*(?::-[\w/]*)?)?}*/g.exec(match)
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if (!parts || parts.length === 0) {
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return newEnv
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}
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const prefix = parts[1]
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let value, replacePart
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if (prefix === '\\') {
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replacePart = parts[0]
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value = replacePart.replace('\\$', '$')
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} else {
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const keyParts = parts[2].split(':-')
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const key = keyParts[0]
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replacePart = parts[0].substring(prefix.length)
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// process.env value 'wins' over .env file's value
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value = Object.prototype.hasOwnProperty.call(environment, key)
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? environment[key]
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: (config.parsed[key] || keyParts[1] || '')
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// If the value is found, remove nested expansions.
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if (keyParts.length > 1 && value) {
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const replaceNested = matches[index + 1]
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matches[index + 1] = ''
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newEnv = newEnv.replace(replaceNested, '')
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}
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// Resolve recursive interpolations
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value = _interpolate(value, environment, config)
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}
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return newEnv.replace(replacePart, value)
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}, envValue)
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}
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function expand (config) {
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// if ignoring process.env, use a blank object
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const environment = config.ignoreProcessEnv ? {} : process.env
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for (const configKey in config.parsed) {
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const value = Object.prototype.hasOwnProperty.call(environment, configKey) ? environment[configKey] : config.parsed[configKey]
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config.parsed[configKey] = _interpolate(value, environment, config)
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}
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for (const processKey in config.parsed) {
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environment[processKey] = config.parsed[processKey]
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}
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return config
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}
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module.exports.expand = expand
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