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'use strict'
// like String.prototype.search but returns the last index
function _searchLast (str, rgx) {
const matches = Array.from(str.matchAll(rgx))
return matches.length > 0 ? matches.slice(-1)[0].index : -1
}
function _interpolate (envValue, environment, config) {
// find the last unescaped dollar sign in the
// value so that we can evaluate it
const lastUnescapedDollarSignIndex = _searchLast(envValue, /(?!(?<=\\))\$/g)
// If we couldn't match any unescaped dollar sign
// let's return the string as is
if (lastUnescapedDollarSignIndex === -1) return envValue
// This is the right-most group of variables in the string
const rightMostGroup = envValue.slice(lastUnescapedDollarSignIndex)
/**
* This finds the inner most variable/group divided
* by variable name and default value (if present)
* (
* (?!(?<=\\))\$ // only match dollar signs that are not escaped
* {? // optional opening curly brace
* ([\w]+) // match the variable name
* (?::-([^}\\]*))? // match an optional default value
* }? // optional closing curly brace
* )
*/
const matchGroup = /((?!(?<=\\))\${?([\w]+)(?::-([^}\\]*))?}?)/
const match = rightMostGroup.match(matchGroup)
if (match != null) {
const [, group, variableName, defaultValue] = match
return _interpolate(
envValue.replace(
group,
environment[variableName] ||
defaultValue ||
config.parsed[variableName] ||
''
),
environment,
config
)
}
return envValue
}
function _resolveEscapeSequences (value) {
return value.replace(/\\\$/g, '$')
}
function expand (config) {
// if ignoring process.env, use a blank object
const environment = config.ignoreProcessEnv ? {} : process.env
for (const configKey in config.parsed) {
const value = Object.prototype.hasOwnProperty.call(environment, configKey)
? environment[configKey]
: config.parsed[configKey]
config.parsed[configKey] = _resolveEscapeSequences(
_interpolate(value, environment, config)
)
}
for (const processKey in config.parsed) {
environment[processKey] = config.parsed[processKey]
}
return config
}
module.exports.expand = expand