WIP
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Louis Lam
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/*
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* Original Source: https://github.com/inventage/envsubst/blob/main/src/utils.js
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* MIT License
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* Copyright (c) 2021 Inventage AG
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*
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* Copy this file, because
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*/
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import escapeStringRegexp from "escape-string-regexp";
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import { LooseObject } from "./util-common";
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const toLowerKeys = (object : LooseObject) => {
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return Object.keys(object).reduce((accumulator : LooseObject, key) => {
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accumulator[key.toLowerCase()] = object[key];
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return accumulator;
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}, {});
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};
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/**
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* Regex pattern with an optional prefix.
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*
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* @see https://regex101.com/r/M3dVAW/1
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* @param prefix
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* @returns {string}
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*/
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const variableRegexPattern = (prefix = ""): string => {
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return `\\\${(${prefix ? escapeStringRegexp(prefix) : ""}\\w+)(:-([^}]*))?}`;
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};
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/**
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* Regex pattern that wraps the variable regex pattern with a window variable statement:
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*
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* window['${VAR}'] or window["${VAR}"]
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*
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* @see https://regex101.com/r/ND057d/1
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* @param prefix
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* @returns {string}
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*/
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const windowVariableRegexPattern = (prefix = ""): string => {
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return `(window\\[['"]{1})?${variableRegexPattern(prefix)}(['"]{1}\\])?`;
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};
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/**
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* Replaces all variable placeholders in the given string with either variable values
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* found in the variables parameter OR with the given default in the variable string.
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*
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* @param {string} string
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* @param {object} variables
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* @param {string} prefix
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* @param {boolean} trimWindow
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* @param {boolean} ignoreCase
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* @returns {Promise<unknown[]>}
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*/
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const replaceVariables = (string: string, variables: object = {}, prefix: string = "", trimWindow: boolean = false, ignoreCase: boolean = false): Promise<unknown[]> =>
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new Promise(resolve => {
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resolve(replaceVariablesSync(string, variables, prefix, trimWindow, ignoreCase));
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});
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/**
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* Replaces all variable placeholders in the given string with either variable values
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* found in the variables parameter OR with the given default in the variable string.
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*
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* @param {string} string
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* @param {object} variables
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* @param {string} prefix
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* @param {boolean} trimWindow
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* @param {boolean} ignoreCase
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* @returns {unknown[]}
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*/
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const replaceVariablesSync = (string : string, variables: LooseObject = {}, prefix: string = "", trimWindow: boolean = false, ignoreCase: boolean = false): unknown[] => {
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const regex = new RegExp(trimWindow ? windowVariableRegexPattern(prefix) : variableRegexPattern(prefix), ignoreCase ? "gmi" : "gm");
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const matches = [ ...string.matchAll(regex) ];
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const lowercaseVariables = toLowerKeys(variables);
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let replaced = string;
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const replacements : LooseObject[] = [];
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for (const match of matches) {
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if (trimWindow) {
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const [ original, windowStart, name, , fallback, windowEnd ] = match;
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// Bail if the match does not contain `^window[`
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if (!windowStart) {
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continue;
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}
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const valueStartQuote = windowStart.replace("window[", "");
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const valueEndQuote = windowEnd.replace("]", "");
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const withoutWindow = original.replace(windowStart, "").replace(windowEnd, "");
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let value;
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if (ignoreCase) {
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value = Object.hasOwnProperty.call(lowercaseVariables || {}, name.toLowerCase()) ? lowercaseVariables[name.toLowerCase()] : fallback;
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} else {
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value = Object.hasOwnProperty.call(variables || {}, name) ? variables[name] : fallback;
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}
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if (value !== undefined) {
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const quotedValue = `${valueStartQuote}${value}${valueEndQuote}`;
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const replacement = replacements.find(r => r.from === original && r.to === quotedValue);
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if (replacement) {
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replacement.count = replacement.count + 1;
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} else {
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replacements.push({ from: original,
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to: quotedValue,
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count: 1 });
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}
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replaced = replaced.split(original).join(withoutWindow.split(withoutWindow).join(quotedValue));
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}
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} else {
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const [ original, name, , fallback ] = match;
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let value : string;
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if (ignoreCase) {
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value = Object.hasOwnProperty.call(lowercaseVariables || {}, name.toLowerCase()) ? lowercaseVariables[name.toLowerCase()] : fallback;
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} else {
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value = Object.hasOwnProperty.call(variables || {}, name) ? variables[name] : fallback;
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}
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if (value !== undefined) {
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const replacement = replacements.find(r => r.from === original && r.to === value);
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if (replacement) {
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replacement.count = replacement.count + 1;
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} else {
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replacements.push({ from: original,
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to: value,
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count: 1 });
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}
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replaced = replaced.split(original).join(value);
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}
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}
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}
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return [ replaced, replacements ];
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};
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export { variableRegexPattern, replaceVariables, replaceVariablesSync };
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