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/*
This file is part of GNU Taler
(C) 2020 Taler Systems S.A.
GNU Taler is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* Utilities to handle Taler-style configuration files.
*
* @author Florian Dold <dold@taler.net>
*/
/**
* Imports
*/
import { AmountJson } from "./amounts";
import * as Amounts from "./amounts";
export class ConfigError extends Error {
constructor(message: string) {
super();
Object.setPrototypeOf(this, ConfigError.prototype);
this.name = "ConfigError";
this.message = message;
}
}
type OptionMap = { [optionName: string]: string };
type SectionMap = { [sectionName: string]: OptionMap };
export class ConfigValue<T> {
constructor(
private sectionName: string,
private optionName: string,
private val: string | undefined,
private converter: (x: string) => T,
) {}
required(): T {
if (!this.val) {
throw new ConfigError(
`required option [${this.sectionName}]/${this.optionName} not found`,
);
}
return this.converter(this.val);
}
}
export class Configuration {
private sectionMap: SectionMap = {};
loadFromString(s: string): void {
const reComment = /^\s*#.*$/;
const reSection = /^\s*\[\s*([^\]]*)\s*\]\s*$/;
const reParam = /^\s*([^=]+?)\s*=\s*(.*?)\s*$/;
const reEmptyLine = /^\s*$/;
let currentSection: string | undefined = undefined;
const lines = s.split("\n");
for (const line of lines) {
console.log("parsing line", JSON.stringify(line));
if (reEmptyLine.test(line)) {
continue;
}
if (reComment.test(line)) {
continue;
}
const secMatch = line.match(reSection);
if (secMatch) {
currentSection = secMatch[1];
console.log("setting section to", currentSection);
continue;
}
if (currentSection === undefined) {
throw Error("invalid configuration, expected section header");
}
const paramMatch = line.match(reParam);
if (paramMatch) {
const optName = paramMatch[1];
let val = paramMatch[2];
if (val.startsWith('"') && val.endsWith('"')) {
val = val.slice(1, val.length - 1);
}
const sec = this.sectionMap[currentSection] ?? {};
this.sectionMap[currentSection] = Object.assign(sec, {
[optName]: val,
});
continue;
}
throw Error(
"invalid configuration, expected section header or option assignment",
);
}
console.log("parsed config", JSON.stringify(this.sectionMap, undefined, 2));
}
getString(section: string, option: string): ConfigValue<string> {
const val = (this.sectionMap[section] ?? {})[option];
return new ConfigValue(section, option, val, (x) => x);
}
getAmount(section: string, option: string): ConfigValue<AmountJson> {
const val = (this.sectionMap[section] ?? {})[option];
return new ConfigValue(section, option, val, (x) =>
Amounts.parseOrThrow(x),
);
}
}
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