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