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https://github.com/denoland/std.git
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801 lines
20 KiB
TypeScript
801 lines
20 KiB
TypeScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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// This module is browser compatible.
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import { deepMerge } from "@std/collections/deep-merge";
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// ---------------------------
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// Interfaces and base classes
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// ---------------------------
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interface Success<T> {
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ok: true;
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body: T;
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}
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interface Failure {
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ok: false;
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}
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type ParseResult<T> = Success<T> | Failure;
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type ParserComponent<T = unknown> = (scanner: Scanner) => ParseResult<T>;
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type BlockParseResultBody = {
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type: "Block";
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value: Record<string, unknown>;
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} | {
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type: "Table";
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key: string[];
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value: Record<string, unknown>;
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} | {
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type: "TableArray";
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key: string[];
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value: Record<string, unknown>;
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};
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export class Scanner {
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#whitespace = /[ \t]/;
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#position = 0;
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#source: string;
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constructor(source: string) {
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this.#source = source;
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}
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/**
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* Get current character
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* @param index - relative index from current position
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*/
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char(index = 0) {
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return this.#source[this.#position + index] ?? "";
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}
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/**
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* Get sliced string
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* @param start - start position relative from current position
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* @param end - end position relative from current position
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*/
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slice(start: number, end: number): string {
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return this.#source.slice(this.#position + start, this.#position + end);
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}
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/**
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* Move position to next
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*/
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next(count?: number) {
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if (typeof count === "number") {
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for (let i = 0; i < count; i++) {
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this.#position++;
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}
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} else {
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this.#position++;
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}
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}
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/**
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* Move position until current char is not a whitespace, EOL, or comment.
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* @param options.inline - skip only whitespaces
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*/
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nextUntilChar(
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options: { inline?: boolean; comment?: boolean } = { comment: true },
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) {
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if (options.inline) {
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while (this.#whitespace.test(this.char()) && !this.eof()) {
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this.next();
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}
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} else {
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while (!this.eof()) {
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const char = this.char();
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if (this.#whitespace.test(char) || this.isCurrentCharEOL()) {
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this.next();
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} else if (options.comment && this.char() === "#") {
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// entering comment
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while (!this.isCurrentCharEOL() && !this.eof()) {
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this.next();
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}
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} else {
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break;
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}
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}
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}
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// Invalid if current char is other kinds of whitespace
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if (!this.isCurrentCharEOL() && /\s/.test(this.char())) {
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const escaped = "\\u" + this.char().charCodeAt(0).toString(16);
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throw new SyntaxError(`Contains invalid whitespaces: \`${escaped}\``);
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}
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}
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/**
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* Position reached EOF or not
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*/
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eof() {
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return this.position() >= this.#source.length;
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}
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/**
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* Get current position
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*/
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position() {
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return this.#position;
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}
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isCurrentCharEOL() {
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return this.char() === "\n" || this.slice(0, 2) === "\r\n";
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}
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}
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// -----------------------
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// Utilities
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// -----------------------
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function success<T>(body: T): Success<T> {
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return { ok: true, body };
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}
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function failure(): Failure {
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return { ok: false };
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}
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export function unflat(
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keys: string[],
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values: unknown = {},
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cObj?: unknown,
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): Record<string, unknown> {
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const out: Record<string, unknown> = {};
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if (keys.length === 0) {
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return cObj as Record<string, unknown>;
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}
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if (!cObj) cObj = values;
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const key: string | undefined = keys[keys.length - 1];
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if (typeof key === "string") out[key] = cObj;
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return unflat(keys.slice(0, -1), values, out);
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}
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export function deepAssignWithTable(target: Record<string, unknown>, table: {
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type: "Table" | "TableArray";
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key: string[];
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value: Record<string, unknown>;
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}) {
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if (table.key.length === 0 || table.key[0] == null) {
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throw new Error("Unexpected key length");
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}
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const value = target[table.key[0]];
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if (typeof value === "undefined") {
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Object.assign(
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target,
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unflat(
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table.key,
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table.type === "Table" ? table.value : [table.value],
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),
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);
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} else if (Array.isArray(value)) {
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if (table.type === "TableArray" && table.key.length === 1) {
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value.push(table.value);
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} else {
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const last = value[value.length - 1];
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deepAssignWithTable(last, {
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type: table.type,
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key: table.key.slice(1),
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value: table.value,
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});
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}
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} else if (typeof value === "object" && value !== null) {
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deepAssignWithTable(value as Record<string, unknown>, {
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type: table.type,
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key: table.key.slice(1),
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value: table.value,
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});
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} else {
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throw new Error("Unexpected assign");
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}
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}
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// ---------------------------------
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// Parser combinators and generators
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// ---------------------------------
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function or<T>(parsers: ParserComponent<T>[]): ParserComponent<T> {
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return (scanner: Scanner): ParseResult<T> => {
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for (const parse of parsers) {
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const result = parse(scanner);
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if (result.ok) return result;
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}
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return failure();
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};
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}
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function join<T>(
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parser: ParserComponent<T>,
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separator: string,
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): ParserComponent<T[]> {
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const Separator = character(separator);
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return (scanner: Scanner): ParseResult<T[]> => {
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const first = parser(scanner);
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if (!first.ok) return failure();
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const out: T[] = [first.body];
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while (!scanner.eof()) {
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if (!Separator(scanner).ok) break;
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const result = parser(scanner);
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if (!result.ok) {
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throw new SyntaxError(`Invalid token after "${separator}"`);
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}
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out.push(result.body);
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}
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return success(out);
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};
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}
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function kv<T>(
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keyParser: ParserComponent<string[]>,
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separator: string,
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valueParser: ParserComponent<T>,
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): ParserComponent<{ [key: string]: unknown }> {
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const Separator = character(separator);
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return (scanner: Scanner): ParseResult<{ [key: string]: unknown }> => {
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const key = keyParser(scanner);
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if (!key.ok) return failure();
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const sep = Separator(scanner);
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if (!sep.ok) {
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throw new SyntaxError(`key/value pair doesn't have "${separator}"`);
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}
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const value = valueParser(scanner);
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if (!value.ok) {
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throw new SyntaxError(
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`Value of key/value pair is invalid data format`,
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);
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}
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return success(unflat(key.body, value.body));
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};
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}
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function merge(
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parser: ParserComponent<unknown[]>,
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): ParserComponent<Record<string, unknown>> {
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return (scanner: Scanner): ParseResult<Record<string, unknown>> => {
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const result = parser(scanner);
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if (!result.ok) return failure();
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let body = {};
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for (const record of result.body) {
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if (typeof body === "object" && body !== null) {
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// deno-lint-ignore no-explicit-any
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body = deepMerge(body, record as Record<any, any>);
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}
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}
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return success(body);
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};
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}
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function repeat<T>(
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parser: ParserComponent<T>,
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): ParserComponent<T[]> {
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return (scanner: Scanner) => {
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const body: T[] = [];
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while (!scanner.eof()) {
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const result = parser(scanner);
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if (!result.ok) break;
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body.push(result.body);
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scanner.nextUntilChar();
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}
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if (body.length === 0) return failure();
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return success(body);
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};
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}
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function surround<T>(
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left: string,
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parser: ParserComponent<T>,
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right: string,
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): ParserComponent<T> {
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const Left = character(left);
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const Right = character(right);
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return (scanner: Scanner) => {
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if (!Left(scanner).ok) {
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return failure();
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}
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const result = parser(scanner);
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if (!result.ok) {
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throw new SyntaxError(`Invalid token after "${left}"`);
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}
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if (!Right(scanner).ok) {
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throw new SyntaxError(
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`Not closed by "${right}" after started with "${left}"`,
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);
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}
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return success(result.body);
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};
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}
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function character(str: string) {
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return (scanner: Scanner): ParseResult<void> => {
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scanner.nextUntilChar({ inline: true });
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if (scanner.slice(0, str.length) !== str) return failure();
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scanner.next(str.length);
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scanner.nextUntilChar({ inline: true });
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return success(undefined);
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};
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}
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// -----------------------
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// Parser components
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// -----------------------
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const BARE_KEY_REGEXP = /[A-Za-z0-9_-]/;
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const FLOAT_REGEXP = /[0-9_\.e+\-]/i;
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const END_OF_VALUE_REGEXP = /[ \t\r\n#,}\]]/;
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export function bareKey(scanner: Scanner): ParseResult<string> {
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scanner.nextUntilChar({ inline: true });
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if (!scanner.char() || !BARE_KEY_REGEXP.test(scanner.char())) {
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return failure();
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}
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const acc: string[] = [];
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while (scanner.char() && BARE_KEY_REGEXP.test(scanner.char())) {
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acc.push(scanner.char());
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scanner.next();
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}
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const key = acc.join("");
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return success(key);
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}
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function escapeSequence(scanner: Scanner): ParseResult<string> {
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if (scanner.char() !== "\\") return failure();
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scanner.next();
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// See https://toml.io/en/v1.0.0-rc.3#string
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switch (scanner.char()) {
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case "b":
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scanner.next();
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return success("\b");
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case "t":
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scanner.next();
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return success("\t");
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case "n":
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scanner.next();
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return success("\n");
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case "f":
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scanner.next();
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return success("\f");
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case "r":
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scanner.next();
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return success("\r");
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case "u":
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case "U": {
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// Unicode character
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const codePointLen = scanner.char() === "u" ? 4 : 6;
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const codePoint = parseInt(
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"0x" + scanner.slice(1, 1 + codePointLen),
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16,
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);
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const str = String.fromCodePoint(codePoint);
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scanner.next(codePointLen + 1);
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return success(str);
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}
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case '"':
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scanner.next();
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return success('"');
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case "\\":
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scanner.next();
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return success("\\");
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default:
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throw new SyntaxError(
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`Invalid escape sequence: \\${scanner.char()}`,
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);
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}
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}
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export function basicString(scanner: Scanner): ParseResult<string> {
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scanner.nextUntilChar({ inline: true });
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if (scanner.char() !== '"') return failure();
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scanner.next();
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const acc = [];
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while (scanner.char() !== '"' && !scanner.eof()) {
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if (scanner.char() === "\n") {
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throw new SyntaxError("Single-line string cannot contain EOL");
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}
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const escapedChar = escapeSequence(scanner);
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if (escapedChar.ok) {
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acc.push(escapedChar.body);
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} else {
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acc.push(scanner.char());
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scanner.next();
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}
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}
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if (scanner.eof()) {
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throw new SyntaxError(
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`Single-line string is not closed:\n${acc.join("")}`,
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);
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}
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scanner.next(); // skip last '""
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return success(acc.join(""));
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}
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export function literalString(scanner: Scanner): ParseResult<string> {
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scanner.nextUntilChar({ inline: true });
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if (scanner.char() !== "'") return failure();
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scanner.next();
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const acc: string[] = [];
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while (scanner.char() !== "'" && !scanner.eof()) {
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if (scanner.char() === "\n") {
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throw new SyntaxError("Single-line string cannot contain EOL");
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}
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acc.push(scanner.char());
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scanner.next();
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}
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if (scanner.eof()) {
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throw new SyntaxError(
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`Single-line string is not closed:\n${acc.join("")}`,
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);
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}
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scanner.next(); // skip last "'"
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return success(acc.join(""));
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}
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export function multilineBasicString(
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scanner: Scanner,
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): ParseResult<string> {
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scanner.nextUntilChar({ inline: true });
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if (scanner.slice(0, 3) !== '"""') return failure();
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scanner.next(3);
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if (scanner.char() === "\n") {
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// The first newline (LF) is trimmed
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scanner.next();
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} else if (scanner.slice(0, 2) === "\r\n") {
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// The first newline (CRLF) is trimmed
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scanner.next(2);
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}
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const acc: string[] = [];
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while (scanner.slice(0, 3) !== '"""' && !scanner.eof()) {
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// line ending backslash
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if (scanner.slice(0, 2) === "\\\n") {
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scanner.next();
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scanner.nextUntilChar({ comment: false });
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continue;
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} else if (scanner.slice(0, 3) === "\\\r\n") {
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scanner.next();
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scanner.nextUntilChar({ comment: false });
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continue;
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}
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const escapedChar = escapeSequence(scanner);
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if (escapedChar.ok) {
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acc.push(escapedChar.body);
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} else {
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acc.push(scanner.char());
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scanner.next();
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}
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}
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if (scanner.eof()) {
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throw new SyntaxError(
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`Multi-line string is not closed:\n${acc.join("")}`,
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);
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}
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// if ends with 4 `"`, push the fist `"` to string
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if (scanner.char(3) === '"') {
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acc.push('"');
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scanner.next();
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}
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scanner.next(3); // skip last '""""
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return success(acc.join(""));
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}
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export function multilineLiteralString(
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scanner: Scanner,
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): ParseResult<string> {
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scanner.nextUntilChar({ inline: true });
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if (scanner.slice(0, 3) !== "'''") return failure();
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scanner.next(3);
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if (scanner.char() === "\n") {
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// The first newline (LF) is trimmed
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scanner.next();
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} else if (scanner.slice(0, 2) === "\r\n") {
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// The first newline (CRLF) is trimmed
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scanner.next(2);
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}
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const acc: string[] = [];
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while (scanner.slice(0, 3) !== "'''" && !scanner.eof()) {
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acc.push(scanner.char());
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scanner.next();
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}
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if (scanner.eof()) {
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throw new SyntaxError(
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`Multi-line string is not closed:\n${acc.join("")}`,
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);
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}
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// if ends with 4 `'`, push the fist `'` to string
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if (scanner.char(3) === "'") {
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acc.push("'");
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scanner.next();
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}
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scanner.next(3); // skip last "'''"
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return success(acc.join(""));
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}
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const symbolPairs: [string, unknown][] = [
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["true", true],
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["false", false],
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["inf", Infinity],
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["+inf", Infinity],
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["-inf", -Infinity],
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["nan", NaN],
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["+nan", NaN],
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["-nan", NaN],
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];
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export function symbols(scanner: Scanner): ParseResult<unknown> {
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scanner.nextUntilChar({ inline: true });
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const found = symbolPairs.find(([str]) =>
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scanner.slice(0, str.length) === str
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);
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if (!found) return failure();
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const [str, value] = found;
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scanner.next(str.length);
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return success(value);
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}
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export const dottedKey = join(or([bareKey, basicString, literalString]), ".");
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export function integer(scanner: Scanner): ParseResult<number | string> {
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scanner.nextUntilChar({ inline: true });
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// If binary / octal / hex
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const first2 = scanner.slice(0, 2);
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if (first2.length === 2 && /0(?:x|o|b)/i.test(first2)) {
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scanner.next(2);
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const acc = [first2];
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while (/[0-9a-f_]/i.test(scanner.char()) && !scanner.eof()) {
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acc.push(scanner.char());
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scanner.next();
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}
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if (acc.length === 1) return failure();
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return success(acc.join(""));
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}
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const acc = [];
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if (/[+-]/.test(scanner.char())) {
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acc.push(scanner.char());
|
|
scanner.next();
|
|
}
|
|
while (/[0-9_]/.test(scanner.char()) && !scanner.eof()) {
|
|
acc.push(scanner.char());
|
|
scanner.next();
|
|
}
|
|
|
|
if (acc.length === 0 || (acc.length === 1 && /[+-]/.test(acc[0]!))) {
|
|
return failure();
|
|
}
|
|
|
|
const int = parseInt(acc.filter((char) => char !== "_").join(""));
|
|
return success(int);
|
|
}
|
|
|
|
export function float(scanner: Scanner): ParseResult<number> {
|
|
scanner.nextUntilChar({ inline: true });
|
|
|
|
// lookahead validation is needed for integer value is similar to float
|
|
let position = 0;
|
|
while (
|
|
scanner.char(position) &&
|
|
!END_OF_VALUE_REGEXP.test(scanner.char(position))
|
|
) {
|
|
if (!FLOAT_REGEXP.test(scanner.char(position))) return failure();
|
|
position++;
|
|
}
|
|
|
|
const acc = [];
|
|
if (/[+-]/.test(scanner.char())) {
|
|
acc.push(scanner.char());
|
|
scanner.next();
|
|
}
|
|
while (FLOAT_REGEXP.test(scanner.char()) && !scanner.eof()) {
|
|
acc.push(scanner.char());
|
|
scanner.next();
|
|
}
|
|
|
|
if (acc.length === 0) return failure();
|
|
const float = parseFloat(acc.filter((char) => char !== "_").join(""));
|
|
if (isNaN(float)) return failure();
|
|
|
|
return success(float);
|
|
}
|
|
|
|
export function dateTime(scanner: Scanner): ParseResult<Date> {
|
|
scanner.nextUntilChar({ inline: true });
|
|
|
|
let dateStr = scanner.slice(0, 10);
|
|
// example: 1979-05-27
|
|
if (!/^\d{4}-\d{2}-\d{2}/.test(dateStr)) return failure();
|
|
scanner.next(10);
|
|
|
|
const acc = [];
|
|
// example: 1979-05-27T00:32:00Z
|
|
while (/[ 0-9TZ.:-]/.test(scanner.char()) && !scanner.eof()) {
|
|
acc.push(scanner.char());
|
|
scanner.next();
|
|
}
|
|
dateStr += acc.join("");
|
|
const date = new Date(dateStr.trim());
|
|
// invalid date
|
|
if (isNaN(date.getTime())) {
|
|
throw new SyntaxError(`Invalid date string "${dateStr}"`);
|
|
}
|
|
|
|
return success(date);
|
|
}
|
|
|
|
export function localTime(scanner: Scanner): ParseResult<string> {
|
|
scanner.nextUntilChar({ inline: true });
|
|
|
|
let timeStr = scanner.slice(0, 8);
|
|
if (!/^(\d{2}):(\d{2}):(\d{2})/.test(timeStr)) return failure();
|
|
scanner.next(8);
|
|
|
|
const acc = [];
|
|
if (scanner.char() !== ".") return success(timeStr);
|
|
acc.push(scanner.char());
|
|
scanner.next();
|
|
|
|
while (/[0-9]/.test(scanner.char()) && !scanner.eof()) {
|
|
acc.push(scanner.char());
|
|
scanner.next();
|
|
}
|
|
timeStr += acc.join("");
|
|
return success(timeStr);
|
|
}
|
|
|
|
export function arrayValue(scanner: Scanner): ParseResult<unknown[]> {
|
|
scanner.nextUntilChar({ inline: true });
|
|
|
|
if (scanner.char() !== "[") return failure();
|
|
scanner.next();
|
|
|
|
const array: unknown[] = [];
|
|
while (!scanner.eof()) {
|
|
scanner.nextUntilChar();
|
|
const result = value(scanner);
|
|
if (!result.ok) break;
|
|
array.push(result.body);
|
|
scanner.nextUntilChar({ inline: true });
|
|
// may have a next item, but trailing comma is allowed at array
|
|
if (scanner.char() !== ",") break;
|
|
scanner.next();
|
|
}
|
|
scanner.nextUntilChar();
|
|
|
|
if (scanner.char() !== "]") throw new SyntaxError("Array is not closed");
|
|
scanner.next();
|
|
|
|
return success(array);
|
|
}
|
|
|
|
export function inlineTable(
|
|
scanner: Scanner,
|
|
): ParseResult<Record<string, unknown>> {
|
|
scanner.nextUntilChar();
|
|
if (scanner.char(1) === "}") {
|
|
scanner.next(2);
|
|
return success({});
|
|
}
|
|
const pairs = surround(
|
|
"{",
|
|
join(pair, ","),
|
|
"}",
|
|
)(scanner);
|
|
if (!pairs.ok) return failure();
|
|
let table = {};
|
|
for (const pair of pairs.body) {
|
|
table = deepMerge(table, pair);
|
|
}
|
|
return success(table);
|
|
}
|
|
|
|
export const value = or([
|
|
multilineBasicString,
|
|
multilineLiteralString,
|
|
basicString,
|
|
literalString,
|
|
symbols,
|
|
dateTime,
|
|
localTime,
|
|
float,
|
|
integer,
|
|
arrayValue,
|
|
inlineTable,
|
|
]);
|
|
|
|
export const pair = kv(dottedKey, "=", value);
|
|
|
|
export function block(
|
|
scanner: Scanner,
|
|
): ParseResult<BlockParseResultBody> {
|
|
scanner.nextUntilChar();
|
|
const result = merge(repeat(pair))(scanner);
|
|
if (result.ok) return success({ type: "Block", value: result.body });
|
|
return failure();
|
|
}
|
|
|
|
export const tableHeader = surround("[", dottedKey, "]");
|
|
|
|
export function table(scanner: Scanner): ParseResult<BlockParseResultBody> {
|
|
scanner.nextUntilChar();
|
|
const header = tableHeader(scanner);
|
|
if (!header.ok) return failure();
|
|
scanner.nextUntilChar();
|
|
const b = block(scanner);
|
|
return success({
|
|
type: "Table",
|
|
key: header.body,
|
|
value: b.ok ? b.body.value : {},
|
|
});
|
|
}
|
|
|
|
export const tableArrayHeader = surround("[[", dottedKey, "]]");
|
|
|
|
export function tableArray(
|
|
scanner: Scanner,
|
|
): ParseResult<BlockParseResultBody> {
|
|
scanner.nextUntilChar();
|
|
const header = tableArrayHeader(scanner);
|
|
if (!header.ok) return failure();
|
|
scanner.nextUntilChar();
|
|
const b = block(scanner);
|
|
return success({
|
|
type: "TableArray",
|
|
key: header.body,
|
|
value: b.ok ? b.body.value : {},
|
|
});
|
|
}
|
|
|
|
export function toml(
|
|
scanner: Scanner,
|
|
): ParseResult<Record<string, unknown>> {
|
|
const blocks = repeat(or([block, tableArray, table]))(scanner);
|
|
if (!blocks.ok) return failure();
|
|
let body = {};
|
|
for (const block of blocks.body) {
|
|
switch (block.type) {
|
|
case "Block": {
|
|
body = deepMerge(body, block.value);
|
|
break;
|
|
}
|
|
case "Table": {
|
|
deepAssignWithTable(body, block);
|
|
break;
|
|
}
|
|
case "TableArray": {
|
|
deepAssignWithTable(body, block);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return success(body);
|
|
}
|
|
|
|
export function parserFactory<T>(parser: ParserComponent<T>) {
|
|
return (tomlString: string): T => {
|
|
const scanner = new Scanner(tomlString);
|
|
|
|
let parsed: ParseResult<T> | null = null;
|
|
let err: Error | null = null;
|
|
try {
|
|
parsed = parser(scanner);
|
|
} catch (e) {
|
|
err = e instanceof Error ? e : new Error("[non-error thrown]");
|
|
}
|
|
|
|
if (err || !parsed || !parsed.ok || !scanner.eof()) {
|
|
const position = scanner.position();
|
|
const subStr = tomlString.slice(0, position);
|
|
const lines = subStr.split("\n");
|
|
const row = lines.length;
|
|
const column = (() => {
|
|
let count = subStr.length;
|
|
for (const line of lines) {
|
|
if (count <= line.length) break;
|
|
count -= line.length + 1;
|
|
}
|
|
return count;
|
|
})();
|
|
const message = `Parse error on line ${row}, column ${column}: ${
|
|
err ? err.message : `Unexpected character: "${scanner.char()}"`
|
|
}`;
|
|
throw new SyntaxError(message);
|
|
}
|
|
return parsed.body;
|
|
};
|
|
}
|