341 lines
9.3 KiB
JavaScript
341 lines
9.3 KiB
JavaScript
'use strict';
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const configurationError = require('./configurationError');
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const isSingleLineString = require('./isSingleLineString');
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const isWhitespace = require('./isWhitespace');
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const { assertFunction, isNullish } = require('./validateTypes');
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/**
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* @typedef {(message: string) => string} MessageFunction
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*/
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/**
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* @typedef {Object} Messages
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* @property {MessageFunction} [expectedBefore]
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* @property {MessageFunction} [rejectedBefore]
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* @property {MessageFunction} [expectedAfter]
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* @property {MessageFunction} [rejectedAfter]
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* @property {MessageFunction} [expectedBeforeSingleLine]
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* @property {MessageFunction} [rejectedBeforeSingleLine]
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* @property {MessageFunction} [expectedBeforeMultiLine]
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* @property {MessageFunction} [rejectedBeforeMultiLine]
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* @property {MessageFunction} [expectedAfterSingleLine]
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* @property {MessageFunction} [rejectedAfterSingleLine]
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* @property {MessageFunction} [expectedAfterMultiLine]
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* @property {MessageFunction} [rejectedAfterMultiLine]
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*/
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/**
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* @typedef {Object} WhitespaceCheckerArgs
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* @property {string} source - The source string
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* @property {number} index - The index of the character to check before
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* @property {(message: string) => void} err - If a problem is found, this callback
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* will be invoked with the relevant warning message.
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* Typically this callback will report() the problem.
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* @property {string} [errTarget] - If a problem is found, this string
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* will be sent to the relevant warning message.
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* @property {string} [lineCheckStr] - Single- and multi-line checkers
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* will use this string to determine whether they should proceed,
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* i.e. if this string is one line only, single-line checkers will check,
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* multi-line checkers will ignore.
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* If none is passed, they will use `source`.
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* @property {boolean} [onlyOneChar=false] - Only check *one* character before.
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* By default, "always-*" checks will look for the `targetWhitespace` one
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* before and then ensure there is no whitespace two before. This option
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* bypasses that second check.
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* @property {boolean} [allowIndentation=false] - Allow arbitrary indentation
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* between the `targetWhitespace` (almost definitely a newline) and the `index`.
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* With this option, the checker will see if a newline *begins* the whitespace before
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* the `index`.
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*/
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/**
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* @typedef {(args: WhitespaceCheckerArgs) => void} WhitespaceChecker
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*/
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/**
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* @typedef {{
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* before: WhitespaceChecker,
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* beforeAllowingIndentation: WhitespaceChecker,
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* after: WhitespaceChecker,
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* afterOneOnly: WhitespaceChecker,
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* }} WhitespaceCheckers
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*/
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/**
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* Create a whitespaceChecker, which exposes the following functions:
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* - `before()`
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* - `beforeAllowingIndentation()`
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* - `after()`
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* - `afterOneOnly()`
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*
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* @param {"space" | "newline"} targetWhitespace - This is a keyword instead
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* of the actual character (e.g. " ") in order to accommodate
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* different styles of newline ("\n" vs "\r\n")
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* @param {"always" | "never" | "always-single-line" | "always-multi-line" | "never-single-line" | "never-multi-line"} expectation
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* @param {Messages} messages - An object of message functions;
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* calling `before*()` or `after*()` and the `expectation` that is passed
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* determines which message functions are required
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*
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* @returns {WhitespaceCheckers} The checker, with its exposed checking functions
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*/
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module.exports = function whitespaceChecker(targetWhitespace, expectation, messages) {
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// Keep track of active arguments in order to avoid passing
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// too much stuff around, making signatures long and confusing.
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// This variable gets reset anytime a checking function is called.
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/** @type {WhitespaceCheckerArgs} */
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let activeArgs;
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/**
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* Check for whitespace *before* a character.
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* @type {WhitespaceChecker}
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*/
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function before({
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source,
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index,
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err,
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errTarget,
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lineCheckStr,
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onlyOneChar = false,
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allowIndentation = false,
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}) {
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activeArgs = {
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source,
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index,
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err,
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errTarget,
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onlyOneChar,
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allowIndentation,
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};
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switch (expectation) {
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case 'always':
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expectBefore();
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break;
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case 'never':
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rejectBefore();
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break;
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case 'always-single-line':
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if (!isSingleLineString(lineCheckStr || source)) {
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return;
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}
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expectBefore(messages.expectedBeforeSingleLine);
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break;
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case 'never-single-line':
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if (!isSingleLineString(lineCheckStr || source)) {
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return;
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}
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rejectBefore(messages.rejectedBeforeSingleLine);
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break;
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case 'always-multi-line':
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if (isSingleLineString(lineCheckStr || source)) {
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return;
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}
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expectBefore(messages.expectedBeforeMultiLine);
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break;
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case 'never-multi-line':
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if (isSingleLineString(lineCheckStr || source)) {
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return;
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}
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rejectBefore(messages.rejectedBeforeMultiLine);
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break;
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default:
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throw configurationError(`Unknown expectation "${expectation}"`);
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}
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}
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/**
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* Check for whitespace *after* a character.
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* @type {WhitespaceChecker}
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*/
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function after({ source, index, err, errTarget, lineCheckStr, onlyOneChar = false }) {
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activeArgs = { source, index, err, errTarget, onlyOneChar };
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switch (expectation) {
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case 'always':
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expectAfter();
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break;
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case 'never':
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rejectAfter();
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break;
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case 'always-single-line':
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if (!isSingleLineString(lineCheckStr || source)) {
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return;
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}
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expectAfter(messages.expectedAfterSingleLine);
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break;
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case 'never-single-line':
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if (!isSingleLineString(lineCheckStr || source)) {
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return;
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}
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rejectAfter(messages.rejectedAfterSingleLine);
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break;
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case 'always-multi-line':
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if (isSingleLineString(lineCheckStr || source)) {
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return;
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}
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expectAfter(messages.expectedAfterMultiLine);
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break;
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case 'never-multi-line':
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if (isSingleLineString(lineCheckStr || source)) {
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return;
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}
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rejectAfter(messages.rejectedAfterMultiLine);
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break;
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default:
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throw configurationError(`Unknown expectation "${expectation}"`);
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}
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}
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/**
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* @type {WhitespaceChecker}
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*/
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function beforeAllowingIndentation(obj) {
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before({ ...obj, allowIndentation: true });
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}
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function expectBefore(messageFunc = messages.expectedBefore) {
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if (activeArgs.allowIndentation) {
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expectBeforeAllowingIndentation(messageFunc);
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return;
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}
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const _activeArgs = activeArgs;
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const source = _activeArgs.source;
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const index = _activeArgs.index;
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const oneCharBefore = source[index - 1];
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const twoCharsBefore = source[index - 2];
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if (isNullish(oneCharBefore)) {
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return;
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}
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if (
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targetWhitespace === 'space' &&
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oneCharBefore === ' ' &&
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(activeArgs.onlyOneChar || isNullish(twoCharsBefore) || !isWhitespace(twoCharsBefore))
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) {
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return;
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}
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assertFunction(messageFunc);
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activeArgs.err(messageFunc(activeArgs.errTarget || source.charAt(index)));
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}
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function expectBeforeAllowingIndentation(messageFunc = messages.expectedBefore) {
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const _activeArgs2 = activeArgs;
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const source = _activeArgs2.source;
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const index = _activeArgs2.index;
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const err = _activeArgs2.err;
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const expectedChar = targetWhitespace === 'newline' ? '\n' : undefined;
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let i = index - 1;
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while (source[i] !== expectedChar) {
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if (source[i] === '\t' || source[i] === ' ') {
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i--;
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continue;
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}
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assertFunction(messageFunc);
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err(messageFunc(activeArgs.errTarget || source.charAt(index)));
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return;
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}
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}
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function rejectBefore(messageFunc = messages.rejectedBefore) {
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const _activeArgs3 = activeArgs;
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const source = _activeArgs3.source;
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const index = _activeArgs3.index;
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const oneCharBefore = source[index - 1];
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if (!isNullish(oneCharBefore) && isWhitespace(oneCharBefore)) {
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assertFunction(messageFunc);
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activeArgs.err(messageFunc(activeArgs.errTarget || source.charAt(index)));
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}
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}
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/**
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* @type {WhitespaceChecker}
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*/
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function afterOneOnly(obj) {
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after({ ...obj, onlyOneChar: true });
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}
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function expectAfter(messageFunc = messages.expectedAfter) {
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const _activeArgs4 = activeArgs;
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const source = _activeArgs4.source;
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const index = _activeArgs4.index;
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const oneCharAfter = source[index + 1];
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const twoCharsAfter = source[index + 2];
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const threeCharsAfter = source[index + 3];
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if (isNullish(oneCharAfter)) {
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return;
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}
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if (targetWhitespace === 'newline') {
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// If index is followed by a Windows CR-LF ...
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if (
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oneCharAfter === '\r' &&
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twoCharsAfter === '\n' &&
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(activeArgs.onlyOneChar || isNullish(threeCharsAfter) || !isWhitespace(threeCharsAfter))
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) {
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return;
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}
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// If index is followed by a Unix LF ...
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if (
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oneCharAfter === '\n' &&
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(activeArgs.onlyOneChar || isNullish(twoCharsAfter) || !isWhitespace(twoCharsAfter))
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) {
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return;
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}
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}
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if (
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targetWhitespace === 'space' &&
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oneCharAfter === ' ' &&
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(activeArgs.onlyOneChar || isNullish(twoCharsAfter) || !isWhitespace(twoCharsAfter))
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) {
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return;
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}
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assertFunction(messageFunc);
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activeArgs.err(messageFunc(activeArgs.errTarget || source.charAt(index)));
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}
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function rejectAfter(messageFunc = messages.rejectedAfter) {
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const _activeArgs5 = activeArgs;
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const source = _activeArgs5.source;
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const index = _activeArgs5.index;
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const oneCharAfter = source[index + 1];
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if (!isNullish(oneCharAfter) && isWhitespace(oneCharAfter)) {
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assertFunction(messageFunc);
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activeArgs.err(messageFunc(activeArgs.errTarget || source.charAt(index)));
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}
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}
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return {
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before,
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beforeAllowingIndentation,
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after,
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afterOneOnly,
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};
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};
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