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- 'use strict';
- const configurationError = require('./configurationError');
- const isSingleLineString = require('./isSingleLineString');
- const isWhitespace = require('./isWhitespace');
- const { assertFunction, isNullish } = require('./validateTypes');
- module.exports = function whitespaceChecker(targetWhitespace, expectation, messages) {
-
-
-
-
- let activeArgs;
-
- function before({
- source,
- index,
- err,
- errTarget,
- lineCheckStr,
- onlyOneChar = false,
- allowIndentation = false,
- }) {
- activeArgs = {
- source,
- index,
- err,
- errTarget,
- onlyOneChar,
- allowIndentation,
- };
- switch (expectation) {
- case 'always':
- expectBefore();
- break;
- case 'never':
- rejectBefore();
- break;
- case 'always-single-line':
- if (!isSingleLineString(lineCheckStr || source)) {
- return;
- }
- expectBefore(messages.expectedBeforeSingleLine);
- break;
- case 'never-single-line':
- if (!isSingleLineString(lineCheckStr || source)) {
- return;
- }
- rejectBefore(messages.rejectedBeforeSingleLine);
- break;
- case 'always-multi-line':
- if (isSingleLineString(lineCheckStr || source)) {
- return;
- }
- expectBefore(messages.expectedBeforeMultiLine);
- break;
- case 'never-multi-line':
- if (isSingleLineString(lineCheckStr || source)) {
- return;
- }
- rejectBefore(messages.rejectedBeforeMultiLine);
- break;
- default:
- throw configurationError(`Unknown expectation "${expectation}"`);
- }
- }
-
- function after({ source, index, err, errTarget, lineCheckStr, onlyOneChar = false }) {
- activeArgs = { source, index, err, errTarget, onlyOneChar };
- switch (expectation) {
- case 'always':
- expectAfter();
- break;
- case 'never':
- rejectAfter();
- break;
- case 'always-single-line':
- if (!isSingleLineString(lineCheckStr || source)) {
- return;
- }
- expectAfter(messages.expectedAfterSingleLine);
- break;
- case 'never-single-line':
- if (!isSingleLineString(lineCheckStr || source)) {
- return;
- }
- rejectAfter(messages.rejectedAfterSingleLine);
- break;
- case 'always-multi-line':
- if (isSingleLineString(lineCheckStr || source)) {
- return;
- }
- expectAfter(messages.expectedAfterMultiLine);
- break;
- case 'never-multi-line':
- if (isSingleLineString(lineCheckStr || source)) {
- return;
- }
- rejectAfter(messages.rejectedAfterMultiLine);
- break;
- default:
- throw configurationError(`Unknown expectation "${expectation}"`);
- }
- }
-
- function beforeAllowingIndentation(obj) {
- before({ ...obj, allowIndentation: true });
- }
- function expectBefore(messageFunc = messages.expectedBefore) {
- if (activeArgs.allowIndentation) {
- expectBeforeAllowingIndentation(messageFunc);
- return;
- }
- const _activeArgs = activeArgs;
- const source = _activeArgs.source;
- const index = _activeArgs.index;
- const oneCharBefore = source[index - 1];
- const twoCharsBefore = source[index - 2];
- if (isNullish(oneCharBefore)) {
- return;
- }
- if (
- targetWhitespace === 'space' &&
- oneCharBefore === ' ' &&
- (activeArgs.onlyOneChar || isNullish(twoCharsBefore) || !isWhitespace(twoCharsBefore))
- ) {
- return;
- }
- assertFunction(messageFunc);
- activeArgs.err(messageFunc(activeArgs.errTarget || source.charAt(index)));
- }
- function expectBeforeAllowingIndentation(messageFunc = messages.expectedBefore) {
- const _activeArgs2 = activeArgs;
- const source = _activeArgs2.source;
- const index = _activeArgs2.index;
- const err = _activeArgs2.err;
- const expectedChar = targetWhitespace === 'newline' ? '\n' : undefined;
- let i = index - 1;
- while (source[i] !== expectedChar) {
- if (source[i] === '\t' || source[i] === ' ') {
- i--;
- continue;
- }
- assertFunction(messageFunc);
- err(messageFunc(activeArgs.errTarget || source.charAt(index)));
- return;
- }
- }
- function rejectBefore(messageFunc = messages.rejectedBefore) {
- const _activeArgs3 = activeArgs;
- const source = _activeArgs3.source;
- const index = _activeArgs3.index;
- const oneCharBefore = source[index - 1];
- if (!isNullish(oneCharBefore) && isWhitespace(oneCharBefore)) {
- assertFunction(messageFunc);
- activeArgs.err(messageFunc(activeArgs.errTarget || source.charAt(index)));
- }
- }
-
- function afterOneOnly(obj) {
- after({ ...obj, onlyOneChar: true });
- }
- function expectAfter(messageFunc = messages.expectedAfter) {
- const _activeArgs4 = activeArgs;
- const source = _activeArgs4.source;
- const index = _activeArgs4.index;
- const oneCharAfter = source[index + 1];
- const twoCharsAfter = source[index + 2];
- const threeCharsAfter = source[index + 3];
- if (isNullish(oneCharAfter)) {
- return;
- }
- if (targetWhitespace === 'newline') {
-
- if (
- oneCharAfter === '\r' &&
- twoCharsAfter === '\n' &&
- (activeArgs.onlyOneChar || isNullish(threeCharsAfter) || !isWhitespace(threeCharsAfter))
- ) {
- return;
- }
-
- if (
- oneCharAfter === '\n' &&
- (activeArgs.onlyOneChar || isNullish(twoCharsAfter) || !isWhitespace(twoCharsAfter))
- ) {
- return;
- }
- }
- if (
- targetWhitespace === 'space' &&
- oneCharAfter === ' ' &&
- (activeArgs.onlyOneChar || isNullish(twoCharsAfter) || !isWhitespace(twoCharsAfter))
- ) {
- return;
- }
- assertFunction(messageFunc);
- activeArgs.err(messageFunc(activeArgs.errTarget || source.charAt(index)));
- }
- function rejectAfter(messageFunc = messages.rejectedAfter) {
- const _activeArgs5 = activeArgs;
- const source = _activeArgs5.source;
- const index = _activeArgs5.index;
- const oneCharAfter = source[index + 1];
- if (!isNullish(oneCharAfter) && isWhitespace(oneCharAfter)) {
- assertFunction(messageFunc);
- activeArgs.err(messageFunc(activeArgs.errTarget || source.charAt(index)));
- }
- }
- return {
- before,
- beforeAllowingIndentation,
- after,
- afterOneOnly,
- };
- };
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