84 lines
2.1 KiB
JavaScript
84 lines
2.1 KiB
JavaScript
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/**
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* The MIT License (MIT)
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* Copyright (c) 2017-present Dmitry Soshnikov <dmitry.soshnikov@gmail.com>
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*/
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'use strict';
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var UPPER_A_CP = 'A'.codePointAt(0);
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var UPPER_Z_CP = 'Z'.codePointAt(0);
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var LOWER_A_CP = 'a'.codePointAt(0);
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var LOWER_Z_CP = 'z'.codePointAt(0);
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var DIGIT_0_CP = '0'.codePointAt(0);
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var DIGIT_9_CP = '9'.codePointAt(0);
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/**
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* A regexp-tree plugin to transform coded chars into simple chars.
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*
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* \u0061 -> a
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*/
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module.exports = {
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Char: function Char(path) {
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var node = path.node,
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parent = path.parent;
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if (isNaN(node.codePoint) || node.kind === 'simple') {
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return;
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}
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if (parent.type === 'ClassRange') {
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if (!isSimpleRange(parent)) {
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return;
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}
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}
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if (!isPrintableASCIIChar(node.codePoint)) {
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return;
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}
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var symbol = String.fromCodePoint(node.codePoint);
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var newChar = {
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type: 'Char',
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kind: 'simple',
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value: symbol,
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symbol: symbol,
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codePoint: node.codePoint
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};
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if (needsEscape(symbol, parent.type)) {
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newChar.escaped = true;
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}
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path.replace(newChar);
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}
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};
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/**
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* Checks if a range is included either in 0-9, a-z or A-Z
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* @param classRange
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* @returns {boolean}
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*/
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function isSimpleRange(classRange) {
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var from = classRange.from,
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to = classRange.to;
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return from.codePoint >= DIGIT_0_CP && from.codePoint <= DIGIT_9_CP && to.codePoint >= DIGIT_0_CP && to.codePoint <= DIGIT_9_CP || from.codePoint >= UPPER_A_CP && from.codePoint <= UPPER_Z_CP && to.codePoint >= UPPER_A_CP && to.codePoint <= UPPER_Z_CP || from.codePoint >= LOWER_A_CP && from.codePoint <= LOWER_Z_CP && to.codePoint >= LOWER_A_CP && to.codePoint <= LOWER_Z_CP;
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}
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/**
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* Checks if a code point in the range of printable ASCII chars
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* (DEL char excluded)
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* @param codePoint
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* @returns {boolean}
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*/
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function isPrintableASCIIChar(codePoint) {
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return codePoint >= 0x20 && codePoint <= 0x7e;
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}
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function needsEscape(symbol, parentType) {
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if (parentType === 'ClassRange' || parentType === 'CharacterClass') {
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return (/[\]\\^-]/.test(symbol)
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);
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}
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return (/[*[()+?^$./\\|{}]/.test(symbol)
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);
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}
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