StackGenVis: Alignment of Data, Algorithms, and Models for Stacking Ensemble Learning Using Performance Metrics
https://doi.org/10.1109/TVCG.2020.3030352
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125 lines
3.3 KiB
125 lines
3.3 KiB
var isHex = require('../../tokenizer').isHex;
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var TYPE = require('../../tokenizer').TYPE;
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var IDENTIFIER = TYPE.Identifier;
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var NUMBER = TYPE.Number;
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var PLUSSIGN = TYPE.PlusSign;
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var HYPHENMINUS = TYPE.HyphenMinus;
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var FULLSTOP = TYPE.FullStop;
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var QUESTIONMARK = TYPE.QuestionMark;
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function scanUnicodeNumber(scanner) {
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for (var pos = scanner.tokenStart + 1; pos < scanner.tokenEnd; pos++) {
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var code = scanner.source.charCodeAt(pos);
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// break on fullstop or hyperminus/plussign after exponent
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if (code === FULLSTOP || code === PLUSSIGN) {
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// break token, exclude symbol
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scanner.tokenStart = pos;
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return false;
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}
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}
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return true;
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}
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// https://drafts.csswg.org/css-syntax-3/#urange
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function scanUnicodeRange(scanner) {
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var hexStart = scanner.tokenStart + 1; // skip +
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var hexLength = 0;
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scan: {
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if (scanner.tokenType === NUMBER) {
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if (scanner.source.charCodeAt(scanner.tokenStart) !== FULLSTOP && scanUnicodeNumber(scanner)) {
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scanner.next();
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} else if (scanner.source.charCodeAt(scanner.tokenStart) !== HYPHENMINUS) {
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break scan;
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}
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} else {
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scanner.next(); // PLUSSIGN
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}
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if (scanner.tokenType === HYPHENMINUS) {
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scanner.next();
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}
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if (scanner.tokenType === NUMBER) {
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scanner.next();
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}
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if (scanner.tokenType === IDENTIFIER) {
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scanner.next();
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}
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if (scanner.tokenStart === hexStart) {
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scanner.error('Unexpected input', hexStart);
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}
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}
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// validate for U+x{1,6} or U+x{1,6}-x{1,6}
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// where x is [0-9a-fA-F]
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for (var i = hexStart, wasHyphenMinus = false; i < scanner.tokenStart; i++) {
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var code = scanner.source.charCodeAt(i);
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if (isHex(code) === false && (code !== HYPHENMINUS || wasHyphenMinus)) {
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scanner.error('Unexpected input', i);
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}
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if (code === HYPHENMINUS) {
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// hex sequence shouldn't be an empty
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if (hexLength === 0) {
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scanner.error('Unexpected input', i);
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}
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wasHyphenMinus = true;
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hexLength = 0;
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} else {
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hexLength++;
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// too long hex sequence
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if (hexLength > 6) {
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scanner.error('Too long hex sequence', i);
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}
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}
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}
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// check we have a non-zero sequence
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if (hexLength === 0) {
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scanner.error('Unexpected input', i - 1);
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}
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// U+abc???
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if (!wasHyphenMinus) {
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// consume as many U+003F QUESTION MARK (?) code points as possible
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for (; hexLength < 6 && !scanner.eof; scanner.next()) {
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if (scanner.tokenType !== QUESTIONMARK) {
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break;
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}
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hexLength++;
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}
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}
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}
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module.exports = {
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name: 'UnicodeRange',
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structure: {
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value: String
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},
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parse: function() {
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var start = this.scanner.tokenStart;
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this.scanner.next(); // U or u
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scanUnicodeRange(this.scanner);
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return {
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type: 'UnicodeRange',
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loc: this.getLocation(start, this.scanner.tokenStart),
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value: this.scanner.substrToCursor(start)
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};
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},
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generate: function(node) {
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this.chunk(node.value);
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}
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};
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