455e003567
This saves some steps, as the regex parser does not have to backtrack for character classes, but is has to for alternates
56 lines
1.5 KiB
JavaScript
56 lines
1.5 KiB
JavaScript
// @flow
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import * as charCodes from "charcodes";
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// Matches a whole line break (where CRLF is considered a single
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// line break). Used to count lines.
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export const lineBreak = /\r\n?|[\n\u2028\u2029]/;
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export const lineBreakG = new RegExp(lineBreak.source, "g");
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// https://tc39.github.io/ecma262/#sec-line-terminators
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export function isNewLine(code: number): boolean {
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switch (code) {
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case charCodes.lineFeed:
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case charCodes.carriageReturn:
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case charCodes.lineSeparator:
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case charCodes.paragraphSeparator:
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return true;
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default:
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return false;
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}
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}
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export const skipWhiteSpace = /(?:\s|\/\/.*|\/\*[^]*?\*\/)*/g;
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// https://tc39.github.io/ecma262/#sec-white-space
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export function isWhitespace(code: number): boolean {
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switch (code) {
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case 0x0009: // CHARACTER TABULATION
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case 0x000b: // LINE TABULATION
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case 0x000c: // FORM FEED
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case charCodes.space:
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case charCodes.nonBreakingSpace:
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case charCodes.oghamSpaceMark:
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case 0x2000: // EN QUAD
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case 0x2001: // EM QUAD
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case 0x2002: // EN SPACE
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case 0x2003: // EM SPACE
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case 0x2004: // THREE-PER-EM SPACE
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case 0x2005: // FOUR-PER-EM SPACE
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case 0x2006: // SIX-PER-EM SPACE
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case 0x2007: // FIGURE SPACE
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case 0x2008: // PUNCTUATION SPACE
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case 0x2009: // THIN SPACE
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case 0x200a: // HAIR SPACE
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case 0x202f: // NARROW NO-BREAK SPACE
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case 0x205f: // MEDIUM MATHEMATICAL SPACE
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case 0x3000: // IDEOGRAPHIC SPACE
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case 0xfeff: // ZERO WIDTH NO-BREAK SPACE
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return true;
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default:
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return false;
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}
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}
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