JS: Added support for numeric separators (#1895)

This adds support for JavaScript's new numeric separators. E.g. `123_456`.

components/prism-javascript.js

@@ -16,7 +16,7 @@ Prism.languages.javascript = Prism.languages.extend('clike', {
 			lookbehind: true
 		},
 	],
-	'number': /\b(?:(?:0[xX][\dA-Fa-f]+|0[bB][01]+|0[oO][0-7]+)n?|\d+n|NaN|Infinity)\b|(?:\b\d+\.?\d*|\B\.\d+)(?:[Ee][+-]?\d+)?/,
+	'number': /\b(?:(?:0[xX](?:[\dA-Fa-f](?:_[\dA-Fa-f])?)+|0[bB](?:[01](?:_[01])?)+|0[oO](?:[0-7](?:_[0-7])?)+)n?|(?:\d(?:_\d)?)+n|NaN|Infinity)\b|(?:\b(?:\d(?:_\d)?)+\.?(?:\d(?:_\d)?)*|\B\.(?:\d(?:_\d)?)+)(?:[Ee][+-]?(?:\d(?:_\d)?)+)?/,
 	// Allow for all non-ASCII characters (See http://stackoverflow.com/a/2008444)
 	'function': /[_$a-zA-Z\xA0-\uFFFF][$\w\xA0-\uFFFF]*(?=\s*(?:\.\s*(?:apply|bind|call)\s*)?\()/,
 	'operator': /-[-=]?|\+[+=]?|!=?=?|<<?=?|>>?>?=?|=(?:==?|>)?|&[&=]?|\|[|=]?|\*\*?=?|\/=?|~|\^=?|%=?|\?|\.{3}/

prism.js

@@ -783,7 +783,7 @@ Prism.languages.javascript = Prism.languages.extend('clike', {
 			lookbehind: true
 		},
 	],
-	'number': /\b(?:(?:0[xX][\dA-Fa-f]+|0[bB][01]+|0[oO][0-7]+)n?|\d+n|NaN|Infinity)\b|(?:\b\d+\.?\d*|\B\.\d+)(?:[Ee][+-]?\d+)?/,
+	'number': /\b(?:(?:0[xX](?:[\dA-Fa-f](?:_[\dA-Fa-f])?)+|0[bB](?:[01](?:_[01])?)+|0[oO](?:[0-7](?:_[0-7])?)+)n?|(?:\d(?:_\d)?)+n|NaN|Infinity)\b|(?:\b(?:\d(?:_\d)?)+\.?(?:\d(?:_\d)?)*|\B\.(?:\d(?:_\d)?)+)(?:[Ee][+-]?(?:\d(?:_\d)?)+)?/,
 	// Allow for all non-ASCII characters (See http://stackoverflow.com/a/2008444)
 	'function': /[_$a-zA-Z\xA0-\uFFFF][$\w\xA0-\uFFFF]*(?=\s*(?:\.\s*(?:apply|bind|call)\s*)?\()/,
 	'operator': /-[-=]?|\+[+=]?|!=?=?|<<?=?|>>?>?=?|=(?:==?|>)?|&[&=]?|\|[|=]?|\*\*?=?|\/=?|~|\^=?|%=?|\?|\.{3}/

tests/languages/javascript/number_feature.test

@@ -7,11 +7,22 @@
 0o571
 0xbabe
 0xBABE
+
 NaN
 Infinity
+
 123n
 0x123n
 
+1_000_000_000_000
+1_000_000.220_720
+0b0101_0110_0011_1000
+0o12_34_56
+0x40_76_38_6A_73
+4_642_473_943_484_686_707n
+0.000_001
+1e10_000
+
 ----------------------------------------------------
 
 [
@@ -27,7 +38,15 @@ Infinity
 	["number", "NaN"],
 	["number", "Infinity"],
 	["number", "123n"],
-	["number", "0x123n"]
+	["number", "0x123n"],
+	["number", "1_000_000_000_000"],
+	["number", "1_000_000.220_720"],
+	["number", "0b0101_0110_0011_1000"],
+	["number", "0o12_34_56"],
+	["number", "0x40_76_38_6A_73"],
+	["number", "4_642_473_943_484_686_707n"],
+	["number", "0.000_001"],
+	["number", "1e10_000"]
 ]
 
 ----------------------------------------------------