refractor
Version:
Lightweight, robust, elegant virtual syntax highlighting using Prism
144 lines (141 loc) • 7.11 kB
JavaScript
// @ts-nocheck
/**
* @import {Refractor} from '../lib/core.js'
*/
scheme.displayName = 'scheme'
scheme.aliases = []
/** @param {Refractor} Prism */
export default function scheme(Prism) {
;(function (Prism) {
Prism.languages.scheme = {
// this supports "normal" single-line comments:
// ; comment
// and (potentially nested) multiline comments:
// #| comment #| nested |# still comment |#
// (only 1 level of nesting is supported)
comment:
/;.*|#;\s*(?:\((?:[^()]|\([^()]*\))*\)|\[(?:[^\[\]]|\[[^\[\]]*\])*\])|#\|(?:[^#|]|#(?!\|)|\|(?!#)|#\|(?:[^#|]|#(?!\|)|\|(?!#))*\|#)*\|#/,
string: {
pattern: /"(?:[^"\\]|\\.)*"/,
greedy: true
},
symbol: {
pattern: /'[^()\[\]#'\s]+/,
greedy: true
},
char: {
pattern:
/#\\(?:[ux][a-fA-F\d]+\b|[-a-zA-Z]+\b|[\uD800-\uDBFF][\uDC00-\uDFFF]|\S)/,
greedy: true
},
'lambda-parameter': [
// https://www.cs.cmu.edu/Groups/AI/html/r4rs/r4rs_6.html#SEC30
{
pattern:
/((?:^|[^'`#])[(\[]lambda\s+)(?:[^|()\[\]'\s]+|\|(?:[^\\|]|\\.)*\|)/,
lookbehind: true
},
{
pattern: /((?:^|[^'`#])[(\[]lambda\s+[(\[])[^()\[\]']+/,
lookbehind: true
}
],
keyword: {
pattern:
/((?:^|[^'`#])[(\[])(?:begin|case(?:-lambda)?|cond(?:-expand)?|define(?:-library|-macro|-record-type|-syntax|-values)?|defmacro|delay(?:-force)?|do|else|except|export|guard|if|import|include(?:-ci|-library-declarations)?|lambda|let(?:rec)?(?:-syntax|-values|\*)?|let\*-values|only|parameterize|prefix|(?:quasi-?)?quote|rename|set!|syntax-(?:case|rules)|unless|unquote(?:-splicing)?|when)(?=[()\[\]\s]|$)/,
lookbehind: true
},
builtin: {
// all functions of the base library of R7RS plus some of built-ins of R5Rs
pattern:
/((?:^|[^'`#])[(\[])(?:abs|and|append|apply|assoc|ass[qv]|binary-port\?|boolean=?\?|bytevector(?:-append|-copy|-copy!|-length|-u8-ref|-u8-set!|\?)?|caar|cadr|call-with-(?:current-continuation|port|values)|call\/cc|car|cdar|cddr|cdr|ceiling|char(?:->integer|-ready\?|\?|<\?|<=\?|=\?|>\?|>=\?)|close-(?:input-port|output-port|port)|complex\?|cons|current-(?:error|input|output)-port|denominator|dynamic-wind|eof-object\??|eq\?|equal\?|eqv\?|error|error-object(?:-irritants|-message|\?)|eval|even\?|exact(?:-integer-sqrt|-integer\?|\?)?|expt|features|file-error\?|floor(?:-quotient|-remainder|\/)?|flush-output-port|for-each|gcd|get-output-(?:bytevector|string)|inexact\??|input-port(?:-open\?|\?)|integer(?:->char|\?)|lcm|length|list(?:->string|->vector|-copy|-ref|-set!|-tail|\?)?|make-(?:bytevector|list|parameter|string|vector)|map|max|member|memq|memv|min|modulo|negative\?|newline|not|null\?|number(?:->string|\?)|numerator|odd\?|open-(?:input|output)-(?:bytevector|string)|or|output-port(?:-open\?|\?)|pair\?|peek-char|peek-u8|port\?|positive\?|procedure\?|quotient|raise|raise-continuable|rational\?|rationalize|read-(?:bytevector|bytevector!|char|error\?|line|string|u8)|real\?|remainder|reverse|round|set-c[ad]r!|square|string(?:->list|->number|->symbol|->utf8|->vector|-append|-copy|-copy!|-fill!|-for-each|-length|-map|-ref|-set!|\?|<\?|<=\?|=\?|>\?|>=\?)?|substring|symbol(?:->string|\?|=\?)|syntax-error|textual-port\?|truncate(?:-quotient|-remainder|\/)?|u8-ready\?|utf8->string|values|vector(?:->list|->string|-append|-copy|-copy!|-fill!|-for-each|-length|-map|-ref|-set!|\?)?|with-exception-handler|write-(?:bytevector|char|string|u8)|zero\?)(?=[()\[\]\s]|$)/,
lookbehind: true
},
operator: {
pattern: /((?:^|[^'`#])[(\[])(?:[-+*%/]|[<>]=?|=>?)(?=[()\[\]\s]|$)/,
lookbehind: true
},
number: {
// The number pattern from [the R7RS spec](https://small.r7rs.org/attachment/r7rs.pdf).
//
// <number> := <num 2>|<num 8>|<num 10>|<num 16>
// <num R> := <prefix R><complex R>
// <complex R> := <real R>(?:@<real R>|<imaginary R>)?|<imaginary R>
// <imaginary R> := [+-](?:<ureal R>|(?:inf|nan)\.0)?i
// <real R> := [+-]?<ureal R>|[+-](?:inf|nan)\.0
// <ureal R> := <uint R>(?:\/<uint R>)?
// | <decimal R>
//
// <decimal 10> := (?:\d+(?:\.\d*)?|\.\d+)(?:e[+-]?\d+)?
// <uint R> := <digit R>+
// <prefix R> := <radix R>(?:#[ei])?|(?:#[ei])?<radix R>
// <radix 2> := #b
// <radix 8> := #o
// <radix 10> := (?:#d)?
// <radix 16> := #x
// <digit 2> := [01]
// <digit 8> := [0-7]
// <digit 10> := \d
// <digit 16> := [0-9a-f]
//
// The problem with this grammar is that the resulting regex is way to complex, so we simplify by grouping all
// non-decimal bases together. This results in a decimal (dec) and combined binary, octal, and hexadecimal (box)
// pattern:
pattern: RegExp(
SortedBNF({
'<ureal dec>':
/\d+(?:\/\d+)|(?:\d+(?:\.\d*)?|\.\d+)(?:[esfdl][+-]?\d+)?/.source,
'<real dec>': /[+-]?<ureal dec>|[+-](?:inf|nan)\.0/.source,
'<imaginary dec>': /[+-](?:<ureal dec>|(?:inf|nan)\.0)?i/.source,
'<complex dec>':
/<real dec>(?:@<real dec>|<imaginary dec>)?|<imaginary dec>/
.source,
'<num dec>': /(?:#d(?:#[ei])?|#[ei](?:#d)?)?<complex dec>/.source,
'<ureal box>': /[0-9a-f]+(?:\/[0-9a-f]+)?/.source,
'<real box>': /[+-]?<ureal box>|[+-](?:inf|nan)\.0/.source,
'<imaginary box>': /[+-](?:<ureal box>|(?:inf|nan)\.0)?i/.source,
'<complex box>':
/<real box>(?:@<real box>|<imaginary box>)?|<imaginary box>/
.source,
'<num box>': /#[box](?:#[ei])?|(?:#[ei])?#[box]<complex box>/
.source,
'<number>': /(^|[()\[\]\s])(?:<num dec>|<num box>)(?=[()\[\]\s]|$)/
.source
}),
'i'
),
lookbehind: true
},
boolean: {
pattern: /(^|[()\[\]\s])#(?:[ft]|false|true)(?=[()\[\]\s]|$)/,
lookbehind: true
},
function: {
pattern:
/((?:^|[^'`#])[(\[])(?:[^|()\[\]'\s]+|\|(?:[^\\|]|\\.)*\|)(?=[()\[\]\s]|$)/,
lookbehind: true
},
identifier: {
pattern: /(^|[()\[\]\s])\|(?:[^\\|]|\\.)*\|(?=[()\[\]\s]|$)/,
lookbehind: true,
greedy: true
},
punctuation: /[()\[\]']/
}
/**
* Given a topologically sorted BNF grammar, this will return the RegExp source of last rule of the grammar.
*
* @param {Record<string, string>} grammar
* @returns {string}
*/
function SortedBNF(grammar) {
for (var key in grammar) {
grammar[key] = grammar[key].replace(/<[\w\s]+>/g, function (key) {
return '(?:' + grammar[key].trim() + ')'
})
}
// return the last item
return grammar[key]
}
})(Prism)
}