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swift.js
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swift.js
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/*
Language: Swift
Description: Swift is a general-purpose programming language built using a modern approach to safety, performance, and software design patterns.
Author: Steven Van Impe <steven.vanimpe@icloud.com>
Contributors: Chris Eidhof <chris@eidhof.nl>, Nate Cook <natecook@gmail.com>, Alexander Lichter <manniL@gmx.net>, Richard Gibson <gibson042@github>
Website: https://swift.org
Category: common, system
*/
import * as Swift from './lib/kws_swift.js';
import {
concat,
either,
lookahead
} from '../lib/regex.js';
/** @type LanguageFn */
export default function(hljs) {
const WHITESPACE = {
match: /\s+/,
relevance: 0
};
// https://docs.swift.org/swift-book/ReferenceManual/LexicalStructure.html#ID411
const BLOCK_COMMENT = hljs.COMMENT(
'/\\*',
'\\*/',
{
contains: [ 'self' ]
}
);
const COMMENTS = [
hljs.C_LINE_COMMENT_MODE,
BLOCK_COMMENT
];
// https://docs.swift.org/swift-book/ReferenceManual/LexicalStructure.html#ID413
// https://docs.swift.org/swift-book/ReferenceManual/zzSummaryOfTheGrammar.html
const DOT_KEYWORD = {
match: [
/\./,
either(...Swift.dotKeywords, ...Swift.optionalDotKeywords)
],
className: {
2: "keyword"
}
};
const KEYWORD_GUARD = {
// Consume .keyword to prevent highlighting properties and methods as keywords.
match: concat(/\./, either(...Swift.keywords)),
relevance: 0
};
const PLAIN_KEYWORDS = Swift.keywords
.filter(kw => typeof kw === 'string')
.concat([ "_|0" ]); // seems common, so 0 relevance
const REGEX_KEYWORDS = Swift.keywords
.filter(kw => typeof kw !== 'string') // find regex
.concat(Swift.keywordTypes)
.map(Swift.keywordWrapper);
const KEYWORD = {
variants: [
{
className: 'keyword',
match: either(...REGEX_KEYWORDS, ...Swift.optionalDotKeywords)
}
]
};
// find all the regular keywords
const KEYWORDS = {
$pattern: either(
/\b\w+/, // regular keywords
/#\w+/ // number keywords
),
keyword: PLAIN_KEYWORDS
.concat(Swift.numberSignKeywords),
literal: Swift.literals
};
const KEYWORD_MODES = [
DOT_KEYWORD,
KEYWORD_GUARD,
KEYWORD
];
// https://github.com/apple/swift/tree/main/stdlib/public/core
const BUILT_IN_GUARD = {
// Consume .built_in to prevent highlighting properties and methods.
match: concat(/\./, either(...Swift.builtIns)),
relevance: 0
};
const BUILT_IN = {
className: 'built_in',
match: concat(/\b/, either(...Swift.builtIns), /(?=\()/)
};
const BUILT_INS = [
BUILT_IN_GUARD,
BUILT_IN
];
// https://docs.swift.org/swift-book/ReferenceManual/LexicalStructure.html#ID418
const OPERATOR_GUARD = {
// Prevent -> from being highlighting as an operator.
match: /->/,
relevance: 0
};
const OPERATOR = {
className: 'operator',
relevance: 0,
variants: [
{
match: Swift.operator
},
{
// dot-operator: only operators that start with a dot are allowed to use dots as
// characters (..., ...<, .*, etc). So there rule here is: a dot followed by one or more
// characters that may also include dots.
match: `\\.(\\.|${Swift.operatorCharacter})+`
}
]
};
const OPERATORS = [
OPERATOR_GUARD,
OPERATOR
];
// https://docs.swift.org/swift-book/ReferenceManual/LexicalStructure.html#grammar_numeric-literal
// TODO: Update for leading `-` after lookbehind is supported everywhere
const decimalDigits = '([0-9]_*)+';
const hexDigits = '([0-9a-fA-F]_*)+';
const NUMBER = {
className: 'number',
relevance: 0,
variants: [
// decimal floating-point-literal (subsumes decimal-literal)
{
match: `\\b(${decimalDigits})(\\.(${decimalDigits}))?` + `([eE][+-]?(${decimalDigits}))?\\b`
},
// hexadecimal floating-point-literal (subsumes hexadecimal-literal)
{
match: `\\b0x(${hexDigits})(\\.(${hexDigits}))?` + `([pP][+-]?(${decimalDigits}))?\\b`
},
// octal-literal
{
match: /\b0o([0-7]_*)+\b/
},
// binary-literal
{
match: /\b0b([01]_*)+\b/
}
]
};
// https://docs.swift.org/swift-book/ReferenceManual/LexicalStructure.html#grammar_string-literal
const ESCAPED_CHARACTER = (rawDelimiter = "") => ({
className: 'subst',
variants: [
{
match: concat(/\\/, rawDelimiter, /[0\\tnr"']/)
},
{
match: concat(/\\/, rawDelimiter, /u\{[0-9a-fA-F]{1,8}\}/)
}
]
});
const ESCAPED_NEWLINE = (rawDelimiter = "") => ({
className: 'subst',
match: concat(/\\/, rawDelimiter, /[\t ]*(?:[\r\n]|\r\n)/)
});
const INTERPOLATION = (rawDelimiter = "") => ({
className: 'subst',
label: "interpol",
begin: concat(/\\/, rawDelimiter, /\(/),
end: /\)/
});
const MULTILINE_STRING = (rawDelimiter = "") => ({
begin: concat(rawDelimiter, /"""/),
end: concat(/"""/, rawDelimiter),
contains: [
ESCAPED_CHARACTER(rawDelimiter),
ESCAPED_NEWLINE(rawDelimiter),
INTERPOLATION(rawDelimiter)
]
});
const SINGLE_LINE_STRING = (rawDelimiter = "") => ({
begin: concat(rawDelimiter, /"/),
end: concat(/"/, rawDelimiter),
contains: [
ESCAPED_CHARACTER(rawDelimiter),
INTERPOLATION(rawDelimiter)
]
});
const STRING = {
className: 'string',
variants: [
MULTILINE_STRING(),
MULTILINE_STRING("#"),
MULTILINE_STRING("##"),
MULTILINE_STRING("###"),
SINGLE_LINE_STRING(),
SINGLE_LINE_STRING("#"),
SINGLE_LINE_STRING("##"),
SINGLE_LINE_STRING("###")
]
};
// https://docs.swift.org/swift-book/ReferenceManual/LexicalStructure.html#ID412
const QUOTED_IDENTIFIER = {
match: concat(/`/, Swift.identifier, /`/)
};
const IMPLICIT_PARAMETER = {
className: 'variable',
match: /\$\d+/
};
const PROPERTY_WRAPPER_PROJECTION = {
className: 'variable',
match: `\\$${Swift.identifierCharacter}+`
};
const IDENTIFIERS = [
QUOTED_IDENTIFIER,
IMPLICIT_PARAMETER,
PROPERTY_WRAPPER_PROJECTION
];
// https://docs.swift.org/swift-book/ReferenceManual/Attributes.html
const AVAILABLE_ATTRIBUTE = {
match: /(@|#(un)?)available/,
className: "keyword",
starts: {
contains: [
{
begin: /\(/,
end: /\)/,
keywords: Swift.availabilityKeywords,
contains: [
...OPERATORS,
NUMBER,
STRING
]
}
]
}
};
const KEYWORD_ATTRIBUTE = {
className: 'keyword',
match: concat(/@/, either(...Swift.keywordAttributes))
};
const USER_DEFINED_ATTRIBUTE = {
className: 'meta',
match: concat(/@/, Swift.identifier)
};
const ATTRIBUTES = [
AVAILABLE_ATTRIBUTE,
KEYWORD_ATTRIBUTE,
USER_DEFINED_ATTRIBUTE
];
// https://docs.swift.org/swift-book/ReferenceManual/Types.html
const TYPE = {
match: lookahead(/\b[A-Z]/),
relevance: 0,
contains: [
{ // Common Apple frameworks, for relevance boost
className: 'type',
match: concat(/(AV|CA|CF|CG|CI|CL|CM|CN|CT|MK|MP|MTK|MTL|NS|SCN|SK|UI|WK|XC)/, Swift.identifierCharacter, '+')
},
{ // Type identifier
className: 'type',
match: Swift.typeIdentifier,
relevance: 0
},
{ // Optional type
match: /[?!]+/,
relevance: 0
},
{ // Variadic parameter
match: /\.\.\./,
relevance: 0
},
{ // Protocol composition
match: concat(/\s+&\s+/, lookahead(Swift.typeIdentifier)),
relevance: 0
}
]
};
const GENERIC_ARGUMENTS = {
begin: /</,
end: />/,
keywords: KEYWORDS,
contains: [
...COMMENTS,
...KEYWORD_MODES,
...ATTRIBUTES,
OPERATOR_GUARD,
TYPE
]
};
TYPE.contains.push(GENERIC_ARGUMENTS);
// https://docs.swift.org/swift-book/ReferenceManual/Expressions.html#ID552
// Prevents element names from being highlighted as keywords.
const TUPLE_ELEMENT_NAME = {
match: concat(Swift.identifier, /\s*:/),
keywords: "_|0",
relevance: 0
};
// Matches tuples as well as the parameter list of a function type.
const TUPLE = {
begin: /\(/,
end: /\)/,
relevance: 0,
keywords: KEYWORDS,
contains: [
'self',
TUPLE_ELEMENT_NAME,
...COMMENTS,
...KEYWORD_MODES,
...BUILT_INS,
...OPERATORS,
NUMBER,
STRING,
...IDENTIFIERS,
...ATTRIBUTES,
TYPE
]
};
const GENERIC_PARAMETERS = {
begin: /</,
end: />/,
contains: [
...COMMENTS,
TYPE
]
};
const FUNCTION_PARAMETER_NAME = {
begin: either(
lookahead(concat(Swift.identifier, /\s*:/)),
lookahead(concat(Swift.identifier, /\s+/, Swift.identifier, /\s*:/))
),
end: /:/,
relevance: 0,
contains: [
{
className: 'keyword',
match: /\b_\b/
},
{
className: 'params',
match: Swift.identifier
}
]
};
const FUNCTION_PARAMETERS = {
begin: /\(/,
end: /\)/,
keywords: KEYWORDS,
contains: [
FUNCTION_PARAMETER_NAME,
...COMMENTS,
...KEYWORD_MODES,
...OPERATORS,
NUMBER,
STRING,
...ATTRIBUTES,
TYPE,
TUPLE
],
endsParent: true,
illegal: /["']/
};
// https://docs.swift.org/swift-book/ReferenceManual/Declarations.html#ID362
const FUNCTION = {
match: [
/func/,
/\s+/,
either(QUOTED_IDENTIFIER.match, Swift.identifier, Swift.operator)
],
className: {
1: "keyword",
3: "title.function"
},
contains: [
GENERIC_PARAMETERS,
FUNCTION_PARAMETERS,
WHITESPACE
],
illegal: [
/\[/,
/%/
]
};
// https://docs.swift.org/swift-book/ReferenceManual/Declarations.html#ID375
// https://docs.swift.org/swift-book/ReferenceManual/Declarations.html#ID379
const INIT_SUBSCRIPT = {
match: [
/\b(?:subscript|init[?!]?)/,
/\s*(?=[<(])/,
],
className: {
1: "keyword"
},
contains: [
GENERIC_PARAMETERS,
FUNCTION_PARAMETERS,
WHITESPACE
],
illegal: /\[|%/
};
// https://docs.swift.org/swift-book/ReferenceManual/Declarations.html#ID380
const OPERATOR_DECLARATION = {
match: [
/operator/,
/\s+/,
Swift.operator
],
className: {
1: "keyword",
3: "title"
}
};
// https://docs.swift.org/swift-book/ReferenceManual/Declarations.html#ID550
const PRECEDENCEGROUP = {
begin: [
/precedencegroup/,
/\s+/,
Swift.typeIdentifier
],
className: {
1: "keyword",
3: "title"
},
contains: [ TYPE ],
keywords: [
...Swift.precedencegroupKeywords,
...Swift.literals
],
end: /}/
};
// Add supported submodes to string interpolation.
for (const variant of STRING.variants) {
const interpolation = variant.contains.find(mode => mode.label === "interpol");
// TODO: Interpolation can contain any expression, so there's room for improvement here.
interpolation.keywords = KEYWORDS;
const submodes = [
...KEYWORD_MODES,
...BUILT_INS,
...OPERATORS,
NUMBER,
STRING,
...IDENTIFIERS
];
interpolation.contains = [
...submodes,
{
begin: /\(/,
end: /\)/,
contains: [
'self',
...submodes
]
}
];
}
return {
name: 'Swift',
keywords: KEYWORDS,
contains: [
...COMMENTS,
FUNCTION,
INIT_SUBSCRIPT,
{
beginKeywords: 'struct protocol class extension enum actor',
end: '\\{',
excludeEnd: true,
keywords: KEYWORDS,
contains: [
hljs.inherit(hljs.TITLE_MODE, {
className: "title.class",
begin: /[A-Za-z$_][\u00C0-\u02B80-9A-Za-z$_]*/
}),
...KEYWORD_MODES
]
},
OPERATOR_DECLARATION,
PRECEDENCEGROUP,
{
beginKeywords: 'import',
end: /$/,
contains: [ ...COMMENTS ],
relevance: 0
},
...KEYWORD_MODES,
...BUILT_INS,
...OPERATORS,
NUMBER,
STRING,
...IDENTIFIERS,
...ATTRIBUTES,
TYPE,
TUPLE
]
};
}