1package lexers
 2
 3import (
 4	. "github.com/alecthomas/chroma/v2" // nolint
 5)
 6
 7// Svelte lexer.
 8var Svelte = Register(DelegatingLexer(HTML, MustNewLexer(
 9	&Config{
10		Name:      "Svelte",
11		Aliases:   []string{"svelte"},
12		Filenames: []string{"*.svelte"},
13		MimeTypes: []string{"application/x-svelte"},
14		DotAll:    true,
15	},
16	svelteRules,
17)))
18
19func svelteRules() Rules {
20	return Rules{
21		"root": {
22			// Let HTML handle the comments, including comments containing script and style tags
23			{`<!--`, Other, Push("comment")},
24			{
25				// Highlight script and style tags based on lang attribute
26				// and allow attributes besides lang
27				`(<\s*(?:script|style).*?lang\s*=\s*['"])` +
28					`(.+?)(['"].*?>)` +
29					`(.+?)` +
30					`(<\s*/\s*(?:script|style)\s*>)`,
31				UsingByGroup(2, 4, Other, Other, Other, Other, Other),
32				nil,
33			},
34			{
35				// Make sure `{` is not inside script or style tags
36				`(?<!<\s*(?:script|style)(?:(?!(?:script|style)\s*>).)*?)` +
37					`{` +
38					`(?!(?:(?!<\s*(?:script|style)).)*?(?:script|style)\s*>)`,
39				Punctuation,
40				Push("templates"),
41			},
42			// on:submit|preventDefault
43			{`(?<=\s+on:\w+(?:\|\w+)*)\|(?=\w+)`, Operator, nil},
44			{`.+?`, Other, nil},
45		},
46		"comment": {
47			{`-->`, Other, Pop(1)},
48			{`.+?`, Other, nil},
49		},
50		"templates": {
51			{`}`, Punctuation, Pop(1)},
52			// Let TypeScript handle strings and the curly braces inside them
53			{`(?<!(?<!\\)\\)(['"` + "`])" + `.*?(?<!(?<!\\)\\)\1`, Using("TypeScript"), nil},
54			// If there is another opening curly brace push to templates again
55			{"{", Punctuation, Push("templates")},
56			{`@(debug|html)\b`, Keyword, nil},
57			{
58				`(#await)(\s+)(\w+)(\s+)(then|catch)(\s+)(\w+)`,
59				ByGroups(Keyword, Text, Using("TypeScript"), Text,
60					Keyword, Text, Using("TypeScript"),
61				),
62				nil,
63			},
64			{`(#|/)(await|each|if|key)\b`, Keyword, nil},
65			{`(:else)(\s+)(if)?\b`, ByGroups(Keyword, Text, Keyword), nil},
66			{`:(catch|then)\b`, Keyword, nil},
67			{`[^{}]+`, Using("TypeScript"), nil},
68		},
69	}
70}