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block-lang.ts
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import { createRule } from "../utils"
import { getLangValue } from "../utils/ast-utils"
import type {
SvelteScriptElement,
SvelteStyleElement,
} from "svelte-eslint-parser/lib/ast"
export default createRule("block-lang", {
meta: {
docs: {
description:
"disallows the use of languages other than those specified in the configuration for the lang attribute of `<script>` and `<style>` blocks.",
category: "Best Practices",
recommended: false,
},
schema: [
{
type: "object",
properties: {
enforceScriptPresent: {
type: "boolean",
},
enforceStylePresent: {
type: "boolean",
},
script: {
oneOf: [
{
type: ["string", "null"],
},
{
type: "array",
items: {
type: ["string", "null"],
},
minItems: 1,
},
],
},
style: {
oneOf: [
{
type: ["string", "null"],
},
{
type: "array",
items: {
type: ["string", "null"],
},
minItems: 1,
},
],
},
},
additionalProperties: false,
},
],
messages: {},
type: "suggestion",
},
create(context) {
if (!context.parserServices.isSvelte) {
return {}
}
const enforceScriptPresent: boolean =
context.options[0]?.enforceScriptPresent ?? false
const enforceStylePresent: boolean =
context.options[0]?.enforceStylePresent ?? false
const scriptOption: string | null | (string | null)[] =
context.options[0]?.script ?? null
const allowedScriptLangs: (string | null)[] = Array.isArray(scriptOption)
? scriptOption
: [scriptOption]
const scriptNodes: SvelteScriptElement[] = []
const styleOption: string | null | (string | null)[] =
context.options[0]?.style ?? null
const allowedStyleLangs: (string | null)[] = Array.isArray(styleOption)
? styleOption
: [styleOption]
const styleNodes: SvelteStyleElement[] = []
return {
SvelteScriptElement(node) {
scriptNodes.push(node)
},
SvelteStyleElement(node) {
styleNodes.push(node)
},
"Program:exit"() {
if (scriptNodes.length === 0 && enforceScriptPresent) {
context.report({
loc: { line: 1, column: 1 },
message: `The <script> block should be present and its lang attribute should be ${prettyPrintLangs(
allowedScriptLangs,
)}.`,
})
}
for (const scriptNode of scriptNodes) {
if (
!allowedScriptLangs.includes(
getLangValue(scriptNode)?.toLowerCase() ?? null,
)
) {
context.report({
node: scriptNode,
message: `The lang attribute of the <script> block should be ${prettyPrintLangs(
allowedScriptLangs,
)}.`,
})
}
}
if (styleNodes.length === 0 && enforceStylePresent) {
context.report({
loc: { line: 1, column: 1 },
message: `The <style> block should be present and its lang attribute should be ${prettyPrintLangs(
allowedStyleLangs,
)}.`,
})
}
for (const styleNode of styleNodes) {
if (
!allowedStyleLangs.includes(
getLangValue(styleNode)?.toLowerCase() ?? null,
)
) {
context.report({
node: styleNode,
message: `The lang attribute of the <style> block should be ${prettyPrintLangs(
allowedStyleLangs,
)}.`,
})
}
}
},
}
},
})
/**
* Prints the list of allowed languages, with special handling of the `null` option.
*/
function prettyPrintLangs(langs: (string | null)[]): string {
const hasNull = langs.includes(null)
const nonNullLangs = langs
.filter((lang) => lang !== null)
.map((lang) => `"${lang}"`)
if (nonNullLangs.length === 0) {
// No special behaviour for `hasNull`, because that can never happen.
return "omitted"
}
const hasNullText = hasNull ? "either omitted or " : ""
const nonNullText =
nonNullLangs.length === 1
? nonNullLangs[0]
: `one of ${nonNullLangs.join(", ")}`
return hasNullText + nonNullText
}