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import { findWidgetScriptSyntaxError } from "./widget-script-syntax.js";
describe("widget script syntax", () => {
it("maps a raw newline in a single-quoted string to the original widget line", () => {
const widgetCode = "\n<section>\n <script>const a='x\n'+b;</script>\n</section>";
expect(findWidgetScriptSyntaxError(widgetCode)).toEqual({
message: "Unterminated string constant",
line: 3,
column: 18,
snippet: "<script>const a='x",
scriptIndex: 1,
});
});
it.each([
"<p>No scripts</p>",
'<script>const html = "<!--<script></script>-->";</script>',
'<script>a = "<!--"; </script>',
'<script>const html = "<!--<script></script>";</script>',
'<script>const html = "<!--<script>-->";</script>',
'<script>const html = "<!--<ScRiPt/></SCRIPT>-->";</script>',
'<script type="module">await Promise.resolve();</script>',
"<script>#!/usr/bin/env node\nconst a=1;</script>",
"<script>const value = 1;",
'<script>const value = "</scripture>";</script>',
"<script-example>const =</script-example>",
"1 < 2 <script>const value = 1;</script>",
"<!doctype html><script>const value = 1;</script>",
"<script>const a='x\\n'; document.body.textContent = a;</script>",
'<script type="module">const value = await Promise.resolve(1); export { value };</script>',
'<script type=" Text/JavaScript ">const value = 1;</script>',
'<script data-label="src=ignored > type=application/json">const value = 1;</SCRIPT>',
'<button onclick="const =">Handlers are not parsed</button>',
])("accepts valid scripts or markup: %s", (widgetCode) => {
expect(findWidgetScriptSyntaxError(widgetCode)).toBeUndefined();
});
it.each([
"",
"type",
'type=""',
"type='text/javascript'",
"type=application/javascript",
'TYPE=" TEXT/ECMASCRIPT "',
"type=application/ecmascript",
"type=application/x-javascript",
"type=text/jscript",
"type=text/javascript1.5",
"type=text/livescript",
])("rejects top-level await in classic scripts: %s", (attributes) => {
expect(
findWidgetScriptSyntaxError(`<script ${attributes}>await Promise.resolve();</script>`),
).toMatchObject({ scriptIndex: 1 });
});
it("does not allow wrapped-function grammar", () => {
expect(findWidgetScriptSyntaxError("<script>return 1;</script>")).toBeDefined();
});
it.each([
'type="application/json"',
"type='application/ld+json'",
"type=importmap",
"type=text/template",
"type=text/x-handlebars-template",
'src="script.js"',
"src='script.js'",
"SRC=script.js",
"src",
])("skips non-JavaScript and external scripts: %s", (attributes) => {
expect(findWidgetScriptSyntaxError(`<script ${attributes}>const =</script>`)).toBeUndefined();
});
it.each(["<script>const a = 1;</script>", '<script type="application/json">invalid JS</script>'])(
"maps the second script after %s and stops at a case-insensitive raw-text close",
(first) => {
const widgetCode = `${first}\r\n<p>Text</p>\r\n<script>const a = "</SCRIPT>";</script>`;
expect(findWidgetScriptSyntaxError(widgetCode)).toEqual({
message: "Unterminated string constant",
line: 3,
column: 18,
snippet: '<script>const a = "</SCRIPT>";</script>',
scriptIndex: 2,
});
},
);
it("reports only the first error across multiple scripts", () => {
expect(
findWidgetScriptSyntaxError("<script>const =</script><script>let =</script>"),
).toMatchObject({ scriptIndex: 1, line: 1, column: 14 });
});
it.each([
"<!-- <script>const =</script> -->",
"<!-- <script>const =</script>",
'<div title="<script>const =</script>">Text</div>',
"<div title='<script>const =</script>'>Text</div>",
"<textarea><script>const =</script></textarea>",
"<plaintext></plaintext><script>const =</script>",
'<div title="<script>const =</script>',
])("ignores script-looking text outside script elements: %s", (widgetCode) => {
expect(findWidgetScriptSyntaxError(widgetCode)).toBeUndefined();
});
it.each(["style", "textarea", "title", "xmp", "iframe", "noembed", "noframes", "noscript"])(
"skips %s content and resumes at its actual end tag",
(tag) => {
const prefix = `<${tag}>ignored </${tag}x><script>const =</script></${tag.toUpperCase()} >`;
expect(findWidgetScriptSyntaxError(prefix)).toBeUndefined();
expect(findWidgetScriptSyntaxError(`${prefix}\n<script>const =</script>`)).toMatchObject({
scriptIndex: 1,
line: 2,
column: 14,
});
expect(findWidgetScriptSyntaxError(`<${tag}><script>const =</script>`)).toBeUndefined();
},
);
it("preserves offsets and script indexes after skipping inert HTML contexts", () => {
const widgetCode = [
"<!-- <script>const =</script> -->",
"<textarea><script>const =</script></textarea>",
'<div title="İ <script>const =</script>"></div>',
" <script>const =</script>",
].join("\n");
expect(findWidgetScriptSyntaxError(widgetCode)).toEqual({
message: "Unexpected token",
scriptIndex: 1,
line: 4,
column: 16,
snippet: "<script>const =</script>",
});
});
it.each(["</script/>", '</script foo="bar">', "</SCRIPT >", ""])(
"parses the script body through its terminator or EOF: %s",
(endTag) => {
expect(findWidgetScriptSyntaxError(`<script>const =${endTag}`)).toMatchObject({
scriptIndex: 1,
line: 1,
column: 14,
});
expect(findWidgetScriptSyntaxError(`<script>const value = 1;${endTag}`)).toBeUndefined();
if (endTag) {
expect(
findWidgetScriptSyntaxError(
`<script>const value = 1;${endTag}\n<script>const =</script>`,
),
).toMatchObject({ scriptIndex: 2, line: 2, column: 14 });
}
},
);
it.each([
'<script>const html = "<script></script>";</script>',
'<script>const html = "<!--<scripture></script>";</script>',
])("ends script data unless the exact script token double-escapes it: %s", (widgetCode) => {
expect(findWidgetScriptSyntaxError(widgetCode)?.message).toBe("Unterminated string constant");
});
it.each([
"<svg><script><![CDATA[const value = 1;]]></script></svg>",
"<svg><svg></svg><script><![CDATA[const value = 1;]]></script></svg>",
"<svg><svg/><script><![CDATA[const value = 1;]]></script></svg>",
'<svg><script><![CDATA[const text = "</script>";]]></script></svg>',
"<svg><title/><style/><script><![CDATA[const value = 1;]]></script></svg>",
"<div><svg><text><![CDATA[Example: > <script>const =</script>]]></text></svg></div>",
'<div><svg><foreignObject><script>const text = "<![CDATA[";</script></foreignObject></svg></div>',
"<svg><foreignObject/><script><![CDATA[const value = 1;]]></script></svg>",
'<SVG xmlns="http://www.w3.org/2000/svg"><script> \n<![CDATA[const value = 1;]]> \n</script></SVG>',
])("parses CDATA-wrapped scripts in SVG: %s", (widgetCode) => {
expect(findWidgetScriptSyntaxError(widgetCode)).toBeUndefined();
});
it.each([
{
widgetCode: "<svg><script><![CDATA[const =]]></script></svg>",
line: 1,
column: 28,
snippet: "<svg><script><![CDATA[const =]]></script></svg>",
},
{
widgetCode: "<svg>\n <script> <![CDATA[const =]]> </script>\n</svg>",
line: 2,
column: 27,
snippet: "<script> <![CDATA[const =]]> </script>",
},
{
widgetCode: "<svg>\r\n<script>\n<![CDATA[\nconst =\n]]>\n</script></svg>",
line: 4,
column: 6,
snippet: "const =",
},
])(
"maps CDATA errors to the original widget: $widgetCode",
({ widgetCode, line, column, snippet }) => {
expect(findWidgetScriptSyntaxError(widgetCode)).toEqual({
message: "Unexpected token",
scriptIndex: 1,
line,
column,
snippet,
});
},
);
it.each([
"<svg><title/></svg><script>const =</script>",
"<svg><style/><script>const =</script></svg>",
'<svg><script><![CDATA[const text = "</script>";]]></script></svg><script>const =</script>',
"<svg><text><![CDATA[text]]></text></svg><script>const =</script>",
"<svg><foreignObject><script>const =</script></foreignObject></svg>",
"<svg><foreignObject><script><![CDATA[const value = 1;]]></script></foreignObject></svg>",
])("still reaches scripts after self-closing or CDATA foreign content: %s", (widgetCode) => {
expect(findWidgetScriptSyntaxError(widgetCode)).toMatchObject({ line: 1 });
});
it.each(["", "<svg/>", "<svg></svg>", "<svg><svg/></svg>"])(
"leaves CDATA markers outside SVG untouched after %s",
(prefix) => {
expect(
findWidgetScriptSyntaxError(`${prefix}<script><![CDATA[const value = 1;]]></script>`),
).toMatchObject({ message: "Unexpected token", scriptIndex: 1 });
},
);
it.each(["text/javascript", "text/javascript", "module"])(
"validates scripts whose type contains character references: %s",
(type) => {
expect(findWidgetScriptSyntaxError(`<script type="${type}">const =</script>`)).toMatchObject({
message: "Unexpected token",
scriptIndex: 1,
});
},
);
it("bounds the offending line snippet", () => {
const widgetCode = `<script>const = ${"x".repeat(1_000)}</script>`;
expect(findWidgetScriptSyntaxError(widgetCode)?.snippet).toBe(widgetCode.slice(0, 160));
});
});
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