2 changed files with 15 additions and 0 deletions
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+11 -0src/index.js
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+4 -0test/index.js
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src/index.js
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| @@ -2,6 +2,17 @@ export default function doctypeToString(doctype) { | |||||
| if (doctype === null) { | if (doctype === null) { | ||||
| return '' | return '' | ||||
| } | } | ||||
| // Checking with instanceof DocumentType might be neater, but how to get a | |||||
| // reference to DocumentType without assuming it to be available globally? | |||||
| // To play nice with custom DOM implementations, we resort to duck-typing. | |||||
| if (!doctype | |||||
| || doctype.nodeType !== doctype.DOCUMENT_TYPE_NODE | |||||
| || typeof doctype.name !== 'string' | |||||
| || typeof doctype.publicId !== 'string' | |||||
| || typeof doctype.systemId !== 'string' | |||||
| ) { | |||||
| throw new TypeError('Expected a DocumentType') | |||||
| } | |||||
| const doctypeString = `<!DOCTYPE ${doctype.name}` | const doctypeString = `<!DOCTYPE ${doctype.name}` | ||||
| + (doctype.publicId ? ` PUBLIC "${doctype.publicId}"` : '') | + (doctype.publicId ? ` PUBLIC "${doctype.publicId}"` : '') | ||||
| + (doctype.systemId | + (doctype.systemId | ||||
+ 4
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test/index.js
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| @@ -17,6 +17,10 @@ test('should return empty string if doctype is null', t => { | |||||
| t.is(doctypeToString(null), '') | t.is(doctypeToString(null), '') | ||||
| }) | }) | ||||
| test('should throw if argument is not a DocumentType', t => { | |||||
| t.throws(() => doctypeToString('a string, for example.'), TypeError) | |||||
| }) | |||||
| test('should work for a HTML5-ish doctype', t => { | test('should work for a HTML5-ish doctype', t => { | ||||
| const doctype = '<!DOCTYPE html>' | const doctype = '<!DOCTYPE html>' | ||||
| const doc = makeStubDocument(doctype) | const doc = makeStubDocument(doctype) | ||||