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Create serialize-doctype.ts

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Jun 2022-02-24 15:51:22 -08:00 committed by GitHub
parent 185ea7b9f5
commit 9103ae2f66
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1 changed files with 49 additions and 0 deletions
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src/dom/serialize-doctype.ts Normal file
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/// <reference types="trusted-types"/>
const htmlEscape = (str: string | null): string => {
if (!str)
return '';
const escaped = [];
str.split('').forEach(char => {
if (char == '&') {
char = '&amp;';
} else if (char == '\'') {
char = '&#039;';
} else if (char == '"') {
char = '&quot;';
} else if (char == '<') {
char = '&lt;';
} else if (char == '>') {
char = '&gt;';
}
escaped.push(char);
});
return escaped.join('');
}
const docRule: TrustedTypePolicyOptions = {
createHTML: (ignored: string, doctype?: DocumentType | null): string => {
if (!doctype)
return '<html></html>';
const name = htmlEscape(doctype.name);
const internalSubset = htmlEscape(doctype.internalSubset);
const publicId = `"${htmlEscape(doctype.publicId)}"`;
const systemId = `"${htmlEscape(doctype.systemId)}"`;
return `<!DOCTYPE ${name}${internalSubset}${publicId}${systemId}><html></html>`;
}
}
let doctypePolicy: TrustedTypePolicy | TrustedTypePolicyOptions;
if ((window as any).trustedTypes) {
doctypePolicy = (window as any).trustedTypes.createPolicy('html2canvas', docRule);
} else {
doctypePolicy = docRule;
}
export const serializeDoctype = (doctype?: DocumentType | null): string => {
doctypePolicy.createHTML('', doctype);
}