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feat: provide Fragment component

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Adds a new Fragment component that provides the same functionality as
React.Fragment. See issue #9 for details.

closes issue #9
This commit is contained in:
M. George Hansen 2020-06-04 11:25:34 -07:00
parent c542bc960e
commit 5930d10efc
4 changed files with 43 additions and 4 deletions
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23
src/render.ts
View file

@ -42,6 +42,10 @@ const renderElement = (elem: Element): string => {
};
const startTag = (elem: HTMLElement): string => {
if (elem.tag === "#fragment") {
return "";
}
let output = `<${escapeHtml(elem.tag)}`;
for (const [attrName, attrValue] of Object.entries(elem.attributes)) {
@ -68,7 +72,12 @@ const startTag = (elem: HTMLElement): string => {
return output;
};
const endTag = (elem: HTMLElement): string => `</${escapeHtml(elem.tag)}>`;
const endTag = (elem: HTMLElement): string => {
if (elem.tag === "#fragment") {
return "";
}
return `</${escapeHtml(elem.tag)}>`;
};
/**
* Render a complete HTML page from an HTMLElement. Note that the root element
@ -78,7 +87,17 @@ const endTag = (elem: HTMLElement): string => `</${escapeHtml(elem.tag)}>`;
*
* @return Fully rendered HTML document as a string.
*/
export const renderPage = (rootElem: HTMLElement): string => {
export const renderPage = (rootElem: Element): string => {
if (rootElem == undefined) {
throw new Error(`root page element cannot be null`);
}
if (typeof rootElem !== "object" || !("tag" in rootElem)) {
throw new Error(
`root page element must be a valid HTMLElement, got ${JSON.stringify(
rootElem
)}`
);
}
if (rootElem.tag.toLowerCase() !== "html") {
throw new Error(
`attempted to render page with non-HTML root element ${rootElem.tag}`