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// Source: https://github.com/julianpoemp/codejar-linenumbers/blob/main/src/codejar-linenumbers.ts
// This class was copied from https://github.com/antonmedv/codejar/blob/3.7.0/linenumbers.ts
// and applied with further improvements and fixes
type Options = {
class: string
wrapClass: string
width: string
backgroundColor: string
color: string
}
export function withLineNumbers(
highlight: (e: HTMLElement) => void,
options: Partial<Options> = {}
) {
const opts: Options = {
class: "codejar-linenumbers",
wrapClass: "codejar-wrap",
width: "35px",
backgroundColor: "rgba(128, 128, 128, 0.15)",
color: "",
...options
}
let lineNumbers: HTMLElement
return function (editor: HTMLElement) {
highlight(editor)
if (!lineNumbers) {
lineNumbers = init(editor, opts)
editor.addEventListener("scroll", () => lineNumbers.style.top = `-${editor.scrollTop}px`);
}
const code = editor.textContent || ""
const linesCount = code.replace(/\n$/g, "").split("\n").length
let text = ""
for (let i = 0; i < linesCount; i++) {
text += `${i + 1}\n`
}
lineNumbers.innerText = text
}
}
function init(editor: HTMLElement, opts: Options): HTMLElement {
const css = getComputedStyle(editor);
const wrap = document.createElement("div")
wrap.className = opts.wrapClass
wrap.style.position = "relative"
const innerWrap = document.createElement("div");
innerWrap.className = "codejar-linenumbers-inner-wrap";
innerWrap.style.background = css.background;
innerWrap.style.marginTop = css.borderTopWidth;
innerWrap.style.marginBottom = css.borderBottomWidth;
innerWrap.style.marginLeft = css.borderLeftWidth;
innerWrap.style.borderTopLeftRadius = css.borderTopLeftRadius;
innerWrap.style.borderBottomLeftRadius = css.borderBottomLeftRadius;
const gutter = document.createElement("div")
gutter.className = opts.class;
innerWrap.appendChild(gutter);
wrap.appendChild(innerWrap)
// Add own styles
gutter.style.width = opts.width
gutter.style.overflow = "hidden"
gutter.style.backgroundColor = opts.backgroundColor
// Copy editor styles
gutter.style.fontFamily = css.fontFamily
gutter.style.fontSize = css.fontSize
gutter.style.lineHeight = css.lineHeight
gutter.style.paddingTop = `calc(${css.paddingTop})`;
gutter.style.paddingLeft = css.paddingLeft
gutter.style.borderTopLeftRadius = css.borderTopLeftRadius
gutter.style.borderBottomLeftRadius = css.borderBottomLeftRadius;
// Add line numbers
const lineNumbers = document.createElement("div");
lineNumbers.setAttribute("class", "codejar-linenumber");
lineNumbers.style.color = opts.color || css.color;
lineNumbers.style.setProperty("mix-blend-mode", "unset");
gutter.appendChild(lineNumbers)
// Tweak editor styles
editor.style.paddingLeft = `calc(${opts.width} + ${gutter.style.paddingLeft} + 5px)`
editor.style.whiteSpace = "pre"
// Swap editor with a wrap
editor.parentNode!.insertBefore(wrap, editor)
wrap.appendChild(editor)
return lineNumbers
}
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