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<script lang="ts">
import type { ViewUpdate } from "@codemirror/view";
import { createEventDispatcher, onMount } from "svelte";
import {
EditorView,
keymap,
placeholder as placeholderExt
} from "@codemirror/view";
import { StateEffect, EditorState, type Extension } from "@codemirror/state";
import { indentWithTab } from "@codemirror/commands";
import { basicDark } from "cm6-theme-basic-dark";
import { basicLight } from "cm6-theme-basic-light";
import { basicSetup } from "./extensions";
import { getLanguageExtension } from "./language";
export let classNames = "";
export let value = "";
export let dark_mode: boolean;
export let basic = true;
export let language: string;
export let lines = 5;
export let extensions: Extension[] = [];
export let useTab = true;
export let readonly = false;
export let placeholder: string | HTMLElement | null | undefined = undefined;
const dispatch = createEventDispatcher<{
change: string;
blur: undefined;
focus: undefined;
}>();
let lang_extension: Extension | undefined;
let element: HTMLDivElement;
let view: EditorView;
$: get_lang(language);
async function get_lang(val: string): Promise<void> {
const ext = await getLanguageExtension(val);
lang_extension = ext;
}
$: reconfigure(), lang_extension;
$: setDoc(value);
$: updateLines();
function setDoc(newDoc: string): void {
if (view && newDoc !== view.state.doc.toString()) {
view.dispatch({
changes: {
from: 0,
to: view.state.doc.length,
insert: newDoc
}
});
}
}
function updateLines(): void {
if (view) {
view.requestMeasure({ read: updateGutters });
}
}
function createEditorView(): EditorView {
const editorView = new EditorView({
parent: element,
state: createEditorState(value)
});
editorView.dom.addEventListener("focus", handleFocus, true);
editorView.dom.addEventListener("blur", handleBlur, true);
return editorView;
}
function handleFocus(): void {
dispatch("focus");
}
function handleBlur(): void {
dispatch("blur");
}
function getGutterLineHeight(_view: EditorView): string | null {
let elements = _view.dom.querySelectorAll<HTMLElement>(".cm-gutterElement");
if (elements.length === 0) {
return null;
}
for (var i = 0; i < elements.length; i++) {
let node = elements[i];
let height = getComputedStyle(node)?.height ?? "0px";
if (height != "0px") {
return height;
}
}
return null;
}
function updateGutters(_view: EditorView): any {
let gutters = _view.dom.querySelectorAll<HTMLElement>(".cm-gutter");
let _lines = lines + 1;
let lineHeight = getGutterLineHeight(_view);
if (!lineHeight) {
return null;
}
for (var i = 0; i < gutters.length; i++) {
let node = gutters[i];
node.style.minHeight = `calc(${lineHeight} * ${_lines})`;
}
return null;
}
function handleChange(vu: ViewUpdate): void {
if (vu.docChanged) {
const doc = vu.state.doc;
const text = doc.toString();
value = text;
dispatch("change", text);
}
view.requestMeasure({ read: updateGutters });
}
function getExtensions(): Extension[] {
const stateExtensions = [
...getBaseExtensions(
basic,
useTab,
placeholder,
readonly,
lang_extension
),
FontTheme,
...getTheme(),
...extensions
];
return stateExtensions;
}
const FontTheme = EditorView.theme({
"&": {
fontSize: "var(--text-sm)",
backgroundColor: "var(--border-color-secondary)"
},
".cm-content": {
paddingTop: "5px",
paddingBottom: "5px",
color: "var(--body-text-color)",
fontFamily: "var(--font-mono)",
minHeight: "100%"
},
".cm-gutters": {
marginRight: "1px",
borderRight: "1px solid var(--border-color-primary)",
backgroundColor: "transparent",
color: "var(--body-text-color-subdued)"
},
".cm-focused": {
outline: "none"
},
".cm-scroller": {
height: "auto"
},
".cm-cursor": {
borderLeftColor: "var(--body-text-color)"
}
});
function createEditorState(_value: string | null | undefined): EditorState {
return EditorState.create({
doc: _value ?? undefined,
extensions: getExtensions()
});
}
function getBaseExtensions(
basic: boolean,
useTab: boolean,
placeholder: string | HTMLElement | null | undefined,
readonly: boolean,
lang: Extension | null | undefined
): Extension[] {
const extensions: Extension[] = [
EditorView.editable.of(!readonly),
EditorState.readOnly.of(readonly),
EditorView.contentAttributes.of({ "aria-label": "Code input container" })
];
if (basic) {
extensions.push(basicSetup);
}
if (useTab) {
extensions.push(keymap.of([indentWithTab]));
}
if (placeholder) {
extensions.push(placeholderExt(placeholder));
}
if (lang) {
extensions.push(lang);
}
extensions.push(EditorView.updateListener.of(handleChange));
return extensions;
}
function getTheme(): Extension[] {
const extensions: Extension[] = [];
if (dark_mode) {
extensions.push(basicDark);
} else {
extensions.push(basicLight);
}
return extensions;
}
function reconfigure(): void {
view?.dispatch({
effects: StateEffect.reconfigure.of(getExtensions())
});
}
onMount(() => {
view = createEditorView();
return () => view?.destroy();
});
</script>
<div class="wrap">
<div class="codemirror-wrapper {classNames}" bind:this={element} />
</div>
<style>
.wrap {
display: flex;
flex-direction: column;
flex-flow: column;
margin: 0;
padding: 0;
height: 100%;
}
.codemirror-wrapper {
height: 100%;
overflow: auto;
}
:global(.cm-editor) {
height: 100%;
}
/* Dunno why this doesn't work through the theme API -- don't remove*/
:global(.cm-selectionBackground) {
background-color: #b9d2ff30 !important;
}
:global(.cm-focused) {
outline: none !important;
}
</style>
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