start packaging

packages/repl-react/CodeMirror.jsx

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+import React from 'react';
+import { Controlled as CodeMirror2 } from 'react-codemirror2';
+import 'codemirror/mode/javascript/javascript.js';
+import 'codemirror/mode/pegjs/pegjs.js';
+// import 'codemirror/theme/material.css';
+import 'codemirror/lib/codemirror.css';
+import 'codemirror/theme/material.css';
+
+export default function CodeMirror({ value, onChange, onCursor, options, editorDidMount }) {
+  options = options || {
+    mode: 'javascript',
+    theme: 'material',
+    lineNumbers: true,
+    styleSelectedText: true,
+    cursorBlinkRate: 500,
+  };
+  return (
+    <CodeMirror2
+      value={value}
+      options={options}
+      onBeforeChange={onChange}
+      editorDidMount={editorDidMount}
+      onCursor={(editor, data) => onCursor?.(editor, data)}
+    />
+  );
+}
+
+export const markEvent = (editor) => (time, event) => {
+  const locs = event.context.locations;
+  if (!locs || !editor) {
+    return;
+  }
+  const col = event.context?.color || '#FFCA28';
+  // mark active event
+  const marks = locs.map(({ start, end }) =>
+    editor.getDoc().markText(
+      { line: start.line - 1, ch: start.column },
+      { line: end.line - 1, ch: end.column },
+      //{ css: 'background-color: #FFCA28; color: black' } // background-color is now used by parent marking
+      { css: 'outline: 1px solid ' + col + '; box-sizing:border-box' },
+      //{ css: `background-color: ${col};border-radius:5px` },
+    ),
+  );
+  //Tone.Transport.schedule(() => { // problem: this can be cleared by scheduler...
+  setTimeout(() => {
+    marks.forEach((mark) => mark.clear());
+    // }, '+' + event.duration * 0.5);
+  }, event.duration /* * 0.9 */ * 1000);
+};
+
+let parenMark;
+export const markParens = (editor, data) => {
+  const v = editor.getDoc().getValue();
+  const marked = getCurrentParenArea(v, data);
+  parenMark?.clear();
+  parenMark = editor.getDoc().markText(...marked, { css: 'background-color: #00007720' }); //
+};
+
+// returns { line, ch } from absolute character offset
+export function offsetToPosition(offset, code) {
+  const lines = code.split('\n');
+  let line = 0;
+  let ch = 0;
+  for (let i = 0; i < offset; i++) {
+    if (ch === lines[line].length) {
+      line++;
+      ch = 0;
+    } else {
+      ch++;
+    }
+  }
+  return { line, ch };
+}
+
+// returns absolute character offset from { line, ch }
+export function positionToOffset(position, code) {
+  const lines = code.split('\n');
+  let offset = 0;
+  for (let i = 0; i < position.line; i++) {
+    offset += lines[i].length + 1;
+  }
+  offset += position.ch;
+  return offset;
+}
+
+// given code and caret position, the functions returns the indices of the parens we are in
+export function getCurrentParenArea(code, caretPosition) {
+  const caret = positionToOffset(caretPosition, code);
+  let open, i, begin, end;
+  // walk left
+  i = caret;
+  open = 0;
+  while (i > 0) {
+    if (code[i - 1] === '(') {
+      open--;
+    } else if (code[i - 1] === ')') {
+      open++;
+    }
+    if (open === -1) {
+      break;
+    }
+    i--;
+  }
+  begin = i;
+  // walk right
+  i = caret;
+  open = 0;
+  while (i < code.length) {
+    if (code[i] === '(') {
+      open--;
+    } else if (code[i] === ')') {
+      open++;
+    }
+    if (open === 1) {
+      break;
+    }
+    i++;
+  }
+  end = i;
+  return [begin, end].map((o) => offsetToPosition(o, code));
+}