53 lines
1.4 KiB
TypeScript
53 lines
1.4 KiB
TypeScript
/**
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* 字符转置功能
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* 交换光标前后的字符
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*/
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import { EditorSelection, findClusterBreak } from "@codemirror/state";
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import { getNoteBlockFromPos } from "./state";
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/**
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* 交换光标前后的字符
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*/
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export const transposeChars = ({ state, dispatch }: { state: any; dispatch: any }): boolean => {
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if (state.readOnly) {
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return false;
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}
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let changes = state.changeByRange((range: any) => {
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// 防止在代码块的开始或结束位置进行字符转置，因为这会破坏块语法
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const block = getNoteBlockFromPos(state, range.from);
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if (block && (range.from === block.content.from || range.from === block.content.to)) {
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return { range };
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}
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if (!range.empty || range.from == 0 || range.from == state.doc.length) {
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return { range };
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}
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let pos = range.from;
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let line = state.doc.lineAt(pos);
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let from = pos == line.from ? pos - 1 : findClusterBreak(line.text, pos - line.from, false) + line.from;
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let to = pos == line.to ? pos + 1 : findClusterBreak(line.text, pos - line.from, true) + line.from;
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return {
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changes: {
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from,
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to,
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insert: state.doc.slice(pos, to).append(state.doc.slice(from, pos))
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},
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range: EditorSelection.cursor(to)
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};
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});
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if (changes.changes.empty) {
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return false;
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}
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dispatch(state.update(changes, {
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scrollIntoView: true,
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userEvent: "move.character"
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}));
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return true;
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};
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