Method findPrevious

src/code_view.ts:291–347

()

	}

	private findPrevious() {
		const query = this.getQuery();
		if (!query.search) return;

		const { from } = this.view.state.selection.main;
		const searchString = this.view.state.doc.toString();

		try {
			let searchPos = from;

			// 创建正则表达式用于搜索
			let regex: RegExp;
			const flags = query.caseSensitive ? "g" : "gi";
			const pattern = query.regexp ? query.search : this.escapeRegex(query.search);

			if (query.wholeWord) {
				regex = new RegExp(`\\b${pattern}\\b`, flags);
			} else {
				regex = new RegExp(pattern, flags);
			}

			// 从当前位置向后查找
			let lastMatch: { from: number; to: number } | null = null;
			let execResult: RegExpExecArray | null;

			while ((execResult = regex.exec(searchString)) !== null) {
				if (execResult.index < searchPos) {
					lastMatch = { from: execResult.index, to: execResult.index + execResult[0].length };
				} else {
					break;
				}
			}

			if (lastMatch) {
				this.view.dispatch({
					selection: { anchor: lastMatch.from, head: lastMatch.to },
					effects: [EditorView.scrollIntoView(lastMatch.from, { x: "nearest", y: "center" })]
				});
			} else {
				// 循环搜索：如果前面没有匹配项，找到文档中的最后一个匹配项
				regex.lastIndex = 0;
				let finalMatch: { from: number; to: number } | null = null;
				while ((execResult = regex.exec(searchString)) !== null) {
					finalMatch = { from: execResult.index, to: execResult.index + execResult[0].length };
				}

				if (finalMatch) {
					this.view.dispatch({
						selection: { anchor: finalMatch.from, head: finalMatch.to },
						effects: [EditorView.scrollIntoView(finalMatch.from, { x: "nearest", y: "center" })]
					});
				}
			}
		} catch (error) {
			console.error("Search error:", error);
		}
	}