Create conv.js

md2anki 的 JS 脚本部分

md2anki/conv.js

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+// 定义正则替换函数, 注意是全局替换.
+function regexRepl(orig_str, regex_str, subst_str) {
+	const regex = new RegExp(regex_str, 'g');
+	return orig_str.replace(regex, subst_str);
+}
+
+// 对多行文本内容做必要的预处理
+function preProcess(text) {
+	let res_str = text;
+	res_str = regexRepl(res_str.trim(), '^[\r\n]+', '');
+	res_str = regexRepl(res_str.trim(), '[\r\n]+$', '');
+	res_str = regexRepl(res_str.trim(), '[\r\n]+', '\n');
+	return res_str;
+}
+
+// 从给定的 outline 中查找某级别的上级节点
+// 注意是按照从下往上的顺序查找, 找到第一个就停止寻找
+function findParent(outline, child_level) {
+	let parent_idx = -1;
+	for (let idx = outline.length - 1; idx >= 0; idx--) {
+		if (outline[idx].level == child_level - 1) {
+			parent_idx = idx;
+			break;
+		}
+	}
+	return parent_idx;
+}
+
+// 从给定的 outline 中找到某节点的父节点
+// 并返回该父节点的名称
+function getParentTitle(outline, child_title) {
+	let parent_title = "";
+	for (let item of outline) {
+		if (item.hasOwnProperty('children') && 
+			item.children.indexOf(child_title) >= 0) {
+			parent_title = item.title;
+			break;
+		}
+	}
+	return parent_title;
+}
+
+// 把用户输入的原始文本转换为 outline 对象以便做后续处理
+function text2Outline(text) {
+	let clean_text = preProcess(text);
+	let lines = clean_text.split("\n");  
+	let outline = [];
+
+	const level_regex = new RegExp('#+');
+
+	for (let idx in lines) {
+		let results = level_regex.exec(lines[idx]);
+		let level = results[0].length;
+		let title = lines[idx].replace(results[0], '').trim();
+		let parent_idx = findParent(outline, level);
+		if (parent_idx !== -1) {
+				outline[parent_idx].children.push(title);
+		}
+		outline[idx] = { 'level': level, 'title': title, 'children': [] };
+	}
+	return outline;
+}
+
+// 对单行内容做 markdown 语法解析, 并转换为 HTML 格式
+function markdown2HTML(input_str) {
+	let output_str = "";
+	output_str = regexRepl(input_str, '\\*{2}([^\*]+)\\*{2}', '<b>$1</b>');
+	output_str = regexRepl(output_str, '\\*([^\*]+)\\*', '<span style="background-color:wheat;">$1</span>');
+	output_str = regexRepl(output_str, '\\!\\[[^\[]*\\]\\(([^\(\)]*)\\)', '<img src="$1">');
+	return output_str;
+}
+
+// 对已经转换为 HTML 格式的文本做必要的后处理
+function postProcess(input_str) {
+	let output_str = "";
+	output_str = regexRepl(input_str, '<img src="([^"]+)">(。|；)', '<img src="$1">');
+	output_str = regexRepl(output_str, '？(。|；)', '？');
+	output_str = regexRepl(output_str, '；；', '；');
+	output_str = regexRepl(output_str, '。。', '。');
+	return output_str;
+}
+
+// 获取某项内容在给定的 Outline 中的 XPath
+// 形如 标题1-标题1.1-标题1.1.1
+function getXPathInOutline(outline, item) {
+	let xpath = "";
+	let parent_title = getParentTitle(outline, item.title);
+	while (parent_title.length != 0) {
+		xpath = markdown2HTML(parent_title) + "-" + xpath;
+		parent_title = getParentTitle(outline, parent_title);
+	}
+	return xpath;
+}
+
+function getNthLevelXPath(xpath, num) {
+	let nth_level_xpath = "";
+	let tmp_list = xpath.split('-').slice(0, num);
+	nth_level_xpath = tmp_list.join('-');
+	return nth_level_xpath;
+}
+
+function getAnkiChapterInfo(item, xpath) {
+	let anki_chap_info = "";
+	if (item.level <= 2) {
+		anki_chap_info = '《' + xpath + markdown2HTML(item.title) + '》';
+	} else {
+		anki_chap_info = '《' + getNthLevelXPath(xpath, 3) + '》';
+	}
+	return anki_chap_info;
+}
+
+function markdown2QA(markdown_text) {
+	let qa_text = "";
+	let outline = text2Outline(markdown_text);
+
+	for (let item of outline) {
+		let xpath = getXPathInOutline(outline, item);
+		if (item.children.length > 0 && item.level != 3) {
+			qa_text += '-----\n\n问题：' + item.title + '\n\n' +
+				getAnkiChapterInfo(item, xpath) + '\n\n答案：';
+			for (let child_idx in item.children) {
+				if (child_idx == item.children.length - 1) {
+					qa_text += item.children[child_idx] + '\n\n';
+				} else {
+					qa_text += item.children[child_idx] + '、';
+				}
+			}
+		}
+	}
+	return qa_text;
+}
+
+// 把用户输入的 markdown 文本转换为 Anki 专用导入格式
+function markdown2Anki(markdown_text) {
+	let anki_csv = "";
+	let outline = text2Outline(markdown_text);
+
+	for (let item of outline) {
+		let xpath = getXPathInOutline(outline, item);
+		if (item.children.length > 0 && item.level != 3) {
+			anki_csv += markdown2HTML(item.title) + '\t' + 
+				markdown2HTML(getAnkiChapterInfo(item, xpath)) + '\t';
+			for (let child_idx in item.children) {
+				if (child_idx == item.children.length - 1) {
+					let tmp_str = markdown2HTML(item.children[child_idx]);
+					anki_csv +=  tmp_str + '。\n';
+				} else {
+					let tmp_str = markdown2HTML(item.children[child_idx]);
+					anki_csv +=  tmp_str + '；<br>';
+				}
+				anki_csv = postProcess(anki_csv);
+			}
+		}
+	}
+	return anki_csv;
+}
+
+function download(filename, text) {
+	var pom = document.createElement('a');
+	pom.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(text));
+	pom.setAttribute('download', filename);
+
+	if (document.createEvent) {
+		var event = document.createEvent('MouseEvents');
+		event.initEvent('click', true, true);
+		pom.dispatchEvent(event);
+	}
+	else {
+		pom.click();
+	}
+}