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components/gaoyia-parse/libs/html2json.js

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+/**
+ * html2Json 改造来自: https://github.com/Jxck/html2json
+ *
+ *
+ * author: Di (微信小程序开发工程师)
+ * organization: WeAppDev(微信小程序开发论坛)(http://weappdev.com)
+ *               垂直微信小程序开发交流社区
+ *
+ * github地址: https://github.com/icindy/wxParse
+ *
+ * for: 微信小程序富文本解析
+ * detail : http://weappdev.com/t/wxparse-alpha0-1-html-markdown/184
+ */
+
+import wxDiscode from "./wxDiscode";
+import HTMLParser from "./htmlparser";
+
+function makeMap(str) {
+  const obj = {};
+  const items = str.split(",");
+  for (let i = 0; i < items.length; i += 1) obj[items[i]] = true;
+  return obj;
+}
+
+// Block Elements - HTML 5
+const block = makeMap(
+  "br,code,address,article,applet,aside,audio,blockquote,button,canvas,center,dd,del,dir,div,dl,dt,fieldset,figcaption,figure,footer,form,frameset,h1,h2,h3,h4,h5,h6,header,hgroup,hr,iframe,ins,isindex,li,map,menu,noframes,noscript,object,ol,output,p,pre,section,script,table,tbody,td,tfoot,th,thead,tr,ul,video",
+);
+
+// Inline Elements - HTML 5
+const inline = makeMap(
+  "a,abbr,acronym,applet,b,basefont,bdo,big,button,cite,del,dfn,em,font,i,iframe,img,input,ins,kbd,label,map,object,q,s,samp,script,select,small,span,strike,strong,sub,sup,textarea,tt,u,var",
+);
+
+// Elements that you can, intentionally, leave open
+// (and which close themselves)
+const closeSelf = makeMap("colgroup,dd,dt,li,options,p,td,tfoot,th,thead,tr");
+
+function removeDOCTYPE(html) {
+  const isDocument = /<body.*>([^]*)<\/body>/.test(html);
+  return isDocument ? RegExp.$1 : html;
+}
+
+function trimHtml(html) {
+  return html
+    .replace(/<!--.*?-->/gi, "")
+    .replace(/\/\*.*?\*\//gi, "")
+    .replace(/[ ]+</gi, "<")
+    .replace(/<script[^]*<\/script>/gi, "")
+    .replace(/<style[^]*<\/style>/gi, "");
+}
+
+function getScreenInfo() {
+  const screen = {};
+  wx.getSystemInfo({
+    success: (res) => {
+      screen.width = res.windowWidth;
+      screen.height = res.windowHeight;
+    },
+  });
+  return screen;
+}
+
+function html2json(html, customHandler, imageProp, host) {
+  // 处理字符串
+  html = removeDOCTYPE(html);
+  html = trimHtml(html);
+  html = wxDiscode.strDiscode(html);
+  // 生成node节点
+  const bufArray = [];
+  const results = {
+    nodes: [],
+    imageUrls: [],
+  };
+
+  const screen = getScreenInfo();
+  function Node(tag) {
+    this.node = "element";
+    this.tag = tag;
+
+    this.$screen = screen;
+  }
+
+  HTMLParser(html, {
+    start(tag, attrs, unary) {
+      // node for this element
+      const node = new Node(tag);
+
+      if (bufArray.length !== 0) {
+        const parent = bufArray[0];
+        if (parent.nodes === undefined) {
+          parent.nodes = [];
+        }
+      }
+
+      if (block[tag]) {
+        node.tagType = "block";
+      } else if (inline[tag]) {
+        node.tagType = "inline";
+      } else if (closeSelf[tag]) {
+        node.tagType = "closeSelf";
+      }
+
+      node.attr = attrs.reduce((pre, attr) => {
+        const { name } = attr;
+        let { value } = attr;
+        if (name === "class") {
+          node.classStr = value;
+        }
+        // has multi attibutes
+        // make it array of attribute
+        if (name === "style") {
+          node.styleStr = value;
+        }
+        if (value.match(/ /)) {
+          value = value.split(" ");
+        }
+
+        // if attr already exists
+        // merge it
+        if (pre[name]) {
+          if (Array.isArray(pre[name])) {
+            // already array, push to last
+            pre[name].push(value);
+          } else {
+            // single value, make it array
+            pre[name] = [pre[name], value];
+          }
+        } else {
+          // not exist, put it
+          pre[name] = value;
+        }
+
+        return pre;
+      }, {});
+
+      // 优化样式相关属性
+      if (node.classStr) {
+        node.classStr += ` ${node.tag}`;
+      } else {
+        node.classStr = node.tag;
+      }
+      if (node.tagType === "inline") {
+        node.classStr += " inline";
+      }
+
+      // 对img添加额外数据
+      if (node.tag === "img") {
+        let imgUrl = node.attr.src;
+        imgUrl = wxDiscode.urlToHttpUrl(imgUrl, imageProp.domain);
+        Object.assign(node.attr, imageProp, {
+          src: imgUrl || "",
+        });
+        if (imgUrl) {
+          results.imageUrls.push(imgUrl);
+        }
+      }
+
+      // 处理a标签属性
+      if (node.tag === "a") {
+        node.attr.href = node.attr.href || "";
+      }
+
+      // 处理font标签样式属性
+      if (node.tag === "font") {
+        const fontSize = [
+          "x-small",
+          "small",
+          "medium",
+          "large",
+          "x-large",
+          "xx-large",
+          "-webkit-xxx-large",
+        ];
+        const styleAttrs = {
+          color: "color",
+          face: "font-family",
+          size: "font-size",
+        };
+        if (!node.styleStr) node.styleStr = "";
+        Object.keys(styleAttrs).forEach((key) => {
+          if (node.attr[key]) {
+            const value =
+              key === "size" ? fontSize[node.attr[key] - 1] : node.attr[key];
+            node.styleStr += `${styleAttrs[key]}: ${value};`;
+          }
+        });
+      }
+
+      // 临时记录source资源
+      if (node.tag === "source") {
+        results.source = node.attr.src;
+      }
+
+      if (customHandler.start) {
+        customHandler.start(node, results);
+      }
+
+      if (unary) {
+        // if this tag doesn't have end tag
+        // like <img src="hoge.png"/>
+        // add to parents
+        const parent = bufArray[0] || results;
+        if (parent.nodes === undefined) {
+          parent.nodes = [];
+        }
+        parent.nodes.push(node);
+      } else {
+        bufArray.unshift(node);
+      }
+    },
+    end(tag) {
+      // merge into parent tag
+      const node = bufArray.shift();
+      if (node.tag !== tag) {
+        console.error("invalid state: mismatch end tag");
+      }
+
+      // 当有缓存source资源时于于video补上src资源
+      if (node.tag === "video" && results.source) {
+        node.attr.src = results.source;
+        delete results.source;
+      }
+
+      if (customHandler.end) {
+        customHandler.end(node, results);
+      }
+
+      if (bufArray.length === 0) {
+        results.nodes.push(node);
+      } else {
+        const parent = bufArray[0];
+        if (!parent.nodes) {
+          parent.nodes = [];
+        }
+        parent.nodes.push(node);
+      }
+    },
+    chars(text) {
+      if (!text.trim()) return;
+
+      const node = {
+        node: "text",
+        text,
+      };
+
+      if (customHandler.chars) {
+        customHandler.chars(node, results);
+      }
+
+      if (bufArray.length === 0) {
+        results.nodes.push(node);
+      } else {
+        const parent = bufArray[0];
+        if (parent.nodes === undefined) {
+          parent.nodes = [];
+        }
+        parent.nodes.push(node);
+      }
+    },
+  });
+
+  return results;
+}
+
+export default html2json;