重构markdown解析器

src/markd/index.wc

@@ -11,6 +11,8 @@
 }
 .markd {
   padding: 10px;
+  // white-space: pre-wrap;
+  // word-wrap: break-word;
 }
 a {
   text-decoration: underline;
@@ -27,6 +29,12 @@ em {
 strong {
   color: nth($cd, 3);
 }
+a {
+  strong,
+  em {
+    color: inherit;
+  }
+}
 em,
 strong,
 del {
@@ -39,18 +47,16 @@ img {
   max-width: 100%;
 }
 
-blockquote {
-  &.md-quote {
+blockquote.md-quote {
   margin: 10px 0;
   padding: 5px 10px;
+  line-height: 1.5;
   border-left: 5px solid nth($ct, 1);
   background: #f2faf7;
   color: nth($cgr, 1);
-
   p {
     margin: 0;
   }
-  }
 }
 
 /* 提醒文本 */
@@ -171,14 +177,13 @@ h6 {
     padding: 0 5px;
   }
   a {
-    visibility: hidden;
-    position: absolute;
-    left: -25px;
-    width: 25px;
-    padding: 0 3px;
-    font-weight: bold;
     text-decoration: none;
-    text-align: center;
+    color: #333;
+
+    &::before {
+      content: '# ';
+      color: nth($ct, 1);
+    }
   }
   &:hover a {
     visibility: visible;
@@ -225,7 +230,12 @@ table {
 }
 
 code.inline {
+  display: inline-block;
+  margin: 0 2px;
+  padding: 0 3px;
   color: nth($co, 3);
+  background: nth($cp, 1);
+  border-radius: 2px;
 }
 </style>
 
@@ -233,7 +243,8 @@ code.inline {
 import $ from '../utils'
 import '../code/index'
 
-import parser from './core'
+// import parser from './core'
+import parser from './parser'
 
 export default class Markd {
   props = {}
@@ -246,7 +257,8 @@ export default class Markd {
   }
 
   mounted() {
-    this.__BOX__.innerHTML = parser.safe(this.textContent)
+    // this.__BOX__.innerHTML = parser.safe(this.textContent)
+    this.__BOX__.innerHTML = parser(this.textContent)
     this.textContent = ''
   }
 }

src/markd/parser.js

@@ -0,0 +1,181 @@
+/**
+ * markdown解析器
+ * @author yutent<yutent@doui.cc>
+ * @date 2020/02/07 17:14:19
+ */
+
+'use strict'
+const HR_LIST = ['=', '-', '_', '*']
+const log = console.log
+
+const Helper = {
+  // 是否分割线
+  isHr(str) {
+    var s = str[0]
+    if (HR_LIST.includes(s)) {
+      return str.startsWith(s.repeat(3))
+    }
+    return false
+  }
+}
+
+const Tool = {
+  // 初始化字符串, 处理多余换行等
+  init(str) {
+    // 去掉\r, 将\t转为空格(2个)
+    str = str.replace(/\r/g, '').replace(/\t/g, '  ')
+    var list = []
+    var lines = str.split('\n')
+    var isCodeBlock = false // 是否代码块
+    var emptyLineLength = 0 //连续空行的数量
+
+    for (let it of lines) {
+      let tmp = it.trim()
+      // 空行
+      if (!tmp) {
+        if (list.length === 0 || (!isCodeBlock && emptyLineLength > 0)) {
+          continue
+        }
+        emptyLineLength++
+        list.push(tmp)
+      } else {
+        emptyLineLength = 0
+        if (tmp.startsWith('```')) {
+          if (isCodeBlock) {
+            list.push('</wc-code>')
+          } else {
+            list.push(tmp.replace(/^```([\w\#\-]*?)$/, '<wc-code lang="$1">'))
+          }
+          isCodeBlock = !isCodeBlock
+        } else {
+          list.push(it)
+        }
+      }
+    }
+    log(list)
+    this.list = list
+    return this
+  },
+
+  parse() {
+    var html = ''
+    var isCodeBlock = false // 是否代码块
+    var emptyLineLength = 0 //连续空行的数量
+    var isBlockquote = false
+    var blockquoteLevel = 0
+    var isParagraph = false
+
+    //
+    for (let it of this.list) {
+      // 空行
+      if (!it) {
+        // 如果是在代码中, 直接拼接, 并加上换行
+        if (isCodeBlock) {
+          html += it + '\n'
+        } else {
+          emptyLineLength++
+
+          // 引用结束
+          if (isBlockquote) {
+            isBlockquote = false
+            html += ''
+            if (emptyLineLength > 0) {
+              while (blockquoteLevel > 0) {
+                emptyLineLength = 0
+                blockquoteLevel--
+                html += '</blockquote>'
+              }
+            }
+            continue
+          }
+
+          //
+          if (isParagraph) {
+            isParagraph = false
+            html += '</p>'
+          } /* else {
+            html += '<br>'
+          } */
+        }
+      } else {
+        // wc-code标签直接拼接
+        if (~it.indexOf('wc-code')) {
+          html += it
+          isCodeBlock = !isCodeBlock
+        } else {
+          // 同上代码块的处理
+          if (isCodeBlock) {
+            html += it + '\n'
+            continue
+          }
+
+          it = it
+            .replace(/`(.*?)`/g, '<code class="inline">$1</code>')
+            .replace(/(\-\-|\*\*)(.*?)\1/g, '<strong>$2</strong>')
+            .replace(/(\-|\*)(.*?)\1/g, '<em>$2</em>')
+            .replace(/\!\[([^]*?)\]\(([^)]*?)\)/g, '<img src="$2" alt="$1">')
+            .replace(/\[([^]*?)\]\(([^)]*?)\)/g, '<a href="$2">$1</a>')
+
+          //
+          if (it.startsWith('>')) {
+            html += it.replace(/^(>+) /, m => {
+              let len = m.trim().length
+              let tmp = ''
+              if (isBlockquote) {
+                // 若之前已经有一个未闭合的引用, 需要减去已有缩进级别, 避免产生新的引用标签
+                len = len - blockquoteLevel
+              } else {
+                blockquoteLevel = len
+              }
+              log('bq: ', blockquoteLevel, it)
+              while (len > 0) {
+                len--
+                tmp += '<blockquote class="md-quote">'
+              }
+              return tmp
+            })
+
+            if (isBlockquote) {
+              html += '<br>'
+            }
+            isParagraph = false
+            isBlockquote = true
+            continue
+          }
+
+          if (isBlockquote) {
+            html += it
+            continue
+          }
+
+          //
+          if (it.startsWith('#')) {
+            isParagraph = false
+            let end = ''
+            html += it.replace(/^#{1,6} /, m => {
+              let level = m.trim().length
+              end = `</a></h${level}>`
+              return `<h${level}><a href="#">`
+            })
+            html += end
+
+            continue
+          }
+
+          // log('it => ', isParagraph, it)
+          if (isParagraph) {
+            html += `${it}<br>`
+          } else {
+            html += `<p>${it}<br>`
+          }
+          isParagraph = true
+        }
+      }
+    }
+    return html
+  }
+}
+
+export default function(str) {
+  return Tool.init(str).parse()
+}