feat: 标题、链接、图片、文本（加粗、倾斜）、代码块的解析和格式化

format/format.go

@@ -0,0 +1,94 @@
+package format
+
+import (
+	"strconv"
+
+	"github.com/fengxxc/wechatmp2markdown/parse"
+)
+
+func Format(article parse.Article) string {
+	var result string
+	var titleMdStr string = formatTitle(article.Title)
+	result += titleMdStr
+	var metaMdStr string = formatMeta(article.Meta)
+	result += metaMdStr
+	var tagsMdStr string = formatTags(article.Tags)
+	result += tagsMdStr
+	var content string = formatContent(article.Content)
+	result += content
+	return result
+}
+
+func formatTitle(piece parse.Piece) string {
+	var prefix string
+	level, _ := strconv.Atoi(piece.Attrs["level"])
+	for i := 0; i < level; i++ {
+		prefix += "#"
+	}
+	return prefix + " " + piece.Val.(string) + "  \n"
+}
+
+func formatMeta(meta string) string {
+	return meta + "  \n" // TODO
+}
+
+func formatTags(tags string) string {
+	return tags + "  \n" // TODO
+}
+
+func formatContent(blocks []parse.Paragraph) string {
+	var contentMdStr string
+	for _, block := range blocks {
+		for _, piece := range block.Pieces {
+			var pieceMdStr string
+			switch piece.Type {
+			case parse.HEADER:
+				pieceMdStr = formatTitle(piece)
+			case parse.LINK:
+				pieceMdStr = formatLink(piece)
+			case parse.NORMAL_TEXT:
+				pieceMdStr = piece.Val.(string)
+			case parse.BOLD_TEXT:
+				pieceMdStr = "**" + piece.Val.(string) + "**"
+			case parse.ITALIC_TEXT:
+				pieceMdStr = "*" + piece.Val.(string) + "*"
+			case parse.BOLD_ITALIC_TEXT:
+				pieceMdStr = "***" + piece.Val.(string) + "***"
+			case parse.IMAGE:
+				pieceMdStr = formatImage(piece)
+			case parse.TABLE:
+				// TODO
+			case parse.CODE_INLINE:
+			case parse.CODE_BLOCK:
+				pieceMdStr = formatCodeBlock(piece)
+			case parse.BLOCK_QUOTES:
+			case parse.O_LIST:
+			case parse.U_LIST:
+			case parse.HR:
+			}
+			contentMdStr += pieceMdStr
+		}
+		contentMdStr += "  \n"
+	}
+	return contentMdStr
+}
+
+func formatCodeBlock(piece parse.Piece) string {
+	var codeMdStr string
+	codeMdStr += "```\n"
+	codeRows := piece.Val.([]string)
+	for _, row := range codeRows {
+		codeMdStr += row + "\n"
+	}
+	codeMdStr += "```  \n"
+	return codeMdStr
+}
+
+func formatImage(piece parse.Piece) string {
+	return "![" + piece.Attrs["alt"] + "](" + piece.Attrs["src"] + " \"" + piece.Attrs["title"] + "\")"
+}
+
+func formatLink(piece parse.Piece) string {
+	var linkMdStr string = "[" + piece.Val.(string) + "](" + piece.Attrs["href"] + ")"
+	return linkMdStr
+}