1 files changed, 101 insertions, 0 deletions
diff --git a/markdown/ast_paragraph.go b/markdown/ast_paragraph.go
new file mode 100644
index 0000000..8b34e9f
--- /dev/null
+++ b/markdown/ast_paragraph.go
@@ -0,0 +1,101 @@
+package markdown
+
+import (
+	"errors"
+	"fmt"
+	"html/template"
+)
+
+var (
+	ErrInvalidParagraph = errors.New("invalid paragraph")
+)
+
+type astParagraph struct {
+	content []block
+	oneLine bool
+}
+
+func (a *astParagraph) Eval() (template.HTML, *ParseError) {
+	var content template.HTML
+	for _, c := range a.content {
+		ct, err := c.Eval()
+		if err != nil {
+			return "", err
+		}
+		content += ct
+	}
+	if a.oneLine {
+		return content, nil
+	}
+	return template.HTML(fmt.Sprintf("<p>%s</p>", trimSpace(content))), nil
+}
+
+func paragraph(lxs *lexers, oneLine bool) (*astParagraph, *ParseError) {
+	tree := new(astParagraph)
+	tree.oneLine = oneLine
+	maxBreak := 2
+	if oneLine {
+		maxBreak = 1
+	}
+	n := 0
+	lxs.current-- // because we do not use it before the next
+	for lxs.Next() && n < maxBreak {
+		switch lxs.Current().Type {
+		case lexerBreak:
+			n += len(lxs.Current().Value)
+		case lexerQuote, lexerList:
+			if n > 0 {
+				lxs.Before() // because we did not use it
+				return tree, nil
+			}
+			tree.content = append(tree.content, astLiteral(lxs.Current().Value))
+		case lexerLiteral, lexerHeader:
+			s := lxs.Current().Value
+			// replace line break by space
+			if n > 0 {
+				s = " " + s
+			}
+			n = 0
+			tree.content = append(tree.content, astLiteral(s))
+		case lexerModifier:
+			n = 0
+			mod, err := modifier(lxs)
+			if err != nil {
+				return nil, &ParseError{lxs: *lxs, internal: err}
+			}
+			tree.content = append(tree.content, mod)
+		case lexerExternal:
+			n = 0
+			if lxs.Current().Value == "!" {
+				tree.content = append(tree.content, astLiteral(lxs.Current().Value))
+			} else {
+				ext, err := external(lxs)
+				if err != nil {
+					return nil, err
+				}
+				tree.content = append(tree.content, ext)
+			}
+		case lexerCode:
+			if len(lxs.Current().Value) > 1 {
+				return nil, &ParseError{lxs: *lxs, internal: ErrInvalidCodeBlockPosition}
+			}
+			n = 0
+			b, err := code(lxs)
+			if err != nil {
+				return nil, err
+			}
+			tree.content = append(tree.content, b)
+			return tree, nil
+		}
+	}
+	if !lxs.Finished() {
+		lxs.Before() // because we never handle the last item
+	}
+	return tree, nil
+}
+
+type astLiteral string
+
+func (a astLiteral) Eval() (template.HTML, *ParseError) {
+	return template.HTML(template.HTMLEscapeString(string(a))), nil
+}