From 643623dbecdc1ccb6f3ac77e4ebabdc6ca1d8d06 Mon Sep 17 00:00:00 2001
From: Thomas Voss <mail@thomasvoss.com>
Date: Sat, 2 Sep 2023 18:49:53 +0200
Subject: Genesis commit

---
 formatter/formatter.go | 104 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 formatter/formatter.go

(limited to 'formatter/formatter.go')

diff --git a/formatter/formatter.go b/formatter/formatter.go
new file mode 100644
index 0000000..96e19d1
--- /dev/null
+++ b/formatter/formatter.go
@@ -0,0 +1,104 @@
+package formatter
+
+import (
+	"fmt"
+	"unicode"
+
+	"git.thomasvoss.com/gsp/parser"
+)
+
+var stringEscapes = map[rune]string{
+	'"': "&quot;",
+	'&': "&amp;",
+	'<': "&lt;",
+}
+
+func PrintHtml(ast parser.AstNode) {
+	if ast.Type == parser.Text {
+		fmt.Print(ast.Text)
+		return
+	}
+
+	if ast.Type == parser.Normal {
+		fmt.Printf("<%s", ast.Text)
+
+		// Classes are grouped together with ‘class="…"’, so we need
+		// special handling.
+		classes := []string{}
+		notClasses := []parser.Attr{}
+
+		for _, a := range ast.Attrs {
+			if a.Key == "class" {
+				classes = append(classes, a.Value)
+			} else {
+				notClasses = append(notClasses, a)
+			}
+		}
+
+		if len(classes) > 0 {
+			fmt.Printf(" class=\"%s", classes[0])
+			for _, c := range classes[1:] {
+				fmt.Printf(" %s", c)
+			}
+			fmt.Print("\"")
+		}
+
+		for _, a := range notClasses {
+			fmt.Printf(" %s", a.Key)
+			if a.Value == "" {
+				break
+			}
+			fmt.Print("=\"")
+			for _, r := range a.Value {
+				if v, ok := stringEscapes[r]; ok {
+					fmt.Print(v)
+				} else {
+					fmt.Printf("%c", r)
+				}
+			}
+			fmt.Print("\"")
+		}
+
+		fmt.Print(">")
+	}
+
+	if len(ast.Children) == 0 {
+		return
+	}
+
+	for i, n := range ast.Children {
+		if n.Type == parser.Text {
+			if i == 0 {
+				n.Text = trimLeftSpaces(n.Text)
+			}
+
+			if i == len(ast.Children)-1 {
+				n.Text = trimRightSpaces(n.Text)
+			}
+		}
+
+		PrintHtml(n)
+	}
+
+	if ast.Type == parser.Normal {
+		fmt.Printf("</%s>", ast.Text)
+	}
+}
+
+func trimLeftSpaces(s string) string {
+	i := 0
+	rs := []rune(s)
+	for i < len(s) && unicode.IsSpace(rs[i]) {
+		i++
+	}
+	return string(rs[i:])
+}
+
+func trimRightSpaces(s string) string {
+	rs := []rune(s)
+	i := len(rs) - 1
+	for i >= 0 && unicode.IsSpace(rs[i]) {
+		i--
+	}
+	return string(rs[:i+1])
+}
-- 
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