all: support multi line attribute values

If the attribute value end with backslash '\', the value continue to the
next line.

1 files changed, 47 insertions, 0 deletions

diff --git a/document_test.go b/document_test.go
index a6f60e7..42e9b03 100644
--- a/document_test.go
+++ b/document_test.go
@@ -4,6 +4,7 @@
 package asciidoctor
 
 import (
+	"bytes"
 	"os"
 	"testing"
 
@@ -94,3 +95,49 @@ func TestParse_document_title(t *testing.T) {
 		test.Assert(t, `String`, c.expString, got.Title.String())
 	}
 }
+
+func TestDocument_ToHTML(t *testing.T) {
+	type testCase struct {
+		name        string
+		fileAdoc    string
+		fileExpHtml string
+	}
+
+	var (
+		cases = []testCase{{
+			name:        `header`,
+			fileAdoc:    `testdata/html/header.adoc`,
+			fileExpHtml: `testdata/html/header.exp.html`,
+		}}
+
+		c   testCase
+		doc *Document
+		err error
+		got bytes.Buffer
+		exp []byte
+	)
+
+	for _, c = range cases {
+		doc, err = Open(c.fileAdoc)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		// Since we cannot overwrite the asciidoctor output for
+		// generator, we override ourself.
+		doc.Attributes[MetaNameGenerator] = `Asciidoctor 2.0.18`
+
+		got.Reset()
+
+		err = doc.ToHTML(&got)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		exp, err = os.ReadFile(c.fileExpHtml)
+		if err != nil {
+			t.Fatal(err)
+		}
+		test.Assert(t, c.name, string(exp), got.String())
+	}
+}