feat(renderer): render external links (#48)

Signed-off-by: Xavier Coulon <xcoulon@redhat.com>

renderer/html5/external_link.go

@@ -0,0 +1,28 @@
+package html5
+
+import (
+	"bytes"
+	"html/template"
+
+	"github.com/bytesparadise/libasciidoc/renderer"
+	"github.com/bytesparadise/libasciidoc/types"
+	"github.com/pkg/errors"
+	log "github.com/sirupsen/logrus"
+)
+
+var externalLinkTmpl *template.Template
+
+// initializes the templates
+func init() {
+	externalLinkTmpl = newHTMLTemplate("external link", `<a href="{{ .URL }}">{{ .Text }}</a>`)
+}
+
+func renderExternalLink(ctx *renderer.Context, l *types.ExternalLink) ([]byte, error) {
+	result := bytes.NewBuffer(nil)
+	err := externalLinkTmpl.Execute(result, l)
+	if err != nil {
+		return nil, errors.Wrapf(err, "unable to render external link")
+	}
+	log.Debugf("rendered external link: %s", result.Bytes())
+	return result.Bytes(), nil
+}

renderer/html5/external_link_test.go

@@ -0,0 +1,17 @@
+package html5_test
+
+import . "github.com/onsi/ginkgo"
+
+var _ = Describe("Links", func() {
+	Context("External links", func() {
+
+		It("External link alone", func() {
+
+			actualContent := "https://foo.com[the website]"
+			expected := `<div class="paragraph">
+<p><a href="https://foo.com">the website</a></p>
+</div>`
+			verify(GinkgoT(), expected, actualContent)
+		})
+	})
+})

renderer/html5/renderer.go

@@ -35,25 +35,27 @@ func renderElement(ctx *renderer.Context, element types.DocElement) ([]byte, err
 	case *types.Passthrough:
 		return renderPassthrough(ctx, e)
 	case *types.BlockImage:
-		return renderBlockImage(ctx, element.(*types.BlockImage))
+		return renderBlockImage(ctx, e)
 	case *types.InlineImage:
-		return renderInlineImage(ctx, element.(*types.InlineImage))
+		return renderInlineImage(ctx, e)
 	case *types.DelimitedBlock:
-		return renderDelimitedBlock(ctx, element.(*types.DelimitedBlock))
+		return renderDelimitedBlock(ctx, e)
 	case *types.LiteralBlock:
-		return renderLiteralBlock(ctx, element.(*types.LiteralBlock))
+		return renderLiteralBlock(ctx, e)
 	case *types.InlineContent:
-		return renderInlineContent(ctx, element.(*types.InlineContent))
+		return renderInlineContent(ctx, e)
+	case *types.ExternalLink:
+		return renderExternalLink(ctx, e)
 	case *types.StringElement:
-		return renderStringElement(ctx, element.(*types.StringElement))
+		return renderStringElement(ctx, e)
 	case *types.DocumentAttributeDeclaration:
 		// 'process' function do not return any rendered content, but may return an error
-		return nil, processAttributeDeclaration(ctx, element.(*types.DocumentAttributeDeclaration))
+		return nil, processAttributeDeclaration(ctx, e)
 	case *types.DocumentAttributeReset:
 		// 'process' function do not return any rendered content, but may return an error
-		return nil, processAttributeReset(ctx, element.(*types.DocumentAttributeReset))
+		return nil, processAttributeReset(ctx, e)
 	case *types.DocumentAttributeSubstitution:
-		return renderAttributeSubstitution(ctx, element.(*types.DocumentAttributeSubstitution))
+		return renderAttributeSubstitution(ctx, e)
 	default:
 		return nil, errors.Errorf("unsupported type of element: %T", element)
 	}