repochecker/grammalecte: Check resolution.md

repochecker/grammalecte/void/renderer.go

@@ -0,0 +1,135 @@
+package void
+
+import (
+	"bytes"
+	"fmt"
+
+	"github.com/yuin/goldmark/ast"
+	goldrender "github.com/yuin/goldmark/renderer"
+	"github.com/yuin/goldmark/renderer/html"
+	"github.com/yuin/goldmark/util"
+)
+
+type VoidRenderer struct {
+	Writer html.Writer
+	errs   []error
+}
+
+func NewVoidRenderer() *VoidRenderer {
+	return &VoidRenderer{
+		Writer: html.DefaultWriter,
+	}
+}
+
+// RegisterFuncs implements NodeRenderer.RegisterFuncs .
+func (r *VoidRenderer) RegisterFuncs(reg goldrender.NodeRendererFuncRegisterer) {
+	reg.Register(ast.KindParagraph, r.renderParagraph)
+	reg.Register(ast.KindAutoLink, r.renderAutoLink)
+	reg.Register(ast.KindCodeSpan, r.renderCodeSpan)
+	reg.Register(ast.KindRawHTML, r.renderRawHTML)
+	reg.Register(ast.KindImage, r.renderImage)
+	reg.Register(ast.KindText, r.renderText)
+	reg.Register(ast.KindString, r.renderString)
+}
+
+func (r *VoidRenderer) Errors() []error {
+	return r.errs
+}
+
+func (r *VoidRenderer) renderParagraph(w util.BufWriter, source []byte, n ast.Node, entering bool) (ast.WalkStatus, error) {
+	_, _ = w.WriteString("\n")
+	return ast.WalkContinue, nil
+}
+
+func (r *VoidRenderer) renderAutoLink(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
+	if !entering {
+		return ast.WalkContinue, nil
+	}
+
+	_, _ = w.WriteString(`lien hypertexte`)
+	return ast.WalkContinue, nil
+}
+
+func (r *VoidRenderer) renderCodeSpan(w util.BufWriter, source []byte, n ast.Node, entering bool) (ast.WalkStatus, error) {
+	if !entering {
+		return ast.WalkContinue, nil
+	}
+
+	_, _ = w.WriteString(`code remplacé`)
+	return ast.WalkSkipChildren, nil
+}
+
+func (r *VoidRenderer) renderRawHTML(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
+	if !entering {
+		return ast.WalkContinue, nil
+	}
+
+	_, _ = w.WriteString(`bloc HTML remplacé`)
+	return ast.WalkSkipChildren, nil
+}
+
+func (r *VoidRenderer) renderImage(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
+	if !entering {
+		_, _ = w.WriteString(`.`)
+		return ast.WalkContinue, nil
+	}
+	n := node.(*ast.Image)
+
+	// Check there is a correct image alt
+	alt := nodeToText(n, source)
+	if len(bytes.Fields(alt)) <= 1 {
+		r.errs = append(r.errs, fmt.Errorf("No valid image alternative defined for %q", n.Destination))
+		return ast.WalkContinue, nil
+	}
+
+	return ast.WalkContinue, nil
+}
+
+func nodeToText(n ast.Node, source []byte) []byte {
+	var buf bytes.Buffer
+	for c := n.FirstChild(); c != nil; c = c.NextSibling() {
+		if s, ok := c.(*ast.String); ok && s.IsCode() {
+			buf.Write(s.Text(source))
+		} else if !c.HasChildren() {
+			buf.Write(util.EscapeHTML(c.Text(source)))
+		} else {
+			buf.Write(nodeToText(c, source))
+		}
+	}
+	return buf.Bytes()
+}
+
+func (r *VoidRenderer) renderText(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
+	if !entering {
+		return ast.WalkContinue, nil
+	}
+
+	n := node.(*ast.Text)
+	segment := n.Segment
+	if n.IsRaw() {
+		r.Writer.RawWrite(w, segment.Value(source))
+	} else {
+		r.Writer.Write(w, segment.Value(source))
+		r.Writer.Write(w, []byte(" "))
+	}
+	return ast.WalkContinue, nil
+}
+
+func (r *VoidRenderer) renderString(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
+	if !entering {
+		return ast.WalkContinue, nil
+	}
+
+	n := node.(*ast.String)
+	if n.IsCode() {
+		_, _ = w.Write(n.Value)
+	} else {
+		if n.IsRaw() {
+			r.Writer.RawWrite(w, n.Value)
+		} else {
+			r.Writer.Write(w, n.Value)
+			r.Writer.Write(w, []byte("\n"))
+		}
+	}
+	return ast.WalkContinue, nil
+}