Merge pull request #460 from cbednarski/b-ast-block-text

Add Text() retrieval for BaseBlock types

ast/ast_test.go

@@ -1,8 +1,11 @@
 package ast
 
 import (
+	"bytes"
 	"reflect"
 	"testing"
+
+	"github.com/yuin/goldmark/text"
 )
 
 func TestRemoveChildren(t *testing.T) {
@@ -73,3 +76,48 @@ func node(n Node, children ...Node) Node {
 	}
 	return n
 }
+
+func TestBaseBlock_Text(t *testing.T) {
+	source := []byte(`# Heading
+
+    code block here
+	and also here
+
+A paragraph
+
+` + "```" + `somelang
+fenced code block
+` + "```" + `
+
+The end`)
+
+	t.Run("fetch text from code block", func(t *testing.T) {
+		block := NewCodeBlock()
+		block.lines = text.NewSegments()
+		block.lines.Append(text.Segment{Start: 15, Stop: 31})
+		block.lines.Append(text.Segment{Start: 32, Stop: 46})
+
+		expected := []byte("code block here\nand also here\n")
+		if !bytes.Equal(expected, block.Text(source)) {
+			t.Errorf("Expected: %q, got: %q", string(expected), string(block.Text(source)))
+		}
+	})
+
+	t.Run("fetch text from fenced code block", func(t *testing.T) {
+		block := NewFencedCodeBlock(&Text{
+			Segment: text.Segment{Start: 63, Stop: 71},
+		})
+		block.lines = text.NewSegments()
+		block.lines.Append(text.Segment{Start: 72, Stop: 90})
+
+		expectedLang := []byte("somelang")
+		if !bytes.Equal(expectedLang, block.Language(source)) {
+			t.Errorf("Expected: %q, got: %q", string(expectedLang), string(block.Language(source)))
+		}
+
+		expected := []byte("fenced code block\n")
+		if !bytes.Equal(expected, block.Text(source)) {
+			t.Errorf("Expected: %q, got: %q", string(expected), string(block.Text(source)))
+		}
+	})
+}

ast/block.go

@@ -1,6 +1,7 @@
 package ast
 
 import (
+	"bytes"
 	"fmt"
 	"strings"
 
@@ -47,6 +48,14 @@ func (b *BaseBlock) SetLines(v *textm.Segments) {
 	b.lines = v
 }
 
+func (b *BaseBlock) Text(source []byte) []byte {
+	var buf bytes.Buffer
+	for _, line := range b.Lines().Sliced(0, b.Lines().Len()) {
+		buf.Write(line.Value(source))
+	}
+	return buf.Bytes()
+}
+
 // A Document struct is a root node of Markdown text.
 type Document struct {
 	BaseBlock