Escape Nodelet/tag names for Dot as well.

internal/graph/dotgraph.go

@@ -127,7 +127,7 @@ func (b *builder) addLegend() {
 	}
 	title := labels[0]
 	fmt.Fprintf(b, `subgraph cluster_L { "%s" [shape=box fontsize=16`, title)
-	fmt.Fprintf(b, ` label="%s\l"`, strings.Join(escapeAllForDot(labels), `\l`))
+	fmt.Fprintf(b, ` label="%s\l"`, strings.Join(escapeAllForDot(labels, leftJustify), `\l`))
 	if b.config.LegendURL != "" {
 		fmt.Fprintf(b, ` URL="%s" target="_blank"`, b.config.LegendURL)
 	}
@@ -187,7 +187,7 @@ func (b *builder) addNode(node *Node, nodeID int, maxFlat float64) {
 
 	// Create DOT attribute for node.
 	attr := fmt.Sprintf(`label="%s" id="node%d" fontsize=%d shape=%s tooltip="%s (%s)" color="%s" fillcolor="%s"`,
-		label, nodeID, fontSize, shape, escapeForDot(node.Info.PrintableName()), cumValue,
+		label, nodeID, fontSize, shape, escapeForDot(node.Info.PrintableName(), centerJustify), cumValue,
 		dotColor(float64(node.CumValue())/float64(abs64(b.config.Total)), false),
 		dotColor(float64(node.CumValue())/float64(abs64(b.config.Total)), true))
 
@@ -247,7 +247,7 @@ func (b *builder) addNodelets(node *Node, nodeID int) bool {
 			continue
 		}
 		weight := b.config.FormatValue(w)
-		nodelets += fmt.Sprintf(`N%d_%d [label = "%s" id="N%d_%d" fontsize=8 shape=box3d tooltip="%s"]`+"\n", nodeID, i, t.Name, nodeID, i, weight)
+		nodelets += fmt.Sprintf(`N%d_%d [label = "%s" id="N%d_%d" fontsize=8 shape=box3d tooltip="%s"]`+"\n", nodeID, i, escapeForDot(t.Name, centerJustify), nodeID, i, weight)
 		nodelets += fmt.Sprintf(`N%d -> N%d_%d [label=" %s" weight=100 tooltip="%s" labeltooltip="%s"]`+"\n", nodeID, nodeID, i, weight, weight, weight)
 		if nts := lnts[t.Name]; nts != nil {
 			nodelets += b.numericNodelets(nts, maxNodelets, flatTags, fmt.Sprintf(`N%d_%d`, nodeID, i))
@@ -274,7 +274,7 @@ func (b *builder) numericNodelets(nts []*Tag, maxNumNodelets int, flatTags bool,
 		}
 		if w != 0 {
 			weight := b.config.FormatValue(w)
-			nodelets += fmt.Sprintf(`N%s_%d [label = "%s" id="N%s_%d" fontsize=8 shape=box3d tooltip="%s"]`+"\n", source, j, t.Name, source, j, weight)
+			nodelets += fmt.Sprintf(`N%s_%d [label = "%s" id="N%s_%d" fontsize=8 shape=box3d tooltip="%s"]`+"\n", source, j, escapeForDot(t.Name, centerJustify), source, j, weight)
 			nodelets += fmt.Sprintf(`%s -> N%s_%d [label=" %s" weight=100 tooltip="%s" labeltooltip="%s"%s]`+"\n", source, source, j, weight, weight, weight, attr)
 		}
 	}
@@ -305,8 +305,8 @@ func (b *builder) addEdge(edge *Edge, from, to int, hasNodelets bool) {
 		arrow = "..."
 	}
 	tooltip := fmt.Sprintf(`"%s %s %s (%s)"`,
-		escapeForDot(edge.Src.Info.PrintableName()), arrow,
-		escapeForDot(edge.Dest.Info.PrintableName()), w)
+		escapeForDot(edge.Src.Info.PrintableName(), centerJustify), arrow,
+		escapeForDot(edge.Dest.Info.PrintableName(), centerJustify), w)
 	attr = fmt.Sprintf(`%s tooltip=%s labeltooltip=%s`, attr, tooltip, tooltip)
 
 	if edge.Residual {
@@ -383,7 +383,7 @@ func dotColor(score float64, isBackground bool) string {
 
 func multilinePrintableName(info *NodeInfo) string {
 	infoCopy := *info
-	infoCopy.Name = escapeForDot(ShortenFunctionName(infoCopy.Name))
+	infoCopy.Name = escapeForDot(ShortenFunctionName(infoCopy.Name), centerJustify)
 	infoCopy.Name = strings.Replace(infoCopy.Name, "::", `\n`, -1)
 	infoCopy.Name = strings.Replace(infoCopy.Name, ".", `\n`, -1)
 	if infoCopy.File != "" {
@@ -474,18 +474,35 @@ func min64(a, b int64) int64 {
 	return b
 }
 
+type dotJustifyType int64
+
+const (
+	leftJustify   dotJustifyType = 0
+	centerJustify dotJustifyType = 1
+	rightJustify  dotJustifyType = 2
+)
+
 // Applies escapeForDot to all strings in the given slice.
-func escapeAllForDot(in []string) []string {
+func escapeAllForDot(in []string, justify dotJustifyType) []string {
 	var out = make([]string, len(in))
 	for i := range in {
-		out[i] = escapeForDot(in[i])
+		out[i] = escapeForDot(in[i], justify)
 	}
 	return out
 }
 
 // escapeForDot escapes double quotes and backslashes, and replaces Graphviz's
 // "center" character (\n) with a left-justified character.
 // See https://graphviz.org/doc/info/attrs.html#k:escString for more info.
-func escapeForDot(str string) string {
-	return strings.ReplaceAll(strings.ReplaceAll(strings.ReplaceAll(str, `\`, `\\`), `"`, `\"`), "\n", `\l`)
+func escapeForDot(str string, justify dotJustifyType) string {
+	var newline string
+	switch justify {
+	case leftJustify:
+		newline = `\l`
+	case centerJustify:
+		newline = `\n`
+	case rightJustify:
+		newline = `\r`
+	}
+	return strings.ReplaceAll(strings.ReplaceAll(strings.ReplaceAll(str, `\`, `\\`), `"`, `\"`), "\n", newline)
 }

internal/graph/dotgraph_test.go

@@ -142,9 +142,17 @@ func TestComposeWithNamesThatNeedEscaping(t *testing.T) {
 	g := baseGraph()
 	a, c := baseAttrsAndConfig()
 
+	// Change node names to have `"` in them, which need to be escaped for dot.
 	g.Nodes[0].Info = NodeInfo{Name: "var\"src\""}
 	g.Nodes[1].Info = NodeInfo{Name: "var\"#dest#\""}
 
+	// Add tag to Node 1 with `"` in name.
+	g.Nodes[0].LabelTags["a"] = &Tag{
+		Name: "var\"tag1\"",
+		Cum:  10,
+		Flat: 10,
+	}
+
 	// Set edge to be Residual.
 	g.Nodes[0].Out[g.Nodes[1]].Residual = true
 
@@ -375,11 +383,30 @@ func TestEscapeForDot(t *testing.T) {
 		},
 	} {
 		t.Run(tc.desc, func(t *testing.T) {
-			if got := escapeAllForDot(tc.input); !reflect.DeepEqual(got, tc.want) {
+			if got := escapeAllForDot(tc.input, leftJustify); !reflect.DeepEqual(got, tc.want) {
 				t.Errorf("escapeAllForDot(%s) = %s, want %s", tc.input, got, tc.want)
 			}
 		})
 	}
+
+	// Test the different options for justifying text newlines in Dot
+	for _, justify := range []dotJustifyType{leftJustify, centerJustify, rightJustify} {
+		t.Run("Dot newline justification", func(t *testing.T) {
+			input := []string{"Line 1\nLine 2"}
+			var want []string
+			switch justify {
+			case leftJustify:
+				want = []string{`Line 1\lLine 2`}
+			case centerJustify:
+				want = []string{`Line 1\nLine 2`}
+			case rightJustify:
+				want = []string{`Line 1\rLine 2`}
+			}
+			if got := escapeAllForDot(input, justify); !reflect.DeepEqual(got, want) {
+				t.Errorf("escapeAllForDot(%s) = %s, want %s", input, got, want)
+			}
+		})
+	}
 }
 
 func tagString(t []*Tag) string {

internal/graph/graph.go

@@ -522,7 +522,7 @@ func joinLabels(s *profile.Sample) string {
 		}
 	}
 	sort.Strings(labels)
-	return strings.Join(labels, `\n`)
+	return strings.Join(labels, "\n") // This will be escaped downstream if needed.
 }
 
 // isNegative returns true if the node is considered as "negative" for the

internal/graph/testdata/compose7.dot

@@ -2,6 +2,8 @@ digraph "testtitle" {
 node [style=filled fillcolor="#f8f8f8"]
 subgraph cluster_L { "label1" [shape=box fontsize=16 label="label1\llabel2\llabel3: \"foo\"\l" tooltip="testtitle"] }
 N1 [label="var\"src\"\n10 (10.00%)\nof 25 (25.00%)" id="node1" fontsize=22 shape=box tooltip="var\"src\" (25)" color="#b23c00" fillcolor="#edddd5"]
+N1_0 [label = "var\"tag1\"" id="N1_0" fontsize=8 shape=box3d tooltip="10"]
+N1 -> N1_0 [label=" 10" weight=100 tooltip="10" labeltooltip="10"]
 N2 [label="var\"#dest#\"\n15 (15.00%)\nof 25 (25.00%)" id="node2" fontsize=24 shape=box tooltip="var\"#dest#\" (25)" color="#b23c00" fillcolor="#edddd5"]
-N1 -> N2 [label=" 10" weight=11 color="#b28559" tooltip="var\"src\" ... var\"#dest#\" (10)" labeltooltip="var\"src\" ... var\"#dest#\" (10)" style="dotted"]
+N1 -> N2 [label=" 10" weight=11 color="#b28559" tooltip="var\"src\" ... var\"#dest#\" (10)" labeltooltip="var\"src\" ... var\"#dest#\" (10)" style="dotted" minlen=2]
 }