Bugfix: Allow ID Strings

A user, Martin, reached out about a bug with IDs specifically with
quoting. Dotavious initially just used the string provided by caller
however this is problematic for a few different scenarios amongst others

1. Strings with spaces
2. Double-quoted strings
3. Strings with non-alphanumerical content

Details about IDs can be found at https://graphviz.org/doc/info/lang.html

This commit conditional formats IDs based on the following

1. Wrap string in quotes if containing non alpha-numerical characters
2. Escape quotes found in string

My rationale for conditionally formatting is mostly around keeping
previous behavior intact. Quote from the link above

An ID is just a string; the lack of quote characters in the first two forms is just for simplicity.
There is no semantic difference between abc_2 and "abc_2", or between 2.34 and "2.34"

Given these IDs are semantically the same I wanted to keep the same
formatting which is unquoted.

NOTE: This does not address HTML strings as IDs which needs to be
addressed at a later date.

1 files changed, 52 insertions, 0 deletions

diff --git a/tests/dot.rs b/tests/dot.rs
index bf960a9..9d944a2 100644
--- a/tests/dot.rs
+++ b/tests/dot.rs
@@ -63,6 +63,36 @@ digraph {
 }
 
 #[test]
+fn quotted_id() {
+    let quotted_id = r#"Earvin "Magic" Johnson"#;
+    let g = GraphBuilder::new_named_directed(quotted_id)
+        .build()
+        .unwrap();
+    let r = test_input(g);
+    assert_eq!(
+        r.unwrap(),
+        r#"digraph "Earvin \"Magic\" Johnson" {
+}
+"#
+    );
+}
+
+#[test]
+fn id_with_space() {
+    let id = "A Graph";
+    let g = GraphBuilder::new_named_directed(id)
+        .build()
+        .unwrap();
+    let r = test_input(g);
+    assert_eq!(
+        r.unwrap(),
+        r#"digraph "A Graph" {
+}
+"#
+    );
+}
+
+#[test]
 fn empty_digraph() {
     let g = GraphBuilder::new_named_directed("empty_graph")
         .build()
@@ -198,6 +228,28 @@ fn single_edge() {
 }
 
 #[test]
+fn format_edges() {
+    let g = GraphBuilder::new_named_directed("format_edges")
+        .add_node(Node::new(r#"Earvin "Magic" Johnson"#))
+        .add_node(Node::new("A Graph"))
+        .add_edge(Edge::new(r#"Earvin "Magic" Johnson"#, "A Graph"))
+        .build()
+        .unwrap();
+
+    let r = test_input(g);
+
+    assert_eq!(
+        r.unwrap(),
+        r#"digraph format_edges {
+    "Earvin \"Magic\" Johnson";
+    "A Graph";
+    "Earvin \"Magic\" Johnson" -> "A Graph";
+}
+"#
+    );
+}
+
+#[test]
 fn single_edge_with_style() {
     let edge = EdgeBuilder::new("N0", "N1")
         .style(EdgeStyle::Bold)