rust: add step2_eval.

1 files changed, 26 insertions, 0 deletions

diff --git a/rust/src/printer.rs b/rust/src/printer.rs
new file mode 100644
index 0000000..59821ec
--- /dev/null
+++ b/rust/src/printer.rs
@@ -0,0 +1,26 @@
+pub fn escape_str(s: &str) -> String {
+    let mut escaped = String::new();
+    escaped.push('"');
+    for c in s.as_slice().chars() {
+        let _ = match c {
+          '"' => escaped.push_str("\\\""),
+          '\\' => escaped.push_str("\\\\"),
+          '\x08' => escaped.push_str("\\b"),
+          '\x0c' => escaped.push_str("\\f"),
+          '\n' => escaped.push_str("\\n"),
+          '\r' => escaped.push_str("\\r"),
+          '\t' => escaped.push_str("\\t"),
+          _ => escaped.push(c),
+        };
+    };
+
+    escaped.push('"');
+
+    escaped
+}
+
+pub fn unescape_str(s: &str) -> String {
+    let re1 = regex!(r#"\\""#);
+    let re2 = regex!(r#"\n"#);
+    re2.replace_all(re1.replace_all(s.as_slice(), "\"").as_slice(), "\n")
+}