1 files changed, 61 insertions, 0 deletions
diff --git a/validator_derive/src/lit.rs b/validator_derive/src/lit.rs
new file mode 100644
index 0000000..0753a17
--- /dev/null
+++ b/validator_derive/src/lit.rs
@@ -0,0 +1,61 @@
+use quote::{self, ToTokens};
+use syn;
+
+
+pub fn lit_to_string(lit: &syn::Lit) -> Option<String> {
+    match *lit {
+        syn::Lit::Str(ref s, _) => Some(s.to_string()),
+        _ => None,
+    }
+}
+
+pub fn lit_to_int(lit: &syn::Lit) -> Option<u64> {
+    match *lit {
+        syn::Lit::Int(ref s, _) => Some(*s),
+        // TODO: remove when attr_literals is stable
+        syn::Lit::Str(ref s, _) => Some(s.parse::<u64>().unwrap()),
+        _ => None,
+    }
+}
+
+pub fn lit_to_float(lit: &syn::Lit) -> Option<f64> {
+    match *lit {
+        syn::Lit::Float(ref s, _) => Some(s.parse::<f64>().unwrap()),
+        syn::Lit::Int(ref s, _) => Some(*s as f64),
+        // TODO: remove when attr_literals is stable
+        syn::Lit::Str(ref s, _) => Some(s.parse::<f64>().unwrap()),
+        _ => None,
+    }
+}
+
+pub fn lit_to_bool(lit: &syn::Lit) -> Option<bool> {
+    match *lit {
+        syn::Lit::Bool(ref s) => Some(*s),
+        // TODO: remove when attr_literals is stable
+        syn::Lit::Str(ref s, _) => if s == "true" { Some(true) } else { Some(false) },
+        _ => None,
+    }
+}
+
+pub fn option_u64_to_tokens(opt: Option<u64>) -> quote::Tokens {
+    let mut tokens = quote::Tokens::new();
+    tokens.append("::");
+    tokens.append("std");
+    tokens.append("::");
+    tokens.append("option");
+    tokens.append("::");
+    tokens.append("Option");
+    tokens.append("::");
+    match opt {
+        Some(ref t) => {
+            tokens.append("Some");
+            tokens.append("(");
+            t.to_tokens(&mut tokens);
+            tokens.append(")");
+        }
+        None => {
+            tokens.append("None");
+        }
+    }
+    tokens
+}