Add some additional impls

src/lib.rs

@@ -1,4 +1,4 @@
-use core::fmt::{Display, Write};
+use core::fmt::Write;
 
 pub mod internal;
 
@@ -7,7 +7,7 @@ use internal::{
 	parse::{parse, Ast},
 };
 
-pub trait Value: core::fmt::Debug {
+pub trait Value {
 	fn print(&self, out: &mut String);
 	fn lookup(&self, name: &str) -> Option<&dyn Value>;
 	fn has(&self) -> Option<&dyn Value>;
@@ -15,6 +15,48 @@ pub trait Value: core::fmt::Debug {
 	fn for_(&self, index: usize) -> Option<&dyn Value>;
 }
 
+macro_rules! value_for_int {
+	($tp:ty) => {
+		impl Value for $tp {
+			fn print(&self, out: &mut String) {
+				let _ = write!(out, "{self}");
+			}
+
+			fn lookup(&self, _: &str) -> Option<&dyn Value> {
+				None
+			}
+
+			fn has(&self) -> Option<&dyn Value> {
+				if self.if_() {
+					Some(self)
+				} else {
+					None
+				}
+			}
+
+			fn if_(&self) -> bool {
+				*self != 0
+			}
+
+			fn for_(&self, _: usize) -> Option<&dyn Value> {
+				None
+			}
+		}
+	};
+}
+value_for_int!(u8);
+value_for_int!(u16);
+value_for_int!(u32);
+value_for_int!(u64);
+value_for_int!(u128);
+value_for_int!(usize);
+value_for_int!(i8);
+value_for_int!(i16);
+value_for_int!(i32);
+value_for_int!(i64);
+value_for_int!(i128);
+value_for_int!(isize);
+
 impl<'a, T> Value for &'a T
 where
 	T: Value,
@@ -70,6 +112,36 @@ impl Value for &str {
 	}
 }
 
+impl Value for String {
+	fn print(&self, out: &mut String) {
+		out.push_str(self);
+	}
+
+	fn lookup(&self, _: &str) -> Option<&dyn Value> {
+		None
+	}
+
+	fn has(&self) -> Option<&dyn Value> {
+		if self.if_() {
+			None
+		} else {
+			Some(self)
+		}
+	}
+
+	fn if_(&self) -> bool {
+		!self.is_empty()
+	}
+
+	fn for_(&self, index: usize) -> Option<&dyn Value> {
+		if index == 0 {
+			Some(self)
+		} else {
+			None
+		}
+	}
+}
+
 impl Value for (&str, &dyn Value) {
 	fn print(&self, out: &mut String) {
 		out.push('(');
@@ -300,10 +372,10 @@ mod test {
 			"{for .items}{for .names}{.}, {/for}{/for}",
 			values_list_map! {
 				"items": values![values_list_map! {
-					"names": values!["Bob", "Larry"],
+					"names": values!["Bob", "Larry", 0],
 				}]
 			},
-			"Bob, Larry, ",
+			"Bob, Larry, 0, ",
 		)
 	}