initial commit

1 files changed, 37 insertions, 0 deletions

diff --git a/src/validation.rs b/src/validation.rs
new file mode 100644
index 0000000..715b472
--- /dev/null
+++ b/src/validation.rs
@@ -0,0 +1,37 @@
+
+
+pub trait Validation {
+    fn validate(&self) -> Result<(), ValidationError>;
+}
+
+#[derive(Debug)]
+pub struct ValidationError {
+    messages: Vec<String>,
+}
+
+impl std::fmt::Display for ValidationError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        for msg in &self.messages {
+            write!(f, "{}\n", msg)?;
+        }
+        Ok(())
+    }
+}
+
+impl std::error::Error for ValidationError { }
+
+pub fn add_results(first: Result<(), ValidationError>, second: Result<(), ValidationError>) -> Result<(), ValidationError> {
+    if first.is_ok() && second.is_ok() {
+        Ok(())
+    } else if first.is_ok() && second.is_err() {
+        second
+    } else if first.is_err() && second.is_ok() {
+        first
+    } else {
+        let mut first = first.err().unwrap();
+        let mut second = second.err().unwrap();
+        first.messages.append(&mut second.messages);
+
+        Err( ValidationError{ messages:  first.messages } )
+    }
+}
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