basic case statement

1 files changed, 18 insertions, 0 deletions

diff --git a/src/run/mod.rs b/src/run/mod.rs
index a2a6cb1..f86278d 100644
--- a/src/run/mod.rs
+++ b/src/run/mod.rs
@@ -26,6 +26,7 @@ pub enum ExecError {
     Parse(crate::parse::ParseError),
     Break,
     Continue,
+    NoCaseMatch,
 }
 
 impl ExecError {
@@ -71,6 +72,7 @@ impl ExecError {
             ExecError::Parse(pe) => format!("parse error: {pe:?}"),
             ExecError::Break => "break: only useful in loops".to_string(),
             ExecError::Continue => "continue: only useful in loops".to_string(),
+            ExecError::NoCaseMatch => "case: no pattern matched".to_string(),
         }
     }
 }
@@ -356,6 +358,7 @@ impl Executor {
             Ast::Pipes(pipes) => self.execute_pipeline(pipes, stdin, stdout),
             Ast::If(cond) => self.execute_if(cond, stdin, stdout),
             Ast::While(w) => self.execute_while(w, stdin, stdout),
+            Ast::Case(c) => self.execute_case(c, stdin, stdout),
         }
     }
 
@@ -446,6 +449,21 @@ impl Executor {
         SpawnedCmd::Fun(handle)
     }
 
+    fn execute_case(
+        &mut self,
+        c: parse::Case<PostExpansion>,
+        stdin: InputReader,
+        stdout: OutputWriter,
+    ) -> SpawnedCmd {
+        for branch in c.branches.into_iter() {
+            // TODO: regex case patterns
+            if branch.pattern == c.discriminant {
+                return self.execute_block(branch.block, stdin, stdout);
+            }
+        }
+        SpawnedCmd::Joined(Err(ExecError::NoCaseMatch))
+    }
+
     pub fn execute_script(
         &mut self,
         s: parse::Script,