added basic method to check syntax command input

src/syntax/check.rs

@@ -4,10 +4,8 @@ use super::{
 };
 
 pub fn check(
-    syntax: Vec<PipelineElement>,
-    raw_source: &str,
-    file_id: FileId,
-) -> Result<Vec<PipelineElement>, Vec<SyntaxError>> {
+    syntax: &Vec<PipelineElement>,
+) -> Result<(), Vec<SyntaxError>> {
     let mut errs = Vec::new();
 
     if let Err(e_span) = check_missing_streamer(&syntax) {
@@ -23,7 +21,7 @@ pub fn check(
     }
 
     if errs.is_empty() {
-        Ok(syntax)
+        Ok(())
     } else {
         Err(errs)
     }

src/syntax/mod.rs

@@ -6,7 +6,7 @@ use logos::Span;
 use crate::lexer::Token;
 
 pub mod check;
-mod error;
+pub mod error;
 
 #[derive(Debug, Clone, PartialEq)]
 pub struct PipelineElement {