lang: rewrite parser

crates/lang/src/parser/grammar/expression/instruction.rs

@@ -0,0 +1,30 @@
+use crate::parser::{syntax_kind::SyntaxKind::*, Parser};
+
+use super::lit::literal;
+
+pub fn instr(p: &mut Parser) {
+    let instr = p.start();
+
+    instr_name(p);
+    instr_params(p);
+
+    instr.complete(p, INSTR);
+}
+
+fn instr_name(p: &mut Parser) {
+    let instr_name = p.start();
+
+    while p.at(IDENT) {
+        p.do_bump();
+    }
+
+    instr_name.complete(p, INSTR_NAME);
+}
+
+fn instr_params(p: &mut Parser) {
+    if let Some(start) = literal(p) {
+        while literal(p).is_some() {}
+
+        start.precede(p).complete(p, INSTR_PARAMS);
+    }
+}