Support ignore target

3 files changed, 13 insertions, 2 deletions

diff --git a/src/main/java/org/shedlang/compiler/parser/Parser.java b/src/main/java/org/shedlang/compiler/parser/Parser.java
index 44c132e7..eef01d28 100644
--- a/src/main/java/org/shedlang/compiler/parser/Parser.java
+++ b/src/main/java/org/shedlang/compiler/parser/Parser.java
@@ -301,7 +301,7 @@ public class Parser {
 
     static UntypedFunctionStatementNode parseFunctionStatement(TokenIterator<TokenType> tokens) {
         return switch (tokens.peek().tokenType()) {
-            case KEYWORD_ASSIGN, KEYWORD_VAL, KEYWORD_VAR ->
+            case KEYWORD_ASSIGN, KEYWORD_VAL, KEYWORD_VAR, SYMBOL_UNDERSCORE ->
                 parseAssign(tokens);
 
             case KEYWORD_RETURN ->
@@ -633,6 +633,15 @@ public class Parser {
                 yield new UntypedTargetNode.Tuple(elements, source);
             }
 
+            case SYMBOL_UNDERSCORE -> {
+                tokens.skip(TokenType.SYMBOL_UNDERSCORE);
+
+                var end = tokens.position();
+                var source = start.to(end);
+
+                yield new UntypedTargetNode.Ignore(source);
+            }
+
             default ->
                 throw new UnexpectedTokenException("target", tokens.peek());
         };
diff --git a/src/main/java/org/shedlang/compiler/parser/TokenType.java b/src/main/java/org/shedlang/compiler/parser/TokenType.java
index d9cd95aa..53a7877a 100644
--- a/src/main/java/org/shedlang/compiler/parser/TokenType.java
+++ b/src/main/java/org/shedlang/compiler/parser/TokenType.java
@@ -37,4 +37,5 @@ public enum TokenType {
     SYMBOL_PLUS,
     SYMBOL_SEMICOLON,
     SYMBOL_THIN_ARROW,
+    SYMBOL_UNDERSCORE,
 }
diff --git a/src/main/java/org/shedlang/compiler/parser/Tokeniser.java b/src/main/java/org/shedlang/compiler/parser/Tokeniser.java
index 3793417a..bfa75a8e 100644
--- a/src/main/java/org/shedlang/compiler/parser/Tokeniser.java
+++ b/src/main/java/org/shedlang/compiler/parser/Tokeniser.java
@@ -51,7 +51,8 @@ public class Tokeniser {
             RegexTokeniser.rule(TokenType.SYMBOL_PAREN_OPEN, "\\("),
             RegexTokeniser.rule(TokenType.SYMBOL_PAREN_CLOSE, "\\)"),
             RegexTokeniser.rule(TokenType.SYMBOL_PLUS, "\\+"),
-            RegexTokeniser.rule(TokenType.SYMBOL_SEMICOLON, ";")
+            RegexTokeniser.rule(TokenType.SYMBOL_SEMICOLON, ";"),
+            RegexTokeniser.rule(TokenType.SYMBOL_UNDERSCORE, "_")
         )
     );