Adds try, maybe and join operators with !, ? and ; respectively

1 files changed, 36 insertions, 0 deletions

diff --git a/main/subexast.go b/main/subexast.go
index 7e2f33c..54cc5fe 100644
--- a/main/subexast.go
+++ b/main/subexast.go
@@ -115,3 +115,39 @@ func (ast SubexASTOutput) compileWith(next SubexState) SubexState {
 		next: next,
 	}
 }
+
+type SubexASTTry struct {
+	content SubexAST
+}
+func (ast SubexASTTry) compileWith(next SubexState) SubexState {
+	return SubexGroupState {
+		ast.content.compileWith(next),
+		next,
+	}
+}
+
+type SubexASTMaybe struct {
+	content SubexAST
+}
+func (ast SubexASTMaybe) compileWith(next SubexState) SubexState {
+	return SubexGroupState {
+		next,
+		ast.content.compileWith(next),
+	}
+}
+
+type SubexASTJoin struct {
+	content, delimiter SubexAST
+}
+func (ast SubexASTJoin) compileWith(next SubexState) SubexState {
+	afterContentState := &SubexGroupState {
+		nil,
+		next,
+	}
+	manyContentsState := ast.content.compileWith(afterContentState)
+	afterContentState.first = ast.delimiter.compileWith(manyContentsState)
+	return SubexGroupState {
+		manyContentsState,
+		next,
+	}
+}