Produce (slightly) better parser errors

1 files changed, 60 insertions, 0 deletions

diff --git a/pkg/lang/parser/errors.go b/pkg/lang/parser/errors.go
new file mode 100644
index 0000000..a020e01
--- /dev/null
+++ b/pkg/lang/parser/errors.go
@@ -0,0 +1,60 @@
+package parser
+
+import (
+	"fmt"
+	"jinx/pkg/lang/scanner/token"
+	"jinx/pkg/libs/source"
+)
+
+type ErrFunctionNoThisAllowed struct {
+	At source.Loc
+}
+
+func (e ErrFunctionNoThisAllowed) Error() string {
+	return fmt.Sprintf("non-method function cannot have 'this' as parameter at %v", e.At)
+}
+
+type ErrFunctionLiteralNoThisAllowed struct {
+	At source.Loc
+}
+
+func (e ErrFunctionLiteralNoThisAllowed) Error() string {
+	return fmt.Sprintf("function literal cannot have 'this' as parameter at %v", e.At)
+}
+
+type ErrExpectedToken struct {
+	At     source.Loc
+	Wanted token.TokenKind
+	Got    token.Token
+}
+
+func (e ErrExpectedToken) Error() string {
+	return fmt.Sprintf("unexpected token %v, wanted %v at %v", e.Got, e.Wanted, e.At)
+}
+
+type ErrExpectedStatementEnd struct {
+	At  source.Loc
+	Got token.Token
+}
+
+func (e ErrExpectedStatementEnd) Error() string {
+	return fmt.Sprintf("expected statement end, got %v at %v", e.Got, e.At)
+}
+
+type ErrExpectedUnitExpressionStart struct {
+	At  source.Loc
+	Got token.Token
+}
+
+func (e ErrExpectedUnitExpressionStart) Error() string {
+	return fmt.Sprintf("unexpected token %v, wanted unit expression start at %v", e.Got, e.At)
+}
+
+type ErrExpectedValueLiteral struct {
+	At  source.Loc
+	Got token.Token
+}
+
+func (e ErrExpectedValueLiteral) Error() string {
+	return fmt.Sprintf("unexpected token %v, wanted value literal %v", e.Got, e.At)
+}