add parse error

yaacov · Dec 4, 2018 · 55633c7 · 55633c7
1 parent 247ba3d
commit 55633c7
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Showing 2 changed files with 12 additions and 4 deletions.
diff --git a/pkg/tsl/error_listener.go b/pkg/tsl/error_listener.go
@@ -16,9 +16,6 @@
 package tsl
 
 import (
-	"fmt"
-	"strconv"
-
 	"github.com/antlr/antlr4/runtime/Go/antlr"
 )
 
@@ -41,5 +38,5 @@ func (d *ErrorListener) SyntaxError(
 	msg string,
 	e antlr.RecognitionException) {
 
-	d.Err = fmt.Errorf("line " + strconv.Itoa(line) + ":" + strconv.Itoa(column) + " " + msg)
+	d.Err = ParseError{line: line, column: column, msg: msg}
 }
diff --git a/pkg/tsl/errors.go b/pkg/tsl/errors.go
@@ -44,3 +44,14 @@ type StackError struct{}
 func (e StackError) Error() string {
 	return fmt.Sprintf("unexpected operator stack")
 }
+
+// ParseError is raised on parser error.
+type ParseError struct {
+	line   int
+	column int
+	msg    string
+}
+
+func (e ParseError) Error() string {
+	return fmt.Sprintf("parse error [%d:%d]: %s", e.line, e.column, e.msg)
+}