snapshot of https://github.com/ory/keto.git (master, 2026-09-16; blobs > 131072B omitted)

schema/parse_errors.go

@@ -0,0 +1,129 @@
+// Copyright © 2023 Ory Corp
+// SPDX-License-Identifier: Apache-2.0
+
+package schema
+
+import (
+	"fmt"
+	"math"
+	"strings"
+	"unicode"
+
+	opl "github.com/ory/keto/gen/go/ory/keto/opl/v1alpha1"
+	"github.com/ory/keto/ketoapi"
+)
+
+type (
+	ParseError struct {
+		msg  string
+		item item
+		p    *parser
+	}
+)
+
+func max(a, b int) int {
+	if a > b {
+		return a
+	}
+	return b
+}
+
+func (e *ParseError) Error() string {
+	var s strings.Builder
+	start := e.toSrcPos(e.item.Start)
+	end := e.toSrcPos(e.item.End)
+	rows := e.rows()
+	startLineIdx := max(start.Line-2, 0)
+	errorLineIdx := max(start.Line-1, 0)
+
+	_, _ = fmt.Fprintf(&s, "error from %d:%d to %d:%d: %s\n\n",
+		start.Line, start.Col,
+		end.Line, end.Col,
+		e.msg)
+
+	if len(rows) < start.Line {
+		s.WriteString("meta error: could not find source position in input\n")
+		return s.String()
+	}
+
+	for line := startLineIdx; line <= errorLineIdx; line++ {
+		_, _ = fmt.Fprintf(&s, "%4d | %s\n", line, rows[line])
+	}
+	s.WriteString("     | ")
+	for i, r := range rows[errorLineIdx] {
+		switch {
+		case start.Col == i:
+			s.WriteRune('^')
+		case start.Col <= i && i <= end.Col-1:
+			s.WriteRune('~')
+		case unicode.IsSpace(r):
+			s.WriteRune(r)
+		default:
+			s.WriteRune(' ')
+		}
+	}
+	s.WriteRune('\n')
+
+	if errorLineIdx+1 < len(rows) {
+		_, _ = fmt.Fprintf(&s, "%4d | %s\n", errorLineIdx+1, rows[errorLineIdx+1])
+		s.WriteRune('\n')
+	}
+
+	return s.String()
+}
+
+func (e *ParseError) ToAPI() *ketoapi.ParseError {
+	return &ketoapi.ParseError{
+		Message: e.msg,
+		Start:   e.toSrcPos(e.item.Start),
+		End:     e.toSrcPos(e.item.End),
+	}
+}
+func (e *ParseError) ToProto() *opl.ParseError {
+	start := e.toSrcPos(e.item.Start)
+	end := e.toSrcPos(e.item.End)
+	return &opl.ParseError{
+		Message: e.msg,
+		Start: &opl.SourcePosition{
+			Line:   clampUint32(start.Line),
+			Column: clampUint32(start.Col),
+		},
+		End: &opl.SourcePosition{
+			Line:   clampUint32(end.Line),
+			Column: clampUint32(end.Col),
+		},
+	}
+}
+
+// toSrcPos converts the given position in the input to a Line and column
+// number.
+func (e *ParseError) toSrcPos(pos int) (srcPos ketoapi.SourcePosition) {
+	srcPos.Line = 1
+	for _, c := range e.p.lexer.input {
+		srcPos.Col++
+		pos--
+		if pos <= 0 {
+			break
+		}
+		if c == '\n' {
+			srcPos.Line++
+			srcPos.Col = 0
+		}
+	}
+	return
+}
+
+func clampUint32(v int) uint32 {
+	switch {
+	case v < 0:
+		return 0
+	case uint64(v) > math.MaxUint32:
+		return math.MaxUint32
+	default:
+		return uint32(v)
+	}
+}
+
+func (e *ParseError) rows() []string {
+	return strings.Split(e.p.lexer.input, "\n")
+}