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54 lines
1.3 KiB
Go
54 lines
1.3 KiB
Go
// Copyright 2017, The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE.md file.
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package cmp
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import (
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"fmt"
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"reflect"
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"strings"
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"github.com/google/go-cmp/cmp/internal/value"
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)
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type defaultReporter struct {
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Option
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diffs []string // List of differences, possibly truncated
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ndiffs int // Total number of differences
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nbytes int // Number of bytes in diffs
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nlines int // Number of lines in diffs
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}
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var _ reporter = (*defaultReporter)(nil)
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func (r *defaultReporter) Report(x, y reflect.Value, eq bool, p Path) {
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if eq {
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return // Ignore equal results
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}
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const maxBytes = 4096
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const maxLines = 256
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r.ndiffs++
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if r.nbytes < maxBytes && r.nlines < maxLines {
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sx := value.Format(x, true)
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sy := value.Format(y, true)
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if sx == sy {
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// Stringer is not helpful, so rely on more exact formatting.
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sx = value.Format(x, false)
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sy = value.Format(y, false)
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}
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s := fmt.Sprintf("%#v:\n\t-: %s\n\t+: %s\n", p, sx, sy)
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r.diffs = append(r.diffs, s)
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r.nbytes += len(s)
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r.nlines += strings.Count(s, "\n")
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}
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}
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func (r *defaultReporter) String() string {
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s := strings.Join(r.diffs, "")
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if r.ndiffs == len(r.diffs) {
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return s
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}
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return fmt.Sprintf("%s... %d more differences ...", s, len(r.diffs)-r.ndiffs)
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}
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