74 lines
1.4 KiB
Go
74 lines
1.4 KiB
Go
// Package verify offers convenience routenes for content verification.
|
|
package verify
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"path"
|
|
"runtime"
|
|
"strings"
|
|
)
|
|
|
|
// travel is the verification state
|
|
type travel struct {
|
|
diffs []differ
|
|
}
|
|
|
|
// differ is a verification failure.
|
|
type differ struct {
|
|
// path is the expression to the content.
|
|
path string
|
|
// msg has a reason.
|
|
msg string
|
|
}
|
|
|
|
// segment is a differ.path component used for lazy formatting.
|
|
type segment struct {
|
|
format string
|
|
x interface{}
|
|
}
|
|
|
|
func (t *travel) differ(path []*segment, msg string, args ...interface{}) {
|
|
var buf bytes.Buffer
|
|
for _, s := range path {
|
|
buf.WriteString(fmt.Sprintf(s.format, s.x))
|
|
}
|
|
|
|
t.diffs = append(t.diffs, differ{
|
|
msg: fmt.Sprintf(msg, args...),
|
|
path: buf.String(),
|
|
})
|
|
}
|
|
|
|
func (t *travel) report(name string) string {
|
|
if len(t.diffs) == 0 {
|
|
return ""
|
|
}
|
|
|
|
var buf bytes.Buffer
|
|
|
|
buf.WriteString("verification for ")
|
|
buf.WriteString(name)
|
|
if _, file, lineno, ok := runtime.Caller(2); ok {
|
|
fmt.Fprintf(&buf, " at %s:%d", path.Base(file), lineno)
|
|
}
|
|
buf.WriteByte(':')
|
|
|
|
for _, d := range t.diffs {
|
|
buf.WriteByte('\n')
|
|
if d.path != "" {
|
|
buf.WriteString(d.path)
|
|
buf.WriteString(": ")
|
|
}
|
|
lines := strings.Split(d.msg, "\n")
|
|
buf.WriteString(lines[0])
|
|
for _, l := range lines[1:] {
|
|
buf.WriteByte('\n')
|
|
buf.WriteString(strings.Repeat(" ", len(d.path)+2))
|
|
buf.WriteString(l)
|
|
}
|
|
}
|
|
|
|
return buf.String()
|
|
}
|