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// Package src provides types for working with source files.
package src
import (
"os"
"path/filepath"
"runtime"
"strconv"
)
// Position represents a position in a source file.
type Position struct {
Filename string
Line int // 1-up
}
// FramePosition returns the Position of the given stack frame.
func FramePosition(f runtime.Frame) Position {
return Position{
Filename: f.File,
Line: f.Line,
}
}
// IsValid reports whether the position is valid: Line must be positive, but
// Filename may be empty.
func (p Position) IsValid() bool {
return p.Line > 0
}
// String represents Position as a string.
func (p Position) String() string {
if !p.IsValid() {
return "-"
}
var s string
if p.Filename != "" {
s += p.Filename + ":"
}
s += strconv.Itoa(p.Line)
return s
}
// Rel returns Position relative to basepath. If the given filename cannot be
// expressed relative to basepath the position will be returned unchanged.
func (p Position) Rel(basepath string) Position {
q := p
if rel, err := filepath.Rel(basepath, q.Filename); err == nil {
q.Filename = rel
}
return q
}
// Relwd returns Position relative to the current working directory. Returns p
// unchanged if the working directory cannot be determined, or the filename
// cannot be expressed relative to the working directory.
func (p Position) Relwd() Position {
if wd, err := os.Getwd(); err == nil {
return p.Rel(wd)
}
return p
}
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