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package token
import "fmt"
// Pos describes an arbitrary source position
// including the file, line, and column location.
// A Position is valid if the line number is > 0.
type Pos struct {
Filename string // filename, if any
Offset int // offset, starting at 0
Line int // line number, starting at 1
Column int // column number, starting at 1 (character count)
}
// IsValid returns true if the position is valid.
func (p *Pos) IsValid() bool { return p.Line > 0 }
// String returns a string in one of several forms:
//
// file:line:column valid position with file name
// line:column valid position without file name
// file invalid position with file name
// - invalid position without file name
func (p Pos) String() string {
s := p.Filename
if p.IsValid() {
if s != "" {
s += ":"
}
s += fmt.Sprintf("%d:%d", p.Line, p.Column)
}
if s == "" {
s = "-"
}
return s
}
// Before reports whether the position p is before u.
func (p Pos) Before(u Pos) bool {
return u.Offset > p.Offset || u.Line > p.Line
}
// After reports whether the position p is after u.
func (p Pos) After(u Pos) bool {
return u.Offset < p.Offset || u.Line < p.Line
}
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