Document the location.go file
This commit is contained in:
parent
2f6f79fe35
commit
e26bc00f09
|
@ -18,10 +18,21 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||||
|
|
||||||
package ast
|
package ast
|
||||||
|
|
||||||
|
// ILocatable describes something that can be located in a source
|
||||||
|
type ILocatable interface {
|
||||||
|
GetLocation() *Location
|
||||||
|
}
|
||||||
|
|
||||||
|
// Location is used to point to a specific location in the source
|
||||||
|
// code (before parse). It can point to a single point or a range.
|
||||||
type Location struct {
|
type Location struct {
|
||||||
start int
|
start int
|
||||||
end int
|
end int
|
||||||
source Source
|
// Where this location is pointing too ?
|
||||||
|
source Source
|
||||||
|
|
||||||
|
// Is it a known location or not ? For example builtins doesn't
|
||||||
|
// have a knowen location
|
||||||
knownLocation bool
|
knownLocation bool
|
||||||
}
|
}
|
||||||
|
|
||||||
|
@ -35,6 +46,9 @@ func (l *Location) GetEnd() int {
|
||||||
return l.end
|
return l.end
|
||||||
}
|
}
|
||||||
|
|
||||||
|
// GetSource returns the source of the current location or the "builtin"
|
||||||
|
// source to indicate that the source of this location is not known in
|
||||||
|
// the context of source code
|
||||||
func (l *Location) GetSource() *Source {
|
func (l *Location) GetSource() *Source {
|
||||||
if l.IsKnownLocaiton() {
|
if l.IsKnownLocaiton() {
|
||||||
return &l.source
|
return &l.source
|
||||||
|
@ -42,6 +56,8 @@ func (l *Location) GetSource() *Source {
|
||||||
return GetBuiltinSource()
|
return GetBuiltinSource()
|
||||||
}
|
}
|
||||||
|
|
||||||
|
// IncStart increases the start pointer of the location by `x` with respect
|
||||||
|
// to the boundaries of the source
|
||||||
func (l *Location) IncStart(x int) {
|
func (l *Location) IncStart(x int) {
|
||||||
if x+l.start < len(*l.source.Buffer) {
|
if x+l.start < len(*l.source.Buffer) {
|
||||||
l.start += x
|
l.start += x
|
||||||
|
@ -50,6 +66,8 @@ func (l *Location) IncStart(x int) {
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
|
// DecStart decreases the start pointer of the location by `x` with respect
|
||||||
|
// to the boundaries of the source
|
||||||
func (l *Location) DecStart(x int) {
|
func (l *Location) DecStart(x int) {
|
||||||
if l.start-x >= 0 {
|
if l.start-x >= 0 {
|
||||||
l.start -= x
|
l.start -= x
|
||||||
|
@ -59,6 +77,8 @@ func (l *Location) DecStart(x int) {
|
||||||
|
|
||||||
}
|
}
|
||||||
|
|
||||||
|
// IncEnd increases the end pointer of the location by `x` with respect
|
||||||
|
// to the boundaries of the source
|
||||||
func (l *Location) IncEnd(x int) {
|
func (l *Location) IncEnd(x int) {
|
||||||
if x+l.end < len(*l.source.Buffer) {
|
if x+l.end < len(*l.source.Buffer) {
|
||||||
l.end += x
|
l.end += x
|
||||||
|
@ -68,6 +88,8 @@ func (l *Location) IncEnd(x int) {
|
||||||
|
|
||||||
}
|
}
|
||||||
|
|
||||||
|
// DecEnd decreases the end pointer of the location by `x` with respect
|
||||||
|
// to the boundaries of the source
|
||||||
func (l *Location) DecEnd(x int) {
|
func (l *Location) DecEnd(x int) {
|
||||||
if l.end-x >= 0 {
|
if l.end-x >= 0 {
|
||||||
l.end -= x
|
l.end -= x
|
||||||
|
@ -80,10 +102,8 @@ func (l *Location) IsKnownLocaiton() bool {
|
||||||
return l.knownLocation
|
return l.knownLocation
|
||||||
}
|
}
|
||||||
|
|
||||||
type ILocatable interface {
|
// MakeLocation returns a pointer to a `Location` in the given source `input`
|
||||||
GetLocation() *Location
|
// specified by the `start` and `end` boundaries
|
||||||
}
|
|
||||||
|
|
||||||
func MakeLocation(input *Source, start int, end int) *Location {
|
func MakeLocation(input *Source, start int, end int) *Location {
|
||||||
return &Location{
|
return &Location{
|
||||||
source: *input,
|
source: *input,
|
||||||
|
|
Loading…
Reference in New Issue