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1.6 KiB

package acedoc
import (
"strings"
"sync"
)
type Document struct {
mtx sync.RWMutex
lines []string
deltas []Delta
clients []*Client
logger *Client
}
type DeltaHandler interface {
Handle([]Delta) error
}
type DeltaHandlerFunc func([]Delta) error
func (fn DeltaHandlerFunc) Handle(d []Delta) error {
return fn(d)
}
func NewString(str string) *Document {
d := &Document{
lines: strings.Split(str, "\n"),
}
return d
}
func (d *Document) nLines() uint {
n := uint(len(d.lines))
if n == 0 {
n = 1
}
return n
}
func (d Delta) nLines() uint {
n := uint(len(d.Lines))
if n == 0 {
n = 1
}
return n
}
func (d Document) line(i uint) string {
if i >= uint(len(d.lines)) {
return ""
}
return d.lines[i]
}
func (d Delta) line(i uint) string {
if i >= uint(len(d.Lines)) {
return ""
}
return d.Lines[i]
}
func (d Delta) nRows() uint {
r := d.End.Row - d.Start.Row
r += 1
if r == 0 {
return 1
}
return r
}
func (d Delta) rows() int {
r := int(d.End.Row) - int(d.Start.Row)
return r
}
func (d Delta) cols() int {
if d.Start.Row == d.End.Row {
return int(d.End.Column) - int(d.Start.Column)
} else {
return int(d.End.Column)
}
}
func (d *Document) Contents() string {
d.mtx.RLock()
defer d.mtx.RUnlock()
return d.contents()
}
func (d *Document) contents() string {
return strings.Join(d.lines, "\n")
}
type Position struct {
Row uint `json:"row"`
Column uint `json:"column"`
}
func (d *Document) InDocument(pos Position) bool {
if pos.Row > d.nLines() {
return false
}
line := d.line(pos.Row)
if pos.Column > uint(len(line)) {
return false
}
return true
}