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text-edits.js
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text-edits.js
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var assert = require("assert")
var edits = {}
// var chars = "1234567890-=qwertyuiop[]\asdfghjkl;'zxcvbnm,./~`!@#$%^&*()_+QWERTYUIOP{}|ASDFGHJKL:\"ZXCVBNM<>?"
function splice(str, index, count, add) {
return str.slice(0, index) + (add || "") + str.slice(index + count);
}
var any_char = "𝛆";
edits.insert_char = function(state) {
var new_text = splice(state.text, state.start, state.end - state.start, any_char);
return {
text: new_text,
start: state.start + 1,
end: state.start +1
}
}
edits.delete = function(state){
if(state.start != state.end){
var new_text = splice(state.text, state.start, Math.abs(state.end-state.start), "");
return {
text: new_text,
start: state.start,
end: state.start
}
}else{
var new_text = splice(state.text, state.start, 1, "");
return {
text: new_text,
start: state.start,
end: state.end
}
}
}
edits.end = function(state){
return {
text: state.text,
start: state.text.length-1,
end: state.text.length-1
}
}
edits.home = function(state){
return {
text: state.text,
start: 0,
end: 0
}
}
edits.shift_end = function(state){
if(state.direction == "f"){
return {
text: state.text,
start: state.start,
end: state.text.length-1,
direction: "f"
}
}else{
return {
text: state.text,
start: state.end,
end: state.text.length-1,
direction: "f"
}
}
}
edits.shift_home = function(state){
if(state.direction == "f"){
return {
text: state.text,
start: 0,
end: state.start,
direction: "b"
}
}else{
return {
text: state.text,
start: 0,
end: state.start,
direction: "b"
}
}
}
edits.backspace = function(state){
if(state.end == state.start){
return {
text: splice(state.text, state.start-1, 1, ""),
start: state.start-1,
end: state.start-1
}
}else{
new_text = splice(state.text, state.start, state.end - state.start, "");
return {
text: new_text,
start: state.start,
end: state.start
}
}
}
edits.next_word = function(state){
if( state.start == state.end ){
var right_half = state.text.slice(state.end, Infinity);
var new_index = state.start + right_half.match(/\W/).index;
if(new_index == -1 ){
return {
text: state.text,
start: state.text.length,
start: state.text.length
}
}else{
return {
text: state.text,
start: new_index,
end: new_index
}
}
}else{
return {
text: state.text,
start: state.end,
end: state.end
}
}
}
edits.prev_word = function(state){
if( state.start == state.end ){
var left_half = state.text.slice(0, text_start);
var r = /\W/g;
last_index = -1;
match = null;
do{
match = r.exec(left_half);
last_index = r.lastIndex;
}while(match != null);
new_index = last_index + 1;
if(new_index == -1 ){
return {
text: state.text,
start: state.text.length,
start: state.text.length
}
}else{
return {
text: state.text,
start: new_index,
end: new_index
}
}
}else{
return {
text: state.text,
start: state.end,
end: state.end
}
}
}
module.exports = {edits: edits, any_char: any_char};

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