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 = "Ź";

	edits.insert_char = function(state) {
	var new_text = splice(state.text, parseInt(state.start), parseInt(state.end) - parseInt(state.start), any_char);
	return {
	text: new_text,
	start: parseInt(state.start) + 1,
	end: parseInt(state.start) + 1
	}
	}

	edits.insert_char.desc = "[letter]"
	edits.insert_char.spec = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod"

	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.delete.desc = "DEL";
	edits.delete.spec = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod"


	edits.end = function(state) {
	return {
	text: state.text,
	start: state.text.length,
	end: state.text.length
	}
	}

	edits.end.desc = "END";
	edits.end.spec = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do"

	edits.home = function(state) {
	return {
	text: state.text,
	start: 0,
	end: 0
	}
	}

	edits.home.desc = "HOME";
	edits.home.spec = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do"

	edits.ctrl_shift_end = function(state) {
	if (state.direction == "f") {
	return {
	text: state.text,
	start: state.start,
	end: state.text.length,
	direction: "f"
	}
	} else {
	return {
	text: state.text,
	start: state.end,
	end: state.text.length,
	direction: "f"
	}
	}
	}

	edits.ctrl_shift_end.desc = "CTRL+SHIFT+END";
	edits.ctrl_shift_end.spec = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do"

	edits.ctrl_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.end,
	direction: "b"
	}
	}
	}

	edits.ctrl_shift_home.desc = "CTRL+SHIFT+HOME";
	edits.ctrl_shift_home.spec = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do"

	edits.backspace = function(state) {
	if (state.end == state.start) {
	if (state.start == 0) {
	var ret = {
	text: state.text,
	start: state.start,
	end: state.start,
	direction: state.direction
	}
	if(ret.direction == undefined) delete ret.direction;
	return ret;
	}
	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.backspace.desc = "BACKSPACE";
	edits.backspace.spec = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod"

	edits.next_word = function(state) {
	if (state.start == state.end) {
	var right_half = state.text.slice(state.end, Infinity);
	var shift = 0;
	var pre_match = right_half.match("^(\\W+)\\w");
	if(pre_match != null) shift = pre_match[1].length
	right_half = right_half.slice(shift);
	var match_result = right_half.match(/\W/);
	if (match_result == null) {
	return {
	text: state.text,
	start: state.text.length,
	end: state.text.length
	}
	}
	var new_index = parseInt(state.start) + match_result.index + shift
	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.next_word.desc = "CTRL+→";
	edits.next_word.spec = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod"

	edits.prev_word = function(state) {
	if (state.start == state.end) {
	var left_half = state.text.slice(0, state.start);
	var m = left_half.replace(/\w+\W*$/g, "");
	var new_index = m.length;
	return {
	text: state.text,
	start: new_index,
	end: new_index
	}
	} else {
	return {
	text: state.text,
	start: state.start,
	end: state.start
	}
	}
	}

	edits.prev_word.desc = "CTRL+←";
	edits.prev_word.spec = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod"

	edits.select_prev_word = function(state) {
	var prev = edits.prev_word(state);
	if(state.direction == "f"){
	return {
	text: state.text,
	start: prev.start,
	end: state.start,
	direction: "b"
	}
	}else{
	if(state.start != state.end){
	prev = edits.prev_word(prev);
	}
	return {
	text: state.text,
	start: prev.start,
	end: state.end,
	direction: "b"
	}
	}
	}

	edits.select_prev_word.desc = "CTRL+SHIFT+←"
	edits.select_prev_word.spec = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed"

	edits.select_next_word = function(state){
	var next = edits.next_word(state);
	if(state.direction == "f"){
	if(state.start != state.end){
	//when you have 1 or more characters selected, ctrl+right only move the pointer to the end of the selection, not to the end of the word boundary
	next = edits.next_word(next);
	}
	return {
	text: state.text,
	start: state.start,
	end: next.start,
	direction: "f"
	}
	}else{
	return {
	text: state.text,
	start: state.end,
	end: next.start,
	direction: "f"
	}
	}
	}

	edits.select_next_word.desc = "CTRL+SHIFT+→";
	edits.select_next_word.spec = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed"

	edits.delete_prev_word = function(state) {
	if(state.start == state.end){
	state = edits.select_prev_word(state);
	}
	return edits.backspace(state);
	}

	edits.delete_prev_word.desc = "CTRL+BACKSPACE";
	edits.delete_prev_word.spec = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed"

	edits.delete_next_word = function(state){
	if(state.start == state.end){
	state = edits.select_next_word(state);
	}
	return edits["delete"](state);
	}

	edits.delete_next_word.desc = "CTRL+DEL";
	edits.delete_next_word.spec = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed"

	edits.shift_home = function(state){
	var moving_index = "start";
	if(state.direction == "f"){
	moving_index = "end";
	}
	var left_half = state.text.slice(0, state[moving_index]);
	var m = left_half.replace(/\n.*$/, "");
	var new_index = m.length + 1;
	if(m.length == left_half.length) new_index = 0;
	if(moving_index == "start"){
	return {
	text: state.text,
	start: Math.min(new_index, state.end),
	end: Math.max(new_index, state.end),
	direction: new_index < state.end? "b" : state.direction \|\| "b"
	}
	}else{
	return {
	text: state.text,
	start: Math.min(new_index, state.start),
	end: Math.max(new_index, state.start),
	direction: new_index < state.start? "b" : state.direction \|\| "b"
	}
	}
	}

	edits.shift_home.desc = "SHIFT+HOME";
	edits.shift_home.spec = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod"

	edits.shift_end = function(state){
	var moving_index = "start";
	if(state.direction == "f"){
	moving_index = "end";
	}
	var right_half = state.text.slice(state[moving_index], Infinity);
	var m = right_half;
	if(right_half.indexOf("\n")!=-1){
	m = right_half.slice(0, right_half.indexOf("\n"));
	}
	var new_index;
	new_index = Math.min(parseInt(state[moving_index]) + m.length, state.text.length);
	if(moving_index == "start"){
	return {
	text: state.text,
	start: Math.min(state.end, new_index),
	end: Math.max(state.end, new_index),
	direction: new_index > state.end ? "f" : state.direction \|\| "f"
	}
	}else{
	return {
	text: state.text,
	start: Math.min(state.start, new_index),
	end: Math.max(state.start, new_index),
	direction: new_index < state.start ? "b" : state.direction \|\| "f"
	}
	}
	}

	edits.shift_end.desc = "SHIFT+END";
	edits.shift_end.spec = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod"

	edits.select_all = function(state){
	return {
	text: state.text,
	start: 0,
	end: state.text.length,
	direction: "f",
	}
	}

	edits.select_all.desc = "CTRL+A";
	edits.select_all.spec = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod"

	edits.select_left = function(state){
	if(state.direction == "f"){
	var new_end = Math.max(state.end - 1, 0);
	return {
	text: state.text,
	start: Math.min(new_end, state.start),
	end: Math.max(new_end, state.start),
	direction: new_end < state.start ? "b" : "f"
	}
	}else{
	return {
	text: state.text,
	start: Math.max(state.start -1 , 0),
	end: state.end,
	direction: "b"
	}
	}
	}

	edits.select_left.desc = "SHIFT+←";
	edits.select_left.spec = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod"

	edits.select_right = function(state){
	if(state.direction == "b"){
	var new_start = Math.min(state.text.length, parseInt(state.start) + 1);
	return {
	text: state.text,
	start: Math.min(new_start, state.end),
	end: Math.max(new_start, state.end),
	direction: new_start > state.end ? "f" : "b"
	}
	}else{
	return {
	text: state.text,
	start: state.start,
	end: Math.min(state.text.length, parseInt(state.end) + 1),
	direction: "f",
	}
	}
	}

	edits.select_right.desc = "SHIFT+→";
	edits.select_right.spec = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod"

	edits.control_home = function(state){
	return {
	text: state.text,
	start: 0,
	end: 0
	}
	}

	edits.control_home.desc = "CTRL+HOME";
	edits.control_home.spec = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod"

	edits.control_end = function(state){
	return {
	text: state.text,
	start: state.text.length,
	end: state.text.length
	}
	}

	edits.control_end.desc = "CTRL+END";
	edits.control_end.spec = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod"

	function get_h_offset(state){
	var moving_index = "end";
	if(state.direction == "b"){
	moving_index = "start";
	}
	var left_half = state.text.slice(0, state[moving_index])
	if(left_half.lastIndexOf("\n") == "-1"){
	return state[moving_index];
	}
	var ret = left_half.slice(left_half.lastIndexOf("\n"), Infinity).length - 1;
	return ret;
	}

	function get_v_offset(state){
	var moving_index = "end";
	if(state.direction == "b"){
	moving_index = "start";
	}
	var lines = state.text.split("\n");
	var current_index = 0;
	var the_line = 0;
	for(var i in lines){
	var new_index = parseInt(current_index) + lines[i].length + 1;
	if(new_index > state[moving_index]){
	the_line = i;
	break;
	}
	current_index = new_index;
	}
	return the_line;
	}

	function hv2i(state, v, h){
	assert(!isNaN(h));
	var lines = state.text.split("\n");
	var ret = lines
	.slice(0, v)
	.map(function(a){
	return a.length + 1;
	})
	.reduce(function(a,b){
	return a + b;
	}, 0) + Math.min(h, lines[v].length);
	return ret;
	}

	edits.shift_up = function(state){
	var h_offset;
	if(state.h == undefined){
	h_offset = get_h_offset(state);
	}else{
	h_offset = state.h;
	}
	var v_offset = get_v_offset(state);
	var lines = state.text.split("\n");
	if(v_offset == 0){
	return edits.shift_home(state);
	}

	var direction;
	var new_offset = hv2i(state, v_offset-1, h_offset);
	if(state.direction== "f"){
	var start = Math.min(new_offset, state.start);
	var end = Math.max(new_offset, state.start);
	if(new_offset<state.start){
	direction = "b";
	}else{
	direction = "f";
	}
	}else{
	var start = Math.min(new_offset, state.end);
	var end = Math.max(new_offset, state.end);
	if(new_offset > state.end){
	direction = "f";
	}else{
	direction = "b";
	}
	}

	return {
	text: state.text,
	start:start,
	end: end,
	direction: direction,
	h: h_offset
	}
	}

	edits.shift_up.desc = "SHIFT+↑";
	edits.shift_up.spec = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod"

	edits.shift_down = function(state){
	var h_offset;
	if(state.h == undefined){
	h_offset = get_h_offset(state);
	}else{
	h_offset = state.h;
	}
	var v_offset = get_v_offset(state);
	var lines = state.text.split("\n");
	if(v_offset == lines.length-1){
	return edits.shift_end(state);
	}

	var direction;
	var new_offset = hv2i(state, parseInt(v_offset)+1, h_offset);
	if(state.direction== "f"){
	var start = Math.min(new_offset, state.start);
	var end = Math.max(new_offset, state.start);
	if(new_offset<state.start){
	direction = "b";
	}else{
	direction = "f";
	}
	}else{
	var start = Math.min(new_offset, state.end);
	var end = Math.max(new_offset, state.end);
	if(new_offset > state.end){
	direction = "f";
	}else{
	direction = "b";
	}
	}

	return {
	text: state.text,
	start:start,
	end: end,
	direction: direction,
	h: h_offset
	}
	}

	edits.shift_down.desc = "SHIFT+↓";
	edits.shift_down.spec = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod"


	module.exports = {
	edits: edits,
	// edits: {i: edits.insert_char, e: edits.end},
	any_char: any_char,
	get_h_offset: get_h_offset,
	get_v_offset: get_v_offset,
	hv2i: hv2i
	};

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