Rewrite tab-complete logic to allow peeking ahead
This primarily means pre-calculating the list of things we'll be looping over and then returning matches from this list. Make the regex match be more generic rather than sorta-kinda-user-id-like-ish.
This commit is contained in:
Kegan Dougal
parent
41d4c1d14e
commit
ab0a277d94
1 changed files with 119 additions and 91 deletions
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@ -18,20 +18,22 @@ const DELAY_TIME_MS = 500;
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const KEY_TAB = 9;
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const KEY_SHIFT = 16;
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// word boundary -> 1 or more non-whitespace chars (group) -> end of line
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const MATCH_REGEX = /\b(\S+)$/;
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class TabComplete {
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constructor(opts) {
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opts.startingWordSuffix = opts.startingWordSuffix || "";
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opts.wordSuffix = opts.wordSuffix || "";
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this.opts = opts;
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this.tabStruct = {
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original: null,
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index: 0
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};
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this.completing = false;
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this.list = [];
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this.textArea = opts.textArea;
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this.list = []; // full set of tab-completable things
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this.matchedList = []; // subset of completable things to loop over
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this.currentIndex = 0; // index in matchedList currently
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this.originalText = null; // original input text when tab was first hit
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this.textArea = opts.textArea; // DOMElement
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this.isFirstWord = false; // true if you tab-complete on the first word
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}
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/**
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@ -41,99 +43,48 @@ class TabComplete {
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this.list = completeList;
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}
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/**
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* @param {DOMElement}
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*/
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setTextArea(textArea) {
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this.textArea = textArea;
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}
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/**
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* @return {Boolean}
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*/
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isTabCompleting() {
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return this.completing;
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}
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next() {
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this.tabStruct.index++;
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this.setCompletionOption();
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}
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/**
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* @param {Number} numAheadToPeek
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* @param {Number} numAheadToPeek Return *up to* this many elements.
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* @return {TabComplete.Entry[]}
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*/
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peek(numAheadToPeek) {
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var current = this.list[this.tabStruct.index];
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return [current];
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if (this.matchedList.length === 0) {
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return [];
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}
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prev() {
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this.tabStruct.index --;
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if (this.tabStruct.index < 0) {
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// wrap to the last search match, and fix up to a real index
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// value after we've matched.
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this.tabStruct.index = Number.MAX_VALUE;
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var peekList = [
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this.matchedList[this.currentIndex]
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];
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// return the current match item and then one with an index higher, and
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// so on until we've reached the requested limit OR we've looped back
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// around to our starting index.
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for (var i = 1; i < numAheadToPeek; i++) {
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var nextIndex = this.currentIndex + i;
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if (nextIndex >= this.matchedList.length) {
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// wrap around and take account of how far we've wrapped
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nextIndex -= this.matchedList.length;
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}
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this.setCompletionOption();
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// check for looping back to start
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if (nextIndex === this.currentIndex) {
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break; // no more items to return without looping
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}
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setCompletionOption() {
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var searchIndex = 0;
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var targetIndex = this.tabStruct.index;
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var text = this.tabStruct.original;
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var search = /@?([a-zA-Z0-9_\-:\.]+)$/.exec(text);
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// console.log("Searched in '%s' - got %s", text, search);
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if (targetIndex === 0) { // 0 is always the original text
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this.textArea.value = text;
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}
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else if (search && search[1]) {
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// console.log("search found: " + search+" from "+text);
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var expansion;
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// FIXME: could do better than linear search here
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for (var i=0; i < this.list.length; i++) {
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if (searchIndex < targetIndex) {
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if (this.list[i].text.toLowerCase().indexOf(search[1].toLowerCase()) === 0) {
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expansion = this.list[i].text;
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searchIndex++;
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}
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}
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}
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if (searchIndex === targetIndex || targetIndex === Number.MAX_VALUE) {
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if (search[0].length === text.length) {
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expansion += this.opts.startingWordSuffix;
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}
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else {
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expansion += this.opts.wordSuffix;
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}
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this.textArea.value = text.replace(
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/@?([a-zA-Z0-9_\-:\.]+)$/, expansion
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);
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// cancel blink
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this.textArea.style["background-color"] = "";
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if (targetIndex === Number.MAX_VALUE) {
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// wrap the index around to the last index found
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this.tabStruct.index = searchIndex;
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targetIndex = searchIndex;
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}
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}
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else {
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// console.log("wrapped!");
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this.textArea.style["background-color"] = "#faa";
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setTimeout(() => { // yay for lexical 'this'!
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this.textArea.style["background-color"] = "";
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}, 150);
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this.textArea.value = text;
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this.tabStruct.index = 0;
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}
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}
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else {
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this.tabStruct.index = 0;
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}
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}
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notifyStateChange() {
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if (this.opts.onStateChange) {
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this.opts.onStateChange(this.completing);
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peekList.push(this.matchedList[nextIndex]);
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}
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return peekList;
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}
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/**
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@ -146,8 +97,8 @@ class TabComplete {
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if (ev.keyCode !== KEY_SHIFT && this.completing) {
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// they're resuming typing; reset tab complete state vars.
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this.completing = false;
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this.tabStruct.index = 0;
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this.notifyStateChange();
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this.currentIndex = 0;
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this._notifyStateChange();
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return true;
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}
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return false;
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@ -161,23 +112,100 @@ class TabComplete {
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// init struct if necessary
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if (!this.completing) {
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this.completing = true;
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this.tabStruct.index = 0;
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// cache starting text
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this.tabStruct.original = this.textArea.value;
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this.currentIndex = 0;
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this._calculateCompletions();
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}
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if (ev.shiftKey) {
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this.prev();
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this.nextMatchedEntry(-1);
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}
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else {
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this.next();
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this.nextMatchedEntry(1);
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}
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// prevent the default TAB operation (typically focus shifting)
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ev.preventDefault();
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this.notifyStateChange();
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this._notifyStateChange();
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return true;
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}
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/**
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* Set the textarea to the next value in the matched list.
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* @param {Number} offset Offset to apply *before* setting the next value.
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*/
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nextMatchedEntry(offset) {
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if (this.matchedList.length === 0) {
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return;
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}
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var looped = false;
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// work out the new index, wrapping if necessary.
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this.currentIndex += offset;
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if (this.currentIndex >= this.matchedList.length) {
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this.currentIndex = 0;
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looped = true;
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}
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else if (this.currentIndex < 0) {
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this.currentIndex = this.matchedList.length - 1;
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}
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var suffix = "";
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if (this.currentIndex !== 0) { // don't suffix the original text!
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suffix = this.isFirstWord ? this.opts.startingWordSuffix : this.opts.wordSuffix;
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}
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// set textarea to this new value
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this.textArea.value = this._replaceWith(
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this.matchedList[this.currentIndex].text + suffix
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);
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// visual display to the user that we looped - TODO: This should be configurable
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if (looped) {
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this.textArea.style["background-color"] = "#faa";
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setTimeout(() => { // yay for lexical 'this'!
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this.textArea.style["background-color"] = "";
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}, 150);
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}
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else {
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this.textArea.style["background-color"] = ""; // cancel blinks TODO: required?
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}
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}
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_replaceWith(newVal) {
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return this.originalText.replace(MATCH_REGEX, newVal);
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}
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_calculateCompletions() {
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this.originalText = this.textArea.value; // cache starting text
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// grab the partial word from the text which we'll be tab-completing
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var res = MATCH_REGEX.exec(this.originalText);
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if (!res) {
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this.matchedList = [];
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return;
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}
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var [ ,group] = res; // ES6 destructuring; ignore first element
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this.isFirstWord = group.length === this.originalText.length;
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this.matchedList = [
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new TabComplete.Entry(group) // first entry is always the original partial
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];
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// find matching entries in the set of entries given to us
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this.list.forEach((entry) => {
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if (entry.text.toLowerCase().indexOf(group.toLowerCase()) === 0) {
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this.matchedList.push(entry);
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}
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});
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// console.log("_calculateCompletions => %s", JSON.stringify(this.matchedList));
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}
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_notifyStateChange() {
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if (this.opts.onStateChange) {
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this.opts.onStateChange(this.completing);
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}
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}
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};
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TabComplete.Entry = function(text, image) {
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