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// Copyright (c) IPython Development Team.
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// Distributed under the terms of the Modified BSD License.
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// Completer
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//
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// Completer is be a class that takes a cell instance.
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var IPython = (function (IPython) {
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// that will prevent us from misspelling
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"use strict";
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// easier key mapping
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var keycodes = IPython.keyboard.keycodes;
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var utils = IPython.utils;
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var prepend_n_prc = function(str, n) {
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for( var i =0 ; i< n ; i++){
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str = '%'+str ;
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}
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return str;
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};
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var _existing_completion = function(item, completion_array){
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for( var i=0; i < completion_array.length; i++) {
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if (completion_array[i].trim().substr(-item.length) == item) {
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return true;
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}
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}
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return false;
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};
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// what is the common start of all completions
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function shared_start(B, drop_prct) {
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if (B.length == 1) {
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return B[0];
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}
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var A = [];
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var common;
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var min_lead_prct = 10;
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for (var i = 0; i < B.length; i++) {
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var str = B[i].str;
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var localmin = 0;
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if(drop_prct === true){
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while ( str.substr(0, 1) == '%') {
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localmin = localmin+1;
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str = str.substring(1);
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}
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}
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min_lead_prct = Math.min(min_lead_prct, localmin);
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A.push(str);
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}
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if (A.length > 1) {
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var tem1, tem2, s;
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A = A.slice(0).sort();
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tem1 = A[0];
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s = tem1.length;
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tem2 = A.pop();
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while (s && tem2.indexOf(tem1) == -1) {
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tem1 = tem1.substring(0, --s);
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}
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if (tem1 === "" || tem2.indexOf(tem1) !== 0) {
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return {
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str:prepend_n_prc('', min_lead_prct),
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type: "computed",
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from: B[0].from,
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to: B[0].to
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};
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}
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return {
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str: prepend_n_prc(tem1, min_lead_prct),
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type: "computed",
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from: B[0].from,
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to: B[0].to
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};
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}
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return null;
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}
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var Completer = function (cell) {
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this.cell = cell;
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this.editor = cell.code_mirror;
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var that = this;
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$([IPython.events]).on('status_busy.Kernel', function () {
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that.skip_kernel_completion = true;
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});
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$([IPython.events]).on('status_idle.Kernel', function () {
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that.skip_kernel_completion = false;
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});
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};
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Completer.prototype.startCompletion = function () {
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// call for a 'first' completion, that will set the editor and do some
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// special behavior like autopicking if only one completion available.
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if (this.editor.somethingSelected()) return;
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this.done = false;
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// use to get focus back on opera
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this.carry_on_completion(true);
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};
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// easy access for julia to monkeypatch
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//
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Completer.reinvoke_re = /[%0-9a-z._/\\:~-]/i;
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Completer.prototype.reinvoke= function(pre_cursor, block, cursor){
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return Completer.reinvoke_re.test(pre_cursor);
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};
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/**
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*
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* pass true as parameter if this is the first invocation of the completer
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* this will prevent the completer to dissmiss itself if it is not on a
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* word boundary like pressing tab after a space, and make it autopick the
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* only choice if there is only one which prevent from popping the UI. as
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* well as fast-forwarding the typing if all completion have a common
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* shared start
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**/
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Completer.prototype.carry_on_completion = function (first_invocation) {
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// Pass true as parameter if you want the completer to autopick when
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// only one completion. This function is automatically reinvoked at
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// each keystroke with first_invocation = false
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var cur = this.editor.getCursor();
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var line = this.editor.getLine(cur.line);
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var pre_cursor = this.editor.getRange({
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line: cur.line,
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ch: cur.ch - 1
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}, cur);
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// we need to check that we are still on a word boundary
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// because while typing the completer is still reinvoking itself
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// so dismiss if we are on a "bad" caracter
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if (!this.reinvoke(pre_cursor) && !first_invocation) {
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this.close();
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return;
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}
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this.autopick = false;
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if (first_invocation) {
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this.autopick = true;
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}
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// We want a single cursor position.
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if (this.editor.somethingSelected()) {
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return;
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}
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// one kernel completion came back, finish_completing will be called with the results
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// we fork here and directly call finish completing if kernel is busy
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var cursor_pos = utils.to_absolute_cursor_pos(this.editor, cur);
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if (this.skip_kernel_completion) {
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this.finish_completing({ content: {
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matches: [],
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cursor_start: cursor_pos,
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cursor_end: cursor_pos,
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}});
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} else {
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this.cell.kernel.complete(this.editor.getValue(), cursor_pos,
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$.proxy(this.finish_completing, this)
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);
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}
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};
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Completer.prototype.finish_completing = function (msg) {
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// let's build a function that wrap all that stuff into what is needed
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// for the new completer:
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var content = msg.content;
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var start = content.cursor_start;
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var end = content.cursor_end;
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var matches = content.matches;
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var cur = this.editor.getCursor();
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if (end === null) {
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// adapted message spec replies don't have cursor position info,
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// interpret end=null as current position,
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// and negative start relative to that
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end = utils.to_absolute_cursor_pos(this.editor, cur);
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if (start < 0) {
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start = end + start;
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}
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}
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var results = CodeMirror.contextHint(this.editor);
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var filtered_results = [];
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//remove results from context completion
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//that are already in kernel completion
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var i;
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for (i=0; i < results.length; i++) {
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if (!_existing_completion(results[i].str, matches)) {
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filtered_results.push(results[i]);
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}
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}
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// append the introspection result, in order, at at the beginning of
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// the table and compute the replacement range from current cursor
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// positon and matched_text length.
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for (i = matches.length - 1; i >= 0; --i) {
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filtered_results.unshift({
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str: matches[i],
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type: "introspection",
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from: utils.from_absolute_cursor_pos(this.editor, start),
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to: utils.from_absolute_cursor_pos(this.editor, end)
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});
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}
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// one the 2 sources results have been merge, deal with it
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this.raw_result = filtered_results;
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// if empty result return
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if (!this.raw_result || !this.raw_result.length) return;
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// When there is only one completion, use it directly.
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if (this.autopick && this.raw_result.length == 1) {
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this.insert(this.raw_result[0]);
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return;
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}
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if (this.raw_result.length == 1) {
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// test if first and only completion totally matches
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// what is typed, in this case dismiss
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var str = this.raw_result[0].str;
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var pre_cursor = this.editor.getRange({
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line: cur.line,
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ch: cur.ch - str.length
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}, cur);
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if (pre_cursor == str) {
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this.close();
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return;
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}
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}
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if (!this.visible) {
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this.complete = $('<div/>').addClass('completions');
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this.complete.attr('id', 'complete');
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// Currently webkit doesn't use the size attr correctly. See:
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// https://code.google.com/p/chromium/issues/detail?id=4579
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this.sel = $('<select/>')
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.attr('tabindex', -1)
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.attr('multiple', 'true');
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this.complete.append(this.sel);
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this.visible = true;
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$('body').append(this.complete);
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//build the container
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var that = this;
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this.sel.dblclick(function () {
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that.pick();
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});
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this.sel.focus(function () {
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that.editor.focus();
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});
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this._handle_keydown = function (cm, event) {
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that.keydown(event);
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};
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this.editor.on('keydown', this._handle_keydown);
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this._handle_keypress = function (cm, event) {
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that.keypress(event);
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};
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this.editor.on('keypress', this._handle_keypress);
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}
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this.sel.attr('size', Math.min(10, this.raw_result.length));
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// After everything is on the page, compute the postion.
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// We put it above the code if it is too close to the bottom of the page.
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var pos = this.editor.cursorCoords(
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utils.from_absolute_cursor_pos(this.editor, start)
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);
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var left = pos.left-3;
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var top;
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var cheight = this.complete.height();
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var wheight = $(window).height();
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if (pos.bottom+cheight+5 > wheight) {
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top = pos.top-cheight-4;
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} else {
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top = pos.bottom+1;
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}
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this.complete.css('left', left + 'px');
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this.complete.css('top', top + 'px');
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// Clear and fill the list.
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this.sel.text('');
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this.build_gui_list(this.raw_result);
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return true;
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};
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Completer.prototype.insert = function (completion) {
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this.editor.replaceRange(completion.str, completion.from, completion.to);
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};
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Completer.prototype.build_gui_list = function (completions) {
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for (var i = 0; i < completions.length; ++i) {
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var opt = $('<option/>').text(completions[i].str).addClass(completions[i].type);
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this.sel.append(opt);
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}
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this.sel.children().first().attr('selected', 'true');
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this.sel.scrollTop(0);
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};
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Completer.prototype.close = function () {
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this.done = true;
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$('#complete').remove();
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this.editor.off('keydown', this._handle_keydown);
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this.editor.off('keypress', this._handle_keypress);
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this.visible = false;
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};
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Completer.prototype.pick = function () {
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this.insert(this.raw_result[this.sel[0].selectedIndex]);
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this.close();
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};
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Completer.prototype.keydown = function (event) {
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var code = event.keyCode;
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var that = this;
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// Enter
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if (code == keycodes.enter) {
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CodeMirror.e_stop(event);
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this.pick();
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// Escape or backspace
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} else if (code == keycodes.esc || code == keycodes.backspace) {
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CodeMirror.e_stop(event);
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this.close();
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} else if (code == keycodes.tab) {
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//all the fastforwarding operation,
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//Check that shared start is not null which can append with prefixed completion
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// like %pylab , pylab have no shred start, and ff will result in py<tab><tab>
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// to erase py
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var sh = shared_start(this.raw_result, true);
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if (sh) {
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this.insert(sh);
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}
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this.close();
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//reinvoke self
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setTimeout(function () {
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that.carry_on_completion();
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}, 50);
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} else if (code == keycodes.up || code == keycodes.down) {
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// need to do that to be able to move the arrow
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// when on the first or last line ofo a code cell
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CodeMirror.e_stop(event);
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var options = this.sel.find('option');
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var index = this.sel[0].selectedIndex;
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if (code == keycodes.up) {
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index--;
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}
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if (code == keycodes.down) {
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index++;
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}
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index = Math.min(Math.max(index, 0), options.length-1);
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this.sel[0].selectedIndex = index;
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} else if (code == keycodes.left || code == keycodes.right) {
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this.close();
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}
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};
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Completer.prototype.keypress = function (event) {
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// FIXME: This is a band-aid.
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// on keypress, trigger insertion of a single character.
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// This simulates the old behavior of completion as you type,
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// before events were disconnected and CodeMirror stopped
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// receiving events while the completer is focused.
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var that = this;
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var code = event.keyCode;
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// don't handle keypress if it's not a character (arrows on FF)
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// or ENTER/TAB
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if (event.charCode === 0 ||
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code == keycodes.tab ||
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code == keycodes.enter
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) return;
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this.close();
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this.editor.focus();
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setTimeout(function () {
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that.carry_on_completion();
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}, 50);
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};
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IPython.Completer = Completer;
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return IPython;
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}(IPython));
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