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outputarea.js
819 lines | 26.7 KiB | application/javascript | JavascriptLexer
//----------------------------------------------------------------------------
// Copyright (C) 2008 The IPython Development Team
//
// Distributed under the terms of the BSD License. The full license is in
// the file COPYING, distributed as part of this software.
//----------------------------------------------------------------------------
//============================================================================
// OutputArea
//============================================================================
/**
* @module IPython
* @namespace IPython
* @submodule OutputArea
*/
var IPython = (function (IPython) {
"use strict";
var utils = IPython.utils;
/**
* @class OutputArea
*
* @constructor
*/
var OutputArea = function (selector, prompt_area) {
this.selector = selector;
this.wrapper = $(selector);
this.outputs = [];
this.collapsed = false;
this.scrolled = false;
this.clear_queued = null;
if (prompt_area === undefined) {
this.prompt_area = true;
} else {
this.prompt_area = prompt_area;
}
this.create_elements();
this.style();
this.bind_events();
};
OutputArea.prototype.create_elements = function () {
this.element = $("<div/>");
this.collapse_button = $("<div/>");
this.prompt_overlay = $("<div/>");
this.wrapper.append(this.prompt_overlay);
this.wrapper.append(this.element);
this.wrapper.append(this.collapse_button);
};
OutputArea.prototype.style = function () {
this.collapse_button.hide();
this.prompt_overlay.hide();
this.wrapper.addClass('output_wrapper');
this.element.addClass('output');
this.collapse_button.addClass("btn output_collapsed");
this.collapse_button.attr('title', 'click to expand output');
this.collapse_button.html('. . .');
this.prompt_overlay.addClass('out_prompt_overlay prompt');
this.prompt_overlay.attr('title', 'click to expand output; double click to hide output');
this.collapse();
};
/**
* Should the OutputArea scroll?
* Returns whether the height (in lines) exceeds a threshold.
*
* @private
* @method _should_scroll
* @param [lines=100]{Integer}
* @return {Bool}
*
*/
OutputArea.prototype._should_scroll = function (lines) {
if (lines <=0 ){ return }
if (!lines) {
lines = 100;
}
// line-height from http://stackoverflow.com/questions/1185151
var fontSize = this.element.css('font-size');
var lineHeight = Math.floor(parseInt(fontSize.replace('px','')) * 1.5);
return (this.element.height() > lines * lineHeight);
};
OutputArea.prototype.bind_events = function () {
var that = this;
this.prompt_overlay.dblclick(function () { that.toggle_output(); });
this.prompt_overlay.click(function () { that.toggle_scroll(); });
this.element.resize(function () {
// FIXME: Firefox on Linux misbehaves, so automatic scrolling is disabled
if ( IPython.utils.browser[0] === "Firefox" ) {
return;
}
// maybe scroll output,
// if it's grown large enough and hasn't already been scrolled.
if ( !that.scrolled && that._should_scroll(OutputArea.auto_scroll_threshold)) {
that.scroll_area();
}
});
this.collapse_button.click(function () {
that.expand();
});
};
OutputArea.prototype.collapse = function () {
if (!this.collapsed) {
this.element.hide();
this.prompt_overlay.hide();
if (this.element.html()){
this.collapse_button.show();
}
this.collapsed = true;
}
};
OutputArea.prototype.expand = function () {
if (this.collapsed) {
this.collapse_button.hide();
this.element.show();
this.prompt_overlay.show();
this.collapsed = false;
}
};
OutputArea.prototype.toggle_output = function () {
if (this.collapsed) {
this.expand();
} else {
this.collapse();
}
};
OutputArea.prototype.scroll_area = function () {
this.element.addClass('output_scroll');
this.prompt_overlay.attr('title', 'click to unscroll output; double click to hide');
this.scrolled = true;
};
OutputArea.prototype.unscroll_area = function () {
this.element.removeClass('output_scroll');
this.prompt_overlay.attr('title', 'click to scroll output; double click to hide');
this.scrolled = false;
};
/**
* Threshold to trigger autoscroll when the OutputArea is resized,
* typically when new outputs are added.
*
* Behavior is undefined if autoscroll is lower than minimum_scroll_threshold,
* unless it is < 0, in which case autoscroll will never be triggered
*
* @property auto_scroll_threshold
* @type Number
* @default 100
*
**/
OutputArea.auto_scroll_threshold = 100;
/**
* Lower limit (in lines) for OutputArea to be made scrollable. OutputAreas
* shorter than this are never scrolled.
*
* @property minimum_scroll_threshold
* @type Number
* @default 20
*
**/
OutputArea.minimum_scroll_threshold = 20;
/**
*
* Scroll OutputArea if height supperior than a threshold (in lines).
*
* Threshold is a maximum number of lines. If unspecified, defaults to
* OutputArea.minimum_scroll_threshold.
*
* Negative threshold will prevent the OutputArea from ever scrolling.
*
* @method scroll_if_long
*
* @param [lines=20]{Number} Default to 20 if not set,
* behavior undefined for value of `0`.
*
**/
OutputArea.prototype.scroll_if_long = function (lines) {
var n = lines | OutputArea.minimum_scroll_threshold;
if(n <= 0){
return
}
if (this._should_scroll(n)) {
// only allow scrolling long-enough output
this.scroll_area();
}
};
OutputArea.prototype.toggle_scroll = function () {
if (this.scrolled) {
this.unscroll_area();
} else {
// only allow scrolling long-enough output
this.scroll_if_long();
}
};
// typeset with MathJax if MathJax is available
OutputArea.prototype.typeset = function () {
if (window.MathJax){
MathJax.Hub.Queue(["Typeset",MathJax.Hub]);
}
};
OutputArea.prototype.handle_output = function (msg) {
var json = {};
var msg_type = json.output_type = msg.header.msg_type;
var content = msg.content;
if (msg_type === "stream") {
json.text = content.data;
json.stream = content.name;
} else if (msg_type === "display_data") {
json = content.data;
json.output_type = msg_type;
json.metadata = content.metadata;
} else if (msg_type === "pyout") {
json = content.data;
json.output_type = msg_type;
json.metadata = content.metadata;
json.prompt_number = content.execution_count;
} else if (msg_type === "pyerr") {
json.ename = content.ename;
json.evalue = content.evalue;
json.traceback = content.traceback;
}
this.append_output(json);
};
OutputArea.mime_map = {
"text/plain" : "text",
"text/html" : "html",
"image/svg+xml" : "svg",
"image/png" : "png",
"image/jpeg" : "jpeg",
"text/latex" : "latex",
"application/json" : "json",
"application/javascript" : "javascript",
};
OutputArea.mime_map_r = {
"text" : "text/plain",
"html" : "text/html",
"svg" : "image/svg+xml",
"png" : "image/png",
"jpeg" : "image/jpeg",
"latex" : "text/latex",
"json" : "application/json",
"javascript" : "application/javascript",
};
OutputArea.prototype.rename_keys = function (data, key_map) {
var remapped = {};
for (var key in data) {
var new_key = key_map[key] || key;
remapped[new_key] = data[key];
}
return remapped;
};
OutputArea.output_types = [
'application/javascript',
'text/html',
'text/latex',
'image/svg+xml',
'image/png',
'image/jpeg',
'text/plain'
];
OutputArea.prototype.validate_output = function (json) {
// scrub invalid outputs
// TODO: right now everything is a string, but JSON really shouldn't be.
// nbformat 4 will fix that.
$.map(OutputArea.output_types, function(key){
if (json[key] !== undefined && typeof json[key] !== 'string') {
console.log("Invalid type for " + key, json[key]);
delete json[key];
}
});
return json;
};
OutputArea.prototype.append_output = function (json) {
this.expand();
// Clear the output if clear is queued.
var needs_height_reset = false;
if (this.clear_queued) {
this.clear_output(false);
needs_height_reset = true;
}
// validate output data types
json = this.validate_output(json);
if (json.output_type === 'pyout') {
this.append_pyout(json);
} else if (json.output_type === 'pyerr') {
this.append_pyerr(json);
} else if (json.output_type === 'display_data') {
this.append_display_data(json);
} else if (json.output_type === 'stream') {
this.append_stream(json);
}
this.outputs.push(json);
// Only reset the height to automatic if the height is currently
// fixed (done by wait=True flag on clear_output).
if (needs_height_reset) {
this.element.height('');
}
var that = this;
setTimeout(function(){that.element.trigger('resize');}, 100);
};
OutputArea.prototype.create_output_area = function () {
var oa = $("<div/>").addClass("output_area");
if (this.prompt_area) {
oa.append($('<div/>').addClass('prompt'));
}
return oa;
};
function _get_metadata_key(metadata, key, mime) {
var mime_md = metadata[mime];
// mime-specific higher priority
if (mime_md && mime_md[key] !== undefined) {
return mime_md[key];
}
// fallback on global
return metadata[key];
}
OutputArea.prototype.create_output_subarea = function(md, classes, mime) {
var subarea = $('<div/>').addClass('output_subarea').addClass(classes);
if (_get_metadata_key(md, 'isolated', mime)) {
// Create an iframe to isolate the subarea from the rest of the
// document
var iframe = $('<iframe/>').addClass('box-flex1');
iframe.css({'height':1, 'width':'100%', 'display':'block'});
iframe.attr('frameborder', 0);
iframe.attr('scrolling', 'auto');
// Once the iframe is loaded, the subarea is dynamically inserted
iframe.on('load', function() {
// Workaround needed by Firefox, to properly render svg inside
// iframes, see http://stackoverflow.com/questions/10177190/
// svg-dynamically-added-to-iframe-does-not-render-correctly
this.contentDocument.open();
// Insert the subarea into the iframe
// We must directly write the html. When using Jquery's append
// method, javascript is evaluated in the parent document and
// not in the iframe document.
this.contentDocument.write(subarea.html());
this.contentDocument.close();
var body = this.contentDocument.body;
// Adjust the iframe height automatically
iframe.height(body.scrollHeight + 'px');
});
// Elements should be appended to the inner subarea and not to the
// iframe
iframe.append = function(that) {
subarea.append(that);
};
return iframe;
} else {
return subarea;
}
}
OutputArea.prototype._append_javascript_error = function (err, element) {
// display a message when a javascript error occurs in display output
var msg = "Javascript error adding output!"
if ( element === undefined ) return;
element.append(
$('<div/>').html(msg + "<br/>" +
err.toString() +
'<br/>See your browser Javascript console for more details.'
).addClass('js-error')
);
};
OutputArea.prototype._safe_append = function (toinsert) {
// safely append an item to the document
// this is an object created by user code,
// and may have errors, which should not be raised
// under any circumstances.
try {
this.element.append(toinsert);
} catch(err) {
console.log(err);
// Create an actual output_area and output_subarea, which creates
// the prompt area and the proper indentation.
var toinsert = this.create_output_area();
var subarea = $('<div/>').addClass('output_subarea');
toinsert.append(subarea);
this._append_javascript_error(err, subarea);
this.element.append(toinsert);
}
};
OutputArea.prototype.append_pyout = function (json) {
var n = json.prompt_number || ' ';
var toinsert = this.create_output_area();
if (this.prompt_area) {
toinsert.find('div.prompt').addClass('output_prompt').html('Out[' + n + ']:');
}
this.append_mime_type(json, toinsert);
this._safe_append(toinsert);
// If we just output latex, typeset it.
if ((json['text/latex'] !== undefined) || (json['text/html'] !== undefined)) {
this.typeset();
}
};
OutputArea.prototype.append_pyerr = function (json) {
var tb = json.traceback;
if (tb !== undefined && tb.length > 0) {
var s = '';
var len = tb.length;
for (var i=0; i<len; i++) {
s = s + tb[i] + '\n';
}
s = s + '\n';
var toinsert = this.create_output_area();
this.append_text(s, {}, toinsert);
this._safe_append(toinsert);
}
};
OutputArea.prototype.append_stream = function (json) {
// temporary fix: if stream undefined (json file written prior to this patch),
// default to most likely stdout:
if (json.stream == undefined){
json.stream = 'stdout';
}
var text = json.text;
var subclass = "output_"+json.stream;
if (this.outputs.length > 0){
// have at least one output to consider
var last = this.outputs[this.outputs.length-1];
if (last.output_type == 'stream' && json.stream == last.stream){
// latest output was in the same stream,
// so append directly into its pre tag
// escape ANSI & HTML specials:
var pre = this.element.find('div.'+subclass).last().find('pre');
var html = utils.fixCarriageReturn(
pre.html() + utils.fixConsole(text));
pre.html(html);
return;
}
}
if (!text.replace("\r", "")) {
// text is nothing (empty string, \r, etc.)
// so don't append any elements, which might add undesirable space
return;
}
// If we got here, attach a new div
var toinsert = this.create_output_area();
this.append_text(text, {}, toinsert, "output_stream "+subclass);
this._safe_append(toinsert);
};
OutputArea.prototype.append_display_data = function (json) {
var toinsert = this.create_output_area();
if (this.append_mime_type(json, toinsert)) {
this._safe_append(toinsert);
// If we just output latex, typeset it.
if ((json['text/latex'] !== undefined) || (json['text/html'] !== undefined)) {
this.typeset();
}
}
};
OutputArea.display_order = [
'application/javascript',
'text/html',
'text/latex',
'image/svg+xml',
'image/png',
'image/jpeg',
'text/plain'
];
OutputArea.prototype.append_mime_type = function (json, element) {
for (var type_i in OutputArea.display_order) {
var type = OutputArea.display_order[type_i];
var append = OutputArea.append_map[type];
if ((json[type] !== undefined) && append) {
var md = json.metadata || {};
append.apply(this, [json[type], md, element]);
return true;
}
}
return false;
};
OutputArea.prototype.append_html = function (html, md, element) {
var type = 'text/html';
var toinsert = this.create_output_subarea(md, "output_html rendered_html", type);
IPython.keyboard_manager.register_events(toinsert);
toinsert.append(html);
element.append(toinsert);
};
OutputArea.prototype.append_javascript = function (js, md, container) {
// We just eval the JS code, element appears in the local scope.
var type = 'application/javascript';
var element = this.create_output_subarea(md, "output_javascript", type);
IPython.keyboard_manager.register_events(element);
container.append(element);
try {
eval(js);
} catch(err) {
console.log(err);
this._append_javascript_error(err, element);
}
};
OutputArea.prototype.append_text = function (data, md, element, extra_class) {
var type = 'text/plain';
var toinsert = this.create_output_subarea(md, "output_text", type);
// escape ANSI & HTML specials in plaintext:
data = utils.fixConsole(data);
data = utils.fixCarriageReturn(data);
data = utils.autoLinkUrls(data);
if (extra_class){
toinsert.addClass(extra_class);
}
toinsert.append($("<pre/>").html(data));
element.append(toinsert);
};
OutputArea.prototype.append_svg = function (svg, md, element) {
var type = 'image/svg+xml';
var toinsert = this.create_output_subarea(md, "output_svg", type);
toinsert.append(svg);
element.append(toinsert);
};
OutputArea.prototype._dblclick_to_reset_size = function (img) {
// schedule wrapping image in resizable after a delay,
// so we don't end up calling resize on a zero-size object
var that = this;
setTimeout(function () {
var h0 = img.height();
var w0 = img.width();
if (!(h0 && w0)) {
// zero size, schedule another timeout
that._dblclick_to_reset_size(img);
return;
}
img.resizable({
aspectRatio: true,
autoHide: true
});
img.dblclick(function () {
// resize wrapper & image together for some reason:
img.parent().height(h0);
img.height(h0);
img.parent().width(w0);
img.width(w0);
});
}, 250);
};
OutputArea.prototype.append_png = function (png, md, element) {
var type = 'image/png';
var toinsert = this.create_output_subarea(md, "output_png", type);
var img = $("<img/>");
img[0].setAttribute('src','data:image/png;base64,'+png);
if (md['height']) {
img[0].setAttribute('height', md['height']);
}
if (md['width']) {
img[0].setAttribute('width', md['width']);
}
this._dblclick_to_reset_size(img);
toinsert.append(img);
element.append(toinsert);
};
OutputArea.prototype.append_jpeg = function (jpeg, md, element) {
var type = 'image/jpeg';
var toinsert = this.create_output_subarea(md, "output_jpeg", type);
var img = $("<img/>").attr('src','data:image/jpeg;base64,'+jpeg);
if (md['height']) {
img.attr('height', md['height']);
}
if (md['width']) {
img.attr('width', md['width']);
}
this._dblclick_to_reset_size(img);
toinsert.append(img);
element.append(toinsert);
};
OutputArea.prototype.append_latex = function (latex, md, element) {
// This method cannot do the typesetting because the latex first has to
// be on the page.
var type = 'text/latex';
var toinsert = this.create_output_subarea(md, "output_latex", type);
toinsert.append(latex);
element.append(toinsert);
};
OutputArea.append_map = {
"text/plain" : OutputArea.prototype.append_text,
"text/html" : OutputArea.prototype.append_html,
"image/svg+xml" : OutputArea.prototype.append_svg,
"image/png" : OutputArea.prototype.append_png,
"image/jpeg" : OutputArea.prototype.append_jpeg,
"text/latex" : OutputArea.prototype.append_latex,
"application/json" : OutputArea.prototype.append_json,
"application/javascript" : OutputArea.prototype.append_javascript,
};
OutputArea.prototype.append_raw_input = function (msg) {
var that = this;
this.expand();
var content = msg.content;
var area = this.create_output_area();
// disable any other raw_inputs, if they are left around
$("div.output_subarea.raw_input").remove();
area.append(
$("<div/>")
.addClass("box-flex1 output_subarea raw_input")
.append(
$("<span/>")
.addClass("input_prompt")
.text(content.prompt)
)
.append(
$("<input/>")
.addClass("raw_input")
.attr('type', 'text')
.attr("size", 47)
.keydown(function (event, ui) {
// make sure we submit on enter,
// and don't re-execute the *cell* on shift-enter
if (event.which === utils.keycodes.ENTER) {
that._submit_raw_input();
return false;
}
})
)
);
this.element.append(area);
var raw_input = area.find('input.raw_input');
// Register events that enable/disable the keyboard manager while raw
// input is focused.
IPython.keyboard_manager.register_events(raw_input);
// Note, the following line used to read raw_input.focus().focus().
// This seemed to be needed otherwise only the cell would be focused.
// But with the modal UI, this seems to work fine with one call to focus().
raw_input.focus();
}
OutputArea.prototype._submit_raw_input = function (evt) {
var container = this.element.find("div.raw_input");
var theprompt = container.find("span.input_prompt");
var theinput = container.find("input.raw_input");
var value = theinput.val();
var content = {
output_type : 'stream',
name : 'stdout',
text : theprompt.text() + value + '\n'
}
// remove form container
container.parent().remove();
// replace with plaintext version in stdout
this.append_output(content, false);
$([IPython.events]).trigger('send_input_reply.Kernel', value);
}
OutputArea.prototype.handle_clear_output = function (msg) {
this.clear_output(msg.content.wait);
};
OutputArea.prototype.clear_output = function(wait) {
if (wait) {
// If a clear is queued, clear before adding another to the queue.
if (this.clear_queued) {
this.clear_output(false);
};
this.clear_queued = true;
} else {
// Fix the output div's height if the clear_output is waiting for
// new output (it is being used in an animation).
if (this.clear_queued) {
var height = this.element.height();
this.element.height(height);
this.clear_queued = false;
}
// clear all, no need for logic
this.element.html("");
this.outputs = [];
this.unscroll_area();
return;
};
};
// JSON serialization
OutputArea.prototype.fromJSON = function (outputs) {
var len = outputs.length;
var data;
// We don't want to display javascript on load, so remove it from the
// display order for the duration of this function call, but be sure to
// put it back in there so incoming messages that contain javascript
// representations get displayed
var js_index = OutputArea.display_order.indexOf('application/javascript');
OutputArea.display_order.splice(js_index, 1);
for (var i=0; i<len; i++) {
data = outputs[i];
var msg_type = data.output_type;
if (msg_type === "display_data" || msg_type === "pyout") {
// convert short keys to mime keys
// TODO: remove mapping of short keys when we update to nbformat 4
data = this.rename_keys(data, OutputArea.mime_map_r);
data.metadata = this.rename_keys(data.metadata, OutputArea.mime_map_r);
}
this.append_output(data);
}
// reinsert javascript into display order, see note above
OutputArea.display_order.splice(js_index, 0, 'application/javascript');
};
OutputArea.prototype.toJSON = function () {
var outputs = [];
var len = this.outputs.length;
var data;
for (var i=0; i<len; i++) {
data = this.outputs[i];
var msg_type = data.output_type;
if (msg_type === "display_data" || msg_type === "pyout") {
// convert mime keys to short keys
data = this.rename_keys(data, OutputArea.mime_map);
data.metadata = this.rename_keys(data.metadata, OutputArea.mime_map);
}
outputs[i] = data;
}
return outputs;
};
IPython.OutputArea = OutputArea;
return IPython;
}(IPython));