gristlabs_grist-core/app/client/components/AceEditor.js

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var ace = require('ace-builds');
var _ = require('underscore');
// ace-builds also has a minified build (src-min-noconflict), but we don't
// use it since webpack already handles minification.
require('ace-builds/src-noconflict/mode-python');
require('ace-builds/src-noconflict/theme-chrome');
require('ace-builds/src-noconflict/theme-dracula');
require('ace-builds/src-noconflict/ext-language_tools');
var {setupAceEditorCompletions} = require('./AceEditorCompletions');
var dom = require('../lib/dom');
var dispose = require('../lib/dispose');
var modelUtil = require('../models/modelUtil');
var {gristThemeObs} = require('../ui2018/theme');
/**
* A class to help set up the ace editor with standard formatting and convenience functions
* @param {Observable} options.observable: If given, creates a 2-way binding between the observable
* and the value of the editor.
* @param {Boolean} options.saveValueOnBlurEvent: Flag to indicate whether ace editor
* should save the value on `blur` event.
* @param {Function} options.calcSize: Optional function used to resize the editor. It is called
* with (elem, desiredSize) as arguments, and should return the actual size to use for the
* element. Both desiredSize and the return value are objects with 'width' and 'height' members.
*/
function AceEditor(options) {
options = options || {};
// Observable subscription is not created until the dom is built
this.observable = options.observable || null;
this.saveValueOnBlurEvent = !(options.saveValueOnBlurEvent === false);
this.calcSize = options.calcSize || ((_elem, size) => size);
this.editorState = options.editorState || null;
this._readonly = options.readonly || false;
this._getSuggestions = options.getSuggestions || null;
this.editor = null;
this.editorDom = null;
this.session = null;
this._setupCallback = null;
this._setupTimer = null;
this.textPadding = 10; // Space after cursor when not using wrap mode
}
dispose.makeDisposable(AceEditor);
// Builds editor dom with additional setup possible in function `optSetupCallback`.
// May be called multiple times by an instance of AceEditor.
AceEditor.prototype.buildDom = function(optSetupCallback) {
this._fullDom = dom('div.code_editor_container',
this.editorDom = dom('div')
);
this._setupCallback = optSetupCallback;
this._setupTimer = setTimeout(() => this._setup(), 0);
return this._fullDom;
};
/**
* You may optionally call this once the DOM returned from buildDom is attached to the document to
* make setup and sizing more immediate.
*/
AceEditor.prototype.onAttach = function() {
if (this._setupTimer) {
clearTimeout(this._setupTimer);
this._setupTimer = null;
this._setup();
}
};
AceEditor.prototype.writeObservable = function() {
if (this.observable) {
modelUtil.setSaveValue(this.observable, this.getValue());
}
};
AceEditor.prototype.getEditor = function() {
return this.editor;
};
AceEditor.prototype.getValue = function() {
return this.editor && this.editor.getValue();
};
/**
* @param {String} val: The new value to set the editor to.
* @param {Number} optCursorPos: Position where to place the cursor: at the end if omitted.
*/
AceEditor.prototype.setValue = function(val, optCursorPos) {
// Note that underlying setValue() has a special meaning for second parameter:
// undefined or 0 is selectAll, -1 is at the document start, and 1 is at the end.
this.editor.setValue(val, optCursorPos === 0 ? -1 : 1);
if (optCursorPos > 0 && optCursorPos < val.length) {
var pos = this.session.getDocument().indexToPosition(optCursorPos);
this.editor.moveCursorTo(pos.row, pos.column);
}
};
AceEditor.prototype.isBuilt = function() {
return this.editor !== null;
};
// Enables or disables the AceEditor
AceEditor.prototype.enable = function(bool) {
var editor = this.editor;
editor.setReadOnly(!bool);
editor.renderer.$cursorLayer.element.style.opacity = bool ? 100 : 0;
editor.gotoLine(Infinity, Infinity); // Prevents text selection on disable
};
/**
* Commands must be added specially to the ace editor.
* Attaching commands to the textarea using commandGroup.attach() only
* works for certain keys.
*
* Note: Commands to the aceEditor are always enabled.
* Note: Ace defers to standard behavior when false is returned.
*/
AceEditor.prototype.attachCommandGroup = function(commandGroup) {
_.each(commandGroup.knownKeys, (commandName, key) => {
this.editor.commands.addCommand({
name: commandName,
// We are setting readonly as true to enable all commands
// in a readonly mode.
// Because FieldEditor in readonly mode will rewire all commands that
// modify state, we are safe to enable them.
readOnly: this._readonly,
bindKey: {
win: key,
mac: key,
sender: 'editor|cli'
},
// AceEditor wants a command to return true if it got handled, whereas our command returns
// true to avoid stopPropagation/preventDefault, i.e. if it hasn't been handled.
exec: () => !commandGroup.commands[commandName]()
});
});
};
/**
* Attaches a command to the editor which saves the current editor
* contents to the attached observable on 'Shift+Enter'.
* Throws error if there is no attached observable.
* TODO: Use instead of custom save command for more implementations of AceEditor
*/
AceEditor.prototype.attachSaveCommand = function() {
if (!this.observable) {
throw new Error("Cannot attach save command to editor with no bound observable");
}
this.editor.commands.addCommand({
name: 'saveFormula',
bindKey: {
sender: 'editor|cli'
},
// AceEditor wants a command to return true if it got handled
exec: () => {
this.writeObservable();
return true;
}
});
};
// Wraps words to the current width of the editor
AceEditor.prototype.adjustContentToWidth = function() {
var characterWidth = this.editor.renderer.characterWidth;
var contentWidth = this.editor.renderer.scroller.clientWidth;
if(contentWidth > 0) {
this.editor.getSession().setWrapLimit(parseInt(contentWidth/characterWidth, 10) - 1);
}
};
/**
* Provides opportunity to execute some functionality when value in the editor has changed.
* Happens every time user types something to the control.
*/
AceEditor.prototype.onChange = function() {
if (this.editorState) this.editorState.set(this.getValue());
this.resize();
};
AceEditor.prototype.setFontSize = function(pxVal) {
this.editor.setFontSize(pxVal);
this.resize();
};
AceEditor.prototype._setup = function() {
// Standard editor setup
this.editor = this.autoDisposeWith('destroy', ace.edit(this.editorDom));
if (this._getSuggestions) {
setupAceEditorCompletions(this.editor, {getSuggestions: this._getSuggestions});
}
this.editor.setOptions({
enableLiveAutocompletion: true, // use autocompletion without needing special activation.
});
this.session = this.editor.getSession();
this.session.setMode('ace/mode/python');
this._setAceTheme(gristThemeObs().get());
this.autoDispose(gristThemeObs().addListener((newTheme) => {
this._setAceTheme(newTheme);
}));
// Default line numbers to hidden
this.editor.renderer.setShowGutter(false);
this.session.setTabSize(2);
this.session.setUseWrapMode(true);
this.editor.on('change', this.onChange.bind(this));
this.editor.$blockScrolling = Infinity;
this.editor.setFontSize(11);
this.resize();
// Set up the bound observable if supplied
if (this.observable) {
var subscription = this.observable.subscribeInit(val => {if (val !== undefined) {this.setValue(val);}});
// Dispose with dom since subscription is created when dom is created
dom(this.editorDom,
dom.autoDispose(subscription)
);
if (this.saveValueOnBlurEvent) {
this.editor.on('blur', () => {
this.writeObservable();
});
}
}
if (this._setupCallback) {
this._setupCallback.call(null, this.editor);
this._setupCallback = null;
}
};
AceEditor.prototype.resize = function() {
var wrap = this.session.getUseWrapMode();
var contentWidth = wrap ? 0 : this._getContentWidth();
var contentHeight = this._getContentHeight();
var desiredSize = {
width: wrap ? 0 : contentWidth + this.textPadding,
height: contentHeight,
};
var size = this.calcSize(this._fullDom, desiredSize);
if (size.height < contentHeight) {
// Editor will show a vertical scrollbar, so recalculate to make space for it.
desiredSize.width += 20;
size = this.calcSize(this._fullDom, desiredSize);
}
if (size.width < contentWidth) {
// Editor will show a horizontal scrollbar, so recalculate to make space for it.
desiredSize.height += 20;
size = this.calcSize(this._fullDom, desiredSize);
}
// Setting height or width to number like 100.00000005 won't work (it will be truncated).
// Unfortunately ace editor will do the same math we do, and will expect the height or width
// of the container to be 100.0000005, and when it finds out that it is only 100px will show
// scrollbars. To fix this issue we will make the container a little bit bigger.
// This won't help for zooming (where the same problem occurs but in many more places), but will
// help for Windows users who have different pixel ratio.
this.editorDom.style.width = size.width ? Math.ceil(size.width) + 'px' : 'auto';
this.editorDom.style.height = size.height ? Math.ceil(size.height) + 'px' : 'auto';
this.editor.resize();
};
AceEditor.prototype._getContentWidth = function() {
return this.session.getScreenWidth() * this.editor.renderer.characterWidth;
};
AceEditor.prototype._getContentHeight = function() {
return Math.max(1, this.session.getScreenLength()) * this.editor.renderer.lineHeight;
};
AceEditor.prototype._setAceTheme = function(newTheme) {
const {appearance} = newTheme;
const aceTheme = appearance === 'dark' ? 'dracula' : 'chrome';
this.editor.setTheme(`ace/theme/${aceTheme}`);
};
let _RangeConstructor = null; //singleton, load it lazily
AceEditor.makeRange = function(a, b, c, d) {
_RangeConstructor = _RangeConstructor || ace.require('ace/range').Range;
return new _RangeConstructor(a, b, c, d);
};
module.exports = AceEditor;