static/compiler.js

// Copyright (c) 2012, Matt Godbolt
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//     * Redistributions of source code must retain the above copyright notice,
//       this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

'use strict';
var $ = require('jquery');
var _ = require('underscore');
var ga = require('analytics').ga;
var colour = require('colour');
var Toggles = require('toggles');
var FontScale = require('fontscale');
var Promise = require('es6-promise').Promise;
var Components = require('components');
var LruCache = require('lru-cache');
var options = require('options');
var monaco = require('monaco');
var Alert = require('alert');
var bigInt = require('big-integer');
var local = require('./local');
var Raven = require('raven-js');
require('asm-mode');

require('selectize');

var OpcodeCache = new LruCache({
    max: 64 * 1024,
    length: function (n) {
        return JSON.stringify(n).length;
    }
});

function patchOldFilters(filters) {
    if (filters === undefined) return undefined;
    // Filters are of the form {filter: true|false¸ ...}. In older versions, we used
    // to suppress the {filter:false} form. This means we can't distinguish between
    // "filter not on" and "filter not present". In the latter case we want to default
    // the filter. In the former case we want the filter off. Filters now don't suppress
    // but there are plenty of permalinks out there with no filters set at all. Here
    // we manually set any missing filters to 'false' to recover the old behaviour of
    // "if it's not here, it's off".
    _.each(['binary', 'labels', 'directives', 'commentOnly', 'trim', 'intel'], function (oldFilter) {
        if (filters[oldFilter] === undefined) filters[oldFilter] = false;
    });
    return filters;
}

var languages = options.languages;

function Compiler(hub, container, state) {
    this.container = container;
    this.hub = hub;
    this.eventHub = hub.createEventHub();
    this.compilerService = hub.compilerService;
    this.domRoot = container.getElement();
    this.domRoot.html($('#compiler').html());
    this.id = state.id || hub.nextCompilerId();
    this.sourceEditorId = state.source || 1;
    this.settings = JSON.parse(local.get('settings', '{}'));
    this.initLang(state);
    this.initCompiler(state);
    this.infoByLang = {};
    this.deferCompiles = hub.deferred;
    this.needsCompile = false;
    this.options = state.options || options.compileOptions[this.currentLangId];
    this.source = '';
    this.assembly = [];
    this.colours = [];
    this.lastResult = {};
    this.pendingRequestSentAt = 0;
    this.nextRequest = null;
    this.optViewOpen = false;
    this.cfgViewOpen = false;
    this.wantOptInfo = state.wantOptInfo;
    this.decorations = {};
    this.prevDecorations = [];
    this.alertSystem = new Alert();
    this.alertSystem.prefixMessage = "Compiler #" + this.id + ": ";

    this.linkedFadeTimeoutId = -1;

    this.outputEditor = monaco.editor.create(this.domRoot.find('.monaco-placeholder')[0], {
        scrollBeyondLastLine: false,
        readOnly: true,
        language: 'asm',
        fontFamily: 'Consolas, "Liberation Mono", Courier, monospace',
        glyphMargin: !options.embedded,
        fixedOverflowWidgets: true,
        minimap: {
            maxColumn: 80
        },
        lineNumbersMinChars: options.embedded ? 1 : 5
    });

    this.initButtons(state);
    this.compilerPicker.selectize({
        sortField: [
            {field: '$order'},
            {field: 'name'}
        ],
        valueField: 'id',
        labelField: 'name',
        searchField: ['name'],
        optgroupField: 'group',
        optgroups: this.getGroupsInUse(),
        lockOptgroupOrder: true,
        options: _.map(this.getCurrentLangCompilers(), _.identity),
        items: this.compiler ? [this.compiler.id] : []
    }).on('change', _.bind(function (e) {
        var val = $(e.target).val();
        if (val) {
            ga('send', {
                hitType: 'event',
                eventCategory: 'SelectCompiler',
                eventAction: val
            });
            this.onCompilerChange(val);
        }
    }, this));

    this.compilerSelecrizer = this.compilerPicker[0].selectize;

    this.initLibraries(state);

    this.initEditorActions();

    this.initCallbacks();
    // Handle initial settings
    this.onSettingsChange(this.settings);
    this.sendCompiler();
    this.updateCompilerInfo();
    this.updateButtons();
    this.updateLibsDropdown();
    this.saveState();
}

Compiler.prototype.clearEditorsLinkedLines = function () {
    this.eventHub.emit('editorSetDecoration', this.sourceEditorId, -1, false);
};

Compiler.prototype.getGroupsInUse = function () {
    var currentLangCompilers = _.map(this.getCurrentLangCompilers(), _.identity);
    return _.sortBy(_.map(_.uniq(currentLangCompilers, false, function (compiler) {
        return compiler.group;
    }), function (compiler) {
        return {value: compiler.group, label: compiler.groupName || compiler.group};
    }), 'label');
};

Compiler.prototype.close = function () {
    this.eventHub.unsubscribe();
    this.eventHub.emit('compilerClose', this.id);
    this.outputEditor.dispose();
};

Compiler.prototype.initPanerButtons = function () {
    var outputConfig = _.bind(function () {
        return Components.getOutput(this.id, this.sourceEditorId);
    }, this);

    this.container.layoutManager.createDragSource(this.outputBtn, outputConfig);
    this.outputBtn.click(_.bind(function () {
        var insertPoint = this.hub.findParentRowOrColumn(this.container) ||
            this.container.layoutManager.root.contentItems[0];
        insertPoint.addChild(outputConfig);
    }, this));

    var cloneComponent = _.bind(function () {
        return {
            type: 'component',
            componentName: 'compiler',
            componentState: this.currentState()
        };
    }, this);
    var createOptView = _.bind(function () {
        return Components.getOptViewWith(this.id, this.source, this.lastResult.optOutput, this.getCompilerName(),
            this.sourceEditorId);
    }, this);

    var createAstView = _.bind(function () {
        return Components.getAstViewWith(this.id, this.source, this.lastResult.astOutput, this.getCompilerName(),
            this.sourceEditorId);
    }, this);

    var createGccDumpView = _.bind(function () {
        return Components.getGccDumpViewWith(this.id, this.getCompilerName(), this.sourceEditorId,
            this.lastResult.gccDumpOutput);
    }, this);

    var createCfgView = _.bind(function () {
        return Components.getCfgViewWith(this.id, this.sourceEditorId);
    }, this);

    var panerDropdown = this.domRoot.find('.pane-dropdown');
    var togglePannerAdder = function () {
        panerDropdown.dropdown('toggle');
    };

    this.container.layoutManager
        .createDragSource(this.domRoot.find('.btn.add-compiler'), cloneComponent)
        ._dragListener.on('dragStart', togglePannerAdder);

    this.domRoot.find('.btn.add-compiler').click(_.bind(function () {
        var insertPoint = this.hub.findParentRowOrColumn(this.container) ||
            this.container.layoutManager.root.contentItems[0];
        insertPoint.addChild(cloneComponent);
    }, this));

    this.container.layoutManager
        .createDragSource(this.optButton, createOptView)
        ._dragListener.on('dragStart', togglePannerAdder);

    this.optButton.click(_.bind(function () {
        var insertPoint = this.hub.findParentRowOrColumn(this.container) ||
            this.container.layoutManager.root.contentItems[0];
        insertPoint.addChild(createOptView);
    }, this));

    this.container.layoutManager
        .createDragSource(this.astButton, createAstView)
        ._dragListener.on('dragStart', togglePannerAdder);

    this.astButton.click(_.bind(function () {
        var insertPoint = this.hub.findParentRowOrColumn(this.container) ||
            this.container.layoutManager.root.contentItems[0];
        insertPoint.addChild(createAstView);
    }, this));

    this.container.layoutManager
        .createDragSource(this.gccDumpButton, createGccDumpView)
        ._dragListener.on('dragStart', togglePannerAdder);

    this.gccDumpButton.click(_.bind(function () {
        var insertPoint = this.hub.findParentRowOrColumn(this.container) ||
            this.container.layoutManager.root.contentItems[0];
        insertPoint.addChild(createGccDumpView);
    }, this));

    this.container.layoutManager
        .createDragSource(this.cfgButton, createCfgView)
        ._dragListener.on('dragStart', togglePannerAdder);

    this.cfgButton.click(_.bind(function () {
        var insertPoint = this.hub.findParentRowOrColumn(this.container) ||
            this.container.layoutManager.root.contentItems[0];
        insertPoint.addChild(createCfgView);
    }, this));
};

Compiler.prototype.undefer = function () {
    this.deferCompiles = false;
    if (this.needsCompile) this.compile();
};

Compiler.prototype.updateAndCalcTopBarHeight = function () {
    // If we save vertical space by hiding stuff that's OK to hide
    // when thin, then hide that stuff.
    this.hideable.show();
    var topBarHeightMax = this.topBar.outerHeight(true);
    this.hideable.hide();
    var topBarHeightMin = this.topBar.outerHeight(true);
    var topBarHeight = topBarHeightMin;
    if (topBarHeightMin === topBarHeightMax) {
        this.hideable.show();
    }

    return topBarHeight;
};

Compiler.prototype.resize = function () {
    var topBarHeight = this.updateAndCalcTopBarHeight();
    var bottomBarHeight = this.bottomBar.outerHeight(true);
    this.outputEditor.layout({
        width: this.domRoot.width(),
        height: this.domRoot.height() - topBarHeight - bottomBarHeight
    });
};

Compiler.prototype.initLang = function (state) {
    // If we don't have a language, but a compiler, find the corresponding language.
    this.currentLangId = state.lang;
    if (!this.currentLangId && state.compiler) {
        this.currentLangId = this.langOfCompiler(state.compiler);
    }
    if (!this.currentLangId && languages[this.settings.defaultLanguage]) {
        this.currentLangId = languages[this.settings.defaultLanguage].id;
    }
    if (!this.currentLangId) {
        this.currentLangId = _.keys(languages)[0];
    }
};

Compiler.prototype.initCompiler = function (state) {
    this.originalCompilerId = state.compiler;
    if (state.compiler)
        this.compiler = this.findCompiler(this.currentLangId, state.compiler);
    else
        this.compiler = this.findCompiler(this.currentLangId, options.defaultCompiler[this.currentLangId]);
    if (!this.compiler) {
        var compilers = this.compilerService.compilersByLang[this.currentLangId];
        if (compilers) this.compiler = _.values(compilers)[0];
    }
};

Compiler.prototype.initEditorActions = function () {
    this.outputEditor.addAction({
        id: 'viewsource',
        label: 'Scroll to source',
        keybindings: [monaco.KeyMod.CtrlCmd | monaco.KeyCode.F10],
        keybindingContext: null,
        contextMenuGroupId: 'navigation',
        contextMenuOrder: 1.5,
        run: _.bind(function (ed) {
            var desiredLine = ed.getPosition().lineNumber - 1;
            var source = this.assembly[desiredLine].source;
            if (source.file === null) {
                // a null file means it was the user's source
                this.eventHub.emit('editorSetDecoration', this.sourceEditorId, source.line, true);
            } else {
                // TODO: some indication this asm statement came from elsewhere
                this.eventHub.emit('editorSetDecoration', this.sourceEditorId, -1, false);
            }
        }, this)
    });

    this.outputEditor.addAction({
        id: 'viewasmdoc',
        label: 'View asm doc',
        keybindings: [monaco.KeyMod.CtrlCmd | monaco.KeyCode.F8],
        keybindingContext: null,
        contextMenuGroupId: 'help',
        contextMenuOrder: 1.5,
        run: _.bind(this.onAsmToolTip, this)
    });

    this.outputEditor.addAction({
        id: 'toggleColourisation',
        label: 'Toggle colourisation',
        keybindings: [monaco.KeyMod.CtrlCmd | monaco.KeyMod.Shift | monaco.KeyCode.F1],
        keybindingContext: null,
        run: _.bind(function () {
            this.eventHub.emit('modifySettings', {
                colouriseAsm: !this.settings.colouriseAsm
            });
        }, this)
    });

};

// Gets the filters that will actually be used (accounting for issues with binary
// mode etc).
Compiler.prototype.getEffectiveFilters = function () {
    if (!this.compiler) return {};
    var filters = this.filters.get();
    if (filters.binary && !this.compiler.supportsBinary) {
        delete filters.binary;
    }
    if (filters.execute && !this.compiler.supportsExecute) {
        delete filters.execute;
    }
    _.each(this.compiler.disabledFilters, function (filter) {
        if (filters[filter]) {
            delete filters[filter];
        }
    });
    return filters;
};

Compiler.prototype.compile = function () {
    if (this.deferCompiles) {
        this.needsCompile = true;
        return;
    }
    this.needsCompile = false;
    this.compileTimeLabel.text(' - Compiling...');
    var options = {
        userArguments: this.options,
        compilerOptions: {
            produceAst: this.astViewOpen,
            produceGccDump: {
                opened: this.gccDumpViewOpen,
                pass: this.gccDumpPassSelected,
                treeDump: this.treeDumpEnabled,
                rtlDump: this.rtlDumpEnabled
            },
            produceOptInfo: this.wantOptInfo,
            produceCfg: this.cfgViewOpen
        },
        filters: this.getEffectiveFilters()
    };
    var includeFlag = this.compiler ? this.compiler.includeFlag : '-I';
    _.each(this.availableLibs[this.currentLangId], function (lib) {
        _.each(lib.versions, function (version) {
            if (version.used) {
                _.each(version.path, function (path) {
                    options.userArguments += ' ' + includeFlag + path;
                });
            }
        });
    });
    this.compilerService.expand(this.source).then(_.bind(function (expanded) {
        var request = {
            source: expanded || '',
            compiler: this.compiler ? this.compiler.id : '',
            options: options,
            lang: this.currentLangId
        };
        if (!this.compiler) {
            this.onCompileResponse(request, errorResult('<Please select a compiler>'), false);
        } else {
            this.sendCompile(request);
        }
    }, this));
};

Compiler.prototype.sendCompile = function (request) {
    var onCompilerResponse = _.bind(this.onCompileResponse, this);

    if (this.pendingRequestSentAt) {
        // If we have a request pending, then just store this request to do once the
        // previous request completes.
        this.nextRequest = request;
        return;
    }
    this.eventHub.emit('compiling', this.id, this.compiler);
    this.pendingRequestSentAt = Date.now();
    // After a short delay, give the user some indication that we're working on their
    // compilation.
    var progress = setTimeout(_.bind(function () {
        this.setAssembly(fakeAsm('<Compiling...>'));
    }, this), 500);
    this.compilerService.submit(request)
        .then(function (x) {
            clearTimeout(progress);
            onCompilerResponse(request, x.result, x.localCacheHit);
        })
        .catch(function (x) {
            clearTimeout(progress);
            onCompilerResponse(request,
                errorResult('<Compilation failed: ' + x ? (x.code ? x.code : x) : "Unknown error" + '>'), false);
        });
};

Compiler.prototype.getBinaryForLine = function (line) {
    var obj = this.assembly[line - 1];
    if (!obj) return '<div class="address">????</div><div class="opcodes"><span class="opcode">????</span></div>';
    var address = obj.address ? obj.address.toString(16) : '';
    var opcodes = '<div class="opcodes" title="' + (obj.opcodes || []).join(' ') + '">';
    _.each(obj.opcodes, function (op) {
        opcodes += ('<span class="opcode">' + op + '</span>');
    });
    return '<div class="binary-side"><div class="address">' + address + '</div>' + opcodes + '</div></div>';
};

// TODO: use ContentWidgets? OverlayWidgets?
// Use highlight providers? hover providers? highlight providers?
Compiler.prototype.setAssembly = function (asm) {
    this.assembly = asm;
    if (!this.outputEditor || !this.outputEditor.getModel()) return;
    var currentTopLine = this.outputEditor.getCompletelyVisibleLinesRangeInViewport().startLineNumber;
    this.outputEditor.getModel().setValue(asm.length ? _.pluck(asm, 'text').join('\n') : "<No assembly generated>");
    this.outputEditor.revealLine(currentTopLine);
    var addrToAddrDiv = {};
    var decorations = [];
    _.each(this.assembly, _.bind(function (obj, line) {
        var address = obj.address ? obj.address.toString(16) : '';
        //     var div = $("<div class='address cm-number'>" + address + "</div>");
        addrToAddrDiv[address] = {div: 'moo', line: line};
    }, this));

    _.each(this.assembly, _.bind(function (obj, line) {
        if (!obj.links) return;
        _.each(obj.links, _.bind(function (link) {
            var address = link.to.toString(16);
            // var thing = $("<a href='#' class='cm-number'>" + address + "</a>");
            // this.outputEditor.markText(
            //     from, to, {replacedWith: thing[0], handleMouseEvents: false});
            var dest = addrToAddrDiv[address];
            if (dest) {
                decorations.push({
                    range: new monaco.Range(line, link.offset, line, link.offset + link.length),
                    options: {}
                });
                // var editor = this.outputEditor;
                // thing.hover(function (e) {
                //     var entered = e.type == "mouseenter";
                //     dest.div.toggleClass("highlighted", entered);
                //     thing.toggleClass("highlighted", entered);
                // });
                // thing.on('click', function (e) {
                //     editor.scrollIntoView({line: dest.line, ch: 0}, 30);
                //     dest.div.toggleClass("highlighted", false);
                //     thing.toggleClass("highlighted", false);
                //     e.preventDefault();
                // });
            }
        }, this));
    }, this));
};

function errorResult(text) {
    return {asm: fakeAsm(text), code: -1, stdout: '', stderr: ''};
}

function fakeAsm(text) {
    return [{text: text, source: null, fake: true}];
}

Compiler.prototype.onCompileResponse = function (request, result, cached) {
    // Delete trailing empty lines
    if ($.isArray(result.asm)) {
        var indexToDiscard = _.findLastIndex(result.asm, function (line) {
            return !_.isEmpty(line.text);
        });
        result.asm.splice(indexToDiscard + 1, result.asm.length - indexToDiscard);
    }
    this.lastResult = result;
    var timeTaken = Math.max(0, Date.now() - this.pendingRequestSentAt);
    var wasRealReply = this.pendingRequestSentAt > 0;
    this.pendingRequestSentAt = 0;
    ga('send', {
        hitType: 'event',
        eventCategory: 'Compile',
        eventAction: request.compiler,
        eventLabel: request.options.userArguments,
        eventValue: cached ? 1 : 0
    });
    ga('send', {
        hitType: 'timing',
        timingCategory: 'Compile',
        timingVar: request.compiler,
        timingValue: timeTaken
    });

    this.setAssembly(result.asm || fakeAsm('<No output>'));
    if (request.options.filters.binary) {
        this.setBinaryMargin();
    } else {
        this.outputEditor.updateOptions({
            lineNumbers: true,
            lineNumbersMinChars: options.embedded ? 1 : 5,
            glyphMargin: true
        });
    }
    var stdout = result.stdout || [];
    var stderr = result.stderr || [];

    var allText = _.pluck(stdout.concat(stderr), 'text').join('\n');
    var failed = result.code !== 0;
    var warns = !failed && !!allText;
    this.statusLabel
        .toggleClass('error', failed)
        .toggleClass('warning', warns);
    this.outputTextCount.text(stdout.length);
    this.outputErrorCount.text(stderr.length);
    if (this.isOutputOpened) {
        this.outputBtn.prop('title', '');
    } else {
        this.outputBtn.prop('title', allText.replace(/\x1b\[[0-9;]*m(.\[K)?/g, ''));
    }
    var timeLabelText = '';
    if (cached) {
        timeLabelText = ' - cached';
    } else if (wasRealReply) {
        timeLabelText = ' - ' + timeTaken + 'ms';
    }

    if (result.asmSize !== undefined) {
        timeLabelText += ' (' + result.asmSize + 'B)';
    }

    this.compileTimeLabel.text(timeLabelText);

    this.eventHub.emit('compileResult', this.id, this.compiler, result, languages[this.currentLangId]);
    this.updateButtons();
    if (result.compilationOptions) {
        this.prependOptions.prop('title', result.compilationOptions.join(' '));
        this.prependOptions.show();
    } else {
        this.prependOptions.prop('title', '');
        this.prependOptions.hide();
    }

    if (this.nextRequest) {
        var next = this.nextRequest;
        this.nextRequest = null;
        this.sendCompile(next);
    }
};

Compiler.prototype.setBinaryMargin = function () {
    this.outputEditor.updateOptions({
        lineNumbers: _.bind(this.getBinaryForLine, this),
        lineNumbersMinChars: 20,
        glyphMargin: false
    });
    this.outputEditor._configuration._validatedOptions.lineNumbersMinChars = 20;
    this.outputEditor._configuration._recomputeOptions();
};

Compiler.prototype.onEditorChange = function (editor, source, langId, compilerId) {
    if (editor === this.sourceEditorId && langId === this.currentLangId &&
        (compilerId === undefined || compilerId === this.id)) {
        this.source = source;
        this.compile();
    }
};

Compiler.prototype.onOutputOpened = function (compilerId) {
    if (this.id === compilerId) {
        this.isOutputOpened = true;
        this.outputBtn.prop('disabled', true);
        this.resendResult();
    }
};

Compiler.prototype.onOutputClosed = function (compilerId) {
    if (this.id === compilerId) {
        this.isOutputOpened = false;
        this.outputBtn.prop('disabled', false);
    }
};

Compiler.prototype.onOptViewClosed = function (id) {
    if (this.id === id) {
        this.wantOptInfo = false;
        this.optViewOpen = false;
        this.optButton.prop('disabled', this.optViewOpen);
    }
};

Compiler.prototype.onAstViewOpened = function (id) {
    if (this.id === id) {
        this.astButton.prop('disabled', true);
        this.astViewOpen = true;
        this.compile();
    }
};

Compiler.prototype.onAstViewClosed = function (id) {
    if (this.id === id) {
        this.astButton.prop('disabled', false);
        this.astViewOpen = false;
    }
};

Compiler.prototype.onGccDumpUIInit = function (id) {
    if (this.id === id) {
        this.compile();
    }
};

Compiler.prototype.onGccDumpFiltersChanged = function (id, filters, reqCompile) {
    if (this.id === id) {
        this.treeDumpEnabled = (filters.treeDump !== false);
        this.rtlDumpEnabled = (filters.rtlDump !== false);

        if (reqCompile) {
            this.compile();
        }
    }
};

Compiler.prototype.onGccDumpPassSelected = function (id, passId, reqCompile) {
    if (this.id === id) {
        this.gccDumpPassSelected = passId;

        if (reqCompile && passId !== '') {
            this.compile();
        }
    }
};

Compiler.prototype.onGccDumpViewOpened = function (id) {
    if (this.id === id) {
        this.gccDumpButton.prop('disabled', true);
        this.gccDumpViewOpen = true;
    }
};

Compiler.prototype.onGccDumpViewClosed = function (id) {
    if (this.id === id) {
        this.gccDumpButton.prop('disabled', !this.compiler.supportsGccDump);
        this.gccDumpViewOpen = false;

        delete this.gccDumpPassSelected;
        delete this.treeDumpEnabled;
        delete this.rtlDumpEnabled;
    }
};

Compiler.prototype.onOptViewOpened = function (id) {
    if (this.id === id) {
        this.optViewOpen = true;
        this.wantOptInfo = true;
        this.optButton.prop('disabled', this.optViewOpen);
        this.compile();
    }
};

Compiler.prototype.onCfgViewOpened = function (id) {
    if (this.id === id) {
        this.cfgButton.prop('disabled', true);
        this.cfgViewOpen = true;
        this.compile();
    }
};

Compiler.prototype.onCfgViewClosed = function (id) {
    if (this.id === id) {
        this.cfgViewOpen = false;
        this.cfgButton.prop('disabled', this.getEffectiveFilters().binary);
    }
};

Compiler.prototype.initButtons = function (state) {
    this.filters = new Toggles(this.domRoot.find('.filters'), patchOldFilters(state.filters));
    this.fontScale = new FontScale(this.domRoot, state, this.outputEditor);

    this.optButton = this.domRoot.find('.btn.view-optimization');
    this.astButton = this.domRoot.find('.btn.view-ast');
    this.gccDumpButton = this.domRoot.find('.btn.view-gccdump');
    this.cfgButton = this.domRoot.find('.btn.view-cfg');
    this.libsButton = this.domRoot.find('.btn.show-libs');

    this.compileTimeLabel = this.domRoot.find('.compile-time');
    this.compileClearCache = this.domRoot.find('.clear-cache');

    this.outputBtn = this.domRoot.find('.output-btn');
    this.outputTextCount = this.domRoot.find('span.text-count');
    this.outputErrorCount = this.domRoot.find('span.err-count');

    this.libsTemplates = $('.template #libs-dropdown');
    this.noLibsPanel = this.libsTemplates.children('.no-libs');

    this.optionsField = this.domRoot.find('.options');
    this.prependOptions = this.domRoot.find('.prepend-options');

    this.filterBinaryButton = this.domRoot.find("[data-bind='binary']");
    this.filterBinaryTitle = this.filterBinaryButton.prop('title');

    this.filterExecuteButton = this.domRoot.find("[data-bind='execute']");
    this.filterExecuteTitle = this.filterExecuteButton.prop('title');

    this.filterLabelsButton = this.domRoot.find("[data-bind='labels']");
    this.filterLabelsTitle = this.filterLabelsButton.prop('title');

    this.filterDirectivesButton = this.domRoot.find("[data-bind='directives']");
    this.filterDirectivesTitle = this.filterDirectivesButton.prop('title');

    this.filterCommentsButton = this.domRoot.find("[data-bind='commentOnly']");
    this.filterCommentsTitle = this.filterCommentsButton.prop('title');

    this.filterTrimButton = this.domRoot.find("[data-bind='trim']");
    this.filterTrimTitle = this.filterTrimButton.prop('title');

    this.filterIntelButton = this.domRoot.find("[data-bind='intel']");
    this.filterIntelTitle = this.filterIntelButton.prop('title');

    this.filterDemangleButton = this.domRoot.find("[data-bind='demangle']");
    this.filterDemangleTitle = this.filterDemangleButton.prop('title');

    this.noBinaryFiltersButtons = this.domRoot.find('.nonbinary');
    this.filterExecuteButton.toggle(options.supportsExecute);
    this.optionsField.val(this.options);

    this.fullCompilerName = this.domRoot.find('.full-compiler-name');
    this.compilerPicker = this.domRoot.find('.compiler-picker');

    this.topBar = this.domRoot.find('.top-bar');
    this.bottomBar = this.domRoot.find('.bottom-bar');
    this.statusLabel = this.domRoot.find('.status');

    this.hideable = this.domRoot.find('.hideable');

    this.initPanerButtons();
};

Compiler.prototype.markLibraryAsUsed = function (name, version) {
    if (this.availableLibs[this.currentLangId] &&
        this.availableLibs[this.currentLangId][name] &&
        this.availableLibs[this.currentLangId][name].versions[version]) {

        this.availableLibs[this.currentLangId][name].versions[version].used = true;
    }
};

Compiler.prototype.initLibraries = function (state) {
    this.availableLibs = {};
    this.updateAvailableLibs();
    _.each(state.libs, _.bind(function (lib) {
        this.markLibraryAsUsed(lib.name, lib.ver);
    }, this));
};

Compiler.prototype.updateAvailableLibs = function () {
    if (!this.availableLibs[this.currentLangId]) {
        this.availableLibs[this.currentLangId] = $.extend(true, {}, options.libs[this.currentLangId]);
        this.initLangDefaultLibs();
    }
};

Compiler.prototype.initLangDefaultLibs = function () {
    var defaultLibs = options.defaultLibs[this.currentLangId];
    _.each(defaultLibs.split(':'), _.bind(function (libPair) {
        var pairSplits = libPair.split('.');
        if (pairSplits.length === 2) {
            var lib = pairSplits[0];
            var ver = pairSplits[1];
            this.markLibraryAsUsed(lib, ver);
        }
    }, this));
};

Compiler.prototype.updateButtons = function () {
    if (!this.compiler) return;
    var filters = this.getEffectiveFilters();
    // We can support intel output if the compiler supports it, or if we're compiling
    // to binary (as we can disassemble it however we like).
    var formatFilterTitle = function (button, title) {
        button.prop('title', '[' + (button.hasClass('active') ? 'ON' : 'OFF') + '] ' + title +
            (button.prop('disabled') ? ' [LOCKED]' : ''));
    };
    var isIntelFilterDisabled = !this.compiler.supportsIntel && !filters.binary;
    this.filterIntelButton.prop('disabled', isIntelFilterDisabled);
    formatFilterTitle(this.filterIntelButton, this.filterIntelTitle);
    // Disable binary support on compilers that don't work with it.
    this.filterBinaryButton.prop('disabled', !this.compiler.supportsBinary);
    formatFilterTitle(this.filterBinaryButton, this.filterBinaryTitle);
    this.filterExecuteButton.prop('disabled', !this.compiler.supportsExecute);
    formatFilterTitle(this.filterExecuteButton, this.filterExecuteTitle);
    // Disable demangle for compilers where we can't access it
    this.filterDemangleButton.prop('disabled', !this.compiler.supportsDemangle);
    formatFilterTitle(this.filterDemangleButton, this.filterDemangleTitle);
    // Disable any of the options which don't make sense in binary mode.
    var noBinaryFiltersDisabled = !!filters.binary && !this.compiler.supportsFiltersInBinary;
    this.noBinaryFiltersButtons.prop('disabled', noBinaryFiltersDisabled);

    this.filterLabelsButton.prop('disabled', this.compiler.disabledFilters.indexOf('labels') !== -1);
    formatFilterTitle(this.filterLabelsButton, this.filterLabelsTitle);
    this.filterDirectivesButton.prop('disabled', this.compiler.disabledFilters.indexOf('directives') !== -1);
    formatFilterTitle(this.filterDirectivesButton, this.filterDirectivesTitle);
    this.filterCommentsButton.prop('disabled', this.compiler.disabledFilters.indexOf('commentOnly') !== -1);
    formatFilterTitle(this.filterCommentsButton, this.filterCommentsTitle);
    this.filterTrimButton.prop('disabled', this.compiler.disabledFilters.indexOf('trim') !== -1);
    formatFilterTitle(this.filterTrimButton, this.filterTrimTitle);

    // If its already open, we should turn it off.
    // The pane will update with error text
    // Otherwise we just disable the button.
    if (!this.optViewOpen) {
        this.optButton.prop('disabled', !this.compiler.supportsOptOutput);
    } else {
        this.optButton.prop('disabled', true);
    }

    if (!this.astViewOpen) {
        this.astButton.prop('disabled', !this.compiler.supportsAstView);
    } else {
        this.astButton.prop('disabled', true);
    }

    if (!this.cfgViewOpen) {
        this.cfgButton.prop('disabled', !this.compiler.supportsCfg);
    } else {
        this.cfgButton.prop('disabled', true);
    }

    if (!this.gccDumpViewOpen) {
        this.gccDumpButton.prop('disabled', !this.compiler.supportsGccDump);
    } else {
        this.gccDumpButton.prop('disabled', true);
    }
};

Compiler.prototype.onFontScale = function () {
    if (this.getEffectiveFilters().binary) {
        this.setBinaryMargin();
    }
    this.saveState();
};

Compiler.prototype.initCallbacks = function () {
    this.filters.on('change', _.bind(this.onFilterChange, this));
    this.fontScale.on('change', _.bind(this.onFontScale, this));

    this.container.on('destroy', this.close, this);
    this.container.on('resize', this.resize, this);
    this.container.on('shown', this.resize, this);
    this.container.on('open', function () {
        this.eventHub.emit('compilerOpen', this.id, this.sourceEditorId);
    }, this);
    this.eventHub.on('editorChange', this.onEditorChange, this);
    this.eventHub.on('editorClose', this.onEditorClose, this);
    this.eventHub.on('colours', this.onColours, this);
    this.eventHub.on('resendCompilation', this.onResendCompilation, this);
    this.eventHub.on('findCompilers', this.sendCompiler, this);
    this.eventHub.on('compilerSetDecorations', this.onCompilerSetDecorations, this);
    this.eventHub.on('settingsChange', this.onSettingsChange, this);

    this.eventHub.on('optViewOpened', this.onOptViewOpened, this);
    this.eventHub.on('optViewClosed', this.onOptViewClosed, this);
    this.eventHub.on('astViewOpened', this.onAstViewOpened, this);
    this.eventHub.on('astViewClosed', this.onAstViewClosed, this);
    this.eventHub.on('outputOpened', this.onOutputOpened, this);
    this.eventHub.on('outputClosed', this.onOutputClosed, this);

    this.eventHub.on('gccDumpPassSelected', this.onGccDumpPassSelected, this);
    this.eventHub.on('gccDumpFiltersChanged', this.onGccDumpFiltersChanged, this);
    this.eventHub.on('gccDumpViewOpened', this.onGccDumpViewOpened, this);
    this.eventHub.on('gccDumpViewClosed', this.onGccDumpViewClosed, this);
    this.eventHub.on('gccDumpUIInit', this.onGccDumpUIInit, this);

    this.eventHub.on('cfgViewOpened', this.onCfgViewOpened, this);
    this.eventHub.on('cfgViewClosed', this.onCfgViewClosed, this);
    this.eventHub.on('resize', this.resize, this);
    this.eventHub.on('requestFilters', function (id) {
        if (id === this.id) {
            this.eventHub.emit('filtersChange', this.id, this.getEffectiveFilters());
        }
    }, this);
    this.eventHub.on('requestCompiler', function (id) {
        if (id === this.id) {
            this.sendCompiler();
        }
    }, this);
    this.eventHub.on('languageChange', this.onLanguageChange, this);

    var optionsChange = _.debounce(_.bind(function (e) {
        this.onOptionsChange($(e.target).val());
    }, this), 800);

    this.optionsField
        .on('change', optionsChange)
        .on('keyup', optionsChange);

    this.mouseMoveThrottledFunction = _.throttle(_.bind(this.onMouseMove, this), 250);
    this.outputEditor.onMouseMove(_.bind(function (e) {
        this.mouseMoveThrottledFunction(e);
        if (this.linkedFadeTimeoutId !== -1) {
            clearTimeout(this.linkedFadeTimeoutId);
            this.linkedFadeTimeoutId = -1;
        }
    }, this));

    this.outputEditor.onMouseLeave(_.bind(function () {
        this.linkedFadeTimeoutId = setTimeout(_.bind(function () {
            this.clearEditorsLinkedLines();
            this.linkedFadeTimeoutId = -1;
        }, this), 5000);
    }, this));

    this.outputEditor.onMouseUp(_.bind(function () {
        if (this.getEffectiveFilters().binary) {
            this.setBinaryMargin();
        }
    }, this));

    this.outputEditor.onContextMenu(_.bind(function () {
        if (this.getEffectiveFilters().binary) {
            this.setBinaryMargin();
        }
    }, this));

    this.compileClearCache.on('click', _.bind(function () {
        this.compilerService.cache.reset();
        this.compile();
    }, this));

    // Dismiss the popover on escape.
    $(document).on('keyup.editable', _.bind(function (e) {
        if (e.which === 27) {
            this.libsButton.popover('hide');
        }
    }, this));

    // Dismiss on any click that isn't either in the opening element, inside
    // the popover or on any alert
    $(document).on('click', _.bind(function (e) {
        var elem = this.libsButton;
        var target = $(e.target);
        if (!target.is(elem) && elem.has(target).length === 0 && target.closest('.popover').length === 0) {
            elem.popover('hide');
        }
    }, this));

    this.eventHub.on('initialised', this.undefer, this);
};

Compiler.prototype.onOptionsChange = function (options) {
    this.options = options;
    this.saveState();
    this.compile();
    this.updateButtons();
    this.sendCompiler();
};

Compiler.prototype.updateCompilerInfo = function () {
    this.updateCompilerName();
    if (this.compiler) {
        if (this.compiler.notification) {
            this.alertSystem.notify(this.compiler.notification, {
                group: 'compilerwarning',
                alertClass: 'notification-info',
                dismissTime: 5000
            });
        }
        this.prependOptions.prop('title', this.compiler.options);
        this.prependOptions.toggle(!!this.compiler.options);
    }
};

Compiler.prototype.updateCompilerUI = function () {
    this.updateButtons();
    this.updateCompilerInfo();
    // Resize in case the new compiler name is too big
    this.resize();
};

Compiler.prototype.onCompilerChange = function (value) {
    this.compiler = this.compilerService.findCompiler(this.currentLangId, value);
    this.saveState();
    this.compile();
    this.updateCompilerUI();
    this.sendCompiler();
};

Compiler.prototype.sendCompiler = function () {
    this.eventHub.emit('compiler', this.id, this.compiler, this.options, this.sourceEditorId);
};

Compiler.prototype.onEditorClose = function (editor) {
    if (editor === this.sourceEditorId) {
        // We can't immediately close as an outer loop somewhere in GoldenLayout is iterating over
        // the hierarchy. We can't modify while it's being iterated over.
        this.close();
        _.defer(function (self) {
            self.container.close();
        }, this);
    }
};

Compiler.prototype.onFilterChange = function () {
    this.eventHub.emit('filtersChange', this.id, this.getEffectiveFilters());
    this.saveState();
    this.compile();
    this.updateButtons();
};

Compiler.prototype.currentState = function () {
    var libs = [];
    _.each(this.availableLibs[this.currentLangId], function (library, name) {
        _.each(library.versions, function (version, ver) {
            if (library.versions[ver].used) {
                libs.push({name: name, ver: ver});
            }
        });
    });
    var state = {
        compiler: this.compiler ? this.compiler.id : '',
        source: this.sourceEditorId,
        options: this.options,
        // NB must *not* be effective filters
        filters: this.filters.get(),
        wantOptInfo: this.wantOptInfo,
        libs: libs,
        lang: this.currentLangId
    };
    this.fontScale.addState(state);
    return state;
};

Compiler.prototype.saveState = function () {
    this.container.setState(this.currentState());
};

Compiler.prototype.onColours = function (editor, colours, scheme) {
    if (editor === this.sourceEditorId) {
        var asmColours = {};
        _.each(this.assembly, function (x, index) {
            if (x.source && x.source.file === null && x.source.line > 0) {
                asmColours[index] = colours[x.source.line - 1];
            }
        });
        this.colours = colour.applyColours(this.outputEditor, asmColours, scheme, this.colours);
    }
};

Compiler.prototype.getCompilerName = function () {
    return this.compiler ? this.compiler.name : 'No compiler set';
};

Compiler.prototype.updateCompilerName = function () {
    var name = options.languages[this.currentLangId].name;
    var compilerName = this.getCompilerName();
    var compilerVersion = this.compiler ? this.compiler.version : '';
    this.container.setTitle(compilerName + ' (Editor #' + this.sourceEditorId + ', Compiler #' + this.id + ') ' + name);
    this.fullCompilerName.text(compilerVersion);
};

Compiler.prototype.resendResult = function () {
    if (!$.isEmptyObject(this.lastResult)) {
        this.eventHub.emit('compileResult', this.id, this.compiler, this.lastResult);
        return true;
    }
    return false;
};

Compiler.prototype.onResendCompilation = function (id) {
    if (id === this.id) {
        this.resendResult();
    }
};

Compiler.prototype.updateDecorations = function () {
    this.prevDecorations = this.outputEditor.deltaDecorations(
        this.prevDecorations, _.flatten(_.values(this.decorations)));
};

Compiler.prototype.onCompilerSetDecorations = function (id, lineNums, revealLine) {
    if (Number(id) === this.id) {
        if (revealLine && lineNums[0]) this.outputEditor.revealLineInCenter(lineNums[0]);
        this.decorations.linkedCode = _.map(lineNums, function (line) {
            return {
                range: new monaco.Range(line, 1, line, 1),
                options: {
                    isWholeLine: true,
                    linesDecorationsClassName: 'linked-code-decoration-margin',
                    inlineClassName: 'linked-code-decoration-inline'
                }
            };
        });
        this.updateDecorations();
    }
};

Compiler.prototype.onSettingsChange = function (newSettings) {
    var before = this.settings;
    this.settings = _.clone(newSettings);
    if (!before.lastHoverShowSource && this.settings.hoverShowSource) {
        this.onCompilerSetDecorations(this.id, []);
    }
    this.outputEditor.updateOptions({
        contextmenu: this.settings.useCustomContextMenu,
        minimap: {
            enabled: this.settings.showMinimap && !options.embedded
        }
    });
};

var hexLike = /^(#?[$]|0x)([0-9a-fA-F]+)$/;
var hexLike2 = /^(#?)([0-9a-fA-F]+)H$/;
var decimalLike = /^(#?)(-?[0-9]+)$/;

function getNumericToolTip(value) {
    var match = hexLike.exec(value) || hexLike2.exec(value);
    if (match) {
        return value + ' = ' + bigInt(match[2], 16).toString(10);
    }
    match = decimalLike.exec(value);
    if (match) {
        var asBig = bigInt(match[2]);
        if (asBig.isNegative()) {
            asBig = bigInt('ffffffffffffffff', 16).and(asBig);
        }
        return value + ' = 0x' + asBig.toString(16).toUpperCase();
    }

    return null;
}

function getAsmInfo(opcode) {
    var cacheName = 'asm/' + opcode;
    var cached = OpcodeCache.get(cacheName);
    if (cached) {
        return Promise.resolve(cached.found ? cached.result : null);
    }
    return new Promise(function (resolve, reject) {
        $.ajax({
            type: 'GET',
            url: 'api/asm/' + opcode,
            dataType: 'json',  // Expected,
            contentType: 'text/plain',  // Sent
            success: function (result) {
                OpcodeCache.set(cacheName, result);
                resolve(result.found ? result.result : null);
            },
            error: function (result) {
                reject(result);
            },
            cache: true
        });
    });
}

Compiler.prototype.onMouseMove = function (e) {
    if (e === null || e.target === null || e.target.position === null) return;
    if (this.settings.hoverShowSource === true && this.assembly) {
        var hoverAsm = this.assembly[e.target.position.lineNumber - 1];
        if (hoverAsm) {
            // We check that we actually have something to show at this point!
            this.eventHub.emit('editorSetDecoration', this.sourceEditorId, hoverAsm.source && !hoverAsm.source.file ?
                hoverAsm.source.line : -1, false);
        }
    }
    var currentWord = this.outputEditor.getModel().getWordAtPosition(e.target.position);
    if (currentWord && currentWord.word) {
        var word = currentWord.word;
        var startColumn = currentWord.startColumn;
        // Avoid throwing an exception if somehow (How?) we have a non existent lineNumber.
        // c.f. https://sentry.io/matt-godbolt/compiler-explorer/issues/285270358/
        if (e.target.position.lineNumber < this.outputEditor.getModel().getLineCount()) {
            // Hacky workaround to check for negative numbers.
            // c.f. https://github.com/mattgodbolt/compiler-explorer/issues/434
            var lineContent = this.outputEditor.getModel().getLineContent(e.target.position.lineNumber);
            if (lineContent[currentWord.startColumn - 2] === '-') {
                word = '-' + word;
                startColumn -= 1;
            }
        }
        currentWord.range = new monaco.Range(e.target.position.lineNumber, Math.max(startColumn, 1),
            e.target.position.lineNumber, currentWord.endColumn);
        var numericToolTip = getNumericToolTip(word);
        if (numericToolTip) {
            this.decorations.numericToolTip = {
                range: currentWord.range,
                options: {isWholeLine: false, hoverMessage: ['`' + numericToolTip + '`']}
            };
            this.updateDecorations();
        }

        var getTokensForLine = function (model, line) {
            //Force line's state to be accurate
            if (line > model.getLineCount()) return [];
            model.getLineTokens(line, /*inaccurateTokensAcceptable*/false);
            // Get the tokenization state at the beginning of this line
            var state = model._lines[line - 1].getState();
            if (!state) return [];
            var freshState = model._lines[line - 1].getState().clone();
            // Get the human readable tokens on this line
            return model._tokenizationSupport.tokenize(model.getLineContent(line), freshState, 0).tokens;
        };

        if (this.settings.hoverShowAsmDoc === true &&
            _.some(getTokensForLine(this.outputEditor.getModel(), currentWord.range.startLineNumber), function (t) {
                return t.offset + 1 === currentWord.startColumn && t.type === 'keyword.asm';
            })) {
            getAsmInfo(currentWord.word).then(_.bind(function (response) {
                if (!response) return;
                this.decorations.asmToolTip = {
                    range: currentWord.range,
                    options: {
                        isWholeLine: false,
                        hoverMessage: [response.tooltip + '\n\nMore information available in the context menu.']
                    }
                };
                this.updateDecorations();
            }, this));
        }
    }
};

Compiler.prototype.onAsmToolTip = function (ed) {
    var pos = ed.getPosition();
    var word = ed.getModel().getWordAtPosition(pos);
    if (!word || !word.word) return;
    var opcode = word.word.toUpperCase();

    function appendInfo(url) {
        return '<br><br>For more information, visit <a href="' + url +
            '" target="_blank" rel="noopener noreferrer">the ' + opcode +
            ' documentation <sup><small class="glyphicon glyphicon-new-window opens-new-window"' +
            ' title="Opens in a new window"></small></sup></a>.';
    }

    getAsmInfo(word.word).then(_.bind(function (asmHelp) {
        if (asmHelp) {
            this.alertSystem.alert(opcode + ' help', asmHelp.html + appendInfo(asmHelp.url), function () {
                ed.focus();
                ed.setPosition(pos);
            });
        } else {
            this.alertSystem.notify('This token was not found in the documentation. Sorry!', {
                group: 'notokenindocs',
                alertClass: 'notification-error',
                dismissTime: 3000
            });
        }
    }, this), _.bind(function (rejection) {
        this.alertSystem
            .notify('There was an error fetching the documentation for this opcode (' + rejection + ').', {
                group: 'notokenindocs',
                alertClass: 'notification-error',
                dismissTime: 3000
            });
    }, this));
};

Compiler.prototype.updateLibsDropdown = function () {
    this.updateAvailableLibs();
    this.libsButton.popover({
        container: 'body',
        content: _.bind(function () {
            var libsCount = _.keys(this.availableLibs[this.currentLangId]).length;
            if (libsCount === 0) return this.noLibsPanel;
            var columnCount = Math.ceil(libsCount / 5);
            var currentLibIndex = -1;

            var libLists = [];
            for (var i = 0; i < columnCount; i++) {
                libLists.push($('<ul></ul>').addClass('lib-list'));
            }

            // Utility function so we can iterate indefinitely over our lists
            var getNextList = function () {
                currentLibIndex = (currentLibIndex + 1) % columnCount;
                return libLists[currentLibIndex];
            };

            var handleArrow = function (libGroup, libArrow) {
                var anyInUse = _.any(libGroup.children().children('input'), function (element) {
                    return $(element).prop('checked');
                });
                var isVisible = libGroup.is(":visible");

                libArrow.toggleClass('lib-arrow-up', isVisible);
                libArrow.toggleClass('lib-arrow-down', !isVisible);
                libArrow.toggleClass('lib-arrow-used', anyInUse);
            };

            var onChecked = _.bind(function (e) {
                var elem = $(e.target);
                // Uncheck every lib checkbox with the same name if we're checking the target
                if (elem.prop('checked')) {
                    _.each(e.data.group.children().children('input'), function (other) {
                        $(other).prop('checked', false);
                    });
                    // Recheck the targeted one
                    elem.prop('checked', true);
                }
                // And now do the same with the availableLibs object
                _.each(this.availableLibs[this.currentLangId][elem.prop('data-lib')].versions, function (version) {
                    version.used = false;
                });
                this.availableLibs[this.currentLangId][elem.prop('data-lib')]
                    .versions[elem.prop('data-version')].used = elem.prop('checked');

                handleArrow(e.data.group, e.data.arrow);

                this.saveState();
                this.compile();
            }, this);

            _.each(this.availableLibs[this.currentLangId], function (lib, libKey) {
                var libsList = getNextList();
                var libArrow = $('<div></div>').addClass('lib-arrow');
                var libName = $('<span></span>').text(lib.name);
                var libHeader = $('<span></span>')
                    .addClass('lib-header')
                    .append(libArrow)
                    .append(libName);
                if (lib.url && lib.url.length > 0) {
                    libHeader.append($('<a></a>')
                        .css("float", "right")
                        .addClass('opens-new-window')
                        .prop('href', lib.url)
                        .prop('target', '_blank')
                        .prop('rel', 'noopener noreferrer')
                        .append($('<sup></sup>')
                            .addClass('glyphicon glyphicon-new-window')
                        )
                    );
                }
                if (lib.description && lib.description.length > 0) {
                    libName
                        .addClass('lib-described')
                        .prop('title', lib.description);
                }
                var libCat = $('<li></li>')
                    .append(libHeader)
                    .addClass('lib-item');

                var libGroup = $('<div></div>');

                if (libsList.children().length > 0)
                    libsList.append($('<hr>').addClass('lib-separator'));

                _.each(lib.versions, function (version, vKey) {
                    var verCheckbox = $('<input type="checkbox">')
                        .addClass('lib-checkbox')
                        .prop('data-lib', libKey)
                        .prop('data-version', vKey)
                        .prop('checked', version.used)
                        .prop('name', libKey)
                        .on('change', {arrow: libArrow, group: libGroup}, onChecked);
                    libGroup
                        .append($('<div></div>')
                            .append(verCheckbox)
                            .append($('<label></label>')
                                .addClass('lib-label')
                                .text(version.version)
                                .on('click', function () {
                                    verCheckbox.trigger('click');
                                })
                            )
                        );
                });

                libGroup.hide();
                handleArrow(libGroup, libArrow);

                libHeader.on('click', function () {
                    libGroup.toggle();
                    handleArrow(libGroup, libArrow);
                });

                libGroup.appendTo(libCat);
                libCat.appendTo(libsList);
            });
            return $('<div></div>').addClass('libs-container').append(libLists);
        }, this),
        html: true,
        placement: 'bottom',
        trigger: 'manual'
    }).click(_.bind(function () {
        this.libsButton.popover('show');
    }, this)).on('show.bs.popover', function () {
        $(this).data('bs.popover').tip().css('max-width', '100%').css('width', 'auto');
    });
};

Compiler.prototype.onLanguageChange = function (editorId, newLangId) {
    if (this.sourceEditorId === editorId) {
        var oldLangId = this.currentLangId;
        this.currentLangId = newLangId;
        // Store the current selected stuff to come back to it later in the same session (Not state stored!)
        this.infoByLang[oldLangId] = {
            compiler: this.compiler && this.compiler.id ? this.compiler.id : options.defaultCompiler[oldLangId],
            options: this.options
        };
        this.updateLibsDropdown();
        this.updateCompilersSelector();
        this.updateCompilerUI();
        this.sendCompiler();
        this.saveState();
    }
};

Compiler.prototype.getCurrentLangCompilers = function () {
    return this.compilerService.getCompilersForLang(this.currentLangId);
};

Compiler.prototype.updateCompilersSelector = function () {
    this.compilerSelecrizer.clearOptions(true);
    this.compilerSelecrizer.clearOptionGroups();
    _.each(this.getGroupsInUse(), function (group) {
        this.compilerSelecrizer.addOptionGroup(group.value, {label: group.label});
    }, this);
    this.compilerSelecrizer.load(_.bind(function (callback) {
        callback(_.map(this.getCurrentLangCompilers(), _.identity));
    }, this));
    var defaultOrFirst = _.bind(function () {
        // If the default is a valid compiler, return it
        var defaultCompiler = options.defaultCompiler[this.currentLangId];
        if (defaultCompiler) return defaultCompiler;
        // Else try to find the first one for this language
        var value = _.find(options.compilers, _.bind(function (compiler) {
            return compiler.lang === this.currentLangId;
        }, this));

        // Return the first, or an empty string if none found (Should prob report this one...)
        return value && value.id ? value.id : "";
    }, this);
    var info = this.infoByLang[this.currentLangId] || {};
    this.compiler = this.findCompiler(this.currentLangId, info.compiler || defaultOrFirst());
    this.compilerSelecrizer.setValue([this.compiler ? this.compiler.id : null], true);
    this.options = info.options || "";
    this.optionsField.val(this.options);
};

Compiler.prototype.findCompiler = function (langId, compilerId) {
    return this.compilerService.findCompiler(langId, compilerId);
};

Compiler.prototype.langOfCompiler = function (compilerId) {
    var compiler = _.find(options.compilers, function (compiler) {
        return compiler.id === compilerId || compiler.alias === compilerId;
    });
    if (!compiler) {
        Raven.captureMessage('Unable to find compiler id "' + compilerId + '"');
        compiler = options.compilers[0];
    }
    return compiler.lang;
};

module.exports = {
    Compiler: Compiler
};