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Editing: tern.js

// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

// Glue code between CodeMirror and Tern.
//
// Create a CodeMirror.TernServer to wrap an actual Tern server,
// register open documents (CodeMirror.Doc instances) with it, and
// call its methods to activate the assisting functions that Tern
// provides.
//
// Options supported (all optional):
// * defs: An array of JSON definition data structures.
// * plugins: An object mapping plugin names to configuration
//   options.
// * getFile: A function(name, c) that can be used to access files in
//   the project that haven't been loaded yet. Simply do c(null) to
//   indicate that a file is not available.
// * fileFilter: A function(value, docName, doc) that will be applied
//   to documents before passing them on to Tern.
// * switchToDoc: A function(name, doc) that should, when providing a
//   multi-file view, switch the view or focus to the named file.
// * showError: A function(editor, message) that can be used to
//   override the way errors are displayed.
// * completionTip: Customize the content in tooltips for completions.
//   Is passed a single argument—the completion's data as returned by
//   Tern—and may return a string, DOM node, or null to indicate that
//   no tip should be shown. By default the docstring is shown.
// * typeTip: Like completionTip, but for the tooltips shown for type
//   queries.
// * responseFilter: A function(doc, query, request, error, data) that
//   will be applied to the Tern responses before treating them
//
//
// It is possible to run the Tern server in a web worker by specifying
// these additional options:
// * useWorker: Set to true to enable web worker mode. You'll probably
//   want to feature detect the actual value you use here, for example
//   !!window.Worker.
// * workerScript: The main script of the worker. Point this to
//   wherever you are hosting worker.js from this directory.
// * workerDeps: An array of paths pointing (relative to workerScript)
//   to the Acorn and Tern libraries and any Tern plugins you want to
//   load. Or, if you minified those into a single script and included
//   them in the workerScript, simply leave this undefined.

(function(mod) {
  if (typeof exports == "object" && typeof module == "object") // CommonJS
    mod(require("../../lib/codemirror"));
  else if (typeof define == "function" && define.amd) // AMD
    define(["../../lib/codemirror"], mod);
  else // Plain browser env
    mod(CodeMirror);
})(function(CodeMirror) {
  "use strict";
  // declare global: tern

CodeMirror.TernServer = function(options) {
    var self = this;
    this.options = options || {};
    var plugins = this.options.plugins || (this.options.plugins = {});
    if (!plugins.doc_comment) plugins.doc_comment = true;
    this.docs = Object.create(null);
    if (this.options.useWorker) {
      this.server = new WorkerServer(this);
    } else {
      this.server = new tern.Server({
        getFile: function(name, c) { return getFile(self, name, c); },
        async: true,
        defs: this.options.defs || [],
        plugins: plugins
      });
    }
    this.trackChange = function(doc, change) { trackChange(self, doc, change); };

this.cachedArgHints = null;
    this.activeArgHints = null;
    this.jumpStack = [];

this.getHint = function(cm, c) { return hint(self, cm, c); };
    this.getHint.async = true;
  };

CodeMirror.TernServer.prototype = {
    addDoc: function(name, doc) {
      var data = {doc: doc, name: name, changed: null};
      this.server.addFile(name, docValue(this, data));
      CodeMirror.on(doc, "change", this.trackChange);
      return this.docs[name] = data;
    },

delDoc: function(id) {
      var found = resolveDoc(this, id);
      if (!found) return;
      CodeMirror.off(found.doc, "change", this.trackChange);
      delete this.docs[found.name];
      this.server.delFile(found.name);
    },

hideDoc: function(id) {
      closeArgHints(this);
      var found = resolveDoc(this, id);
      if (found && found.changed) sendDoc(this, found);
    },

complete: function(cm) {
      cm.showHint({hint: this.getHint});
    },

showType: function(cm, pos, c) { showContextInfo(this, cm, pos, "type", c); },

showDocs: function(cm, pos, c) { showContextInfo(this, cm, pos, "documentation", c); },

updateArgHints: function(cm) { updateArgHints(this, cm); },

jumpToDef: function(cm) { jumpToDef(this, cm); },

jumpBack: function(cm) { jumpBack(this, cm); },

rename: function(cm) { rename(this, cm); },

selectName: function(cm) { selectName(this, cm); },

request: function (cm, query, c, pos) {
      var self = this;
      var doc = findDoc(this, cm.getDoc());
      var request = buildRequest(this, doc, query, pos);
      var extraOptions = request.query && this.options.queryOptions && this.options.queryOptions[request.query.type]
      if (extraOptions) for (var prop in extraOptions) request.query[prop] = extraOptions[prop];

this.server.request(request, function (error, data) {
        if (!error && self.options.responseFilter)
          data = self.options.responseFilter(doc, query, request, error, data);
        c(error, data);
      });
    },

destroy: function () {
      closeArgHints(this)
      if (this.worker) {
        this.worker.terminate();
        this.worker = null;
      }
    }
  };

var Pos = CodeMirror.Pos;
  var cls = "CodeMirror-Tern-";
  var bigDoc = 250;

function getFile(ts, name, c) {
    var buf = ts.docs[name];
    if (buf)
      c(docValue(ts, buf));
    else if (ts.options.getFile)
      ts.options.getFile(name, c);
    else
      c(null);
  }

function resolveDoc(ts, id) {
    if (typeof id == "string") return ts.docs[id];
    if (id instanceof CodeMirror) id = id.getDoc();
    if (id instanceof CodeMirror.Doc) return findDoc(ts, id);
  }

function trackChange(ts, doc, change) {
    var data = findDoc(ts, doc);

var argHints = ts.cachedArgHints;
    if (argHints && argHints.doc == doc && cmpPos(argHints.start, change.to) >= 0)
      ts.cachedArgHints = null;

var changed = data.changed;
    if (changed == null)
      data.changed = changed = {from: change.from.line, to: change.from.line};
    var end = change.from.line + (change.text.length - 1);
    if (change.from.line < changed.to) changed.to = changed.to - (change.to.line - end);
    if (end >= changed.to) changed.to = end + 1;
    if (changed.from > change.from.line) changed.from = change.from.line;

if (doc.lineCount() > bigDoc && change.to - changed.from > 100) setTimeout(function() {
      if (data.changed && data.changed.to - data.changed.from > 100) sendDoc(ts, data);
    }, 200);
  }

// Completion

function hint(ts, cm, c) {
    ts.request(cm, {type: "completions", types: true, docs: true, urls: true}, function(error, data) {
      if (error) return showError(ts, cm, error);
      var completions = [], after = "";
      var from = data.start, to = data.end;
      if (cm.getRange(Pos(from.line, from.ch - 2), from) == "[\"" &&
          cm.getRange(to, Pos(to.line, to.ch + 2)) != "\"]")
        after = "\"]";

for (var i = 0; i < data.completions.length; ++i) {
        var completion = data.completions[i], className = typeToIcon(completion.type);
        if (data.guess) className += " " + cls + "guess";
        completions.push({text: completion.name + after,
                          displayText: completion.displayName || completion.name,
                          className: className,
                          data: completion});
      }

function typeToIcon(type) {
    var suffix;
    if (type == "?") suffix = "unknown";
    else if (type == "number" || type == "string" || type == "bool") suffix = type;
    else if (/^fn\(/.test(type)) suffix = "fn";
    else if (/^\[/.test(type)) suffix = "array";
    else suffix = "object";
    return cls + "completion " + cls + "completion-" + suffix;
  }

// Type queries

// Maintaining argument hints

function updateArgHints(ts, cm) {
    closeArgHints(ts);

if (cm.somethingSelected()) return;
    var state = cm.getTokenAt(cm.getCursor()).state;
    var inner = CodeMirror.innerMode(cm.getMode(), state);
    if (inner.mode.name != "javascript") return;
    var lex = inner.state.lexical;
    if (lex.info != "call") return;

var ch, argPos = lex.pos || 0, tabSize = cm.getOption("tabSize");
    for (var line = cm.getCursor().line, e = Math.max(0, line - 9), found = false; line >= e; --line) {
      var str = cm.getLine(line), extra = 0;
      for (var pos = 0;;) {
        var tab = str.indexOf("\t", pos);
        if (tab == -1) break;
        extra += tabSize - (tab + extra) % tabSize - 1;
        pos = tab + 1;
      }
      ch = lex.column - extra;
      if (str.charAt(ch) == "(") {found = true; break;}
    }
    if (!found) return;

var start = Pos(line, ch);
    var cache = ts.cachedArgHints;
    if (cache && cache.doc == cm.getDoc() && cmpPos(start, cache.start) == 0)
      return showArgHints(ts, cm, argPos);

ts.request(cm, {type: "type", preferFunction: true, end: start}, function(error, data) {
      if (error || !data.type || !(/^fn\(/).test(data.type)) return;
      ts.cachedArgHints = {
        start: start,
        type: parseFnType(data.type),
        name: data.exprName || data.name || "fn",
        guess: data.guess,
        doc: cm.getDoc()
      };
      showArgHints(ts, cm, argPos);
    });
  }

function showArgHints(ts, cm, pos) {
    closeArgHints(ts);

function parseFnType(text) {
    var args = [], pos = 3;

// Parse arguments
    if (text.charAt(pos) != ")") for (;;) {
      var name = text.slice(pos).match(/^([^, $\[\{]+): /);
      if (name) {
        pos += name[0].length;
        name = name[1];
      }
      args.push({name: name, type: skipMatching(/[$,]/)});
      if (text.charAt(pos) == ")") break;
      pos += 2;
    }

var rettype = text.slice(pos).match(/^\) -> (.*)$/);

return {args: args, rettype: rettype && rettype[1]};
  }

// Moving to the definition of something

function jumpToDef(ts, cm) {
    function inner(varName) {
      var req = {type: "definition", variable: varName || null};
      var doc = findDoc(ts, cm.getDoc());
      ts.server.request(buildRequest(ts, doc, req), function(error, data) {
        if (error) return showError(ts, cm, error);
        if (!data.file && data.url) { window.open(data.url); return; }

if (data.file) {
          var localDoc = ts.docs[data.file], found;
          if (localDoc && (found = findContext(localDoc.doc, data))) {
            ts.jumpStack.push({file: doc.name,
                               start: cm.getCursor("from"),
                               end: cm.getCursor("to")});
            moveTo(ts, doc, localDoc, found.start, found.end);
            return;
          }
        }
        showError(ts, cm, "Could not find a definition.");
      });
    }

if (!atInterestingExpression(cm))
      dialog(cm, "Jump to variable", function(name) { if (name) inner(name); });
    else
      inner();
  }

function jumpBack(ts, cm) {
    var pos = ts.jumpStack.pop(), doc = pos && ts.docs[pos.file];
    if (!doc) return;
    moveTo(ts, findDoc(ts, cm.getDoc()), doc, pos.start, pos.end);
  }

function moveTo(ts, curDoc, doc, start, end) {
    doc.doc.setSelection(start, end);
    if (curDoc != doc && ts.options.switchToDoc) {
      closeArgHints(ts);
      ts.options.switchToDoc(doc.name, doc.doc);
    }
  }

// The {line,ch} representation of positions makes this rather awkward.
  function findContext(doc, data) {
    var before = data.context.slice(0, data.contextOffset).split("\n");
    var startLine = data.start.line - (before.length - 1);
    var start = Pos(startLine, (before.length == 1 ? data.start.ch : doc.getLine(startLine).length) - before[0].length);

var text = doc.getLine(startLine).slice(start.ch);
    for (var cur = startLine + 1; cur < doc.lineCount() && text.length < data.context.length; ++cur)
      text += "\n" + doc.getLine(cur);
    if (text.slice(0, data.context.length) == data.context) return data;

var cursor = doc.getSearchCursor(data.context, 0, false);
    var nearest, nearestDist = Infinity;
    while (cursor.findNext()) {
      var from = cursor.from(), dist = Math.abs(from.line - start.line) * 10000;
      if (!dist) dist = Math.abs(from.ch - start.ch);
      if (dist < nearestDist) { nearest = from; nearestDist = dist; }
    }
    if (!nearest) return null;

if (before.length == 1)
      nearest.ch += before[0].length;
    else
      nearest = Pos(nearest.line + (before.length - 1), before[before.length - 1].length);
    if (data.start.line == data.end.line)
      var end = Pos(nearest.line, nearest.ch + (data.end.ch - data.start.ch));
    else
      var end = Pos(nearest.line + (data.end.line - data.start.line), data.end.ch);
    return {start: nearest, end: end};
  }

function atInterestingExpression(cm) {
    var pos = cm.getCursor("end"), tok = cm.getTokenAt(pos);
    if (tok.start < pos.ch && tok.type == "comment") return false;
    return /[\w)\]]/.test(cm.getLine(pos.line).slice(Math.max(pos.ch - 1, 0), pos.ch + 1));
  }

// Variable renaming

// Generic request-building helper

function buildRequest(ts, doc, query, pos) {
    var files = [], offsetLines = 0, allowFragments = !query.fullDocs;
    if (!allowFragments) delete query.fullDocs;
    if (typeof query == "string") query = {type: query};
    query.lineCharPositions = true;
    if (query.end == null) {
      query.end = pos || doc.doc.getCursor("end");
      if (doc.doc.somethingSelected())
        query.start = doc.doc.getCursor("start");
    }
    var startPos = query.start || query.end;

if (doc.changed) {
      if (doc.doc.lineCount() > bigDoc && allowFragments !== false &&
          doc.changed.to - doc.changed.from < 100 &&
          doc.changed.from <= startPos.line && doc.changed.to > query.end.line) {
        files.push(getFragmentAround(doc, startPos, query.end));
        query.file = "#0";
        var offsetLines = files[0].offsetLines;
        if (query.start != null) query.start = Pos(query.start.line - -offsetLines, query.start.ch);
        query.end = Pos(query.end.line - offsetLines, query.end.ch);
      } else {
        files.push({type: "full",
                    name: doc.name,
                    text: docValue(ts, doc)});
        query.file = doc.name;
        doc.changed = null;
      }
    } else {
      query.file = doc.name;
    }
    for (var name in ts.docs) {
      var cur = ts.docs[name];
      if (cur.changed && cur != doc) {
        files.push({type: "full", name: cur.name, text: docValue(ts, cur)});
        cur.changed = null;
      }
    }

return {query: query, files: files};
  }

function getFragmentAround(data, start, end) {
    var doc = data.doc;
    var minIndent = null, minLine = null, endLine, tabSize = 4;
    for (var p = start.line - 1, min = Math.max(0, p - 50); p >= min; --p) {
      var line = doc.getLine(p), fn = line.search(/\bfunction\b/);
      if (fn < 0) continue;
      var indent = CodeMirror.countColumn(line, null, tabSize);
      if (minIndent != null && minIndent <= indent) continue;
      minIndent = indent;
      minLine = p;
    }
    if (minLine == null) minLine = min;
    var max = Math.min(doc.lastLine(), end.line + 20);
    if (minIndent == null || minIndent == CodeMirror.countColumn(doc.getLine(start.line), null, tabSize))
      endLine = max;
    else for (endLine = end.line + 1; endLine < max; ++endLine) {
      var indent = CodeMirror.countColumn(doc.getLine(endLine), null, tabSize);
      if (indent <= minIndent) break;
    }
    var from = Pos(minLine, 0);

return {type: "part",
            name: data.name,
            offsetLines: from.line,
            text: doc.getRange(from, Pos(endLine, end.line == endLine ? null : 0))};
  }

// Generic utilities

var cmpPos = CodeMirror.cmpPos;

function elt(tagname, cls /*, ... elts*/) {
    var e = document.createElement(tagname);
    if (cls) e.className = cls;
    for (var i = 2; i < arguments.length; ++i) {
      var elt = arguments[i];
      if (typeof elt == "string") elt = document.createTextNode(elt);
      e.appendChild(elt);
    }
    return e;
  }

function dialog(cm, text, f) {
    if (cm.openDialog)
      cm.openDialog(text + ": <input type=text>", f);
    else
      f(prompt(text, ""));
  }

// Tooltips

function onEditorActivity(cm, f) {
    cm.on("cursorActivity", f)
    cm.on("blur", f)
    cm.on("scroll", f)
    cm.on("setDoc", f)
    return function() {
      cm.off("cursorActivity", f)
      cm.off("blur", f)
      cm.off("scroll", f)
      cm.off("setDoc", f)
    }
  }

function makeTooltip(x, y, content, cm, className) {
    var node = elt("div", cls + "tooltip" + " " + (className || ""), content);
    node.style.left = x + "px";
    node.style.top = y + "px";
    var container = ((cm.options || {}).hintOptions || {}).container || document.body;
    container.appendChild(node);

var pos = cm.cursorCoords();
    var winW = window.innerWidth;
    var winH = window.innerHeight;
    var box = node.getBoundingClientRect();
    var hints = document.querySelector(".CodeMirror-hints");
    var overlapY = box.bottom - winH;
    var overlapX = box.right - winW;

if (hints && overlapX > 0) {
      node.style.left = 0;
      var box = node.getBoundingClientRect();
      node.style.left = (x = x - hints.offsetWidth - box.width) + "px";
      overlapX = box.right - winW;
    }
    if (overlapY > 0) {
      var height = box.bottom - box.top, curTop = pos.top - (pos.bottom - box.top);
      if (curTop - height > 0) { // Fits above cursor
        node.style.top = (pos.top - height) + "px";
      } else if (height > winH) {
        node.style.height = (winH - 5) + "px";
        node.style.top = (pos.bottom - box.top) + "px";
      }
    }
    if (overlapX > 0) {
      if (box.right - box.left > winW) {
        node.style.width = (winW - 5) + "px";
        overlapX -= (box.right - box.left) - winW;
      }
      node.style.left = (x - overlapX) + "px";
    }

return node;
  }

function remove(node) {
    var p = node && node.parentNode;
    if (p) p.removeChild(node);
  }

function fadeOut(tooltip) {
    tooltip.style.opacity = "0";
    setTimeout(function() { remove(tooltip); }, 1100);
  }

function showError(ts, cm, msg) {
    if (ts.options.showError)
      ts.options.showError(cm, msg);
    else
      tempTooltip(cm, String(msg), ts);
  }

function closeArgHints(ts) {
    if (ts.activeArgHints) {
      if (ts.activeArgHints.clear) ts.activeArgHints.clear()
      remove(ts.activeArgHints)
      ts.activeArgHints = null
    }
  }

function docValue(ts, doc) {
    var val = doc.doc.getValue();
    if (ts.options.fileFilter) val = ts.options.fileFilter(val, doc.name, doc.doc);
    return val;
  }

// Worker wrapper

function WorkerServer(ts) {
    var worker = ts.worker = new Worker(ts.options.workerScript);
    worker.postMessage({type: "init",
                        defs: ts.options.defs,
                        plugins: ts.options.plugins,
                        scripts: ts.options.workerDeps});
    var msgId = 0, pending = {};

this.addFile = function(name, text) { send({type: "add", name: name, text: text}); };
    this.delFile = function(name) { send({type: "del", name: name}); };
    this.request = function(body, c) { send({type: "req", body: body}, c); };
  }
});

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