javascript - 如何跨多个代码镜像实例进行搜索？

Question

假设我有以下包含两个 CodeMirror 实例的简单页面:

const body = document.querySelector('body')

const title = document.createElement('h1')
title.textContent = 'This is a document with multiple CodeMirrors'
body.appendChild(title);

const area1 = document.createElement('textarea')
body.appendChild(area1)
const editor1 = CodeMirror.fromTextArea(area1, {
  lineNumbers: true,
})

const segway = document.createElement('h2')
segway.textContent = 'Moving on to another editor'
body.appendChild(segway)


const area2 = document.createElement('textarea')
body.appendChild(area2)
const editor2 = CodeMirror.fromTextArea(area2, {
  lineNumbers: true,
})

我已经包括在内了

• codemirror/addon/search/search
• codemirror/addon/search/searchcursor
• codemirror/addon/dialog/dialog

当聚焦于编辑器时，每个 CodeMirror 实例现在都有自己的搜索处理程序(通过 ctrl/cmd-f 触发)。我如何实现跨多个 CodeMirror 实例的搜索/替换？

至少有一种方法可以在每个编辑器上执行find:editor.execCommand。我没有看到传递给它或查询可用结果的方法。

CodePen with example code and imports

GitHub issue for project wanting to use this, nteract .

在CodeMirror issue Marijn 说“你必须自己编写代码。”，这很公平——我不确定如何处理这个问题。

Answer 1

find 和 replace 命令链接到 dialog 插件，似乎没有办法通过实例，至少不是通过对话传递的查询。

但是您可以恢复 search.js 中的大部分内容并将其添加为扩展，您可以向其传递查询。但是随后您需要设置一个全局对话框或一种获取不依赖于实例的查询的方法，并在每个实例上运行它。类似的东西应该可以工作，这仅用于搜索，但替换也应该很容易:

CodeMirror.defineExtension('search', function(query) {

  // This is all taken from search.js, pretty much as is for the first part.
  function SearchState() {
    this.posFrom = this.posTo = this.lastQuery = this.query = null;
    this.overlay = null;
  }

  function getSearchState(cm) {
    return cm.state.search || (cm.state.search = new SearchState());
  }

  function searchOverlay(query, caseInsensitive) {
    if (typeof query == "string")
      query = new RegExp(query.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&"), caseInsensitive ? "gi" : "g");
    else if (!query.global)
      query = new RegExp(query.source, query.ignoreCase ? "gi" : "g");

    return {
      token: function(stream) {
        query.lastIndex = stream.pos;
        var match = query.exec(stream.string);
        if (match && match.index == stream.pos) {
          stream.pos += match[0].length || 1;
          return "searching";
        } else if (match) {
          stream.pos = match.index;
        } else {
          stream.skipToEnd();
        }
      }
    };
  }

  function queryCaseInsensitive(query) {
    return typeof query == "string" && query == query.toLowerCase();
  }

  function parseString(string) {
    return string.replace(/\\(.)/g, function(_, ch) {
      if (ch == "n") return "\n"
      if (ch == "r") return "\r"
      return ch
    })
  }

  function parseQuery(query) {
    var isRE = query.match(/^\/(.*)\/([a-z]*)$/);
    if (isRE) {
      try {
        query = new RegExp(isRE[1], isRE[2].indexOf("i") == -1 ? "" : "i");
      } catch (e) {} // Not a regular expression after all, do a string search
    } else {
      query = parseString(query)
    }
    if (typeof query == "string" ? query == "" : query.test(""))
      query = /x^/;
    return query;
  }

  // From here it's still from search.js, but a bit tweaked so it applies
  // as an extension, these are basically clearSearch and startSearch.
  var state = getSearchState(this);
  state.lastQuery = state.query;
  state.query = state.queryText = null;
  this.removeOverlay(state.overlay);
  if (state.annotate) {
    state.annotate.clear();
    state.annotate = null;
  }

  state.queryText = query;
  state.query = parseQuery(query);
  this.removeOverlay(state.overlay, queryCaseInsensitive(state.query));
  state.overlay = searchOverlay(state.query, queryCaseInsensitive(state.query));

  this.addOverlay(state.overlay);
  if (this.showMatchesOnScrollbar) {
    if (state.annotate) {
      state.annotate.clear();
      state.annotate = null;
    }
    state.annotate = this.showMatchesOnScrollbar(state.query, queryCaseInsensitive(state.query));
  }
});

// this is to have an external input, but you could have your own way of
// providing your query. Important thing is that you can run search on
// an instance with a query.
const body = document.querySelector('body')
const searchAll = document.createElement('input');
body.appendChild(searchAll);
searchAll.placeholder = 'Search All';
searchAll.addEventListener('input', function(e) {
  var query = e.target.value;
  var codeMirrorInstances = document.getElementsByClassName('CodeMirror');
  for (var i = 0; i < codeMirrorInstances.length; i++) {
    var curInst = codeMirrorInstances[i].CodeMirror;
    curInst.search(query);
  }
});

const title = document.createElement('h1')
title.textContent = 'This is a document with multiple CodeMirrors'
body.appendChild(title);

const area1 = document.createElement('textarea')
body.appendChild(area1)
const editor1 = CodeMirror.fromTextArea(area1, {
  lineNumbers: true,
})

const segway = document.createElement('h2')
segway.textContent = 'Moving on to another editor'
body.appendChild(segway)

const area2 = document.createElement('textarea')
body.appendChild(area2)
const editor2 = CodeMirror.fromTextArea(area2, {
  lineNumbers: true,
});

http://codepen.io/anon/pen/yavrRk?editors=0010

编辑:

其他命令，如 findNext 将在应用查询后正常工作，但当然这也取决于实例。如果您需要在所有实例中实现 findNext，它会变得更加复杂，您需要管理不同的事情，例如当前聚焦的实例，并覆盖某些行为，例如 findNext 循环和像这样的东西。可以做到，但是根据您需要的精度级别，它可能非常复杂。像这样的东西可行，它不是很优雅，但展示了它是如何完成的:

CodeMirror.defineExtension('findNext', function(query) {
  function SearchState() {
    this.posFrom = this.posTo = this.lastQuery = this.query = null;
    this.overlay = null;
  }

  function getSearchState(cm) {
    return cm.state.search || (cm.state.search = new SearchState());
  }

  // You tweak findNext a bit so it doesn't loop and so that it returns
  // false when at the last occurence. You could make findPrevious as well
  var state = getSearchState(this);
  var cursor = this.getSearchCursor(state.query, state.posTo, state.query.toLowerCase());
  if (!cursor.find(false)) {
    state.posTo = CodeMirror.Pos(0, 0);
    this.setSelection(CodeMirror.Pos(0, 0));
    return false;

  } else {
    this.setSelection(cursor.from(), cursor.to());
    this.scrollIntoView({
      from: cursor.from(),
      to: cursor.to()
    }, 20);
    state.posFrom = cursor.from();
    state.posTo = cursor.to();
    return true;
  }
});

// You make a find next button that will handle all instances
const findNextBtn = document.createElement('button');
body.appendChild(findNextBtn);
findNextBtn.textContent = 'Find next';
findNextBtn.addEventListener('click', function(e) {
    // Here you need to keep track of where you want to start the search
    // and iterating through all instances. 
    var curFocusIndex = -1;
    var codeMirrorInstances = Array.prototype.slice.call(document.getElementsByClassName('CodeMirror'));
    var focusedIndex = codeMirrorInstances.indexOf(lastFocused.getWrapperElement());

    // with the new return in findNext you can control when you go to
    // next instance
    var findInCurCm = lastFocused.findNext();
    while (!findInCurCm && curFocusIndex !== focusedIndex) {
      curFocusIndex = codeMirrorInstances.indexOf(lastFocused.getWrapperElement()) + 1;
      curFocusIndex = curFocusIndex === codeMirrorInstances.length ? 0 : curFocusIndex;
      codeMirrorInstances[curFocusIndex].CodeMirror.focus();
      lastFocused = codeMirrorInstances[curFocusIndex].CodeMirror;    
      var findInCurCm = lastFocused.findNext();    
    }
  });

http://codepen.io/anon/pen/ORvJpK?editors=0010