Xtext，转换ascii字符到数学符号

Question

文本编辑器如何翻译(例如)->到latex符号rightarrow ?

Answer 1

看看自动编辑的好功能

public class MyDslDefaultAutoEditStrategyProvider extends DefaultAutoEditStrategyProvider {
    @Inject
    protected Provider<ShortCutEditStrategy> shortCut;
    @Override
    protected void configureStringLiteral(IEditStrategyAcceptor acceptor) {
        acceptor.accept(shortCut.get().configure("->", "\rightarrow"), IDocument.DEFAULT_CONTENT_TYPE);
    }
}

，不要忘记绑定

override Class<? extends AbstractEditStrategyProvider> bindAbstractEditStrategyProvider() {
    MyDslDefaultAutoEditStrategyProvider
}

Answer 2

使用JavaScript很容易。这个简单的脚本应该有帮助:

 replaceText('->', 'rightarrow');
var replaceText = function (search, replaceWith) {
    var area = document.getElementById("area");
  var getCount = function (str, search) {
      return str.split(search).length - 1;
  }; 
  if (area.value.indexOf(search) >= 0) {
          var start = area.selectionStart;
          var end = area.selectionEnd;
          var textBefore = area.value.substr(0, end);
          var lengthDiff = (replaceWith.length - search.length) * getCount(textBefore, search);
          area.value = area.value.replace(search, replaceWith);
          area.selectionStart = start + lengthDiff;
          area.selectionEnd = end + lengthDiff;
      }
  };

这篇全文可以很容易地适应你的使用-这里有一个完整的例子。

    <textarea id="area"></textarea>

<script>
function keyDownTextField() {
 replaceText('->', 'u2192');
}

var replaceText = function (search, replaceWith) {
var area = document.getElementById("area");
 var getCount = function (str, search) {
  return str.split(search).length - 1;
 }; 
  if (area.value.indexOf(search) >= 0) {
          var start = area.selectionStart;
          var end = area.selectionEnd;
          var textBefore = area.value.substr(0, end);
          var lengthDiff = (replaceWith.length - search.length) * getCount(textBefore, search);
          area.value = area.value.replace(search, replaceWith);
          area.selectionStart = start + lengthDiff;
          area.selectionEnd = end + lengthDiff;
      }
  };

  document.addEventListener("keydown", keyDownTextField, false);
 </script>