General.Web/wwwroot/lib/codemirror-5.31.0/test/mode_test.js

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/**
 * Helper to test CodeMirror highlighting modes. It pretty prints output of the
 * highlighter and can check against expected styles.
 *
 * Mode tests are registered by calling test.mode(testName, mode,
 * tokens), where mode is a mode object as returned by
 * CodeMirror.getMode, and tokens is an array of lines that make up
 * the test.
 *
 * These lines are strings, in which styled stretches of code are
 * enclosed in brackets `[]`, and prefixed by their style. For
 * example, `[keyword if]`. Brackets in the code itself must be
 * duplicated to prevent them from being interpreted as token
 * boundaries. For example `a[[i]]` for `a[i]`. If a token has
 * multiple styles, the styles must be separated by ampersands, for
 * example `[tag&error </hmtl>]`.
 *
 * See the test.js files in the css, markdown, gfm, and stex mode
 * directories for examples.
 */
(function() {
  function findSingle(str, pos, ch) {
    for (;;) {
      var found = str.indexOf(ch, pos);
      if (found == -1) return null;
      if (str.charAt(found + 1) != ch) return found;
      pos = found + 2;
    }
  }

  var styleName = /[\w&-_]+/g;
  function parseTokens(strs) {
    var tokens = [], plain = "";
    for (var i = 0; i < strs.length; ++i) {
      if (i) plain += "\n";
      var str = strs[i], pos = 0;
      while (pos < str.length) {
        var style = null, text;
        if (str.charAt(pos) == "[" && str.charAt(pos+1) != "[") {
          styleName.lastIndex = pos + 1;
          var m = styleName.exec(str);
          style = m[0].replace(/&/g, " ");
          var textStart = pos + style.length + 2;
          var end = findSingle(str, textStart, "]");
          if (end == null) throw new Error("Unterminated token at " + pos + " in '" + str + "'" + style);
          text = str.slice(textStart, end);
          pos = end + 1;
        } else {
          var end = findSingle(str, pos, "[");
          if (end == null) end = str.length;
          text = str.slice(pos, end);
          pos = end;
        }
        text = text.replace(/\[\[|\]\]/g, function(s) {return s.charAt(0);});
        tokens.push({style: style, text: text});
        plain += text;
      }
    }
    return {tokens: tokens, plain: plain};
  }