first commit

codemirror/lib/util/foldcode.js

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+// the tagRangeFinder function is
+//   Copyright (C) 2011 by Daniel Glazman <daniel@glazman.org>
+// released under the MIT license (../../LICENSE) like the rest of CodeMirror
+CodeMirror.tagRangeFinder = function(cm, start) {
+  var nameStartChar = "A-Z_a-z\\u00C0-\\u00D6\\u00D8-\\u00F6\\u00F8-\\u02FF\\u0370-\\u037D\\u037F-\\u1FFF\\u200C-\\u200D\\u2070-\\u218F\\u2C00-\\u2FEF\\u3001-\\uD7FF\\uF900-\\uFDCF\\uFDF0-\\uFFFD";
+  var nameChar = nameStartChar + "\-\:\.0-9\\u00B7\\u0300-\\u036F\\u203F-\\u2040";
+  var xmlNAMERegExp = new RegExp("^[" + nameStartChar + "][" + nameChar + "]*");
+
+  var lineText = cm.getLine(start.line);
+  var found = false;
+  var tag = null;
+  var pos = start.ch;
+  while (!found) {
+    pos = lineText.indexOf("<", pos);
+    if (-1 == pos) // no tag on line
+      return;
+    if (pos + 1 < lineText.length && lineText[pos + 1] == "/") { // closing tag
+      pos++;
+      continue;
+    }
+    // ok we seem to have a start tag
+    if (!lineText.substr(pos + 1).match(xmlNAMERegExp)) { // not a tag name...
+      pos++;
+      continue;
+    }
+    var gtPos = lineText.indexOf(">", pos + 1);
+    if (-1 == gtPos) { // end of start tag not in line
+      var l = start.line + 1;
+      var foundGt = false;
+      var lastLine = cm.lineCount();
+      while (l < lastLine && !foundGt) {
+        var lt = cm.getLine(l);
+        gtPos = lt.indexOf(">");
+        if (-1 != gtPos) { // found a >
+          foundGt = true;
+          var slash = lt.lastIndexOf("/", gtPos);
+          if (-1 != slash && slash < gtPos) {
+            var str = lineText.substr(slash, gtPos - slash + 1);
+            if (!str.match( /\/\s*\>/ )) // yep, that's the end of empty tag
+              return;
+          }
+        }
+        l++;
+      }
+      found = true;
+    }
+    else {
+      var slashPos = lineText.lastIndexOf("/", gtPos);
+      if (-1 == slashPos) { // cannot be empty tag
+        found = true;
+        // don't continue
+      }
+      else { // empty tag?
+        // check if really empty tag
+        var str = lineText.substr(slashPos, gtPos - slashPos + 1);
+        if (!str.match( /\/\s*\>/ )) { // finally not empty
+          found = true;
+          // don't continue
+        }
+      }
+    }
+    if (found) {
+      var subLine = lineText.substr(pos + 1);
+      tag = subLine.match(xmlNAMERegExp);
+      if (tag) {
+        // we have an element name, wooohooo !
+        tag = tag[0];
+        // do we have the close tag on same line ???
+        if (-1 != lineText.indexOf("</" + tag + ">", pos)) // yep
+        {
+          found = false;
+        }
+        // we don't, so we have a candidate...
+      }
+      else
+        found = false;
+    }
+    if (!found)
+      pos++;
+  }
+
+  if (found) {
+    var startTag = "(\\<\\/" + tag + "\\>)|(\\<" + tag + "\\>)|(\\<" + tag + "\\s)|(\\<" + tag + "$)";
+    var startTagRegExp = new RegExp(startTag);
+    var endTag = "</" + tag + ">";
+    var depth = 1;
+    var l = start.line + 1;
+    var lastLine = cm.lineCount();
+    while (l < lastLine) {
+      lineText = cm.getLine(l);
+      var match = lineText.match(startTagRegExp);
+      if (match) {
+        for (var i = 0; i < match.length; i++) {
+          if (match[i] == endTag)
+            depth--;
+          else
+            depth++;
+          if (!depth) return {from: {line: start.line, ch: gtPos + 1},
+                              to: {line: l, ch: match.index}};
+        }
+      }
+      l++;
+    }
+    return;
+  }
+};
+
+CodeMirror.braceRangeFinder = function(cm, start) {
+  var line = start.line, lineText = cm.getLine(line);
+  var at = lineText.length, startChar, tokenType;
+  for (;;) {
+    var found = lineText.lastIndexOf("{", at);
+    if (found < start.ch) break;
+    tokenType = cm.getTokenAt({line: line, ch: found}).type;
+    if (!/^(comment|string)/.test(tokenType)) { startChar = found; break; }
+    at = found - 1;
+  }
+  if (startChar == null || lineText.lastIndexOf("}") > startChar) return;
+  var count = 1, lastLine = cm.lineCount(), end, endCh;
+  outer: for (var i = line + 1; i < lastLine; ++i) {
+    var text = cm.getLine(i), pos = 0;
+    for (;;) {
+      var nextOpen = text.indexOf("{", pos), nextClose = text.indexOf("}", pos);
+      if (nextOpen < 0) nextOpen = text.length;
+      if (nextClose < 0) nextClose = text.length;
+      pos = Math.min(nextOpen, nextClose);
+      if (pos == text.length) break;
+      if (cm.getTokenAt({line: i, ch: pos + 1}).type == tokenType) {
+        if (pos == nextOpen) ++count;
+        else if (!--count) { end = i; endCh = pos; break outer; }
+      }
+      ++pos;
+    }
+  }
+  if (end == null || end == line + 1) return;
+  return {from: {line: line, ch: startChar + 1},
+          to: {line: end, ch: endCh}};
+};
+
+CodeMirror.indentRangeFinder = function(cm, start) {
+  var tabSize = cm.getOption("tabSize"), firstLine = cm.getLine(start.line);
+  var myIndent = CodeMirror.countColumn(firstLine, null, tabSize);
+  for (var i = start.line + 1, end = cm.lineCount(); i < end; ++i) {
+    var curLine = cm.getLine(i);
+    if (CodeMirror.countColumn(curLine, null, tabSize) < myIndent)
+      return {from: {line: start.line, ch: firstLine.length},
+              to: {line: i, ch: curLine.length}};
+  }
+};
+
+CodeMirror.newFoldFunction = function(rangeFinder, widget) {
+  if (widget == null) widget = "\u2194";
+  if (typeof widget == "string") {
+    var text = document.createTextNode(widget);
+    widget = document.createElement("span");
+    widget.appendChild(text);
+    widget.className = "CodeMirror-foldmarker";
+  }
+
+  return function(cm, pos) {
+    if (typeof pos == "number") pos = {line: pos, ch: 0};
+    var range = rangeFinder(cm, pos);
+    if (!range) return;
+
+    var present = cm.findMarksAt(range.from), cleared = 0;
+    for (var i = 0; i < present.length; ++i) {
+      if (present[i].__isFold) {
+        ++cleared;
+        present[i].clear();
+      }
+    }
+    if (cleared) return;
+
+    var myWidget = widget.cloneNode(true);
+    CodeMirror.on(myWidget, "mousedown", function() {myRange.clear();});
+    var myRange = cm.markText(range.from, range.to, {
+      replacedWith: myWidget,
+      clearOnEnter: true,
+      __isFold: true
+    });
+  };
+};