Zmiana nazwy project -> platforma.

[redakcja.git] / platforma / static / js / lib / codemirror / stringstream.js

diff --git a/platforma/static/js/lib/codemirror/stringstream.js b/platforma/static/js/lib/codemirror/stringstream.js
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+/* String streams are the things fed to parsers (which can feed them
+ * to a tokenizer if they want). They provide peek and next methods
+ * for looking at the current character (next 'consumes' this
+ * character, peek does not), and a get method for retrieving all the
+ * text that was consumed since the last time get was called.
+ *
+ * An easy mistake to make is to let a StopIteration exception finish
+ * the token stream while there are still characters pending in the
+ * string stream (hitting the end of the buffer while parsing a
+ * token). To make it easier to detect such errors, the stringstreams
+ * throw an exception when this happens.
+ */
+
+// Make a stringstream stream out of an iterator that returns strings.
+// This is applied to the result of traverseDOM (see codemirror.js),
+// and the resulting stream is fed to the parser.
+window.stringStream = function(source){
+  // String that's currently being iterated over.
+  var current = "";
+  // Position in that string.
+  var pos = 0;
+  // Accumulator for strings that have been iterated over but not
+  // get()-ed yet.
+  var accum = "";
+  // Make sure there are more characters ready, or throw
+  // StopIteration.
+  function ensureChars() {
+    while (pos == current.length) {
+      accum += current;
+      current = ""; // In case source.next() throws
+      pos = 0;
+      try {current = source.next();}
+      catch (e) {
+        if (e != StopIteration) throw e;
+        else return false;
+      }
+    }
+    return true;
+  }
+
+  return {
+    // Return the next character in the stream.
+    peek: function() {
+      if (!ensureChars()) return null;
+      return current.charAt(pos);
+    },
+    // Get the next character, throw StopIteration if at end, check
+    // for unused content.
+    next: function() {
+      if (!ensureChars()) {
+        if (accum.length > 0)
+          throw "End of stringstream reached without emptying buffer ('" + accum + "').";
+        else
+          throw StopIteration;
+      }
+      return current.charAt(pos++);
+    },
+    // Return the characters iterated over since the last call to
+    // .get().
+    get: function() {
+      var temp = accum;
+      accum = "";
+      if (pos > 0){
+        temp += current.slice(0, pos);
+        current = current.slice(pos);
+        pos = 0;
+      }
+      return temp;
+    },
+    // Push a string back into the stream.
+    push: function(str) {
+      current = current.slice(0, pos) + str + current.slice(pos);
+    },
+    lookAhead: function(str, consume, skipSpaces, caseInsensitive) {
+      function cased(str) {return caseInsensitive ? str.toLowerCase() : str;}
+      str = cased(str);
+      var found = false;
+
+      var _accum = accum, _pos = pos;
+      if (skipSpaces) this.nextWhileMatches(/[\s\u00a0]/);
+
+      while (true) {
+        var end = pos + str.length, left = current.length - pos;
+        if (end <= current.length) {
+          found = str == cased(current.slice(pos, end));
+          pos = end;
+          break;
+        }
+        else if (str.slice(0, left) == cased(current.slice(pos))) {
+          accum += current; current = "";
+          try {current = source.next();}
+          catch (e) {break;}
+          pos = 0;
+          str = str.slice(left);
+        }
+        else {
+          break;
+        }
+      }
+
+      if (!(found && consume)) {
+        current = accum.slice(_accum.length) + current;
+        pos = _pos;
+        accum = _accum;
+      }
+
+      return found;
+    },
+
+    // Utils built on top of the above
+    more: function() {
+      return this.peek() !== null;
+    },
+    applies: function(test) {
+      var next = this.peek();
+      return (next !== null && test(next));
+    },
+    nextWhile: function(test) {
+      var next;
+      while ((next = this.peek()) !== null && test(next))
+        this.next();
+    },
+    matches: function(re) {
+      var next = this.peek();
+      return (next !== null && re.test(next));
+    },
+    nextWhileMatches: function(re) {
+      var next;
+      while ((next = this.peek()) !== null && re.test(next))
+        this.next();
+    },
+    equals: function(ch) {
+      return ch === this.peek();
+    },
+    endOfLine: function() {
+      var next = this.peek();
+      return next == null || next == "\n";
+    }
+  };
+};