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diff --git a/libs/cassowary/cassowary/ClReader.h b/libs/cassowary/cassowary/ClReader.h
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+++ b/libs/cassowary/cassowary/ClReader.h
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+// $Id$
+//
+// Cassowary Incremental Constraint Solver
+// Original Smalltalk Implementation by Alan Borning
+// This C++ Implementation by Greg J. Badros, <gjb@cs.washington.edu>
+// http://www.cs.washington.edu/homes/gjb
+// (C) 1998, 1999 Greg J. Badros and Alan Borning
+// See ../LICENSE for legal details regarding this software
+//
+// ClReader.h
+// Original implementation contributed by Steve Wolfman
+// Subsequently largely revised by Greg J. Badros
+
+#ifndef CREADER_H
+#define CREADER_H
+
+#if defined(HAVE_CONFIG_H) && !defined(CONFIG_H_INCLUDED) && !defined(CONFIG_INLINE_H_INCLUDED)
+#include <cassowary/config-inline.h>
+#define CONFIG_INLINE_H_INCLUDED
+#endif
+
+#include <string>
+#include <map>
+#include <algorithm>
+#include <iostream>
+#include "ClErrors.h"
+#include "ClVariable.h"
+#include "ClStrength.h"
+#include "ClLinearExpression_fwd.h"
+
+using std::string;
+using std::istream;
+
+class ClConstraint;
+
+class ClVarLookupFunction : public std::unary_function<const string &,ClVariable *> {
+public:
+  virtual ClVariable *operator()(const string &) const { return &clvNil; }
+};
+
+
+// Attempts to read a constraint of input stream in
+// Returns constraint (freshly allocated, client responsibility to deallocate)
+// if succesful. Otherwise, returns 0.
+ClConstraint *PcnParseConstraint(istream &xi, const ClVarLookupFunction &lookup_func,
+                                 const ClStrength &strength = ClsRequired());
+
+class ClVarLookupInMap : public ClVarLookupFunction {
+public:
+  ClVarLookupInMap(StringToVarMap *pmapVars, bool fAutoCreate) 
+      : _pmapVars(pmapVars), _fAutoCreate(fAutoCreate) { }
+
+  ClVariable *operator()(const string &str) const
+    { 
+      if (!_pmapVars)
+        return &clvNil;
+      StringToVarMap &_mapVars = *_pmapVars;
+      StringToVarMap::iterator it = _mapVars.find(str);
+      if (it != _mapVars.end()) {
+        return &it->second;
+      } else if (_fAutoCreate) {
+        // save the old symbol table, if any
+        StringToVarMap *pmapOld = ClVariable::VarMap();
+	// and set it to this one temporarily
+        ClVariable::SetVarMap(&_mapVars);
+	ClVariable *pclv = new ClVariable(str);
+        // now switch it back
+        ClVariable::SetVarMap(pmapOld);
+        return pclv;
+      } else {
+        return &clvNil;
+      }
+    }
+private:
+  StringToVarMap *_pmapVars;
+  bool _fAutoCreate;
+};
+
+
+/* the "yyerror" function */
+void clerror(const char *sz);
+
+struct ClParseData {
+  ClParseData(istream &xi, const ClVarLookupFunction &lookup_func)
+      : _xi(xi), _lookup_func(lookup_func) { }
+
+  ClConstraint *Pcn() { return _pcn; }
+
+  ClVarSet _readOnlyVarsSoFar;
+      
+  istream & _xi;
+  ClConstraint * _pcn;
+  const ClVarLookupFunction &_lookup_func;
+};
+
+
+inline 
+const ClStrength
+&ClsFromSz(const char *sz)
+{
+  const ClStrength *pcls = &ClsRequired();
+  double n1, n2, n3;
+  if (strcmp("required",sz) == 0)
+    ; /* initialized to ClsRequired, above */
+  else if (strcasecmp("strong",sz) == 0) { pcls = &ClsStrong(); }
+  else if (strcasecmp("medium",sz) == 0) { pcls = &ClsMedium(); }
+  else if (strcasecmp("weak",sz) == 0) { pcls = &ClsWeak(); }
+  else if (sscanf(sz,"(%lf,%lf,%lf)",&n1,&n2,&n3) == 3) {
+    pcls = new ClStrength("parsed",n1,n2,n3);
+  } else {
+    throw ExCLParseErrorMisc("Error parsing strength");
+  }
+  return *pcls;
+}
+
+
+#endif