v01

thirdparty/Pangolin/include/pangolin/utils/transform.h

@@ -0,0 +1,102 @@
+/* This file is part of the Pangolin Project.
+ * http://github.com/stevenlovegrove/Pangolin
+ *
+ * Copyright (c) 2014 Steven Lovegrove
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#pragma once
+
+#include <ostream>
+#include <functional>
+
+namespace pangolin
+{
+
+// Find the open brace preceeded by '$'
+inline const char* FirstOpenBrace(const char* str, char token = '$', char open = '{')
+{
+    bool symbol = false;
+
+    for(; *str != '\0'; ++str ) {
+        if( *str == token) {
+            symbol = true;
+        }else{
+            if( symbol ) {
+                if( *str == open ) {
+                    return str;
+                } else {
+                    symbol = false;
+                }
+            }
+        }
+    }
+    return 0;
+}
+
+// Find the first matching end brace. str includes open brace
+inline const char* MatchingEndBrace(const char* str, char open = '{', char close = '}')
+{
+    int b = 0;
+    for(; *str != '\0'; ++str ) {
+        if( *str == open ) {
+            ++b;
+        }else if( *str == close ) {
+            --b;
+            if( b == 0 ) {
+                return str;
+            }
+        }
+    }
+    return 0;
+}
+
+inline std::string Transform(const std::string& val, std::function<std::string(const std::string&)> dictionary, char token = '$', char open = '{', char close = '}')
+{
+    std::string expanded = val;
+
+    while(true)
+    {
+        const char* brace = FirstOpenBrace(expanded.c_str(), token, open);
+        if(brace)
+        {
+            const char* endbrace = MatchingEndBrace(brace);
+            if( endbrace )
+            {
+                std::ostringstream oss;
+                oss << std::string(expanded.c_str(), brace-1);
+
+                const std::string inexpand = Transform( std::string(brace+1,endbrace), dictionary, token, open, close );
+                oss << dictionary(inexpand);
+                oss << std::string(endbrace+1, expanded.c_str() + expanded.length() );
+                expanded = oss.str();
+                continue;
+            }
+        }
+        break;
+    }
+
+    return expanded;
+}
+
+}