1 files changed, 71 insertions, 10 deletions

diff --git a/src/Ninja.cpp b/src/Ninja.cpp
index 7b3212e..f74ab04 100644
--- a/src/Ninja.cpp
+++ b/src/Ninja.cpp
@@ -10,15 +10,75 @@ namespace ninja
         {
             if(!result.empty())
                 result += ' ';
-            result += '\'';
-            if(arg.type == NinjaArg::Type::VARIABLE)
-                result += "$";
-            result += arg.arg;
-            result += '\'';
+
+            NinjaArg::Type argType = arg.type;
+            if(!arg.arg.empty() && arg.arg[0] == '$')
+                argType = NinjaArg::Type::RAW;
+            
+            switch(argType)
+            {
+                case NinjaArg::Type::VALUE:
+                {
+                    result += '\'' + arg.arg + '\'';
+                    break;
+                }
+                case NinjaArg::Type::VARIABLE:
+                {
+                    result += '$' + arg.arg;
+                    break;
+                }
+                case NinjaArg::Type::RAW:
+                {
+                    result += arg.arg;
+                    break;
+                }
+            }
         }
         return result;
     }
 
+    static bool isAlpha(char c)
+    {
+        return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
+    }
+
+    static bool isNum(char c)
+    {
+        return c >= '0' && c <= '9';
+    }
+
+    static bool isAlnum(char c)
+    {
+        return isAlpha(c) || isNum(c);
+    }
+
+    static bool isValidName(const std::string &name)
+    {
+        if(name.empty())
+            return false;
+
+        if(name.size() > 100)
+            return false;
+
+        if(!isAlpha(name[0]) && name[0] != '_')
+            return false;
+
+        for(int i = 1; i < name.size(); ++i)
+        {
+            if(!isAlnum(name[i]) && name[i] != '_')
+                return false;
+        }
+
+        return true;
+    }
+
+    NinjaVariable::NinjaVariable(const std::string &_name) : 
+        name(_name)
+    {
+        if(!isValidName(name))
+            throw NinjaException(NinjaError::INVALID_NAME, "Invalid variable name, has to match [a-zA-Z_]{1}[a-zA-Z0-9_]{0,98}");
+    }
+
     NinjaRule::NinjaRule(NinjaBuildFile *_buildFile, const std::string &_name, const std::string &_command) : 
         buildFile(_buildFile),
         name(_name),
@@ -42,6 +102,9 @@ namespace ninja
 
     void NinjaBuildFile::defineGlobalVariable(const std::string &name, const std::string &value)
     {
+        if(!isValidName(name))
+            throw NinjaException(NinjaError::INVALID_NAME, "Invalid global variable name, has to match [a-zA-Z_]{1}[a-zA-Z0-9_]{0,98}");
+
         auto it = globalVariables.find(name);
         if(it != globalVariables.end())
             throw NinjaException(NinjaError::VARIABLE_ALREADY_DEFINED, "Global variable already defined: " + name);
@@ -50,6 +113,9 @@ namespace ninja
 
     NinjaRule* NinjaBuildFile::createRule(const std::string &name, const std::vector<NinjaArg> &commandArgs)
     {
+        if(!isValidName(name))
+            throw NinjaException(NinjaError::INVALID_NAME, "Invalid rule name, has to match [a-zA-Z_]{1}[a-zA-Z0-9_]{0,98}");
+
         auto it = rules.find(name);
         if(it != rules.end())
             throw NinjaException(NinjaError::RULE_ALREADY_DEFINED, "Rule already defined: " + name);
@@ -61,11 +127,6 @@ namespace ninja
 
     void NinjaBuildFile::build(const NinjaRule *rule, const std::string &in, const std::string &out, const std::vector<ninja::NinjaArgValue> &additionalArgs)
     {
-        for(const NinjaBuild &build : builds)
-        {
-            if(build.rule == rule)
-                throw NinjaException(NinjaError::RULE_AREADY_BUILT, "Rule already built: " + rule->name);
-        }
         builds.push_back({ rule, in, out, additionalArgs });
     }