Misc. warning causes removed.

- more signed/unsigned
- unused variables
- suggest braces around assignment

document_parser.cpp

@@ -477,7 +477,7 @@ namespace Sass {
           block.has_statements = true;
         }
         else {
-          for (int i = 0; i < imported_tree.size(); ++i) {
+          for (size_t i = 0; i < imported_tree.size(); ++i) {
             if (imported_tree[i].type == Node::comment ||
                 imported_tree[i].type == Node::rule) {
               block[0].has_statements = true;
@@ -512,7 +512,7 @@ namespace Sass {
       //   block << parse_ruleset();
       //   block.has_blocks = true;
       // }
-      else if (const char* p = lookahead_for_selector(position)) {
+      else if (lookahead_for_selector(position)) {
         block << parse_ruleset(definition);
         block[0].has_blocks = true;
       }
@@ -852,7 +852,8 @@ namespace Sass {
     
     Node schema(Node::string_schema, context.registry, line_number, 1);
     while (i < str.end) {
-      if (p = find_first_in_interval< sequence< negate< exactly<'\\'> >, exactly<hash_lbrace> > >(i, str.end)) {
+      p = find_first_in_interval< sequence< negate< exactly<'\\'> >, exactly<hash_lbrace> > >(i, str.end);
+      if (p) {
         if (i < p) schema << Node(Node::identifier, line_number, Token::make(i, p)); // accumulate the preceding segment if it's nonempty
         const char* j = find_first_in_interval< exactly<rbrace> >(p, str.end); // find the closing brace
         if (j) {

eval_apply.cpp

@@ -400,7 +400,7 @@ namespace Sass {
       }
     }
     // plug the holes with default arguments if any
-    for (int i = 0; i < params.size(); ++i) {
+    for (size_t i = 0; i < params.size(); ++i) {
       if (params[i].type == Node::assignment) {
         Node param(params[i]);
         Token name(param[0].content.token);
@@ -411,7 +411,7 @@ namespace Sass {
     }
     // lexically link the new environment and eval the mixin's body
     bindings.link(env.global ? *env.global : env);
-    for (int i = 0; i < body.size(); ++i) {
+    for (size_t i = 0; i < body.size(); ++i) {
       body[i] = eval(body[i], bindings, f_env, registry);
     }
     return body;

node.cpp

@@ -60,11 +60,9 @@ namespace Sass {
         //   result += at(0).to_string(t == backref ? prefix : "");
         // }
         
-        Node::Type t = at(0).type;
         result += at(0).to_string(at(0).has_backref ? prefix : "");
 
         for (size_t i = 1; i < size(); ++i) {
-          Node::Type t = at(i).type;
           result += " ";
           result += at(i).to_string(at(i).has_backref ? prefix : "");
         }

prelexer.hpp

@@ -388,8 +388,8 @@ namespace Sass {
     template<prelexer mx>
     const char* find_first_in_interval(const char* beg, const char* end) {
       while ((beg < end) && *beg) {
-        const char* p;
-        if (p = mx(beg)) return p;
+        const char* p = mx(beg);
+        if (p) return p;
         ++beg;
       }
       return 0;