add float and int string conversion

README.md

@@ -193,6 +193,10 @@ render("{{ divisibleBy(42, 7) }}", data); // true
 render("{{ max([1, 2, 3]) }}", data); // 3
 render("{{ min([-2.4, -1.2, 4.5]) }}", data); // -2.4
 
+// Convert strings to numbers
+render("{{ int(\"2\") == 2 }}", data); // true
+render("{{ float(\"1.8\") > 2 }}", data); // false
+
 // Set default values if variables are not defined
 render("Hello {{ default(neighbour, \"my friend\") }}!", data); // "Hello Peter!"
 render("Hello {{ default(colleague, \"my friend\") }}!", data); // "Hello my friend!"

src/inja.hpp

@@ -265,6 +265,8 @@ struct Parsed {
 		DivisibleBy,
 		Even,
 		First,
+		Float,
+		Int,
 		Last,
 		Length,
 		Lower,
@@ -479,6 +481,12 @@ public:
 			case Parsed::Function::Different: {
 				return eval_expression(element.args[0], data) != eval_expression(element.args[1], data);
 			}
+			case Parsed::Function::Float: {
+				return std::stod(eval_expression<std::string>(element.args[0], data));
+			}
+			case Parsed::Function::Int: {
+				return std::stoi(eval_expression<std::string>(element.args[0], data));
+			}
 			case Parsed::Function::ReadJson: {
 				try {
 					return data.at(json::json_pointer(element.command));
@@ -655,6 +663,8 @@ public:
 		{Parsed::Function::DivisibleBy, function_regex("divisibleBy", 2)},
 		{Parsed::Function::Even, function_regex("even", 1)},
 		{Parsed::Function::First, function_regex("first", 1)},
+		{Parsed::Function::Float, function_regex("float", 1)},
+		{Parsed::Function::Int, function_regex("int", 1)},
 		{Parsed::Function::Last, function_regex("last", 1)},
 		{Parsed::Function::Length, function_regex("length", 1)},
 		{Parsed::Function::Lower, function_regex("lower", 1)},

test/src/unit-renderer.cpp

@@ -164,6 +164,18 @@ TEST_CASE("functions") {
 		// CHECK_THROWS_WITH( env.render("{{ min(name) }}", data), "[inja.exception.json_error] [json.exception.type_error.302] type must be array, but is string" );
 	}
 
+	SECTION("float") {
+		CHECK( env.render("{{ float(\"2.2\") == 2.2 }}", data) == "true" );
+		CHECK( env.render("{{ float(\"-1.25\") == -1.25 }}", data) == "true" );
+		// CHECK_THROWS_WITH( env.render("{{ max(name) }}", data), "[inja.exception.json_error] [json.exception.type_error.302] type must be array, but is string" );
+	}
+
+	SECTION("int") {
+		CHECK( env.render("{{ int(\"2\") == 2 }}", data) == "true" );
+		CHECK( env.render("{{ int(\"-1.25\") == -1 }}", data) == "true" );
+		// CHECK_THROWS_WITH( env.render("{{ max(name) }}", data), "[inja.exception.json_error] [json.exception.type_error.302] type must be array, but is string" );
+	}
+
 	SECTION("default") {
 		CHECK( env.render("{{ default(11, 0) }}", data) == "11" );
 		CHECK( env.render("{{ default(nothing, 0) }}", data) == "0" );