Added min and max script pseudo-functions

src/script/context.cpp

@@ -275,6 +275,15 @@ void instrUnary  (UnaryInstructionType   i, ScriptValueP& a) {
 	}															\
 	break
 
+// operator on doubles or ints, defined as a function
+#define OPERATOR_FUN_DI(OP)										\
+	if (at == SCRIPT_DOUBLE || bt == SCRIPT_DOUBLE) {			\
+		a = to_script(OP((double)*a,  (double)*b));				\
+	} else {													\
+		a = to_script(OP((int)*a,     (int)*b));				\
+	}															\
+	break
+
 // operator on strings or doubles or ints, when in doubt, uses strings
 #define OPERATOR_SDI(OP)										\
 	if (at == SCRIPT_INT && bt == SCRIPT_INT) {					\
@@ -349,6 +358,8 @@ void instrBinary (BinaryInstructionType  i, ScriptValueP& a, const ScriptValueP&
 		case I_GT:		OPERATOR_DI(>);
 		case I_LE:		OPERATOR_DI(<=);
 		case I_GE:		OPERATOR_DI(>=);
+		case I_MIN:		OPERATOR_FUN_DI(min);
+		case I_MAX:		OPERATOR_FUN_DI(max);
 		case I_OR_ELSE:
 			if (at == SCRIPT_ERROR) a = b;
 			break;

src/script/parser.cpp

@@ -505,9 +505,20 @@ void parseExpr(TokenIterator& input, Script& script, Precedence minPrec) {
 				parseOper(input, script, PREC_ALL); // b
 				expectToken(input, _(")"));
 				script.addInstruction(I_TERNARY, I_RGB);
+			} else if (token == _("min") || token == _("max")) {
+				// min(x,y,z,...)
+				unsigned int op = token == _("min") ? I_MIN : I_MAX;
+				expectToken(input, _("("));
+				parseOper(input, script, PREC_ALL); // first
+				while(input.peek() == _(",")) {
+					expectToken(input, _(","));
+					parseOper(input, script, PREC_ALL); // second, third, etc.
+					script.addInstruction(I_BINARY, op);
+				}
+				expectToken(input, _(")"));
 			} else {
 				// variable
-				unsigned int var = string_to_variable(token.value);
+				Variable var = string_to_variable(token.value);
 				script.addInstruction(I_GET_VAR, var);
 			}
 		} else if (token == TOK_INT) {

src/script/script.hpp

@@ -70,6 +70,8 @@ enum BinaryInstructionType
 ,	I_GT			///< operator >
 ,	I_LE			///< operator <=
 ,	I_GE			///< operator >=
+,	I_MIN			///< minimum
+,	I_MAX			///< maximum
 // Error handling
 ,	I_OR_ELSE		///< if a != error then a else b
 };