--- parser3/src/classes/Attic/root.C	2001/03/12 17:16:48	1.26
+++ parser3/src/classes/Attic/root.C	2001/03/13 11:15:03	1.35
@@ -3,26 +3,38 @@
 	Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
 	Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
 
-	$Id: root.C,v 1.26 2001/03/12 17:16:48 paf Exp $
+	$Id: root.C,v 1.35 2001/03/13 11:15:03 paf Exp $
 */
 
 #include <string.h>
+#include <math.h>
 
 #include "pa_request.h"
 #include "_root.h"
+#include "pa_vint.h"
+#include "pa_common.h"
+
+static void _if(Request& r, const String& method_name, Array *params) {
+	Value& condition_code=*static_cast<Value *>(params->get(0));
+	// forcing ^if(this param type)
+	r.fail_if_junction_(false, condition_code, 
+		method_name, "condition must be junction");
+	bool condition=r.process(condition_code, 
+		0/*no name*/,
+		false/*don't intercept string*/).get_bool();
 
-static void _if(Request& r, const String&, Array *params) {
-	bool condition=
-		r.process(
-			*static_cast<Value *>(params->get(0)), 
-			0/*no name*/,
-			false/*don't intercept string*/).get_bool();
 	if(condition) {
-		Value& value=r.process(*static_cast<Value *>(params->get(1)));
-		r.write_pass_lang(value);
+		Value& then_code=*static_cast<Value *>(params->get(1));
+		// forcing ^if(this param type)
+		r.fail_if_junction_(false, then_code, 
+			method_name, "then-parameter must be junction");
+		r.write_pass_lang(r.process(then_code));
 	} else if(params->size()==3) {
-		Value& value=r.process(*static_cast<Value *>(params->get(2)));
-		r.write_pass_lang(value);
+		Value& else_code=*static_cast<Value *>(params->get(2));
+		// forcing ^if(this param type)
+		r.fail_if_junction_(false, else_code, 
+			method_name, "else-parameter must be junction");
+		r.write_pass_lang(r.process(else_code));
 	}
 }
 
@@ -82,10 +94,148 @@ static void _process(Request& r, const S
 }
 	
 static void _rem(Request& r, const String& method_name, Array *params) {
+	// forcing ^rem{this param type}
 	r.fail_if_junction_(false, *static_cast<Value *>(params->get(0)), 
 		method_name, "body must be junction");
 }
 
+static void _while(Request& r, const String& method_name, Array *params) {
+	Value& vcondition=*static_cast<Value *>(params->get(0));
+	// forcing ^while(this param type){}
+	r.fail_if_junction_(false, vcondition, 
+		method_name, "condition must be junction");
+	
+	Value& body=*static_cast<Value *>(params->get(1));
+	// forcing ^while(){this param type}
+	r.fail_if_junction_(false, body, 
+		method_name, "body must be junction");
+
+	// while...
+	int endless_loop_count=0;
+	while(true) {
+		if(++endless_loop_count>=1973) // endless loop?
+			R_THROW(0, 0,
+				&method_name,
+				"endless loop detected");
+
+		bool condition=
+			r.process(
+				vcondition, 
+				0/*no name*/,
+				false/*don't intercept string*/).get_bool();
+		if(!condition) // ...condition is true
+			break;
+
+		// write processed body
+		r.write_pass_lang(r.process(body));
+	}
+}
+
+static void _use(Request& r, const String& method_name, Array *params) {
+	Value& vfile=*static_cast<Value *>(params->get(0));
+	// forcing ^rem{this param type}
+	r.fail_if_junction_(true, vfile, 
+		method_name, "file name must not be junction");
+
+	char *file=vfile.as_string().cstr();
+	r.use_file(r.absolute(file));
+}
+
+static void _for(Request& r, const String& method_name, Array *params) {
+	// ^for[i;from-number;to-number-inclusive]{code}[delim]
+
+	Pool& pool=r.pool();
+	const String& var_name=r.process(*static_cast<Value *>(params->get(0))).as_string();
+	int from=(int)r.process(*static_cast<Value *>(params->get(1))).get_double();
+	int to=(int)r.process(*static_cast<Value *>(params->get(2))).get_double();
+	Value& body_code=*static_cast<Value *>(params->get(3));
+	// forcing ^menu{this param type}
+	r.fail_if_junction_(false, body_code, 
+		method_name, "body must be junction");
+	Value *delim_code=params->size()==3+1+1?static_cast<Value *>(params->get(3+1)):0;
+
+	bool need_delim=false;
+	int endless_loop_count=0;
+	for(VInt *vint=new(pool) VInt(pool, from); vint->get_int()<=to; vint->inc()) {
+		if(++endless_loop_count>=2001) // endless loop?
+			R_THROW(0, 0,
+				&method_name,
+				"endless loop detected");
+		r.wcontext->put_element(var_name, vint);
+
+		Value& processed_body=r.process(body_code);
+		if(delim_code) { // delimiter set?
+			const String *string=processed_body.get_string();
+			if(need_delim && string && string->size()) // need delim & iteration produced string?
+				r.write_pass_lang(r.process(*delim_code));
+			need_delim=true;
+		}
+		r.write_pass_lang(processed_body);
+	}
+}
+
+static void _eval(Request& r, const String& method_name, Array *params) {
+	Value& expr=*static_cast<Value *>(params->get(0));
+	r.fail_if_junction_(false, expr, 
+		method_name, "need expression");
+	// evaluate expresion
+	Value *result=r.process(expr, 
+		0/*no name*/,
+		true/*don't intercept string*/).get_expr_result();
+	if(params->size()==2) {
+		Value& fmt=*static_cast<Value *>(params->get(1));
+		// forcing ^format[this param type]
+		r.fail_if_junction_(true, fmt, 
+			method_name, "fmt must not be junction");
+
+		Pool& pool=r.pool();
+		String *string=new(pool) String(pool);
+		string->APPEND_CONST(format(pool, result->get_double(), fmt.as_string().cstr()));
+		result=new(pool) VString(*string);
+	}
+	r.wcontext->write(*result,  String::Untaint_lang::NO /*always object, not string*/);
+}
+
+
+typedef double (*math_one_double_op_func_ptr)(double);
+static double round(double op) { return floor(op+0.5); }
+static double sign(double op) { return op > 0 ? 1 : ( op < 0 ? -1 : 0 ); }
+
+static void _math_one_double_op(
+								Request& r, 
+								const String& method_name, Array *params,
+								math_one_double_op_func_ptr func) {
+	Pool& pool=r.pool();
+	Value& param=*static_cast<Value *>(params->get(0));
+
+	// forcing ^round(this param type)
+	r.fail_if_junction_(false, param, 
+		method_name, "parameter must be expression");
+
+	Value& result=*new(pool) VDouble(pool, (*func)(r.process(param).get_double()));
+	r.wcontext->write(result, String::Untaint_lang::NO /*always object, not string*/);
+}
+
+static void _round(Request& r, const String& method_name, Array *params) {
+	_math_one_double_op(r, method_name, params,	&round);
+}
+
+static void _floor(Request& r, const String& method_name, Array *params) {
+	_math_one_double_op(r, method_name, params,	&floor);
+}
+
+static void _ceiling(Request& r, const String& method_name, Array *params) {
+	_math_one_double_op(r, method_name, params,	&ceil);
+}
+
+static void _abs(Request& r, const String& method_name, Array *params) {
+	_math_one_double_op(r, method_name, params,	&fabs);
+}
+
+static void _sign(Request& r, const String& method_name, Array *params) {
+	_math_one_double_op(r, method_name, params,	&sign);
+}
+
 void initialize_root_class(Pool& pool, VClass& vclass) {
 	// ^if(condition){code-when-true}
 	// ^if(condition){code-when-true}{code-when-false}
@@ -99,4 +249,35 @@ void initialize_root_class(Pool& pool, V
 
 	// ^rem{code}
 	vclass.add_native_method("rem", _rem, 1, 1);
+
+	// ^while(condition){code}
+	vclass.add_native_method("while", _while, 2, 2);
+
+	// ^use[file]
+	vclass.add_native_method("use", _use, 1, 1);
+
+	// ^for[i;from-number;to-number-inclusive]{code}[delim]
+	vclass.add_native_method("for", _for, 3+1, 3+1+1);
+
+	// ^eval(expr)
+	// ^eval(expr)[format]
+	vclass.add_native_method("eval", _eval, 1, 2);
+
+
+	// math functions
+
+	// ^round(expr)	
+	vclass.add_native_method("round", _round, 1, 1);
+
+	// ^floor(expr)	
+	vclass.add_native_method("floor", _floor, 1, 1);
+
+	// ^ceiling(expr)	
+	vclass.add_native_method("ceiling", _ceiling, 1, 1);
+
+	// ^abs(expr)	
+	vclass.add_native_method("abs", _abs, 1, 1);
+
+	// ^sign(expr)
+	vclass.add_native_method("sign", _sign, 1, 1);
 }