sqrt_expr.cc

来自「由matlab开发的hybrid系统的描述语言」· CC 代码 · 共 72 行

#include "Sqrt_expr.h"
#include "Affine_func.h"
#include "Real_number.h"
#include <stdio.h>
#include "Globals.h"
#include "Problem.h"
#include "Problem_handler.h"

Sqrt_expr::Sqrt_expr(Expr * c) : Unary_expr(c) {
}

void Sqrt_expr::semantic_checks() {
	child->semantic_checks();
	assert(child->is_real()); //fine
}


Affine_func * Sqrt_expr::compute_affine() const {
	Affine_func * aff;

	aff = new Affine_func(clone(), globals); // put this as constant
	return aff;
}

bool Sqrt_expr::is_affine() const {
	return child->is_const();
}


bool Sqrt_expr::is_number() const {
	return child->is_number();
}

Number * Sqrt_expr::compute_number() const {
	Real_number * num;

	num = (Real_number *) child->compute_number();
	num->sqrt();
	return num;
}


string Sqrt_expr::arg_range_check_matlab() const {
	string res;
	string msg;
	char buf[100];

	res += Unary_expr::arg_range_check_matlab();
	if (child->is_number()) { // warn if = 0 ???
		if (((Real_number *) child->compute_number())->get_double() < 0.0) {
			sprintf(buf, "line %d: ", get_source_line());
			msg = buf;
			msg += string("sqrt of negative (") +
				child->get_source() + string(")");
			globals->problem_handler->process(
				new Problem(ERROR, msg));
		}
	} else if (child->is_const()) {
		res += string("if ") + child->to_matlab() + string(" < 0.0") +
			string(" then error(\'");
		sprintf(buf, "line %d: ", get_source_line());
		res += buf;
		res += string("sqrt of negative (") +
			child->get_source() + string(")");
		res += string("\'); end\n");
	}
	return res;
}