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/* valarealliteral.vala
*
* Copyright (C) 2006-2010 Jürg Billeter
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Author:
* Jürg Billeter <j@bitron.ch>
*/
using GLib;
/**
* Represents a real literal in the source code.
*/
public class Vala.RealLiteral : Literal {
/**
* The literal value.
*/
public string value { get; private set; }
/**
* Creates a new real literal.
*
* @param r literal value
* @param source reference to source code
* @return newly created real literal
*/
public RealLiteral (string r, SourceReference? source = null) {
value = r;
source_reference = source;
}
public override void accept (CodeVisitor visitor) {
visitor.visit_real_literal (this);
visitor.visit_expression (this);
}
public override bool is_pure () {
return true;
}
public override string to_string () {
return value;
}
public override bool check (CodeContext context) {
if (checked) {
return !error;
}
checked = true;
string type_name;
int suf_len = 0;
switch (value[value.length - 1]) {
case 'f':
case 'F':
suf_len = 1;
type_name = "float";
break;
case 'd':
case 'D':
suf_len = 1;
type_name = "double";
break;
default:
type_name = "double";
break;
}
switch (value[value.length - suf_len - 1]) {
case 'e':
case 'E':
case 'p':
case 'P':
case '+':
case '-':
Report.error (source_reference, "exponent has no digits");
error = true;
break;
}
var st = (Struct) context.root.scope.lookup (type_name);
// ensure attributes are already processed
st.check (context);
value_type = new FloatingType (st);
return !error;
}
public override void emit (CodeGenerator codegen) {
codegen.visit_real_literal (this);
codegen.visit_expression (this);
}
}
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