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/* valaexpression.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;
/**
* Base class for all code nodes that might be used as an expression.
*/
public abstract class Vala.Expression : CodeNode {
/**
* The static type of the value of this expression.
*
* The semantic analyzer computes this value.
*/
public DataType value_type { get; set; }
public DataType? formal_value_type { get; set; }
/*
* The static type this expression is expected to have.
*
* The semantic analyzer computes this value, lambda expressions use it.
*/
public DataType target_type { get; set; }
public DataType? formal_target_type { get; set; }
/**
* The symbol this expression refers to.
*/
public weak Symbol symbol_reference { get; set; }
/**
* Specifies that this expression is used as lvalue, i.e. the
* left hand side of an assignment.
*/
public bool lvalue { get; set; }
public TargetValue? target_value { get; set; }
/**
* Returns whether this expression is constant, i.e. whether this
* expression only consists of literals and other constants.
*/
public virtual bool is_constant () {
return false;
}
/**
* Returns whether this expression is pure, i.e. whether this expression
* is free of side-effects.
*/
public abstract bool is_pure ();
/**
* Returns whether this expression is guaranteed to be non-null.
*/
public virtual bool is_non_null () {
return false;
}
/**
* Check whether symbol_references in this expression are at least
* as accessible as the specified symbol.
*/
public virtual bool is_accessible (Symbol sym) {
return true;
}
public Statement? parent_statement {
get {
var expr = parent_node as Expression;
var stmt = parent_node as Statement;
var local = parent_node as LocalVariable;
var initializer = parent_node as MemberInitializer;
if (stmt != null) {
return (Statement) parent_node;
} else if (expr != null) {
return expr.parent_statement;
} else if (local != null) {
return (Statement) local.parent_node;
} else if (initializer != null) {
return ((Expression)initializer.parent_node).parent_statement;
} else {
return null;
}
}
}
public void insert_statement (Block block, Statement stmt) {
block.insert_before (parent_statement, stmt);
}
}
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