vala/valatemplate.vala

   1 /* valatemplate.vala
   2  *
   3  * Copyright (C) 2009-2010  Jürg Billeter
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
  18  *
  19  * Author:
  20  *      Jürg Billeter <j@bitron.ch>
  21  */
  22
  23
  24 public class Vala.Template : Expression {
  25         private List<Expression> expression_list = new ArrayList<Expression> ();
  26
  27         public Template (SourceReference? source_reference = null) {
  28                 this.source_reference = source_reference;
  29         }
  30
  31         public override void accept (CodeVisitor visitor) {
  32                 visitor.visit_template (this);
  33         }
  34
  35         public override void accept_children (CodeVisitor visitor) {
  36                 foreach (var expr in expression_list) {
  37                         expr.accept (visitor);
  38                 }
  39         }
  40
  41         public void add_expression (Expression expr) {
  42                 expression_list.add (expr);
  43         }
  44
  45         public List<Expression> get_expressions () {
  46                 return expression_list;
  47         }
  48
  49         public override bool is_pure () {
  50                 return false;
  51         }
  52
  53         Expression stringify (Expression expr) {
  54                 if (expr is StringLiteral) {
  55                         return expr;
  56                 } else {
  57                         return new MethodCall (new MemberAccess (expr, "to_string", expr.source_reference), expr.source_reference);
  58                 }
  59         }
  60
  61         public override bool check (CodeContext context) {
  62                 if (checked) {
  63                         return !error;
  64                 }
  65
  66                 checked = true;
  67
  68                 Expression expr;
  69
  70                 if (expression_list.size == 0) {
  71                         expr = new StringLiteral ("\"\"", source_reference);
  72                 } else {
  73                         expr = stringify (expression_list[0]);
  74                         if (expression_list.size > 1) {
  75                                 var concat = new MethodCall (new MemberAccess (expr, "concat", source_reference), source_reference);
  76                                 for (int i = 1; i < expression_list.size; i++) {
  77                                         concat.add_argument (stringify (expression_list[i]));
  78                                 }
  79                                 expr = concat;
  80                         }
  81                 }
  82                 expr.target_type = target_type;
  83
  84                 context.analyzer.add_replaced_node (this);
  85                 parent_node.replace_expression (this, expr);
  86                 return expr.check (context);
  87         }
  88 }
  89