bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/annotations/AnnotationUtils.java

   1 package org.simantics.scl.compiler.elaboration.expressions.annotations;
   2
   3 import org.simantics.scl.compiler.constants.StringConstant;
   4 import org.simantics.scl.compiler.elaboration.expressions.ELiteral;
   5 import org.simantics.scl.compiler.elaboration.expressions.EStringLiteral;
   6 import org.simantics.scl.compiler.elaboration.expressions.EVar;
   7 import org.simantics.scl.compiler.elaboration.expressions.Expression;
   8 import org.simantics.scl.compiler.errors.ErrorLog;
   9 import org.simantics.scl.compiler.internal.parsing.declarations.DAnnotationAst;
  10
  11 public class AnnotationUtils {
  12     /**
  13      * Processes an annotation of form
  14      * <pre>&#64;Annotation "text"</pre>
  15      * or
  16      * <pre>&#64;Annotation text</pre>
  17      */
  18     public static String processStringAnnotation(ErrorLog errorLog, DAnnotationAst annotation) {
  19         if(annotation.parameters.length != 1)
  20             errorLog.log(annotation.location, "Expected one string parameter for " + annotation.id.text);
  21         String result = extractString(annotation.parameters[0]);
  22         if(result == null)
  23             errorLog.log(annotation.location, "Expected a string parameter for " + annotation.id.text);
  24         return result;
  25     }
  26
  27     public static void processTagAnnotation(ErrorLog errorLog, DAnnotationAst annotation) {
  28         if(annotation.parameters.length != 0)
  29             errorLog.log(annotation.location, "Expected no parameters for " + annotation.id.text);
  30     }
  31
  32     public static String extractString(Expression expression) {
  33         if(expression instanceof EVar)
  34             return ((EVar)expression).name;
  35         else if(expression instanceof EStringLiteral) {
  36             EStringLiteral literal = (EStringLiteral)expression;
  37             if(literal.strings.length == 1)
  38                 return literal.strings[0];
  39         }
  40         else if(expression instanceof ELiteral) {
  41             ELiteral literal = (ELiteral)expression;
  42             if(literal.getValue() instanceof StringConstant) {
  43                 StringConstant constant = (StringConstant)literal.getValue();
  44                 return constant.getValue();
  45             }
  46         }
  47         return null;
  48     }
  49 }