Misc. changes

[mir.git] / source / mir / generator / GeneratorLibraryRepository.java

diff --git a/source/mir/generator/GeneratorLibraryRepository.java b/source/mir/generator/GeneratorLibraryRepository.java
new file mode 100755 (executable)
index 0000000..046312c
--- /dev/null
+++ b/source/mir/generator/GeneratorLibraryRepository.java
@@ -0,0 +1,70 @@
+package mir.generator;
+
+import java.util.*;
+import mir.util.*;
+
+public class GeneratorLibraryRepository {
+  private Map factories;
+
+  public GeneratorLibraryRepository() {
+    factories = new HashMap();
+  }
+
+  public void registerLibraryFactory(String aName, Generator.GeneratorLibraryFactory aFactory) {
+    factories.put(aName, aFactory);
+  }
+
+  public Generator.GeneratorLibrary constructLibrary(String aName, String aParameters) throws GeneratorExc {
+    if (!factories.containsKey(aName))
+      throw new GeneratorExc("Unknown library factory: "+aName);
+
+    return ((Generator.GeneratorLibraryFactory) factories.get(aName)).makeLibrary(aParameters);
+  }
+
+  private final static String SPACE = "[\t\n\r ]*";
+  private final static String IDENTIFIER = "[a-zA-Z_][a-zA-Z0-9_]*";
+  private final static String EQUALS = "=";
+  private final static String LEFT_PARENTHESIS = "[(]";
+  private final static String RIGHT_PARENTHESIS = "[)]";
+  private final static String FACTORY_PARAMETERS = "[^)]*";
+  private final static String SEMICOLON = ";";
+
+  public Generator.GeneratorLibrary constructCompositeLibrary(String aSpecification) throws GeneratorExc, GeneratorFailure {
+    //main=freemarker(path=/var/www/test); test=freemarker(path=/var/www/test2)
+    String identifier;
+    String factory;
+    String factoryParameters;
+    CompositeGeneratorLibrary result = new CompositeGeneratorLibrary();
+    boolean first=true;
+
+    SimpleParser parser = new SimpleParser(aSpecification);
+    try {
+      parser.skip(SPACE);
+      while (!parser.isAtEnd()) {
+        identifier = parser.parse(IDENTIFIER, "library key expected");
+        parser.skip(SPACE);
+        parser.parse(EQUALS, "'=' expected");
+        parser.skip(SPACE);
+        factory = parser.parse(IDENTIFIER, "factory name expected");
+        parser.skip(SPACE);
+        parser.parse(LEFT_PARENTHESIS, "'(' expected");
+        factoryParameters = parser.parse(FACTORY_PARAMETERS, "parameters expected");
+        parser.parse(RIGHT_PARENTHESIS, "')' expected");
+
+        result.addLibrary(identifier, constructLibrary(factory, factoryParameters), first);
+        first=false;
+        parser.skip(SPACE);
+
+        if (!parser.isAtEnd()) {
+          parser.parse(SEMICOLON, "; expected");
+        }
+      }
+    }
+    catch (Exception e) {
+      e.printStackTrace(System.out);
+      throw new GeneratorFailure("Failed to construct generator library: " + e.getMessage(), e);
+    }
+
+    return result;
+  }
+}
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