1 files changed, 170 insertions, 0 deletions
diff --git a/src/main/java/io/devnulllabs/openjava/syntax/JavaSyntaxRules.java b/src/main/java/io/devnulllabs/openjava/syntax/JavaSyntaxRules.java
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index 0000000..76d38dc
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+++ b/src/main/java/io/devnulllabs/openjava/syntax/JavaSyntaxRules.java
@@ -0,0 +1,170 @@
+/*
+ * JavaSyntaxRules.java
+ *
+ * comments here.
+ *
+ * @author   Michiaki Tatsubori
+ * @version  %VERSION% %DATE%
+ * @see      java.lang.Object
+ *
+ * COPYRIGHT 1998 by Michiaki Tatsubori, ALL RIGHTS RESERVED.
+ */
+package io.devnulllabs.openjava.syntax;
+
+
+import io.devnulllabs.openjava.mop.Environment;
+import io.devnulllabs.openjava.ptree.Block;
+import io.devnulllabs.openjava.ptree.Expression;
+import io.devnulllabs.openjava.ptree.ObjectList;
+import io.devnulllabs.openjava.ptree.ParseTree;
+import io.devnulllabs.openjava.ptree.ParseTreeException;
+import io.devnulllabs.openjava.ptree.Statement;
+import io.devnulllabs.openjava.ptree.TypeName;
+import io.devnulllabs.openjava.ptree.util.MemberAccessCorrector;
+import io.devnulllabs.openjava.tools.parser.ParseException;
+import io.devnulllabs.openjava.tools.parser.Parser;
+import io.devnulllabs.openjava.tools.parser.Token;
+
+
+/**
+ * The class <code>JavaSyntaxRules</code>
+ * <p>
+ * For example
+ * <pre>
+ * </pre>
+ * <p>
+ *
+ * @author   Michiaki Tatsubori
+ * @version  1.0
+ * @since    $Id: JavaSyntaxRules.java,v 1.2 2003/02/19 02:54:31 tatsubori Exp $
+ * @see java.lang.Object
+ */
+public class JavaSyntaxRules implements TokenID
+{
+    private JavaSyntaxRules() {}
+
+    private static ParseException lastException = null;
+    public static SyntaxException getLastException() {
+    return new SyntaxException( lastException );
+    }
+
+    private static ParseTree correct( ParseTree ptree, Environment env ) {
+    MemberAccessCorrector corrector
+        = new MemberAccessCorrector( env );
+    ObjectList holder = new ObjectList( ptree );
+    try {
+        ptree.accept( corrector );
+    } catch ( ParseTreeException e ) {
+        System.err.println( e.getMessage() );
+    }
+    return (ParseTree) holder.get( 0 );
+    }
+
+    private static void
+    adjustTokenSource( TokenSource token_src, Token last_token ) {
+    Token token = token_src.getToken( 0 );
+    while (token != last_token) {
+        token = token_src.getNextToken();
+    }
+    return;
+    }
+
+    /**
+     * Consumes a single expression from given token source.
+     *
+     * @param token_src token source
+     * @param env environment
+     * @return  null if this fail, otherwise an expression.
+     */
+    public static final Expression
+    consumeExpression( TokenSource token_src, Environment env ) {
+    if (env == null)  env = token_src.getEnvironment();
+    RestorableTokenSource dummy = new RestorableTokenSource( token_src );
+    Parser parser = new Parser( dummy );
+    try {
+        Expression ptree = parser.Expression( env );
+        adjustTokenSource( token_src, parser.getToken( 0 ) );
+        return (Expression) correct( ptree, env );
+    } catch ( ParseException e ) {
+        lastException = e;
+        return null;
+    }
+    }
+    public static final Expression
+    consumeExpression( TokenSource token_src ) {
+    return consumeExpression(  token_src, null );
+    }
+
+    /**
+     * Consumes a statement.
+     * This consumes only a pure statement excluding local variable
+     * declarations and local class declarations.
+     *
+     * @param token_src token source
+     * @return  null if this fail, otherwise a statement.
+     */
+    public static final Statement
+    consumeStatement( TokenSource token_src, Environment env ) {
+    if (env == null)  env = token_src.getEnvironment();
+    RestorableTokenSource dummy = new RestorableTokenSource( token_src );
+    Parser parser = new Parser( dummy );
+    try {
+        Statement ptree = parser.Statement( env );
+        adjustTokenSource( token_src, parser.getToken( 0 ) );
+        return (Statement) correct( ptree, env );
+    } catch ( ParseException e ) {
+        lastException = e;
+        return null;
+    }
+    }
+    public static final Statement consumeStatement( TokenSource token_src ) {
+    return consumeStatement(  token_src, token_src.getEnvironment() );
+    }
+
+    /**
+     * Consumes a block.
+     *
+     * @param token_src token source
+     * @return  null if this fail, otherwise a block.
+     */
+    public static final Block
+    consumeBlock( TokenSource token_src, Environment env ) {
+    if (env == null)  env = token_src.getEnvironment();
+    RestorableTokenSource dummy = new RestorableTokenSource( token_src );
+    Parser parser = new Parser( dummy );
+    try {
+        Block ptree = parser.Block( env );
+        adjustTokenSource( token_src, parser.getToken( 0 ) );
+        return (Block) correct( ptree, env );
+    } catch ( ParseException e ) {
+        lastException = e;
+        return null;
+    }
+    }
+    public static final Block consumeBlock( TokenSource token_src ) {
+    return consumeBlock(  token_src, token_src.getEnvironment() );
+    }
+
+    /**
+     * Consumes a type name.
+     * Including primitive type and reference type.
+     *
+     * @param token_src token source
+     * @return  null if this fail, otherwise a block.
+     */
+    public static final TypeName
+    consumeTypeName( TokenSource token_src ) {
+    Environment env = token_src.getEnvironment();
+    RestorableTokenSource dummy = new RestorableTokenSource( token_src );
+    Parser parser = new Parser( dummy );
+    try {
+        TypeName ptree = parser.Type( env );
+        adjustTokenSource( token_src, parser.getToken( 0 ) );
+        return (TypeName) correct( ptree, env );
+    } catch ( ParseException e ) {
+        lastException = e;
+        return null;
+    }
+    }
+
+}