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Diffstat (limited to 'src/main/java/io/devnulllabs/openjava/ptree/util/PartialParser.java')
| -rw-r--r-- | src/main/java/io/devnulllabs/openjava/ptree/util/PartialParser.java | 330 |
1 files changed, 330 insertions, 0 deletions
diff --git a/src/main/java/io/devnulllabs/openjava/ptree/util/PartialParser.java b/src/main/java/io/devnulllabs/openjava/ptree/util/PartialParser.java new file mode 100644 index 0000000..c6b2b28 --- /dev/null +++ b/src/main/java/io/devnulllabs/openjava/ptree/util/PartialParser.java @@ -0,0 +1,330 @@ +/* + * PartialParser.java 1.0 + * + * This class can be used to make ptree objects from string. + * + * Jun 11, 1997 mich + * Oct 17, 1997 mich + * + * @see io.devnulllabs.openjava.ptree.ParseTree + * @see io.devnulllabs.openjava.ptree.ParseTreeObject + * @version 1.0 last updated: Oct 17, 1997 + * @author Michiaki Tatsubori + */ +package io.devnulllabs.openjava.ptree.util; + +import java.io.StringReader; + +import io.devnulllabs.openjava.mop.ClosedEnvironment; +import io.devnulllabs.openjava.mop.Environment; +import io.devnulllabs.openjava.mop.MOPException; +import io.devnulllabs.openjava.ptree.Expression; +import io.devnulllabs.openjava.ptree.MemberDeclaration; +import io.devnulllabs.openjava.ptree.MemberDeclarationList; +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.StatementList; +import io.devnulllabs.openjava.tools.DebugOut; +import io.devnulllabs.openjava.tools.parser.Parser; + +/** + * The <code>PartialParser</code> class is + * an utilty class to make ptree objects from string. + * + * @see io.devnulllabs.openjava.ptree.Ptree + * @see io.devnulllabs.openjava.ptree.Expression + * @see io.devnulllabs.openjava.ptree.Statement + * @see io.devnulllabs.openjava.ptree.StatementList + * @see io.devnulllabs.openjava.ptree.MemberDeclaration + * @see io.devnulllabs.openjava.ptree.MemberDeclarationList + * @see io.devnulllabs.openjava.ptree.TypeDeclaration + * @see io.devnulllabs.openjava.ptree.CompilationUnit + */ +public final class PartialParser { + /** + * Constructor should not be called. + * + */ + protected PartialParser() { + } + + private static ParseTree initialize(Environment env, ParseTree p) + throws ParseTreeException { + /* dummy wrapper in case replacement occurs */ + ObjectList holder = new ObjectList(p); + p.accept(new MemberAccessCorrector(env)); + return (ParseTree) holder.get(0); + } + + /** + * Replaces "#s" "#EXPR" "#STMT" "#STMTS" in the given string with + * the given arguments. + * <p> + * "##" is replaced with "#". + * <p> + * <br><blockquote><pre> + * #s arg.toString() + * #EXPR ((Expression) arg).toString() + * #STMT ((Statement) arg).toString() + * #STMTS ((StatementList) arg).toString() + * </pre></blockquote><br> + * + */ + public static final String replace(String base, Object[] args) + throws MOPException { + try { + StringBuffer result = new StringBuffer(); + + int arg_i = 0, index = 0, found; + while ((found = base.indexOf('#', index)) != -1) { + result.append(base.substring(index, found)); + if (base.regionMatches(found, "#STMTS", 0, 6)) { + result.append((StatementList) args[arg_i++]); + index = found + 6; + } else if (base.regionMatches(found, "#STMT", 0, 5)) { + result.append((Statement) args[arg_i++]); + index = found + 5; + } else if (base.regionMatches(found, "#EXPR", 0, 5)) { + result.append((Expression) args[arg_i++]); + index = found + 5; + } else if (base.regionMatches(found, "#s", 0, 2)) { + result.append(args[arg_i++].toString()); + index = found + 2; + } else if (base.regionMatches(found, "##", 0, 2)) { + result.append('#'); + index = found + 2; + } else { + result.append('#'); + index = found + 1; + } + } + result.append(base.substring(index)); + + return result.toString(); + } catch (Exception e) { + /* special exception is better */ + throw new MOPException( + "PartialParser.replace() : " + + "illegal format for arguments : " + + base); + } + } + + public static final String replace(String base, Object a0) + throws MOPException { + return replace(base, new Object[] { a0 }); + } + + public static final String replace(String base, Object a0, Object a1) + throws MOPException { + return replace(base, new Object[] { a0, a1 }); + } + + public static final String replace( + String base, + Object a0, + Object a1, + Object a2) + throws MOPException { + return replace(base, new Object[] { a0, a1, a2 }); + } + + public static final String replace( + String base, + Object a0, + Object a1, + Object a2, + Object a3) + throws MOPException { + return replace(base, new Object[] { a0, a1, a2, a3 }); + } + + public static final String replace( + String base, + Object a0, + Object a1, + Object a2, + Object a3, + Object a4) + throws MOPException { + return replace(base, new Object[] { a0, a1, a2, a3, a4 }); + } + + public static final String replace( + String base, + Object a0, + Object a1, + Object a2, + Object a3, + Object a4, + Object a5) + throws MOPException { + return replace(base, new Object[] { a0, a1, a2, a3, a4, a5 }); + } + + public static final String replace( + String base, + Object a0, + Object a1, + Object a2, + Object a3, + Object a4, + Object a5, + Object a6) + throws MOPException { + return replace(base, new Object[] { a0, a1, a2, a3, a4, a5, a6 }); + } + + public static final String replace( + String base, + Object a0, + Object a1, + Object a2, + Object a3, + Object a4, + Object a5, + Object a6, + Object a7) + throws MOPException { + return replace(base, new Object[] { a0, a1, a2, a3, a4, a5, a6, a7 }); + } + + /** + * Makes a ptree node from the string like : + * <br><blockquote><pre> + * "i + 3" + * </pre></blockquote><br> + * or : + * <br><blockquote><pre> + * "f()" + * </pre></blockquote><br> + * + * @return the expression node which the specified string + * represents. + * @exception MOPException if any critical error occurs. + */ + public static Expression makeExpression(Environment env, String str) + throws MOPException { + DebugOut.println("PP makeExpression() : " + str); + Parser parser = new Parser(new StringReader(str)); + Expression result; + try { + result = parser.Expression(env); + result = (Expression) initialize(env, result); + } catch (Exception e) { + System.err.println("partial parsing failed for : " + str); + System.err.println(e); + System.err.println(env.toString()); + throw new MOPException(e); + } + return result; + } + + /** + * Makes a ptree node from the string like : + * <br><blockquote><pre> + * "i++;" + * </pre></blockquote><br> + * or : + * <br><blockquote><pre> + * "for(;;){ f(); }" + * </pre></blockquote><br> + * <p> + * But local variable declarations are not allowed. + * + * @return the statement node which the specified string + * represents. + * @exception MOPException if any critical error occurs. + */ + public static Statement makeStatement(Environment env, String str) + throws MOPException { + DebugOut.println("PP makeStatement() : " + str); + Parser parser = new Parser(new StringReader(str)); + Statement result; + try { + result = parser.Statement(env); + result = (Statement) initialize(env, result); + } catch (Exception e) { + System.err.println("partial parsing failed for : " + str); + System.err.println(e); + System.err.println(env.toString()); + throw new MOPException(e); + } + return result; + } + + /** + * Makes ptree node from the string like : + * <br><blockquote><pre> + * "i++; j = 3;" + * </pre></blockquote><br> + * <p> + * Local variable declarations like following can also be parsed. + * <br><blockquote><pre> + * "int n, m;" + * </pre></blockquote><br> + * + * @return the statements node which the specified string + * represents. + * @exception MOPException if any critical error occurs. + */ + public static StatementList makeStatementList(Environment env, String str) + throws MOPException { + DebugOut.println("PP makeStatementList() : " + str); + Parser parser = new Parser(new StringReader(str)); + env = new ClosedEnvironment(env); + StatementList result; + try { + result = parser.BlockOrStatementListOpt(env); + result = (StatementList) initialize(env, result); + } catch (Exception e) { + System.err.println("partial parsing failed for : " + str); + System.err.println(e); + System.err.println(env.toString()); + throw new MOPException(e); + } + return result; + } + + /** + * NOT IMPLEMENTED + * Makes ptree node from the string like : + * <br><blockquote><pre> + * "int f(){ return 1; }" + * </pre></blockquote><br> + * or : + * <br><blockquote><pre> + * "public String str;" + * </pre></blockquote><br> + * + * @return the statements node which the specified string + * represents. + * @exception MOPException if any critical error occurs. + */ + public static MemberDeclaration makeMemberDeclaration(String str) + throws MOPException { + MemberDeclaration ret = null; + return ret; + } + + /** + * NOT IMPLEMENTED + * Makes a ptree node from the string like : + * <br><blockquote><pre> + * "int f(){ return 1; }" + + * "public String str;" + * </pre></blockquote><br> + * + * @return the type declarations list node which the specified string + * represents. + * @exception MOPException if any critical error occurs. + */ + public static MemberDeclarationList makeMemberDeclarationList(String str) + throws MOPException { + MemberDeclarationList ret = null; + return ret; + } + +} |