/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

import java.io.*;

import java.util.*;

public class MacroDefinitions {

    private Vector macros;

    public MacroDefinitions() {

        macros = new Vector();

    }

    public void addMacro(String name, String contents) {

        Macro macro = new Macro();

        macro.name = name;

        macro.contents = contents;

        macros.add(macro);

    }

    private boolean lineIsEmpty(String s) {

        for (int i = 0; i < s.length(); i++) {

            if (!Character.isWhitespace(s.charAt(i))) {

                return false;

            }

        }

        return true;

    }

    public void readFrom(String fileName, boolean missingOk)

        throws FileNotFoundException, FileFormatException, IOException {

        BufferedReader reader = null;

        try {

            reader = new BufferedReader(new FileReader(fileName));

        } catch (FileNotFoundException e) {

            if (missingOk) {

                return;

            } else {

                throw(e);

            }

        }

        String line;

        do {

            line = reader.readLine();

            if (line != null) {

                // This had to be rewritten (compare to Database.java)

                // because the Solaris platform file has been

                // repurposed and now contains "macros" with spaces in

                // them.

                if ((!line.startsWith("//")) &&

                    (!lineIsEmpty(line))) {

                    int nameBegin = -1;

                    int nameEnd = -1;

                    boolean gotEquals = false;

                    int contentsBegin = -1;

                    int contentsEnd = -1;

                    int i = 0;

                    // Scan forward for beginning of name

                    while (i < line.length()) {

                        if (!Character.isWhitespace(line.charAt(i))) {

                            break;

                        }

                        i++;

                    }

                    nameBegin = i;

                    // Scan forward for end of name

                    while (i < line.length()) {

                        if (Character.isWhitespace(line.charAt(i))) {

                            break;

                        }

                        i++;

                    }

                    nameEnd = i;

                    // Scan forward for equals sign

                    while (i < line.length()) {

                        if (line.charAt(i) == '=') {

                            gotEquals = true;

                            break;

                        }

                        i++;

                    }

                    // Scan forward for start of contents

                    i++;

                    while (i < line.length()) {

                        if (!Character.isWhitespace(line.charAt(i))) {

                            break;

                        }

                        i++;

                    }

                    contentsBegin = i;

                    // Scan *backward* for end of contents

                    i = line.length() - 1;

                    while (i >= 0) {

                        if (!Character.isWhitespace(line.charAt(i))) {

                            break;

                        }

                    }

                    contentsEnd = i+1;

                    // Now do consistency check

                    if (!((nameBegin < nameEnd) &&

                          (nameEnd < contentsBegin) &&

                          (contentsBegin < contentsEnd) &&

                          (gotEquals == true))) {

                        throw new FileFormatException(

                            "Expected \"macroname = value\", " +

                            "but found: " + line

                        );

                    }

                    String name = line.substring(nameBegin, nameEnd);

                    String contents = line.substring(contentsBegin,

                                                     contentsEnd);

                    addMacro(name, contents);

                }

            }

        } while (line != null);

        reader.close();

    }

    /** This returns an Iterator of Macros. You should not mutate the

        returned Macro objects or use the Iterator to remove

        macros. */

    public Iterator getMacros() {

        return macros.iterator();

    }

}