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A Java library to compare text files. Forked from http://DaisyDiff.github.io
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/*
  This file is licensed to You under the Apache License, Version 2.0
  (the "License"); you may not use this file except in compliance with
  the License.  You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
*/
package org.outerj.daisy.diff.tag;

import java.io.BufferedReader;
import java.io.IOException;
import java.util.List;

/** splits input into atoms */
public class AtomBuilder {
    private final List atoms;

    public AtomBuilder(final String s, final List atoms) {
        this.atoms = atoms;
        generateAtoms(s);
    }

    public AtomBuilder(final StringBuilder s, final List atoms) {
        this.atoms = atoms;
        generateAtoms(s.toString());
    }

    public AtomBuilder(final BufferedReader in, final List atoms) throws IOException {
        this.atoms = atoms;
        final StringBuilder sb = new StringBuilder();

        boolean allRead = false;
        while (!allRead) {
            final int result = in.read();
            if (result >= 0) {
                sb.append((char) result);
            } else {
                generateAtoms(sb.toString());
                allRead = true;
            }
        }
    }

    private void generateAtoms(final String s) {
        if (atoms.size() > 0)
            throw new IllegalStateException("Atoms can only be generated once");

        final StringBuilder currentWord = new StringBuilder(100);

        for (int i = 0; i < s.length(); i++) {
            final char c = s.charAt(i);

            if (c == '<'
                    && TagAtom
                            .isValidTag(s.substring(i, s.indexOf('>', i) + 1))) {
                // a tag
                if (currentWord.length() > 0) {
                    atoms.add(new TextAtom(currentWord.toString()));
                    currentWord.setLength(0);
                }

                final int end = s.indexOf('>', i);
                atoms.add(new TagAtom(s.substring(i, end + 1)));
                i = end;
            } else if (DelimiterAtom.isValidDelimiter("" + c)) {
                // a delimiter
                if (currentWord.length() > 0) {
                    atoms.add(new TextAtom(currentWord.toString()));
                    currentWord.setLength(0);
                }

                atoms.add(new DelimiterAtom(c));
            } else {
                // something else
                currentWord.append(c);
            }
        }
        if (currentWord.length() > 0) {
            atoms.add(new TextAtom(currentWord.toString()));
            currentWord.setLength(0);
        }
    }

}