Copyright (c) 2008, http://www.snakeyaml.org
Licensed 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.
/**
 * Copyright (c) 2008, http://www.snakeyaml.org
 *
 * Licensed 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.yaml.snakeyaml.error;

import java.io.Serializable;

import org.yaml.snakeyaml.scanner.Constant;

It's just a record and its only use is producing nice error messages. Parser
does not use it for any other purposes.
/**
 * It's just a record and its only use is producing nice error messages. Parser
 * does not use it for any other purposes.
 */
public final class Mark implements Serializable {
    private String name;
    private int index;
    private int line;
    private int column;
    private int[] buffer;
    private int pointer;

    private static int[] toCodePoints(char[] str) {
        int[] codePoints = new int[Character.codePointCount(str, 0, str.length)];
        for (int i = 0, c = 0; i < str.length; c++) {
            int cp = Character.codePointAt(str, i);
            codePoints[c] = cp;
            i += Character.charCount(cp);
        }
        return codePoints;
    }

    public Mark(String name, int index, int line, int column, char[] str, int pointer) {
        this(name, index, line, column, toCodePoints(str), pointer);
    }
    
    /*
     * Existed in older versions but replaced with {@code char[]}-based constructor.
     * Restored in v1.22 for backwards compatibility.
     * @deprecated Since restored in v1.22.  Use {@link Mark#Mark(String, int, int, int, char[], int)}.
     */
    @Deprecated
    public Mark(String name, int index, int line, int column, String buffer, int pointer) {
        this(name, index, line, column, buffer.toCharArray(), pointer);
    }

    public Mark(String name, int index, int line, int column, int[] buffer, int pointer) {
        super();
        this.name = name;
        this.index = index;
        this.line = line;
        this.column = column;
        this.buffer = buffer;
        this.pointer = pointer;
    }

    private boolean isLineBreak(int c) {
        return Constant.NULL_OR_LINEBR.has(c);
    }

    public String get_snippet(int indent, int max_length) {
        float half = max_length / 2f - 1f;
        int start = pointer;
        String head = "";
        while ((start > 0) && !isLineBreak(buffer[start - 1])) {
            start -= 1;
            if (pointer - start > half) {
                head = " ... ";
                start += 5;
                break;
            }
        }
        String tail = "";
        int end = pointer;
        while ((end < buffer.length) && !isLineBreak(buffer[end])) {
            end += 1;
            if (end - pointer > half) {
                tail = " ... ";
                end -= 5;
                break;
            }
        }

        StringBuilder result = new StringBuilder();
        for (int i = 0; i < indent; i++) {
            result.append(" ");
        }
        result.append(head);
        for (int i = start; i < end; i++) {
            result.appendCodePoint(buffer[i]);
        }
        result.append(tail);
        result.append("\n");
        for (int i = 0; i < indent + pointer - start + head.length(); i++) {
            result.append(" ");
        }
        result.append("^");
        return result.toString();
    }

    public String get_snippet() {
        return get_snippet(4, 75);
    }

    @Override
    public String toString() {
        String snippet = get_snippet();
        StringBuilder builder = new StringBuilder(" in ");
        builder.append(name);
        builder.append(", line ");
        builder.append(line + 1);
        builder.append(", column ");
        builder.append(column + 1);
        builder.append(":\n");
        builder.append(snippet);
        return builder.toString();
    }

    public String getName() {
        return name;
    }

    
starts with 0
Returns:
line number/**
     * starts with 0
     * @return line number
     */
    public int getLine() {
        return line;
    }

    
starts with 0
Returns:
column number/**
     * starts with 0
     * @return column number
     */
    public int getColumn() {
        return column;
    }

    
starts with 0
Returns:
character number/**
     * starts with 0
     * @return character number
     */
    public int getIndex() {
        return index;
    }

    public int[] getBuffer() {
        return buffer;
    }

    public int getPointer() {
        return pointer;
    }
}