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Office-stamper is a Java template engine for docx documents, forked from org.wickedsource.docx-stamper
There is a newer version: 2.6.0
package pro.verron.officestamper.core;

import org.docx4j.wml.R;
import org.docx4j.wml.RPr;

/**
 * Represents a run (i.e., a text fragment) in a paragraph. The run is indexed relative to the containing paragraph
 * and also relative to the containing document.
 *
 * @param startIndex    the start index of the run relative to the containing paragraph.
 * @param endIndex      the end index of the run relative to the containing paragraph.
 * @param indexInParent the index of the run relative to the containing document.
 * @param run           the run itself.
 *
 * @author Joseph Verron
 * @author Tom Hombergs
 * @version ${version}
 * @since 1.0.0
 */
public record IndexedRun(int startIndex, int endIndex, int indexInParent, R run) {

    public int length() {
        return getText().length();
    }

    public String getText() {
        return RunUtil.getText(run());
    }

    public String substring(int endIndex) {
        return getText().substring(endIndex);
    }

    public String substring(int beginIndex, int endIndex) {
        return getText().substring(beginIndex, endIndex);
    }

    public int indexOf(String full) {
        return getText().indexOf(full);
    }

    public RPr getPr() {
        return run.getRPr();
    }

    /**
     * Determines whether the specified range of start and end index touches this run.
     * 
     * Example:
     * 

     * Given this run: [a,b,c,d,e,f,g,h,i,j]
     * 

     * And the range [2,5]
     * 
     * This method will return true, because the range touches the run at the indices 2, 3, 4 and 5.
     *
     * @param globalStartIndex the global index (meaning the index relative to multiple aggregated runs) at which to
     *                         start the range.
     * @param globalEndIndex   the global index (meaning the index relative to multiple aggregated runs) at which to end
     *                         the range.
     *
     * @return true, if the range touches this run, false otherwise.
     */
    public boolean isTouchedByRange(int globalStartIndex, int globalEndIndex) {
        var startBetweenIndices = (globalStartIndex < startIndex) && (startIndex <= globalEndIndex);
        var endBetweenIndices = (globalStartIndex < endIndex) && (endIndex <= globalEndIndex);
        return startBetweenIndices
               || endBetweenIndices
               || ((startIndex <= globalStartIndex) && (globalEndIndex <= endIndex));

    }

    /**
     * Replaces the substring starting at the given index with the given replacement string.
     *
     * @param globalStartIndex the global index (meaning the index relative to multiple aggregated runs) at which to
     *                         start the replacement.
     * @param globalEndIndex   the global index (meaning the index relative to multiple aggregated runs) at which to end
     *                         the replacement.
     * @param replacement      the string to replace the substring at the specified global index.
     */
    public void replace(
            int globalStartIndex,
            int globalEndIndex,
            String replacement
    ) {
        int localStartIndex = globalIndexToLocalIndex(globalStartIndex);
        int localEndIndex = globalIndexToLocalIndex(globalEndIndex);
        var text = RunUtil.getSubstring(run, 0, localStartIndex);
        text += replacement;
        String runText = RunUtil.getText(run);
        if (!runText.isEmpty()) {
            text += RunUtil.getSubstring(run, localEndIndex);
        }
        RunUtil.setText(run, text);
    }

    private int globalIndexToLocalIndex(int globalIndex) {
        if (globalIndex < startIndex) return 0;
        else if (globalIndex > endIndex) return RunUtil.getLength(run);
        else return globalIndex - startIndex;
    }
}