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package Torello.JavaDoc;


// *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
// Java-HTML Imports
// *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

import Torello.Java.*;

import static Torello.Java.C.*;
import static Torello.JavaDoc.PF.*;


// *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
// Standard-Java Imports
// *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

import java.util.Optional;
import java.io.IOException;


// *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
// The new Source-Code Parser: com.sun.source.*
// *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

import com.sun.source.tree.Tree;
import com.sun.source.doctree.DocCommentTree;

/**
 * Location Information storing line-number, column-number and character-number for items inside
 * of a Java Source-Code File (a {@code '.java'} file).
 */
public class Location implements java.io.Serializable, Cloneable
{
    /** <EMBED CLASS='external-html' DATA-FILE-ID=SVUID> */
    protected static final long serialVersionUID = 1;


    // ********************************************************************************************
    // ********************************************************************************************
    // This class' public fields
    // ********************************************************************************************
    // ********************************************************************************************


    /** <EMBED CLASS='external-html' DATA-FILE-ID=LOC_SIG_START_POS> */
    public final int signatureStartPos;

    /** <EMBED CLASS='external-html' DATA-FILE-ID=LOC_SIG_START_LINE> */
    public final int signatureStartLine;

    /** <EMBED CLASS='external-html' DATA-FILE-ID=LOC_SIG_START_COL> */
    public final int signatureStartCol;


    /** <EMBED CLASS='external-html' DATA-FILE-ID=LOC_SIG_END_POS> */
    public final int signatureEndPos;

    /** <EMBED CLASS='external-html' DATA-FILE-ID=LOC_SIG_END_LINE> */
    public final int signatureEndLine;

    /** <EMBED CLASS='external-html' DATA-FILE-ID=LOC_SIG_END_COL> */
    public final int signatureEndCol;


    /** <EMBED CLASS='external-html' DATA-FILE-ID=LOC_JDC_START_POS> */
    public final int jdcStartPos;

    /** <EMBED CLASS='external-html' DATA-FILE-ID=LOC_JDC_START_LINE> */
    public final int jdcStartLine;

    /** <EMBED CLASS='external-html' DATA-FILE-ID=LOC_JDC_START_COL> */
    public final int jdcStartCol;


    /** <EMBED CLASS='external-html' DATA-FILE-ID=LOC_JDC_END_POS> */
    public final int jdcEndPos;

    /** <EMBED CLASS='external-html' DATA-FILE-ID=LOC_JDC_END_LINE> */
    public final int jdcEndLine;

    /** <EMBED CLASS='external-html' DATA-FILE-ID=LOC_JDC_END_COL> */
    public final int jdcEndCol;


    /** <EMBED CLASS='external-html' DATA-FILE-ID=LOC_BODY_START_POS> */
    public final int bodyStartPos;

    /** <EMBED CLASS='external-html' DATA-FILE-ID=LOC_BODY_START_LINE> */
    public final int bodyStartLine;

    /** <EMBED CLASS='external-html' DATA-FILE-ID=LOC_BODY_START_COL> */
    public final int bodyStartCol;


    /** <EMBED CLASS='external-html' DATA-FILE-ID=LOC_BODY_END_POS> */
    public final int bodyEndPos;

    /** <EMBED CLASS='external-html' DATA-FILE-ID=LOC_BODY_END_LINE> */
    public final int bodyEndLine;

    /** <EMBED CLASS='external-html' DATA-FILE-ID=LOC_BODY_END_COL> */
    public final int bodyEndCol;


    // ********************************************************************************************
    // ********************************************************************************************
    // Constructor - com.sun.source.tree 
    // ********************************************************************************************
    // ********************************************************************************************


    Location(TreeUtils util, Tree tree, DocCommentTree dct, Tree body, Tree fieldInitializerTree)
    {
        // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
        // Java-Doc Comments Location-Information
        // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

        if (dct == null)
        {
            // If this 'entity' doesn't have a JavaDoc Comment, then set these to '-1'
            this.jdcStartPos    = this.jdcEndPos    = -1;
            this.jdcStartLine   = this.jdcEndLine   = -1;
            this.jdcStartCol    = this.jdcEndCol    = -1;
        }

        else
        {
            int sPos = (int) util.docSourcePositions.getStartPosition
                (util.compilationUnitTree, dct, dct);

            int ePos = (int) util.docSourcePositions.getEndPosition
                (util.compilationUnitTree, dct, dct);

            /*
            if (ePos == -1)
            {
                System.out.println(
                    "util.srcFileName: " + util.srcFileName + '\n' +
                    "sPos: " + sPos + ", ePos: " + ePos + '\n' +
                    "util.srcFileAsStr.substring(sPos, sPos+50): " +
                        util.srcFileAsStr.substring(sPos, sPos+50)
                );
        
                try { System.out.println("str: " + util.srcFileAsStr.substring(sPos, ePos)); }
                catch (Exception e) { System.out.println("e.getMessage(): " + e.getMessage()); }
            }
            */

            // This happens multiple times in both "TreeUtils" and "Location".  I have explained
            // this one twice, and I'm not going to do it a third time.  Run GREP/Search for the 
            // line: "if (ePos < 0) ePos = sPos;" in this file (Location.java) and in
            //  (TreeUtils.java)

            if (ePos < 0) ePos = sPos;

            // This can happen if the code has a /**  */ above a field or method that turns out to
            // just be totally and completely empty!  I am a little busy at the moment documenting
            // something else.  March 5th, 2024.  This is trivial, but I am not doing right now.

            if (ePos == -1) throw new Torello.Java.ToDoException(
                "This really needs to be analyzed, and it is likely very easy, but I am in the " +
                "middle of another documentation-thing right now...\n\n" +
                "To Quickly Fix your problem, make sure there are no JavaDoc Comments that look " +
                "like /** */ - where there is nothing but white-space inside your comment.\n\n" +
                "I will get to this hopefully soon.  Today is March 4th, 2024."
            );

            while (sPos >= 2)
                if (util.srcFileAsStr.charAt(sPos--) == '*')
                    if (util.srcFileAsStr.regionMatches(sPos - 1, "/**", 0, 3))
                    { sPos--; break; }

            int MAX = util.srcFileAsStr.length() - 2;

            while (ePos < MAX)
                if (util.srcFileAsStr.charAt(ePos++) == '*')
                    if (util.srcFileAsStr.regionMatches(ePos - 1, "*/", 0, 2))
                    { ePos++; break; }

            this.jdcStartPos    = sPos;
            this.jdcEndPos      = ePos;

            this.jdcStartLine   = (int) util.lineMap.getLineNumber(sPos);
            this.jdcEndLine     = (int) util.lineMap.getLineNumber(ePos);

            this.jdcStartCol    = positionToColumn(this.jdcStartPos, util.srcFileAsStr);
            this.jdcEndCol      = positionToColumn(this.jdcEndPos, util.srcFileAsStr);

            /*
            System.out.println(
                "TU: " + StrPrint.abbrev(
                    util.srcFileAsStr.substring(this.jdcStartPos, this.jdcEndPos),
                    60, true, null, 120
                ));
            */
        }


        // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
        // Body Location-Information
        // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
        //
        // NOTE: Fields that do not have any initialization expressions, and absolutely enum
        //       constants - will not have a body, and the 'body' parameter will be null in such
        //       cases.  Annotation-Elements without a default-value may pass null to the body too,
        //       as could a method defined inside of an interface that doesn't have a definition.

        if (body == null)
        {
            // If this 'entity' doesn't have a Body, then set these to '-1'
            this.bodyStartPos   = this.bodyEndPos   = -1;
            this.bodyStartLine  = this.bodyEndLine  = -1;
            this.bodyStartCol   = this.bodyEndCol   = -1;
        }
        else
        {
            this.bodyStartPos = (int) util.sourcePositions.getStartPosition
                (util.compilationUnitTree, body);

            this.bodyEndPos = (int) util.sourcePositions.getEndPosition
                (util.compilationUnitTree, body);

            this.bodyStartLine  = (int) util.lineMap.getLineNumber(this.bodyStartPos);
            this.bodyEndLine    = (int) util.lineMap.getLineNumber(this.bodyEndPos);

            this.bodyStartCol   = positionToColumn(this.bodyStartPos, util.srcFileAsStr);
            this.bodyEndCol     = positionToColumn(this.bodyEndPos, util.srcFileAsStr);

            /*
            System.out.println(
                "TU: " + StrPrint.abbrev(
                    util.srcFileAsStr.substring(this.bodyStartPos, this.bodyEndPos),
                    60, true, null, 120
                ));
            */
        }


        // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
        // Signature Location-Information
        // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

        this.signatureStartPos = (int) util.sourcePositions.getStartPosition
            (util.compilationUnitTree, tree);

        this.signatureStartLine = (int) util.lineMap.getLineNumber(this.signatureStartPos);
        this.signatureStartCol  = positionToColumn(this.signatureStartPos, util.srcFileAsStr);

        if (fieldInitializerTree != null)
        {
            // NOTE: Here, a '+1' is added at the very end of the statement to account for the
            //       ending semi-colon, which Java-Parser is adding.

            this.signatureEndPos = (int) util.sourcePositions.getEndPosition
                (util.compilationUnitTree, fieldInitializerTree) + 1;

            this.signatureEndLine   = (int) util.lineMap.getLineNumber(this.signatureEndPos);
            this.signatureEndCol    = positionToColumn(this.signatureEndPos, util.srcFileAsStr);
        }
        else if (body == null)
        {
            this.signatureEndPos = (int) util.sourcePositions.getEndPosition
                (util.compilationUnitTree, tree);

            this.signatureEndLine   = (int) util.lineMap.getLineNumber(this.signatureEndPos);
            this.signatureEndCol    = positionToColumn(this.signatureEndPos, util.srcFileAsStr);
        }
        else
        {
            int     line    = this.bodyStartLine;
            int     pos     = this.bodyStartPos;
            int     col     = 2;
            char    c       = 0;

            while (Character.isWhitespace(c = util.srcFileAsStr.charAt(--pos))) if (c == '\n') line--;
            while (util.srcFileAsStr.charAt(--pos) != '\n') col++;

            this.signatureEndLine   = line;
            this.signatureEndCol    = col;
            this.signatureEndPos    = pos + col;
        }
    }


    // ********************************************************************************************
    // ********************************************************************************************
    // Constructor for NestedType - com.sun.source.tree
    // ********************************************************************************************
    // ********************************************************************************************


    Location(TreeUtils util, Tree tree, DocCommentTree dct)
    {
        // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
        // Java-Doc Comments Location (COPIED DIRECTLY/VERBATIM FROM PREVIOUS CONSTRUCTOR)
        // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

        if (dct == null)
        {
            // If this 'entity' doesn't have a JavaDoc Comment, then set these to '-1'
            this.jdcStartPos    = this.jdcEndPos    = -1;
            this.jdcStartLine   = this.jdcEndLine   = -1;
            this.jdcStartCol    = this.jdcEndCol    = -1;
        }

        else
        {
            int sPos = (int) util.docSourcePositions.getStartPosition
                (util.compilationUnitTree, dct, dct);

            int ePos = (int) util.docSourcePositions.getEndPosition
                (util.compilationUnitTree, dct, dct);

            // Note that this code was BLOCk-COPIED from class TreeUtils.  This portion of this
            // method is doing the exact same thing that is done in one of the TreeUtil's methods
            // To Summarze, I recently started using Oracle-Cloud-Infrastructure (OCI), instead of
            // Google-Cloud-Platform (GCP).  The version of JavaDoc that is running here is 
            // different, and I want to find any bugs I have to be able to handle more versions of
            // JavaDoc out there.
            //
            // There is a static inner-class inside of Apache.CLI.DefaultParser, that, when parsed,
            // forces the com.sun.source.util.DocSourcePositions.getEndPosition to return "-1"
            //
            // This can be fixed by a small hack, that sets 'ePos' to 'sPos' if it was initially
            // set to '-1'.  The more sophisticated version would be to iterate the elements 
            // returned by dct.getFullBody() (which returns a List<DocTree>).
            // 
            // Now, unfortunately, I wrote that method in 2023 when I was writing TreeUtils &
            // Location, but I have since deleted, becasue the string.position version is much
            // faster.  Later on, I will re-write that method (I think, not sure).

            /*
            System.out.println(
                "util.srcFileName: " + util.srcFileName + '\n' +
                "sPos: " + sPos + ", ePos: " + ePos + '\n' +
                "util.srcFileAsStr.substring(sPos, sPos+50): " +
                    util.srcFileAsStr.substring(sPos, sPos+50)
            );
    
            try { System.out.println("str: " + util.srcFileAsStr.substring(sPos, ePos)); }
            catch (Exception e) { System.out.println("e.getMessage(): " + e.getMessage()); }
            */

            while (sPos >= 2)
                if (util.srcFileAsStr.charAt(sPos--) == '*')
                    if (util.srcFileAsStr.regionMatches(sPos - 1, "/**", 0, 3))
                    { sPos--; break; }

            if (ePos < 0) ePos = sPos; // The Hack

            int MAX = util.srcFileAsStr.length() - 2;
            while (ePos < MAX)
                if (util.srcFileAsStr.charAt(ePos++) == '*')
                    if (util.srcFileAsStr.regionMatches(ePos - 1, "*/", 0, 2))
                    { ePos++; break; }

            this.jdcStartPos    = sPos;
            this.jdcEndPos      = ePos;

            this.jdcStartLine   = (int) util.lineMap.getLineNumber(sPos);
            this.jdcEndLine     = (int) util.lineMap.getLineNumber(ePos);

            this.jdcStartCol    = positionToColumn(this.jdcStartPos, util.srcFileAsStr);
            this.jdcEndCol      = positionToColumn(this.jdcEndPos, util.srcFileAsStr);
        }


        // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
        // Signature Location-Information - ONLY DO THE STARTING PART
        // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

        this.signatureStartPos = (int) util.sourcePositions.getStartPosition
            (util.compilationUnitTree, tree);

        this.signatureStartLine = (int) util.lineMap.getLineNumber(this.signatureStartPos);
        this.signatureStartCol  = positionToColumn(this.signatureStartPos, util.srcFileAsStr);


        // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
        // Now do the body ***AND*** The rest of signature
        // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

        int     line    = this.signatureStartLine;
        int     col     = this.signatureStartCol;
        int     pos     = StrIndexOf.nth(util.srcFileAsStr, line - 1, '\n') + col;
        int     MAX     = util.srcFileAsStr.length() - 1;
        char    c       = 0;

        while ((pos < MAX) && ((c = util.srcFileAsStr.charAt(++pos)) != '{') && (c != ';'))
            if (c == '\n') line++;

        if (c == '{')
        {
            this.bodyStartPos   = pos;
            this.bodyStartLine  = line;
            this.bodyStartCol   = positionToColumn(pos, util.srcFileAsStr);

            this.bodyEndPos = (int) util.sourcePositions.getEndPosition
                (util.compilationUnitTree, tree);

            this.bodyEndLine    = (int) util.lineMap.getLineNumber(this.bodyEndPos);
            this.bodyEndCol     = positionToColumn(this.bodyEndPos, util.srcFileAsStr);


            // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
            // Signature-End
            // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

            while ((--pos > 0) && Character.isWhitespace(c = util.srcFileAsStr.charAt(pos)))
                if (c == '\n') line--;

            this.signatureEndLine   = line;
            this.signatureEndPos    = pos + 1;
            this.signatureEndCol    = positionToColumn(this.signatureEndPos , util.srcFileAsStr);
        }
        else
        {
            this.bodyStartPos = this.bodyStartCol = this.bodyStartLine =
            this.bodyEndPos = this.bodyEndCol = this.bodyEndLine = -1;


            // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
            // Signature-End
            // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

            this.signatureEndPos = (int) util.sourcePositions.getEndPosition
                (util.compilationUnitTree, tree);

            this.signatureEndLine    = (int) util.lineMap.getLineNumber(this.signatureEndPos);
            this.signatureEndCol     = positionToColumn(this.signatureEndPos, util.srcFileAsStr);
        }
    }


    // ********************************************************************************************
    // ********************************************************************************************
    // Two Simple Constructor Helpers
    // ********************************************************************************************
    // ********************************************************************************************


    private static int positionToColumn(int pos, String srcFileAsStr)
    {
        int     col = 1;
        char    c;

        while (     (--pos >= 0)
                &&  ((c = srcFileAsStr.charAt(pos)) != '\n')
                &&  (c != '\r')
        )
            col++;

        return col;
    }

    // It is expected the line1, col1, pos1 define a specific-location / are-"consistent"
    // (I hope you know what I mean by "consistent")
    //
    // ALSO: line2 & col2 are also consistent, and come AFTER the first position

    private static int colAndLineToPosition
        (String srcFileAsStr, int line1, int col1, int pos1, int line2, int col2)
    {
        if (line2 > line1)
        {
            // The presumption, here, is that 'pos1' is a "starting" location - for either the body
            // or the signature.  It **WILL NOT** be a new-line '\n' character, it will be
            // something like the letter 'p' which is the first letter in 'public' or 'private'
            //
            // If this is for a body, then it will hold a '{'  The only reason this code uses 'pos'
            // rather than just re-using 'pos1' from the input-parameter / signature, is for this
            // comment that you are reading right now!

            int pos = pos1;
            for (int count = line2-line1; count > 0; )
                if (srcFileAsStr.charAt(++pos) == '\n') count--;

            return pos + col2;
        }

        else if (line2 == line1) return pos1 - col1 + col2;

        // This should never happen
        else throw new UnreachableError();
    }


    // ********************************************************************************************
    // ********************************************************************************************
    // Private Clone Constructor
    // ********************************************************************************************
    // ********************************************************************************************


    private Location(Location l)
    {
        this.signatureStartPos  = l.signatureStartPos;
        this.signatureStartLine = l.signatureStartLine;
        this.signatureStartCol  = l.signatureStartCol;
    
        this.signatureEndPos    = l.signatureEndPos;
        this.signatureEndLine   = l.signatureEndLine;
        this.signatureEndCol    = l.signatureEndCol;
    
        this.jdcStartPos        = l.jdcStartPos;
        this.jdcStartLine       = l.jdcStartLine;
        this.jdcStartCol        = l.jdcStartCol;
    
        this.jdcEndPos          = l.jdcEndPos;
        this.jdcEndLine         = l.jdcEndLine;
        this.jdcEndCol          = l.jdcEndCol;
    
        this.bodyStartPos       = l.bodyStartPos;
        this.bodyStartLine      = l.bodyStartLine;
        this.bodyStartCol       = l.bodyStartCol;
    
        this.bodyEndPos         = l.bodyEndPos;
        this.bodyEndLine        = l.bodyEndLine;
        this.bodyEndCol         = l.bodyEndCol;
    }


    // ********************************************************************************************
    // ********************************************************************************************
    // java.lang.Object methods
    // ********************************************************************************************
    // ********************************************************************************************


    /**
     * Standard Java {@code toString()} method
     * @return Returns the contents of this class, as a {@code java.lang.String}
     */
    public String toString()
    {
        return
            "signatureStartPos:  " + signatureStartPos + '\n' +
            "signatureStartLine: " + signatureStartLine + '\n' +
            "signatureStartCol:  " + signatureStartCol + '\n' +
    
            "signatureEndPos:    " + signatureEndPos + '\n' +
            "signatureEndLine:   " + signatureEndLine + '\n' +
            "signatureEndCol:    " + signatureEndCol + '\n' +
    
            "jdcStartPos:        " + jdcStartPos + '\n' +
            "jdcStartLine:       " + jdcStartLine + '\n' +
            "jdcStartCol:        " + jdcStartCol + '\n' +
    
            "jdcEndPos:          " + jdcEndPos + '\n' +
            "jdcEndLine:         " + jdcEndLine + '\n' +
            "jdcEndCol:          " + jdcEndCol + '\n' +
    
            "bodyStartPos:       " + bodyStartPos + '\n' +
            "bodyStartLine:      " + bodyStartLine + '\n' +
            "bodyStartCol:       " + bodyStartCol + '\n' +
    
            "bodyEndPos:         " + bodyEndPos + '\n' +
            "bodyEndLine:        " + bodyEndLine + '\n' +
            "bodyEndCol:         " + bodyEndCol + '\n';
    }

    /**
     * Standard Java {@code clone()} method
     * @return Returns a copy of {@code 'this'} instance
     */
    public Object clone()
    { return new Location(this); }

    /**
     * Standard Java {@code equals()} method
     * 
     * @param other This may be any Java Object, but one that extends class {@code 'Location'}
     * has the potential to result in a {@code TRUE} evaluation from this method.
     * 
     * @return {@code TRUE} if and only if the contents of {@code 'this'} instance are identical to
     * the contents of {@code 'other'} (and only if {@code 'other'} is actually an instance of
     * {@code Location}, or extends at least extends it).
     */
    public boolean equals(Object other)
    {
        if (! Location.class.isAssignableFrom(other.getClass())) return false;

        Location l = (Location) other;

        return
                (this.signatureStartPos     == l.signatureStartPos)
            &&  (this.signatureStartLine    == l.signatureStartLine)
            &&  (this.signatureStartCol     == l.signatureStartCol)
    
            &&  (this.signatureEndPos       == l.signatureEndPos)
            &&  (this.signatureEndLine      == l.signatureEndLine)
            &&  (this.signatureEndCol       == l.signatureEndCol)
    
            &&  (this.jdcStartPos           == l.jdcStartPos)
            &&  (this.jdcStartLine          == l.jdcStartLine)
            &&  (this.jdcStartCol           == l.jdcStartCol)
    
            &&  (this.jdcEndPos             == l.jdcEndPos)
            &&  (this.jdcEndLine            == l.jdcEndLine)
            &&  (this.jdcEndCol             == l.jdcEndCol)
    
            &&  (this.bodyStartPos          == l.bodyStartPos)
            &&  (this.bodyStartLine         == l.bodyStartLine)
            &&  (this.bodyStartCol          == l.bodyStartCol)
    
            &&  (this.bodyEndPos            == l.bodyEndPos)
            &&  (this.bodyEndLine           == l.bodyEndLine)
            &&  (this.bodyEndCol            == l.bodyEndCol);
    }

    /**
     * Simply invokes the {@code hashCode()} static-method provided by class {@code java.lang.Integer}.
     * @return a hash code value for this object.
     */
    public int hashCode()
    { return Integer.hashCode(this.signatureStartPos * this.signatureEndPos); }


    // ********************************************************************************************
    // ********************************************************************************************
    // Specialized toString
    // ********************************************************************************************
    // ********************************************************************************************


    /**
     * Generates a {@code String} - with all information available, including any content requested
     * by the {@code 'flags'} parameter.
     * 
     * @param flags These are the {@code toString(...)} flags from class {@code PF}
     * ("Print Flags"). View available flags listed in class {@link PF}.
     * 
     * @param srcFileAsStr This parameter should contain the complete {@code '.java'} source-code
     * file as a {@code String}.  If you have passed the Print-Flags for requesting that the body
     * or Java-Doc Comment be output to the returned-{@code String}, this parameter must be passed
     * a valid copy of the {@code '.java'} File.
     * 
     * <BR /><BR />This parameter may be null, and if it is it will be ignored.  When null is
     * passed to this parameter, the actual Body, Java-Doc Comment &amp; Signature simply cannot
     * be extracted, and the output of this {@code toString} method shall only print the location
     * numbers, column's and line-numbers instead.
     * 
     * <BR /><BR />If a valid copy of the contents of the {@code '.java'} file that produced
     * {@code 'this'} instance of {@code Location} is passed <B STYLE='color: red;'><I>and</I></B>
     * if the appropriate Print-Flags are passed tot he {@code 'flags'} parameter requesting that
     * the specified-elements (signature, comment and body) be output to the
     * returned-{@code String},  <B STYLE='color: red;'><I>then</I></B> those elements will be 
     * printed to the output-{@code String}.
     * 
     * <BR /><BR /><B>NOTE:</B> If the contents of parameter {@code 'srcFileAsstr'} are not the
     * exact and un-modified contents of the {@code'.java} file that produced {@code 'this'}
     * instance of location, then the {@code String} returned will contain erroneous information.
     * It is even possible that a {@code StringIndexOutOfBoundsException} may be thrown.
     * 
     * @return A printable {@code String} of the locations represented by this instance
     * 
     * @see PF
     * @see StrCSV#toCSV(String[], boolean, boolean, Integer)
     * @see #toString()
     */
    public String toString(int flags, String srcFileAsStr)
    {
        boolean color       = (flags & UNIX_COLORS) > 0;
        boolean src         = srcFileAsStr != null;
        boolean signature   = src;
        boolean bodyShort   = src && ((flags & BODY_SHORT) > 0);
        boolean bodyLong    = (! bodyShort) && src && ((flags & BODY) > 0);
        boolean jdc         = src && ((flags & JAVADOC_COMMENTS) > 0);
        boolean locShort    = (flags & BRIEF_LOCATION) > 0;
        int     M_OVER_2    = MAX_STR_LEN / 2;

        if (locShort) return

            (signature
                ? ("Signature:        " + StrIndent.indentAfter2ndLine
                    (srcFileAsStr.substring(signatureStartPos, signatureEndPos), 4, true, false) +
                    '\n')
                : "") +

            "Signature-Start:  " +
            "pos="  + (color ? BGREEN : "") + signatureStartPos  + (color ? RESET : "") + ", " +
            "line=" + (color ? BGREEN : "") + signatureStartLine + (color ? RESET : "") + ", " +
            "col="  + (color ? BGREEN : "") + signatureStartCol  + (color ? RESET : "") + "\n" +

            "Signature-End:    " +
            "pos="  + (color ? BCYAN : "") + signatureEndPos  + (color ? RESET : "") + ", " +
            "line=" + (color ? BCYAN : "") + signatureEndLine + (color ? RESET : "") + ", " +
            "col="  + (color ? BCYAN : "") + signatureEndCol  + (color ? RESET : "") + "\n" +

            (jdc
                ? ("Java-Doc Comment: " + StrPrint.abbrev(srcFileAsStr.substring
                    (jdcStartPos, jdcEndPos), M_OVER_2, true, null, MAX_STR_LEN) + '\n')
                : "") +

            "Java-Doc-Start:   " +
            "pos="  + (color ? BGREEN : "") + jdcStartPos  + (color ? RESET : "") + ", " +
            "line=" + (color ? BGREEN : "") + jdcStartLine + (color ? RESET : "") + ", " +
            "col="  + (color ? BGREEN : "") + jdcStartCol  + (color ? RESET : "") + "\n" +

            "Java-Doc-End:     " +
            "pos="  + (color ? BCYAN : "") + jdcEndPos  + (color ? RESET : "") + ", " +
            "line=" + (color ? BCYAN : "") + jdcEndLine + (color ? RESET : "") + ", " +
            "col="  + (color ? BCYAN : "") + jdcEndCol  + (color ? RESET : "") + "\n" +

            (bodyShort
                ? ("Body:             " + StrPrint.abbrev(srcFileAsStr.substring
                    (signatureStartPos, signatureEndPos), M_OVER_2, true, null, MAX_STR_LEN))
                : "") +

            (bodyLong
                ? ("Body:             " + StrIndent.indentAfter2ndLine
                    (srcFileAsStr.substring(signatureStartPos, signatureEndPos), 4, true, false))
                : "") +

            "Body-Start:       " +
            "pos="  + (color ? BGREEN : "") + bodyStartPos  + (color ? RESET : "") + ", " +
            "line=" + (color ? BGREEN : "") + bodyStartLine + (color ? RESET : "") + ", " +
            "col="  + (color ? BGREEN : "") + bodyStartCol  + (color ? RESET : "") + "\n" +

            "Body-End:         " +
            "pos="  + (color ? BCYAN : "") + bodyEndPos  + (color ? RESET : "") + ", " +
            "line=" + (color ? BCYAN : "") + bodyEndLine + (color ? RESET : "") + ", " +
            "col="  + (color ? BCYAN : "") + bodyEndCol  + (color ? RESET : "");

        else return

            (signature
                ? ("SIGNATURE: " + StrIndent.indentAfter2ndLine
                    (srcFileAsStr.substring(signatureStartPos, signatureEndPos), 4, true, false))
                : "") +

            "signatureStartPos:  " + (color ? BGREEN : "") + signatureStartPos + '\n' +
                (color ? RESET : "") + 
            "signatureStartLine: " + (color ? BGREEN : "") + signatureStartLine + '\n' +
                (color ? RESET : "") + 
            "signatureStartCol:  " + (color ? BGREEN : "") + signatureStartCol + '\n' +
                (color ? RESET : "") + 
    
            "signatureEndPos:    " + (color ? BCYAN : "") + signatureEndPos + '\n' +
                (color ? RESET : "") + 
            "signatureEndLine:   " + (color ? BCYAN : "") + signatureEndLine + '\n' +
                (color ? RESET : "") + 
            "signatureEndCol:    " + (color ? BCYAN : "") + signatureEndCol + '\n' +
                (color ? RESET : "") + 

            (jdc
                ? ("BODY: " + StrPrint.abbrev(srcFileAsStr.substring
                    (jdcStartPos, jdcEndPos), M_OVER_2, true, null, MAX_STR_LEN))
                : "") +

            "jdcStartPos:        " + (color ? BGREEN : "") + jdcStartPos + '\n' +
                (color ? RESET : "") + 
            "jdcStartLine:       " + (color ? BGREEN : "") + jdcStartLine + '\n' +
                (color ? RESET : "") + 
            "jdcStartCol:        " + (color ? BGREEN : "") + jdcStartCol + '\n' +
                (color ? RESET : "") + 

            "jdcEndPos:          " + (color ? BCYAN : "") + jdcEndPos + '\n' +
                (color ? RESET : "") + 
            "jdcEndLine:         " + (color ? BCYAN : "") + jdcEndLine + '\n' +
                (color ? RESET : "") + 
            "jdcEndCol:          " + (color ? BCYAN : "") + jdcEndCol + '\n' +
                (color ? RESET : "") + 

            (bodyShort
                ? ("BODY: " + StrPrint.abbrev(srcFileAsStr.substring
                    (signatureStartPos, signatureEndPos), M_OVER_2, true, null, MAX_STR_LEN))
                : "") +

            (bodyLong
                ? ("BODY: " + StrIndent.indentAfter2ndLine
                    (srcFileAsStr.substring(signatureStartPos, signatureEndPos), 4, true, false))
                : "") +

            "bodyStartPos:       " + (color ? BGREEN : "") + bodyStartPos +'\n' +
                (color ? RESET : "") + 
            "bodyStartLine:      " + (color ? BGREEN : "") + bodyStartLine + '\n' +
                (color ? RESET : "") +
            "bodyStartCol:       " + (color ? BGREEN : "") + bodyStartCol + '\n' +
                (color ? RESET : "") + 

            "bodyEndPos:         " + (color ? BCYAN : "") + bodyEndPos + '\n' +
                (color ? RESET : "") + 
            "bodyEndLine:        " + (color ? BCYAN : "") + bodyEndLine + '\n' +
                (color ? RESET : "") + 
            "bodyEndCol:         " + (color ? BCYAN : "") + bodyEndCol + '\n' +
                (color ? RESET : "");
    }

    /**
     * Produces a quick-summary, as a {@code String}.
     * @return a very brief summary of the information contained by this class.  Lists only the
     * starting line numbers for the three sections.
     */
    public String quickSummary()
    {
        return "signature-line=" + this.signatureStartLine + ", javadoc-line=" + this.jdcStartLine +
            ", body-line=" + this.bodyStartLine;        
    }


    // ********************************************************************************************
    // ********************************************************************************************
    // Error-Checking
    // ********************************************************************************************
    // ********************************************************************************************


    private void check()
    {

    }


    // ********************************************************************************************
    // ********************************************************************************************
    // Package-Private Debugging Tool for finding where two Declaration instances are different
    // ********************************************************************************************
    // ********************************************************************************************


    // NOTE: This class has a local copy of 'diff' -> since the only diff's that are being done
    //       here are for integers.

    void diff(Location other, Appendable a, String indentation) throws IOException
    {
        diff(this.signatureStartPos, other.signatureStartPos, "signatureStartPos", a, indentation);

        diff(
            this.signatureStartLine, other.signatureStartLine, "signatureStartLine", a,
            indentation
        );

        diff(this.signatureStartCol, other.signatureStartCol, "signatureStartCol", a, indentation);

        diff(this.signatureEndPos, other.signatureEndPos, "signatureEndPos", a, indentation);
        diff(this.signatureEndLine, other.signatureEndLine, "signatureEndLine", a, indentation);
        diff(this.signatureEndCol, other.signatureEndCol, "signatureEndCol", a, indentation);

        diff(this.jdcStartPos, other.jdcStartPos, "jdcStartPos", a, indentation);
        diff(this.jdcStartLine, other.jdcStartLine, "jdcStartLine", a, indentation);
        diff(this.jdcStartCol, other.jdcStartCol, "jdcStartCol", a, indentation);

        diff(this.jdcEndPos, other.jdcEndPos, "jdcEndPos", a, indentation);
        diff(this.jdcEndLine, other.jdcEndLine, "jdcEndLine", a, indentation);
        diff(this.jdcEndCol, other.jdcEndCol, "jdcEndCol", a, indentation);

        diff(this.bodyStartPos, other.bodyStartPos, "bodyStartPos", a, indentation);
        diff(this.bodyStartLine, other.bodyStartLine, "bodyStartLine", a, indentation);
        diff(this.bodyStartCol, other.bodyStartCol, "bodyStartCol", a, indentation);

        diff(this.bodyEndPos, other.bodyEndPos, "bodyEndPos", a, indentation);
        diff(this.bodyEndLine, other.bodyEndLine, "bodyEndLine", a, indentation);
        diff(this.bodyEndCol, other.bodyEndCol, "bodyEndCol", a, indentation);
    }

    private void diff(int int1, int int2, String intName, Appendable a, String indentation)
        throws IOException
    {
        if (int2 != int1) a.append(
            indentation +
            "this.location." + intName + ": [" + BGREEN + ("" + int1) + RESET + "], " +
            "other.location." + intName + ": [" + BGREEN + ("" + int2) + RESET + "]\n"
        );
    }
}