org.jeditor.diff

Class DiffPrint.Base

java.lang.Object

org.jeditor.diff.DiffPrint.Base

Direct Known Subclasses:

DiffPrint.EdPrint, DiffPrint.NormalPrint

Enclosing class:

DiffPrint

public abstract static class DiffPrint.Base
extends java.lang.Object

A Base class for printing edit scripts produced by the Diff class. This class divides the change list into "hunks", and calls printHunk(org.jeditor.diff.Diff.change) for each hunk. Various utility methods are provided as well.

Field Summary

Fields

Modifier and Type	Field and Description
protected int	deletes
protected java.lang.Object[]	file0 Set to the lines of the files being compared.
protected java.lang.Object[]	file1 Set to the lines of the files being compared.
protected int	first0
protected int	first1
protected UnaryPredicate	ignore Set to ignore certain kinds of lines when printing an edit script.
protected int	inserts
protected int	last0
protected int	last1
protected java.io.PrintWriter	outfile

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Base(java.lang.Object[] a, java.lang.Object[] b)

Method Summary

Modifier and Type	Method and Description
protected void	analyzeHunk(Diff.change hunk) Look at a hunk of edit script and report the range of lines in each file that it applies to.
static char	changeLetter(int inserts, int deletes)
protected Diff.change	hunkfun(Diff.change hunk) Called with the tail of the script and returns the last link that belongs together with the start of the tail.
protected abstract void	printHunk(Diff.change hunk)
protected void	printNumberRange(char sepchar, int a, int b) Print a pair of line numbers with sepchar, translated for file FILE.
protected void	printOneLine(java.lang.String pre, java.lang.Object linbuf)
void	printScript(Diff.change script) Divide a script into pieces by calling hunkfun(org.jeditor.diff.Diff.change) and print each piece with printHunk(org.jeditor.diff.Diff.change).

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ignore

protected UnaryPredicate ignore

Set to ignore certain kinds of lines when printing an edit script. For example, ignoring blank lines or comments.

file0

protected java.lang.Object[] file0

Set to the lines of the files being compared.

file1

protected java.lang.Object[] file1

Set to the lines of the files being compared.

first0

protected int first0

last0

protected int last0

first1

protected int first1

last1

protected int last1

deletes

protected int deletes

inserts

protected int inserts

outfile

protected java.io.PrintWriter outfile

Constructor Detail

Base

protected Base(java.lang.Object[] a,
               java.lang.Object[] b)

Method Detail

printScript

public void printScript(Diff.change script)

Divide a script into pieces by calling hunkfun(org.jeditor.diff.Diff.change) and print each piece with printHunk(org.jeditor.diff.Diff.change). Both functions take one arg, an edit script. printHunk(org.jeditor.diff.Diff.change) takes a subscript which belongs together (with a null link at the end) and prints it.

Parameters:

script - the change script

hunkfun

protected Diff.change hunkfun(Diff.change hunk)

Called with the tail of the script and returns the last link that belongs together with the start of the tail.

Parameters:

hunk - the hunk

Returns:

the change

analyzeHunk

protected void analyzeHunk(Diff.change hunk)

Look at a hunk of edit script and report the range of lines in each file that it applies to. hunk is the start of the hunk, which is a chain of `struct change'. The first and last line numbers of file0 are stored in first0 and last0, and likewise for file1 in first1 and last1. Note that these are internal line numbers that count from 0. If no lines from file 0 are deleted, then first0 is last0 + 1. Also set deletes nonzero if any lines of file0 are deleted and set inserts nonzero if any lines of file 1 are inserted. If only ignorable lines are inserted or deleted, both are set to 0.

Parameters:

hunk - the start of the hunk

printHunk

protected abstract void printHunk(Diff.change hunk)

printOneLine

protected void printOneLine(java.lang.String pre,
                            java.lang.Object linbuf)

printNumberRange

protected void printNumberRange(char sepchar,
                                int a,
                                int b)

Print a pair of line numbers with sepchar, translated for file FILE. If the two numbers are identical, print just one number. We print the translated (real) line numbers.

Parameters:

sepchar - the character separator

a - the first line number

b - the second line number

changeLetter

public static char changeLetter(int inserts,
                                int deletes)