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| Support for compare and merge viewers which show the |
| content side-by-side. |
| <h2> |
| Package Specification</h2> |
| |
| The <b>ContentMergeViewer</b> is an abstract compare and merge viewer |
| with two side-by-side content areas and an optional content area for a |
| common ancestor (for three-way compare). Because the implementation makes |
| no assumptions about the content type it is a subclass responsibility to |
| deal with a specific type. Its subclass <b>ImageMergeViewer</b> in |
| package org.eclipse.compare.internal shows how to base a simple |
| mergeviewer for images on <b>ContentMergeViewer</b>. |
| <p> |
| |
| A <b>ContentMergeViewer</b> accesses its model by means of a content |
| provider which must implement the <b>IMergeViewerContentProvider</b> interface. |
| <p> |
| |
| The <b>TextMergeViewer</b> is the standard concrete subclass of |
| <b>ContentMergeViewer</b> for comparing and merging text content. |
| <br> |
| A text merge viewer uses the <b>org.eclipse.compare.rangedifferencer.RangeDifferencer</b> |
| to perform a textual, line-by-line comparison of two (or three) input documents. |
| For text lines that differ the <b>TextMergeViewer</b> uses an <b>ITokenComparator</b> |
| to find longest sequences of matching and non-matching tokens. |
| The <b>TextMergeViewer</b>'s |
| default token compare works on characters separated by whitespace. If a |
| different strategy is needed (for example, Java tokens in a Java-aware |
| merge viewer), clients can create their own token comparators by implementing |
| the <b>ITokenComparator</b> interface. |
| <p>The <b>TextMergeViewer</b> not only works on whole documents but on |
| subranges of documents too. In this case the viewer's input must be an |
| <b>IDocumentRange</b> instead of an <b>IDocument</b>. |
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