Tag (Swim System)

java.lang.Object
- swim.codec.Tag

All Implemented Interfaces:

Debug, Display

Direct Known Subclasses:

Mark, Span
```
public abstract class Tag
extends Object
implements Display, Debug
```
Description of a source location. Tags are used to annotate input sources, particularly for diagnostic purposes. A Mark tag annotates a source position. A Span tag annotate a source range.

See Also:

Diagnostic

Constructor Summary

Constructors
Constructor Description

Tag()

Method Summary

Modifier and Type	Method	Description
`abstract Mark`	`end()`	Returns the last source position covered by this `Tag`.
`abstract Tag`	`shift(Mark mark)`	Returns the position of this `Tag` relative to the given `mark`.
`abstract Mark`	`start()`	Returns the first source position covered by this `Tag`.
`abstract Tag`	`union(Tag other)`	Returns a `Tag` that includes all source locations covered by both this tag, and some `other` tag.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface swim.codec.Debug
debug

Methods inherited from interface swim.codec.Display
display

- Constructor Detail
  - Tag
```
public Tag()
```
- Method Detail
  - start
```
public abstract Mark start()
```
    Returns the first source position covered by this Tag.
  - end
```
public abstract Mark end()
```
    Returns the last source position covered by this Tag.
  - union
```
public abstract Tag union(Tag other)
```
    Returns a Tag that includes all source locations covered by both this tag, and some other tag.
  - shift
```
public abstract Tag shift(Mark mark)
```
    Returns the position of this Tag relative to the given mark.