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IntelliJ-AceJump/src/main/kotlin/org/acejump/boundaries/Boundaries.kt

45 lines
1.8 KiB
Kotlin

package org.acejump.boundaries
import com.intellij.openapi.editor.Editor
import kotlin.math.max
import kotlin.math.min
/**
* Defines a (possibly) disjoint set of editor offsets that partitions
* the whole editor into two groups - offsets inside the range, and
* offsets outside the range.
*/
interface Boundaries {
/**
* Returns a range of editor offsets, starting at the first offset in the
* boundary, and ending at the last offset in the boundary. May include
* offsets outside the boundary, for ex. when the boundary is rectangular
* and the file has long lines which are only partially visible.
*/
fun getOffsetRange(editor: Editor, cache: EditorOffsetCache = EditorOffsetCache.Uncached): IntRange =
StandardBoundaries.VISIBLE_ON_SCREEN.getOffsetRange(editor, cache)
/**
* Returns whether the editor offset is included within the boundary.
*/
fun isOffsetInside(editor: Editor, offset: Int, cache: EditorOffsetCache = EditorOffsetCache.Uncached): Boolean =
StandardBoundaries.VISIBLE_ON_SCREEN.isOffsetInside(editor, offset, cache)
/**
* Creates a boundary so that an offset/range is within the boundary
* iff it is within both original boundaries.
*/
fun intersection(other: Boundaries): Boundaries =
if (this === other) this
else object: Boundaries {
override fun getOffsetRange(editor: Editor, cache: EditorOffsetCache): IntRange {
val b1 = this@Boundaries.getOffsetRange(editor, cache)
val b2 = other.getOffsetRange(editor, cache)
return max(b1.first, b2.first)..min(b1.last, b2.last)
}
override fun isOffsetInside(editor: Editor, offset: Int, cache: EditorOffsetCache): Boolean =
this@Boundaries.isOffsetInside(editor, offset, cache) && other.isOffsetInside(editor, offset, cache)
}
}