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Sensible behavior for File.startsWith and File.endsWith

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This commit is contained in:
Ilya Gorbunov
2015-12-10 07:06:54 +03:00
parent d2e22dc794
commit a4f82a2dc4
2 changed files with 19 additions and 14 deletions
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libraries/stdlib/src/kotlin/io/files/Utils.kt
+8 -9
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@@ -379,14 +379,13 @@ public fun File.listFiles(filter: (file: File) -> Boolean): Array<File>? = listF
* Determines whether this file belongs to the same root as [other]
* and starts with all components of [other] in the same order.
* So if [other] has N components, first N components of `this` must be the same as in [other].
* For relative [other], `this` can belong to any root.
*
* @return `true` if this path starts with [other] path, `false` otherwise.
*/
public fun File.startsWith(other: File): Boolean {
val components = toComponents()
val otherComponents = other.toComponents()
if (components.root != otherComponents.root && otherComponents.rootName != "")
if (components.root != otherComponents.root)
return false
return if (components.size < otherComponents.size) false
else components.segments.subList(0, otherComponents.size).equals(otherComponents.segments)
@@ -396,25 +395,25 @@ public fun File.startsWith(other: File): Boolean {
* Determines whether this file belongs to the same root as [other]
* and starts with all components of [other] in the same order.
* So if [other] has N components, first N components of `this` must be the same as in [other].
* For relative [other], `this` can belong to any root.
*
* @return `true` if this path starts with [other] path, `false` otherwise.
*/
public fun File.startsWith(other: String): Boolean = startsWith(File(other))
/**
* Determines whether this file belongs to the same root as [other]
* and ends with all components of [other] in the same order.
* So if [other] has N components, last N components of `this` must be the same as in [other].
* For relative [other], `this` can belong to any root.
* Determines whether this file path ends with the path of [other] file.
*
* If [other] is rooted path it must be equal to this.
* If [other] is relative path then last N components of `this` must be the same as all components in [other],
* where N is the number of components in [other].
*
* @return `true` if this path ends with [other] path, `false` otherwise.
*/
public fun File.endsWith(other: File): Boolean {
val components = toComponents()
val otherComponents = other.toComponents()
if (components.root != otherComponents.root && otherComponents.rootName != "")
return false
if (otherComponents.isRooted)
return this == other
val shift = components.size - otherComponents.size
return if (shift < 0) false
else components.segments.subList(shift, components.size).equals(otherComponents.segments)