/
Filtering.kt
268 lines (236 loc) · 7.48 KB
/
Filtering.kt
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package templates
import templates.Family.*
fun filtering(): List<GenericFunction> {
val templates = arrayListOf<GenericFunction>()
templates add f("drop(n: Int)") {
doc { "Returns a list containing all elements except first *n* elements" }
returns("List<T>")
body {
"""
var count = 0
val list = ArrayList<T>()
for (item in this) {
if (count++ >= n) list.add(item)
}
return list
"""
}
doc(Streams) { "Returns a stream containing all elements except first *n* elements" }
returns(Streams) { "Stream<T>" }
body(Streams) {
"""
var count = 0;
return FilteringStream(this) { count++ >= n }
"""
}
include(Collections)
body(Collections, ArraysOfObjects, ArraysOfPrimitives) {
"""
if (n >= size)
return ArrayList<T>()
var count = 0
val list = ArrayList<T>(size - n)
for (item in this) {
if (count++ >= n) list.add(item)
}
return list
"""
}
}
templates add f("take(n: Int)") {
doc { "Returns a list containing first *n* elements" }
returns("List<T>")
body {
"""
var count = 0
val list = ArrayList<T>(n)
for (item in this) {
if (count++ >= n)
break
list.add(item)
}
return list
"""
}
doc(Streams) { "Returns a stream containing first *n* elements" }
returns(Streams) { "Stream<T>" }
body(Streams) {
"""
var count = 0
return LimitedStream(this) { count++ == n }
"""
}
include(Collections)
body(Collections, ArraysOfObjects, ArraysOfPrimitives) {
"""
var count = 0
val realN = if (n > size) size else n
val list = ArrayList<T>(realN)
for (item in this) {
if (count++ == realN)
break;
list.add(item)
}
return list
"""
}
}
templates add f("dropWhile(predicate: (T)->Boolean)") {
inline(true)
doc { "Returns a list containing all elements except first elements that satisfy the given *predicate*" }
returns("List<T>")
body {
"""
var yielding = false
val list = ArrayList<T>()
for (item in this)
if (yielding)
list.add(item)
else if(!predicate(item)) {
list.add(item)
yielding = true
}
return list
"""
}
inline(false, Streams)
doc(Streams) { "Returns a stream containing all elements except first elements that satisfy the given *predicate*" }
returns(Streams) { "Stream<T>" }
body(Streams) {
"""
var yielding = false
return FilteringStream(this) {
if (yielding)
true
else if (!predicate(it)) {
yielding = true
true
} else
false
}
"""
}
}
templates add f("takeWhile(predicate: (T)->Boolean)") {
inline(true)
doc { "Returns a list containing first elements satisfying the given *predicate*" }
returns("List<T>")
body {
"""
val list = ArrayList<T>()
for (item in this) {
if(!predicate(item))
break;
list.add(item)
}
return list
"""
}
inline(false, Streams)
doc(Streams) { "Returns a stream containing first elements satisfying the given *predicate*" }
returns(Streams) { "Stream<T>" }
body(Streams) {
"""
return LimitedStream(this, false, predicate)
"""
}
}
templates add f("filter(predicate: (T)->Boolean)") {
inline(true)
doc { "Returns a list containing all elements matching the given *predicate*" }
returns("List<T>")
body {
"""
return filterTo(ArrayList<T>(), predicate)
"""
}
inline(false, Streams)
doc(Streams) { "Returns a stream containing all elements matching the given *predicate*" }
returns(Streams) { "Stream<T>" }
body(Streams) {
"""
return FilteringStream(this, true, predicate)
"""
}
include(Maps)
}
templates add f("filterTo(collection: C, predicate: (T) -> Boolean)") {
inline(true)
doc { "Appends all elements matching the given *predicate* into the given *collection*" }
typeParam("C: MutableCollection<in T>")
returns("C")
body {
"""
for (element in this) if (predicate(element)) collection.add(element)
return collection
"""
}
include(Maps)
}
templates add f("filterNot(predicate: (T)->Boolean)") {
inline(true)
doc { "Returns a list containing all elements not matching the given *predicate*" }
returns("List<T>")
body {
"""
return filterNotTo(ArrayList<T>(), predicate)
"""
}
inline(false, Streams)
doc(Streams) { "Returns a stream containing all elements not matching the given *predicate*" }
returns(Streams) { "Stream<T>" }
body(Streams) {
"""
return FilteringStream(this, false, predicate)
"""
}
include(Maps)
}
templates add f("filterNotTo(collection: C, predicate: (T) -> Boolean)") {
inline(true)
doc { "Appends all elements not matching the given *predicate* to the given *collection*" }
typeParam("C: MutableCollection<in T>")
returns("C")
body {
"""
for (element in this) if (!predicate(element)) collection.add(element)
return collection
"""
}
include(Maps)
}
templates add f("filterNotNull()") {
exclude(ArraysOfPrimitives)
doc { "Returns a list containing all elements that are not null" }
typeParam("T: Any")
returns("List<T>")
toNullableT = true
body {
"""
return filterNotNullTo(ArrayList<T>())
"""
}
doc(Streams) { "Returns a stream containing all elements that are not null" }
returns(Streams) { "Stream<T>" }
body(Streams) {
"""
return FilteringStream(this, false, { it != null }) as Stream<T>
"""
}
}
templates add f("filterNotNullTo(collection: C)") {
exclude(ArraysOfPrimitives)
doc { "Appends all elements that are not null to the given *collection*" }
typeParam("C: MutableCollection<in T>")
typeParam("T: Any")
returns("C")
toNullableT = true
body {
"""
for (element in this) if (element != null) collection.add(element)
return collection
"""
}
}
return templates
}