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Add an optional parameter to joinToString() and joinTo() functions: lambda function which maps the element to string.

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#KT-5468 Fixed
This commit is contained in:
Ilya Gorbunov
2015-04-21 20:54:30 +03:00
parent c8a76f6344
commit d531d7130f
5 changed files with 67 additions and 53 deletions
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libraries/tools/kotlin-stdlib-gen/src/templates/Strings.kt
+5 -5
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@@ -5,7 +5,7 @@ import templates.Family.*
fun strings(): List<GenericFunction> {
val templates = arrayListOf<GenericFunction>()
templates add f("joinTo(buffer: A, separator: String = \", \", prefix: String = \"\", postfix: String = \"\", limit: Int = -1, truncated: String = \"...\")") {
templates add f("joinTo(buffer: A, separator: String = \", \", prefix: String = \"\", postfix: String = \"\", limit: Int = -1, truncated: String = \"...\", transform: ((T) -> String)? = null)") {
doc {
"""
Appends the string from all the elements separated using [separator] and using the given [prefix] and [postfix] if supplied.
@@ -23,7 +23,7 @@ fun strings(): List<GenericFunction> {
for (element in this) {
if (++count > 1) buffer.append(separator)
if (limit < 0 || count <= limit) {
val text = if (element == null) "null" else element.toString()
val text = if (transform != null) transform(element) else if (element == null) "null" else element.toString()
buffer.append(text)
} else break
}
@@ -40,7 +40,7 @@ fun strings(): List<GenericFunction> {
for (element in this) {
if (++count > 1) buffer.append(separator)
if (limit < 0 || count <= limit) {
val text = element.toString()
val text = if (transform != null) transform(element) else element.toString()
buffer.append(text)
} else break
}
@@ -51,7 +51,7 @@ fun strings(): List<GenericFunction> {
}
}
templates add f("joinToString(separator: String = \", \", prefix: String = \"\", postfix: String = \"\", limit: Int = -1, truncated: String = \"...\")") {
templates add f("joinToString(separator: String = \", \", prefix: String = \"\", postfix: String = \"\", limit: Int = -1, truncated: String = \"...\", transform: ((T) -> String)? = null)") {
doc {
"""
Creates a string from all the elements separated using [separator] and using the given [prefix] and [postfix] if supplied.
@@ -65,7 +65,7 @@ fun strings(): List<GenericFunction> {
returns("String")
body {
"""
return joinTo(StringBuilder(), separator, prefix, postfix, limit, truncated).toString()
return joinTo(StringBuilder(), separator, prefix, postfix, limit, truncated, transform).toString()
"""
}
}