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Painless Spec Documentation Clean Up (#29441) Created a flatter structure for the different sections. Cleaned up comments, keywords, and literals. Used callouts for examples where it made sense.
2018-04-17 15:16:08 -04:00
[[painless-lang-spec]]
[DOCS] Setting up separate Painless book.
2017-05-12 19:17:06 -04:00
== Painless Language Specification
Painless Spec Documentation Clean Up (#29441) Created a flatter structure for the different sections. Cleaned up comments, keywords, and literals. Used callouts for examples where it made sense.
2018-04-17 15:16:08 -04:00
Painless is a scripting language designed for security and performance.
Painless syntax is similar to Java syntax along with some additional
features such as dynamic typing, Map and List accessor shortcuts, and array
initializers. As a direct comparison to Java, there are some important
differences, especially related to the casting model. For more detailed
Painless: Types Section Clean Up (#30283) Clean up of types section, casting section, and a large number of examples.
2018-05-23 16:36:58 -04:00
conceptual information about the basic constructs that Painless and Java share,
[DOCS] Setting up separate Painless book.
2017-05-12 19:17:06 -04:00
refer to the corresponding topics in the
https://docs.oracle.com/javase/specs/jls/se8/html/index.html[Java Language
Specification].
[DOCS] http -> https, remove outdated plugin docs (#60380) (#60545) Plugin discovery documentation contained information about installing Elasticsearch 2.0 and installing an oracle JDK, both of which is no longer valid. While noticing that the instructions used cleartext HTTP to install packages, this commit replaces HTTPs links instead of HTTP where possible. In addition a few community links have been removed, as they do not seem to exist anymore. Co-authored-by: Alexander Reelsen <alexander@reelsen.net>
2020-07-31 16:16:31 -04:00
Painless scripts are parsed and compiled using the https://www.antlr.org/[ANTLR4]
and https://asm.ow2.org/[ASM] libraries. Scripts are compiled directly
Painless Spec Documentation Clean Up (#29441) Created a flatter structure for the different sections. Cleaned up comments, keywords, and literals. Used callouts for examples where it made sense.
2018-04-17 15:16:08 -04:00
into Java Virtual Machine (JVM) byte code and executed against a standard JVM.
This specification uses ANTLR4 grammar notation to describe the allowed syntax.
[DOCS] Setting up separate Painless book.
2017-05-12 19:17:06 -04:00
However, the actual Painless grammar is more compact than what is shown here.
[DOCS] http -> https, remove outdated plugin docs (#60380) (#60545) Plugin discovery documentation contained information about installing Elasticsearch 2.0 and installing an oracle JDK, both of which is no longer valid. While noticing that the instructions used cleartext HTTP to install packages, this commit replaces HTTPs links instead of HTTP where possible. In addition a few community links have been removed, as they do not seem to exist anymore. Co-authored-by: Alexander Reelsen <alexander@reelsen.net>
2020-07-31 16:16:31 -04:00
include::painless-lang-spec/index.asciidoc[]