Scala Parser Combinators
jsoniter-scala
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Scala Parser Combinators | jsoniter-scala | |
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3 | 29 | |
641 | 704 | |
0.5% | - | |
6.9 | 9.6 | |
2 days ago | 2 days ago | |
Scala | Scala | |
Apache License 2.0 | MIT License |
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Scala Parser Combinators
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Best way to port a scala + swing app to flutter?
Scala used to include a parser combinator library. I don't know whether it comes with a Scala grammar as an example but I'd probably take a day and experiment whether it would be possible to create an AST parser for the Scala grammar.
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thoroughful tutorial for scala.util.parsing.combinator._
If you find anything that isn't already linked from the README at https://github.com/scala/scala-parser-combinators , please PR the addition to the readme.
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-🎄- 2021 Day 18 Solutions -🎄-
Mostly a mess of pattern matching. I really need to make some generic tree utilities. Haven't been able to find a decent parser combinator that works in Scala 3 (I usually use fastparse which depends heavily on Scala 2 macros, and scala-parser-combinators works in Scala 3, but I've had a lot of trouble getting it to not be too greedy), so I used the state monad from cats to parse at the bottom of the file, which I think turned out fairly nice.
jsoniter-scala
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1BRC Merykitty's Magic SWAR: 8 Lines of Code Explained in 3k Words
What an amazing step by step explanation!
More than 2 years ago I found that byte array view var handles are quite suitable to cook efficient SWAR routines with Java/Scala.
See a lot of other examples of SWAR usage, like parsing Base16/64 string, java.time.* and number values directly from byte arrays:
https://github.com/plokhotnyuk/jsoniter-scala/blob/master/js...
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The Newest Java Json Benchmark Results just dropped
Afaik dsl-json came up with a lot of improvements and inspired a several other libraries like JsonIter and jsonIter-scala. Jsoniter-scala by u/plokhotnyuk is probably the most optimized JSON library on the JVM at this point, and seems to power most of the Scala ecosystem. Some implementations/optimizations eventually made their way back into Jackson and other libraries.
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Please try my JSON library
I was on your place more then 5 years ago, when cut the 1st release of jsoniter-scala.
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Post your problems with Scala 3/2.13 compiler performance!
I've just increased compiler performance in ~1.5x times by adding these JVM options for the code cache
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smithy-translate : a CLI tool to turn openapi specs and json-schema specs into smithy specs, written in Scala
We have our own open-source code-generator that produces Scala code from Smithy. The code module is entirely dependency-free, and the generated code is not biased towards any library, be that http or json. We do however have out-of-the-box integration with jsoniter and http4s.
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Why does Scala seem to be slow at benchmark results?
You can use jsoniter-scala. It is easy to use like upickle.
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Scala needs *highly* efficient libraries to survive in a multi-core age
BTW, jsoniter-scala uses it for faster parsing and serialization using SWAR techniques, like here.
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Using Circe with GADT
Probably you should have both codecs (for Foo and for its T) are implicitly available in the scope, like it is done in the following test for jsoniter-scala:
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Starting with scala
BEWARE: uJson is vulnerable under DoS attacks
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Is Scala a good choice for a data intensive web backend?
Please see sources (and GitHub history of development) of jsoniter-scala as an example in the domain of JSON parsing and serialization.
What are some alternatives?
Fast Parse - Writing Fast Parsers Fast in Scala
circe - Yet another JSON library for Scala
Scopt - command line options parsing for Scala
json4s - JSON library
Parboiled2 - A macro-based PEG parser generator for Scala 2.10+
DSL-JSON - High performance JVM JSON library
Scallop - a simple Scala CLI parsing library
jackson-module-scala - Add-on module for Jackson (https://github.com/FasterXML/jackson) to support Scala-specific datatypes
atto - friendly little parsers
Play JSON - The Play JSON library
decline - A composable command-line parser for Scala.
spray-json - A lightweight, clean and simple JSON implementation in Scala