Fastring alternatives and similar packages
Based on the "Tools" category.
Alternatively, view Fastring alternatives based on common mentions on social networks and blogs.
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Gitbucket
A Git platform powered by Scala with easy installation, high extensibility & GitHub API compatibility -
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bloop
Bloop is a build server and CLI tool to compile, test and run Scala fast from any editor or build tool. -
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Scurses
Scurses, terminal drawing API for Scala, and Onions, a Scurses framework for easy terminal UI -
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dregrex
dregex is a Java library that implements a regular expression engine using deterministic finite automata (DFA). It supports some Perl-style features and yet retains linear matching time, and also offers set operations. -
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pos
Macro based print debugging for Scala code. Locates debug statements in your IDE. Supports logging.
WorkOS - The modern identity platform for B2B SaaS
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README
Fastring
Fastring is a string formatting library for Scala.
Fastring is also designed to be a template engine,
and it is an excellent replacement of JSP, Scalate or FreeMarker.
It's simple to use
Fastring uses string interpolation syntax.
For example, if you are writing a CGI page:
import com.dongxiguo.fastring.Fastring.Implicits._
def printHtml(link: java.net.URL) {
val fastHtml = fast"<html><body><a href='$link'>Click Me!</a></body></html>"
print(fastHtml)
}
It's extremely fast
I made a benchmark. I used 4 different ways to create a 545-characters string.
- Fastring (
fast"Concat with $something"syntax); - String concatenation (
s"Concat with $something"syntax); - Handwritten
StringBuilder(stringBuilder ++= "Build from " ++= somethingsyntax); java.util.Formatter(f"Format with $something"syntax).
This is the result from my Intel i5-3450 computer:
Fastring import com.dongxiguo.fastring.Fastring.Implicits._ def fast(a: Int) = fast"head ${ (for (j <- 0 until 10 view) yield { fast"baz$j $a foo ${ (for (i <- 0 until 4 view) yield { fast"$a i=$i" }).mkFastring(",") } bar\n" }).mkFastring("<hr/>") } tail"
fast(0).toString Took 669 nanoseconds to generate a 545-characters string.(Simple and fast) String concatenation def s(a: Int) = s"head ${ (for (j <- 0 until 10 view) yield { s"baz$j $a foo ${ (for (i <- 0 until 4 view) yield { s"$a i=$i" }).mkString(",") } bar\n" }).mkString("<hr/>") } tail"
s(0) Took 1738 nanoseconds to generate a 545-characters string.(Simple but slow) Handwritten StringBuilder def sb(sb: StringBuilder, a: Int) { sb ++= "head " var first = true for (j <- 0 until 10 view) { if (first) { first = false } else { sb ++= ""<hr/>"" } sb ++= "baz" ++= j.toString ++= " " ++= a.toString ++= " foo "; { var first = true for (i <- 0 until 4 view) { if (first) { first = false } else { sb ++= "," } sb ++= a.toString sb ++= " i=" sb ++= i.toString } } sb ++= " bar\n" } sb ++= " tail" sb }
val s = new StringBuilder sb(s, 0) s.toString Took 537 nanoseconds to generate a 545-characters string.(Fast but too trivial) java.util.Formatter def f(a: Int) = f"head ${ (for (j <- 0 until 10 view) yield { f"baz$j $a foo ${ (for (i <- 0 until 4 view) yield { f"$a i=$i" }).mkString(",") } bar\n" }).mkString("<hr/>") } tail"
f(0) Took 7436 nanoseconds to generate a 545-characters string.(Simple but extremely slow)
Fastring is so fast because it is lazily evaluated.
It avoids coping content for nested String Interpolation.
Thus, Fastring is very suitable to generate complex text content(e.g. HTML, JSON).
For example, in the previous benchmark for Fastring, the most of time was spent on invoking toString.
You can avoid these overhead if you do not need a whole string. For example:
// Faster than: print(fast"My lazy string from $something")
fast"My lazy string from $something".foreach(print)
You can invoke foreach because Fastring is just a Traversable[String].
Utilities
There is a mkFastring method for Seq:
// Enable mkFastring method
import com.dongxiguo.fastring.Fastring.Implicits._
// Got Fastring("Seq.mkFastring: Hello, world")
fast"Seq.mkFastring: ${Seq("Hello", "world").mkFastring(", ")}"
// Also works, but slower:
// Got Fastring("Seq.mkString: Hello, world")
fast"Seq.mkString: ${Seq("Hello", "world").mkString(", ")}"
And a leftPad method for Byte, Short, Int and Long:
// Enable leftPad method
import com.dongxiguo.fastring.Fastring.Implicits._
// Got Fastring("Int.leftPad: 123")
fast"Int.leftPad: ${123.leftPad(5)}"
// Got Fastring("Int.leftPad: 00123")
fast"Int.leftPad: ${123.leftPad(5, '0')}"
Installation
Put these lines in your build.sbt if you use Sbt:
libraryDependencies += "com.dongxiguo" %% "fastring" % "latest.release"
See http://mvnrepository.com/artifact/com.dongxiguo/fastring_2.12 if you use Maven or other build systems.
Note that Fastring requires Scala 2.10, 2.11 or 2.12.