jsx

JVM	Platform	Status
OpenJDK (Temurin) Current	Linux
OpenJDK (Temurin) LTS	Linux
OpenJDK (Temurin) Current	Windows
OpenJDK (Temurin) LTS	Windows

jsx

A general-purpose, configurable S-expression parser.

Features

• Hand-coded lexer and parser with full support for tokens using characters outside of the Unicode BMP.
• Optional square brackets [f (g [x y])].
• Optional multi-line strings.
• Configurable comment characters (#, %, or ;).
• Configurable pretty printing of expressions.
• High coverage test suite.
• OSGi-ready
• JPMS-ready
• ISC license.

Documentation

See the user manual.

Usage

Parsing

Give the configuration for the lexer:

var squareBrackets = true;
var newlinesInQuotedStrings = true;
var startAtLine = 1;
final var lexConfiguration =
  new JSXLexerConfiguration(
    squareBrackets,
    newlinesInQuotedStrings,
    Optional.of(URI.create("file.txt")),
    EnumSet.noneOf(JSXLexerComment.class),
    startAtLine
  );

Instantiate a parser using a parser and lexer configuration:

var preserveLexicalInfo = true;
final var parserConfig =
  new JSXParserConfiguration(preserveLexicalInfo);
final JSXParserSupplierType parsers =
  new JSXParserSupplier();
final var parser =
  parsers.createFromStreamUTF8(
    parserConfig,
    lexConfiguration,
    lexers,
    System.in
  );

Parse expressions:

final var exprOpt = parser.parseExpressionOrEOF();
if (exprOpt.isPresent()) {
  final var e = exprOpt.get();
  System.out.println(e);
}