langur

Langur is an open-source imperative/functional scripting language written by Anthony Davis. Its principles of design are sensibility to humans, accuracy in calculation, and a clean, expressive syntax.

The following is a partial list of langur's features.

• highly expressive “given” expressions (langur's “switch”)
• semi-integrated regex
• decimal floating point for numbers
• optional basex notation, such as -16xFF or 2x1010_0010
• automated for loop over an array or string, or over a range
• first-order functions
• immutable or mutable declarations
• indexing strings by code point
• indexing by arrays
• exponent and root operators
• optional database operators
• catching exceptions without explicit try blocks
• useful built-in functions such as map(), fold(), foldfrom(), where(), group()
• a read() function that validates input

I initially developed langur using Thorsten Ball's books (1, 2), with many changes made and features added.

Source code examples can be found on RosettaCode.org.

download

Try it and let me know what you think. Constructive feeback is welcome.

langur 0.4.9 beta source code (7-Zip, 107K, released August 18, 2019)

Langur uses the Apache license 2.0.

A full revision history is included in the download.

2019-08-18 - 0.4.9 beta - added ability to assign to indexed values of arrays and hashes - fixed broken accounting of line numbers (for error reporting) when multi-line string literals are used - improvements to catching parsing and compilation errors - variable parsing improvements - added Copy() method to each Object type