bare-script 0.9.3

bare-script

BareScript is a light-weight scripting and expression language.

Links

• The BareScript Language

• The BareScript Library

• The BareScript Expression Library

• API Documentation

• Source code

Executing BareScript

To execute a BareScript script, parse the script using the parse_script function. Then execute the script using the execute_script function. For example:

>>> from bare_script import execute_script, parse_script
...
>>> # Parse the script
... script = parse_script('''\
... # Double a number
... function double(n):
...     return n * 2
... endfunction
...
... return N + ' times 2 is ' + double(N)
... ''')
...
>>> # Execute the script
... globals = {'N': 10}
>>> print(execute_script(script, {'globals': globals}))
10 times 2 is 20

The BareScript Library

The BareScript Library includes a set of built-in functions for mathematical operations, object manipulation, array manipulation, regular expressions, HTTP fetch and more. The following example demonstrates the use of the systemFetch, objectGet, and arrayLength functions.

>>> import urllib.request
...
>>> from bare_script import execute_script, fetch_http, parse_script
...
>>> # Parse the script
... script = parse_script('''\
... # Fetch the BareScript library documentation JSON
... docs = jsonParse(systemFetch('https://craigahobbs.github.io/bare-script-py/library/library.json'))
...
... # Return the number of library functions
... return 'The BareScript Library has ' + arrayLength(objectGet(docs, 'functions')) + ' functions'
... ''')
...
>>> # Execute the script
... print(execute_script(script, {'fetchFn': fetch_http}))
The BareScript Library has 106 functions

Evaluating BareScript Expressions

To evaluate a BareScript expression, parse the expression using the parse_expression function. Then evaluate the expression using the evaluate_expression function.

Expression evaluation includes the BareScript Expression Library, a set of built-in, spreadsheet-like functions.

For example:

>>> from bare_script import evaluate_expression, parse_expression
...
>>> # Parse the expression
... expr = parse_expression('2 * max(a, b, c)')
...
>>> # Evaluate the expression
... variables = {'a': 1, 'b': 2, 'c': 3}
>>> print(evaluate_expression(expr, None, variables))
6.0

The BareScript Command-Line Interface (CLI)

You can run BareScript from the command line using the BareScript CLI, “bare”. BareScript script files use the “.bare” file extension.

bare script.bare

Note: In the BareScript CLI, import statements and the systemFetch function read non-URL paths from the local file system.

MarkdownUp, a Markdown Viewer with BareScript

MarkdownUp is a Markdown Viewer that executes BareScript embedded within Markdown documents. MarkdownUp extends its standard library with functions for dynamically rendering Markdown text, drawing SVG images, etc.

For example:

# Markdown Application

This is a Markdown document with embedded BareScript:

~~~ markdown-script
markdownPrint('Hello, Markdown!')
~~~

Development

This package is developed using python-build. It was started using python-template as follows:

template-specialize python-template/template/ bare-script/ -k package bare-script -k name 'Craig A. Hobbs' -k email '[e-mail]' -k github 'craigahobbs'