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Scrall Pseudo-Action Language for Executable UML

License: MIT License

Python 92.13% PEG.js 7.87%

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Incorrect sort operators in examples

https://github.com/modelint/scrall/wiki/Table-variable

Several examples have the older version of the sort operator:
highest alt speed = #Aircraft(1, +^ Altitude).Speed // ERROR

Incorrect operator in assigner example

https://github.com/modelint/scrall/wiki/Guiding-principles

example:
// Scrall
high aircraft = Aircraft(Altitude > ceiling)

operator should either be .= or more likely ..=

Exclude keywords

Discussed in #5

^{Originally posted by lelandstarr January 11, 2022}

scrall/Grammar/scrall.peg

Line 23 in 8b9dd84

//ignore_keywords = (

//ignore_keywords = (
//    !" true" !"true " !" false" !"false "
//    !" and" !"and " !" or" !"or "!" not" !"not "
//    !" its" !"its " ! " me" !" me"
//)
word = r'[A-Za-z][A-Za-z0-9]*'
//word = ignore_keywords r'[A-Za-z][A-Za-z0-9]*'
name = word (NAME_GLUE word)* // One word or a sequence of delimited words (name used for most model elements)

if you attach the negative lookahead to WORD rather then name, it will catch the keywords AS words. This way you do not have to worry about white space.

I have this working in java and have checked that python also has the same negative lookahead syntax.

//Here is word as allowed_word with the keyword exclusion.
allowed_word = r'(?!(true|false|and|or|me|its|not))[A-Za-z][A-Za-z0-9]*'

// and then name would still be
name = allowedword (NAME_GLUE allowedword)* 

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