Lib.rs

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#yggdrasil #compiler #grammar #name #command-line #element #class

nightly app ycc

Yggdrasil Command-line Compiler

1 unstable release

0.0.0	Nov 10, 2022

#12 in #yggdrasil

MPL-2.0 license

415KB
9K SLoC

Yggdrasil Generative Grammar

Features

Language Tutorial

basic syntax

Name	Description
`a?`	Optional element
`a*`	Zero or more elements
`a+`	One or more elements
`a b`	Sequence of elements
`a \| b`	Alternative of branch
`name:e`	Mark element with given name
`#Name`	Mark branch with given name
`^rule`	Remark element
`@macro()`	Macro call
`ANY`	Any unicode characters
`IGNORED`	All rules marked as ignored

class vs union

The same syntax A | B performs differently in class and union context.

// expand `A | B` as class
class TestA {
    | tag_a:A 
    | tag_b:B
}
// expand `A | B` as union
union TestB {
    | A #BranchA
    | B #BranchB
}

struct TestA {
    tag_a: A,
    tag_b: B,
}

enum TestB {
    BranchA(A),
    BranchB(B),
}

examples

You can learn more from project-yggdrasil.

Tools

JetBrains Support

Dependencies

~7–19MB
~198K SLoC