Trees は、ブロックプログラミング言語で、以下の特徴を備えています！
┌─────┐
│print│
└───┬─┘
┌───┴─┐
┌───┤ * ├──┐
│ └─────┘ │
┌───┴─┐ ┌───┴─┐
│ 3 │ │ 4 │
└─────┘ └─────┘
チュートリアルは https://github.com/Snowman-s/trees/wiki を参照ください。
$ git clone https://github.com/Snowman-s/Trees.git
$ cd Trees
$ cargo build --release
上記コマンドを実行すると、target/release 内に実行可能ファイルができているはずです。
現在のブロッククォートでは、他の所で exec されるに際して、そこでの名前空間の制約を受ける問題があります。（名前空間が衝突する恐れがある）
ので、クォートされたブロックが実行するに際して、子孫のブロックに対する ProcedureOrVar を確定させます。
$ から始まるプロシージャ名を持つブロック、または get にて参照される名前空間は固定しません同一スコープ同一変数の演算を繰り返すと値が破壊される
┌─────┐
│ seq ├─────────────────────────────────┐
└──┬──┘ ┌────┐ ┌─┴───┐
┌──┴────┐ │ ┌─•───┐ │print│
│defproc├─┘ │exec ├────────────┐ └─┬───┘
└──┬────┘ └─────┘ ┌─┴───┐ ┌─┴───┐
┌──┴──┐ ┌───────────────────┤if0 │ │ fib │
│"fib"│ ┌─┴──┐ └─┬─┬─┘ └─┬───┘
└─────┘ │ $0 │ ┌──────────────┘ │ ┌─┴──────────┐
└────┘ ┌─•─┐ ┌───┴─┐ │ str to int │
│ 1 │ ┌──────┤ifn0 │ └───┬────────┘
└───┘ ┌─┴─┐ └─┬──┬┘ ┌─┴─────────┐
┌─────────────────┤ = │ ┌──┘ │ │ read line │
┌─┴──┐ └─┬─┘ ┌─•─┐ ┌•──┐ └───────────┘
│ $0 │ ┌────────────┘ │ 1 │ │ + │
└────┘ ┌─┴─┐ └───┘ └┬─┬┘
│ 1 │ ┌────────────────┘ │
└───┘ ┌──┴──┐ ┌────┴┐
│ fib │ │ fib │
└──┬──┘ └──┬──┘
┌──┴──┐ ┌──┴──┐
│ - │ │ - │
└┬───┬┘ └┬───┬┘
┌┴─┐┌┴┐ ┌┴─┐┌┴┐
│$0││1│ │$0││1│
└──┘└─┘ └──┘└─┘
変更前の実行結果
.\target\release\trees.exe .\tutorial\fibonacci.tr
2
エラーが発生しました：Undefined Proc Name $0
◦
└seq <-
├defproc = <Void>
└print <-
└fib <-
└str to int = 2
起因：
◦
└exec <-
└if0 = Block +
起因：
◦
└+ <-
├fib <-
│└- <-
│ ├$0 <-
│ └1
└fib
名前空間：
[cmd, if0, <=, =, if, ifn0, %, str to int, >=, for, split str, str to bytes, print, /, +, >, get, bytes to str, set, include, strcat, \0, export, [], exec, println, read line, -, \t, defset, and, listing, <, *, \r, seq, while, reexport, \n, or, xor, to str, len, defproc]
[]
[fib]
[]
[$args=[]]
[]
[]
[]
$0が未定義になったのはクォートとクロージャの分離によっておきた者と考えられる
e.g.
+-----+
| a +----+
+-----+ |
+--+--+
| b |
+-----+
実装としてはパースの変更と､罫線ほど分解能がないため幾分か記述の自由度が低くなりますが､等幅フォントでもCJK文脈に横罫線の長さが依存する問題などが解消できる手段の一つではあると思います (重要: ブロックプログラミング､ということを考えるとバカさ加減が薄れそうです)
フォントによっては 「 ─ 」 の長さがアルファベット２つ分であることがあるのでこれを変更できるようにしたい。
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