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ブロックをカッコではなくインデントで表現するようにしたい
構文例
@fn(x)
? (x = 42) << yes
? (x = 21)
no
.
yes
for #i, 100
<: ? ((i % 15) = 0) "FizzBuzz"
.? ((i % 3) = 0) "Fizz"
.? ((i % 5) = 0) "Buzz"
. i
#foo = do
#a = 1
#b = 2
(a + b)
<: foo // 3
@foo(x)
? (x = 42)
<< "foo"
"bar"
YAMLのパーサとか参考になりそう https://github.com/nodeca/js-yaml/blob/master/lib/loader.js
YAMLのPEGらしきものあった https://github.com/cierelabs/yaml_spirit/blob/master/doc/specs/yaml-peg.txt
メモ
The off-side rule can be implemented in the lexical analysis phase, as in Python, where increasing the indenting results in the lexer outputting an INDENT token, and decreasing the indenting results in the lexer outputting a DEDENT token.[5] These tokens correspond to the opening brace { and closing brace } in languages that use braces for blocks, and means that the phrase grammar does not depend on whether braces or indentation are used. This requires that the lexer hold state, namely the current indent level, and thus can detect changes in indentation when this changes, and thus the lexical grammar is not context-free: INDENT and DEDENT depend on the contextual information of the prior indent level.
https://en.wikipedia.org/wiki/Off-side_rule
こう？
@max3(x, y, z)
@max(a, b)
? (a > b)
a
.
b
max(max(x, y), z)
<: max3(1, 2, 3)
いろいろとめんどくさそう(構文解析的にも変更の影響の大きさ的にも)だからやめるか やるにしてもいっそ別言語かaltAiScriptみたいな感じにするとか