6ca56b0652
- ArrayLiteral/MapLiteralのAST定義追加
- パーサーで[...]と{...}構文をサポート
- MIR Builderでnew Box() + push/setへのdesugaring実装
- テストケースとスモークスクリプト追加
- CURRENT_TASK.mdにネームスペース解決Phase-1計画を追記
- 3段階解決順序（ローカル→エイリアス→プラグイン）の設計合意
1.8 KiB
Nyash Grammar (Stage‑2 EBNF)
Status: Fixed for Phase 15 Stage‑2. Parser implementations (Rust/Python/Nyash selfhost) should conform to this subset.
program := stmt* EOF
stmt := 'return' expr | 'local' IDENT '=' expr | 'if' expr block ('else' block)? | 'loop' '('? expr ')' ? block | expr ; expression statement
block := '{' stmt* '}'
expr := logic logic := compare (('&&' | '||') compare)* compare := sum (( '==' | '!=' | '<' | '>' | '<=' | '>=' ) sum)? sum := term (('+' | '-') term)* term := unary (('' | '/') unary) unary := '-' unary | factor
factor := INT | STRING | IDENT call_tail* | '(' expr ')' | 'new' IDENT '(' args? ')' | '[' args? ']' ; Array literal (Stage‑1 sugar, gated) | '{' map_entries? '}' ; Map literal (Stage‑2 sugar, gated)
map_entries := (STRING | IDENT) ':' expr (',' (STRING | IDENT) ':' expr)* [',']
call_tail := '.' IDENT '(' args? ')' ; method | '(' args? ')' ; function call
args := expr (',' expr)*
Notes
- ASI: Newline is the primary statement separator. Do not insert a semicolon between a closed block and a following 'else'.
- Short-circuit: '&&' and '||' must not evaluate the RHS when not needed.
- Unary minus has higher precedence than '*' and '/'.
- IDENT names consist of [A-Za-z_][A-Za-z0-9_]*
- Array literal is enabled when syntax sugar is on (NYASH_SYNTAX_SUGAR_LEVEL=basic|full) or when NYASH_ENABLE_ARRAY_LITERAL=1 is set.
- Map literal is enabled when syntax sugar is on (NYASH_SYNTAX_SUGAR_LEVEL=basic|full) or when NYASH_ENABLE_MAP_LITERAL=1 is set.
- Identifier keys (
{name: v}) are Stage‑3 and require either NYASH_SYNTAX_SUGAR_LEVEL=full or NYASH_ENABLE_MAP_IDENT_KEY=1.