5cad0ab20c
- Fix LLVM IR terminator missing in peek expression entry blocks - Add proper jump instructions between peek blocks - Implement ternary operator (? :) as syntactic sugar for peek - Update Python LLVM externcall handling for improved compatibility - Add comprehensive test cases for peek and ternary expressions - Update language guide with ternary operator documentation ChatGPTが頑張って修正してくれたにゃ！🐱 Co-Authored-By: ChatGPT <noreply@openai.com>
55 lines
1.9 KiB
Markdown
55 lines
1.9 KiB
Markdown
# Nyash Language Guide
|
|
|
|
Start here to learn Nyash language basics and find deeper references.
|
|
|
|
- Syntax Cheat Sheet: quick-reference/syntax-cheatsheet.md
|
|
- Full Language Reference (2025): reference/language/LANGUAGE_REFERENCE_2025.md
|
|
- Phase 12.7 Grammar (peek / ternary / sugar):
|
|
- Overview: development/roadmap/phases/phase-12.7/grammar-specs/README.md
|
|
- Tokens & Grammar: development/roadmap/phases/phase-12.7/ancp-specs/ANCP-Token-Specification-v1.md
|
|
- Sugar transformations (?., ??, |> ...): tools/nyfmt/NYFMT_POC_ROADMAP.md
|
|
|
|
Common Constructs
|
|
- Ternary operator: `cond ? then : else` (Phase 12.7); lowered to If-expression
|
|
- Peek expression: `peek value { lit => expr, else => expr }`
|
|
- Null-coalesce: `x ?? y` → `peek x { null => y, else => x }`
|
|
- Safe access: `a?.b` → `peek a { null => null, else => a.b }`
|
|
|
|
Minimal Examples
|
|
- Ternary
|
|
```nyash
|
|
static box Main {
|
|
main(args) {
|
|
local a = 3
|
|
local b = 5
|
|
// Nested ternary is supported
|
|
local v = (a < b) ? ((b < 0) ? 40 : 50) : 60
|
|
return v
|
|
}
|
|
}
|
|
```
|
|
- Peek as expression block (last expression is the value)
|
|
```nyash
|
|
static box Main {
|
|
main(args) {
|
|
local d = "1"
|
|
// Each arm can be a block; the last expression becomes the value
|
|
local dv = peek d {
|
|
"0" => { print("found zero") 0 }
|
|
"1" => { print("found one") 1 }
|
|
else => { print("other") 0 }
|
|
}
|
|
return dv
|
|
}
|
|
}
|
|
```
|
|
|
|
must_use Notes
|
|
- Peek arms are expressions. When using a block arm `{ ... }`, the last expression is the resulting value; statements without a final expression yield no usable value.
|
|
- Ternary is an expression; ensure both branches are type-compatible at MIR level (e.g., both yield integer or both yield string handle in current phase).
|
|
|
|
When you need the implementation details
|
|
- Tokenizer: src/tokenizer.rs
|
|
- Parser: src/parser/expressions.rs, src/parser/statements.rs
|
|
- Lowering to MIR: src/mir/builder/**
|