db6f39a2a4
Defines syntax decisions and implementation plan across 7 issues:
- backtick command execution returning {code, stdout, stderr}
- ${expr} interpolation in backticks
- $SIGIL env var read/write
- argv parsing, piping, and redirection (future)
24 lines
848 B
Markdown
24 lines
848 B
Markdown
# 02 — Complete backtick command lexing and parsing
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**Status:** open
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**Blocked by:** #01
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**Blocks:** #03
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Backtick lexing is partially implemented:
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- `llex.c`: TK_COMMAND token lexed via `read_string()` on backtick
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- `llex.h`: TK_COMMAND enum added
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- `lparser.c`: TK_COMMAND handled in `simpleexp()` (as string) and `suffixedexp()` (as func args)
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## Remaining work
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- Verify the lexer handles edge cases (escaped backticks, newlines, nested quotes)
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- Parser must emit code that produces a result table (`{code, stdout, stderr}`) at runtime, not just a string literal
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- May need a new opcode (e.g. `OP_COMMAND`) or compile as a call to a built-in execution function
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- Add string interpolation inside backticks if decided in #01
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## Files touched
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- `llex.c` / `llex.h`
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- `lparser.c`
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- Possibly `lopcodes.h` / `lopcodes.c` if adding a new opcode
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