mirror of
https://github.com/imjasonh/nescript
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7294ae3efa
Struct field types beyond the v1 scalar set (`u8`, `i8`, `u16`,
`bool`) used to error out with `E0201: struct fields must be
u8/i8/u16/bool`. The size accumulator already handled them
correctly — what was missing was: (1) the analyzer side that
synthesizes per-leaf symbols and allocations for nested structs
plus a single array-typed symbol for array fields, (2) the
parser's chained-field-access path, and (3) the IR-lowering
recursion through nested struct literal initializers and array
literal field values.
The synthetic-variable model carries through unchanged: a
`var p: Player` where `Player { pos: Vec2, hp: u8, inv: u8[4] }`
and `Vec2 { x: u8, y: u8 }` produces flat allocations for
`p.pos.x`, `p.pos.y`, `p.hp`, and `p.inv`, plus an intermediate
`p.pos` Struct symbol so dotted-name lookups still resolve. Array
fields get a single allocation with the array type so the
existing `Expr::ArrayIndex` lowering path handles `p.inv[i]`
without changes. Array-of-structs is still rejected with E0201
because the synthetic model can't index per-element layouts
without further codegen work.
The parser change is the only structural move: `parse_primary`
and `parse_assign_or_call` now loop the dot chain into a single
joined identifier so `p.pos.x` becomes `FieldAccess("p.pos", "x")`
and `p.inv[0]` becomes `ArrayIndex("p.inv", 0)`. The downstream
analyzer and IR lowering use the same `format!("{name}.{field}")`
join they already used for one-level access — no plumbing
changes required.
Includes a new `examples/nested_structs.ne` that exercises both
features end-to-end with two `Hero` instances carrying nested
positions and inventory arrays. The reproducibility tripwire
ROM is committed alongside it and the emulator harness has a
matching pair of golden files.
https://claude.ai/code/session_01KEczoNUX3WmcFLfq6iAQxB
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| .. | ||
| arrays_and_functions.audio.hash | ||
| arrays_and_functions.png | ||
| audio_demo.audio.hash | ||
| audio_demo.png | ||
| bitwise_ops.audio.hash | ||
| bitwise_ops.png | ||
| bouncing_ball.audio.hash | ||
| bouncing_ball.png | ||
| coin_cavern.audio.hash | ||
| coin_cavern.png | ||
| comparisons.audio.hash | ||
| comparisons.png | ||
| friendly_assets.audio.hash | ||
| friendly_assets.png | ||
| function_chain.audio.hash | ||
| function_chain.png | ||
| hello_sprite.audio.hash | ||
| hello_sprite.png | ||
| inline_asm_demo.audio.hash | ||
| inline_asm_demo.png | ||
| logic_ops.audio.hash | ||
| logic_ops.png | ||
| loop_break_continue.audio.hash | ||
| loop_break_continue.png | ||
| match_demo.audio.hash | ||
| match_demo.png | ||
| mmc1_banked.audio.hash | ||
| mmc1_banked.png | ||
| mmc3_per_state_split.audio.hash | ||
| mmc3_per_state_split.png | ||
| nested_structs.audio.hash | ||
| nested_structs.png | ||
| noise_triangle_sfx.audio.hash | ||
| noise_triangle_sfx.png | ||
| palette_and_background.audio.hash | ||
| palette_and_background.png | ||
| platformer.audio.hash | ||
| platformer.png | ||
| scanline_split.audio.hash | ||
| scanline_split.png | ||
| sprites_and_palettes.audio.hash | ||
| sprites_and_palettes.png | ||
| state_machine.audio.hash | ||
| state_machine.png | ||
| structs_enums_for.audio.hash | ||
| structs_enums_for.png | ||
| two_player.audio.hash | ||
| two_player.png | ||
| uxrom_banked.audio.hash | ||
| uxrom_banked.png | ||
| uxrom_user_banked.audio.hash | ||
| uxrom_user_banked.png | ||
