print: always print attributes inline and with per-attribute #[...] syntax.
#35
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This was referenced Jun 8, 2023
eddyb
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Jun 11, 2023
…dth back to 120. (#37) *Originally found/fixed during the #33/#34/#35/#36 series of pretty-printing PRs.* Before this PR, we were treating all text the same, regardless of style, but this PR introduces the concept of "fractional columns" (integer multiples of `0.1ch`, because our `font-size`s are always integer multiples of `0.1em`). The result is much more accurate, and so far appears to perfectly match browser behavior (i.e. the transition of `MAX_LINE_WIDTH` from `N-1` to `N`, where multi-line layout gets replaced with single-line layout, results in a line that "tightly fits" in a `max-width: Nch` container, with no spurious gaps or overflows). Note however that the increased accuracy makes the layout favor HTML over plaintext (and we don't have a plaintext-vs-HTML "simultaneous layout", nor a way to hint what the output of pretty layout will be used for), so the plaintext output may feel more inconsistent as a result (but its aesthetics are of dubious value anyway).
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This moves us from my ad-hoc
#{A, B, C}to a Rust-style#[A] #[B] #[C]attribute syntax, and removes the idea of a "attribute set shorthand" (attrs123 = #{...}followed by uses of#attrs123), which was more annoying than useful (attributes can't refer to other attributes so there was no "exponential deduplication" need for it).With
#[...]syntax, it also makes sense to never say e.g.OpDecorate(as the operand itself will contain the wordDecoration), or to use#[name = "..."]Rust-style syntax forOpName.(I didn't touch
OpMember{Name,Decorate}, might be worth having a SPIR-Tstructtype declaration syntax just to clean those up but it feels even more ad-hoc than usual - maybe it might make more sense after #36?)Comparison (using Kajiya's
assets/shaders/raster_simple_ps.hlsl, compiled by DXC, like #33):(click for complete pretty HTML example)
(click for complete pretty HTML example)