Joseph Ferano
d6fc15474b
The author: "I think I prefer length over len, because then I'll use len as the variable name". One arm in check.ml, one row in the table beside it, and every (len x) in lib, test, examples, vendor, spike, docs, web, emacs, plan.org and NEXT.md rewritten. Shadowing and builtin/ had already taken most of the sting out: a (defn len ...) was legal and won in its own file, and builtin/len reached past it. What was left is that len was still a builtin — the defn earned a warning, and a wrapper had to say builtin/ at every inner call. Now there is nothing under the short name: len is an ordinary identifier in every position, which is what (let [len (length xs)] ...) wants. length takes over as shadowing's worked example rather than the feature losing one. shadow-builtin.flan, builtin-qualified.flan, pkgs/shadowed and the builtin/ rows in test_flan move to it and go on testing shadowing. A call to a len nothing defines is answered where an unknown function is, after every table and after the shadowing guard, so a program with its own len never reaches it. The sentence is said rather than guessed at — len and length are three edits apart and the did-you-mean's net is one — and the call is written back out through spell_arg, as-slice's spelling lifted out of it and now shared, so what is printed compiles. sand.flan:33 still calls the old name and is the author's to change; until it does, test_acceptance and test_session abort there. Both were run green against a copy with that one line changed. FIX.org says so.
125 lines
4.9 KiB
Plaintext
125 lines
4.9 KiB
Plaintext
;;;; println, one row per arm of the structural printer.
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;;;;
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;;;; The walk in render.ml is shared with the REPL, but until now its only
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;;;; coverage was the REPL tests -- and those run a dev build, where the pieces
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;;;; go to flan_dev_emit. println is the same walk with the other emitter, in
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;;;; an ordinary build, so every arm needs saying again here: the two emitters
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;;;; are the one thing the shared module does *not* make identical.
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;;;;
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;;;; Run at -O0 as well as -O2. The slice arm emits a loop over slots taken
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;;;; from the enclosing function's frame, and mem2reg is exactly the pass that
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;;;; would launder a slot mistake into working code.
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(defstruct V [x f32 y f32])
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(defstruct Blob [id i32 name string pos V tags [3 i32]])
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(defenum Colour [red 0 green 1 blue 2])
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;; Five deep, so the walk hits max_depth (4) and prints "..." rather than
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;; descending forever. A self-containing struct is the case this cap exists
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;; for; five nested ones are the same shape without needing a pointer.
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(defstruct D5 [n i32])
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(defstruct D4 [d D5])
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(defstruct D3 [d D4])
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(defstruct D2 [d D3])
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(defstruct D1 [d D2])
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(defonce b Blob)
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(defonce col Colour)
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(defonce big u64)
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(defonce small u64)
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(defonce arr [4 i32])
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(defonce wide [10 i32])
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(defonce deep D1)
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(defonce n i32)
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(defstruct Long [s string])
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(defonce long-one Long)
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(defn nothing [] () )
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(defn find-it [s [i32] k i32] (Option i32)
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(dotimes [i (length s)]
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(when (= (at s i) k) (return (Some i))))
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None)
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(defn main [] i32
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;; A string at top level prints raw. Anywhere else it is quoted, which the
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;; Blob row below shows -- the two are the same value printed two ways on
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;; purpose, and that difference is the thing most likely to be "fixed".
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(println "plain string")
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(println (bytes-view "plain bytes"))
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(println 42)
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(println -7)
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(set small 5)
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(println small)
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;; The u64 row. Through the signed printer this reads -1, which is the one
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;; way println could disagree with the REPL about a value both can hold.
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(set big 0xFFFFFFFFFFFFFFFF)
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(println big)
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(println 3.5)
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(println -0.25)
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(println true)
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(println false)
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;; () is evaluated and *then* reported: a () expression is a call made
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;; for its effect, so emitting () without running it would be a lie.
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(println (nothing))
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(set col :green)
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(println col)
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;; red is 0, which is also the zero value, so this row says the chain of
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;; comparisons reaches the *first* member and does not fall through to the
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;; number it is erased to.
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(set col :red)
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(println col)
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;; A pointer is its shape and is never followed -- the only thing that could
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;; make this walk cycle.
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(set n 3)
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(println (addr n))
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(println (find-it (slice wide 0 10) 0))
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(println (find-it (slice wide 0 10) 99))
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(set (.id b) 7)
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(set (.name b) "sandy \"quoted\"")
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(set (.x (.pos b)) 1.5)
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(set (.y (.pos b)) -2.0)
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(set (at (.tags b) 1) 42)
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(println b)
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(set (at arr 2) 9)
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(println arr)
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;; Ten elements against a span cap of eight: eight, then "...".
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(set (at wide 9) 1)
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(println wide)
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;; A slice's length is not known until it runs, so this is the arm that
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;; emits a loop rather than unrolling.
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(println (slice arr 1 4))
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(set (.n (.d (.d (.d (.d deep))))) 5)
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(println deep)
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;; Two slice printlns in one function, and one inside a loop: the slots the
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;; loop needs are allocated per *call site* at check time, not per iteration.
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(dotimes [i 2]
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(println (slice arr 0 2)))
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(println (slice arr 2 4))
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;; A nested string longer than the escape buffer. Escaping is the one
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;; conversion whose output is not a bounded handful of characters, so it
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;; truncates -- with an ellipsis inside the quotes, because a value that
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;; prints as a shorter value is the failure nobody notices.
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(set (.s long-one) "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx")
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(println long-one)
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;; print is println without the newline.
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(print "a")
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(print "b")
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(println "c")
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0)
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