1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
|
/*
* Rust code generation for gipfel-rs.
*
* Port of gipfel's expr2c.mac (Copyright 2006-2009 Johannes Hofmann).
* Emits one Rust function per line (grep "^pub fn"); integer literals are
* converted to float literals by fixup.py afterwards.
*/
load("stringproc")$
varsubst(v) := ssubst("_", "%", string(v))$
printdecl(vars) := (
sprint("let mut", varsubst(first(vars)), ": f64 = 0.0;"),
for v in rest(vars) do sprint("let mut", varsubst(v), ": f64 = 0.0;"))$
printdef(expr) := sprint(varsubst(first(expr)), "=", varsubst(second(expr)), ";")$
block2rust(expr) :=
if ?equal(op(expr), block) then (
printdecl(first(expr)),
for d in reverse(rest(reverse(rest(expr)))) do printdef(d),
sprint("return", varsubst(last(expr)), ";"))
else
sprint("return", varsubst(expr), ";")$
expr2rust(funcname, argstr, expr) := (
sprint("pub fn", funcname, "(", argstr, ") -> f64 {"),
block2rust(subst(pow, "^", optimize(expr))),
sprint("}", "
"))$
|
