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## std.format: Niceties around printing and debugging.
## This module is imported by default.
## The Display class. Any type implementing `str` is printable.
## Any type that is Display must necessarily also implement Debug.
pub type Display = class
str(Self): str
dbg(Self): str
## The Debug class. Broadly implemented for every type with compiler magic.
## Types can (and should) override the generic implementations.
pub type Debug = class
dbg(Self): str
## Prints all of its arguments to the command line.
pub func print(params: varargs[Display]) =
stdout.write(params.map(x => x.str).join(" "), "\n")
## Prints all of its arguments to the command line, in Debug form.
##
## Note: this function is special! It does not count as a side effect.
## This breaks effect tracking, of course: but `dbg` is for debugging.
## It will produce a warning in code compiled for release.
@[pure]
pub func dbg(params: varargs[Debug]) =
stdout.write(params.map(x => x.dbg).join(" "), "\n")
## A dummy implementation of the Display class for strings.
pub func str(self: str): str = self
## An implementation of the Debug class for strings.
pub func dbg(self: str): str = "\"" & self & "\""
## An implementation of the Debug class for all structs.
## Uses the special `struct` typeclass.
pub func dbg[T: Debug](self: struct[T]): str =
"{{}}".fmt(self.fields.map((key, val) => key & ":" & val.dbg))
## An implementation of the Debug class for all tuples.
## Uses the special `tuple` typeclass.
pub func dbg[T: Debug](self: tuple[T]): str =
"({})".fmt(self.fields.map((key, val) =>
key.map(x => x & ":").get_or("") & val.dbg).join(", "))
## An implementation of the Debug class for all arrays and lists.
pub func dbg[T: Debug](self: Iter[T]): str =
"[{}]".fmt(self.map(x => x.dbg).join(", "))
## The fmt macro. Builds a formatted string from its arguments.
pub macro fmt(self: const str, args: varargs[Display]): str =
let parts = self.split("{}")
if parts.len != args.len + 1 then
macro_error("wrong number of arguments")
use std.ast
var res = parts.get(0)!
for i, arg in args do
res &= quote(`parts` & str(`arg`) &) # fixme
res &= parts.last()!
res
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