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## std/format: Niceties around printing and debugging.
## This module is imported by default.
## The Display interface. Any type implementing `str` is printable.
## Any type that is Display must also implement Debug.
pub type Display = interface
str(Self): str
dbg(Self): str
## The Debug interface. Broadly implemented for every type with magic,
## types can (and should) override the generic implementations.
pub type Debug = interface
dbg(Self): str
## Prints all of its arguments to the command line.
pub proc 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! does not count as a side effect
pub func dbg(params: varargs[Debug]) =
stdout.write(params.map(x => x.dbg).join(" "), "\n")
## A dummy implementation of the Display interface for strings.
pub func str(self: str): str = self
## An implementation of the Debug interface for strings.
pub func dbg(self: str): str = "\"" & self & "\""
## An implementation of the Debug interface for all structs.
## Uses the special `struct` typeclass.
pub func dbg(self: struct): str =
"{" & self.fields.map(field => field.id & field.value.dbg) & "}"
## An implementation of the Debug interface for all tuples.
## Uses the special `tuple` typeclass.
pub func dbg(self: tuple): str =
result &= "("
for i, field in self.fields.enumerate():
result &= field.id.map(id => id & " = ").get_or("")
if i != self.fields.len:
result &= ", "
result &= ")"
## An implementation of the Debug interface for all arrays and lists.
pub func dbg(self: Iter[Debug]): str =
"[" & self.map(x => x.str).join(", ") & "]"
## The fmt macro. Builds a formatted string from its arguments.
pub macro fmt(formatted: static[str], args: varargs[Display]) =
# if not formatted of String:
# macro_error("fmt must take a static string parameter!")
...
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