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|
require "lib/metaprogramming.nom"
require "lib/operators.nom"
require "lib/utils.nom"
# Conditionals
macro statement [if %condition %if_body] =:
".."|if \%condition as lua\ then
| \(lua expr "vars.if_body.value") as lua\
|end
macro statement [if %condition %if_body else %else_body] =:
".."|if \%condition as lua\ then
| \(lua expr "vars.if_body.value") as lua\
|else
| \(lua expr "vars.else_body.value") as lua\
|end
# Return
macro statement [return] =: "do return end"
macro block [return %return-value] =: ".."
|return \%return-value as lua\
macro [do %action] =: ".."
|(\%action as lua\)(nomsu, setmetatable({}, {__index=vars}))
# GOTOs
macro statement [-> %label] =: ".."
|::label_\nomsu "var_to_lua_identifier" [%label]\::
macro statement [go to %label] =: ".."
|goto label_\nomsu "var_to_lua_identifier" [%label]\
# Loop control flow
macro statement [break] =: "break"
macro statement [break for] =: "goto break_for"
macro statement [break for-all] =: "goto break_for_all"
macro statement [break repeat] =: "goto break_repeat"
macro statement [break repeat-until] =: "goto break_repeat_until"
macro statement [break repeat-while] =: "goto break_repeat_while"
macro statement [break %var, stop getting %var, no more %var] =: ".."
|goto break_\nomsu "var_to_lua_identifier" [%var]\
macro statement [continue] =: "continue"
macro statement [continue for] =: "goto continue_for"
macro statement [continue for-all] =: "goto continue_for_all"
macro statement [continue repeat] =: "goto continue_repeat"
macro statement [continue repeat-until] =: "goto continue_repeat_until"
macro statement [continue repeat-while] =: "goto continue_repeat_while"
macro statement [continue %var, go to next %var, on to the next %var] =: ".."
|goto continue_\nomsu "var_to_lua_identifier" [%var]\
# While loops
macro block [repeat %body] =:
".."|while true do
| \(lua expr "vars.body.value") as lua\
| ::continue_repeat::
|end
|::break_repeat::
macro block [repeat while %condition %body] =:
".."|while \%condition as lua\ do
| \(lua expr "vars.body.value") as lua\
| ::continue_repeat_while::
|end
|::break_repeat_while::
macro block [repeat until %condition %body] =:
".."|while not (\%condition as lua\) do
| \(lua expr "vars.body.value") as lua\
| ::continue_repeat_until::
|end
|::break_repeat_until::
# For loops
macro block [for %var in %iterable %body] =:
%var-type =: lua expr "vars.var.type"
assert (%var-type == "Var") ".."
|For loop has the wrong type for the loop variable. Expected Var, but got: \%var-type\
# This trashes the loop variables, just like in Python.
".."
|for i,value in ipairs(\%iterable as lua\) do
| \%var as lua\ = value
| \(lua expr "vars.body.value") as lua\
| ::continue_for::
| ::continue_\nomsu "var_to_lua_identifier" [%var]\::
|end
|::break_for::
|::break_\nomsu "var_to_lua_identifier" [%var]\::
macro block [for all %iterable %body] =:
pass # TODO: fix compiler bug
# This trashes the loop variables, just like in Python.
".."|for i,value in ipairs(\%iterable as lua\) do
| vars.it = value
| \(lua expr "vars.body.value") as lua\
| ::continue_for_all::
|end
|::break_for_all::
# Switch statement/multi-branch if
macro block [when %body] =:
%result =: ""
for %statement in (lua expr "vars.body.value.value"):
%func-call =: lua expr "vars.statement.value"
assert ((lua expr "vars['func-call'].type") == "FunctionCall") ".."
|Invalid format for 'when' statement. Only '?' blocks are allowed.
%tokens =: lua expr "vars['func-call'].value"
%q =: lua expr "vars.tokens[1]"
assert (((lua expr "vars.q.type") == "Word") and ((lua expr "vars.q.value") == "?")) ".."
|Invalid format for 'when' statement. Lines must begin with '?'
%thunk =: lua expr "vars.tokens[#vars.tokens]"
assert ((lua expr "vars.thunk.type") == "Thunk") ".."
|Invalid format for 'when' statement. Lines must have a body.
%condition_bits =: []
for %i in (2 up to (lua expr "#vars.tokens")):
lua block "table.insert(vars['condition_bits'], vars.tokens[vars.i])"
if (lua expr "#vars.condition_bits == 0"):
%result join=: ".."
|
|do
| \(lua expr "vars.thunk.value") as lua\
| goto finished_when
|end
..else:
if (lua expr "#vars.condition_bits == 1 and vars.condition_bits[1].type ~= 'Word'"):
%condition =: lua expr "vars.condition_bits[1]"
..else:
%condition =: dict [..]
["type",lua expr "vars['func-call'].type"]
["src",lua expr "vars['func-call'].src"]
["value", %condition_bits]
%result join=: ".."
|
|if \%condition as lua\ then
| \(lua expr "vars.thunk.value") as lua\
| goto finished_when
|end
%result join=: "\n::finished_when::"
%result
# Switch statement
macro block [when %branch-value %body] =:
%result =: ".."|local branch_value = \%branch-value as lua\
for %statement in (lua expr "vars.body.value.value"):
%func-call =: lua expr "vars.statement.value"
assert ((lua expr "vars['func-call'].type") == "FunctionCall") ".."
|Invalid format for 'when' statement. Only == blocks are allowed.
%tokens =: lua expr "vars['func-call'].value"
%eq =: lua expr "vars.tokens[1]"
assert (((lua expr "vars.eq.type") == "Word") and ((lua expr "vars.eq.value") == "==")) ".."
|Invalid format for 'when' statement. Lines must begin with '=='
%thunk =: lua expr "vars.tokens[#vars.tokens]"
assert ((lua expr "vars.thunk.type") == "Thunk") ".."
|Invalid format for 'when' statement. Lines must have a body.
%condition_bits =: []
for %i in (2 up to (lua expr "#vars.tokens")):
lua block "table.insert(vars.condition_bits, vars.tokens[vars.i])"
if (lua expr "#vars.condition_bits == 0"):
%result join=: ".."
|
|do
| \(lua expr "vars.thunk.value") as lua\
| goto finished_when
|end
..else:
if (lua expr "#vars.condition_bits == 1 and vars.condition_bits[1].type ~= 'Word'"):
%condition =: (lua expr "vars.condition_bits[1]")
..else:
%condition =: dict [..]
["type",lua expr "vars['func-call'].type"]
["src",lua expr "vars['func-call'].src"]
["value", %condition_bits]
%result join=: ".."
|
|if nomsu.utils.equivalent(branch_condition, \%condition as lua\) then
| \(lua expr "vars.thunk.value") as lua\
| goto finished_when
|end
%result join=: "\n::finished_when::"
%result
|
