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6e46f042fd
nomsu/lib/core.nom
Bruce Hill 6e46f042fd Mostly working overhaul again that strips out ending lines with "..", 
and simplifies a lot of the code. Also stripped out Expression, which
was just a useless level of indirection.
2017-09-20 03:06:15 -07:00

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# Rule for making rules
lua block ".."
|compiler:defmacro("rule %spec = %body", function(compiler, vars, kind)
| if kind == "Expression" then
| compiler:error("Cannot use rule definitions as an expression.")
| end
| local spec = compiler:get_invocations_from_definition(vars.spec, vars)
| return ("compiler:def("..compiler.utils.repr(spec,true)..", "..compiler:tree_to_lua(vars.body, vars)..")"), true
|end)
rule [help %invocation] =:
lua block ".."
|local fn_info = compiler.defs[vars.invocation]
|if not fn_info then
| compiler:writeln("Function not found: "..compiler.utils.repr(vars.invocation, true))
|else
| compiler:writeln("rule "..compiler.utils.repr(fn_info.invocations).." ="..(fn_info.src or ":\\n <unknown source code>"))
|end
# Macros
lua block ".."
|local add_macro = function(compiler, vars, kind)
| local spec = compiler:get_invocations_from_definition(vars.spec, vars)
| local fn = compiler:tree_to_value(vars.body, vars)
| compiler:defmacro(spec, fn, vars.body.src)
| return "", true
|end
|compiler:defmacro("macro %spec = %body", add_macro)
|
|local add_macro_block = function(compiler, vars, kind)
| local spec = compiler:get_invocations_from_definition(vars.spec, vars)
| local fn = compiler:tree_to_value(vars.body, vars)
| local wrapper = function(compiler, vars, kind)
| if kind == "Expression" then
| compiler:error("Macro: "..spec.." was defined to be a block, but is being used as an expression.")
| end
| return ("do\\n"..fn(compiler, vars, kind).."\\nend"), true
| end
| compiler:defmacro(spec, wrapper, vars.body.src)
| return "", true
|end
|compiler:defmacro("macro block %spec = %body", add_macro_block)
# Compiler tools
rule [eval %code, run %code] =:
lua expr "compiler:run(vars.code)"
rule [source code from tree %tree] =:
lua block ".."
|local _,_,leading_space = vars.tree.src:find("\\n(%s*)%S")
|if leading_space then
| local chunk1, chunk2 = vars.tree.src:match(":%s*([^\\n]*)(\\n.*)")
| chunk2 = chunk2:gsub("\\n"..leading_space, "\\n")
| vars.source = chunk1..chunk2.."\\n"
|else
| vars.source = vars.tree.src:match(":%s*(%S.*)").."\\n"
|end
%source
macro [source code %body] =:
lua expr ".."
|compiler.utils.repr(compiler:call("source code from tree %", vars.body), true)
rule [run file %filename] =:
lua block ".."
|local file = io.open(vars.filename)
|return compiler:run(file:read("*a"))
# Error functions
rule [error!] =:
lua block ".."
|table.remove(compiler.callstack)
|compiler:error()
rule [error %msg] =:
lua block ".."
|table.remove(compiler.callstack)
|compiler:error(vars.msg)
# TODO: Make useful
macro [as lua %block] =:
lua expr "compiler.utils.repr(compiler:tree_to_lua(vars.block.value, 'Statement'), true)"
macro block [show generated lua %block] =:
".."|compiler:writeln(\lua expr "compiler.utils.repr(compiler:tree_to_lua(vars.block.value, 'Statement'), true)"\)
# Macro helper functions
rule [%tree as value] =:
lua expr ".."
|compiler:tree_to_value(vars.tree, vars)
rule [%tree as lua block] =:
lua block ".."
|return compiler:tree_to_lua(vars.tree, 'Statement'), true
rule [%tree as lua expr] =:
lua expr ".."
|compiler:tree_to_lua(vars.tree, 'Expression')
# Moonscript!
macro block [moonscript block %moonscript_code] =:
lua block ".."
|local parse, compile = require('moonscript.parse'), require('moonscript.compile')
|local moon_code = compiler:tree_to_value(vars.moonscript_code, vars)
|local tree, err = parse.string(moon_code)
|if not tree then
| compiler:error("Failed to parse moonscript: "..err)
|end
|local lua_code, err, pos = compile.tree(tree)
|if not lua_code then
| compiler:error(compile.format_error(err, pos, moon_code))
|end
|return "do\\n"..lua_code.."\\nend"
macro [moonscript %moonscript_code] =:
lua block ".."
|local parse, compile = require('moonscript.parse'), require('moonscript.compile')
|local moon_code = compiler:tree_to_value(vars.moonscript_code, vars)
|local tree, err = parse.string(moon_code)
|if not tree then
| compiler:error("Failed to parse moonscript: "..err)
|end
|local lua_code, err, pos = compile.tree(tree)
|if not lua_code then
| compiler:error(compile.format_error(err, pos, moon_code))
|end
|return "(function(compiler, vars)\\n"..lua_code.."\\nend)(compiler, vars)"
# String functions
rule [join %strs] =:
lua block ".."
|local str_bits = {}
|for i,bit in ipairs(vars.strs) do str_bits[i] = compiler.utils.repr(bit) end
|return table.concat(str_bits)
rule [join %strs with glue %glue] =:
lua block ".."
|local str_bits = {}
|for i,bit in ipairs(vars.strs) do str_bits[i] = compiler.utils.repr(bit) end
|return table.concat(str_bits, vars.glue)
rule [capitalize %str, %str capitalized] =:
lua expr ".."|vars.str:gsub("%l", string.upper, 1)
# Variable assignment
#..
macro block [%var = %value] =:
lua block ".."
|if vars.var.type ~= "Var" then
| compiler:error("Assignment operation has the wrong type for the left hand side. "
| .."Expected Var, but got: "..vars.var.type)
|end
".."|\%var as lua expr\ = \%value as lua expr\
lua block ".."
|local function helper(callback)
| return function(compiler, vars, kind)
| if kind == "Expression" then
| compiler:error("Cannot use an assignment operation as an expression value.")
| end
| if vars.var.type ~= "Var" then
| compiler:error("Assignment operation has the wrong type for the left hand side. "
| .."Expected Var, but got: "..vars.var.type)
| end
| if vars.rhs.type ~= "Thunk" then
| compiler:error("Assignment operation has the wrong type for the right hand side. "
| .."Expected Thunk, but got: "..vars.rhs.type.."\\nMaybe you used '=' instead of '=:'?")
| end
| local ret = "do\\n local ret"
| ret = ret .. "\\n "..compiler:tree_to_lua(vars.rhs.value, "Statement")
| ret = ret .. "\\n "..callback(compiler:tree_to_lua(vars.var, "Expression"))
| return (ret.."\\nend"), true
| end
|end
|compiler:defmacro("%var = %rhs", helper(function(var) return var.." = ret" end))
|compiler:defmacro("%var += %rhs", helper(function(var) return var.." = "..var.." + ret" end))
|compiler:defmacro("%var -= %rhs", helper(function(var) return var.." = "..var.." - ret" end))
|compiler:defmacro("%var *= %rhs", helper(function(var) return var.." = "..var.." * ret" end))
|compiler:defmacro("%var /= %rhs", helper(function(var) return var.." = "..var.." / ret" end))
|compiler:defmacro("%var ^= %rhs", helper(function(var) return var.." = "..var.." ^ ret" end))
|compiler:defmacro("%var and= %rhs", helper(function(var) return var.." = "..var.." and ret" end))
|compiler:defmacro("%var or= %rhs", helper(function(var) return var.." = "..var.." or ret" end))
|compiler:defmacro("%var concat= %rhs", helper(function(var) return var.." = "..var.." .. ret" end))
|compiler:defmacro("%var mod= %rhs", helper(function(var) return var.." = "..var.." % ret" end))
# Operators
macro [true, yes] =: "true"
macro [false, no] =: "false"
macro [nil, null] =: "nil"
macro block [nop, pass] =: ""
macro [%a + %b] =: ".."|(\%a as lua expr\ + \%b as lua expr\)
macro [%a + %b + %c] =: ".."|(\%a as lua expr\ + \%b as lua expr\ + \%c as lua expr\)
macro [%a + %b + %c + %d] =: ".."|(\%a as lua expr\ + \%b as lua expr\ + \%c as lua expr\ + \%d as lua expr\)
macro [%a - %b] =: ".."|(\%a as lua expr\ - \%b as lua expr\)
macro [%a * %b] =: ".."|(\%a as lua expr\ * \%b as lua expr\)
macro [%a * %b * %c] =: ".."|(\%a as lua expr\ * \%b as lua expr\ * \%c as lua expr\)
macro [%a * %b * %c * %d] =: ".."|(\%a as lua expr\ * \%b as lua expr\ * \%c as lua expr\ * \%d as lua expr\)
macro [%a / %b] =: ".."|(\%a as lua expr\ / \%b as lua expr\)
macro [%a === %b] =: ".."|(\%a as lua expr\ == \%b as lua expr\)
macro [%a !== %b] =: ".."|(\%a as lua expr\ ~= \%b as lua expr\)
macro [%a < %b] =: ".."|(\%a as lua expr\ < \%b as lua expr\)
macro [%a < %b < %c] =: ".."|((\%a as lua expr\ < \%b as lua expr\) and (\%b as lua expr\ < \%c as lua expr\))
macro [%a <= %b < %c] =: ".."|((\%a as lua expr\ <= \%b as lua expr\) and (\%b as lua expr\ < \%c as lua expr\))
macro [%a <= %b <= %c] =: ".."|((\%a as lua expr\ <= \%b as lua expr\) and (\%b as lua expr\ <= \%c as lua expr\))
macro [%a < %b <= %c] =: ".."|((\%a as lua expr\ < \%b as lua expr\) and (\%b as lua expr\ <= \%c as lua expr\))
macro [%a > %b > %c] =: ".."|((\%a as lua expr\ > \%b as lua expr\) and (\%b as lua expr\ > \%c as lua expr\))
macro [%a >= %b > %c] =: ".."|((\%a as lua expr\ >= \%b as lua expr\) and (\%b as lua expr\ > \%c as lua expr\))
macro [%a >= %b >= %c] =: ".."|((\%a as lua expr\ >= \%b as lua expr\) and (\%b as lua expr\ >= \%c as lua expr\))
macro [%a > %b >= %c] =: ".."|((\%a as lua expr\ > \%b as lua expr\) and (\%b as lua expr\ >= \%c as lua expr\))
macro [%a <= %b] =: ".."|(\%a as lua expr\ <= \%b as lua expr\)
macro [%a > %b] =: ".."|(\%a as lua expr\ > \%b as lua expr\)
macro [%a >= %b] =: ".."|(\%a as lua expr\ >= \%b as lua expr\)
macro [%a ^ %b] =: ".."|(\%a as lua expr\ ^ \%b as lua expr\)
macro [%a and %b] =: ".."|(\%a as lua expr\ and \%b as lua expr\)
macro [%a and %b and %c] =:
".."|(\%a as lua expr\ and \%b as lua expr\ and \%c as lua expr\)
macro [%a and %b and %c and %d] =:
".."|(\%a as lua expr\ and \%b as lua expr\ and \%c as lua expr\ and \%d as lua expr\)
macro [%a or %b] =: ".."|(\%a as lua expr\ or \%b as lua expr\)
macro [%a or %b or %c] =:
".."|(\%a as lua expr\ or \%b as lua expr\ or \%c as lua expr\)
macro [%a or %b or %c or %d] =:
".."|(\%a as lua expr\ or \%b as lua expr\ or \%c as lua expr\ or \%d as lua expr\)
macro [%a mod %b] =: ".."|(\%a as lua expr\ mod \%b as lua expr\)
macro [- %a] =: ".."|-(\%a as lua expr\)
macro [not %a] =: ".."|not (\%a as lua expr\)
rule [%a == %b] =:
lua expr "((vars.a == vars.b) or compiler.utils.equivalent(vars.a, vars.b))"
rule [%a != %b] =:
lua expr "((vars.a ~= vars.b) or not compiler.utils.equivalent(vars.a, vars.b))"
macro [repr %obj] =:
".."|compiler.utils.repr(\%obj as lua expr\, true)
macro [say %str] =:
".."|compiler:writeln(compiler.utils.repr(\%str as lua expr\))
# Control flow
rule [do %action] =:
lua expr "vars.action(compiler, setmetatable({}, {__index=vars}))"
macro block [return %return_value] =:
lua block ".."
|if vars.return_value.type ~= "Thunk" then
| compiler:error("Assignment operation has the wrong type for the right hand side. "
| .."Expected Thunk, but got: "..vars.return_value.type.."\\nMaybe you used '=' instead of '=:'?")
|end
".."|do
| local ret
| \lua expr "compiler:tree_to_lua(vars.return_value.value, 'Statement')"\
| return ret
|end
macro block [return] =:
"return nil"
# Conditionals
macro block [if %condition %if_body] =:
".."|if \%condition as lua expr\ then
| \(lua expr "vars.if_body.value") as lua block\
|end
macro block [if %condition %if_body else %else_body] =:
".."|if \%condition as lua expr\ then
| \(lua expr "vars.if_body.value") as lua block\
|else
| \(lua expr "vars.else_body.value") as lua block\
|end
# Ternary operator
macro [%if_expr if %condition else %else_expr] =:
".."|(function(compiler, vars)
| if \%condition as lua expr\ then
| return \%if_expr as lua expr\
| else
| return \%else_expr as lua expr\
| end
|end)(compiler, vars)
# Switch statement/multi-branch if
macro block [when %body] =:
%result =: ""
%result
# Loop control flow
macro block [break] =: "break"
macro block [continue] =: "continue"
# TODO: add labeled break/continue?
# GOTOs
lua block ".."
|local function lua_label(label)
| if label.type ~= "Var" then
| compiler:error("Goto label has the wrong type for the label. Expected Var, but got: "..label.type)
| end
| local bits = "abcdefghijklmnop"
| local lua_identifier = "label_"
| for i=1,#label.value do
| local byte = string.byte(label.value, i)
| local low = byte % 16
| local high = (byte - low) / 16
| lua_identifier = lua_identifier .. bits:sub(low+1,low+1) .. bits:sub(high+1,high+1)
| end
| return lua_identifier
|end
|
|compiler:defmacro("-> %label", function(compiler, vars, kind)
| return "::"..lua_label(vars.label).."::", true
|end)
|compiler:defmacro("go to %label", function(compiler, vars, kind)
| return "goto "..lua_label(vars.label), true
|end)
# While loops
macro block [repeat %body] =:
".."|while true do
| \(lua expr "vars.body.value") as lua block\
|end
macro block [repeat while %condition %body] =:
".."|while \%condition as lua expr\ do
| \(lua expr "vars.body.value") as lua block\
|end
macro block [repeat until %condition %body] =:
".."|while not (\%condition as lua expr\) do
| \(lua expr "vars.body.value") as lua block\
|end
# For loops
macro block [for %var in %iterable %body] =:
%var-type =: lua expr "vars.var.type"
if (%var-type != "Var"):
error ".."
|For loop has the wrong type for the loop variable. Expected Var, but got: \%var-type\
%var-code =: %var as lua expr
".."|local old_loopval = \%var-code\
|for i,value in ipairs(\%iterable as lua expr\) do
| \%var-code\ = value
| \(lua expr "vars.body.value") as lua block\
|end
|\%var-code\ = old_loopval
macro block [for all %iterable %body] =:
".."|local old_loopval = vars.it
|for i,value in ipairs(\%iterable as lua expr\) do
| vars.it = value
| \(lua expr "vars.body.value") as lua block\
|end
|vars.it = old_loopval
# List Comprehension
# TODO: maybe make this lazy, or a lazy version?
macro [%expression for %var in %iterable] =:
%var-type =: lua expr "vars.var.type"
if (%var-type != "Var"):
error ".."
|List comprehension has the wrong type for the loop variable. Expected Var, but got: \%var-type\
%var-code =: %var as lua expr
".."|(function(game, vars)
| local comprehension = {}
| for i,value in ipairs(\%iterable as lua expr\) do
| \%var-code\ = value
| comprehension[i] = \%expression as lua expr\
| end
| return comprehension
|end)(game, setmetatable({}, {__index=vars}))
macro [%expression for all %iterable] =:
".."|(function(game, vars)
| local comprehension = {}
| for i,value in ipairs(\%iterable as lua expr\) do
| vars.it = value
| comprehension[i] = \%expression as lua expr\
| end
| return comprehension
|end)(game, setmetatable({}, {__index=vars}))
# Dict comprehension
macro [%key -> %value for %var in %iterable] =:
%var-type =: lua expr "vars.var.type"
if (%var-type != "Var"):
error ".."
|Dict comprehension has the wrong type for the loop variable. Expected Var, but got: \%var-type\
%var-code =: %var as lua expr
".."|(function(game, vars)
| local comprehension = {}
| for i,value in ipairs(\%iterable as lua expr\) do
| \%var-code\ = value
| comprehension[\%key as lua expr\] = \%value as lua expr\
| end
| return comprehension
|end)(game, setmetatable({}, {__index=vars}))
macro [%key -> %value for all %iterable] =:
".."|(function(game, vars)
| local comprehension = {}
| for i,value in ipairs(\%iterable as lua expr\) do
| vars.it = value
| comprehension[\%key as lua expr\] = \%value as lua expr\
| end
| return comprehension
|end)(game, setmetatable({}, {__index=vars}))
# Number ranges
rule [%start up to %stop] =:
lua expr "compiler.utils.range(vars.start,vars.stop-1)"
rule [%start thru %stop, %start through %stop] =:
lua expr "compiler.utils.range(vars.start,vars.stop)"
rule [%start down to %stop] =:
lua expr "compiler.utils.range(vars.start,vars.stop+1,-1)"
rule [%start down thru %stop, %start down through %stop] =:
lua expr "compiler.utils.range(vars.start,vars.stop,-1)"
rule [%start up to %stop via %step] =:
lua expr "compiler.utils.range(vars.start,vars.stop-1,vars.step)"
rule [%start thru %stop via %step, %start through %stop via %step] =:
lua expr "compiler.utils.range(vars.start,vars.stop,vars.step)"
rule [%start down to %stop via %step] =:
lua expr "compiler.utils.range(vars.start,vars.stop+1,-vars.step)"
rule [%start down thru %stop via %step, %start down through %stop via %step] =:
lua expr "compiler.utils.range(vars.start,vars.stop,-vars.step)"
# Common utility functions
rule [random number] =: lua expr "math.random()"
rule [sum of %items] =: lua expr "compiler.utils.sum(vars.items)"
rule [product of %items] =: lua expr "compiler.utils.product(vars.items)"
rule [all of %items] =: lua expr "compiler.utils.all(vars.items)"
rule [any of %items] =: lua expr "compiler.utils.any(vars.items)"
rule [avg of %items, average of %items] =:
lua expr "(compiler.utils.sum(vars.items)/#vars.items)"
rule [min of %items, smallest of %items, lowest of %items] =:
lua expr "compiler.utils.min(vars.items)"
rule [max of %items, biggest of %items, largest of %items, highest of %items] =:
lua expr "compiler.utils.min(vars.items)"
rule [min of %items with respect to %keys] =:
lua expr "compiler.utils.min(vars.items, vars.keys)"
rule [max of %items with respect to %keys] =:
lua expr "compiler.utils.max(vars.items, vars.keys)"
# List/dict functions
macro [..]
%list's %index, %index st in %list, %index nd in %list, %index rd in %list
%index th in %list, %index in %list, %list -> %index
..=:
".."|\%list as lua expr\[\%index as lua expr\]
macro block [..]
%list's %index = %new_value, %index st in %list = %new_value, %index nd in %list = %new_value
%index rd in %list = %new_value, %index th in %list = %new_value, %index in %list = %new_value
%list -> %index = %new_value
..=:
lua block ".."
|if vars.new_value.type ~= "Thunk" then
| compiler:error("Dict assignment operation has the wrong type for the right hand side. "
| .."Expected Thunk, but got: "..vars.new_value.type.."\\nMaybe you used '=' instead of '=:'?")
|end
".."|do
| local ret
| \lua expr "compiler:tree_to_lua(vars.new_value.value, 'Statement')"\
| \%list as lua expr\[\%index as lua expr\] = ret
|end
macro [append %item to %list, add %item to %list] =:
".."|table.insert(\%list as lua expr\, \%item as lua expr\)
rule [flatten %lists] =:
%flat =: []
for %list in %lists:
for %item in %list:
add %item to %flat
%flat
macro [%item is in %list, %list contains %item] =:
".."|(\%list as lua expr\[\%index as lua expr\] ~= nil)
macro [length of %list, size of %list, number of %list] =:
".."|#(\%list as lua expr\)
rule [dict %items] =:
%dict =: []
for %pair in %items:
lua block "vars.dict[vars.pair[1]] = vars.pair[2]"
return: %dict
rule [entries in %dict] =:
lua block ".."
|local items = {}
|for k,v in pairs(vars.dict) do
| table.insert(items, {key=k,value=v})
|end
|return items
# Permission functions
rule [restrict %fn to within %whitelist] =:
lua block ".."
|local fns = compiler:get_invocations(vars.fn)
|local whitelist = compiler:get_invocations(vars.whitelist)
|local whiteset = {}
|for _,w in ipairs(whitelist) do
| if not compiler.defs[w] then
| compiler:error("Undefined function: "..tostring(w))
| else whiteset[w] = true
| end
|end
|for _,fn in ipairs(fns) do
| local fn_info = compiler.defs[fn]
| if fn_info == nil then
| compiler:error("Undefined function: "..tostring(fn))
| elseif not compiler:check_permission(fn) then
| compiler:writeln("You do not have permission to restrict function: "..tostring(fn))
| else
| compiler.defs[fn].whiteset = whiteset
| end
|end
rule [allow %whitelist to use %fn] =:
lua block ".."
|local fns = compiler:get_invocations(vars.fn)
|local whitelist = compiler:get_invocations(vars.whitelist)
|for _,w in ipairs(whitelist) do
| if not compiler.defs[w] then
| compiler:error("Undefined function: "..tostring(w))
| end
|end
|for _,fn in ipairs(fns) do
| local fn_info = compiler.defs[fn]
| if fn_info == nil then
| compiler:error("Undefined function: "..tostring(fn))
| elseif fn_info.whiteset == nil then
| compiler:writeln("Function is already allowed by everyone: "..tostring(fn))
| elseif not compiler:check_permission(fn) then
| compiler:writeln("You do not have permission to grant permissions for function: "..tostring(fn))
| else
| for _,w in ipairs(whitelist) do
| fn_info.whiteset[w] = true
| end
| end
|end
rule [forbid %blacklist to use %fn] =:
lua block ".."
|local fns = compiler:get_invocations(vars.fn)
|local blacklist = compiler:get_invocations(vars.blacklist)
|for _,b in ipairs(blacklist) do
| if not compiler.defs[b] then
| compiler:error("Undefined function: "..tostring(b))
| end
|end
|for _,fn in ipairs(fns) do
| local fn_info = compiler.defs[fn]
| if fn_info == nil then
| compiler:error("Undefined function: "..tostring(fn))
| elseif fn_info.whiteset == nil then
| compiler:writeln("Cannot remove items from a whitelist when there is no whitelist on function: "..tostring(fn))
| elseif not compiler:check_permission(fn) then
| compiler:writeln("You do not have permission to restrict function: "..tostring(fn))
| else
| for _,b in ipairs(blacklist) do fn_info.whiteset[b] = nil end
| end
|end
# For unit testing
macro [parse tree %code] =:
lua expr "compiler.utils.repr(compiler:stringify_tree(vars.code.value), true)"
macro block [test %code yields %expected] =:
%generated =: lua expr "compiler.utils.repr(compiler:stringify_tree(vars.code.value), true)"
%expected =: %expected as lua expr
if (%generated != %expected):
say "Test failed!"
say "Expected:"
say %expected
say "But got:"
say %generated
error!
return: ""
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