if statement decorator, unary ops, ... keyword

moonscript/compile.lua

@@ -388,6 +388,21 @@ local compiler_index = {
 		return node
 	end,
 
+	minus = function(self, node)
+		local _, value = unpack(node)
+		return "-"..self:value(value)
+	end,
+
+	length = function(self, node)
+		local _, value = unpack(node)
+		return "#"..self:value(value)
+	end,
+
+	["not"] = function(self, node)
+		local _, value = unpack(node)
+		return "not "..self:value(value)
+	end,
+
 	self = function(self, node)
 		local _, val = unpack(node)
 		return "self."..self:value(val)

moonscript/parse.lua

@@ -168,7 +168,7 @@ local build_grammar = wrap(function()
 		return false
 	end
 
-	local Name = sym"@" * Name / mark"self" + Name
+	local Name = sym"@" * Name / mark"self" + Name + "..."
 
 	-- make sure name is not a keyword
 	local Name = Cmt(Name, function(str, pos, name)
@@ -180,6 +180,16 @@ local build_grammar = wrap(function()
 		return C(symx(delim)) * C((P('\\'..delim) + (1 - S('\n'..delim)))^0) * sym(delim) / mark"string"
 	end
 
+	-- wrap if statement if there is a conditional decorator
+	local function wrap_if(stm, cond)
+		if cond then
+			local pass, fail = unpack(cond)
+			if fail then fail = {"else", {fail}} end
+			return {"if", cond[2], {stm}, fail}
+		end
+		return stm
+	end
+
 	local function check_lua_string(str, pos, right, left)
 		return #left == #right
 	end
@@ -189,7 +199,9 @@ local build_grammar = wrap(function()
 		File = Block + Ct"",
 		Block = Ct(Line * (Break^1 * Line)^0),
 		Line = Cmt(Indent, check_indent) * Statement + _Space * Comment,
-		Statement = Import + If + While + Exp * Space,
+
+		Statement = (Import + If + While + Exp * Space) *
+			(key"if" * Exp * (key"else" * Exp)^-1 * Space / mark"if")^-1 / wrap_if,
 
 		Body = Break * InBlock + Ct(Statement),
 
@@ -225,7 +237,11 @@ local build_grammar = wrap(function()
 		Factor = Ct(Term * (FactorOp * Term)^0) / flatten_or_mark"exp",
 		Term = Ct(Value * (TermOp * Value)^0) / flatten_or_mark"exp",
 
-		Value = TableLit +
+		Value =
+			sym"-" * Exp / mark"minus" +
+			sym"#" * Exp / mark"length" +
+			sym"not" * Exp / mark"not" +
+			TableLit +
 			Comprehension +
 			ColonChain +
 			Ct(KeyValueList) / mark"table" +

tests/inputs/syntax.moon

@@ -101,8 +101,33 @@ argon:world().something()
 
 argon:somethin"200".world(1,2)
 
+x = -434
+
+x = -hello world one two
+
+hi = -"herfef"
+
+x = -[x for x in x]
+
+print "hello" if cool
+
+print "nutjob"
+
+if hello then 343
+
+print "what" if cool else whack
+
+arg = {...}
+
+x = (...) ->
+  dump {...}
 
 
+x = not true
+
+y = not(5+5)
 
 
+y = #"hello"
 
+x = #{#{},#{1},#{1,2}}

tests/outputs/syntax.lua

@@ -56,4 +56,34 @@ local argon = { num = 100, world = function(self)
   end }
 something.what()
 argon:world().something()
-argon:somethin("200").world(1, 2)
+argon:somethin("200").world(1, 2)
+x = -434
+x = -hello(world(one(two)))
+local hi = -"herfef"
+x = -(function()
+  local tmp = {}
+  for x in x do
+    table.insert(tmp, x)
+  end
+  return tmp
+end)()
+if cool then
+  print("hello")
+else
+  cool
+end
+print("nutjob")
+if hello then
+  343
+end
+if cool then
+  print("what")
+else
+  cool
+end
+local arg = { ... }
+x = function(...) dump({ ... }) end
+x = not true
+local y = not (5 + 5)
+y = #"hello"
+x = #{ #{  }, #{ 1 }, #{ 1, 2 } }