conds and while

moonscript/compile.lua

@@ -91,9 +91,39 @@ local compiler_index = {
 	end,
 
 	["if"] = function(self, node)
+		local cond, block = node[2], node[3]
+		local ichr = self:ichar()
+
+		local out = {
+			("if %s then"):format(self:value(cond)),
+			self:block(block, 1)
+		}
+
+		for i = 4,#node do
+			local clause = node[i]
+			local block
+			if clause[1] == "else" then
+				table.insert(out, ichr.."else")
+				block = clause[2]
+			elseif clause[1] == "elseif" then
+				table.insert(out, ichr.."elseif "..self:value(clause[2]).." then")
+				block = clause[3]
+			else
+				error("Unknown if clause: "..clause[1])
+			end
+			table.insert(out, self:block(block, 1))
+		end
+
+		table.insert(out, ichr.."end")
+
+		return table.concat(out, "\n")
+	end,
+
+	['while'] = function(self, node)
 		local _, cond, block = unpack(node)
-		return ("if %s then\n%s\n%send"):format(
-			self:value(cond), self:block(block, 1), self:ichar())
+		local ichr = self:ichar()
+
+		return ("while %s do\n%s\n%send"):format(self:value(cond), self:block(block, 1), ichr)
 	end,
 
 	block = function(self, node, inc)

moonscript/parse.lua

@@ -177,14 +177,18 @@ local build_grammar = wrap(function()
 		File = Block + Ct"",
 		Block = Ct(Line * (Break^1 * Line)^0),
 		Line = Cmt(Indent, check_indent) * Statement + _Space * Comment,
-		Statement = Ct(If) + Exp * Space,
+		Statement = If + While + Exp * Space,
 
 		Body = Break * InBlock + Ct(Statement),
 
 		InBlock = #Cmt(Indent, advance_indent) * Block * OutBlock,
 		OutBlock = Cmt("", pop_indent),
 
-		If = key"if" * Exp * Body / mark"if",
+		If = key"if" * Exp * key"then"^-1 * Body *
+			((Break * Cmt(Indent, check_indent))^-1 * key"elseif" * Exp * key"then"^-1 * Body / mark"elseif")^0 *
+			((Break * Cmt(Indent, check_indent))^-1 * key"else" * Body / mark"else")^-1 / mark"if",
+
+		While = key"while" * Exp * key"do"^-1 * Body / mark"while",
 
 		Assign = Ct(AssignableList) * sym"=" * Ct(TableBlock + ExpList) / mark"assign",
 

tests/inputs/cond.moon

@@ -0,0 +1,63 @@
+
+you_cool = false
+
+if cool
+  if you_cool
+    one
+  else if eatdic
+    yeah
+  else
+    two
+    three
+else
+  no
+
+if cool then no
+if cool then no else yes
+
+if cool then wow cool else
+  noso cool
+
+if working
+  if cool then if cool then okay else what else nah
+
+while true do print "name"
+
+while 5 + 5
+  print "okay world"
+  working man
+
+while also do
+  i work too
+  "okay"
+
+
+if yeah then no day elseif cool me then okay ya else u way
+if yeah then no dad else if cool you then okay bah else p way
+
+
+if (->)() then what ever
+
+if nil then flip me else
+  it be,rad
+
+
+if things great then no way elseif okay sure
+  what here
+
+
+if things then no chance
+elseif okay
+  what now
+
+
+if things
+  yes man
+elseif okay person then hi there else hmm sure
+
+if lets go
+  print "greetings"
+elseif "just us"
+  print "will smith" else show 5555555
+
+

tests/outputs/cond.lua

@@ -0,0 +1,98 @@
+local you_cool = false
+if cool then
+  if you_cool then
+    one
+  else
+    if eatdic then
+      yeah
+    else
+      two
+      three
+    end
+  end
+else
+  no
+end
+if cool then
+  no
+end
+if cool then
+  no
+else
+  yes
+end
+if cool then
+  wow(cool)
+else
+  noso(cool)
+end
+if working then
+  if cool then
+    if cool then
+      okay
+    else
+      what
+    end
+  else
+    nah
+  end
+end
+while true do
+  print("name")
+end
+while 5 + 5 do
+  print("okay world")
+  working(man)
+end
+while also do
+  i(work(too))
+  "okay"
+end
+if yeah then
+  no(day)
+elseif cool(me) then
+  okay(ya)
+else
+  u(way)
+end
+if yeah then
+  no(dad)
+else
+  if cool(you) then
+    okay(bah)
+  else
+    p(way)
+  end
+end
+if (function() end)() then
+  what(ever)
+end
+if nil then
+  flip(me)
+else
+  it(be, rad)
+end
+if things(great) then
+  no(way)
+elseif okay(sure) then
+  what(here)
+end
+if things then
+  no(chance)
+elseif okay then
+  what(now)
+end
+if things then
+  yes(man)
+elseif okay(person) then
+  hi(there)
+else
+  hmm(sure)
+end
+if lets(go) then
+  print("greetings")
+elseif "just us" then
+  print("will smith")
+else
+  show(5555555)
+end