protoc.lua support boolean constant

protoc.lua

@@ -255,12 +255,18 @@ function Lexer:array(opt)
 end
 
 function Lexer:constant(opt)
-   local c = self:full_ident('constant', 'opt') or
-             self:number('opt') or
-             self:quote('opt') or
-             self:structure('opt') or
-             self:array('opt')
-   if not c and not opt then
+   local c = self:full_ident('constant', 'opt')
+   if c == "true" then
+      c = true
+   elseif c == "false" then
+      c = false
+   elseif c == nil then
+      c = self:number('opt') or
+         self:quote('opt') or
+         self:structure('opt') or
+         self:array('opt')
+   end
+   if c == nil and not opt then
       return self:error "constant expected"
    end
    return c
@@ -459,9 +465,6 @@ local function field(self, lex, ident)
    if options then
       info.default_value, options.default = tostring(options.default), nil
       info.json_name, options.json_name = options.json_name, nil
-      if options.packed and options.packed == "false" then
-         options.packed = false
-      end
       info.options = options
    end
    if info.number <= 0 then

test.lua

@@ -605,9 +605,12 @@ function _G.test_packed()
       message MyMessage
       {
           repeated int32 intList = 1;
+          repeated int32 nopacks = 2 [packed=false];
       } ]]
    local b = pb.encode("MyMessage", { intList = { 1,2,3 } })
    eq(pb.tohex(b), "0A 03 01 02 03")
+   local b = pb.encode("MyMessage", { nopacks = { 1,2,3 } })
+   eq(pb.tohex(b), "10 01 10 02 10 03")
 
    check_load [[
       syntax="proto3";