Update rust generator for no_std

Also re-run generator on sample.

Author: jrobsonchase

samples/monster_generated.rs

@@ -1,34 +1,44 @@
 // automatically generated by the FlatBuffers compiler, do not modify
 
 
+
+extern crate core;
+
+use core::mem;
+use core::cmp::Ordering;
+
+extern crate flatbuffers;
+use self::flatbuffers::EndianScalar;
+
+#[allow(unused_imports, dead_code)]
 pub mod my_game {
-  #![allow(dead_code)]
-  #![allow(unused_imports)]
 
-  use std::mem;
-  use std::marker::PhantomData;
-  use std::cmp::Ordering;
+  extern crate core;
+
+  use core::mem;
+  use core::cmp::Ordering;
 
   extern crate flatbuffers;
   use self::flatbuffers::EndianScalar;
+#[allow(unused_imports, dead_code)]
 pub mod sample {
-  #![allow(dead_code)]
-  #![allow(unused_imports)]
 
-  use std::mem;
-  use std::marker::PhantomData;
-  use std::cmp::Ordering;
+  extern crate core;
+
+  use core::mem;
+  use core::cmp::Ordering;
 
   extern crate flatbuffers;
   use self::flatbuffers::EndianScalar;
 
 #[allow(non_camel_case_types)]
 #[repr(i8)]
-#[derive(Clone, Copy, PartialEq, Debug)]
+#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
 pub enum Color {
   Red = 0,
   Green = 1,
-  Blue = 2
+  Blue = 2,
+
 }
 
 const ENUM_MIN_COLOR: i8 = 0;
@@ -80,16 +90,17 @@ const ENUM_NAMES_COLOR:[&'static str; 3] = [
 ];
 
 pub fn enum_name_color(e: Color) -> &'static str {
-  let index: usize = e as usize;
-  ENUM_NAMES_COLOR[index]
+  let index = e as i8;
+  ENUM_NAMES_COLOR[index as usize]
 }
 
 #[allow(non_camel_case_types)]
 #[repr(u8)]
-#[derive(Clone, Copy, PartialEq, Debug)]
+#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
 pub enum Equipment {
   NONE = 0,
-  Weapon = 1
+  Weapon = 1,
+
 }
 
 const ENUM_MIN_EQUIPMENT: u8 = 0;
@@ -139,8 +150,8 @@ const ENUM_NAMES_EQUIPMENT:[&'static str; 2] = [
 ];
 
 pub fn enum_name_equipment(e: Equipment) -> &'static str {
-  let index: usize = e as usize;
-  ENUM_NAMES_EQUIPMENT[index]
+  let index = e as u8;
+  ENUM_NAMES_EQUIPMENT[index as usize]
 }
 
 pub struct EquipmentUnionTableOffset {}
@@ -158,7 +169,6 @@ impl<'a> flatbuffers::Follow<'a> for Vec3 {
   #[inline]
   fn follow(buf: &'a [u8], loc: usize) -> Self::Inner {
     <&'a Vec3>::follow(buf, loc)
-    //flatbuffers::follow_cast_ref::<Vec3>(buf, loc)
   }
 }
 impl<'a> flatbuffers::Follow<'a> for &'a Vec3 {
@@ -173,7 +183,7 @@ impl<'b> flatbuffers::Push for Vec3 {
     #[inline]
     fn push(&self, dst: &mut [u8], _rest: &[u8]) {
         let src = unsafe {
-            ::std::slice::from_raw_parts(self as *const Vec3 as *const u8, Self::size())
+            ::core::slice::from_raw_parts(self as *const Vec3 as *const u8, Self::size())
         };
         dst.copy_from_slice(src);
     }
@@ -184,7 +194,7 @@ impl<'b> flatbuffers::Push for &'b Vec3 {
     #[inline]
     fn push(&self, dst: &mut [u8], _rest: &[u8]) {
         let src = unsafe {
-            ::std::slice::from_raw_parts(*self as *const Vec3 as *const u8, Self::size())
+            ::core::slice::from_raw_parts(*self as *const Vec3 as *const u8, Self::size())
         };
         dst.copy_from_slice(src);
     }
@@ -240,6 +250,7 @@ impl<'a> Monster<'a> {
         _fbb: &'mut_bldr mut flatbuffers::FlatBufferBuilder<'bldr>,
         args: &'args MonsterArgs<'args>) -> flatbuffers::WIPOffset<Monster<'bldr>> {
       let mut builder = MonsterBuilder::new(_fbb);
+      if let Some(x) = args.path { builder.add_path(x); }
       if let Some(x) = args.equipped { builder.add_equipped(x); }
       if let Some(x) = args.weapons { builder.add_weapons(x); }
       if let Some(x) = args.inventory { builder.add_inventory(x); }
@@ -261,46 +272,51 @@ impl<'a> Monster<'a> {
     pub const VT_WEAPONS: flatbuffers::VOffsetT = 18;
     pub const VT_EQUIPPED_TYPE: flatbuffers::VOffsetT = 20;
     pub const VT_EQUIPPED: flatbuffers::VOffsetT = 22;
+    pub const VT_PATH: flatbuffers::VOffsetT = 24;
 
   #[inline]
-  pub fn pos(&'a self) -> Option<&'a Vec3> {
+  pub fn pos(&self) -> Option<&'a Vec3> {
     self._tab.get::<Vec3>(Monster::VT_POS, None)
   }
   #[inline]
-  pub fn mana(&'a self) -> i16 {
+  pub fn mana(&self) -> i16 {
     self._tab.get::<i16>(Monster::VT_MANA, Some(150)).unwrap()
   }
   #[inline]
-  pub fn hp(&'a self) -> i16 {
+  pub fn hp(&self) -> i16 {
     self._tab.get::<i16>(Monster::VT_HP, Some(100)).unwrap()
   }
   #[inline]
-  pub fn name(&'a self) -> Option<&'a str> {
+  pub fn name(&self) -> Option<&'a str> {
     self._tab.get::<flatbuffers::ForwardsUOffset<&str>>(Monster::VT_NAME, None)
   }
   #[inline]
-  pub fn inventory(&'a self) -> Option<&'a [u8]> {
+  pub fn inventory(&self) -> Option<&'a [u8]> {
     self._tab.get::<flatbuffers::ForwardsUOffset<flatbuffers::Vector<'a, u8>>>(Monster::VT_INVENTORY, None).map(|v| v.safe_slice())
   }
   #[inline]
-  pub fn color(&'a self) -> Color {
+  pub fn color(&self) -> Color {
     self._tab.get::<Color>(Monster::VT_COLOR, Some(Color::Blue)).unwrap()
   }
   #[inline]
-  pub fn weapons(&'a self) -> Option<flatbuffers::Vector<flatbuffers::ForwardsUOffset<Weapon<'a>>>> {
+  pub fn weapons(&self) -> Option<flatbuffers::Vector<'a, flatbuffers::ForwardsUOffset<Weapon<'a>>>> {
     self._tab.get::<flatbuffers::ForwardsUOffset<flatbuffers::Vector<flatbuffers::ForwardsUOffset<Weapon<'a>>>>>(Monster::VT_WEAPONS, None)
   }
   #[inline]
-  pub fn equipped_type(&'a self) -> Equipment {
+  pub fn equipped_type(&self) -> Equipment {
     self._tab.get::<Equipment>(Monster::VT_EQUIPPED_TYPE, Some(Equipment::NONE)).unwrap()
   }
   #[inline]
-  pub fn equipped(&'a self) -> Option<flatbuffers::Table<'a>> {
+  pub fn equipped(&self) -> Option<flatbuffers::Table<'a>> {
     self._tab.get::<flatbuffers::ForwardsUOffset<flatbuffers::Table<'a>>>(Monster::VT_EQUIPPED, None)
   }
   #[inline]
+  pub fn path(&self) -> Option<&'a [Vec3]> {
+    self._tab.get::<flatbuffers::ForwardsUOffset<flatbuffers::Vector<Vec3>>>(Monster::VT_PATH, None).map(|v| v.safe_slice() )
+  }
+  #[inline]
   #[allow(non_snake_case)]
-  pub fn equipped_as_weapon(&'a self) -> Option<Weapon> {
+  pub fn equipped_as_weapon(&self) -> Option<Weapon<'a>> {
     if self.equipped_type() == Equipment::Weapon {
       self.equipped().map(|u| Weapon::init_from_table(u))
     } else {
@@ -320,6 +336,7 @@ pub struct MonsterArgs<'a> {
     pub weapons: Option<flatbuffers::WIPOffset<flatbuffers::Vector<'a , flatbuffers::ForwardsUOffset<Weapon<'a >>>>>,
     pub equipped_type: Equipment,
     pub equipped: Option<flatbuffers::WIPOffset<flatbuffers::UnionWIPOffset>>,
+    pub path: Option<flatbuffers::WIPOffset<flatbuffers::Vector<'a , Vec3>>>,
 }
 impl<'a> Default for MonsterArgs<'a> {
     #[inline]
@@ -334,6 +351,7 @@ impl<'a> Default for MonsterArgs<'a> {
             weapons: None,
             equipped_type: Equipment::NONE,
             equipped: None,
+            path: None,
         }
     }
 }
@@ -379,6 +397,10 @@ impl<'a: 'b, 'b> MonsterBuilder<'a, 'b> {
     self.fbb_.push_slot_always::<flatbuffers::WIPOffset<_>>(Monster::VT_EQUIPPED, equipped);
   }
   #[inline]
+  pub fn add_path(&mut self, path: flatbuffers::WIPOffset<flatbuffers::Vector<'b , Vec3>>) {
+    self.fbb_.push_slot_always::<flatbuffers::WIPOffset<_>>(Monster::VT_PATH, path);
+  }
+  #[inline]
   pub fn new(_fbb: &'b mut flatbuffers::FlatBufferBuilder<'a>) -> MonsterBuilder<'a, 'b> {
     let start = _fbb.start_table();
     MonsterBuilder {
@@ -431,11 +453,11 @@ impl<'a> Weapon<'a> {
     pub const VT_DAMAGE: flatbuffers::VOffsetT = 6;
 
   #[inline]
-  pub fn name(&'a self) -> Option<&'a str> {
+  pub fn name(&self) -> Option<&'a str> {
     self._tab.get::<flatbuffers::ForwardsUOffset<&str>>(Weapon::VT_NAME, None)
   }
   #[inline]
-  pub fn damage(&'a self) -> i16 {
+  pub fn damage(&self) -> i16 {
     self._tab.get::<i16>(Weapon::VT_DAMAGE, Some(0)).unwrap()
   }
 }

src/idl_gen_rust.cpp

@@ -256,6 +256,7 @@ class RustGenerator : public BaseGenerator {
       "yield",
 
       // other rust terms we should not use
+      "core",
       "std",
       "usize",
       "isize",
@@ -1477,7 +1478,7 @@ class RustGenerator : public BaseGenerator {
     code_ += "";
     code_ += "  #[inline]";
     code_ += "  pub fn key_compare_with_value(&self, val: {{KEY_TYPE}}) -> "
-             " ::std::cmp::Ordering {";
+             " ::core::cmp::Ordering {";
     code_ += "    let key = self.{{FIELD_NAME}}();";
     code_ += "    key.cmp(&val)";
     code_ += "  }";
@@ -1648,7 +1649,7 @@ class RustGenerator : public BaseGenerator {
     code_ += "    #[inline]";
     code_ += "    fn push(&self, dst: &mut [u8], _rest: &[u8]) {";
     code_ += "        let src = unsafe {";
-    code_ += "            ::std::slice::from_raw_parts("
+    code_ += "            ::core::slice::from_raw_parts("
              "self as *const {{STRUCT_NAME}} as *const u8, Self::size())";
     code_ += "        };";
     code_ += "        dst.copy_from_slice(src);";
@@ -1660,7 +1661,7 @@ class RustGenerator : public BaseGenerator {
     code_ += "    #[inline]";
     code_ += "    fn push(&self, dst: &mut [u8], _rest: &[u8]) {";
     code_ += "        let src = unsafe {";
-    code_ += "            ::std::slice::from_raw_parts("
+    code_ += "            ::core::slice::from_raw_parts("
              "*self as *const {{STRUCT_NAME}} as *const u8, Self::size())";
     code_ += "        };";
     code_ += "        dst.copy_from_slice(src);";
@@ -1746,8 +1747,10 @@ class RustGenerator : public BaseGenerator {
   void GenNamespaceImports(const int white_spaces) {
       std::string indent = std::string(white_spaces, ' ');
       code_ += "";
-      code_ += indent + "use std::mem;";
-      code_ += indent + "use std::cmp::Ordering;";
+      code_ += indent + "extern crate core;";
+      code_ += "";
+      code_ += indent + "use core::mem;";
+      code_ += indent + "use core::cmp::Ordering;";
       code_ += "";
       code_ += indent + "extern crate flatbuffers;";
       code_ += indent + "use self::flatbuffers::EndianScalar;";