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use lua::{Index, ToLua, FromLua, State, Type};
use types::{LuaStackable, LuaGeneric};
use context::Context;
/// Represents a Lua table on the Lua stack.
pub struct LuaTable {
index: Index
}
impl LuaTable {
/// Create a new LuaTable at the given index.
pub fn new(i: Index) -> LuaTable {
LuaTable {
index: i
}
}
/// Set this table's metatable.
///
/// Equivalent to the Lua `setmetatable` function
pub fn set_metatable(&self, context: &mut Context, meta: &LuaTable) {
context.get_state().push_value(meta.get_pos());
context.get_state().set_metatable(self.get_pos());
}
/// Set a value in this table
/// May call the __newindex metamethod
///
/// Equivalent to `table[key] = value` in Lua
pub fn set(&self, context: &mut Context, key: &ToLua, value: &ToLua) {
key.to_lua(context.get_state());
value.to_lua(context.get_state());
context.get_state().set_table(self.get_pos());
}
/// Set a value in this table without invoking metamethods
///
/// Equivalent to the Lua `rawset` function
pub fn set_raw(&self, context: &mut Context, key: &ToLua, value: &ToLua) {
key.to_lua(context.get_state());
value.to_lua(context.get_state());
context.get_state().raw_set(self.get_pos());
}
/// Get a value from this table
/// May call the __index metamethod
///
/// Equivalent to `table[key]` in Lua
pub fn get(&self, context: &mut Context, key: &ToLua) -> LuaGeneric {
key.to_lua(context.get_state());
context.get_state().get_table(self.get_pos());
LuaGeneric::new(context.get_state().get_top())
}
/// Get a value from this table without invoking metamethods
///
/// Equivalent to the Lua `rawget` function
pub fn get_raw(&self, context: &mut Context, key: &ToLua) -> LuaGeneric {
key.to_lua(context.get_state());
context.get_state().raw_get(self.get_pos());
LuaGeneric::new(context.get_state().get_top())
}
/// Get a value from this table as type T
pub fn get_typed<T: FromLua>(&self, context: &mut Context, key: &ToLua) -> Option<T> {
key.to_lua(context.get_state());
context.get_state().get_table(self.get_pos());
let top = context.get_state().get_top();
let ret = context.get_state().to_type(top);
ret
}
/// Count the number of elements in this table as an array
/// May call the `__len` metamethod
///
/// Equivalent to the Lua `#` operator
///
/// # Panics
///
/// This method will panic if this table has a `__len`
/// metamethod that does not return an integer
pub fn len(&self, context: &mut Context) -> i64 {
context.get_state().len_direct(self.get_pos())
}
/// Count the number of elements in this table as an array without calling the `__len` metamethod
///
/// Equivalent to the Lua `rawlen` function
pub fn len_raw(&self, context: &mut Context) -> usize {
context.get_state().raw_len(self.get_pos())
}
/// Iterate through every (i, value) pair where i is an integer and is continuous from 1 to
/// this table's length.
///
/// Similar to the Lua `ipairs` function
pub fn iter_array<F>(&self, context: &mut Context, mut func: F)
where F: FnMut(Context, i64, LuaGeneric) {
for key in 1.. {
let mut new_context = context.push_context();
let value = self.get(&mut new_context, &key);
let t = value.type_of(&mut new_context);
match t {
Type::Nil => break,
_ => func(new_context, key, value)
};
}
}
/// Add an element to the end of the table
///
/// Equivalent to the Lua `table.insert` function
pub fn append(&self, context: &mut Context, value: &ToLua) {
let length = self.len_raw(context);
self.set(context, &(length as i64+1), value);
}
}
impl LuaStackable for LuaTable {
fn get_pos(&self) -> Index {
self.index
}
}
impl ToLua for LuaTable {
fn to_lua(&self, state: &mut State) {
state.push_value(self.get_pos());
}
}
impl FromLua for LuaTable {
fn from_lua(state: &mut State, index: Index) -> Option<LuaTable> {
if state.is_table(index) {
Some(LuaTable::new(index))
} else {
None
}
}
}