Trait mlua::serde::LuaSerdeExt [−][src]
This is supported on crate feature
serialize
only.Required methods
fn null(&'lua self) -> Result<Value<'lua>>
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A special value (lightuserdata) to encode/decode optional (none) values.
Requires feature = "serialize"
Example
use std::collections::HashMap; use mlua::{Lua, Result, LuaSerdeExt}; fn main() -> Result<()> { let lua = Lua::new(); lua.globals().set("null", lua.null()?)?; let val = lua.load(r#"{a = null}"#).eval()?; let map: HashMap<String, Option<String>> = lua.from_value(val)?; assert_eq!(map["a"], None); Ok(()) }
fn array_metatable(&'lua self) -> Result<Table<'lua>>
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A metatable attachable to a Lua table to systematically encode it as Array (instead of Map).
As result, encoded Array will contain only sequence part of the table, with the same length
as the #
operator on that table.
Requires feature = "serialize"
Example
use mlua::{Lua, Result, LuaSerdeExt}; use serde_json::Value as JsonValue; fn main() -> Result<()> { let lua = Lua::new(); lua.globals().set("array_mt", lua.array_metatable()?)?; // Encode as an empty array (no sequence part in the lua table) let val = lua.load("setmetatable({a = 5}, array_mt)").eval()?; let j: JsonValue = lua.from_value(val)?; assert_eq!(j.to_string(), "[]"); // Encode as object let val = lua.load("{a = 5}").eval()?; let j: JsonValue = lua.from_value(val)?; assert_eq!(j.to_string(), r#"{"a":5}"#); Ok(()) }
fn to_value<T: Serialize + ?Sized>(&'lua self, t: &T) -> Result<Value<'lua>>
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Converts T
into a Value
instance.
Requires feature = "serialize"
Example
use mlua::{Lua, Result, LuaSerdeExt}; use serde::Serialize; #[derive(Serialize)] struct User { name: String, age: u8, } fn main() -> Result<()> { let lua = Lua::new(); let u = User { name: "John Smith".into(), age: 20, }; lua.globals().set("user", lua.to_value(&u)?)?; lua.load(r#" assert(user["name"] == "John Smith") assert(user["age"] == 20) "#).exec() }
fn from_value<T: Deserialize<'lua>>(&'lua self, value: Value<'lua>) -> Result<T>
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Deserializes a Value
into any serde deserializable object.
Requires feature = "serialize"
Example
use mlua::{Lua, Result, LuaSerdeExt}; use serde::Deserialize; #[derive(Deserialize, Debug, PartialEq)] struct User { name: String, age: u8, } fn main() -> Result<()> { let lua = Lua::new(); let val = lua.load(r#"{name = "John Smith", age = 20}"#).eval()?; let u: User = lua.from_value(val)?; assert_eq!(u, User { name: "John Smith".into(), age: 20 }); Ok(()) }