Lua 5.2

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Feature Flag

[dependencies]
full_moon = { version = "2.1", features = ["lua52"] }

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Version-Specific Nodes

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Goto

pub struct Goto {
    pub(crate) goto_token: TokenReference,
    pub(crate) label_name: TokenReference,
}

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Methods

• new(label_name: TokenReference) -> Self - Creates a new Goto with the given label name
• goto_token(&self) -> &TokenReference - The goto symbol
• label_name(&self) -> &TokenReference - The label name
• with_goto_token(self, goto_token: TokenReference) -> Self - Returns a new Goto with the given goto token
• with_label_name(self, label_name: TokenReference) -> Self - Returns a new Goto with the given label name

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Example

goto cleanup
print("This won't execute")

::cleanup::
print("Jumped to cleanup")

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Label

pub struct Label {
    pub(crate) left_colons: TokenReference,
    pub(crate) name: TokenReference,
    pub(crate) right_colons: TokenReference,
}

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Methods

• new(name: TokenReference) -> Self - Creates a new Label with the given name
• left_colons(&self) -> &TokenReference - The :: symbol on the left
• name(&self) -> &TokenReference - The label name
• right_colons(&self) -> &TokenReference - The :: symbol on the right
• with_left_colons(self, left_colons: TokenReference) -> Self - Returns a new Label with the given left colons
• with_name(self, name: TokenReference) -> Self - Returns a new Label with the given name
• with_right_colons(self, right_colons: TokenReference) -> Self - Returns a new Label with the given right colons

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Example

::start::
local x = 1

::loop::
x = x + 1
if x < 10 then
  goto loop
end

::done::
print("Finished")

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Usage

use full_moon::parse;
use full_moon::ast::lua52::{Goto, Label};

let ast = parse(r#"
  goto skip
  print("skipped")
  ::skip::
  print("executed")
"#)?;

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Notes

• Labels must be enclosed in double colons: ::label::
• Goto statements can only jump to labels within the same function scope
• You cannot jump into the scope of a local variable
• Lua 5.2 also includes other features like \z escape sequences in strings and fractional hexadecimal numbers, which are automatically supported when the lua52 feature is enabled