Struct pm_lex_callback_t

#[repr(C)]
pub struct pm_lex_callback_t {
    pub data: *mut c_void,
    pub callback: Option<unsafe extern "C" fn(data: *mut c_void, parser: *mut pm_parser_t, token: *mut pm_token_t)>,
}

When you are lexing through a file, the lexer needs all of the information that the parser additionally provides (for example, the local table). So if you want to properly lex Ruby, you need to actually lex it in the context of the parser. In order to provide this functionality, we optionally allow a struct to be attached to the parser that calls back out to a user-provided callback when each token is lexed.

Fields

data: *mut c_void

This opaque pointer is used to provide whatever information the user deemed necessary to the callback. In our case we use it to pass the array that the tokens get appended into.

callback: Option<unsafe extern "C" fn(data: *mut c_void, parser: *mut pm_parser_t, token: *mut pm_token_t)>

This is the callback that is called when a token is lexed. It is passed the opaque data pointer, the parser, and the token that was lexed.

Trait Implementations

impl Clone for pm_lex_callback_t

fn clone(&self) -> pm_lex_callback_t

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for pm_lex_callback_t

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for pm_lex_callback_t

fn default() -> Self

Returns the “default value” for a type.

impl Copy for pm_lex_callback_t