Struct rustemo::lexer::Context

pub struct Context<'i, I: Input + ?Sized> {
    pub file: String,
    pub input: &'i I,
    pub position: usize,
    pub range: Range<usize>,
    pub location: Location,
    pub layout: Option<&'i I>,
    pub layout_ahead: Option<&'i I>,
}

Lexer context is used to keep the lexing state. It provides necessary information to parsers and actions.

Fields

file: String

File path of the parsed content. <str> In case of static string.

input: &'i I

The input being parsed. Should be set when the context is created.

position: usize

An absolute position in the input sequence

The input must be indexable type.

range: Range<usize>

The range of token/non-terminal during shift/reduce operation.

location: Location

Similar to position but has line/column format for text based inputs.

If this prove to be pricey overhead we might make tracking of this info configurable.

layout: Option<&'i I>

Layout before the current token (e.g. whitespaces, comments…)

layout_ahead: Option<&'i I>

Layout before the lookahead token (e.g. whitespaces, comments…)

Implementations

impl<'i, I: Input + ?Sized> Context<'i, I>

pub fn new(file: String, input: &'i I) -> Self

pub fn file(&self) -> String

pub fn location_str(&self) -> String

Trait Implementations

impl<'i, I: Debug + Input + ?Sized> Debug for Context<'i, I>

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

Formats the value using the given formatter.

impl<'i, I: Input + ?Sized> From<&mut Context<'i, I>> for Location

fn from(context: &mut Context<'_, I>) -> Self

Converts to this type from the input type.