Struct Lexer 

pub struct Lexer<'a> { /* private fields */ }

Lexer has functionality to jump around and traverse the PDF lexemes of a string in any direction.

Implementations

impl<'a> Lexer<'a>

pub fn new(buf: &'a [u8]) -> Lexer<'a>

pub fn with_offset(buf: &'a [u8], file_offset: usize) -> Lexer<'a>

pub fn next(&mut self) -> Result<Substr<'a>>

Returns next lexeme. Lexer moves to the next byte after the lexeme. (needs to be tested)

pub fn next_stream(&mut self) -> Result<()>

consume the whitespace sequence following the stream start

pub fn back(&mut self) -> Result<Substr<'a>>

Gives previous lexeme. Lexer moves to the first byte of this lexeme. (needs to be tested)

pub fn peek(&self) -> Result<Substr<'a>>

Look at the next lexeme. Will return empty substr if the next character is EOF.

pub fn next_expect(&mut self, expected: &'static str) -> Result<()>

Returns Ok if the next lexeme matches expected - else Err.

pub fn next_as<T>(&mut self) -> Result<T>

where T: FromStr, T::Err: Error + Send + Sync + 'static,

pub fn get_pos(&self) -> usize

pub fn new_substr(&self, range: Range<usize>) -> Substr<'a>

pub fn set_pos(&mut self, wanted_pos: usize) -> Substr<'a>

Just a helper function for set_pos, set_pos_from_end and offset_pos.

pub fn set_pos_from_end(&mut self, new_pos: usize) -> Substr<'a>

Returns the substr between the old and new positions

pub fn offset_pos(&mut self, offset: usize) -> Substr<'a>

Returns the substr between the old and new positions

pub fn seek_newline(&mut self) -> Substr<'_>

Moves pos to start of next line. Returns the skipped-over substring.

pub fn seek_substr(&mut self, substr: impl AsRef<[u8]>) -> Option<Substr<'a>>

Moves pos to after the found substr. Returns Substr with traversed text if substr is found.

pub fn seek_substr_back(&mut self, substr: &[u8]) -> Result<Substr<'a>>

Searches for string backward. Moves to after the found substr, returns the traversed Substr if found.

pub fn read_n(&mut self, n: usize) -> Substr<'a>

Read and return slice of at most n bytes.

pub fn get_remaining_slice(&self) -> &'a [u8]

Returns slice from current position to end.

pub fn ctx(&self) -> Cow<'_, str>

for debugging

Trait Implementations

impl<'a> Clone for Lexer<'a>

fn clone(&self) -> Lexer<'a>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Copy for Lexer<'a>