Struct Tape

pub struct Tape<'a> {
    elements: &'a [TapeElement],
    strings: &'a str,
    string_offsets: &'a [usize],
    num_rows: usize,
}

A decoded JSON tape

String and numeric data is stored alongside an array of TapeElement

The first element is always TapeElement::Null

This approach to decoding JSON is inspired by simdjson

Fields

elements: &'a [TapeElement]

strings: &'a str

string_offsets: &'a [usize]

num_rows: usize

Implementations

impl<'a> Tape<'a>

pub fn get_string(&self, idx: u32) -> &'a str

Returns the string for the given string index

pub fn get(&self, idx: u32) -> TapeElement

Returns the tape element at idx

pub fn next(&self, cur_idx: u32, expected: &str) -> Result<u32, ArrowError>

Returns the index of the next field at the same level as cur_idx

Return an error if cur_idx is not the start of a field

pub fn num_rows(&self) -> usize

Returns the number of rows

fn serialize(&self, out: &mut String, idx: u32) -> u32

Serialize the tape element at index idx to out returning the next field index

pub fn error(&self, idx: u32, expected: &str) -> ArrowError

Returns an error reading index idx

Trait Implementations

impl<'a> Debug for Tape<'a>

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

Formats the value using the given formatter.