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Feat: improve json path selector using less memory #24

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Merged
merged 1 commit into from
Jul 11, 2023
Merged

Feat: improve json path selector using less memory #24

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60 changes: 40 additions & 20 deletions src/functions.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,7 @@ use crate::constants::*;
use crate::error::*;
use crate::jentry::JEntry;
use crate::jsonpath::JsonPath;
use crate::jsonpath::Mode;
use crate::jsonpath::Selector;
use crate::number::Number;
use crate::parser::parse_value;
Expand Down Expand Up @@ -144,40 +145,59 @@ pub fn array_length(value: &[u8]) -> Option<usize> {

/// Get the inner elements of `JSONB` value by JSON path.
/// The return value may contains multiple matching elements.
pub fn get_by_path<'a>(value: &'a [u8], json_path: JsonPath<'a>) -> Vec<Vec<u8>> {
let selector = Selector::new(json_path);
pub fn get_by_path<'a>(
value: &'a [u8],
json_path: JsonPath<'a>,
data: &mut Vec<u8>,
offsets: &mut Vec<u64>,
) {
let selector = Selector::new(json_path, Mode::Mixed);
if !is_jsonb(value) {
match parse_value(value) {
Ok(val) => {
let value = val.to_vec();
selector.select(value.as_slice())
}
Err(_) => vec![],
if let Ok(val) = parse_value(value) {
let value = val.to_vec();
selector.select(value.as_slice(), data, offsets)
}
} else {
selector.select(value)
selector.select(value, data, offsets)
}
}

/// Get the inner element of `JSONB` value by JSON path.
/// If there are multiple matching elements, only the first one is returned
pub fn get_by_path_first<'a>(value: &'a [u8], json_path: JsonPath<'a>) -> Option<Vec<u8>> {
let mut values = get_by_path(value, json_path);
if values.is_empty() {
None
pub fn get_by_path_first<'a>(
value: &'a [u8],
json_path: JsonPath<'a>,
data: &mut Vec<u8>,
offsets: &mut Vec<u64>,
) {
let selector = Selector::new(json_path, Mode::First);
if !is_jsonb(value) {
if let Ok(val) = parse_value(value) {
let value = val.to_vec();
selector.select(value.as_slice(), data, offsets)
}
} else {
Some(values.remove(0))
selector.select(value, data, offsets)
}
}

/// Get the inner elements of `JSONB` value by JSON path.
/// If there are multiple matching elements, return an `JSONB` Array.
pub fn get_by_path_array<'a>(value: &'a [u8], json_path: JsonPath<'a>) -> Option<Vec<u8>> {
let values = get_by_path(value, json_path);
let mut array_value = Vec::new();
let items: Vec<_> = values.iter().map(|v| v.as_slice()).collect();
build_array(items, &mut array_value).unwrap();
Some(array_value)
pub fn get_by_path_array<'a>(
value: &'a [u8],
json_path: JsonPath<'a>,
data: &mut Vec<u8>,
offsets: &mut Vec<u64>,
) {
let selector = Selector::new(json_path, Mode::Array);
if !is_jsonb(value) {
if let Ok(val) = parse_value(value) {
let value = val.to_vec();
selector.select(value.as_slice(), data, offsets)
}
} else {
selector.select(value, data, offsets)
}
}

/// Get the inner element of `JSONB` Array by index.
Expand Down
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