use reifydb_core::value::column::data::ColumnData;
use reifydb_type::value::{constraint::bytes::MaxBytes, container::utf8::Utf8Container, r#type::Type};
use crate::function::{
ScalarFunction, ScalarFunctionContext,
error::{ScalarFunctionError, ScalarFunctionResult},
propagate_options,
};
pub struct TimeFormat;
impl TimeFormat {
pub fn new() -> Self {
Self
}
}
fn format_time(hour: u32, minute: u32, second: u32, nanosecond: u32, fmt: &str) -> Result<String, String> {
let mut result = String::new();
let mut chars = fmt.chars().peekable();
while let Some(ch) = chars.next() {
if ch == '%' {
match chars.peek() {
Some('H') => {
chars.next();
result.push_str(&format!("{:02}", hour));
}
Some('M') => {
chars.next();
result.push_str(&format!("{:02}", minute));
}
Some('S') => {
chars.next();
result.push_str(&format!("{:02}", second));
}
Some('f') => {
chars.next();
result.push_str(&format!("{:09}", nanosecond));
}
Some('3') => {
chars.next();
if chars.peek() == Some(&'f') {
chars.next();
result.push_str(&format!("{:03}", nanosecond / 1_000_000));
} else {
return Err(
"invalid format specifier: '%3' (expected '%3f')".to_string()
);
}
}
Some('6') => {
chars.next();
if chars.peek() == Some(&'f') {
chars.next();
result.push_str(&format!("{:06}", nanosecond / 1_000));
} else {
return Err(
"invalid format specifier: '%6' (expected '%6f')".to_string()
);
}
}
Some('%') => {
chars.next();
result.push('%');
}
Some(c) => {
let c = *c;
return Err(format!("invalid format specifier: '%{}'", c));
}
None => return Err("unexpected end of format string after '%'".to_string()),
}
} else {
result.push(ch);
}
}
Ok(result)
}
impl ScalarFunction for TimeFormat {
fn scalar(&self, ctx: ScalarFunctionContext) -> ScalarFunctionResult<ColumnData> {
if let Some(result) = propagate_options(self, &ctx) {
return result;
}
let columns = ctx.columns;
let row_count = ctx.row_count;
if columns.len() != 2 {
return Err(ScalarFunctionError::ArityMismatch {
function: ctx.fragment.clone(),
expected: 2,
actual: columns.len(),
});
}
let time_col = columns.get(0).unwrap();
let fmt_col = columns.get(1).unwrap();
match (time_col.data(), fmt_col.data()) {
(
ColumnData::Time(time_container),
ColumnData::Utf8 {
container: fmt_container,
..
},
) => {
let mut result_data = Vec::with_capacity(row_count);
for i in 0..row_count {
match (time_container.get(i), fmt_container.is_defined(i)) {
(Some(t), true) => {
let fmt_str = &fmt_container[i];
match format_time(
t.hour(),
t.minute(),
t.second(),
t.nanosecond(),
fmt_str,
) {
Ok(formatted) => {
result_data.push(formatted);
}
Err(reason) => {
return Err(
ScalarFunctionError::ExecutionFailed {
function: ctx.fragment.clone(),
reason,
},
);
}
}
}
_ => {
result_data.push(String::new());
}
}
}
Ok(ColumnData::Utf8 {
container: Utf8Container::new(result_data),
max_bytes: MaxBytes::MAX,
})
}
(ColumnData::Time(_), other) => Err(ScalarFunctionError::InvalidArgumentType {
function: ctx.fragment.clone(),
argument_index: 1,
expected: vec![Type::Utf8],
actual: other.get_type(),
}),
(other, _) => Err(ScalarFunctionError::InvalidArgumentType {
function: ctx.fragment.clone(),
argument_index: 0,
expected: vec![Type::Time],
actual: other.get_type(),
}),
}
}
fn return_type(&self, _input_types: &[Type]) -> Type {
Type::Utf8
}
}