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 TextPadRight;
impl TextPadRight {
pub fn new() -> Self {
Self
}
}
impl ScalarFunction for TextPadRight {
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() != 3 {
return Err(ScalarFunctionError::ArityMismatch {
function: ctx.fragment.clone(),
expected: 3,
actual: columns.len(),
});
}
let str_col = columns.get(0).unwrap();
let len_col = columns.get(1).unwrap();
let pad_col = columns.get(2).unwrap();
let pad_data = match pad_col.data() {
ColumnData::Utf8 {
container,
..
} => container,
other => {
return Err(ScalarFunctionError::InvalidArgumentType {
function: ctx.fragment.clone(),
argument_index: 2,
expected: vec![Type::Utf8],
actual: other.get_type(),
});
}
};
match str_col.data() {
ColumnData::Utf8 {
container: str_container,
..
} => {
let mut result_data = Vec::with_capacity(row_count);
for i in 0..row_count {
if !str_container.is_defined(i) || !pad_data.is_defined(i) {
result_data.push(String::new());
continue;
}
let target_len = match len_col.data() {
ColumnData::Int1(c) => c.get(i).map(|&v| v as i64),
ColumnData::Int2(c) => c.get(i).map(|&v| v as i64),
ColumnData::Int4(c) => c.get(i).map(|&v| v as i64),
ColumnData::Int8(c) => c.get(i).copied(),
ColumnData::Uint1(c) => c.get(i).map(|&v| v as i64),
ColumnData::Uint2(c) => c.get(i).map(|&v| v as i64),
ColumnData::Uint4(c) => c.get(i).map(|&v| v as i64),
_ => {
return Err(ScalarFunctionError::InvalidArgumentType {
function: ctx.fragment.clone(),
argument_index: 1,
expected: vec![
Type::Int1,
Type::Int2,
Type::Int4,
Type::Int8,
],
actual: len_col.data().get_type(),
});
}
};
match target_len {
Some(n) if n >= 0 => {
let s = &str_container[i];
let pad_char = &pad_data[i];
let char_count = s.chars().count();
let target = n as usize;
if char_count >= target {
result_data.push(s.to_string());
} else {
let pad_chars: Vec<char> = pad_char.chars().collect();
if pad_chars.is_empty() {
result_data.push(s.to_string());
} else {
let needed = target - char_count;
let mut padded = String::with_capacity(
s.len() + needed
* pad_chars[0].len_utf8(),
);
padded.push_str(s);
for j in 0..needed {
padded.push(
pad_chars[j % pad_chars.len()]
);
}
result_data.push(padded);
}
}
}
Some(_) => {
result_data.push(String::new());
}
None => {
result_data.push(String::new());
}
}
}
Ok(ColumnData::Utf8 {
container: Utf8Container::new(result_data),
max_bytes: MaxBytes::MAX,
})
}
other => Err(ScalarFunctionError::InvalidArgumentType {
function: ctx.fragment.clone(),
argument_index: 0,
expected: vec![Type::Utf8],
actual: other.get_type(),
}),
}
}
fn return_type(&self, _input_types: &[Type]) -> Type {
Type::Utf8
}
}