reifydb-routine 0.4.12

Built-in routines (functions and procedures) for ReifyDB
Documentation 
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// SPDX-License-Identifier: Apache-2.0
// Copyright (c) 2025 ReifyDB

use reifydb_core::value::column::{Column, columns::Columns, data::ColumnData};
use reifydb_type::value::{Value, r#type::Type};

use crate::function::{Function, FunctionCapability, FunctionContext, FunctionInfo, error::FunctionError};

fn to_json(value: &Value) -> String {
	match value {
		Value::None {
			..
		} => "null".to_string(),
		Value::Boolean(b) => b.to_string(),
		Value::Float4(f) => f.to_string(),
		Value::Float8(f) => f.to_string(),
		Value::Int1(i) => i.to_string(),
		Value::Int2(i) => i.to_string(),
		Value::Int4(i) => i.to_string(),
		Value::Int8(i) => i.to_string(),
		Value::Int16(i) => i.to_string(),
		Value::Uint1(u) => u.to_string(),
		Value::Uint2(u) => u.to_string(),
		Value::Uint4(u) => u.to_string(),
		Value::Uint8(u) => u.to_string(),
		Value::Uint16(u) => u.to_string(),
		Value::Int(i) => i.to_string(),
		Value::Uint(u) => u.to_string(),
		Value::Decimal(d) => d.to_string(),
		Value::Utf8(s) => format!("\"{}\"", s.replace('\\', "\\\\").replace('"', "\\\"")),
		Value::Uuid4(u) => format!("\"{}\"", u),
		Value::Uuid7(u) => format!("\"{}\"", u),
		Value::IdentityId(id) => format!("\"{}\"", id),
		Value::Date(d) => format!("\"{}\"", d),
		Value::DateTime(dt) => format!("\"{}\"", dt),
		Value::Time(t) => format!("\"{}\"", t),
		Value::Duration(d) => format!("\"{}\"", d.to_iso_string()),
		Value::Blob(b) => format!("\"{}\"", b),
		Value::DictionaryId(id) => format!("\"{}\"", id),
		Value::Type(t) => format!("\"{}\"", t),
		Value::Any(v) => to_json(v),
		Value::List(items) => {
			let inner: Vec<String> = items.iter().map(to_json).collect();
			format!("[{}]", inner.join(", "))
		}
		Value::Tuple(items) => {
			let inner: Vec<String> = items.iter().map(to_json).collect();
			format!("[{}]", inner.join(", "))
		}
		Value::Record(fields) => {
			let inner: Vec<String> = fields
				.iter()
				.map(|(k, v)| {
					format!("\"{}\": {}", k.replace('\\', "\\\\").replace('"', "\\\""), to_json(v))
				})
				.collect();
			format!("{{{}}}", inner.join(", "))
		}
	}
}

pub struct JsonSerialize {
	info: FunctionInfo,
}

impl Default for JsonSerialize {
	fn default() -> Self {
		Self::new()
	}
}

impl JsonSerialize {
	pub fn new() -> Self {
		Self {
			info: FunctionInfo::new("json::serialize"),
		}
	}
}

impl Function for JsonSerialize {
	fn info(&self) -> &FunctionInfo {
		&self.info
	}

	fn capabilities(&self) -> &[FunctionCapability] {
		&[FunctionCapability::Scalar]
	}

	fn return_type(&self, _input_types: &[Type]) -> Type {
		Type::Utf8
	}

	fn execute(&self, ctx: &FunctionContext, args: &Columns) -> Result<Columns, FunctionError> {
		if args.len() != 1 {
			return Err(FunctionError::ArityMismatch {
				function: ctx.fragment.clone(),
				expected: 1,
				actual: args.len(),
			});
		}

		let column = &args[0];
		let (data, bitvec) = column.data().unwrap_option();
		let row_count = data.len();

		let results: Vec<String> = (0..row_count).map(|row| to_json(&data.get_value(row))).collect();

		let result_data = ColumnData::utf8(results);
		let final_data = match bitvec {
			Some(bv) => ColumnData::Option {
				inner: Box::new(result_data),
				bitvec: bv.clone(),
			},
			None => result_data,
		};

		Ok(Columns::new(vec![Column::new(ctx.fragment.clone(), final_data)]))
	}
}