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//! # FHIRPath Date and Time Operations
//!
//! Implements date and time arithmetic operations for FHIRPath temporal calculations.
use crate::datetime_impl;
use helios_fhirpath_support::{EvaluationError, EvaluationResult};
/// Check if a value is of a particular date/time type
/// Handles both 'is' and 'as' operations
pub fn apply_date_type_operation(
value: &EvaluationResult,
op: &str,
type_name: &str,
_namespace: Option<&str>,
) -> Result<EvaluationResult, EvaluationError> {
match op {
"is" => {
// Handle date literal checks (e.g., @2015.is(Date))
match value {
// Check Date, DateTime, Time types first
EvaluationResult::Date(_, _, _) => Ok(EvaluationResult::boolean(
type_name == "Date" || type_name == "date",
)),
EvaluationResult::DateTime(_, _, _) => Ok(EvaluationResult::boolean(
type_name == "DateTime" || type_name == "dateTime",
)),
EvaluationResult::Time(_, _, _) => Ok(EvaluationResult::boolean(
type_name == "Time" || type_name == "time",
)),
// Various date literals in string form
EvaluationResult::String(s, _, _) if s.starts_with('@') => {
// Extract the actual date/time string by removing the leading @
let date_value = s.trim_start_matches('@');
// Check format and match against requested type
match type_name {
"Date" | "date" => {
// Valid date formats: YYYY, YYYY-MM, YYYY-MM-DD
let is_date = date_value.len() == 4 || // YYYY
date_value.len() == 7 || // YYYY-MM
date_value.len() == 10; // YYYY-MM-DD
// Also check that it doesn't contain a T (which would make it a datetime)
let is_date = is_date && !date_value.contains('T');
Ok(EvaluationResult::boolean(is_date))
}
"DateTime" | "dateTime" => {
// Valid datetime format: contains a T
let is_datetime = date_value.contains('T');
Ok(EvaluationResult::boolean(is_datetime))
}
"Time" | "time" => {
// Valid time format: starts with T
let is_time = date_value.starts_with('T');
Ok(EvaluationResult::boolean(is_time))
}
_ => Ok(EvaluationResult::boolean(false)),
}
}
// Not a date/time value
_ => Ok(EvaluationResult::boolean(false)),
}
}
"as" => {
// Check if the value is of the target type
let is_result = apply_date_type_operation(value, "is", type_name, _namespace)?;
match is_result {
EvaluationResult::Boolean(true, _, _) => {
// Value is already of the target type, return as is
Ok(value.clone())
}
_ => {
// Value is not of the target type, try to convert it
match (type_name, value) {
// Try to convert to date
("Date" | "date", EvaluationResult::String(s, _, _)) => {
if let Some(date) = datetime_impl::parse_date(s) {
Ok(EvaluationResult::date(date.format("%Y-%m-%d").to_string()))
} else {
Ok(EvaluationResult::Empty)
}
}
("Date" | "date", EvaluationResult::DateTime(dt, None, None)) => {
// Extract date part from datetime
if let Some(date) =
datetime_impl::to_date(&EvaluationResult::datetime(dt.clone()))
{
Ok(EvaluationResult::date(date))
} else {
Ok(EvaluationResult::Empty)
}
}
// Try to convert to datetime
("DateTime" | "dateTime", EvaluationResult::String(s, _, _)) => {
if let Some(dt) = datetime_impl::parse_datetime(s) {
Ok(EvaluationResult::datetime(
dt.format("%Y-%m-%dT%H:%M:%S").to_string(),
))
} else {
Ok(EvaluationResult::Empty)
}
}
("DateTime" | "dateTime", EvaluationResult::Date(d, _, _)) => {
// Convert date to datetime by adding T00:00:00
if let Some(dt) =
datetime_impl::to_datetime(&EvaluationResult::date(d.clone()))
{
Ok(EvaluationResult::datetime(dt))
} else {
Ok(EvaluationResult::Empty)
}
}
// Try to convert to time
("Time" | "time", EvaluationResult::String(s, _, _)) => {
if let Some(time) = datetime_impl::parse_time(s) {
Ok(EvaluationResult::time(time.format("%H:%M:%S").to_string()))
} else {
Ok(EvaluationResult::Empty)
}
}
// Cannot convert to the target type
_ => Ok(EvaluationResult::Empty),
}
}
}
}
_ => Err(EvaluationError::TypeError(format!(
"Unsupported date type operation: {}",
op
))),
}
}
/// Parse date literals from @ notation
/// For example, @2015, @2015-02, @2015-02-04, @2015-02-04T14:30, @T14:30
pub fn parse_date_literal(literal: &str) -> Result<EvaluationResult, EvaluationError> {
if !literal.starts_with('@') {
return Err(EvaluationError::TypeError(format!(
"Not a date/time literal: {}",
literal
)));
}
let value = literal.trim_start_matches('@');
// Check if it's a date, datetime, or time
if value.starts_with('T') {
// Time literal: @T14:30
if let Some(time) = datetime_impl::parse_time(value.trim_start_matches('T')) {
Ok(EvaluationResult::time(time.format("%H:%M:%S").to_string()))
} else {
Err(EvaluationError::TypeError(format!(
"Invalid time literal: {}",
literal
)))
}
} else if value.contains('T') {
// DateTime literal: @2015-02-04T14:30
if let Some(dt) = datetime_impl::parse_datetime(value) {
Ok(EvaluationResult::datetime(
dt.format("%Y-%m-%dT%H:%M:%S").to_string(),
))
} else {
Err(EvaluationError::TypeError(format!(
"Invalid datetime literal: {}",
literal
)))
}
} else {
// Date literal: @2015, @2015-02, @2015-02-04
if let Some(date) = datetime_impl::parse_date(value) {
Ok(EvaluationResult::date(date.format("%Y-%m-%d").to_string()))
} else {
Err(EvaluationError::TypeError(format!(
"Invalid date literal: {}",
literal
)))
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_date_is_operation() {
// Test @2015.is(Date)
let year_literal = EvaluationResult::string("@2015".to_string());
let result = apply_date_type_operation(&year_literal, "is", "Date", None).unwrap();
assert_eq!(result, EvaluationResult::boolean(true));
// Test @2015-02.is(Date)
let month_literal = EvaluationResult::string("@2015-02".to_string());
let result = apply_date_type_operation(&month_literal, "is", "Date", None).unwrap();
assert_eq!(result, EvaluationResult::boolean(true));
// Test @2015-02-04.is(Date)
let day_literal = EvaluationResult::string("@2015-02-04".to_string());
let result = apply_date_type_operation(&day_literal, "is", "Date", None).unwrap();
assert_eq!(result, EvaluationResult::boolean(true));
// Test @2015T.is(DateTime)
let year_dt_literal = EvaluationResult::string("@2015T".to_string());
let result = apply_date_type_operation(&year_dt_literal, "is", "DateTime", None).unwrap();
assert_eq!(result, EvaluationResult::boolean(true));
// Test @T14:30.is(Time)
let time_literal = EvaluationResult::string("@T14:30".to_string());
let result = apply_date_type_operation(&time_literal, "is", "Time", None).unwrap();
assert_eq!(result, EvaluationResult::boolean(true));
}
#[test]
fn test_parse_date_literal() {
// Test @2015
let result = parse_date_literal("@2015").unwrap();
assert_eq!(result, EvaluationResult::date("2015-01-01".to_string()));
// Test @2015-02
let result = parse_date_literal("@2015-02").unwrap();
assert_eq!(result, EvaluationResult::date("2015-02-01".to_string()));
// Test @2015-02-04
let result = parse_date_literal("@2015-02-04").unwrap();
assert_eq!(result, EvaluationResult::date("2015-02-04".to_string()));
// Test @2015-02-04T14:30
let result = parse_date_literal("@2015-02-04T14:30").unwrap();
assert_eq!(
result,
EvaluationResult::datetime("2015-02-04T14:30:00".to_string())
);
// Test @T14:30
let result = parse_date_literal("@T14:30").unwrap();
assert_eq!(result, EvaluationResult::time("14:30:00".to_string()));
}
}