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feat: integer conversion functions for Value #328

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merged 1 commit into from
Oct 9, 2024
Merged

feat: integer conversion functions for Value #328

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174 changes: 174 additions & 0 deletions src/value.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -904,6 +904,180 @@ impl Value {
}
}

/// Cast value to [`& u32`] if [`Value::Number`].
///
/// Error is raised if the value is not a number or if the numeric value
/// does not fit in a u32.
///
/// ```
/// # use regorus::*;
/// # fn main() -> anyhow::Result<()> {
/// let v = Value::from(10);
/// assert_eq!(v.as_u32()?, 10u32);
///
/// let v = Value::from(-10);
/// assert!(v.as_u32().is_err());
/// # Ok(())
/// # }
pub fn as_u32(&self) -> Result<u32> {
match self {
Value::Number(b) => {
if let Some(n) = b.as_u64() {
if let Ok(v) = u32::try_from(n) {
return Ok(v);
}
}
bail!("not a u32");
}
_ => Err(anyhow!("not a u32")),
}
}

/// Cast value to [`& i32`] if [`Value::Number`].
///
/// Error is raised if the value is not a number or if the numeric value
/// does not fit in a i32.
///
/// ```
/// # use regorus::*;
/// # fn main() -> anyhow::Result<()> {
/// let v = Value::from(-10);
/// assert_eq!(v.as_i32()?, -10i32);
///
/// let v = Value::from(2_147_483_648i64);
/// assert!(v.as_i32().is_err());
/// # Ok(())
/// # }
pub fn as_i32(&self) -> Result<i32> {
match self {
Value::Number(b) => {
if let Some(n) = b.as_i64() {
if let Ok(v) = i32::try_from(n) {
return Ok(v);
}
}
bail!("not an i32");
}
_ => Err(anyhow!("not an i32")),
}
}

/// Cast value to [`& u16`] if [`Value::Number`].
///
/// Error is raised if the value is not a number or if the numeric value
/// does not fit in a u16.
///
/// ```
/// # use regorus::*;
/// # fn main() -> anyhow::Result<()> {
/// let v = Value::from(10);
/// assert_eq!(v.as_u16()?, 10u16);
///
/// let v = Value::from(-10);
/// assert!(v.as_u16().is_err());
/// # Ok(())
/// # }
pub fn as_u16(&self) -> Result<u16> {
match self {
Value::Number(b) => {
if let Some(n) = b.as_u64() {
if let Ok(v) = u16::try_from(n) {
return Ok(v);
}
}
bail!("not a u16");
}
_ => Err(anyhow!("not a u16")),
}
}

/// Cast value to [`& i16`] if [`Value::Number`].
///
/// Error is raised if the value is not a number or if the numeric value
/// does not fit in a i16.
///
/// ```
/// # use regorus::*;
/// # fn main() -> anyhow::Result<()> {
/// let v = Value::from(-10);
/// assert_eq!(v.as_i16()?, -10i16);
///
/// let v = Value::from(32768i64);
/// assert!(v.as_i16().is_err());
/// # Ok(())
/// # }
pub fn as_i16(&self) -> Result<i16> {
match self {
Value::Number(b) => {
if let Some(n) = b.as_i64() {
if let Ok(v) = i16::try_from(n) {
return Ok(v);
}
}
bail!("not an i16");
}
_ => Err(anyhow!("not an i16")),
}
}

/// Cast value to [`& u8`] if [`Value::Number`].
///
/// Error is raised if the value is not a number or if the numeric value
/// does not fit in a u8.
///
/// ```
/// # use regorus::*;
/// # fn main() -> anyhow::Result<()> {
/// let v = Value::from(10);
/// assert_eq!(v.as_u8()?, 10u8);
///
/// let v = Value::from(-10);
/// assert!(v.as_u8().is_err());
/// # Ok(())
/// # }
pub fn as_u8(&self) -> Result<u8> {
match self {
Value::Number(b) => {
if let Some(n) = b.as_u64() {
if let Ok(v) = u8::try_from(n) {
return Ok(v);
}
}
bail!("not a u8");
}
_ => Err(anyhow!("not a u8")),
}
}

/// Cast value to [`& i8`] if [`Value::Number`].
///
/// Error is raised if the value is not a number or if the numeric value
/// does not fit in a i8.
///
/// ```
/// # use regorus::*;
/// # fn main() -> anyhow::Result<()> {
/// let v = Value::from(-10);
/// assert_eq!(v.as_i8()?, -10i8);
///
/// let v = Value::from(128);
/// assert!(v.as_i8().is_err());
/// # Ok(())
/// # }
pub fn as_i8(&self) -> Result<i8> {
match self {
Value::Number(b) => {
if let Some(n) = b.as_i64() {
if let Ok(v) = i8::try_from(n) {
return Ok(v);
}
}
bail!("not an i8");
}
_ => Err(anyhow!("not an i8")),
}
}

/// Cast value to [`& f64`] if [`Value::Number`].
/// Error is raised if the value is not a number or if the numeric value
/// does not fit in a i64.
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