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Preserve false in single-expression queries (#145)

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Note: 1 = 2 is different from 1 == 2
See issue for details

fixes #144

Signed-off-by: Anand Krishnamoorthi <anakrish@microsoft.com>
This commit is contained in:
Anand Krishnamoorthi
2024-02-16 06:11:07 -08:00
committed by GitHub
parent 7d32bd9377
commit 8d282f1ffd
5 changed files with 90 additions and 13 deletions
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src/lib.rs
+39 -3
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@@ -186,17 +186,33 @@ impl Default for QueryResult {
/// ```
/// # use regorus::*;
/// # fn main() -> anyhow::Result<()> {
/// // Create engine and evaluate "true; true; false".
/// // Create engine and evaluate "1 + 1".
/// let results = Engine::new().eval_query("1 + 1".to_string(), false)?;
///
/// assert!(results.result.len() == 1);
/// assert_eq!(results.result.len(), 1);
/// assert_eq!(results.result[0].expressions[0].value, Value::from(2u64));
/// assert_eq!(results.result[0].expressions[0].text.as_ref(), "1 + 1");
/// # Ok(())
/// # }
/// ```
///
/// If any expression evaluates to false, then no results are produced.
/// If a query contains only one expression, and even if the expression evaluates
/// to false, the value will be returned.
/// ```
/// # use regorus::*;
/// # fn main() -> anyhow::Result<()> {
/// // Create engine and evaluate "1 > 2" which is false.
/// let results = Engine::new().eval_query("1 > 2".to_string(), false)?;
///
/// assert_eq!(results.result.len(), 1);
/// assert_eq!(results.result[0].expressions[0].value, Value::from(false));
/// assert_eq!(results.result[0].expressions[0].text.as_ref(), "1 > 2");
/// # Ok(())
/// # }
/// ```
///
/// In a query containing multiple expressions, if any expression evaluates to false,
/// then no results are produced.
/// ```
/// # use regorus::*;
/// # fn main() -> anyhow::Result<()> {
@@ -208,6 +224,26 @@ impl Default for QueryResult {
/// # }
/// ```
///
/// Note that `=` is different from `==`. The former evaluates to undefined if the LHS and RHS
/// are not equal. The latter evaluates to either true or false.
/// ```
/// # use regorus::*;
/// # fn main() -> anyhow::Result<()> {
/// // Create engine and evaluate "1 = 2" which is undefined and produces no resutl.
/// let results = Engine::new().eval_query("1 = 2".to_string(), false)?;
///
/// assert_eq!(results.result.len(), 0);
///
/// // Create engine and evaluate "1 == 2" which evaluates to false.
/// let results = Engine::new().eval_query("1 == 2".to_string(), false)?;
///
/// assert_eq!(results.result.len(), 1);
/// assert_eq!(results.result[0].expressions[0].value, Value::from(false));
/// assert_eq!(results.result[0].expressions[0].text.as_ref(), "1 == 2");
/// # Ok(())
/// # }
/// ```
///
/// Queries containing loops produce multiple results.
/// ```
/// # use regorus::*;