use runmat_builtins::Value;
use runmat_macros::runtime_builtin;
use crate::builtins::common::broadcast::{broadcast_index, broadcast_shapes, compute_strides};
use crate::builtins::common::map_control_flow_with_builtin;
use crate::builtins::common::spec::{
BroadcastSemantics, BuiltinFusionSpec, BuiltinGpuSpec, ConstantStrategy, GpuOpKind,
ReductionNaN, ResidencyPolicy, ShapeRequirements,
};
use crate::builtins::common::tensor;
use crate::builtins::strings::search::text_utils::{logical_result, TextCollection, TextElement};
use crate::builtins::strings::type_resolvers::logical_text_match_type;
use crate::{build_runtime_error, gather_if_needed_async, BuiltinResult, RuntimeError};
#[runmat_macros::register_gpu_spec(builtin_path = "crate::builtins::strings::core::strcmp")]
pub const GPU_SPEC: BuiltinGpuSpec = BuiltinGpuSpec {
name: "strcmp",
op_kind: GpuOpKind::Custom("string-compare"),
supported_precisions: &[],
broadcast: BroadcastSemantics::Matlab,
provider_hooks: &[],
constant_strategy: ConstantStrategy::InlineLiteral,
residency: ResidencyPolicy::GatherImmediately,
nan_mode: ReductionNaN::Include,
two_pass_threshold: None,
workgroup_size: None,
accepts_nan_mode: false,
notes: "Performs host-side text comparisons; GPU operands are gathered automatically before evaluation.",
};
#[runmat_macros::register_fusion_spec(builtin_path = "crate::builtins::strings::core::strcmp")]
pub const FUSION_SPEC: BuiltinFusionSpec = BuiltinFusionSpec {
name: "strcmp",
shape: ShapeRequirements::Any,
constant_strategy: ConstantStrategy::InlineLiteral,
elementwise: None,
reduction: None,
emits_nan: false,
notes: "Produces logical results on the host; not eligible for GPU fusion.",
};
#[allow(dead_code)]
fn strcmp_flow(message: impl Into<String>) -> RuntimeError {
build_runtime_error(message).with_builtin("strcmp").build()
}
fn remap_strcmp_flow(err: RuntimeError) -> RuntimeError {
map_control_flow_with_builtin(err, "strcmp")
}
#[runtime_builtin(
name = "strcmp",
category = "strings/core",
summary = "Compare text inputs for exact matches (case-sensitive).",
keywords = "strcmp,string compare,text equality",
accel = "sink",
type_resolver(logical_text_match_type),
builtin_path = "crate::builtins::strings::core::strcmp"
)]
async fn strcmp_builtin(a: Value, b: Value) -> crate::BuiltinResult<Value> {
let a = gather_if_needed_async(&a)
.await
.map_err(remap_strcmp_flow)?;
let b = gather_if_needed_async(&b)
.await
.map_err(remap_strcmp_flow)?;
let left = TextCollection::from_argument("strcmp", a, "first argument")?;
let right = TextCollection::from_argument("strcmp", b, "second argument")?;
evaluate_strcmp(&left, &right)
}
fn evaluate_strcmp(left: &TextCollection, right: &TextCollection) -> BuiltinResult<Value> {
let shape = broadcast_shapes("strcmp", &left.shape, &right.shape)?;
let total = tensor::element_count(&shape);
if total == 0 {
return logical_result("strcmp", Vec::new(), shape);
}
let left_strides = compute_strides(&left.shape);
let right_strides = compute_strides(&right.shape);
let mut data = Vec::with_capacity(total);
for linear in 0..total {
let li = broadcast_index(linear, &shape, &left.shape, &left_strides);
let ri = broadcast_index(linear, &shape, &right.shape, &right_strides);
let equal = match (&left.elements[li], &right.elements[ri]) {
(TextElement::Missing, _) => false,
(_, TextElement::Missing) => false,
(TextElement::Text(lhs), TextElement::Text(rhs)) => lhs == rhs,
};
data.push(if equal { 1 } else { 0 });
}
logical_result("strcmp", data, shape)
}
#[cfg(test)]
pub(crate) mod tests {
use super::*;
use crate::RuntimeError;
use runmat_builtins::{CellArray, CharArray, LogicalArray, ResolveContext, StringArray, Type};
fn strcmp_builtin(a: Value, b: Value) -> BuiltinResult<Value> {
futures::executor::block_on(super::strcmp_builtin(a, b))
}
fn error_message(err: RuntimeError) -> String {
err.message().to_string()
}
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
#[test]
fn strcmp_string_scalar_true() {
let result = strcmp_builtin(
Value::String("RunMat".into()),
Value::String("RunMat".into()),
)
.expect("strcmp");
assert_eq!(result, Value::Bool(true));
}
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
#[test]
fn strcmp_string_scalar_false() {
let result = strcmp_builtin(
Value::String("RunMat".into()),
Value::String("runmat".into()),
)
.expect("strcmp");
assert_eq!(result, Value::Bool(false));
}
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
#[test]
fn strcmp_string_array_broadcast_scalar() {
let array = StringArray::new(
vec!["red".into(), "green".into(), "blue".into()],
vec![1, 3],
)
.unwrap();
let result =
strcmp_builtin(Value::StringArray(array), Value::String("green".into())).expect("cmp");
let expected = LogicalArray::new(vec![0, 1, 0], vec![1, 3]).unwrap();
assert_eq!(result, Value::LogicalArray(expected));
}
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
#[test]
fn strcmp_char_array_row_compare() {
let chars = CharArray::new(vec!['c', 'a', 't', 'd', 'o', 'g'], 2, 3).unwrap();
let result =
strcmp_builtin(Value::CharArray(chars), Value::String("cat".into())).expect("cmp");
let expected = LogicalArray::new(vec![1, 0], vec![2, 1]).unwrap();
assert_eq!(result, Value::LogicalArray(expected));
}
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
#[test]
fn strcmp_char_array_to_char_array() {
let left = CharArray::new(vec!['a', 'b', 'c', 'd'], 2, 2).unwrap();
let right = CharArray::new(vec!['a', 'b', 'x', 'y'], 2, 2).unwrap();
let result =
strcmp_builtin(Value::CharArray(left), Value::CharArray(right)).expect("strcmp");
let expected = LogicalArray::new(vec![1, 0], vec![2, 1]).unwrap();
assert_eq!(result, Value::LogicalArray(expected));
}
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
#[test]
fn strcmp_cell_array_scalar() {
let cell = CellArray::new(
vec![
Value::from("apple"),
Value::from("pear"),
Value::from("grape"),
],
1,
3,
)
.unwrap();
let result =
strcmp_builtin(Value::Cell(cell), Value::String("grape".into())).expect("strcmp");
let expected = LogicalArray::new(vec![0, 0, 1], vec![1, 3]).unwrap();
assert_eq!(result, Value::LogicalArray(expected));
}
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
#[test]
fn strcmp_cell_array_to_cell_array_broadcasts() {
let left = CellArray::new(vec![Value::from("red"), Value::from("blue")], 2, 1).unwrap();
let right = CellArray::new(vec![Value::from("red")], 1, 1).unwrap();
let result = strcmp_builtin(Value::Cell(left), Value::Cell(right)).expect("strcmp");
let expected = LogicalArray::new(vec![1, 0], vec![2, 1]).unwrap();
assert_eq!(result, Value::LogicalArray(expected));
}
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
#[test]
fn strcmp_string_array_multi_dimensional_broadcast() {
let left = StringArray::new(vec!["north".into(), "south".into()], vec![2, 1]).unwrap();
let right = StringArray::new(
vec!["north".into(), "east".into(), "south".into()],
vec![1, 3],
)
.unwrap();
let result =
strcmp_builtin(Value::StringArray(left), Value::StringArray(right)).expect("strcmp");
let expected = LogicalArray::new(vec![1, 0, 0, 0, 0, 1], vec![2, 3]).unwrap();
assert_eq!(result, Value::LogicalArray(expected));
}
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
#[test]
fn strcmp_char_array_trailing_space_is_not_equal() {
let chars = CharArray::new(vec!['c', 'a', 't', ' '], 1, 4).unwrap();
let result =
strcmp_builtin(Value::CharArray(chars), Value::String("cat".into())).expect("strcmp");
assert_eq!(result, Value::Bool(false));
}
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
#[test]
fn strcmp_char_array_empty_rows_returns_empty() {
let chars = CharArray::new(Vec::new(), 0, 0).unwrap();
let result = strcmp_builtin(Value::CharArray(chars), Value::String("anything".into()))
.expect("strcmp");
match result {
Value::LogicalArray(array) => {
assert_eq!(array.shape, vec![0, 1]);
assert!(array.data.is_empty());
}
other => panic!("expected empty logical array, got {other:?}"),
}
}
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
#[test]
fn strcmp_missing_strings_compare_false() {
let strings = StringArray::new(vec!["<missing>".into()], vec![1, 1]).unwrap();
let result = strcmp_builtin(
Value::StringArray(strings.clone()),
Value::StringArray(strings),
)
.expect("strcmp");
assert_eq!(result, Value::Bool(false));
}
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
#[test]
fn strcmp_missing_string_false() {
let array = StringArray::new(vec!["alpha".into(), "<missing>".into()], vec![1, 2]).unwrap();
let result =
strcmp_builtin(Value::StringArray(array), Value::String("alpha".into())).expect("cmp");
let expected = LogicalArray::new(vec![1, 0], vec![1, 2]).unwrap();
assert_eq!(result, Value::LogicalArray(expected));
}
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
#[test]
fn strcmp_size_mismatch_error() {
let left = StringArray::new(vec!["a".into(), "b".into()], vec![2, 1]).unwrap();
let right = StringArray::new(vec!["a".into(), "b".into(), "c".into()], vec![3, 1]).unwrap();
let err = error_message(
strcmp_builtin(Value::StringArray(left), Value::StringArray(right))
.expect_err("size mismatch"),
);
assert!(err.contains("size mismatch"));
}
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
#[test]
fn strcmp_invalid_argument_type() {
let err = error_message(
strcmp_builtin(Value::Num(1.0), Value::String("a".into())).expect_err("invalid type"),
);
assert!(err.contains("first argument must be text"));
}
#[test]
fn strcmp_type_is_logical_match() {
assert_eq!(
logical_text_match_type(
&[Type::String, Type::String],
&ResolveContext::new(Vec::new()),
),
Type::Bool
);
}
}