Trait Host

Source

pub trait Host {
Show 38 methods    // Required methods
    fn scan_start(&mut self, rel_id: i32) -> i32;
    fn scan_delta_start(&mut self, rel_id: i32) -> i32;
    fn scan_next(&mut self, iter_id: i32) -> i32;
    fn merge_deltas(&mut self) -> i32;
    fn scan_aggregate_start(
        &mut self,
        rel_id: i32,
        description: Vec<i32>,
    ) -> i32;
    fn scan_index_start(
        &mut self,
        rel_id: i32,
        col_idx: i32,
        val: HostVal,
    ) -> i32;
    fn get_col(&mut self, tuple_ptr: i32, col_idx: i32) -> HostVal;
    fn insert_begin(&mut self, rel_id: i32);
    fn insert_push(&mut self, val: HostVal);
    fn insert_end(&mut self);
    fn const_number(&mut self, n: i64) -> HostVal;
    fn const_float(&mut self, bits: i64) -> HostVal;
    fn const_string(&mut self, id: i32) -> HostVal;
    fn const_name(&mut self, id: i32) -> HostVal;
    fn const_time(&mut self, nanos: i64) -> HostVal;
    fn const_duration(&mut self, nanos: i64) -> HostVal;
    fn val_add(&mut self, a: HostVal, b: HostVal) -> HostVal;
    fn val_sub(&mut self, a: HostVal, b: HostVal) -> HostVal;
    fn val_mul(&mut self, a: HostVal, b: HostVal) -> HostVal;
    fn val_div(&mut self, a: HostVal, b: HostVal) -> HostVal;
    fn val_sqrt(&mut self, a: HostVal) -> HostVal;
    fn val_eq(&mut self, a: HostVal, b: HostVal) -> i32;
    fn val_neq(&mut self, a: HostVal, b: HostVal) -> i32;
    fn val_lt(&mut self, a: HostVal, b: HostVal) -> i32;
    fn val_le(&mut self, a: HostVal, b: HostVal) -> i32;
    fn val_gt(&mut self, a: HostVal, b: HostVal) -> i32;
    fn val_ge(&mut self, a: HostVal, b: HostVal) -> i32;
    fn str_concat(&mut self, a: HostVal, b: HostVal) -> HostVal;
    fn str_replace(
        &mut self,
        s: HostVal,
        old: HostVal,
        new: HostVal,
        count: HostVal,
    ) -> HostVal;
    fn val_to_string(&mut self, val: HostVal) -> HostVal;
    fn compound_begin(&mut self, kind: i32);
    fn compound_push(&mut self, val: HostVal);
    fn compound_end(&mut self) -> HostVal;
    fn compound_get(&mut self, compound: HostVal, key: HostVal) -> HostVal;
    fn compound_len(&mut self, compound: HostVal) -> HostVal;
    fn pair_first(&mut self, compound: HostVal) -> HostVal;
    fn pair_second(&mut self, compound: HostVal) -> HostVal;
    fn debuglog(&mut self, val: HostVal);
}

Expand description

Trait for the host environment that provides storage and data access (Server Mode).

All Mangle values (numbers, floats, strings, compounds) are represented as opaque HostVal handles. In WASM, these map to externref — the WASM module never inspects values directly; all operations go through host calls.