icydb-core 0.94.0

IcyDB — A schema-first typed query engine and persistence runtime for Internet Computer canisters
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134

use crate::{
    db::predicate::{CoercionId, CoercionSpec, CompareOp},
    value::{TextMode, Value},
};
use std::cmp::Ordering;

use crate::db::predicate::runtime::compare::scalar::direct::compare::eval_ordered_compare_result;

// Evaluate one scalar text compare without allocating an owned `Value::Text`.
pub(super) fn eval_text_scalar_compare(
    actual: &str,
    op: CompareOp,
    value: &Value,
    coercion: &CoercionSpec,
) -> Option<bool> {
    let mode = match coercion.id {
        CoercionId::Strict | CoercionId::CollectionElement => TextMode::Cs,
        CoercionId::TextCasefold => TextMode::Ci,
        CoercionId::NumericWiden => return None,
    };

    match op {
        CompareOp::Eq
        | CompareOp::Ne
        | CompareOp::Lt
        | CompareOp::Lte
        | CompareOp::Gt
        | CompareOp::Gte => Some(eval_text_scalar_order_compare(actual, op, value, mode)),
        CompareOp::StartsWith => Some(
            matches!(value, Value::Text(expected) if text_starts_with_scalar(actual, expected, mode)),
        ),
        CompareOp::EndsWith => Some(
            matches!(value, Value::Text(expected) if text_ends_with_scalar(actual, expected, mode)),
        ),
        CompareOp::In | CompareOp::NotIn => {
            Some(eval_text_list_membership_compare(op, actual, value, mode))
        }
        CompareOp::Contains => Some(false),
    }
}

// Evaluate one ordered text compare against one scalar text value without
// repeating the literal-match and canonical text compare path for each op.
fn eval_text_scalar_order_compare(
    actual: &str,
    op: CompareOp,
    value: &Value,
    mode: TextMode,
) -> bool {
    let Value::Text(expected) = value else {
        return false;
    };

    eval_ordered_compare_result(op, compare_scalar_text(actual, expected, mode))
}

fn eval_text_list_membership_compare(
    op: CompareOp,
    actual: &str,
    value: &Value,
    mode: TextMode,
) -> bool {
    match op {
        CompareOp::In => text_in_list(actual, value, mode).unwrap_or(false),
        CompareOp::NotIn => text_in_list(actual, value, mode).is_some_and(|did_match| !did_match),
        CompareOp::Eq
        | CompareOp::Ne
        | CompareOp::Lt
        | CompareOp::Lte
        | CompareOp::Gt
        | CompareOp::Gte
        | CompareOp::Contains
        | CompareOp::StartsWith
        | CompareOp::EndsWith => false,
    }
}

fn text_in_list(actual: &str, list: &Value, mode: TextMode) -> Option<bool> {
    let Value::List(items) = list else {
        return None;
    };

    let mut saw_valid = false;
    for item in items {
        if let Value::Text(expected) = item {
            if compare_scalar_text(actual, expected, mode) == Ordering::Equal {
                return Some(true);
            }
            saw_valid = true;
        }
    }

    saw_valid.then_some(false)
}

fn compare_scalar_text(actual: &str, expected: &str, mode: TextMode) -> Ordering {
    match mode {
        TextMode::Cs => actual.cmp(expected),
        TextMode::Ci => casefold_scalar_text(actual).cmp(&casefold_scalar_text(expected)),
    }
}

pub(in crate::db::predicate::runtime) fn text_contains_scalar(
    actual: &str,
    needle: &str,
    mode: TextMode,
) -> bool {
    match mode {
        TextMode::Cs => actual.contains(needle),
        TextMode::Ci => casefold_scalar_text(actual).contains(&casefold_scalar_text(needle)),
    }
}

fn text_starts_with_scalar(actual: &str, prefix: &str, mode: TextMode) -> bool {
    match mode {
        TextMode::Cs => actual.starts_with(prefix),
        TextMode::Ci => casefold_scalar_text(actual).starts_with(&casefold_scalar_text(prefix)),
    }
}

fn text_ends_with_scalar(actual: &str, suffix: &str, mode: TextMode) -> bool {
    match mode {
        TextMode::Cs => actual.ends_with(suffix),
        TextMode::Ci => casefold_scalar_text(actual).ends_with(&casefold_scalar_text(suffix)),
    }
}

fn casefold_scalar_text(input: &str) -> String {
    if input.is_ascii() {
        return input.to_ascii_lowercase();
    }

    input.to_lowercase()
}