xan 0.57.1

The CSV magician
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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169

use crate::collections::HashMap;

use crate::moonblade::error::EvaluationError;
use crate::moonblade::types::{BoundArguments, DynamicValue};

use super::FunctionResult;

fn get_subroutine<'a>(
    target: &'a DynamicValue,
    key: &'a DynamicValue,
) -> Result<Option<DynamicValue>, EvaluationError> {
    Ok(match target {
        DynamicValue::String(value) => {
            let mut index = key.try_as_i64()?;

            if index < 0 {
                index += value.len() as i64;
            }

            if index < 0 {
                None
            } else {
                value.chars().nth(index as usize).map(DynamicValue::from)
            }
        }
        DynamicValue::Bytes(value) => {
            let mut index = key.try_as_i64()?;

            if index < 0 {
                index += value.len() as i64;
            }

            if index < 0 {
                None
            } else {
                let value =
                    std::str::from_utf8(value).map_err(|_| EvaluationError::UnicodeDecodeError)?;

                value.chars().nth(index as usize).map(DynamicValue::from)
            }
        }
        DynamicValue::List(list) => {
            let mut index = key.try_as_i64()?;

            if index < 0 {
                index += list.len() as i64;
            }

            if index < 0 {
                None
            } else {
                list.get(index as usize).cloned()
            }
        }
        DynamicValue::Map(map) => {
            let key = key.try_as_str()?;

            map.get(key.as_ref()).cloned()
        }
        value => return Err(EvaluationError::from_cast(value, "sequence")),
    })
}

pub fn get(mut args: BoundArguments) -> FunctionResult {
    let (target, key, default) = if args.len() == 3 {
        let (target, key, default) = args.pop3();

        (target, key, Some(default))
    } else {
        let (target, key) = args.pop2();

        (target, key, None)
    };

    match key {
        DynamicValue::List(path) => {
            let mut current = target;

            for step in path.iter() {
                match get_subroutine(&current, step)? {
                    None => return Ok(default.unwrap_or_else(|| DynamicValue::None)),
                    Some(next) => current = next,
                }
            }

            Ok(current)
        }
        _ => Ok(get_subroutine(&target, &key)?
            .unwrap_or_else(|| default.unwrap_or_else(|| DynamicValue::None))),
    }
}

pub fn contains(args: BoundArguments) -> FunctionResult {
    let (arg1, arg2) = args.get2();

    match arg1 {
        DynamicValue::String(text) => match arg2 {
            DynamicValue::Regex(pattern) => Ok(DynamicValue::from(pattern.is_match(text))),
            _ => {
                let pattern = arg2.try_as_str()?;
                Ok(DynamicValue::from(text.contains(pattern.as_ref())))
            }
        },
        DynamicValue::Bytes(bytes) => {
            let text =
                std::str::from_utf8(bytes).map_err(|_| EvaluationError::UnicodeDecodeError)?;

            match arg2 {
                DynamicValue::Regex(pattern) => Ok(DynamicValue::from(pattern.is_match(text))),
                _ => {
                    let pattern = arg2.try_as_str()?;
                    Ok(DynamicValue::from(text.contains(pattern.as_ref())))
                }
            }
        }
        DynamicValue::List(list) => {
            let needle = arg2.try_as_str()?;

            for item in list.iter() {
                if needle == item.try_as_str()? {
                    return Ok(DynamicValue::from(true));
                }
            }

            Ok(DynamicValue::from(false))
        }
        DynamicValue::Map(map) => {
            let needle = arg2.try_as_str()?;

            Ok(DynamicValue::from(map.contains_key(needle.as_ref())))
        }
        value => Err(EvaluationError::from_cast(value, "sequence")),
    }
}

pub fn keys(args: BoundArguments) -> FunctionResult {
    let map = args.get1().try_as_map()?;

    Ok(DynamicValue::from(
        map.keys()
            .map(|k| DynamicValue::from(k.as_str()))
            .collect::<Vec<_>>(),
    ))
}

pub fn values(args: BoundArguments) -> FunctionResult {
    let map = args.get1().try_as_map()?;

    Ok(DynamicValue::from(
        map.values().cloned().collect::<Vec<_>>(),
    ))
}

pub fn index_by(args: BoundArguments) -> FunctionResult {
    let list = args.get1().try_as_list()?;
    let key = args.get(1).unwrap().try_as_str()?;

    let mut map: HashMap<String, DynamicValue> = HashMap::new();

    for item in list {
        let record = item.try_as_map()?;

        if let Some(value) = record.get(key.as_ref()) {
            map.insert(value.try_as_str()?.into_owned(), item.clone());
        }
    }

    Ok(DynamicValue::from(map))
}