skillet 0.6.3

Skillet: micro expression language (arithmetic, logical, functions, arrays, conditionals, excel formulas) made in Rust bin cli and server
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
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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190

use crate::error::Error;
use crate::types::Value;

/// Handle conversion method calls for all types (Ruby-style)
pub fn exec_conversion_method(name: &str, recv: &Value) -> Result<Value, Error> {
    let lname = name.to_lowercase();
    
    match lname.as_str() {
        "to_s" | "to_string" => to_string(recv),
        "to_i" | "to_int" => to_int(recv),
        "to_f" | "to_float" => to_float(recv),
        "to_a" | "to_array" => to_array(recv),
        "to_json" => to_json(recv),
        "to_bool" | "to_boolean" => to_boolean(recv),
        _ => Err(Error::new(format!("Unknown conversion method: {}", name), None)),
    }
}

/// Convert any value to string
fn to_string(value: &Value) -> Result<Value, Error> {
    let result = match value {
        Value::Null => "".to_string(),
        Value::String(s) => s.clone(),
        Value::Number(n) => {
            if n.fract() == 0.0 {
                format!("{:.0}", n)
            } else {
                n.to_string()
            }
        }
        Value::Boolean(b) => b.to_string(),
        Value::Currency(c) => format!("{:.2}", c),
        Value::Array(arr) => {
            let string_parts: Result<Vec<String>, Error> = arr
                .iter()
                .map(|v| match to_string(v)? {
                    Value::String(s) => Ok(s),
                    _ => unreachable!(),
                })
                .collect();
            format!("[{}]", string_parts?.join(", "))
        }
        Value::Json(s) => s.clone(),
        Value::DateTime(dt) => dt.to_string(),
    };
    Ok(Value::String(result))
}

/// Convert any value to integer
fn to_int(value: &Value) -> Result<Value, Error> {
    let result = match value {
        Value::Null => 0.0,
        Value::Number(n) => n.trunc(),
        Value::Currency(c) => c.trunc(),
        Value::Boolean(b) => if *b { 1.0 } else { 0.0 },
        Value::String(s) => {
            s.trim().parse::<f64>().unwrap_or(0.0).trunc()
        }
        Value::Array(arr) => arr.len() as f64,
        Value::Json(_) => 1.0, // JSON objects are truthy
        Value::DateTime(_) => 1.0, // DateTime values are truthy
    };
    Ok(Value::Number(result))
}

/// Convert any value to float
fn to_float(value: &Value) -> Result<Value, Error> {
    let result = match value {
        Value::Null => 0.0,
        Value::Number(n) => *n,
        Value::Currency(c) => *c,
        Value::Boolean(b) => if *b { 1.0 } else { 0.0 },
        Value::String(s) => {
            s.trim().parse::<f64>().unwrap_or(0.0)
        }
        Value::Array(arr) => arr.len() as f64,
        Value::Json(_) => 1.0,
        Value::DateTime(_) => 1.0,
    };
    Ok(Value::Number(result))
}

/// Convert any value to array
fn to_array(value: &Value) -> Result<Value, Error> {
    let result = match value {
        Value::Null => Vec::new(),
        Value::Array(arr) => arr.clone(),
        Value::String(s) => {
            // Convert string to array of characters
            s.chars().map(|c| Value::String(c.to_string())).collect()
        }
        other => vec![other.clone()],
    };
    Ok(Value::Array(result))
}

/// Convert any value to JSON
fn to_json(value: &Value) -> Result<Value, Error> {
    let json_str = match value {
        Value::Null => "{}".to_string(),
        Value::Json(s) => s.clone(),
        Value::String(s) => {
            let json_val = serde_json::Value::String(s.clone());
            serde_json::to_string(&json_val)
                .map_err(|e| Error::new(format!("Failed to convert to JSON: {}", e), None))?
        }
        Value::Number(n) => {
            let json_val = serde_json::Value::Number(
                serde_json::Number::from_f64(*n)
                    .ok_or_else(|| Error::new("Invalid number for JSON", None))?
            );
            serde_json::to_string(&json_val)
                .map_err(|e| Error::new(format!("Failed to convert to JSON: {}", e), None))?
        }
        Value::Boolean(b) => {
            let json_val = serde_json::Value::Bool(*b);
            serde_json::to_string(&json_val)
                .map_err(|e| Error::new(format!("Failed to convert to JSON: {}", e), None))?
        }
        Value::Array(arr) => {
            let json_array: Result<Vec<serde_json::Value>, Error> = arr
                .iter()
                .map(|v| value_to_json_value(v))
                .collect();
            let json_val = serde_json::Value::Array(json_array?);
            serde_json::to_string(&json_val)
                .map_err(|e| Error::new(format!("Failed to convert to JSON: {}", e), None))?
        }
        Value::Currency(c) => {
            let json_val = serde_json::Value::Number(
                serde_json::Number::from_f64(*c)
                    .ok_or_else(|| Error::new("Invalid currency for JSON", None))?
            );
            serde_json::to_string(&json_val)
                .map_err(|e| Error::new(format!("Failed to convert to JSON: {}", e), None))?
        }
        Value::DateTime(dt) => {
            let json_val = serde_json::Value::String(dt.to_string());
            serde_json::to_string(&json_val)
                .map_err(|e| Error::new(format!("Failed to convert to JSON: {}", e), None))?
        }
    };
    Ok(Value::Json(json_str))
}

/// Convert any value to boolean
fn to_boolean(value: &Value) -> Result<Value, Error> {
    let result = match value {
        Value::Null => false,
        Value::Boolean(b) => *b,
        Value::Number(n) => *n != 0.0,
        Value::Currency(c) => *c != 0.0,
        Value::String(s) => !s.is_empty(),
        Value::Array(arr) => !arr.is_empty(),
        Value::Json(_) => true,
        Value::DateTime(_) => true,
    };
    Ok(Value::Boolean(result))
}

/// Helper function to convert Value to serde_json::Value
fn value_to_json_value(value: &Value) -> Result<serde_json::Value, Error> {
    match value {
        Value::Null => Ok(serde_json::Value::Null),
        Value::String(s) => Ok(serde_json::Value::String(s.clone())),
        Value::Number(n) => {
            serde_json::Number::from_f64(*n)
                .map(serde_json::Value::Number)
                .ok_or_else(|| Error::new("Invalid number for JSON", None))
        }
        Value::Boolean(b) => Ok(serde_json::Value::Bool(*b)),
        Value::Currency(c) => {
            serde_json::Number::from_f64(*c)
                .map(serde_json::Value::Number)
                .ok_or_else(|| Error::new("Invalid currency for JSON", None))
        }
        Value::Array(arr) => {
            let json_array: Result<Vec<serde_json::Value>, Error> = arr
                .iter()
                .map(value_to_json_value)
                .collect();
            Ok(serde_json::Value::Array(json_array?))
        }
        Value::Json(s) => {
            serde_json::from_str(s)
                .map_err(|e| Error::new(format!("Invalid JSON: {}", e), None))
        }
        Value::DateTime(dt) => Ok(serde_json::Value::String(dt.to_string())),
    }
}