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
use std::fmt;
mod numeric_input;
mod text_input;
pub use numeric_input::*;
pub use text_input::*;
pub use structform_derive::*;
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum ParseError {
Required,
InvalidFormat {
required_type: String,
},
FromStrError(String),
NumberOutOfRange {
required_type: String,
min: String,
max: String,
},
}
impl fmt::Display for ParseError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
ParseError::Required => write!(f, "This field is required."),
ParseError::InvalidFormat { required_type } => write!(f, "Expected {}.", required_type),
ParseError::FromStrError(error) => write!(f, "{}.", error),
ParseError::NumberOutOfRange {
required_type,
min,
max,
} => write!(f, "Expected {} between {} and {}.", required_type, min, max),
}
}
}
pub trait StructForm<Model> {
type Field;
fn new(model: &Model) -> Self;
fn set_input(&mut self, field: Self::Field, value: String);
fn submit(&mut self) -> Result<Model, ParseError>;
fn submit_update(&mut self, model: Model) -> Result<Model, ParseError>;
fn submit_attempted(&self) -> bool;
fn is_empty(&self) -> bool;
fn has_unsaved_changes(&self, pristine: &Model) -> bool
where
Self: Clone,
Model: Clone + PartialEq,
{
let mut tmp_form = self.clone();
let updated_model = tmp_form.submit_update(pristine.clone());
match updated_model {
Ok(updated_model) => *pristine != updated_model,
Err(_) => true,
}
}
fn validation_error(&self) -> Option<ParseError>
where
Self: Clone,
{
if self.submit_attempted() {
self.clone().submit().err()
} else {
None
}
}
}
pub trait ParseAndFormat<T> {
fn parse(value: &str) -> Result<T, ParseError>;
fn format(value: &T) -> String;
}
#[macro_export]
macro_rules! derive_form_input {
($input:ident) => {
#[derive(Clone)]
pub struct $input<T> {
pub initial_input: String,
pub input: String,
pub value: Result<T, structform::ParseError>,
pub is_edited: bool,
}
impl<T> Default for $input<T>
where
$input<T>: structform::ParseAndFormat<T>,
{
fn default() -> $input<T> {
$input {
initial_input: String::new(),
input: String::new(),
value: $input::parse(""),
is_edited: false,
}
}
}
impl<T> $input<T> {
pub fn show_validation_msg(&self) -> bool {
self.is_edited && self.value.is_err()
}
pub fn validation_error(&self) -> Option<&structform::ParseError> {
self.value
.as_ref()
.err()
.filter(|_| self.show_validation_msg())
}
pub fn is_empty(&self) -> bool {
self.input.is_empty()
}
}
#[allow(dead_code)]
impl<T> $input<T>
where
$input<T>: structform::ParseAndFormat<T>,
T: Clone,
{
pub fn new(value: &T) -> $input<T> {
let initial_input = Self::format(value);
$input {
initial_input: initial_input.clone(),
input: initial_input,
value: Ok(value.clone()),
is_edited: false,
}
}
pub fn submit(&mut self) -> Result<T, structform::ParseError> {
self.is_edited = true;
self.value.clone()
}
pub fn set_input(&mut self, value: String) {
self.value = Self::parse(&value);
self.input = value;
self.is_edited = true;
}
pub fn clear(&mut self) {
self.initial_input = "".to_string();
self.set_input("".to_string());
self.is_edited = false;
}
}
};
}