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
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
use super::{is_function_name, is_not, CallArgs, CssString};
use crate::error::Error;
use crate::ordermap::OrderMap;
use crate::output::{Format, Formatted};
use crate::sass::Function;
use crate::value::{Color, ListSeparator, Number, Numeric, Operator};
use std::convert::TryInto;
/// A css value.
#[derive(Clone, Debug, Eq, PartialOrd)]
pub enum Value {
/// A special kind of escape. Only really used for !important.
Bang(String),
/// An function call that was not evaluated.
Call(String, CallArgs),
/// A (callable?) function.
Function(String, Option<Function>),
/// A string literal.
Literal(CssString),
/// A comma- or space separated list of values, with or without brackets.
List(Vec<Value>, Option<ListSeparator>, bool),
/// A Numeric value is a rational value with a Unit (which may be
/// Unit::None) and flags.
///
/// The boolean flag is true for calculated values and false for
/// literal values.
Numeric(Numeric, bool),
/// A color value (and optionally, its source string).
Color(Color, Option<String>),
/// The null value.
Null,
/// The true boolean value.
True,
/// The false boolean value.
False,
/// A binary operation, two operands and an operator.
/// The booleans represents possible whitespace.
BinOp(Box<Value>, bool, Operator, bool, Box<Value>),
/// A unary operator and its operand.
UnaryOp(Operator, Box<Value>),
/// A map of values.
Map(ValueMap),
/// A unicode range for font selections. U+NN, U+N?, U+NN-MM.
/// The string is the entire value, including the "U+" tag.
UnicodeRange(String),
/// A value in parenthesis.
Paren(Box<Value>),
/// An argumentt list
ArgList(super::CallArgs),
}
/// An OrderMap where both the keys and the values are css values.
pub type ValueMap = OrderMap<Value, Value>;
impl Value {
/// Create a numeric value with no unit.
pub fn scalar<T: Into<Number>>(v: T) -> Self {
Value::Numeric(Numeric::scalar(v), true)
}
/// Get the type name of this value.
pub fn type_name(&self) -> &'static str {
match *self {
Value::ArgList(..) => "arglist",
Value::Call(ref name, _) if is_function_name(name) => {
"calculation"
}
Value::Call(..) => "string",
Value::Color(..) => "color",
Value::Literal(ref s) if s.is_css_calc() => "calculation",
Value::Literal(..) => "string",
Value::Map(..) => "map",
Value::Numeric(..) => "number",
Value::List(..) => "list",
Value::Function(..) => "function",
Value::True | Value::False => "bool",
Value::Null => "null",
_ => "unknown",
}
}
/// Return true if this is a calculated value.
///
/// The return of functions or operators are calculated, verbatim
/// values are not.
pub fn is_calculated(&self) -> bool {
match *self {
Value::Numeric(.., calculated) => calculated,
Value::Color(_, None) => true,
_ => false,
}
}
/// Get this value, but marked as calculated.
///
/// Make sure arithmetic operators are evaluated.
pub fn into_calculated(self) -> Self {
match self {
Value::Numeric(num, _) => Value::Numeric(num, true),
Value::BinOp(a, s1, op, s2, b) => {
match op.eval((&*a).clone().into_calculated(), (&*b).clone())
{
Some(v) => v,
None => Value::BinOp(a, s1, op, s2, b),
}
}
other => other,
}
}
/// All values other than `False` and `Null` should be considered true.
pub fn is_true(&self) -> bool {
!matches!(self, Value::False | Value::Null)
}
/// Return true if this value is null.
///
/// Note that an empty unquoted string and a list containing no
/// non-null values is also considered null.
pub fn is_null(&self) -> bool {
match *self {
Value::Null => true,
Value::List(ref list, _, false) => {
list.iter().all(|v| v.is_null())
}
Value::Literal(ref s) => s.is_null(),
Value::Paren(ref v) => v.is_null(),
_ => false,
}
}
/// Check if this value is numeric.
///
/// If it is, get the number and unit, otherwise, get the value
/// itself as error.
pub fn numeric_value(self) -> Result<Numeric, Self> {
match self {
Value::Numeric(num, ..) => Ok(num),
v => Err(v),
}
}
/// Check that this value is an integer.
#[deprecated]
pub fn integer_value(&self) -> Result<i64, Error> {
match self {
&Value::Numeric(ref num, ..) => num
.value
.clone()
.into_integer()
.map_err(|_| Error::bad_value("an integer", self)),
v => Err(Error::bad_value("a number", v)),
}
}
/// Unquote this value.
///
/// If the value is a quoted string, the content is unquoted.
pub fn unquote(self) -> Value {
match self {
Value::Literal(s) => s.unquote().into(),
Value::List(list, s, b) => Value::List(
list.into_iter().map(|v| v.unquote()).collect(),
s,
b,
),
Value::Paren(v) => *v,
v => v,
}
}
/// Get this value as iterable items.
///
/// Lists and maps have iterable items, which are returned as a
/// vector of values. Other values are returned as a vec
/// containing the value as a single item.
pub fn iter_items(self) -> Vec<Value> {
match self {
Value::ArgList(args) => {
let mut vec = args.positional;
// I'm not sure that including the named arguments after the
// positional is the right thing to do here.
vec.extend(args.named.into_iter().map(|(k, v)| {
Value::List(
vec![Value::from(k.as_ref()), v],
Some(ListSeparator::Space),
false,
)
}));
vec
}
Value::List(v, _, _) => v,
Value::Map(map) => map
.iter()
.map(|&(ref k, ref v)| {
Value::List(
vec![k.clone(), v.clone()],
Some(ListSeparator::Space),
false,
)
})
.collect(),
Value::Paren(v) => v.iter_items(),
v => vec![v],
}
}
/// Get a reference to this `Value` bound to an output format.
///
/// The bound referene implements `Display`, so it can be written
/// with the rust `format!(...) macros or coverted with the
/// `to_string()` method.
///
/// # Example
///
/// ```
/// # use rsass::css::Value;
/// assert_eq!(
/// Value::scalar(42).format(Default::default()).to_string(),
/// "42",
/// );
/// ```
pub fn format(&self, format: Format) -> Formatted<Value> {
Formatted {
value: self,
format,
}
}
}
/// Some Values are equal according to spec even with some
/// implementation differences.
impl PartialEq for Value {
fn eq(&self, other: &Value) -> bool {
match (&self, other) {
(Value::Bang(a), Value::Bang(b)) => a == b,
(Value::Numeric(a, _), Value::Numeric(b, _)) => a == b,
(Value::Literal(a), Value::Literal(b)) => a == b,
(Value::Null, Value::Null) => true,
(Value::True, Value::True) => true,
(Value::False, Value::False) => true,
(Value::Color(a, _), Value::Color(b, _)) => a == b,
(Value::Call(af, aa), Value::Call(bf, ba)) => {
af == bf && aa == ba
}
(Value::Function(a, abody), Value::Function(b, bbody)) => {
a == b && abody == bbody
}
(Value::List(av, asep, ab), Value::List(bv, bsep, bb)) => {
av == bv && asep == bsep && ab == bb
}
(Value::Map(a), Value::Map(b)) => a == b,
(Value::UnaryOp(a, av), Value::UnaryOp(b, bv)) => {
a == b && av == bv
}
(
Value::BinOp(aa, _, ao, _, ab),
Value::BinOp(ba, _, bo, _, bb),
) => ao == bo && aa == ba && ab == bb,
(Value::UnicodeRange(a), Value::UnicodeRange(b)) => a == b,
(Value::Paren(a), Value::Paren(b)) => a == b,
(Value::List(a, ..), Value::Map(b)) => {
a.is_empty() && b.is_empty()
}
(Value::Map(a), Value::List(b, ..)) => {
a.is_empty() && b.is_empty()
}
_ => false,
}
}
}
impl From<bool> for Value {
fn from(v: bool) -> Value {
match v {
true => Value::True,
false => Value::False,
}
}
}
impl From<CssString> for Value {
fn from(s: CssString) -> Value {
Value::Literal(s.pref_dquotes())
}
}
impl From<&str> for Value {
fn from(s: &str) -> Value {
String::from(s).into()
}
}
impl From<String> for Value {
fn from(s: String) -> Value {
CssString::from(s).into()
}
}
impl From<Numeric> for Value {
fn from(v: Numeric) -> Value {
Value::Numeric(v, true)
}
}
impl<C: Into<Color>> From<C> for Value {
fn from(c: C) -> Value {
Value::Color(c.into(), None)
}
}
impl TryInto<OrderMap<CssString, Value>> for Value {
type Error = ValueToMapError;
fn try_into(self) -> Result<OrderMap<CssString, Value>, ValueToMapError> {
match self {
Value::Map(m) => m
.into_iter()
.map(|(k, v)| match (k, v) {
(Value::Literal(k), v) => Ok((k, v)),
(k, _v) => {
Err(ValueToMapError::Key(is_not(&k, "a string")))
}
})
.collect(),
// An empty map and an empty list looks the same
Value::List(ref l, ..) if l.is_empty() => Ok(OrderMap::new()),
v => Err(ValueToMapError::Root(is_not(&v, "a map"))),
}
}
}
/// Specific error type for converting a Value to an OrderMap.
#[derive(Debug)]
pub enum ValueToMapError {
/// The Value was not convertible to a ValueMap.
Root(String),
/// One key value was not convertible to the key type.
Key(String),
}