-
-
Notifications
You must be signed in to change notification settings - Fork 307
/
slice.cpp
152 lines (128 loc) · 5.3 KB
/
slice.cpp
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
#include "mbgl/style/expression/expression.hpp"
#include <limits>
#include <mbgl/style/conversion_impl.hpp>
#include <mbgl/style/expression/slice.hpp>
#include <mbgl/util/string.hpp>
namespace mbgl {
namespace style {
namespace expression {
namespace {
int normalizeIndex(int index, int length) noexcept {
if (index < 0) {
index += length;
}
return index;
}
} // namespace
Slice::Slice(std::unique_ptr<Expression> input_,
std::unique_ptr<Expression> fromIndex_,
std::unique_ptr<Expression> toIndex_)
: Expression(Kind::Slice, input_->getType(), depsOf(input_) | depsOf(fromIndex_) | depsOf(toIndex_)),
input(std::move(input_)),
fromIndex(std::move(fromIndex_)),
toIndex(std::move(toIndex_)) {}
EvaluationResult Slice::evaluate(const EvaluationContext ¶ms) const {
const EvaluationResult evaluatedInput = input->evaluate(params);
if (!evaluatedInput) {
return evaluatedInput.error();
}
const EvaluationResult evaluatedFromIndex = fromIndex->evaluate(params);
if (!fromIndex) {
return evaluatedFromIndex.error();
}
if (!evaluatedFromIndex->is<double>()) {
return EvaluationError{"Expected value to be of type number, but found " +
toString(typeOf(*evaluatedFromIndex)) + " instead."};
}
int fromIndexValue = static_cast<int>(evaluatedFromIndex->get<double>());
int toIndexValue = std::numeric_limits<int>::max();
if (toIndex) {
const EvaluationResult evaluatedToIndex = toIndex->evaluate(params);
if (!evaluatedToIndex) {
return evaluatedToIndex.error();
}
if (!evaluatedToIndex->is<double>()) {
return EvaluationError{"Expected value to be of type number, but found " +
toString(typeOf(*evaluatedFromIndex)) + " instead."};
}
toIndexValue = static_cast<int>(evaluatedToIndex->get<double>());
}
return evaluatedInput->match(
[&](const std::string &s) { return evaluateForStringInput(s, fromIndexValue, toIndexValue); },
[&](const std::vector<Value> &v) { return evaluateForArrayInput(v, fromIndexValue, toIndexValue); },
[&](const auto &) -> EvaluationResult {
return EvaluationError{"Expected first argument to be of type array or string, but found " +
toString(typeOf(*evaluatedInput)) + " instead."};
});
}
EvaluationResult Slice::evaluateForArrayInput(const std::vector<Value> &array,
int fromIndexValue,
int toIndexValue) const {
int length = static_cast<int>(array.size());
if (toIndexValue == std::numeric_limits<int>::max()) {
toIndexValue = length;
}
fromIndexValue = normalizeIndex(fromIndexValue, length);
toIndexValue = normalizeIndex(toIndexValue, length);
if (fromIndexValue >= toIndexValue) {
return std::vector<Value>{};
}
toIndexValue = std::min(toIndexValue, length);
std::vector<Value> result;
result.reserve(toIndexValue - fromIndexValue);
for (int index = fromIndexValue; index < toIndexValue; ++index) {
result.push_back(array[index]);
}
return result;
}
EvaluationResult Slice::evaluateForStringInput(const std::string &string, int fromIndexValue, int toIndexValue) const {
int length = static_cast<int>(string.size());
if (toIndexValue == std::numeric_limits<int>::max()) {
toIndexValue = length;
}
fromIndexValue = normalizeIndex(fromIndexValue, length);
toIndexValue = normalizeIndex(toIndexValue, length);
if (fromIndexValue >= length) {
return std::string{};
}
return string.substr(fromIndexValue, toIndexValue - fromIndexValue);
}
void Slice::eachChild(const std::function<void(const Expression &)> &visit) const {
visit(*input);
visit(*fromIndex);
if (toIndex) {
visit(*toIndex);
}
}
using namespace mbgl::style::conversion;
ParseResult Slice::parse(const Convertible &value, ParsingContext &ctx) {
assert(isArray(value));
std::size_t length = arrayLength(value);
if (length != 3 && length != 4) {
ctx.error("Expected 2 or 3 arguments, but found " + util::toString(length - 1) + " instead.");
return ParseResult();
}
ParseResult input = ctx.parse(arrayMember(value, 1), 1);
ParseResult fromIndex = ctx.parse(arrayMember(value, 2), 2);
ParseResult toIndex = length == 4 ? ctx.parse(arrayMember(value, 3), 3) : ParseResult();
if (!input || !fromIndex) {
return ParseResult();
}
return ParseResult(
std::make_unique<Slice>(std::move(*input), std::move(*fromIndex), toIndex ? std::move(*toIndex) : nullptr));
}
bool Slice::operator==(const Expression &e) const noexcept {
if (e.getKind() == Kind::Slice) {
auto rhs = static_cast<const Slice *>(&e);
const auto toIndexEqual = (toIndex && rhs->toIndex && *toIndex == *(rhs->toIndex)) ||
(!toIndex && !rhs->toIndex);
return *input == *(rhs->input) && *fromIndex == *(rhs->fromIndex) && toIndexEqual;
}
return false;
}
std::vector<std::optional<Value>> Slice::possibleOutputs() const {
return {std::nullopt};
}
} // namespace expression
} // namespace style
} // namespace mbgl