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
|
//===--- EditorPlaceholder.cpp - Handling for editor placeholders ---------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
///
/// \file
/// Provides info about editor placeholders, <#such as this#>.
///
//===----------------------------------------------------------------------===//
#include "swift/Basic/EditorPlaceholder.h"
#include <optional>
using namespace swift;
// Placeholder text must start with '<#' and end with
// '#>'.
//
// Placeholder kinds:
//
// Typed:
// 'T##' display-string '##' type-string ('##' type-for-expansion-string)?
// 'T##' display-and-type-string
//
// Basic:
// display-string
//
// NOTE: It is required that '##' is not a valid substring of display-string
// or type-string. If this ends up not the case for some reason, we can consider
// adding escaping for '##'.
std::optional<EditorPlaceholderData>
swift::parseEditorPlaceholder(llvm::StringRef PlaceholderText) {
if (!PlaceholderText.starts_with("<#") ||
!PlaceholderText.endswith("#>"))
return std::nullopt;
PlaceholderText = PlaceholderText.drop_front(2).drop_back(2);
EditorPlaceholderData PHDataBasic;
PHDataBasic.Kind = EditorPlaceholderKind::Basic;
PHDataBasic.Display = PlaceholderText;
if (!PlaceholderText.starts_with("T##")) {
// Basic.
return PHDataBasic;
}
// Typed.
EditorPlaceholderData PHDataTyped;
PHDataTyped.Kind = EditorPlaceholderKind::Typed;
assert(PlaceholderText.starts_with("T##"));
PlaceholderText = PlaceholderText.drop_front(3);
size_t Pos = PlaceholderText.find("##");
if (Pos == llvm::StringRef::npos) {
PHDataTyped.Display = PHDataTyped.Type = PHDataTyped.TypeForExpansion =
PlaceholderText;
return PHDataTyped;
}
PHDataTyped.Display = PlaceholderText.substr(0, Pos);
PlaceholderText = PlaceholderText.substr(Pos+2);
Pos = PlaceholderText.find("##");
if (Pos == llvm::StringRef::npos) {
PHDataTyped.Type = PHDataTyped.TypeForExpansion = PlaceholderText;
} else {
PHDataTyped.Type = PlaceholderText.substr(0, Pos);
PHDataTyped.TypeForExpansion = PlaceholderText.substr(Pos+2);
}
return PHDataTyped;
}
bool swift::isEditorPlaceholder(llvm::StringRef IdentifierText) {
return IdentifierText.starts_with("<#");
}
|
