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1 //===--- CodeCompletionStrings.cpp -------------------------------*- C++-*-===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #include "CodeCompletionStrings.h"
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10 #include "clang/AST/ASTContext.h"
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11 #include "clang/AST/DeclObjC.h"
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12 #include "clang/AST/RawCommentList.h"
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13 #include "clang/Basic/SourceManager.h"
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14 #include "clang/Sema/CodeCompleteConsumer.h"
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15 #include <limits>
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16 #include <utility>
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17
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18 namespace clang {
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19 namespace clangd {
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20 namespace {
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21
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22 bool isInformativeQualifierChunk(CodeCompletionString::Chunk const &Chunk) {
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23 return Chunk.Kind == CodeCompletionString::CK_Informative &&
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24 llvm::StringRef(Chunk.Text).endswith("::");
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25 }
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26
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27 void appendEscapeSnippet(const llvm::StringRef Text, std::string *Out) {
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28 for (const auto Character : Text) {
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29 if (Character == '$' || Character == '}' || Character == '\\')
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30 Out->push_back('\\');
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31 Out->push_back(Character);
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32 }
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33 }
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34
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35 void appendOptionalChunk(const CodeCompletionString &CCS, std::string *Out) {
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36 for (const CodeCompletionString::Chunk &C : CCS) {
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37 switch (C.Kind) {
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38 case CodeCompletionString::CK_Optional:
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39 assert(C.Optional &&
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40 "Expected the optional code completion string to be non-null.");
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41 appendOptionalChunk(*C.Optional, Out);
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42 break;
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43 default:
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44 *Out += C.Text;
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45 break;
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46 }
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47 }
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48 }
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49
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50 bool looksLikeDocComment(llvm::StringRef CommentText) {
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51 // We don't report comments that only contain "special" chars.
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52 // This avoids reporting various delimiters, like:
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53 // =================
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54 // -----------------
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55 // *****************
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56 return CommentText.find_first_not_of("/*-= \t\r\n") != llvm::StringRef::npos;
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57 }
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58
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59 } // namespace
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60
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61 std::string getDocComment(const ASTContext &Ctx,
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62 const CodeCompletionResult &Result,
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63 bool CommentsFromHeaders) {
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64 // FIXME: clang's completion also returns documentation for RK_Pattern if they
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65 // contain a pattern for ObjC properties. Unfortunately, there is no API to
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66 // get this declaration, so we don't show documentation in that case.
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67 if (Result.Kind != CodeCompletionResult::RK_Declaration)
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68 return "";
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69 return Result.getDeclaration() ? getDeclComment(Ctx, *Result.getDeclaration())
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70 : "";
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71 }
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72
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73 std::string getDeclComment(const ASTContext &Ctx, const NamedDecl &Decl) {
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74 if (isa<NamespaceDecl>(Decl)) {
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75 // Namespaces often have too many redecls for any particular redecl comment
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76 // to be useful. Moreover, we often confuse file headers or generated
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77 // comments with namespace comments. Therefore we choose to just ignore
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78 // the comments for namespaces.
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79 return "";
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80 }
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81 const RawComment *RC = getCompletionComment(Ctx, &Decl);
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82 if (!RC)
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83 return "";
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84 // Sanity check that the comment does not come from the PCH. We choose to not
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85 // write them into PCH, because they are racy and slow to load.
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86 assert(!Ctx.getSourceManager().isLoadedSourceLocation(RC->getBeginLoc()));
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87 std::string Doc =
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88 RC->getFormattedText(Ctx.getSourceManager(), Ctx.getDiagnostics());
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89 return looksLikeDocComment(Doc) ? Doc : "";
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90 }
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91
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92 void getSignature(const CodeCompletionString &CCS, std::string *Signature,
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93 std::string *Snippet, std::string *RequiredQualifiers,
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94 bool CompletingPattern) {
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95 // Placeholder with this index will be ${0:…} to mark final cursor position.
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96 // Usually we do not add $0, so the cursor is placed at end of completed text.
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97 unsigned CursorSnippetArg = std::numeric_limits<unsigned>::max();
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98 if (CompletingPattern) {
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99 // In patterns, it's best to place the cursor at the last placeholder, to
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100 // handle cases like
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101 // namespace ${1:name} {
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102 // ${0:decls}
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103 // }
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104 CursorSnippetArg =
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105 llvm::count_if(CCS, [](const CodeCompletionString::Chunk &C) {
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106 return C.Kind == CodeCompletionString::CK_Placeholder;
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107 });
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108 }
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109 unsigned SnippetArg = 0;
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110 bool HadObjCArguments = false;
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111 for (const auto &Chunk : CCS) {
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112 // Informative qualifier chunks only clutter completion results, skip
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113 // them.
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114 if (isInformativeQualifierChunk(Chunk))
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115 continue;
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116
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117 switch (Chunk.Kind) {
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118 case CodeCompletionString::CK_TypedText:
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119 // The typed-text chunk is the actual name. We don't record this chunk.
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120 // C++:
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121 // In general our string looks like <qualifiers><name><signature>.
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122 // So once we see the name, any text we recorded so far should be
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123 // reclassified as qualifiers.
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124 //
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125 // Objective-C:
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126 // Objective-C methods may have multiple typed-text chunks, so we must
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127 // treat them carefully. For Objective-C methods, all typed-text chunks
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128 // will end in ':' (unless there are no arguments, in which case we
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129 // can safely treat them as C++).
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130 if (!llvm::StringRef(Chunk.Text).endswith(":")) { // Treat as C++.
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131 if (RequiredQualifiers)
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132 *RequiredQualifiers = std::move(*Signature);
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133 Signature->clear();
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134 Snippet->clear();
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135 } else { // Objective-C method with args.
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136 // If this is the first TypedText to the Objective-C method, discard any
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137 // text that we've previously seen (such as previous parameter selector,
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138 // which will be marked as Informative text).
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139 //
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140 // TODO: Make previous parameters part of the signature for Objective-C
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141 // methods.
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142 if (!HadObjCArguments) {
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143 HadObjCArguments = true;
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144 Signature->clear();
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145 } else { // Subsequent argument, considered part of snippet/signature.
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146 *Signature += Chunk.Text;
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147 *Snippet += Chunk.Text;
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148 }
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149 }
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150 break;
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151 case CodeCompletionString::CK_Text:
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152 *Signature += Chunk.Text;
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153 *Snippet += Chunk.Text;
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154 break;
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155 case CodeCompletionString::CK_Optional:
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156 assert(Chunk.Optional);
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157 // No need to create placeholders for default arguments in Snippet.
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158 appendOptionalChunk(*Chunk.Optional, Signature);
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159 break;
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160 case CodeCompletionString::CK_Placeholder:
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161 *Signature += Chunk.Text;
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162 ++SnippetArg;
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163 *Snippet +=
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164 "${" +
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165 std::to_string(SnippetArg == CursorSnippetArg ? 0 : SnippetArg) + ':';
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166 appendEscapeSnippet(Chunk.Text, Snippet);
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167 *Snippet += '}';
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168 break;
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169 case CodeCompletionString::CK_Informative:
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170 // For example, the word "const" for a const method, or the name of
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171 // the base class for methods that are part of the base class.
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172 *Signature += Chunk.Text;
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173 // Don't put the informative chunks in the snippet.
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174 break;
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175 case CodeCompletionString::CK_ResultType:
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176 // This is not part of the signature.
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177 break;
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178 case CodeCompletionString::CK_CurrentParameter:
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179 // This should never be present while collecting completion items,
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180 // only while collecting overload candidates.
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181 llvm_unreachable("Unexpected CK_CurrentParameter while collecting "
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182 "CompletionItems");
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183 break;
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184 case CodeCompletionString::CK_LeftParen:
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185 case CodeCompletionString::CK_RightParen:
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186 case CodeCompletionString::CK_LeftBracket:
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187 case CodeCompletionString::CK_RightBracket:
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188 case CodeCompletionString::CK_LeftBrace:
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189 case CodeCompletionString::CK_RightBrace:
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190 case CodeCompletionString::CK_LeftAngle:
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191 case CodeCompletionString::CK_RightAngle:
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192 case CodeCompletionString::CK_Comma:
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193 case CodeCompletionString::CK_Colon:
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194 case CodeCompletionString::CK_SemiColon:
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195 case CodeCompletionString::CK_Equal:
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196 case CodeCompletionString::CK_HorizontalSpace:
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197 *Signature += Chunk.Text;
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198 *Snippet += Chunk.Text;
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199 break;
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200 case CodeCompletionString::CK_VerticalSpace:
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201 *Snippet += Chunk.Text;
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202 // Don't even add a space to the signature.
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203 break;
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204 }
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205 }
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206 }
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207
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208 std::string formatDocumentation(const CodeCompletionString &CCS,
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209 llvm::StringRef DocComment) {
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210 // Things like __attribute__((nonnull(1,3))) and [[noreturn]]. Present this
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211 // information in the documentation field.
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212 std::string Result;
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213 const unsigned AnnotationCount = CCS.getAnnotationCount();
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214 if (AnnotationCount > 0) {
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215 Result += "Annotation";
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216 if (AnnotationCount == 1) {
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217 Result += ": ";
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218 } else /* AnnotationCount > 1 */ {
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219 Result += "s: ";
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220 }
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221 for (unsigned I = 0; I < AnnotationCount; ++I) {
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222 Result += CCS.getAnnotation(I);
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223 Result.push_back(I == AnnotationCount - 1 ? '\n' : ' ');
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224 }
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225 }
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226 // Add brief documentation (if there is any).
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227 if (!DocComment.empty()) {
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228 if (!Result.empty()) {
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229 // This means we previously added annotations. Add an extra newline
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230 // character to make the annotations stand out.
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231 Result.push_back('\n');
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232 }
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233 Result += DocComment;
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234 }
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235 return Result;
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236 }
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237
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238 std::string getReturnType(const CodeCompletionString &CCS) {
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239 for (const auto &Chunk : CCS)
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240 if (Chunk.Kind == CodeCompletionString::CK_ResultType)
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241 return Chunk.Text;
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242 return "";
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243 }
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244
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245 } // namespace clangd
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246 } // namespace clang
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