Author: sammccall
Date: Tue Nov 21 08:00:53 2017
New Revision: 318774
URL: http://llvm.org/viewvc/llvm-project?rev=318774&view=rev
Log:
[clangd] Add parsing and value inspection to JSONExpr.
Summary:
This will replace the places where we're using YAMLParser to parse JSON now:
- the new marshalling code (T::parse()) should handle fewer cases and require
fewer explicit casts
- we'll early-reject invalid JSON that YAMLParser accepts
- we'll be able to fix protocol-parsing bugs caused by the fact that YAML can
only parse forward
I plan to do the conversion as soon as this lands, but I don't want it in one
patch as the protocol.cpp changes are conflict-prone.
Reviewers: ioeric
Subscribers: ilya-biryukov, cfe-commits
Differential Revision: https://reviews.llvm.org/D40182
Modified:
clang-tools-extra/trunk/clangd/JSONExpr.cpp
clang-tools-extra/trunk/clangd/JSONExpr.h
clang-tools-extra/trunk/unittests/clangd/JSONExprTests.cpp
Modified: clang-tools-extra/trunk/clangd/JSONExpr.cpp
URL:
http://llvm.org/viewvc/llvm-project/clang-tools-extra/trunk/clangd/JSONExpr.cpp?rev=318774&r1=318773&r2=318774&view=diff
==============================================================================
--- clang-tools-extra/trunk/clangd/JSONExpr.cpp (original)
+++ clang-tools-extra/trunk/clangd/JSONExpr.cpp Tue Nov 21 08:00:53 2017
@@ -22,10 +22,10 @@ void Expr::copyFrom(const Expr &M) {
create<std::string>(M.as<std::string>());
break;
case T_Object:
- create<Object>(M.as<Object>());
+ create<ObjectExpr>(M.as<ObjectExpr>());
break;
case T_Array:
- create<Array>(M.as<Array>());
+ create<ArrayExpr>(M.as<ArrayExpr>());
break;
}
}
@@ -46,11 +46,11 @@ void Expr::moveFrom(const Expr &&M) {
M.Type = T_Null;
break;
case T_Object:
- create<Object>(std::move(M.as<Object>()));
+ create<ObjectExpr>(std::move(M.as<ObjectExpr>()));
M.Type = T_Null;
break;
case T_Array:
- create<Array>(std::move(M.as<Array>()));
+ create<ArrayExpr>(std::move(M.as<ArrayExpr>()));
M.Type = T_Null;
break;
}
@@ -69,14 +69,318 @@ void Expr::destroy() {
as<std::string>().~basic_string();
break;
case T_Object:
- as<Object>().~Object();
+ as<ObjectExpr>().~ObjectExpr();
break;
case T_Array:
- as<Array>().~Array();
+ as<ArrayExpr>().~ArrayExpr();
break;
}
}
+namespace {
+// Simple recursive-descent JSON parser.
+class Parser {
+public:
+ Parser(StringRef JSON)
+ : Start(JSON.begin()), P(JSON.begin()), End(JSON.end()) {}
+
+ bool parseExpr(Expr &Out);
+
+ bool assertEnd() {
+ eatWhitespace();
+ if (P == End)
+ return true;
+ return parseError("Text after end of document");
+ }
+
+ Error takeError() {
+ assert(Error);
+ return std::move(*Error);
+ }
+
+private:
+ void eatWhitespace() {
+ while (P != End && (*P == ' ' || *P == '\r' || *P == '\n' || *P == '\t'))
+ ++P;
+ }
+
+ // On invalid syntax, parseX() functions return false and and set Error.
+ bool parseNumber(char First, double &Out);
+ bool parseString(std::string &Out);
+ bool parseUnicode(std::string &Out);
+ bool parseError(const char *Msg); // always returns false
+
+ char next() { return P == End ? 0 : *P++; }
+ char peek() { return P == End ? 0 : *P; }
+ static bool isNumber(char C) {
+ return C == '0' || C == '1' || C == '2' || C == '3' || C == '4' ||
+ C == '5' || C == '6' || C == '7' || C == '8' || C == '9' ||
+ C == 'e' || C == 'E' || C == '+' || C == '-' || C == '.';
+ }
+ static void encodeUtf8(uint32_t Rune, std::string &Out);
+
+ Optional<Error> Error;
+ const char *Start, *P, *End;
+};
+
+bool Parser::parseExpr(Expr &Out) {
+ eatWhitespace();
+ if (P == End)
+ return parseError("Unexpected EOF");
+ switch (char C = next()) {
+ // Bare null/true/false are easy - first char identifies them.
+ case 'n':
+ Out = nullptr;
+ return (next() == 'u' && next() == 'l' && next() == 'l') ||
+ parseError("Invalid bareword");
+ case 't':
+ Out = true;
+ return (next() == 'r' && next() == 'u' && next() == 'e') ||
+ parseError("Invalid bareword");
+ case 'f':
+ Out = false;
+ return (next() == 'a' && next() == 'l' && next() == 's' && next() == 'e')
||
+ parseError("Invalid bareword");
+ case '"': {
+ std::string S;
+ if (parseString(S)) {
+ Out = std::move(S);
+ return true;
+ }
+ return false;
+ }
+ case '[': {
+ Out = json::ary{};
+ json::ary &A = *Out.array();
+ eatWhitespace();
+ if (peek() == ']') {
+ ++P;
+ return true;
+ }
+ for (;;) {
+ A.emplace_back(nullptr);
+ if (!parseExpr(A.back()))
+ return false;
+ eatWhitespace();
+ switch (next()) {
+ case ',':
+ eatWhitespace();
+ continue;
+ case ']':
+ return true;
+ default:
+ return parseError("Expected , or ] after array element");
+ }
+ }
+ }
+ case '{': {
+ Out = json::obj{};
+ json::obj &O = *Out.object();
+ eatWhitespace();
+ if (peek() == '}') {
+ ++P;
+ return true;
+ }
+ for (;;) {
+ if (next() != '"')
+ return parseError("Expected object key");
+ std::string K;
+ if (!parseString(K))
+ return false;
+ eatWhitespace();
+ if (next() != ':')
+ return parseError("Expected : after object key");
+ eatWhitespace();
+ if (!parseExpr(O[std::move(K)]))
+ return false;
+ eatWhitespace();
+ switch (next()) {
+ case ',':
+ eatWhitespace();
+ continue;
+ case '}':
+ return true;
+ default:
+ return parseError("Expected , or } after object property");
+ }
+ }
+ }
+ default:
+ if (isNumber(C)) {
+ double Num;
+ if (parseNumber(C, Num)) {
+ Out = Num;
+ return true;
+ } else {
+ return false;
+ }
+ }
+ return parseError("Expected JSON value");
+ }
+}
+
+bool Parser::parseNumber(char First, double &Out) {
+ SmallString<24> S;
+ S.push_back(First);
+ while (isNumber(peek()))
+ S.push_back(next());
+ char *End;
+ Out = std::strtod(S.c_str(), &End);
+ return End == S.end() || parseError("Invalid number");
+}
+
+bool Parser::parseString(std::string &Out) {
+ // leading quote was already consumed.
+ for (char C = next(); C != '"'; C = next()) {
+ if (LLVM_UNLIKELY(P == End))
+ return parseError("Unterminated string");
+ if (LLVM_UNLIKELY((C & 0x1f) == C))
+ return parseError("Control character in string");
+ if (LLVM_LIKELY(C != '\\')) {
+ Out.push_back(C);
+ continue;
+ }
+ // Handle escape sequence.
+ switch (C = next()) {
+ case '"':
+ case '\\':
+ case '/':
+ Out.push_back(C);
+ break;
+ case 'b':
+ Out.push_back('\b');
+ break;
+ case 'f':
+ Out.push_back('\f');
+ break;
+ case 'n':
+ Out.push_back('\n');
+ break;
+ case 'r':
+ Out.push_back('\r');
+ break;
+ case 't':
+ Out.push_back('\t');
+ break;
+ case 'u':
+ if (!parseUnicode(Out))
+ return false;
+ break;
+ default:
+ return parseError("Invalid escape sequence");
+ }
+ }
+ return true;
+}
+
+void Parser::encodeUtf8(uint32_t Rune, std::string &Out) {
+ if (Rune <= 0x7F) {
+ Out.push_back(Rune & 0x7F);
+ } else if (Rune <= 0x7FF) {
+ uint8_t FirstByte = 0xC0 | ((Rune & 0x7C0) >> 6);
+ uint8_t SecondByte = 0x80 | (Rune & 0x3F);
+ Out.push_back(FirstByte);
+ Out.push_back(SecondByte);
+ } else if (Rune <= 0xFFFF) {
+ uint8_t FirstByte = 0xE0 | ((Rune & 0xF000) >> 12);
+ uint8_t SecondByte = 0x80 | ((Rune & 0xFC0) >> 6);
+ uint8_t ThirdByte = 0x80 | (Rune & 0x3F);
+ Out.push_back(FirstByte);
+ Out.push_back(SecondByte);
+ Out.push_back(ThirdByte);
+ } else if (Rune <= 0x10FFFF) {
+ uint8_t FirstByte = 0xF0 | ((Rune & 0x1F0000) >> 18);
+ uint8_t SecondByte = 0x80 | ((Rune & 0x3F000) >> 12);
+ uint8_t ThirdByte = 0x80 | ((Rune & 0xFC0) >> 6);
+ uint8_t FourthByte = 0x80 | (Rune & 0x3F);
+ Out.push_back(FirstByte);
+ Out.push_back(SecondByte);
+ Out.push_back(ThirdByte);
+ Out.push_back(FourthByte);
+ } else {
+ llvm_unreachable("Invalid codepoint");
+ }
+}
+
+// Parse a \uNNNN escape sequence, the \u have already been consumed.
+// May parse multiple escapes in the presence of surrogate pairs.
+bool Parser::parseUnicode(std::string &Out) {
+ // Note that invalid unicode is not a JSON error. It gets replaced by U+FFFD.
+ auto Invalid = [&] { Out.append(/* UTF-8 */ {'\xef', '\xbf', '\xbd'}); };
+ auto Parse4Hex = [this](uint16_t &Out) {
+ Out = 0;
+ char Bytes[] = {next(), next(), next(), next()};
+ for (unsigned char C : Bytes) {
+ if (!std::isxdigit(C))
+ return parseError("Invalid \\u escape sequence");
+ Out <<= 4;
+ Out |= (C > '9') ? (C & ~0x20) - 'A' + 10 : (C - '0');
+ }
+ return true;
+ };
+ uint16_t First;
+ if (!Parse4Hex(First))
+ return false;
+
+ // We loop to allow proper surrogate-pair error handling.
+ while (true) {
+ if (LLVM_LIKELY(First < 0xD800 || First >= 0xE000)) { // BMP.
+ encodeUtf8(First, Out);
+ return true;
+ }
+
+ if (First >= 0xDC00) {
+ Invalid(); // Lone trailing surrogate.
+ return true;
+ }
+
+ // We have a leading surrogate, and need a trailing one.
+ // Don't advance P: a lone surrogate is valid JSON (but invalid unicode)
+ if (P + 2 > End || *P != '\\' || *(P + 1) != 'u') {
+ Invalid(); // Lone leading not followed by \u...
+ return true;
+ }
+ P += 2;
+ uint16_t Second;
+ if (!Parse4Hex(Second))
+ return false;
+ if (Second < 0xDC00 && Second >= 0xE000) {
+ Invalid(); // Leading surrogate not followed by trailing.
+ First = Second; // Second escape still needs to be processed.
+ continue;
+ }
+
+ // Valid surrogate pair.
+ encodeUtf8(0x10000 | ((First - 0xD800) << 10) | (Second - 0xDC00), Out);
+ return true;
+ }
+}
+
+bool Parser::parseError(const char *Msg) {
+ int Line = 1;
+ const char *StartOfLine = Start;
+ for (const char *X = Start; X < P; ++X) {
+ if (*X == 0x0A) {
+ ++Line;
+ StartOfLine = X + 1;
+ }
+ }
+ Error.emplace(
+ llvm::make_unique<ParseError>(Msg, Line, P - StartOfLine, P - Start));
+ return false;
+}
+} // namespace
+
+Expected<Expr> parse(StringRef JSON) {
+ Parser P(JSON);
+ json::Expr E = nullptr;
+ if (P.parseExpr(E))
+ if (P.assertEnd())
+ return std::move(E);
+ return P.takeError();
+}
+char ParseError::ID = 0;
+
} // namespace json
} // namespace clangd
} // namespace clang
@@ -144,7 +448,7 @@ void clang::clangd::json::Expr::print(ra
bool Comma = false;
OS << '{';
I(Indent);
- for (const auto &P : as<Expr::Object>()) {
+ for (const auto &P : as<Expr::ObjectExpr>()) {
if (Comma)
OS << ',';
Comma = true;
@@ -164,7 +468,7 @@ void clang::clangd::json::Expr::print(ra
bool Comma = false;
OS << '[';
I(Indent);
- for (const auto &E : as<Expr::Array>()) {
+ for (const auto &E : as<Expr::ArrayExpr>()) {
if (Comma)
OS << ',';
Comma = true;
@@ -187,6 +491,25 @@ llvm::raw_ostream &operator<<(raw_ostrea
E.print(OS, [](IndenterAction A) { /*ignore*/ });
return OS;
}
+
+bool operator==(const Expr &L, const Expr &R) {
+ if (L.kind() != R.kind())
+ return false;
+ switch (L.kind()) {
+ case Expr::Null:
+ return L.null() == R.null();
+ case Expr::Boolean:
+ return L.boolean() == R.boolean();
+ case Expr::Number:
+ return L.boolean() == R.boolean();
+ case Expr::String:
+ return L.string() == R.string();
+ case Expr::Array:
+ return *L.array() == *R.array();
+ case Expr::Object:
+ return *L.object() == *R.object();
+ }
+}
} // namespace json
} // namespace clangd
} // namespace clang
Modified: clang-tools-extra/trunk/clangd/JSONExpr.h
URL:
http://llvm.org/viewvc/llvm-project/clang-tools-extra/trunk/clangd/JSONExpr.h?rev=318774&r1=318773&r2=318774&view=diff
==============================================================================
--- clang-tools-extra/trunk/clangd/JSONExpr.h (original)
+++ clang-tools-extra/trunk/clangd/JSONExpr.h Tue Nov 21 08:00:53 2017
@@ -1,4 +1,4 @@
-//===--- JSONExpr.h - composable JSON expressions ---------------*- C++
-*-===//
+//===--- JSONExpr.h - JSON expressions, parsing and serialization - C++
-*-===//
//
// The LLVM Compiler Infrastructure
//
@@ -7,6 +7,8 @@
//
//===---------------------------------------------------------------------===//
+// FIXME: rename to JSON.h now that the scope is wider?
+
#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_JSON_H
#define LLVM_CLANG_TOOLS_EXTRA_CLANGD_JSON_H
@@ -14,6 +16,7 @@
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Error.h"
#include "llvm/Support/FormatVariadic.h"
#include "llvm/Support/raw_ostream.h"
@@ -21,10 +24,12 @@ namespace clang {
namespace clangd {
namespace json {
-// An Expr is an opaque temporary JSON structure used to compose documents.
+// An Expr is an JSON value of unknown type.
// They can be copied, but should generally be moved.
//
-// You can implicitly construct literals from:
+// === Composing expressions ===
+//
+// You can implicitly construct Exprs from:
// - strings: std::string, SmallString, formatv, StringRef, char*
// (char*, and StringRef are references, not copies!)
// - numbers
@@ -39,25 +44,62 @@ namespace json {
// These can be list-initialized, or used to build up collections in a loop.
// json::ary(Collection) converts all items in a collection to Exprs.
//
+// === Inspecting expressions ===
+//
+// Each Expr is one of the JSON kinds:
+// null (nullptr_t)
+// boolean (bool)
+// number (double)
+// string (StringRef)
+// array (json::ary)
+// object (json::obj)
+//
+// The kind can be queried directly, or implicitly via the typed accessors:
+// if (Optional<StringRef> S = E.string())
+// assert(E.kind() == Expr::String);
+//
+// Array and Object also have typed indexing accessors for easy traversal:
+// Expected<Expr> E = parse(R"( {"options": {"font": "sans-serif"}} )");
+// if (json::obj* O = E->object())
+// if (json::obj* Opts = O->object("options"))
+// if (Optional<StringRef> Font = Opts->string("font"))
+// assert(Opts->at("font").kind() == Expr::String);
+//
+// === Serialization ===
+//
// Exprs can be serialized to JSON:
// 1) raw_ostream << Expr // Basic formatting.
// 2) raw_ostream << formatv("{0}", Expr) // Basic formatting.
// 3) raw_ostream << formatv("{0:2}", Expr) // Pretty-print with indent 2.
+//
+// And parsed:
+// Expected<Expr> E = json::parse("[1, 2, null]");
+// assert(E && E->kind() == Expr::Array);
class Expr {
public:
- class Object;
+ enum Kind {
+ Null,
+ Boolean,
+ Number,
+ String,
+ Array,
+ Object,
+ };
+ class ObjectExpr;
class ObjectKey;
- class Array;
+ class ArrayExpr;
// It would be nice to have Expr() be null. But that would make {} null
too...
Expr(const Expr &M) { copyFrom(M); }
Expr(Expr &&M) { moveFrom(std::move(M)); }
// "cheating" move-constructor for moving from initializer_list.
Expr(const Expr &&M) { moveFrom(std::move(M)); }
- Expr(std::initializer_list<Expr> Elements) : Expr(Array(Elements)) {}
- Expr(Array &&Elements) : Type(T_Array) { create<Array>(std::move(Elements));
}
- Expr(Object &&Properties) : Type(T_Object) {
- create<Object>(std::move(Properties));
+ Expr(std::initializer_list<Expr> Elements) : Expr(ArrayExpr(Elements)) {}
+ Expr(ArrayExpr &&Elements) : Type(T_Array) {
+ create<ArrayExpr>(std::move(Elements));
+ }
+ Expr(ObjectExpr &&Properties) : Type(T_Object) {
+ create<ObjectExpr>(std::move(Properties));
}
// Strings: types with value semantics.
Expr(std::string &&V) : Type(T_String) { create<std::string>(std::move(V)); }
@@ -104,6 +146,60 @@ public:
}
~Expr() { destroy(); }
+ Kind kind() const {
+ switch (Type) {
+ case T_Null:
+ return Null;
+ case T_Boolean:
+ return Boolean;
+ case T_Number:
+ return Number;
+ case T_String:
+ case T_StringRef:
+ return String;
+ case T_Object:
+ return Object;
+ case T_Array:
+ return Array;
+ }
+ }
+
+ // Typed accessors return None/nullptr if the Expr is not of this type.
+ llvm::Optional<std::nullptr_t> null() const {
+ if (LLVM_LIKELY(Type == T_Null))
+ return nullptr;
+ return llvm::None;
+ }
+ llvm::Optional<bool> boolean() const {
+ if (LLVM_LIKELY(Type == T_Null))
+ return as<bool>();
+ return llvm::None;
+ }
+ llvm::Optional<double> number() const {
+ if (LLVM_LIKELY(Type == T_Number))
+ return as<double>();
+ return llvm::None;
+ }
+ llvm::Optional<llvm::StringRef> string() const {
+ if (Type == T_String)
+ return llvm::StringRef(as<std::string>());
+ if (LLVM_LIKELY(Type == T_StringRef))
+ return as<llvm::StringRef>();
+ return llvm::None;
+ }
+ const ObjectExpr *object() const {
+ return LLVM_LIKELY(Type == T_Object) ? &as<ObjectExpr>() : nullptr;
+ }
+ ObjectExpr *object() {
+ return LLVM_LIKELY(Type == T_Object) ? &as<ObjectExpr>() : nullptr;
+ }
+ const ArrayExpr *array() const {
+ return LLVM_LIKELY(Type == T_Array) ? &as<ArrayExpr>() : nullptr;
+ }
+ ArrayExpr *array() {
+ return LLVM_LIKELY(Type == T_Array) ? &as<ArrayExpr>() : nullptr;
+ }
+
friend llvm::raw_ostream &operator<<(llvm::raw_ostream &, const Expr &);
private:
@@ -137,10 +233,8 @@ private:
mutable ExprType Type;
public:
- // ObjectKey is a used to capture keys in Expr::Objects. It's like Expr but:
+ // ObjectKey is a used to capture keys in Expr::ObjectExpr. Like Expr but:
// - only strings are allowed
- // - it's copyable (for std::map)
- // - we're slightly more eager to copy, to allow efficient key compares
// - it's optimized for the string literal case (Owned == nullptr)
class ObjectKey {
public:
@@ -183,12 +277,12 @@ public:
llvm::StringRef Data;
};
- class Object : public std::map<ObjectKey, Expr> {
+ class ObjectExpr : public std::map<ObjectKey, Expr> {
public:
- explicit Object() {}
+ explicit ObjectExpr() {}
// Use a custom struct for list-init, because pair forces extra copies.
struct KV;
- explicit Object(std::initializer_list<KV> Properties);
+ explicit ObjectExpr(std::initializer_list<KV> Properties);
// Allow [] as if Expr was default-constructible as null.
Expr &operator[](const ObjectKey &K) {
@@ -199,15 +293,15 @@ public:
}
};
- class Array : public std::vector<Expr> {
+ class ArrayExpr : public std::vector<Expr> {
public:
- explicit Array() {}
- explicit Array(std::initializer_list<Expr> Elements) {
+ explicit ArrayExpr() {}
+ explicit ArrayExpr(std::initializer_list<Expr> Elements) {
reserve(Elements.size());
for (const Expr &V : Elements)
emplace_back(std::move(V));
};
- template <typename Collection> explicit Array(const Collection &C) {
+ template <typename Collection> explicit ArrayExpr(const Collection &C) {
for (const auto &V : C)
emplace_back(V);
}
@@ -215,23 +309,50 @@ public:
private:
mutable llvm::AlignedCharArrayUnion<bool, double, llvm::StringRef,
- std::string, Array, Object>
+ std::string, ArrayExpr, ObjectExpr>
Union;
};
-struct Expr::Object::KV {
+bool operator==(const Expr &, const Expr &);
+inline bool operator!=(const Expr &L, const Expr &R) { return !(L == R); }
+inline bool operator==(const Expr::ObjectKey &L, const Expr::ObjectKey &R) {
+ return llvm::StringRef(L) == llvm::StringRef(R);
+}
+inline bool operator!=(const Expr::ObjectKey &L, const Expr::ObjectKey &R) {
+ return !(L == R);
+}
+
+struct Expr::ObjectExpr::KV {
ObjectKey K;
Expr V;
};
-inline Expr::Object::Object(std::initializer_list<KV> Properties) {
+inline Expr::ObjectExpr::ObjectExpr(std::initializer_list<KV> Properties) {
for (const auto &P : Properties)
emplace(std::move(P.K), std::move(P.V));
}
// Give Expr::{Object,Array} more convenient names for literal use.
-using obj = Expr::Object;
-using ary = Expr::Array;
+using obj = Expr::ObjectExpr;
+using ary = Expr::ArrayExpr;
+
+llvm::Expected<Expr> parse(llvm::StringRef JSON);
+
+class ParseError : public llvm::ErrorInfo<ParseError> {
+ const char *Msg;
+ unsigned Line, Column, Offset;
+
+public:
+ static char ID;
+ ParseError(const char *Msg, unsigned Line, unsigned Column, unsigned Offset)
+ : Msg(Msg), Line(Line), Column(Column), Offset(Offset) {}
+ void log(llvm::raw_ostream &OS) const override {
+ OS << llvm::formatv("[{0}:{1}, byte={2}]: {3}", Line, Column, Offset, Msg);
+ }
+ std::error_code convertToErrorCode() const override {
+ return llvm::inconvertibleErrorCode();
+ }
+};
} // namespace json
} // namespace clangd
Modified: clang-tools-extra/trunk/unittests/clangd/JSONExprTests.cpp
URL:
http://llvm.org/viewvc/llvm-project/clang-tools-extra/trunk/unittests/clangd/JSONExprTests.cpp?rev=318774&r1=318773&r2=318774&view=diff
==============================================================================
--- clang-tools-extra/trunk/unittests/clangd/JSONExprTests.cpp (original)
+++ clang-tools-extra/trunk/unittests/clangd/JSONExprTests.cpp Tue Nov 21
08:00:53 2017
@@ -15,6 +15,9 @@
namespace clang {
namespace clangd {
namespace json {
+void PrintTo(const Expr &E, std::ostream *OS) {
+ llvm::raw_os_ostream(*OS) << llvm::formatv("{0:2}", E);
+}
namespace {
std::string s(const Expr &E) { return llvm::formatv("{0}", E).str(); }
@@ -108,6 +111,77 @@ TEST(JSONExprTests, PrettyPrinting) {
}));
}
+TEST(JSONTest, Parse) {
+ auto Compare = [](llvm::StringRef S, Expr Expected) {
+ if (auto E = parse(S)) {
+ // Compare both string forms and with operator==, in case we have bugs.
+ EXPECT_EQ(*E, Expected);
+ EXPECT_EQ(sp(*E), sp(Expected));
+ } else {
+ handleAllErrors(E.takeError(), [S](const llvm::ErrorInfoBase &E) {
+ FAIL() << "Failed to parse JSON >>> " << S << " <<<: " << E.message();
+ });
+ }
+ };
+
+ Compare(R"(true)", true);
+ Compare(R"(false)", false);
+ Compare(R"(null)", nullptr);
+
+ Compare(R"(42)", 42);
+ Compare(R"(2.5)", 2.5);
+ Compare(R"(2e50)", 2e50);
+ Compare(R"(1.2e3456789)", 1.0 / 0.0);
+
+ Compare(R"("foo")", "foo");
+ Compare(R"("\"\\\b\f\n\r\t")", "\"\\\b\f\n\r\t");
+ Compare(R"("\u0000")", llvm::StringRef("\0", 1));
+ Compare("\"\x7f\"", "\x7f");
+ Compare(R"("\ud801\udc37")", "\U00010437"); // UTF16 surrogate pair escape.
+ Compare("\"\xE2\x82\xAC\xF0\x9D\x84\x9E\"", "\u20ac\U0001d11e"); // UTF8
+ Compare(R"("\ud801")", "\ufffd"); // Invalid codepoint.
+
+ Compare(R"({"":0,"":0})", obj{{"", 0}});
+ Compare(R"({"obj":{},"arr":[]})", obj{{"obj", obj{}}, {"arr", {}}});
+ Compare(R"({"\n":{"\u0000":[[[[]]]]}})",
+ obj{{"\n", obj{
+ {llvm::StringRef("\0", 1), {{{{}}}}},
+ }}});
+ Compare("\r[\n\t] ", {});
+}
+
+TEST(JSONTest, ParseErrors) {
+ auto ExpectErr = [](llvm::StringRef Msg, llvm::StringRef S) {
+ if (auto E = parse(S)) {
+ // Compare both string forms and with operator==, in case we have bugs.
+ FAIL() << "Parsed JSON >>> " << S << " <<< but wanted error: " << Msg;
+ } else {
+ handleAllErrors(E.takeError(), [S, Msg](const llvm::ErrorInfoBase &E) {
+ EXPECT_THAT(E.message(), testing::HasSubstr(Msg)) << S;
+ });
+ }
+ };
+ ExpectErr("Unexpected EOF", "");
+ ExpectErr("Unexpected EOF", "[");
+ ExpectErr("Text after end of document", "[][]");
+ ExpectErr("Text after end of document", "[][]");
+ ExpectErr("Invalid bareword", "fuzzy");
+ ExpectErr("Expected , or ]", "[2?]");
+ ExpectErr("Expected object key", "{a:2}");
+ ExpectErr("Expected : after object key", R"({"a",2})");
+ ExpectErr("Expected , or } after object property", R"({"a":2 "b":3})");
+ ExpectErr("Expected JSON value", R"([&%!])");
+ ExpectErr("Invalid number", "1e1.0");
+ ExpectErr("Unterminated string", R"("abc\"def)");
+ ExpectErr("Control character in string", "\"abc\ndef\"");
+ ExpectErr("Invalid escape sequence", R"("\030")");
+ ExpectErr("Invalid \\u escape sequence", R"("\usuck")");
+ ExpectErr("[3:3, byte=19]", R"({
+ "valid": 1,
+ invalid: 2
+})");
+}
+
} // namespace
} // namespace json
} // namespace clangd
_______________________________________________
cfe-commits mailing list
cfe-commits@lists.llvm.org
http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
