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llvm-project/lldb/tools/debugserver/source/JSON.cpp
Chandler Carruth 2946cd7010 Update the file headers across all of the LLVM projects in the monorepo 
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00

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//===--------------------- JSON.cpp -----------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "JSON.h"
// C includes
#include <assert.h>
#include <limits.h>
// C++ includes
#include "lldb/Host/StringConvert.h"
#include <iomanip>
#include <sstream>
using namespace lldb_private;
std::string JSONString::json_string_quote_metachars(const std::string &s) {
if (s.find('"') == std::string::npos)
return s;
std::string output;
const size_t s_size = s.size();
const char *s_chars = s.c_str();
for (size_t i = 0; i < s_size; i++) {
unsigned char ch = *(s_chars + i);
if (ch == '"') {
output.push_back('\\');
}
output.push_back(ch);
}
return output;
}
JSONString::JSONString() : JSONValue(JSONValue::Kind::String), m_data() {}
JSONString::JSONString(const char *s)
: JSONValue(JSONValue::Kind::String), m_data(s ? s : "") {}
JSONString::JSONString(const std::string &s)
: JSONValue(JSONValue::Kind::String), m_data(s) {}
void JSONString::Write(std::ostream &s) {
s << "\"" << json_string_quote_metachars(m_data).c_str() << "\"";
}
uint64_t JSONNumber::GetAsUnsigned() const {
switch (m_data_type) {
case DataType::Unsigned:
return m_data.m_unsigned;
case DataType::Signed:
return (uint64_t)m_data.m_signed;
case DataType::Double:
return (uint64_t)m_data.m_double;
}
}
int64_t JSONNumber::GetAsSigned() const {
switch (m_data_type) {
case DataType::Unsigned:
return (int64_t)m_data.m_unsigned;
case DataType::Signed:
return m_data.m_signed;
case DataType::Double:
return (int64_t)m_data.m_double;
}
}
double JSONNumber::GetAsDouble() const {
switch (m_data_type) {
case DataType::Unsigned:
return (double)m_data.m_unsigned;
case DataType::Signed:
return (double)m_data.m_signed;
case DataType::Double:
return m_data.m_double;
}
}
void JSONNumber::Write(std::ostream &s) {
switch (m_data_type) {
case DataType::Unsigned:
s << m_data.m_unsigned;
break;
case DataType::Signed:
s << m_data.m_signed;
break;
case DataType::Double:
// Set max precision to emulate %g.
s << std::setprecision(std::numeric_limits<double>::digits10 + 1);
s << m_data.m_double;
break;
}
}
JSONTrue::JSONTrue() : JSONValue(JSONValue::Kind::True) {}
void JSONTrue::Write(std::ostream &s) { s << "true"; }
JSONFalse::JSONFalse() : JSONValue(JSONValue::Kind::False) {}
void JSONFalse::Write(std::ostream &s) { s << "false"; }
JSONNull::JSONNull() : JSONValue(JSONValue::Kind::Null) {}
void JSONNull::Write(std::ostream &s) { s << "null"; }
JSONObject::JSONObject() : JSONValue(JSONValue::Kind::Object) {}
void JSONObject::Write(std::ostream &s) {
bool first = true;
s << '{';
auto iter = m_elements.begin(), end = m_elements.end();
for (; iter != end; iter++) {
if (first)
first = false;
else
s << ',';
JSONString key(iter->first);
JSONValue::SP value(iter->second);
key.Write(s);
s << ':';
value->Write(s);
}
s << '}';
}
bool JSONObject::SetObject(const std::string &key, JSONValue::SP value) {
if (key.empty() || nullptr == value.get())
return false;
m_elements[key] = value;
return true;
}
JSONValue::SP JSONObject::GetObject(const std::string &key) const {
auto iter = m_elements.find(key), end = m_elements.end();
if (iter == end)
return JSONValue::SP();
return iter->second;
}
bool JSONObject::GetObjectAsBool(const std::string &key, bool &value) const {
auto value_sp = GetObject(key);
if (!value_sp) {
// The given key doesn't exist, so we have no value.
return false;
}
if (JSONTrue::classof(value_sp.get())) {
// We have the value, and it is true.
value = true;
return true;
} else if (JSONFalse::classof(value_sp.get())) {
// We have the value, and it is false.
value = false;
return true;
} else {
// We don't have a valid bool value for the given key.
return false;
}
}
bool JSONObject::GetObjectAsString(const std::string &key,
std::string &value) const {
auto value_sp = GetObject(key);
if (!value_sp) {
// The given key doesn't exist, so we have no value.
return false;
}
if (!JSONString::classof(value_sp.get()))
return false;
value = static_cast<JSONString *>(value_sp.get())->GetData();
return true;
}
JSONArray::JSONArray() : JSONValue(JSONValue::Kind::Array) {}
void JSONArray::Write(std::ostream &s) {
bool first = true;
s << '[';
auto iter = m_elements.begin(), end = m_elements.end();
for (; iter != end; iter++) {
if (first)
first = false;
else
s << ',';
(*iter)->Write(s);
}
s << ']';
}
bool JSONArray::SetObject(Index i, JSONValue::SP value) {
if (value.get() == nullptr)
return false;
if (i < m_elements.size()) {
m_elements[i] = value;
return true;
}
if (i == m_elements.size()) {
m_elements.push_back(value);
return true;
}
return false;
}
bool JSONArray::AppendObject(JSONValue::SP value) {
if (value.get() == nullptr)
return false;
m_elements.push_back(value);
return true;
}
JSONValue::SP JSONArray::GetObject(Index i) {
if (i < m_elements.size())
return m_elements[i];
return JSONValue::SP();
}
JSONArray::Size JSONArray::GetNumElements() { return m_elements.size(); }
JSONParser::JSONParser(const char *cstr) : StdStringExtractor(cstr) {}
JSONParser::Token JSONParser::GetToken(std::string &value) {
std::ostringstream error;
value.clear();
SkipSpaces();
const uint64_t start_index = m_index;
const char ch = GetChar();
switch (ch) {
case '{':
return Token::ObjectStart;
case '}':
return Token::ObjectEnd;
case '[':
return Token::ArrayStart;
case ']':
return Token::ArrayEnd;
case ',':
return Token::Comma;
case ':':
return Token::Colon;
case '\0':
return Token::EndOfFile;
case 't':
if (GetChar() == 'r')
if (GetChar() == 'u')
if (GetChar() == 'e')
return Token::True;
break;
case 'f':
if (GetChar() == 'a')
if (GetChar() == 'l')
if (GetChar() == 's')
if (GetChar() == 'e')
return Token::False;
break;
case 'n':
if (GetChar() == 'u')
if (GetChar() == 'l')
if (GetChar() == 'l')
return Token::Null;
break;
case '"': {
while (1) {
bool was_escaped = false;
int escaped_ch = GetEscapedChar(was_escaped);
if (escaped_ch == -1) {
error << "error: an error occurred getting a character from offset "
<< start_index;
value = error.str();
return Token::Status;
} else {
const bool is_end_quote = escaped_ch == '"';
const bool is_null = escaped_ch == 0;
if (was_escaped || (!is_end_quote && !is_null)) {
if (CHAR_MIN <= escaped_ch && escaped_ch <= CHAR_MAX) {
value.append(1, (char)escaped_ch);
} else {
error << "error: wide character support is needed for unicode "
"character 0x"
<< std::setprecision(4) << std::hex << escaped_ch;
error << " at offset " << start_index;
value = error.str();
return Token::Status;
}
} else if (is_end_quote) {
return Token::String;
} else if (is_null) {
value = "error: missing end quote for string";
return Token::Status;
}
}
}
} break;
case '-':
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9': {
bool done = false;
bool got_decimal_point = false;
uint64_t exp_index = 0;
bool got_int_digits = (ch >= '0') && (ch <= '9');
bool got_frac_digits = false;
bool got_exp_digits = false;
while (!done) {
const char next_ch = PeekChar();
switch (next_ch) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
if (exp_index != 0) {
got_exp_digits = true;
} else if (got_decimal_point) {
got_frac_digits = true;
} else {
got_int_digits = true;
}
++m_index; // Skip this character
break;
case '.':
if (got_decimal_point) {
error << "error: extra decimal point found at offset " << start_index;
value = error.str();
return Token::Status;
} else {
got_decimal_point = true;
++m_index; // Skip this character
}
break;
case 'e':
case 'E':
if (exp_index != 0) {
error << "error: extra exponent character found at offset "
<< start_index;
value = error.str();
return Token::Status;
} else {
exp_index = m_index;
++m_index; // Skip this character
}
break;
case '+':
case '-':
// The '+' and '-' can only come after an exponent character...
if (exp_index == m_index - 1) {
++m_index; // Skip the exponent sign character
} else {
error << "error: unexpected " << next_ch << " character at offset "
<< start_index;
value = error.str();
return Token::Status;
}
break;
default:
done = true;
break;
}
}
if (m_index > start_index) {
value = m_packet.substr(start_index, m_index - start_index);
if (got_decimal_point) {
if (exp_index != 0) {
// We have an exponent, make sure we got exponent digits
if (got_exp_digits) {
return Token::Float;
} else {
error << "error: got exponent character but no exponent digits at "
"offset in float value \""
<< value.c_str() << "\"";
value = error.str();
return Token::Status;
}
} else {
// No exponent, but we need at least one decimal after the decimal
// point
if (got_frac_digits) {
return Token::Float;
} else {
error << "error: no digits after decimal point \"" << value.c_str()
<< "\"";
value = error.str();
return Token::Status;
}
}
} else {
// No decimal point
if (got_int_digits) {
// We need at least some integer digits to make an integer
return Token::Integer;
} else {
error << "error: no digits negate sign \"" << value.c_str() << "\"";
value = error.str();
return Token::Status;
}
}
} else {
error << "error: invalid number found at offset " << start_index;
value = error.str();
return Token::Status;
}
} break;
default:
break;
}
error << "error: failed to parse token at offset " << start_index
<< " (around character '" << ch << "')";
value = error.str();
return Token::Status;
}
int JSONParser::GetEscapedChar(bool &was_escaped) {
was_escaped = false;
const char ch = GetChar();
if (ch == '\\') {
was_escaped = true;
const char ch2 = GetChar();
switch (ch2) {
case '"':
case '\\':
case '/':
default:
break;
case 'b':
return '\b';
case 'f':
return '\f';
case 'n':
return '\n';
case 'r':
return '\r';
case 't':
return '\t';
case 'u': {
const int hi_byte = DecodeHexU8();
const int lo_byte = DecodeHexU8();
if (hi_byte >= 0 && lo_byte >= 0)
return hi_byte << 8 | lo_byte;
return -1;
} break;
}
return ch2;
}
return ch;
}
JSONValue::SP JSONParser::ParseJSONObject() {
// The "JSONParser::Token::ObjectStart" token should have already been
// consumed
// by the time this function is called
std::unique_ptr<JSONObject> dict_up(new JSONObject());
std::string value;
std::string key;
while (1) {
JSONParser::Token token = GetToken(value);
if (token == JSONParser::Token::String) {
key.swap(value);
token = GetToken(value);
if (token == JSONParser::Token::Colon) {
JSONValue::SP value_sp = ParseJSONValue();
if (value_sp)
dict_up->SetObject(key, value_sp);
else
break;
}
} else if (token == JSONParser::Token::ObjectEnd) {
return JSONValue::SP(dict_up.release());
} else if (token == JSONParser::Token::Comma) {
continue;
} else {
break;
}
}
return JSONValue::SP();
}
JSONValue::SP JSONParser::ParseJSONArray() {
// The "JSONParser::Token::ObjectStart" token should have already been
// consumed
// by the time this function is called
std::unique_ptr<JSONArray> array_up(new JSONArray());
std::string value;
std::string key;
while (1) {
JSONValue::SP value_sp = ParseJSONValue();
if (value_sp)
array_up->AppendObject(value_sp);
else
break;
JSONParser::Token token = GetToken(value);
if (token == JSONParser::Token::Comma) {
continue;
} else if (token == JSONParser::Token::ArrayEnd) {
return JSONValue::SP(array_up.release());
} else {
break;
}
}
return JSONValue::SP();
}
JSONValue::SP JSONParser::ParseJSONValue() {
std::string value;
const JSONParser::Token token = GetToken(value);
switch (token) {
case JSONParser::Token::ObjectStart:
return ParseJSONObject();
case JSONParser::Token::ArrayStart:
return ParseJSONArray();
case JSONParser::Token::Integer: {
if (value.front() == '-') {
bool success = false;
int64_t sval = StringConvert::ToSInt64(value.c_str(), 0, 0, &success);
if (success)
return JSONValue::SP(new JSONNumber(sval));
} else {
bool success = false;
uint64_t uval = StringConvert::ToUInt64(value.c_str(), 0, 0, &success);
if (success)
return JSONValue::SP(new JSONNumber(uval));
}
} break;
case JSONParser::Token::Float: {
bool success = false;
double val = StringConvert::ToDouble(value.c_str(), 0.0, &success);
if (success)
return JSONValue::SP(new JSONNumber(val));
} break;
case JSONParser::Token::String:
return JSONValue::SP(new JSONString(value));
case JSONParser::Token::True:
return JSONValue::SP(new JSONTrue());
case JSONParser::Token::False:
return JSONValue::SP(new JSONFalse());
case JSONParser::Token::Null:
return JSONValue::SP(new JSONNull());
default:
break;
}
return JSONValue::SP();
}
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