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Make the "lldb/Utility/JSON.h" able to parse JSON into tokens with the new JSONParser class. 

Change over existing code to use this new parser so StructuredData can use the tokenizer to parse JSON instead of doing it manually.

This allowed us to easily parse JSON into JSON* objects as well as into StructuredData.

llvm-svn: 241522
This commit is contained in:
Greg Clayton 2015-07-06 23:40:40 +00:00
parent 8ee6a30b8d
commit 98424c4460
7 changed files with 722 additions and 338 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
lldb/include/lldb/Host/StringConvert.h
View File

@ -39,6 +39,8 @@ ToSInt64 (const char *s, int64_t fail_value = 0, int base = 0, bool *success_ptr
uint64_t
ToUInt64 (const char *s, uint64_t fail_value = 0, int base = 0, bool *success_ptr = nullptr);
double
ToDouble (const char *s, double fail_value = 0.0, bool *success_ptr = nullptr);
} // namespace StringConvert
} // namespace lldb_private

68
lldb/include/lldb/Utility/JSON.h
View File

@ -11,6 +11,7 @@
#define utility_JSON_h_
#include "lldb/Core/Stream.h"
#include "Utility/StringExtractor.h"
#include <inttypes.h>
#include <map>
@ -22,6 +23,7 @@
#include "llvm/Support/Casting.h"
namespace lldb_private {
class JSONValue
{
public:
@ -97,8 +99,9 @@ namespace lldb_private {
{
public:
JSONNumber ();
JSONNumber (int64_t i);
explicit JSONNumber (uint64_t i);
explicit JSONNumber (double d);
JSONNumber (const JSONNumber& s) = delete;
JSONNumber&
operator = (const JSONNumber& s) = delete;
@ -107,10 +110,19 @@ namespace lldb_private {
Write (Stream& s);
typedef std::shared_ptr<JSONNumber> SP;
int64_t
uint64_t
GetData () { return m_data; }
double
GetAsDouble()
{
if (m_is_integer)
return (double)m_data;
else
return m_double;
}
static bool classof(const JSONValue *V)
{
return V->GetKind() == JSONValue::Kind::Number;
@ -120,7 +132,9 @@ namespace lldb_private {
~JSONNumber () = default;
private:
int64_t m_data;
bool m_is_integer;
uint64_t m_data;
double m_double;
};
class JSONTrue : public JSONValue
@ -271,6 +285,48 @@ namespace lldb_private {
Vector m_elements;
};
class JSONParser : public StringExtractor
{
public:
enum Token
{
Invalid,
Error,
ObjectStart,
ObjectEnd,
ArrayStart,
ArrayEnd,
Comma,
Colon,
String,
Integer,
Float,
True,
False,
Null,
EndOfFile
};
JSONParser (const char *cstr);
int
GetEscapedChar (bool &was_escaped);
Token
GetToken (std::string &value);
JSONValue::SP
ParseJSONValue ();
protected:
JSONValue::SP
ParseJSONObject ();
JSONValue::SP
ParseJSONArray ();
};
}
#endif // utility_ProcessStructReader_h_

359
lldb/source/Core/StructuredData.cpp
View File

@ -14,301 +14,148 @@
#include <inttypes.h>
#include "lldb/Core/StreamString.h"
#include "lldb/Host/StringConvert.h"
#include "lldb/Utility/JSON.h"
using namespace lldb_private;
static StructuredData::ObjectSP read_json_object (const char **ch);
static StructuredData::ObjectSP read_json_array (const char **ch);
//----------------------------------------------------------------------
// Functions that use a JSONParser to parse JSON into StructuredData
//----------------------------------------------------------------------
static StructuredData::ObjectSP ParseJSONValue (JSONParser &json_parser);
static StructuredData::ObjectSP ParseJSONObject (JSONParser &json_parser);
static StructuredData::ObjectSP ParseJSONArray (JSONParser &json_parser);
static StructuredData::ObjectSP
read_json_number (const char **ch)
ParseJSONObject (JSONParser &json_parser)
{
StructuredData::ObjectSP object_sp;
while (isspace (**ch))
(*ch)++;
const char *start_of_number = *ch;
bool is_integer = true;
bool is_float = false;
while (isdigit(**ch) || **ch == '-' || **ch == '.' || **ch == '+' || **ch == 'e' || **ch == 'E')
{
if (isdigit(**ch) == false && **ch != '-')
{
is_integer = false;
is_float = true;
}
(*ch)++;
}
while (isspace (**ch))
(*ch)++;
if (**ch == ',' || **ch == ']' || **ch == '}')
{
if (is_integer)
{
errno = 0;
uint64_t val = strtoul (start_of_number, NULL, 10);
if (errno == 0)
{
object_sp.reset(new StructuredData::Integer());
object_sp->GetAsInteger()->SetValue (val);
}
}
if (is_float)
{
char *end_of_number = NULL;
errno = 0;
double val = strtod (start_of_number, &end_of_number);
if (errno == 0 && end_of_number != start_of_number && end_of_number != NULL)
{
object_sp.reset(new StructuredData::Float());
object_sp->GetAsFloat()->SetValue (val);
}
}
}
return object_sp;
}
// The "JSONParser::Token::ObjectStart" token should have already been consumed
// by the time this function is called
std::unique_ptr<StructuredData::Dictionary> dict_up(new StructuredData::Dictionary());
static std::string
read_json_string (const char **ch)
{
std::string string;
if (**ch == '"')
std::string value;
std::string key;
while (1)
{
(*ch)++;
while (**ch != '\0')
{
if (**ch == '"')
{
(*ch)++;
while (isspace (**ch))
(*ch)++;
break;
}
else if (**ch == '\\')
{
switch (**ch)
{
case '"':
string.push_back('"');
*ch += 2;
break;
case '\\':
string.push_back('\\');
*ch += 2;
break;
case '/':
string.push_back('/');
*ch += 2;
break;
case 'b':
string.push_back('\b');
*ch += 2;
break;
case 'f':
string.push_back('\f');
*ch += 2;
break;
case 'n':
string.push_back('\n');
*ch += 2;
break;
case 'r':
string.push_back('\r');
*ch += 2;
break;
case 't':
string.push_back('\t');
*ch += 2;
break;
case 'u':
// FIXME handle four-hex-digits
*ch += 10;
break;
default:
*ch += 1;
}
}
else
{
string.push_back (**ch);
}
(*ch)++;
}
}
return string;
}
JSONParser::Token token = json_parser.GetToken(value);
static StructuredData::ObjectSP
read_json_value (const char **ch)
{
StructuredData::ObjectSP object_sp;
while (isspace (**ch))
(*ch)++;
if (**ch == '{')
{
object_sp = read_json_object (ch);
}
else if (**ch == '[')
{
object_sp = read_json_array (ch);
}
else if (**ch == '"')
{
std::string string = read_json_string (ch);
object_sp.reset(new StructuredData::String());
object_sp->GetAsString()->SetValue(string);
}
else
{
if (strncmp (*ch, "true", 4) == 0)
if (token == JSONParser::Token::String)
{
object_sp.reset(new StructuredData::Boolean());
object_sp->GetAsBoolean()->SetValue(true);
*ch += 4;
key.swap(value);
token = json_parser.GetToken(value);
if (token == JSONParser::Token::Colon)
{
StructuredData::ObjectSP value_sp = ParseJSONValue(json_parser);
if (value_sp)
dict_up->AddItem(key, value_sp);
else
break;
}
}
else if (strncmp (*ch, "false", 5) == 0)
else if (token == JSONParser::Token::ObjectEnd)
{
object_sp.reset(new StructuredData::Boolean());
object_sp->GetAsBoolean()->SetValue(false);
*ch += 5;
return StructuredData::ObjectSP(dict_up.release());
}
else if (strncmp (*ch, "null", 4) == 0)
else if (token == JSONParser::Token::Comma)
{
object_sp.reset(new StructuredData::Null());
*ch += 4;
continue;
}
else
{
object_sp = read_json_number (ch);
break;
}
}
return object_sp;
return StructuredData::ObjectSP();
}
static StructuredData::ObjectSP
read_json_array (const char **ch)
ParseJSONArray (JSONParser &json_parser)
{
StructuredData::ObjectSP object_sp;
if (**ch == '[')
{
(*ch)++;
while (isspace (**ch))
(*ch)++;
// The "JSONParser::Token::ObjectStart" token should have already been consumed
// by the time this function is called
std::unique_ptr<StructuredData::Array> array_up(new StructuredData::Array());
bool first_value = true;
while (**ch != '\0' && (first_value || **ch == ','))
std::string value;
std::string key;
while (1)
{
StructuredData::ObjectSP value_sp = ParseJSONValue(json_parser);
if (value_sp)
array_up->AddItem(value_sp);
else
break;
JSONParser::Token token = json_parser.GetToken(value);
if (token == JSONParser::Token::Comma)
{
if (**ch == ',')
(*ch)++;
first_value = false;
while (isspace (**ch))
(*ch)++;
lldb_private::StructuredData::ObjectSP value_sp = read_json_value (ch);
if (value_sp)
{
if (object_sp.get() == NULL)
{
object_sp.reset(new StructuredData::Array());
}
object_sp->GetAsArray()->Push (value_sp);
}
while (isspace (**ch))
(*ch)++;
continue;
}
if (**ch == ']')
else if (token == JSONParser::Token::ArrayEnd)
{
// FIXME should throw an error if we don't see a } to close out the JSON object
(*ch)++;
while (isspace (**ch))
(*ch)++;
return StructuredData::ObjectSP(array_up.release());
}
else
{
break;
}
}
return object_sp;
return StructuredData::ObjectSP();
}
static StructuredData::ObjectSP
read_json_object (const char **ch)
ParseJSONValue (JSONParser &json_parser)
{
StructuredData::ObjectSP object_sp;
if (**ch == '{')
std::string value;
const JSONParser::Token token = json_parser.GetToken(value);
switch (token)
{
(*ch)++;
while (isspace (**ch))
(*ch)++;
bool first_pair = true;
while (**ch != '\0' && (first_pair || **ch == ','))
{
first_pair = false;
if (**ch == ',')
(*ch)++;
while (isspace (**ch))
(*ch)++;
if (**ch != '"')
break;
std::string key_string = read_json_string (ch);
while (isspace (**ch))
(*ch)++;
if (key_string.size() > 0 && **ch == ':')
{
(*ch)++;
while (isspace (**ch))
(*ch)++;
lldb_private::StructuredData::ObjectSP value_sp = read_json_value (ch);
if (value_sp.get())
{
if (object_sp.get() == NULL)
{
object_sp.reset(new StructuredData::Dictionary());
}
object_sp->GetAsDictionary()->AddItem (key_string.c_str(), value_sp);
}
}
while (isspace (**ch))
(*ch)++;
}
if (**ch == '}')
{
// FIXME should throw an error if we don't see a } to close out the JSON object
(*ch)++;
while (isspace (**ch))
(*ch)++;
}
}
return object_sp;
}
case JSONParser::Token::ObjectStart:
return ParseJSONObject(json_parser);
case JSONParser::Token::ArrayStart:
return ParseJSONArray(json_parser);
case JSONParser::Token::Integer:
{
bool success = false;
uint64_t uval = StringConvert::ToUInt64(value.c_str(), 0, 0, &success);
if (success)
return StructuredData::ObjectSP(new StructuredData::Integer(uval));
}
break;
case JSONParser::Token::Float:
{
bool success = false;
double val = StringConvert::ToDouble(value.c_str(), 0.0, &success);
if (success)
return StructuredData::ObjectSP(new StructuredData::Float(val));
}
break;
case JSONParser::Token::String:
return StructuredData::ObjectSP(new StructuredData::String(value));
case JSONParser::Token::True:
case JSONParser::Token::False:
return StructuredData::ObjectSP(new StructuredData::Boolean(token == JSONParser::Token::True));
case JSONParser::Token::Null:
return StructuredData::ObjectSP(new StructuredData::Null());
default:
break;
}
return StructuredData::ObjectSP();
}
StructuredData::ObjectSP
StructuredData::ParseJSON (std::string json_text)
{
StructuredData::ObjectSP object_sp;
const size_t json_text_size = json_text.size();
if (json_text_size > 0)
{
const char *start_of_json_text = json_text.c_str();
const char *c = json_text.c_str();
while (*c != '\0' &&
static_cast<size_t>(c - start_of_json_text) <= json_text_size)
{
while (isspace (*c) &&
static_cast<size_t>(c - start_of_json_text) < json_text_size)
c++;
if (*c == '{')
{
object_sp = read_json_object (&c);
}
else if (*c == '[')
{
object_sp = read_json_array (&c);
}
else
{
// We have bad characters here, this is likely an illegal JSON string.
return object_sp;
}
}
}
JSONParser json_parser(json_text.c_str());
StructuredData::ObjectSP object_sp = ParseJSONValue(json_parser);
return object_sp;
}
@ -395,7 +242,7 @@ StructuredData::Integer::Dump (Stream &s) const
void
StructuredData::Float::Dump (Stream &s) const
{
s.Printf ("%lf", m_value);
s.Printf ("%lg", m_value);
}
void

142
lldb/source/Host/common/StringConvert.cpp
View File

@ -15,79 +15,103 @@
// Project includes
#include "lldb/Host/StringConvert.h"
namespace lldb_private {
namespace StringConvert {
int32_t
ToSInt32 (const char *s, int32_t fail_value, int base, bool *success_ptr)
namespace lldb_private
{
if (s && s[0])
namespace StringConvert
{
char *end = nullptr;
const long sval = ::strtol (s, &end, base);
if (*end == '\0')
int32_t
ToSInt32 (const char *s, int32_t fail_value, int base, bool *success_ptr)
{
if (s && s[0])
{
char *end = nullptr;
const long sval = ::strtol (s, &end, base);
if (*end == '\0')
{
if (success_ptr)
*success_ptr = ((sval <= INT32_MAX) && (sval >= INT32_MIN));
return (int32_t)sval; // All characters were used, return the result
}
}
if (success_ptr)
*success_ptr = ((sval <= INT32_MAX) && (sval >= INT32_MIN));
return (int32_t)sval; // All characters were used, return the result
*success_ptr = false;
return fail_value;
}
}
if (success_ptr) *success_ptr = false;
return fail_value;
}
uint32_t
ToUInt32 (const char *s, uint32_t fail_value, int base, bool *success_ptr)
{
if (s && s[0])
{
char *end = nullptr;
const unsigned long uval = ::strtoul (s, &end, base);
if (*end == '\0')
uint32_t
ToUInt32 (const char *s, uint32_t fail_value, int base, bool *success_ptr)
{
if (s && s[0])
{
char *end = nullptr;
const unsigned long uval = ::strtoul (s, &end, base);
if (*end == '\0')
{
if (success_ptr)
*success_ptr = (uval <= UINT32_MAX);
return (uint32_t)uval; // All characters were used, return the result
}
}
if (success_ptr)
*success_ptr = (uval <= UINT32_MAX);
return (uint32_t)uval; // All characters were used, return the result
*success_ptr = false;
return fail_value;
}
}
if (success_ptr) *success_ptr = false;
return fail_value;
}
int64_t
ToSInt64 (const char *s, int64_t fail_value, int base, bool *success_ptr)
{
if (s && s[0])
{
char *end = nullptr;
int64_t uval = ::strtoll (s, &end, base);
if (*end == '\0')
int64_t
ToSInt64 (const char *s, int64_t fail_value, int base, bool *success_ptr)
{
if (success_ptr) *success_ptr = true;
return uval; // All characters were used, return the result
if (s && s[0])
{
char *end = nullptr;
int64_t uval = ::strtoll (s, &end, base);
if (*end == '\0')
{
if (success_ptr)
*success_ptr = true;
return uval; // All characters were used, return the result
}
}
if (success_ptr)
*success_ptr = false;
return fail_value;
}
}
if (success_ptr) *success_ptr = false;
return fail_value;
}
uint64_t
ToUInt64 (const char *s, uint64_t fail_value, int base, bool *success_ptr)
{
if (s && s[0])
{
char *end = nullptr;
uint64_t uval = ::strtoull (s, &end, base);
if (*end == '\0')
uint64_t
ToUInt64 (const char *s, uint64_t fail_value, int base, bool *success_ptr)
{
if (success_ptr) *success_ptr = true;
return uval; // All characters were used, return the result
if (s && s[0])
{
char *end = nullptr;
uint64_t uval = ::strtoull (s, &end, base);
if (*end == '\0')
{
if (success_ptr)
*success_ptr = true;
return uval; // All characters were used, return the result
}
}
if (success_ptr) *success_ptr = false;
return fail_value;
}
double
ToDouble (const char *s, double fail_value, bool *success_ptr)
{
if (s && s[0])
{
char *end = nullptr;
double val = strtod (s, &end);
if (*end == '\0')
{
if (success_ptr)
*success_ptr = true;
return val; // All characters were used, return the result
}
}
if (success_ptr)
*success_ptr = false;
return fail_value;
}
}
if (success_ptr) *success_ptr = false;
return fail_value;
}
}
}

468
lldb/source/Utility/JSON.cpp
View File

@ -8,6 +8,8 @@
//===----------------------------------------------------------------------===//
#include "lldb/Utility/JSON.h"
#include "lldb/Core/StreamString.h"
#include "lldb/Host/StringConvert.h"
using namespace lldb_private;
@ -33,20 +35,20 @@ JSONString::json_string_quote_metachars (const std::string &s)
}
JSONString::JSONString () :
JSONValue(JSONValue::Kind::String),
m_data()
JSONValue(JSONValue::Kind::String),
m_data()
{
}
JSONString::JSONString (const char* s) :
JSONValue(JSONValue::Kind::String),
m_data(s ? s : "")
JSONValue(JSONValue::Kind::String),
m_data(s ? s : "")
{
}
JSONString::JSONString (const std::string& s) :
JSONValue(JSONValue::Kind::String),
m_data(s)
JSONValue(JSONValue::Kind::String),
m_data(s)
{
}
@ -57,25 +59,41 @@ JSONString::Write (Stream& s)
}
JSONNumber::JSONNumber () :
JSONValue(JSONValue::Kind::Number),
m_data(0)
JSONValue(JSONValue::Kind::Number),
m_is_integer(true),
m_data(0),
m_double(0.0)
{
}
JSONNumber::JSONNumber (int64_t i) :
JSONValue(JSONValue::Kind::Number),
m_data(i)
JSONNumber::JSONNumber (uint64_t i) :
JSONValue(JSONValue::Kind::Number),
m_is_integer(true),
m_data(i),
m_double(0.0)
{
}
JSONNumber::JSONNumber (double d) :
JSONValue(JSONValue::Kind::Number),
m_is_integer(false),
m_data(0),
m_double(d)
{
}
void
JSONNumber::Write (Stream& s)
{
s.Printf("%" PRId64, m_data);
if (m_is_integer)
s.Printf("%" PRIu64, m_data);
else
s.Printf("%g", m_double);
}
JSONTrue::JSONTrue () :
JSONValue(JSONValue::Kind::True)
JSONValue(JSONValue::Kind::True)
{
}
@ -86,7 +104,7 @@ JSONTrue::Write(Stream& s)
}
JSONFalse::JSONFalse () :
JSONValue(JSONValue::Kind::False)
JSONValue(JSONValue::Kind::False)
{
}
@ -97,7 +115,7 @@ JSONFalse::Write(Stream& s)
}
JSONNull::JSONNull () :
JSONValue(JSONValue::Kind::Null)
JSONValue(JSONValue::Kind::Null)
{
}
@ -108,7 +126,7 @@ JSONNull::Write(Stream& s)
}
JSONObject::JSONObject () :
JSONValue(JSONValue::Kind::Object)
JSONValue(JSONValue::Kind::Object)
{
}
@ -153,7 +171,7 @@ JSONObject::GetObject (const std::string& key)
}
JSONArray::JSONArray () :
JSONValue(JSONValue::Kind::Array)
JSONValue(JSONValue::Kind::Array)
{
}
@ -215,3 +233,419 @@ JSONArray::GetNumElements ()
{
return m_elements.size();
}
JSONParser::JSONParser (const char *cstr) :
StringExtractor(cstr)
{
}
JSONParser::Token
JSONParser::GetToken (std::string &value)
{
StreamString 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.Printf("error: an error occurred getting a character from offset %" PRIu64, start_index);
value = std::move(error.GetString());
return Token::Error;
}
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.Printf("error: wide character support is needed for unicode character 0x%4.4x at offset %" PRIu64, escaped_ch, start_index);
value = std::move(error.GetString());
return Token::Error;
}
}
else if (is_end_quote)
{
return Token::String;
}
else if (is_null)
{
value = "error: missing end quote for string";
return Token::Error;
}
}
}
}
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.Printf("error: extra decimal point found at offset %" PRIu64, start_index);
value = std::move(error.GetString());
return Token::Error;
}
else
{
got_decimal_point = true;
++m_index; // Skip this character
}
break;
case 'e':
case 'E':
if (exp_index != 0)
{
error.Printf("error: extra expenent character found at offset %" PRIu64, start_index);
value = std::move(error.GetString());
return Token::Error;
}
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.Printf("error: unexpected %c character at offset %" PRIu64, next_ch, start_index);
value = std::move(error.GetString());
return Token::Error;
}
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.Printf("error: got exponent character but no exponent digits at offset in float value \"%s\"", value.c_str());
value = std::move(error.GetString());
return Token::Error;
}
}
else
{
// No exponent, but we need at least one decimal after the decimal point
if (got_frac_digits)
{
return Token::Float;
}
else
{
error.Printf("error: no digits after decimal point \"%s\"", value.c_str());
value = std::move(error.GetString());
return Token::Error;
}
}
}
else
{
// No decimal point
if (got_int_digits)
{
// We need at least some integer digits to make an integer
return Token::Integer;
}
else
{
error.Printf("error: no digits negate sign \"%s\"", value.c_str());
value = std::move(error.GetString());
return Token::Error;
}
}
}
else
{
error.Printf("error: invalid number found at offset %" PRIu64, start_index);
value = std::move(error.GetString());
return Token::Error;
}
}
break;
default:
break;
}
error.Printf("error: failed to parse token at offset %" PRIu64 " (around character '%c')", start_index, ch);
value = std::move(error.GetString());
return Token::Error;
}
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:
{
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();
}

9
lldb/source/Utility/StringExtractor.cpp
View File

@ -476,3 +476,12 @@ StringExtractor::GetNameColonValue (std::string &name, std::string &value)
m_index = UINT64_MAX;
return false;
}
void
StringExtractor::SkipSpaces ()
{
const size_t n = m_packet.size();
while (m_index < n && isspace(m_packet[m_index]))
++m_index;
}

12
lldb/source/Utility/StringExtractor.h
View File

@ -67,6 +67,9 @@ public:
m_index = 0;
}
void
SkipSpaces ();
std::string &
GetStringRef ()
{
@ -96,6 +99,15 @@ public:
char
GetChar (char fail_value = '\0');
char
PeekChar (char fail_value = '\0')
{
const char *cstr = Peek();
if (cstr)
return cstr[0];
return fail_value;
}
int
DecodeHexU8();