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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file LICENSE.rst or https://cmake.org/licensing for details. */
#include "cmJSONState.h"
#include <iterator>
#include <memory>
#include <sstream>
#include <cm3p/json/reader.h>
#include <cm3p/json/value.h>
#include <cm3p/json/version.h>
#include "cmsys/FStream.hxx"
#include "cmStringAlgorithms.h"
#include "cmSystemTools.h"
cmJSONState::cmJSONState(std::string jsonFile, Json::Value* root)
: Filename(std::move(jsonFile))
{
cmsys::ifstream fin(this->Filename.c_str(), std::ios::in | std::ios::binary);
if (!fin) {
this->AddError(cmStrCat("File not found: ", this->Filename));
return;
}
// If there's a BOM, toss it.
cmsys::FStream::ReadBOM(fin);
// Save the entire document.
std::streampos finBegin = fin.tellg();
this->doc = std::string(std::istreambuf_iterator<char>(fin),
std::istreambuf_iterator<char>());
if (this->doc.empty()) {
this->AddError("A JSON document cannot be empty");
return;
}
fin.seekg(finBegin);
Json::CharReaderBuilder builder;
Json::CharReaderBuilder::strictMode(&builder.settings_);
std::string errMsg;
#if JSONCPP_VERSION_HEXA >= 0x01090600
// Has StructuredError
std::unique_ptr<Json::CharReader> const reader(builder.newCharReader());
reader->parse(doc.data(), doc.data() + doc.size(), root, &errMsg);
std::vector<Json::CharReader::StructuredError> structuredErrors =
reader->getStructuredErrors();
for (auto const& structuredError : structuredErrors) {
this->AddErrorAtOffset(structuredError.message,
structuredError.offset_start);
}
#else
// No StructuredError Available, Use error string from jsonCpp
if (!Json::parseFromStream(builder, fin, root, &errMsg)) {
errMsg = cmStrCat("JSON Parse Error: ", this->Filename, ":\n", errMsg);
this->AddError(errMsg);
}
#endif
}
void cmJSONState::AddError(std::string const& errMsg)
{
this->errors.emplace_back(errMsg);
}
void cmJSONState::AddErrorAtValue(std::string const& errMsg,
Json::Value const* value)
{
if (value && !value->isNull()) {
this->AddErrorAtOffset(errMsg, value->getOffsetStart());
} else {
this->AddError(errMsg);
}
}
void cmJSONState::AddErrorAtOffset(std::string const& errMsg,
std::ptrdiff_t offset)
{
if (doc.empty()) {
this->AddError(errMsg);
} else {
Location loc = LocateInDocument(offset);
this->errors.emplace_back(loc, errMsg);
}
}
std::string cmJSONState::GetErrorMessage(bool showContext)
{
std::string message;
std::string filenameName = cmSystemTools::GetFilenameName(this->Filename);
for (auto const& error : this->errors) {
Location loc = error.GetLocation();
if (!filenameName.empty() && loc.line > 0) {
message = cmStrCat(message, filenameName, ':', loc.line, ": ");
}
message = cmStrCat(message, error.GetErrorMessage(), '\n');
if (showContext && loc.line > 0) {
message = cmStrCat(message, GetJsonContext(loc), '\n');
}
}
message.pop_back();
return message;
}
std::string cmJSONState::key()
{
if (!this->parseStack.empty()) {
return this->parseStack.back().first;
}
return "";
}
std::string cmJSONState::key_after(std::string const& k)
{
for (auto it = this->parseStack.begin(); it != this->parseStack.end();
++it) {
if (it->first == k && (++it) != this->parseStack.end()) {
return it->first;
}
}
return "";
}
Json::Value const* cmJSONState::value_after(std::string const& k)
{
for (auto it = this->parseStack.begin(); it != this->parseStack.end();
++it) {
if (it->first == k && (++it) != this->parseStack.end()) {
return it->second;
}
}
return nullptr;
}
void cmJSONState::push_stack(std::string const& k, Json::Value const* value)
{
this->parseStack.emplace_back(k, value);
}
void cmJSONState::pop_stack()
{
this->parseStack.pop_back();
}
std::string cmJSONState::GetJsonContext(Location loc)
{
std::string line;
std::stringstream sstream(doc);
for (int i = 0; i < loc.line; ++i) {
std::getline(sstream, line, '\n');
}
return cmStrCat(line, '\n', std::string(loc.column - 1, ' '), '^');
}
cmJSONState::Location cmJSONState::LocateInDocument(ptrdiff_t offset)
{
int line = 1;
int col = 1;
char const* beginDoc = doc.data();
char const* last = beginDoc + offset;
for (; beginDoc != last; ++beginDoc) {
switch (*beginDoc) {
case '\r':
if (beginDoc + 1 != last && beginDoc[1] == '\n') {
continue; // consume CRLF as a single token.
}
CM_FALLTHROUGH; // CR without a following LF is same as LF
case '\n':
col = 1;
++line;
break;
default:
++col;
break;
}
}
return { line, col };
}
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