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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-FileCopyrightText: Copyright 2008 Sandia Corporation
// SPDX-License-Identifier: LicenseRef-BSD-3-Clause-Sandia-USGov
#include "vtkISIReader.h"
#include "vtkCommand.h"
#include "vtkObjectFactory.h"
#include "vtkStringArray.h"
#include "vtkTable.h"
#include "vtkVariant.h"
#include "vtksys/FStream.hxx"
#include <map>
#include <string>
VTK_ABI_NAMESPACE_BEGIN
vtkStandardNewMacro(vtkISIReader);
// Not all platforms support std::getline(istream&, std::string) so
// we have to provide our own
static istream& my_getline(istream& input, std::string& output, char delimiter = '\n');
//------------------------------------------------------------------------------
vtkISIReader::vtkISIReader()
: FileName(nullptr)
, Delimiter(nullptr)
, MaxRecords(0)
{
this->SetDelimiter(";");
this->SetNumberOfInputPorts(0);
this->SetNumberOfOutputPorts(1);
}
//------------------------------------------------------------------------------
vtkISIReader::~vtkISIReader()
{
this->SetDelimiter(nullptr);
this->SetFileName(nullptr);
}
//------------------------------------------------------------------------------
void vtkISIReader::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
os << indent << "FileName: " << (this->FileName ? this->FileName : "(none)") << endl;
os << indent << "Delimiter: " << (this->Delimiter ? this->Delimiter : "(none)") << endl;
os << indent << "MaxRecords: " << this->MaxRecords << endl;
}
//------------------------------------------------------------------------------
int vtkISIReader::RequestData(
vtkInformation*, vtkInformationVector**, vtkInformationVector* outputVector)
{
// Check that the filename has been specified
if (!this->FileName)
{
vtkErrorMacro("vtkISIReader: You must specify a filename!");
return 0;
}
// Open the file
vtksys::ifstream file(this->FileName, ios::in | ios::binary);
if (!file)
{
vtkErrorMacro(<< "vtkISIReader could not open file " << this->FileName);
return 0;
}
// Get the total size of the file ...
file.seekg(0, ios::end);
const int total_bytes = file.tellg();
// Go back to the top of the file
file.seekg(0, ios::beg);
// Store the text data into a vtkTable
vtkTable* table = vtkTable::GetData(outputVector);
// Keep a mapping of column-name to column-index for quick lookups ...
std::map<std::string, vtkIdType> columns;
// Get header information from the first two lines of the file ...
std::string line_buffer;
my_getline(file, line_buffer);
if (line_buffer != "FN ISI Export Format")
{
vtkErrorMacro(<< "File " << this->FileName << " is not an ISI file");
return 0;
}
my_getline(file, line_buffer);
if (line_buffer != "VR 1.0")
{
vtkErrorMacro(<< "File " << this->FileName << " is not an ISI version 1.0 file");
return 0;
}
const std::string delimiter(this->Delimiter ? this->Delimiter : "");
int record_count = 0;
// For each record in the file ...
for (my_getline(file, line_buffer); file; my_getline(file, line_buffer))
{
// Stop if we exceed the maximum number of records ...
if (this->MaxRecords && record_count >= this->MaxRecords)
break;
double progress =
total_bytes ? static_cast<double>(file.tellg()) / static_cast<double>(total_bytes) : 0.5;
this->InvokeEvent(vtkCommand::ProgressEvent, &progress);
// Add a new row to the table for the record ...
table->InsertNextBlankRow();
// For each field in the record ...
for (; file;)
{
const std::string tag_type =
line_buffer.size() >= 2 ? line_buffer.substr(0, 2) : std::string();
if (tag_type == "ER")
break;
if (tag_type == "EF")
break;
std::string tag_value = line_buffer.size() > 3 ? line_buffer.substr(3) : std::string();
// For each line in the field ...
for (my_getline(file, line_buffer); file; my_getline(file, line_buffer))
{
const std::string next_tag_type =
line_buffer.size() >= 2 ? line_buffer.substr(0, 2) : std::string();
if (next_tag_type != " ")
break;
const std::string next_tag_value =
line_buffer.size() > 3 ? line_buffer.substr(3) : std::string();
tag_value += delimiter + next_tag_value;
}
// If necessary, add a new column to the table to store this value ...
if (!columns.count(tag_type))
{
vtkStringArray* const new_column = vtkStringArray::New();
new_column->SetName(tag_type.c_str());
new_column->SetNumberOfTuples(record_count + 1);
columns[tag_type] = table->GetNumberOfColumns();
table->AddColumn(new_column);
new_column->Delete();
}
// Set the table value ...
table->SetValue(record_count, columns[tag_type], tag_value.c_str());
}
// Keep track of the current record count ...
++record_count;
}
return 1;
}
//------------------------------------------------------------------------------
static istream& my_getline(istream& input, std::string& output, char delimiter)
{
output = "";
unsigned int numCharactersRead = 0;
int nextValue = 0;
while ((nextValue = input.get()) != EOF && numCharactersRead < output.max_size())
{
++numCharactersRead;
char downcast = static_cast<char>(nextValue);
if (downcast == delimiter || (delimiter == '\n' && downcast == '\r'))
{
if (delimiter == '\n' && downcast == '\r' && input.peek() == '\n')
{
input.get();
}
return input;
}
else
{
output += downcast;
}
}
return input;
}
VTK_ABI_NAMESPACE_END
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