CMake/Source/cmExprParserHelper.cxx

/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
   file Copyright.txt or https://cmake.org/licensing for details.  */
#include "cmExprParserHelper.h"

#include "cmExprLexer.h"

#include <iostream>
#include <sstream>

int cmExpr_yyparse(yyscan_t yyscanner);
//
cmExprParserHelper::cmExprParserHelper()
{
  this->FileLine = -1;
  this->FileName = nullptr;
}

cmExprParserHelper::~cmExprParserHelper()
{
  this->CleanupParser();
}

int cmExprParserHelper::ParseString(const char* str, int verb)
{
  if (!str) {
    return 0;
  }
  // printf("Do some parsing: %s\n", str);

  this->Verbose = verb;
  this->InputBuffer = str;
  this->InputBufferPos = 0;
  this->CurrentLine = 0;

  this->Result = 0;

  yyscan_t yyscanner;
  cmExpr_yylex_init(&yyscanner);
  cmExpr_yyset_extra(this, yyscanner);
  int res = cmExpr_yyparse(yyscanner);
  cmExpr_yylex_destroy(yyscanner);
  if (res != 0) {
    // str << "CAL_Parser returned: " << res << std::endl;
    // std::cerr << "When parsing: [" << str << "]" << std::endl;
    return 0;
  }

  this->CleanupParser();

  if (Verbose) {
    std::cerr << "Expanding [" << str << "] produced: [" << this->Result << "]"
              << std::endl;
  }
  return 1;
}

void cmExprParserHelper::CleanupParser()
{
}

int cmExprParserHelper::LexInput(char* buf, int maxlen)
{
  // std::cout << "JPLexInput ";
  // std::cout.write(buf, maxlen);
  // std::cout << std::endl;
  if (maxlen < 1) {
    return 0;
  }
  if (this->InputBufferPos < this->InputBuffer.size()) {
    buf[0] = this->InputBuffer[this->InputBufferPos++];
    if (buf[0] == '\n') {
      this->CurrentLine++;
    }
    return (1);
  }
  buf[0] = '\n';
  return (0);
}

void cmExprParserHelper::Error(const char* str)
{
  unsigned long pos = static_cast<unsigned long>(this->InputBufferPos);
  std::ostringstream ostr;
  ostr << str << " (" << pos << ")";
  this->ErrorString = ostr.str();
}

void cmExprParserHelper::SetResult(int value)
{
  this->Result = value;
}