/*
 * testparser.cc
 *  by CMB  9/04
 *    Test driver for parser.
 *
 *    Parses the file given on the command line.
 *    If it succeeds prints out the resulting AST.
 *    If we have parse errors, prints a message and does not
 *      print the tree.
 *
 */

#include "ast.h"

extern int yyparse();

// when it reduces to the start symbol, yyparse puts the root of the tree 
// in this variable
extern Program *ast;


// linenum and stringtab were defined in testlexer.cc, so they need
// to be defined here instead
int linenum = 1;


#include <stdio.h>
extern FILE *yyin;


// defined in espresso.y
extern void initParser();

// defined below
void processCmdLine(int argc, char *argv[]);



int main(int argc, char* argv[]) {

  processCmdLine(argc, argv);

  initParser();

  int status = yyparse();

  if (status == 0) {  // parse was successful
    ast->dump(cout, 0);
  }
  else {
    cerr << "Compilation halted due to lex and parse errors" << endl;
  }
  

}


// NOTE: yyin is the file variable defined by and used by flex
void processCmdLine(int argc, char *argv[])
{
  if (argc < 2) {
    cerr << "Error: Missing file to process.  Run program as follows:" << endl;
    cerr << "testparser <filename>" << endl;
    exit(1);
  }
  else {
    yyin = fopen(argv[1], "r");
    if (yyin == NULL) {
      cerr << "Error: Could not open input file " << argv[1] << endl;
      exit(1);
    }
  }
}