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colvarparse::read_block Class Reference

Helper class to read a block of the type "key { ... }" from a stream and store it in a string. More...

#include <colvarparse.h>

List of all members.

Public Member Functions

 read_block (std::string const &key_in, std::string &data_in)
 ~read_block ()

Friends

std::istream & operator>> (std::istream &is, read_block const &rb)

Detailed Description

Helper class to read a block of the type "key { ... }" from a stream and store it in a string.

Useful on restarts, where the file is too big to be loaded in a string by key_lookup; it can only check that the keyword is correct and the block is properly delimited by braces, not skipping other blocks

Definition at line 148 of file colvarparse.h.

Constructor & Destructor Documentation

colvarparse::read_block::read_block (  std::string const &  key_in,
std::string &  data_in
)  [inline]
 

Definition at line 154 of file colvarparse.h.

00155       : key (key_in), data (&data_in)
00156     {}

colvarparse::read_block::~read_block (   )  [inline]
 

Definition at line 157 of file colvarparse.h.

00157 {}

Friends And Related Function Documentation

std::istream& operator>> (  std::istream &  is,
colvarparse::read_block const &  rb
)  [friend]
 

Definition at line 573 of file colvarparse.C.

00574 {
00575   size_t start_pos = is.tellg();
00576   std::string read_key, next;
00577 
00578   if ( !(is >> read_key) || !(read_key == rb.key) ||
00579        !(is >> next) ) {
00580     // the requested keyword has not been found, or it is not possible
00581     // to read data after it
00582     is.clear();
00583     is.seekg (start_pos, std::ios::beg);
00584     is.setstate (std::ios::failbit);
00585     return is;
00586   }
00587 
00588   if (next != "{") {
00589     (*rb.data) = next;
00590     return is;
00591   }
00592 
00593   size_t brace_count = 1;
00594   std::string line;
00595   while (colvarparse::getline_nocomments (is, line)) {
00596     size_t br = 0, br_old;
00597     while ( (br = line.find_first_of ("{}", br)) != std::string::npos) {
00598       if (line[br] == '{') brace_count++;
00599       if (line[br] == '}') brace_count--;
00600       br_old = br;
00601       br++;
00602     }
00603     if (brace_count) (*rb.data).append (line + "\n");
00604     else {
00605       (*rb.data).append (line, 0, br_old);
00606       break;
00607     }
00608   }
00609   if (brace_count)  {
00610     // end-of-file reached
00611     // restore initial position
00612     is.clear();
00613     is.seekg (start_pos, std::ios::beg);
00614     is.setstate (std::ios::failbit);
00615   }
00616   return is;
00617 }

The documentation for this class was generated from the following file:
Generated on Mon Nov 23 04:59:34 2009 for NAMD by  doxygen 1.3.9.1