matdb-dotcode.c++

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/*
 * matdb-dotcode: reads in Craig's Dotcode materials database.

 Copyright (C) 2009 Joseph Pingenot

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU Affero General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU Affero General Public License for more details.

 You should have received a copy of the GNU Affero General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <stdio.h>
#include <strings.h>
#include <stdlib.h>
#include "config.h"
#include <libmodelxx/matdb.h++>
#include <libmodelxx/matdb-dotcode.h++>

namespace kdotp {
  namespace libmodelxx {
    namespace structure {

#ifdef DEBUG
#undef DEBUG
#endif
#ifdef DEBUG_2
#undef DEBUG_2
#endif

      /*Functions to be used by the hash.*/
      static void destroy_string(gpointer data) {
  free((char*)data);
      }
      static void destroy_double(gpointer data){
  free((double*)data);
      }
      static void destroy_inner_bowhash(gpointer data) {
  g_hash_table_unref((GHashTable*)data);
      }

      int insert_into_matdb(struct matdb *mdb, struct matdb_material **mat, struct matdb_bowing **bow) {
  if((*mat) != NULL) {
#ifdef DEBUG
    fprintf(stderr, "inserting material %s\n", (*mat)->name->str);
#endif
    g_hash_table_insert(mdb->materials, (gpointer)g_strdup((*mat)->name->str), (gpointer)(*mat));
    (*mat) = NULL;
  }
  if((*bow) != NULL) {
#ifdef DEBUG
    fprintf(stderr, "inserting bowing %s:%s\n", (*bow)->from->str, (*bow)->to->str);
#endif
    /*Inner table*/
    GHashTable *it;
    if((it=(GHashTable*)g_hash_table_lookup(mdb->bowings, (*bow)->from->str)) == NULL) {
      if((it = g_hash_table_new_full(&g_str_hash, &g_str_equal, &destroy_string, &destroy_inner_bowhash)) == NULL) {
        (*bow) = NULL;
        return 1;
      }
      g_hash_table_insert(mdb->bowings, (*bow)->from->str, it);
#ifdef DEBUG
      fprintf(stderr, "Got new hash table (from=%s)\n", (*bow)->from->str);
#endif
    }
    g_hash_table_insert(it, (gpointer)g_strdup((*bow)->to->str), (gpointer)(*bow));
    (*bow) = NULL;
  }
  return 0;
      }

      /*Removes leading and trailing whitespace, comments, and reduces
  redundant whitespace down to one tab, makes an empty line an empty string.*/
      static void prettify_line(char *line) {
  register char *look;
  register char *write;
  register int in_whitespace;
  register int leading_whitespace;
  for(look=write=line, in_whitespace=0, leading_whitespace=1; *look != '\0'; look++) {
#ifdef DEBUG_2
    fprintf(stderr, " look=%d(%c) write=%d(%c) in_whitespace=%d leading_whitespace=%d: ", (look-line), *look, (write-line), *write, in_whitespace, leading_whitespace);
#endif
    if(*look == '#') {
#ifdef DEBUG_2
      fprintf(stderr, "comment\n");
#endif
      *write = '\0';
      break;
    }
    switch(*look) {
    case ' ':
    case '\n':
    case '\t':
#ifdef DEBUG_2
      fprintf(stderr, "whitespace\n");
#endif
    if((!leading_whitespace) && (!in_whitespace)) *write++ = '\t';
    in_whitespace=1;
    break;
    default:
#ifdef DEBUG_2
      fprintf(stderr, "default\n");
#endif
      *write++ = *look;
      in_whitespace=leading_whitespace=0;
    }
  }
  *write='\0';
  for(look=write=line; *look != '\0'; look++) {
    switch(*look) {
    case ' ':
    case '\n':
    case '\t':
      if(*(look+1) == '\0') {
        *look = '\0';
      }
    }
  }
      }

      /*Error values:
       *   0: success
       *   1: failure malloc'ing / initializing mdb struct
       *   2: failure opening file.
       *   4: failure reading line.
       *   8: warning reading line: no tab separator (line parsing error)
       *  16: warning reading line: bad section declaration
       *  32: warning reading line: unable to allocate material struct.
       *  64: warning reading line: ignored line (unallocated material struct)
       * 128: warning reading line: unable to allocate bowing struct
       * 256: warning reading line: ignored line (unallocated bowing struct)
       * 512: warning reading file: improper section detected (programming
       *   error)
       *1024: warning reading file: no : separator in bowing materials
       *   description.
       *2048: warning reading file: unable to read numeric value for property.
       */
      struct matdb* read_matdb_dotcode(const GString *name, int* err) {
#ifdef DEBUG_2
  fprintf(stderr, "in read_matdb_dotcode(%s, %d)\n", name->str, *err);
#endif
  *err=0;
  struct matdb *mdb = (struct matdb*)malloc(sizeof(struct matdb));
  if(mdb == NULL) {*err = 1; return NULL;}

  double *value;
  if((mdb->materials = g_hash_table_new_full(&g_str_hash, &g_str_equal, &destroy_string, &destroy_material_gpointer)) == NULL) {
    *err = 1;
    free(mdb);
    return NULL;
  }
  if((mdb->bowings = g_hash_table_new_full(&g_str_hash, &g_str_equal, &destroy_string, &destroy_bowing_gpointer)) == NULL) {
    *err = 1;
    g_hash_table_unref(mdb->materials);
    free(mdb);
    return NULL;
  }
  struct matdb_material *mat = NULL;
  struct matdb_bowing *bow = NULL;
  /*Valid sections:
   * 0 (no/global section)
   * 1 (material)
   * 2 (bow)
   */
  int section=0;
  size_t n;
  char *line;
  FILE *infile = fopen(name->str, "r");
  if(infile == NULL) {
    g_hash_table_unref(mdb->materials);
    g_hash_table_unref(mdb->bowings);
    free(mdb);
    *err=2;
    return NULL;
#ifdef DEBUG_2
  }else{
    fprintf(stderr, "infile=%x\n", (unsigned int)infile);
#endif
  }
  int val;
  while(!feof(infile)) {
#ifdef DEBUG
    fprintf(stderr, "mat=%x(%s), bow=%x(%s:%s)\n", (unsigned int)mat, mat?mat->name->str:"", (unsigned int)bow, bow?bow->from->str:"", bow?bow->to->str:"");
#endif
    line=NULL;
    if((val = getline(&line, &n, infile)) == -1) {
#ifdef DEBUG_2
      fprintf(stderr, "getline returned %d\n", val); 
#endif
      if(!feof(infile)) *err = 4;
      //fclose(infile);
      break;
    }
#ifdef DEBUG_2
    fprintf(stderr, "line=(%s)\n", line);
#endif
    prettify_line(line);
#ifdef DEBUG
    fprintf(stderr, "%d: prettified line=(%s)\n", section, line);
#endif
    if(*line == '\0') {
      free(line);
      continue;
    }
    char *i = index(line, '\t');
    if(i == NULL) {
      *err &= 8;
    }
    *i++ = '\0';
    /*At this point, we have line which stores the first word on the
      line, and i which stores the second word on the line.
    */
    char *to;
    GHashTable *ht;
#ifdef DEBUG_2
    fprintf(stderr, "part_a=(%s) part_b=(%s)\n", line, i);
#endif
    /*If we have a material or bowing underway, save it off*/
    if(strcasecmp(line, "material") == 0) {
      insert_into_matdb(mdb, &mat, &bow);
      if((mat = (struct matdb_material*)malloc(sizeof(struct matdb_material))) == NULL) {
        *err &= 32;
      }
      if((mat->name = g_string_new(i)) == NULL) {
        *err &= 32;
        free(mat);
        section=0;
        continue;
      }
      if((mat->properties = g_hash_table_new_full(&g_str_hash, &g_str_equal, &destroy_string, &destroy_double)) == NULL) {
        *err &= 32;
        g_string_free(mat->name, TRUE);
        free(bow);
        section=0;
        continue;
      }
#ifdef DEBUG_2
      fprintf(stderr, "new material (%s):\n", i);
#endif
      section=1;
    }else if(strcasecmp(line, "bow") == 0) {
      insert_into_matdb(mdb, &mat, &bow);
      if((bow = (struct matdb_bowing*)malloc(sizeof(struct matdb_bowing))) == NULL) {
        *err &= 128;
      }
      if((to = index(i, ':')) == NULL) {
        *err &= 1024;
        free(bow);
        section=0;
        continue;
      }
      *to++ = '\0';
      /*Same trick as before, but i now stores the from material,
        and to the to material
      */
      if((bow->from = g_string_new(i)) == NULL) {
        *err &= 128;
        free(bow);
        section=0;
        continue;
      }
      if((bow->to = g_string_new(to)) == NULL) {
        *err &= 128;
        g_string_free(bow->from, TRUE);
        free(bow);
        section=0;
        continue;
      }
      if((bow->properties = g_hash_table_new_full(&g_str_hash, &g_str_equal, &destroy_string, &destroy_double)) == NULL) {
        *err &= 128;
        g_string_free(bow->to, TRUE);
        g_string_free(bow->from, TRUE);
        free(bow);
        section=0;
        continue;
      }
#ifdef DEBUG_2
      fprintf(stderr, "new bowing (%s:%s):\n", i, to);
#endif
      section=2;
    }else{
#ifdef DEBUG
      fprintf(stderr, "\t%d/%s\t", section, line);
#endif
      /*Process a property.*/
      switch(section) {
      case 1:
#ifdef DEBUG
        fprintf(stderr, "(1)\t");
#endif
        ht = mat->properties;
        break;
      case 2:
#ifdef DEBUG
        fprintf(stderr, "(2)\t");
#endif
        ht = bow->properties;
        break;
      default:
#ifdef DEBUG
        fprintf(stderr, "(default)\t");
#endif
        *err &= 16;
        section = 0;
      }
      if(section == 0) {
#ifdef DEBUG
        fprintf(stderr, "section was 0\n");
#endif
        continue;
      }
      if((value = (double*)malloc(sizeof(double))) == NULL) {
        *err &= 2048;
#ifdef DEBUG
        fprintf(stderr, "malloc of value failed\n");
#endif
        continue;
      }
      int num;
      if((num=sscanf(i, " %lg", value)) != 1) {
        *err &= 2048;
        free(value);
#ifdef DEBUG
        fprintf(stderr, "bad sscanf to get value (scanned \"%s\", returned %d)\n", i, num);
#endif
        continue;
      }
      g_hash_table_insert(ht, g_strdup(line), value);
#ifdef DEBUG
      fprintf(stderr, "%g(%s)\n", *value, line);
#endif
    }
    free(line);
    line=i=to=NULL;
    value=NULL;
  }
  fclose(infile);
  insert_into_matdb(mdb, &mat, &bow);
  return mdb;
      }


    }
  }
}