/* glpmpl04.c */

 /***********************************************************************

 *  This code is part of GLPK (GNU Linear Programming Kit).

 *

 *  Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,

 *  2009, 2010 Andrew Makhorin, Department for Applied Informatics,

 *  Moscow Aviation Institute, Moscow, Russia. All rights reserved.

 *  E-mail: <mao@gnu.org>.

 *

 *  GLPK is free software: you can redistribute it and/or modify it

 *  under the terms of the GNU General Public License as published by

 *  the Free Software Foundation, either version 3 of the License, or

 *  (at your option) any later version.

 *

 *  GLPK 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 General Public

 *  License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with GLPK. If not, see <http://www.gnu.org/licenses/>.

 ***********************************************************************/

 #define _GLPSTD_ERRNO

 #define _GLPSTD_STDIO

 #include "glpmpl.h"

 #define xfault xerror

 #define dmp_create_poolx(size) dmp_create_pool()

 /**********************************************************************/

 /* * *              GENERATING AND POSTSOLVING MODEL              * * */

 /**********************************************************************/

 /*----------------------------------------------------------------------

 -- alloc_content - allocate content arrays for all model objects.

 --

 -- This routine allocates content arrays for all existing model objects

 -- and thereby finalizes creating model.

 --

 -- This routine must be called immediately after reading model section,

 -- i.e. before reading data section or generating model. */

 void alloc_content(MPL *mpl)

 {     STATEMENT *stmt;

       /* walk through all model statements */

       for (stmt = mpl->model; stmt != NULL; stmt = stmt->next)

       {  switch (stmt->type)

          {  case A_SET:

                /* model set */

                xassert(stmt->u.set->array == NULL);

                stmt->u.set->array = create_array(mpl, A_ELEMSET,

                   stmt->u.set->dim);

                break;

             case A_PARAMETER:

                /* model parameter */

                xassert(stmt->u.par->array == NULL);

                switch (stmt->u.par->type)

                {  case A_NUMERIC:

                   case A_INTEGER:

                   case A_BINARY:

                      stmt->u.par->array = create_array(mpl, A_NUMERIC,

                         stmt->u.par->dim);

                      break;

                   case A_SYMBOLIC:

                      stmt->u.par->array = create_array(mpl, A_SYMBOLIC,

                         stmt->u.par->dim);

                      break;

                   default:

                      xassert(stmt != stmt);

                }

                break;

             case A_VARIABLE:

                /* model variable */

                xassert(stmt->u.var->array == NULL);

                stmt->u.var->array = create_array(mpl, A_ELEMVAR,

                   stmt->u.var->dim);

                break;

             case A_CONSTRAINT:

                /* model constraint/objective */

                xassert(stmt->u.con->array == NULL);

                stmt->u.con->array = create_array(mpl, A_ELEMCON,

                   stmt->u.con->dim);

                break;

 #if 1 /* 11/II-2008 */

             case A_TABLE:

 #endif

             case A_SOLVE:

             case A_CHECK:

             case A_DISPLAY:

             case A_PRINTF:

             case A_FOR:

                /* functional statements have no content array */

                break;

             default:

                xassert(stmt != stmt);

          }

       }

       return;

 }

 /*----------------------------------------------------------------------

 -- generate_model - generate model.

 --

 -- This routine executes the model statements which precede the solve

 -- statement. */

 void generate_model(MPL *mpl)

 {     STATEMENT *stmt;

       xassert(!mpl->flag_p);

       for (stmt = mpl->model; stmt != NULL; stmt = stmt->next)

       {  execute_statement(mpl, stmt);

          if (mpl->stmt->type == A_SOLVE) break;

       }

       mpl->stmt = stmt;

       return;

 }

 /*----------------------------------------------------------------------

 -- build_problem - build problem instance.

 --

 -- This routine builds lists of rows and columns for problem instance,

 -- which corresponds to the generated model. */

 void build_problem(MPL *mpl)

 {     STATEMENT *stmt;

       MEMBER *memb;

       VARIABLE *v;

       CONSTRAINT *c;

       FORMULA *t;

       int i, j;

       xassert(mpl->m == 0);

       xassert(mpl->n == 0);

       xassert(mpl->row == NULL);

       xassert(mpl->col == NULL);

       /* check that all elemental variables has zero column numbers */

       for (stmt = mpl->model; stmt != NULL; stmt = stmt->next)

       {  if (stmt->type == A_VARIABLE)

          {  v = stmt->u.var;

             for (memb = v->array->head; memb != NULL; memb = memb->next)

                xassert(memb->value.var->j == 0);

          }

       }

       /* assign row numbers to elemental constraints and objectives */

       for (stmt = mpl->model; stmt != NULL; stmt = stmt->next)

       {  if (stmt->type == A_CONSTRAINT)

          {  c = stmt->u.con;

             for (memb = c->array->head; memb != NULL; memb = memb->next)

             {  xassert(memb->value.con->i == 0);

                memb->value.con->i = ++mpl->m;

                /* walk through linear form and mark elemental variables,

                   which are referenced at least once */

                for (t = memb->value.con->form; t != NULL; t = t->next)

                {  xassert(t->var != NULL);

                   t->var->memb->value.var->j = -1;

                }

             }

          }

       }

       /* assign column numbers to marked elemental variables */

       for (stmt = mpl->model; stmt != NULL; stmt = stmt->next)

       {  if (stmt->type == A_VARIABLE)

          {  v = stmt->u.var;

             for (memb = v->array->head; memb != NULL; memb = memb->next)

                if (memb->value.var->j != 0) memb->value.var->j =

                   ++mpl->n;

          }

       }

       /* build list of rows */

       mpl->row = xcalloc(1+mpl->m, sizeof(ELEMCON *));

       for (i = 1; i <= mpl->m; i++) mpl->row[i] = NULL;

       for (stmt = mpl->model; stmt != NULL; stmt = stmt->next)

       {  if (stmt->type == A_CONSTRAINT)

          {  c = stmt->u.con;

             for (memb = c->array->head; memb != NULL; memb = memb->next)

             {  i = memb->value.con->i;

                xassert(1 <= i && i <= mpl->m);

                xassert(mpl->row[i] == NULL);

                mpl->row[i] = memb->value.con;

             }

          }

       }

       for (i = 1; i <= mpl->m; i++) xassert(mpl->row[i] != NULL);

       /* build list of columns */

       mpl->col = xcalloc(1+mpl->n, sizeof(ELEMVAR *));

       for (j = 1; j <= mpl->n; j++) mpl->col[j] = NULL;

       for (stmt = mpl->model; stmt != NULL; stmt = stmt->next)

       {  if (stmt->type == A_VARIABLE)

          {  v = stmt->u.var;

             for (memb = v->array->head; memb != NULL; memb = memb->next)

             {  j = memb->value.var->j;

                if (j == 0) continue;

                xassert(1 <= j && j <= mpl->n);

                xassert(mpl->col[j] == NULL);

                mpl->col[j] = memb->value.var;

             }

          }

       }

       for (j = 1; j <= mpl->n; j++) xassert(mpl->col[j] != NULL);

       return;

 }

 /*----------------------------------------------------------------------

 -- postsolve_model - postsolve model.

 --

 -- This routine executes the model statements which follow the solve

 -- statement. */

 void postsolve_model(MPL *mpl)

 {     STATEMENT *stmt;

       xassert(!mpl->flag_p);

       mpl->flag_p = 1;

       for (stmt = mpl->stmt; stmt != NULL; stmt = stmt->next)

          execute_statement(mpl, stmt);

       mpl->stmt = NULL;

       return;

 }

 /*----------------------------------------------------------------------

 -- clean_model - clean model content.

 --

 -- This routine cleans the model content that assumes deleting all stuff

 -- dynamically allocated on generating/postsolving phase.

 --

 -- Actually cleaning model content is not needed. This function is used

 -- mainly to be sure that there were no logical errors on using dynamic

 -- memory pools during the generation phase.

 --

 -- NOTE: This routine must not be called if any errors were detected on

 --       the generation phase. */

 void clean_model(MPL *mpl)

 {     STATEMENT *stmt;

       for (stmt = mpl->model; stmt != NULL; stmt = stmt->next)

          clean_statement(mpl, stmt);

       /* check that all atoms have been returned to their pools */

       if (dmp_in_use(mpl->strings).lo != 0)

          error(mpl, "internal logic error: %d string segment(s) were lo"

             "st", dmp_in_use(mpl->strings).lo);

       if (dmp_in_use(mpl->symbols).lo != 0)

          error(mpl, "internal logic error: %d symbol(s) were lost",

             dmp_in_use(mpl->symbols).lo);

       if (dmp_in_use(mpl->tuples).lo != 0)

          error(mpl, "internal logic error: %d n-tuple component(s) were"

             " lost", dmp_in_use(mpl->tuples).lo);

       if (dmp_in_use(mpl->arrays).lo != 0)

          error(mpl, "internal logic error: %d array(s) were lost",

             dmp_in_use(mpl->arrays).lo);

       if (dmp_in_use(mpl->members).lo != 0)

          error(mpl, "internal logic error: %d array member(s) were lost"

             , dmp_in_use(mpl->members).lo);

       if (dmp_in_use(mpl->elemvars).lo != 0)

          error(mpl, "internal logic error: %d elemental variable(s) wer"

             "e lost", dmp_in_use(mpl->elemvars).lo);

       if (dmp_in_use(mpl->formulae).lo != 0)

          error(mpl, "internal logic error: %d linear term(s) were lost",

             dmp_in_use(mpl->formulae).lo);

       if (dmp_in_use(mpl->elemcons).lo != 0)

          error(mpl, "internal logic error: %d elemental constraint(s) w"

             "ere lost", dmp_in_use(mpl->elemcons).lo);

       return;

 }

 /**********************************************************************/

 /* * *                        INPUT/OUTPUT                        * * */

 /**********************************************************************/

 /*----------------------------------------------------------------------

 -- open_input - open input text file.

 --

 -- This routine opens the input text file for scanning. */

 void open_input(MPL *mpl, char *file)

 {     mpl->line = 0;

       mpl->c = '\n';

       mpl->token = 0;

       mpl->imlen = 0;

       mpl->image[0] = '\0';

       mpl->value = 0.0;

       mpl->b_token = T_EOF;

       mpl->b_imlen = 0;

       mpl->b_image[0] = '\0';

       mpl->b_value = 0.0;

       mpl->f_dots = 0;

       mpl->f_scan = 0;

       mpl->f_token = 0;

       mpl->f_imlen = 0;

       mpl->f_image[0] = '\0';

       mpl->f_value = 0.0;

       memset(mpl->context, ' ', CONTEXT_SIZE);

       mpl->c_ptr = 0;

       xassert(mpl->in_fp == NULL);

       mpl->in_fp = xfopen(file, "r");

       if (mpl->in_fp == NULL)

          error(mpl, "unable to open %s - %s", file, xerrmsg());

       mpl->in_file = file;

       /* scan the very first character */

       get_char(mpl);

       /* scan the very first token */

       get_token(mpl);

       return;

 }

 /*----------------------------------------------------------------------

 -- read_char - read next character from input text file.

 --

 -- This routine returns a next ASCII character read from the input text

 -- file. If the end of file has been reached, EOF is returned. */

 int read_char(MPL *mpl)

 {     int c;

       xassert(mpl->in_fp != NULL);

       c = xfgetc(mpl->in_fp);

       if (c < 0)

       {  if (xferror(mpl->in_fp))

             error(mpl, "read error on %s - %s", mpl->in_file,

                xerrmsg());

          c = EOF;

       }

       return c;

 }

 /*----------------------------------------------------------------------

 -- close_input - close input text file.

 --

 -- This routine closes the input text file. */

 void close_input(MPL *mpl)

 {     xassert(mpl->in_fp != NULL);

       xfclose(mpl->in_fp);

       mpl->in_fp = NULL;

       mpl->in_file = NULL;

       return;

 }

 /*----------------------------------------------------------------------

 -- open_output - open output text file.

 --

 -- This routine opens the output text file for writing data produced by

 -- display and printf statements. */

 void open_output(MPL *mpl, char *file)

 {     xassert(mpl->out_fp == NULL);

       if (file == NULL)

       {  file = "<stdout>";

          mpl->out_fp = (void *)stdout;

       }

       else

       {  mpl->out_fp = xfopen(file, "w");

          if (mpl->out_fp == NULL)

             error(mpl, "unable to create %s - %s", file, xerrmsg());

       }

       mpl->out_file = xmalloc(strlen(file)+1);

       strcpy(mpl->out_file, file);

       return;

 }

 /*----------------------------------------------------------------------

 -- write_char - write next character to output text file.

 --

 -- This routine writes an ASCII character to the output text file. */

 void write_char(MPL *mpl, int c)

 {     xassert(mpl->out_fp != NULL);

       if (mpl->out_fp == (void *)stdout)

          xprintf("%c", c);

       else

          xfprintf(mpl->out_fp, "%c", c);

       return;

 }

 /*----------------------------------------------------------------------

 -- write_text - format and write text to output text file.

 --

 -- This routine formats a text using the format control string and then

 -- writes this text to the output text file. */

 void write_text(MPL *mpl, char *fmt, ...)

 {     va_list arg;

       char buf[OUTBUF_SIZE], *c;

       va_start(arg, fmt);

       vsprintf(buf, fmt, arg);

       xassert(strlen(buf) < sizeof(buf));

       va_end(arg);

       for (c = buf; *c != '\0'; c++) write_char(mpl, *c);

       return;

 }

 /*----------------------------------------------------------------------

 -- flush_output - finalize writing data to output text file.

 --

 -- This routine finalizes writing data to the output text file. */

 void flush_output(MPL *mpl)

 {     xassert(mpl->out_fp != NULL);

       if (mpl->out_fp != (void *)stdout)

       {  xfflush(mpl->out_fp);

          if (xferror(mpl->out_fp))

             error(mpl, "write error on %s - %s", mpl->out_file,

                xerrmsg());

       }

       return;

 }

 /**********************************************************************/

 /* * *                      SOLVER INTERFACE                      * * */

 /**********************************************************************/

 /*----------------------------------------------------------------------

 -- error - print error message and terminate model processing.

 --

 -- This routine formats and prints an error message and then terminates

 -- model processing. */

 void error(MPL *mpl, char *fmt, ...)

 {     va_list arg;

       char msg[4095+1];

       va_start(arg, fmt);

       vsprintf(msg, fmt, arg);

       xassert(strlen(msg) < sizeof(msg));

       va_end(arg);

       switch (mpl->phase)

       {  case 1:

          case 2:

             /* translation phase */

             xprintf("%s:%d: %s\n",

                mpl->in_file == NULL ? "(unknown)" : mpl->in_file,

                mpl->line, msg);

             print_context(mpl);

             break;

          case 3:

             /* generation/postsolve phase */

             xprintf("%s:%d: %s\n",

                mpl->mod_file == NULL ? "(unknown)" : mpl->mod_file,

                mpl->stmt == NULL ? 0 : mpl->stmt->line, msg);

             break;

          default:

             xassert(mpl != mpl);

       }

       mpl->phase = 4;

       longjmp(mpl->jump, 1);

       /* no return */

 }

 /*----------------------------------------------------------------------

 -- warning - print warning message and continue model processing.

 --

 -- This routine formats and prints a warning message and returns to the

 -- calling program. */

 void warning(MPL *mpl, char *fmt, ...)

 {     va_list arg;

       char msg[4095+1];

       va_start(arg, fmt);

       vsprintf(msg, fmt, arg);

       xassert(strlen(msg) < sizeof(msg));

       va_end(arg);

       switch (mpl->phase)

       {  case 1:

          case 2:

             /* translation phase */

             xprintf("%s:%d: warning: %s\n",

                mpl->in_file == NULL ? "(unknown)" : mpl->in_file,

                mpl->line, msg);

             break;

          case 3:

             /* generation/postsolve phase */

             xprintf("%s:%d: warning: %s\n",

                mpl->mod_file == NULL ? "(unknown)" : mpl->mod_file,

                mpl->stmt == NULL ? 0 : mpl->stmt->line, msg);

             break;

          default:

             xassert(mpl != mpl);

       }

       return;

 }

 /*----------------------------------------------------------------------

 -- mpl_initialize - create and initialize translator database.

 --

 -- *Synopsis*

 --

 -- #include "glpmpl.h"

 -- MPL *mpl_initialize(void);

 --

 -- *Description*

 --

 -- The routine mpl_initialize creates and initializes the database used

 -- by the GNU MathProg translator.

 --

 -- *Returns*

 --

 -- The routine returns a pointer to the database created. */

 MPL *mpl_initialize(void)

 {     MPL *mpl;

       mpl = xmalloc(sizeof(MPL));

       /* scanning segment */

       mpl->line = 0;

       mpl->c = 0;

       mpl->token = 0;

       mpl->imlen = 0;

       mpl->image = xcalloc(MAX_LENGTH+1, sizeof(char));

       mpl->image[0] = '\0';

       mpl->value = 0.0;

       mpl->b_token = 0;

       mpl->b_imlen = 0;

       mpl->b_image = xcalloc(MAX_LENGTH+1, sizeof(char));

       mpl->b_image[0] = '\0';

       mpl->b_value = 0.0;

       mpl->f_dots = 0;

       mpl->f_scan = 0;

       mpl->f_token = 0;

       mpl->f_imlen = 0;

       mpl->f_image = xcalloc(MAX_LENGTH+1, sizeof(char));

       mpl->f_image[0] = '\0';

       mpl->f_value = 0.0;

       mpl->context = xcalloc(CONTEXT_SIZE, sizeof(char));

       memset(mpl->context, ' ', CONTEXT_SIZE);

       mpl->c_ptr = 0;

       mpl->flag_d = 0;

       /* translating segment */

       mpl->pool = dmp_create_poolx(0);

       mpl->tree = avl_create_tree(avl_strcmp, NULL);

       mpl->model = NULL;

       mpl->flag_x = 0;

       mpl->as_within = 0;

       mpl->as_in = 0;

       mpl->as_binary = 0;

       mpl->flag_s = 0;

       /* common segment */

       mpl->strings = dmp_create_poolx(sizeof(STRING));

       mpl->symbols = dmp_create_poolx(sizeof(SYMBOL));

       mpl->tuples = dmp_create_poolx(sizeof(TUPLE));

       mpl->arrays = dmp_create_poolx(sizeof(ARRAY));

       mpl->members = dmp_create_poolx(sizeof(MEMBER));

       mpl->elemvars = dmp_create_poolx(sizeof(ELEMVAR));

       mpl->formulae = dmp_create_poolx(sizeof(FORMULA));

       mpl->elemcons = dmp_create_poolx(sizeof(ELEMCON));

       mpl->a_list = NULL;

       mpl->sym_buf = xcalloc(255+1, sizeof(char));

       mpl->sym_buf[0] = '\0';

       mpl->tup_buf = xcalloc(255+1, sizeof(char));

       mpl->tup_buf[0] = '\0';

       /* generating/postsolving segment */

       mpl->rand = rng_create_rand();

       mpl->flag_p = 0;

       mpl->stmt = NULL;

 #if 1 /* 11/II-2008 */

       mpl->dca = NULL;

 #endif

       mpl->m = 0;

       mpl->n = 0;

       mpl->row = NULL;

       mpl->col = NULL;

       /* input/output segment */

       mpl->in_fp = NULL;

       mpl->in_file = NULL;

       mpl->out_fp = NULL;

       mpl->out_file = NULL;

       mpl->prt_fp = NULL;

       mpl->prt_file = NULL;

       /* solver interface segment */

       if (setjmp(mpl->jump)) xassert(mpl != mpl);

       mpl->phase = 0;

       mpl->mod_file = NULL;

       mpl->mpl_buf = xcalloc(255+1, sizeof(char));

       mpl->mpl_buf[0] = '\0';

       return mpl;

 }

 /*----------------------------------------------------------------------

 -- mpl_read_model - read model section and optional data section.

 --

 -- *Synopsis*

 --

 -- #include "glpmpl.h"

 -- int mpl_read_model(MPL *mpl, char *file, int skip_data);

 --

 -- *Description*

 --

 -- The routine mpl_read_model reads model section and optionally data

 -- section, which may follow the model section, from the text file,

 -- whose name is the character string file, performs translating model

 -- statements and data blocks, and stores all the information in the

 -- translator database.

 --

 -- The parameter skip_data is a flag. If the input file contains the

 -- data section and this flag is set, the data section is not read as

 -- if there were no data section and a warning message is issued. This

 -- allows reading the data section from another input file.

 --

 -- This routine should be called once after the routine mpl_initialize

 -- and before other API routines.

 --

 -- *Returns*

 --

 -- The routine mpl_read_model returns one the following codes:

 --

 -- 1 - translation successful. The input text file contains only model

 --     section. In this case the calling program may call the routine

 --     mpl_read_data to read data section from another file.

 -- 2 - translation successful. The input text file contains both model

 --     and data section.

 -- 4 - processing failed due to some errors. In this case the calling

 --     program should call the routine mpl_terminate to terminate model

 --     processing. */

 int mpl_read_model(MPL *mpl, char *file, int skip_data)

 {     if (mpl->phase != 0)

          xfault("mpl_read_model: invalid call sequence\n");

       if (file == NULL)

          xfault("mpl_read_model: no input filename specified\n");

       /* set up error handler */

       if (setjmp(mpl->jump)) goto done;

       /* translate model section */

       mpl->phase = 1;

       xprintf("Reading model section from %s...\n", file);

       open_input(mpl, file);

       model_section(mpl);

       if (mpl->model == NULL)

          error(mpl, "empty model section not allowed");

       /* save name of the input text file containing model section for

          error diagnostics during the generation phase */

       mpl->mod_file = xcalloc(strlen(file)+1, sizeof(char));

       strcpy(mpl->mod_file, mpl->in_file);

       /* allocate content arrays for all model objects */

       alloc_content(mpl);

       /* optional data section may begin with the keyword 'data' */

       if (is_keyword(mpl, "data"))

       {  if (skip_data)

          {  warning(mpl, "data section ignored");

             goto skip;

          }

          mpl->flag_d = 1;

          get_token(mpl /* data */);

          if (mpl->token != T_SEMICOLON)

             error(mpl, "semicolon missing where expected");

          get_token(mpl /* ; */);

          /* translate data section */

          mpl->phase = 2;

          xprintf("Reading data section from %s...\n", file);

          data_section(mpl);

       }

       /* process end statement */

       end_statement(mpl);

 skip: xprintf("%d line%s were read\n",

          mpl->line, mpl->line == 1 ? "" : "s");

       close_input(mpl);

 done: /* return to the calling program */

       return mpl->phase;

 }

 /*----------------------------------------------------------------------

 -- mpl_read_data - read data section.

 --

 -- *Synopsis*

 --

 -- #include "glpmpl.h"

 -- int mpl_read_data(MPL *mpl, char *file);

 --

 -- *Description*

 --

 -- The routine mpl_read_data reads data section from the text file,

 -- whose name is the character string file, performs translating data

 -- blocks, and stores the data read in the translator database.

 --

 -- If this routine is used, it should be called once after the routine

 -- mpl_read_model and if the latter returned the code 1.

 --

 -- *Returns*

 --

 -- The routine mpl_read_data returns one of the following codes:

 --

 -- 2 - data section has been successfully processed.

 -- 4 - processing failed due to some errors. In this case the calling

 --     program should call the routine mpl_terminate to terminate model

 --     processing. */

 int mpl_read_data(MPL *mpl, char *file)

 #if 0 /* 02/X-2008 */

 {     if (mpl->phase != 1)

 #else

 {     if (!(mpl->phase == 1 || mpl->phase == 2))

 #endif

          xfault("mpl_read_data: invalid call sequence\n");

       if (file == NULL)

          xfault("mpl_read_data: no input filename specified\n");

       /* set up error handler */

       if (setjmp(mpl->jump)) goto done;

       /* process data section */

       mpl->phase = 2;

       xprintf("Reading data section from %s...\n", file);

       mpl->flag_d = 1;

       open_input(mpl, file);

       /* in this case the keyword 'data' is optional */

       if (is_literal(mpl, "data"))

       {  get_token(mpl /* data */);

          if (mpl->token != T_SEMICOLON)

             error(mpl, "semicolon missing where expected");

          get_token(mpl /* ; */);

       }

       data_section(mpl);

       /* process end statement */

       end_statement(mpl);

       xprintf("%d line%s were read\n",

          mpl->line, mpl->line == 1 ? "" : "s");

       close_input(mpl);

 done: /* return to the calling program */

       return mpl->phase;

 }

 /*----------------------------------------------------------------------

 -- mpl_generate - generate model.

 --

 -- *Synopsis*

 --

 -- #include "glpmpl.h"

 -- int mpl_generate(MPL *mpl, char *file);

 --

 -- *Description*

 --

 -- The routine mpl_generate generates the model using its description

 -- stored in the translator database. This phase means generating all

 -- variables, constraints, and objectives, executing check and display

 -- statements, which precede the solve statement (if it is presented),

 -- and building the problem instance.

 --

 -- The character string file specifies the name of output text file, to

 -- which output produced by display statements should be written. It is

 -- allowed to specify NULL, in which case the output goes to stdout via

 -- the routine print.

 --

 -- This routine should be called once after the routine mpl_read_model

 -- or mpl_read_data and if one of the latters returned the code 2.

 --

 -- *Returns*

 --

 -- The routine mpl_generate returns one of the following codes:

 --

 -- 3 - model has been successfully generated. In this case the calling

 --     program may call other api routines to obtain components of the

 --     problem instance from the translator database.

 -- 4 - processing failed due to some errors. In this case the calling

 --     program should call the routine mpl_terminate to terminate model

 --     processing. */

 int mpl_generate(MPL *mpl, char *file)

 {     if (!(mpl->phase == 1 || mpl->phase == 2))

          xfault("mpl_generate: invalid call sequence\n");

       /* set up error handler */

       if (setjmp(mpl->jump)) goto done;

       /* generate model */

       mpl->phase = 3;

       open_output(mpl, file);

       generate_model(mpl);

       flush_output(mpl);

       /* build problem instance */

       build_problem(mpl);

       /* generation phase has been finished */

       xprintf("Model has been successfully generated\n");

 done: /* return to the calling program */

       return mpl->phase;

 }

 /*----------------------------------------------------------------------

 -- mpl_get_prob_name - obtain problem (model) name.

 --

 -- *Synopsis*

 --

 -- #include "glpmpl.h"

 -- char *mpl_get_prob_name(MPL *mpl);

 --

 -- *Returns*

 --

 -- The routine mpl_get_prob_name returns a pointer to internal buffer,

 -- which contains symbolic name of the problem (model).

 --

 -- *Note*

 --

 -- Currently MathProg has no feature to assign a symbolic name to the

 -- model. Therefore the routine mpl_get_prob_name tries to construct

 -- such name using the name of input text file containing model section,

 -- although this is not a good idea (due to portability problems). */

 char *mpl_get_prob_name(MPL *mpl)

 {     char *name = mpl->mpl_buf;

       char *file = mpl->mod_file;

       int k;

       if (mpl->phase != 3)

          xfault("mpl_get_prob_name: invalid call sequence\n");

       for (;;)

       {  if (strchr(file, '/') != NULL)

             file = strchr(file, '/') + 1;

          else if (strchr(file, '\\') != NULL)

             file = strchr(file, '\\') + 1;

          else if (strchr(file, ':') != NULL)

             file = strchr(file, ':') + 1;

          else

             break;

       }

       for (k = 0; ; k++)

       {  if (k == 255) break;

          if (!(isalnum((unsigned char)*file) || *file == '_')) break;

          name[k] = *file++;

       }

       if (k == 0)

          strcpy(name, "Unknown");

       else

          name[k] = '\0';

       xassert(strlen(name) <= 255);

       return name;

 }

 /*----------------------------------------------------------------------

 -- mpl_get_num_rows - determine number of rows.

 --

 -- *Synopsis*

 --

 -- #include "glpmpl.h"

 -- int mpl_get_num_rows(MPL *mpl);

 --

 -- *Returns*

 --

 -- The routine mpl_get_num_rows returns total number of rows in the

 -- problem, where each row is an individual constraint or objective. */

 int mpl_get_num_rows(MPL *mpl)

 {     if (mpl->phase != 3)

          xfault("mpl_get_num_rows: invalid call sequence\n");

       return mpl->m;

 }

 /*----------------------------------------------------------------------

 -- mpl_get_num_cols - determine number of columns.

 --

 -- *Synopsis*

 --

 -- #include "glpmpl.h"

 -- int mpl_get_num_cols(MPL *mpl);

 --

 -- *Returns*

 --

 -- The routine mpl_get_num_cols returns total number of columns in the

 -- problem, where each column is an individual variable. */

 int mpl_get_num_cols(MPL *mpl)

 {     if (mpl->phase != 3)

          xfault("mpl_get_num_cols: invalid call sequence\n");

       return mpl->n;

 }

 /*----------------------------------------------------------------------

 -- mpl_get_row_name - obtain row name.

 --

 -- *Synopsis*

 --

 -- #include "glpmpl.h"

 -- char *mpl_get_row_name(MPL *mpl, int i);

 --

 -- *Returns*

 --

 -- The routine mpl_get_row_name returns a pointer to internal buffer,

 -- which contains symbolic name of i-th row of the problem. */

 char *mpl_get_row_name(MPL *mpl, int i)

 {     char *name = mpl->mpl_buf, *t;

       int len;

       if (mpl->phase != 3)

          xfault("mpl_get_row_name: invalid call sequence\n");

       if (!(1 <= i && i <= mpl->m))

          xfault("mpl_get_row_name: i = %d; row number out of range\n",

             i);

       strcpy(name, mpl->row[i]->con->name);

       len = strlen(name);

       xassert(len <= 255);

       t = format_tuple(mpl, '[', mpl->row[i]->memb->tuple);

       while (*t)

       {  if (len == 255) break;

          name[len++] = *t++;

       }

       name[len] = '\0';

       if (len == 255) strcpy(name+252, "...");

       xassert(strlen(name) <= 255);

       return name;

 }

 /*----------------------------------------------------------------------

 -- mpl_get_row_kind - determine row kind.

 --

 -- *Synopsis*

 --

 -- #include "glpmpl.h"

 -- int mpl_get_row_kind(MPL *mpl, int i);

 --

 -- *Returns*

 --

 -- The routine mpl_get_row_kind returns the kind of i-th row, which can

 -- be one of the following:

 --

 -- MPL_ST  - non-free (constraint) row;

 -- MPL_MIN - free (objective) row to be minimized;

 -- MPL_MAX - free (objective) row to be maximized. */

 int mpl_get_row_kind(MPL *mpl, int i)

 {     int kind;

       if (mpl->phase != 3)

          xfault("mpl_get_row_kind: invalid call sequence\n");

       if (!(1 <= i && i <= mpl->m))

          xfault("mpl_get_row_kind: i = %d; row number out of range\n",

             i);

       switch (mpl->row[i]->con->type)

       {  case A_CONSTRAINT:

             kind = MPL_ST; break;

          case A_MINIMIZE:

             kind = MPL_MIN; break;

          case A_MAXIMIZE:

             kind = MPL_MAX; break;

          default:

             xassert(mpl != mpl);

       }

       return kind;

 }

 /*----------------------------------------------------------------------

 -- mpl_get_row_bnds - obtain row bounds.

 --

 -- *Synopsis*

 --

 -- #include "glpmpl.h"

 -- int mpl_get_row_bnds(MPL *mpl, int i, double *lb, double *ub);

 --

 -- *Description*

 --

 -- The routine mpl_get_row_bnds stores lower and upper bounds of i-th

 -- row of the problem to the locations, which the parameters lb and ub

 -- point to, respectively. Besides the routine returns the type of the

 -- i-th row.

 --

 -- If some of the parameters lb and ub is NULL, the corresponding bound

 -- value is not stored.

 --

 -- Types and bounds have the following meaning:

 --

 --     Type           Bounds          Note

 --    -----------------------------------------------------------

 --    MPL_FR   -inf <  f(x) <  +inf   Free linear form

 --    MPL_LO     lb <= f(x) <  +inf   Inequality f(x) >= lb

 --    MPL_UP   -inf <  f(x) <=  ub    Inequality f(x) <= ub

 --    MPL_DB     lb <= f(x) <=  ub    Inequality lb <= f(x) <= ub

 --    MPL_FX           f(x)  =  lb    Equality f(x) = lb

 --

 -- where f(x) is the corresponding linear form of the i-th row.

 --

 -- If the row has no lower bound, *lb is set to zero; if the row has

 -- no upper bound, *ub is set to zero; and if the row is of fixed type,

 -- both *lb and *ub are set to the same value.

 --

 -- *Returns*

 --

 -- The routine returns the type of the i-th row as it is stated in the

 -- table above. */

 int mpl_get_row_bnds(MPL *mpl, int i, double *_lb, double *_ub)

 {     ELEMCON *con;

       int type;

       double lb, ub;

       if (mpl->phase != 3)

          xfault("mpl_get_row_bnds: invalid call sequence\n");

       if (!(1 <= i && i <= mpl->m))

          xfault("mpl_get_row_bnds: i = %d; row number out of range\n",

             i);

       con = mpl->row[i];

 #if 0 /* 21/VII-2006 */

       if (con->con->lbnd == NULL && con->con->ubnd == NULL)

          type = MPL_FR, lb = ub = 0.0;

       else if (con->con->ubnd == NULL)

          type = MPL_LO, lb = con->lbnd, ub = 0.0;

       else if (con->con->lbnd == NULL)

          type = MPL_UP, lb = 0.0, ub = con->ubnd;

       else if (con->con->lbnd != con->con->ubnd)

          type = MPL_DB, lb = con->lbnd, ub = con->ubnd;

       else

          type = MPL_FX, lb = ub = con->lbnd;

 #else

       lb = (con->con->lbnd == NULL ? -DBL_MAX : con->lbnd);

       ub = (con->con->ubnd == NULL ? +DBL_MAX : con->ubnd);

       if (lb == -DBL_MAX && ub == +DBL_MAX)

          type = MPL_FR, lb = ub = 0.0;

       else if (ub == +DBL_MAX)

          type = MPL_LO, ub = 0.0;

       else if (lb == -DBL_MAX)

          type = MPL_UP, lb = 0.0;

       else if (con->con->lbnd != con->con->ubnd)

          type = MPL_DB;

       else

          type = MPL_FX;

 #endif

       if (_lb != NULL) *_lb = lb;

       if (_ub != NULL) *_ub = ub;

       return type;

 }

 /*----------------------------------------------------------------------

 -- mpl_get_mat_row - obtain row of the constraint matrix.

 --

 -- *Synopsis*

 --

 -- #include "glpmpl.h"

 -- int mpl_get_mat_row(MPL *mpl, int i, int ndx[], double val[]);

 --

 -- *Description*

 --

 -- The routine mpl_get_mat_row stores column indices and numeric values

 -- of constraint coefficients for the i-th row to locations ndx[1], ...,

 -- ndx[len] and val[1], ..., val[len], respectively, where 0 <= len <= n

 -- is number of (structural) non-zero constraint coefficients, and n is

 -- number of columns in the problem.

 --

 -- If the parameter ndx is NULL, column indices are not stored. If the

 -- parameter val is NULL, numeric values are not stored.

 --

 -- Note that free rows may have constant terms, which are not part of

 -- the constraint matrix and therefore not reported by this routine. The

 -- constant term of a particular row can be obtained, if necessary, via

 -- the routine mpl_get_row_c0.

 --

 -- *Returns*

 --

 -- The routine mpl_get_mat_row returns len, which is length of i-th row

 -- of the constraint matrix (i.e. number of non-zero coefficients). */

 int mpl_get_mat_row(MPL *mpl, int i, int ndx[], double val[])

 {     FORMULA *term;

       int len = 0;

       if (mpl->phase != 3)

          xfault("mpl_get_mat_row: invalid call sequence\n");

       if (!(1 <= i && i <= mpl->m))

          xfault("mpl_get_mat_row: i = %d; row number out of range\n",

             i);

       for (term = mpl->row[i]->form; term != NULL; term = term->next)

       {  xassert(term->var != NULL);

          len++;

          xassert(len <= mpl->n);

          if (ndx != NULL) ndx[len] = term->var->j;

          if (val != NULL) val[len] = term->coef;

       }

       return len;

 }

 /*----------------------------------------------------------------------

 -- mpl_get_row_c0 - obtain constant term of free row.

 --

 -- *Synopsis*

 --

 -- #include "glpmpl.h"

 -- double mpl_get_row_c0(MPL *mpl, int i);

 --

 -- *Returns*

 --

 -- The routine mpl_get_row_c0 returns numeric value of constant term of

 -- i-th row.

 --

 -- Note that only free rows may have non-zero constant terms. Therefore

 -- if i-th row is not free, the routine returns zero. */

 double mpl_get_row_c0(MPL *mpl, int i)

 {     ELEMCON *con;

       double c0;

       if (mpl->phase != 3)

          xfault("mpl_get_row_c0: invalid call sequence\n");

       if (!(1 <= i && i <= mpl->m))

          xfault("mpl_get_row_c0: i = %d; row number out of range\n",

             i);

       con = mpl->row[i];

       if (con->con->lbnd == NULL && con->con->ubnd == NULL)

          c0 = - con->lbnd;

       else

          c0 = 0.0;

       return c0;

 }

 /*----------------------------------------------------------------------

 -- mpl_get_col_name - obtain column name.

 --

 -- *Synopsis*

 --

 -- #include "glpmpl.h"

 -- char *mpl_get_col_name(MPL *mpl, int j);

 --

 -- *Returns*

 --

 -- The routine mpl_get_col_name returns a pointer to internal buffer,

 -- which contains symbolic name of j-th column of the problem. */

 char *mpl_get_col_name(MPL *mpl, int j)

 {     char *name = mpl->mpl_buf, *t;

       int len;

       if (mpl->phase != 3)

          xfault("mpl_get_col_name: invalid call sequence\n");

       if (!(1 <= j && j <= mpl->n))

          xfault("mpl_get_col_name: j = %d; column number out of range\n"

             , j);

       strcpy(name, mpl->col[j]->var->name);

       len = strlen(name);

       xassert(len <= 255);

       t = format_tuple(mpl, '[', mpl->col[j]->memb->tuple);

       while (*t)

       {  if (len == 255) break;

          name[len++] = *t++;

       }

       name[len] = '\0';

       if (len == 255) strcpy(name+252, "...");

       xassert(strlen(name) <= 255);

       return name;

 }

 /*----------------------------------------------------------------------

 -- mpl_get_col_kind - determine column kind.

 --

 -- *Synopsis*

 --

 -- #include "glpmpl.h"

 -- int mpl_get_col_kind(MPL *mpl, int j);

 --

 -- *Returns*

 --

 -- The routine mpl_get_col_kind returns the kind of j-th column, which

 -- can be one of the following:

 --

 -- MPL_NUM - continuous variable;

 -- MPL_INT - integer variable;

 -- MPL_BIN - binary variable.

 --

 -- Note that column kinds are defined independently on type and bounds

 -- (reported by the routine mpl_get_col_bnds) of corresponding columns.