reader_diff.c File Reference

Detailed Description

DIFF file reader.

Author

Jakob Witzig

Definition in file reader_diff.c.

#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <strings.h>
#include <ctype.h>
#include "scip/reader_diff.h"

Go to the source code of this file.

Macros
#define	READER_NAME   "diffreader"
#define	READER_DESC   "file reader for changes in the LP file"
#define	READER_EXTENSION   "diff"
#define	LP_MAX_LINELEN   65536
#define	LP_MAX_PUSHEDTOKENS   2
#define	LP_INIT_COEFSSIZE   8192

Typedefs
typedef enum LpSection	LPSECTION
typedef enum LpExpType	LPEXPTYPE
typedef enum LpSense	LPSENSE
typedef struct LpInput	LPINPUT

Enumerations
enum	LpSection {   LP_START,   LP_OBJECTIVE,   LP_END,   LP_START,   LP_OBJECTIVE,   LP_CONSTRAINTS,   LP_BOUNDS,   LP_GENERALS,   LP_BINARIES,   LP_SEMICONTINUOUS,   LP_SOS,   LP_END }
enum	LpExpType {   LP_EXP_NONE,   LP_EXP_UNSIGNED,   LP_EXP_SIGNED,   LP_EXP_NONE,   LP_EXP_UNSIGNED,   LP_EXP_SIGNED }
enum	LpSense {   LP_SENSE_LE,   LP_SENSE_GE,   LP_SENSE_EQ,   LP_SENSE_NOTHING,   LP_SENSE_LE,   LP_SENSE_GE,   LP_SENSE_EQ }

Functions
static void	syntaxError (SCIP *scip, LPINPUT *lpinput, const char *msg)
static SCIP_Bool	hasError (LPINPUT *lpinput)
static SCIP_Bool	isDelimChar (char c)
static SCIP_Bool	isTokenChar (char c)
static SCIP_Bool	isValueChar (char c, char nextc, SCIP_Bool firstchar, SCIP_Bool *hasdot, LPEXPTYPE *exptype)
static SCIP_Bool	getNextLine (SCIP *scip, LPINPUT *lpinput)
static void	swapPointers (char **pointer1, char **pointer2)
static SCIP_Bool	getNextToken (SCIP *scip, LPINPUT *lpinput)
static void	pushToken (LPINPUT *lpinput)
static void	pushBufferToken (LPINPUT *lpinput)
static void	swapTokenBuffer (LPINPUT *lpinput)
static SCIP_Bool	isNewSection (SCIP *scip, LPINPUT *lpinput)
static SCIP_Bool	isSign (LPINPUT *lpinput, int *sign)
static SCIP_Bool	isValue (SCIP *scip, LPINPUT *lpinput, SCIP_Real *value)
static SCIP_Bool	isSense (LPINPUT *lpinput, LPSENSE *sense)
static SCIP_RETCODE	getVariable (SCIP *scip, char *name, SCIP_VAR **var)
static SCIP_RETCODE	readStart (SCIP *scip, LPINPUT *lpinput)
static SCIP_RETCODE	readCoefficients (SCIP *scip, LPINPUT *lpinput, SCIP_Bool isobjective, char *name, SCIP_VAR ***vars, SCIP_Real **coefs, int *ncoefs, SCIP_Bool *newsection)
static SCIP_RETCODE	readObjective (SCIP *scip, LPINPUT *lpinput)
static SCIP_RETCODE	readDiffFile (SCIP *scip, LPINPUT *lpinput, const char *filename)
static	SCIP_DECL_READERCOPY (readerCopyDiff)
static	SCIP_DECL_READERFREE (readerFreeDiff)
static	SCIP_DECL_READERREAD (readerReadDiff)
SCIP_RETCODE	SCIPincludeReaderDiff (SCIP *scip)
SCIP_RETCODE	SCIPreadDiff (SCIP *scip, SCIP_READER *reader, const char *filename, SCIP_RESULT *result)

Variables
static const char	commentchars [] = "\\"

Macro Definition Documentation

#define READER_NAME   "diffreader"

Definition at line 34 of file reader_diff.c.

Referenced by SCIP_DECL_READERCOPY(), and SCIPincludeReaderDiff().

#define READER_DESC   "file reader for changes in the LP file"

Definition at line 35 of file reader_diff.c.

Referenced by SCIPincludeReaderDiff().

#define READER_EXTENSION   "diff"

Definition at line 36 of file reader_diff.c.

Referenced by SCIPincludeReaderDiff().

#define LP_MAX_LINELEN   65536

Definition at line 41 of file reader_diff.c.

Referenced by getNextLine(), getNextToken(), isNewSection(), readCoefficients(), readObjective(), and SCIPreadDiff().

#define LP_MAX_PUSHEDTOKENS   2

Definition at line 42 of file reader_diff.c.

Referenced by pushBufferToken(), pushToken(), and SCIPreadDiff().

#define LP_INIT_COEFSSIZE   8192

Definition at line 43 of file reader_diff.c.

Referenced by readCoefficients().

Typedef Documentation

typedef enum LpSection LPSECTION

Definition at line 50 of file reader_diff.c.

typedef enum LpExpType LPEXPTYPE

Definition at line 56 of file reader_diff.c.

typedef enum LpSense LPSENSE

Definition at line 62 of file reader_diff.c.

typedef struct LpInput LPINPUT

Definition at line 83 of file reader_diff.c.

Enumeration Type Documentation

enum LpSection

Section in LP File

Enumerator
LP_START
LP_OBJECTIVE
LP_END
LP_START
LP_OBJECTIVE
LP_CONSTRAINTS
LP_BOUNDS
LP_GENERALS
LP_BINARIES
LP_SEMICONTINUOUS
LP_SOS
LP_END

Definition at line 46 of file reader_diff.c.

enum LpExpType

Enumerator
LP_EXP_NONE
LP_EXP_UNSIGNED
LP_EXP_SIGNED
LP_EXP_NONE
LP_EXP_UNSIGNED
LP_EXP_SIGNED

Definition at line 52 of file reader_diff.c.

enum LpSense

Enumerator
LP_SENSE_LE
LP_SENSE_GE
LP_SENSE_EQ
LP_SENSE_NOTHING
LP_SENSE_LE
LP_SENSE_GE
LP_SENSE_EQ

Definition at line 58 of file reader_diff.c.

Function Documentation

static void syntaxError ( SCIP *  scip, LPINPUT *  lpinput, const char *  msg  )

static

issues an error message and marks the LP data to have errors

Parameters

scip	SCIP data structure
lpinput	LP reading data
msg	error message

Definition at line 94 of file reader_diff.c.

References LP_END, NULL, SCIP_VERBLEVEL_MINIMAL, SCIPerrorMessage, SCIPsnprintf(), SCIPverbMessage(), and TRUE.

Referenced by readCoefficients().

static SCIP_Bool hasError ( LPINPUT *  lpinput )

static

returns whether a syntax error was detected

Parameters

lpinput

LP reading data

Definition at line 121 of file reader_diff.c.

References NULL.

Referenced by readDiffFile(), and readObjective().

static SCIP_Bool isDelimChar ( char  c )

static

returns whether the given character is a token delimiter

Parameters

c	input character

Definition at line 132 of file reader_diff.c.

References FALSE, and TRUE.

Referenced by getNextToken().

static SCIP_Bool isTokenChar ( char  c )

static

returns whether the given character is a single token

Parameters

c	input character

Definition at line 153 of file reader_diff.c.

References FALSE, and TRUE.

Referenced by getNextToken().

static SCIP_Bool isValueChar ( char  c, char  nextc, SCIP_Bool  firstchar, SCIP_Bool *  hasdot, LPEXPTYPE *  exptype  )

static

returns whether the current character is member of a value string

Parameters

c	input character
nextc	next input character
firstchar	is the given character the first char of the token?
hasdot	pointer to update the dot flag
exptype	pointer to update the exponent type

Definition at line 177 of file reader_diff.c.

References FALSE, LP_EXP_NONE, LP_EXP_SIGNED, LP_EXP_UNSIGNED, NULL, and TRUE.

Referenced by getNextToken().

static SCIP_Bool getNextLine ( SCIP *  scip, LPINPUT *  lpinput  )

static

reads the next line from the input file into the line buffer; skips comments; returns whether a line could be read

Parameters

scip	SCIP data structure
lpinput	LP reading data

Definition at line 221 of file reader_diff.c.

References BMSclearMemoryArray, commentchars, FALSE, LP_MAX_LINELEN, NULL, SCIPdebugMessage, SCIPfgets(), SCIPfseek(), SCIPwarningMessage(), and TRUE.

Referenced by getNextToken().

static void swapPointers ( char **  pointer1, char **  pointer2  )

static

swaps the addresses of two pointers

Parameters

pointer1	first pointer
pointer2	second pointer

Definition at line 312 of file reader_diff.c.

Referenced by getNextToken(), pushBufferToken(), pushToken(), and swapTokenBuffer().

static SCIP_Bool getNextToken ( SCIP *  scip, LPINPUT *  lpinput  )

static

reads the next token from the input file into the token buffer; returns whether a token was read

Parameters

scip	SCIP data structure
lpinput	LP reading data

Definition at line 326 of file reader_diff.c.

References FALSE, getNextLine(), isDelimChar(), isTokenChar(), isValueChar(), LP_END, LP_EXP_NONE, LP_MAX_LINELEN, NULL, SCIP_Bool, SCIPdebugMessage, swapPointers(), and TRUE.

Referenced by isNewSection(), readCoefficients(), and readStart().

static void pushToken ( LPINPUT *  lpinput )

static

puts the current token on the token stack, such that it is read at the next call to getNextToken()

Parameters

lpinput

LP reading data

Definition at line 431 of file reader_diff.c.

References LP_MAX_PUSHEDTOKENS, NULL, and swapPointers().

Referenced by isNewSection(), and readCoefficients().

static void pushBufferToken ( LPINPUT *  lpinput )

static

puts the buffered token on the token stack, such that it is read at the next call to getNextToken()

Parameters

lpinput

LP reading data

Definition at line 444 of file reader_diff.c.

References LP_MAX_PUSHEDTOKENS, NULL, and swapPointers().

Referenced by readCoefficients().

static void swapTokenBuffer ( LPINPUT *  lpinput )

static

swaps the current token with the token buffer

Parameters

lpinput

LP reading data

Definition at line 457 of file reader_diff.c.

References NULL, and swapPointers().

Referenced by isNewSection(), and readCoefficients().

static SCIP_Bool isNewSection ( SCIP *  scip, LPINPUT *  lpinput  )

static

checks whether the current token is a section identifier, and if yes, switches to the corresponding section

Parameters

scip	SCIP data structure
lpinput	LP reading data

Definition at line 468 of file reader_diff.c.

References FALSE, getNextToken(), LP_END, LP_MAX_LINELEN, LP_OBJECTIVE, NULL, pushToken(), SCIP_Bool, SCIP_OBJSENSE_MAXIMIZE, SCIP_OBJSENSE_MINIMIZE, SCIPdebugMessage, swapTokenBuffer(), and TRUE.

Referenced by readCoefficients(), and readStart().

static SCIP_Bool isSign ( LPINPUT *  lpinput, int *  sign  )

static

returns whether the current token is a sign

Parameters

lpinput	LP reading data
sign	pointer to update the sign

Definition at line 546 of file reader_diff.c.

References FALSE, NULL, and TRUE.

Referenced by readCoefficients().

static SCIP_Bool isValue ( SCIP *  scip, LPINPUT *  lpinput, SCIP_Real *  value  )

static

returns whether the current token is a value

Parameters

scip	SCIP data structure
lpinput	LP reading data
value	pointer to store the value (unchanged, if token is no value)

Definition at line 571 of file reader_diff.c.

References FALSE, NULL, SCIPinfinity(), and TRUE.

Referenced by readCoefficients().

static SCIP_Bool isSense ( LPINPUT *  lpinput, LPSENSE *  sense  )

static

returns whether the current token is an equation sense

Parameters

lpinput	LP reading data
sense	pointer to store the equation sense, or NULL

Definition at line 603 of file reader_diff.c.

References FALSE, LP_SENSE_EQ, LP_SENSE_GE, LP_SENSE_LE, NULL, and TRUE.

Referenced by readCoefficients().

static SCIP_RETCODE getVariable ( SCIP *  scip, char *  name, SCIP_VAR **  var  )

static

returns the variable with the given name, or creates a new variable if it does not exist

Parameters

scip	SCIP data structure
name	name of the variable
var	pointer to store the variable

Definition at line 634 of file reader_diff.c.

References NULL, SCIP_OKAY, SCIP_READERROR, and SCIPfindVar().

Referenced by readCoefficients().

static SCIP_RETCODE readStart ( SCIP *  scip, LPINPUT *  lpinput  )

static

reads the header of the file

Parameters

scip	SCIP data structure
lpinput	LP reading data

Definition at line 653 of file reader_diff.c.

References getNextToken(), isNewSection(), NULL, and SCIP_OKAY.

Referenced by readDiffFile().

static SCIP_RETCODE readCoefficients ( SCIP *  scip, LPINPUT *  lpinput, SCIP_Bool  isobjective, char *  name, SCIP_VAR ***  vars, SCIP_Real **  coefs, int *  ncoefs, SCIP_Bool *  newsection  )

static

reads an objective or constraint with name and coefficients

Parameters

scip	SCIP data structure
lpinput	LP reading data
isobjective	indicates whether we are currently reading the coefficients of the objective
name	pointer to store the name of the line; must be at least of size LP_MAX_LINELEN
vars	pointer to store the array with variables (must be freed by caller)
coefs	pointer to store the array with coefficients (must be freed by caller)
ncoefs	pointer to store the number of coefficients
newsection	pointer to store whether a new section was encountered

Definition at line 674 of file reader_diff.c.

References FALSE, getNextToken(), getVariable(), isNewSection(), isSense(), isSign(), isValue(), LP_INIT_COEFSSIZE, LP_MAX_LINELEN, MAX, NULL, pushBufferToken(), pushToken(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_READERROR, SCIP_Real, SCIPallocMemoryArray, SCIPdebugMessage, SCIPisZero(), SCIPmemccpy(), SCIPreallocMemoryArray, SCIPvarGetName(), SCIPwarningMessage(), swapTokenBuffer(), syntaxError(), and TRUE.

Referenced by readObjective().

static SCIP_RETCODE readObjective ( SCIP *  scip, LPINPUT *  lpinput  )

static

reads the objective section

Parameters

scip	SCIP data structure
lpinput	LP reading data

Definition at line 869 of file reader_diff.c.

References hasError(), LP_MAX_LINELEN, NULL, readCoefficients(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPchgVarObj(), SCIPfreeMemoryArrayNull, SCIPgetNVars(), SCIPgetVars(), and TRUE.

Referenced by readDiffFile().

static SCIP_RETCODE readDiffFile ( SCIP *  scip, LPINPUT *  lpinput, const char *  filename  )

static

reads a diff file

Parameters

scip	SCIP data structure
lpinput	LP reading data
filename	name of the input file

Definition at line 912 of file reader_diff.c.

References hasError(), LP_END, LP_OBJECTIVE, LP_START, NULL, readObjective(), readStart(), SCIP_CALL, SCIP_INVALIDDATA, SCIP_NOFILE, SCIP_OKAY, SCIP_STAGE_PROBLEM, SCIPerrorMessage, SCIPfclose(), SCIPfopen(), SCIPfreeTransform(), SCIPgetStage(), and SCIPprintSysError().

Referenced by SCIPreadDiff().

static SCIP_DECL_READERCOPY ( readerCopyDiff  )

static

copy method for reader plugins (called when SCIP copies plugins)

Definition at line 968 of file reader_diff.c.

References NULL, READER_NAME, SCIP_CALL, SCIP_OKAY, SCIPincludeReaderDiff(), and SCIPreaderGetName().

static SCIP_DECL_READERFREE ( readerFreeDiff  )

static

destructor of reader to free user data (called when SCIP is exiting)

Definition at line 982 of file reader_diff.c.

References SCIP_OKAY.

static SCIP_DECL_READERREAD ( readerReadDiff  )

static

problem reading method of reader

Definition at line 989 of file reader_diff.c.

References SCIP_CALL, SCIP_OKAY, and SCIPreadDiff().

SCIP_RETCODE SCIPincludeReaderDiff

(

SCIP *

scip

)

includes the lp file reader in SCIP

Parameters

scip	SCIP data structure

Definition at line 1002 of file reader_diff.c.

References NULL, READER_DESC, READER_EXTENSION, READER_NAME, SCIP_CALL, SCIP_OKAY, SCIPincludeReaderBasic(), SCIPsetReaderCopy(), SCIPsetReaderFree(), and SCIPsetReaderRead().

Referenced by SCIP_DECL_READERCOPY(), and SCIPincludeDefaultPlugins().

SCIP_RETCODE SCIPreadDiff	(	SCIP *	scip,
		SCIP_READER *	reader,
		const char *	filename,
		SCIP_RESULT *	result
	)

reads problem from file

Parameters

scip	SCIP data structure
reader	the file reader itself
filename	full path and name of file to read, or NULL if stdin should be used
result	pointer to store the result of the file reading call

Definition at line 1022 of file reader_diff.c.

References FALSE, LP_MAX_LINELEN, LP_MAX_PUSHEDTOKENS, LP_START, NULL, readDiffFile(), SCIP_CALL, SCIP_OBJSENSE_MINIMIZE, SCIP_OKAY, SCIP_READERROR, SCIP_SUCCESS, SCIPallocMemoryArray, SCIPfreeMemoryArray, and SCIPsetObjsense().

Referenced by SCIP_DECL_READERREAD().

Variable Documentation

const char commentchars[] = "\\"

static

Definition at line 85 of file reader_diff.c.

Referenced by getNextLine().