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7.3 mglParse class

Class for parsing and executing MGL script. This class is defined in #include <mgl2/mgl.h>.

The main function of mglParse class is Execute(). Exactly this function parses and executes the script string-by-string. Also there are subservient functions for the finding and creation of a variable (object derived from mglData class, see MGL variables). These functions can be useful for displaying values of variables (arrays) in some external object (like, window) or for providing access to internal data. Function AllowSetSize() allows one to prevent changing the size of the picture inside the script (forbids the MGL command setsize).

Constructor on mglParse: mglParse (bool setsize=false)
Constructor on mglParse: mglParse (HMPR pr)
Constructor on mglParse: mglParse (mglParse &pr)
C function: HMPR mgl_create_parser ()

Constructor initializes all values with zero and set AllowSetSize value.

Destructor on mglParse: ~mglParse ()
C function: void mgl_delete_parser (HMPR p)

Destructor delete parser

Method on mglParse: HMPR Self ()

Returns the pointer to internal object of type HMPR.

Method on mglParse: void Execute (mglGraph *gr, const char *text)
Method on mglParse: void Execute (mglGraph *gr, const wchar_t *text)
C function: void mgl_parse_text (HMGL gr, HMPR p, const char *text)
C function: void mgl_parse_textw (HMGL gr, HMPR p, const wchar_t *text)

Main function in the class. Function parse and execute line-by-line MGL script in array text. Lines are separated by newline symbol ‘\n’ as usual.

Method on mglParse: void Execute (mglGraph *gr, FILE *fp, bool print=false)
C function: void mgl_parse_file (HMGL gr, HMPR p, FILE *fp, int print)

The same as previous but read script from the file fp. If print=true then all warnings and information will be printed in stdout.

Method on mglParse: int Parse (mglGraph *gr, const char *str, long pos=0)
Method on mglParse: int Parse (mglGraph *gr, const wchar_t *str, long pos=0)
C function: int mgl_parse_line (HMGL gr, HMPR p, const char *str, int pos)
C function: int mgl_parse_linew (HMGL gr, HMPR p, const wchar_t *str, int pos)

Function parses the string str and executes it by using gr as a graphics plotter. Returns the value depending on an error presence in the string str: 0 – no error, 1 – wrong command argument(s), 2 – unknown command, 3 – string is too long. Optional argument pos allows to save the string position in the document (or file) for using for|next command.

Method on mglParse: mglData Calc (const char *formula)
Method on mglParse: mglData Calc (const wchar_t *formula)
C function: HMDT mgl_parser_calc (HMPR p, const char *formula)
C function: HMDT mgl_parser_calcw (HMPR p, const wchar_t *formula)

Function parses the string formula and return resulting data array. In difference to AddVar() or FindVar(), it is usual data array which should be deleted after usage.

Method on mglParse: void AddParam (int n, const char *str)
Method on mglParse: void AddParam (int n, const wchar_t *str)
C function: void mgl_parser_add_param (HMPR p, int id, const char *val)
C function: void mgl_parser_add_paramw (HMPR p, int id, const wchar_t *val)

Function set the value of n-th parameter as string str (n=0, 1 ... ’z’-’a’+10). String str shouldn’t contain ‘$’ symbol.

Method on mglParse: mglVar * FindVar (const char *name)
Method on mglParse: mglVar * FindVar (const wchar_t *name)
C function: HMDT mgl_parser_find_var (HMPR p, const char *name)
C function: HMDT mgl_parser_find_varw (HMPR p, const wchar_t *name)

Function returns the pointer to variable with name name or zero if variable is absent. Use this function to put external data array to the script or get the data from the script. You must not delete obtained data arrays!

Method on mglParse: mglVar * AddVar (const char *name)
Method on mglParse: mglVar * AddVar (const wchar_t *name)
C function: HMDT mgl_parser_add_var (HMPR p, const char *name)
C function: HMDT mgl_parser_add_varw (HMPR p, const wchar_t *name)

Function returns the pointer to variable with name name. If variable is absent then new variable is created with name name. Use this function to put external data array to the script or get the data from the script. You must not delete obtained data arrays!

Method on mglParse (C++): void DeleteVar (const char *name)
Method on mglParse (C++): void DeleteVar (const wchar_t *name)
C function: void mgl_parser_del_var (HMPR p, const char *name)
C function: void mgl_parser_del_varw (HMPR p, const wchar_t *name)

Function delete the variable with given name.

Method on mglParse (C++): void DeleteAll ()
C function: void mgl_parser_del_all (HMPR p)

Function delete all variables in this parser.

Method on mglParse: void RestoreOnce ()
C function: void mgl_parser_restore_once (HMPR p)

Restore Once flag.

Method on mglParse: void AllowSetSize (bool a)
C function: void mgl_parser_allow_setsize (HMPR p, int a)

Allow to parse ’setsize’ command or not.

Method on mglParse: void AllowFileIO (bool a)
C function: void mgl_parser_allow_file_io (HMPR p, int a)

Allow reading/saving files or not.

Method on mglParse: void Stop ()
C function: void mgl_parser_stop (HMPR p)

Sends stop signal which terminate execution at next command.

Method on mglParse: long GetCmdNum ()
C function: long mgl_parser_cmd_num (HMPR p)

Return the number of registered MGL commands.

Method on mglParse: const char * GetCmdName (long id)
C function: const char * mgl_parser_cmd_name (HMPR p, long id)

Return the name of command with given id.

Method on mglParse: int CmdType (const char *name)
C function: int mgl_parser_cmd_type (HMPR p, const char *name)

Return the type of MGL command name. Type of commands are: 0 – not the command, 1 - data plot, 2 - other plot, 3 - setup, 4 - data handle, 5 - data create, 6 - subplot, 7 - program, 8 - 1d plot, 9 - 2d plot, 10 - 3d plot, 11 - dd plot, 12 - vector plot, 13 - axis, 14 - primitives, 15 - axis setup, 16 - text/legend, 17 - data transform.

Method on mglParse: const char * CmdFormat (const char *name)
C function: const char * mgl_parser_cmd_frmt (HMPR p, const char *name)

Return the format of arguments for MGL command name.

Method on mglParse: const char * CmdDesc (const char *name)
C function: const char * mgl_parser_cmd_desc (HMPR p, const char *name)

Return the description of MGL command name.


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