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Full Discussion: Tokenization
Top Forums Programming Tokenization Post 302136966 by porter on Thursday 20th of September 2007 06:41:02 PM
Old 09-20-2007
Originally Posted by noobie
and i'm guessing that result holds the value of the current token.. right?
My understanding is the token is a string, not a number, switch() takes a number.

Personally I would not do it like that.... Smilie

I would have a loop what reads a logical line and splits it up into basically an argc/argv type array. Then check argv[0] and match it in a table, if it's in the table, the table will have a function pointer to a handler, if not then just fork/exec and the argc/argv is already setup.

When you want to add macro expansion etc, just plonk that in the logical read line.
XrmInitialize(3)						  XLIB FUNCTIONS						  XrmInitialize(3)

XrmInitialize, XrmParseCommand, XrmValue, XrmOptionKind, XrmOptionDescRec - initialize the Resource Manager, Resource Manager structures, and parse the command line SYNTAX
void XrmInitialize(void); void XrmParseCommand(XrmDatabase *database, XrmOptionDescList table, int table_count, char *name, int *argc_in_out, char **argv_in_out); ARGUMENTS
argc_in_out Specifies the number of arguments and returns the number of remaining arguments. argv_in_out Specifies the command line arguments and returns the remaining arguments. database Specifies the resource database. name Specifies the application name. table Specifies the table of command line arguments to be parsed. table_count Specifies the number of entries in the table. DESCRIPTION
The XrmInitialize function initialize the resource manager. It must be called before any other Xrm functions are used. The XrmParseCommand function parses an (argc, argv) pair according to the specified option table, loads recognized options into the speci- fied database with type ``String,'' and modifies the (argc, argv) pair to remove all recognized options. If database contains NULL, Xrm- ParseCommand creates a new database and returns a pointer to it. Otherwise, entries are added to the database specified. If a database is created, it is created in the current locale. The specified table is used to parse the command line. Recognized options in the table are removed from argv, and entries are added to the specified resource database in the order they occur in argv. The table entries contain information on the option string, the option name, the style of option, and a value to provide if the option kind is XrmoptionNoArg. The option names are compared byte-for-byte to arguments in argv, independent of any locale. The resource values given in the table are stored in the resource database without modification. All resource database entries are created using a ``String'' representation type. The argc argument specifies the number of arguments in argv and is set on return to the remaining number of arguments that were not parsed. The name argument should be the name of your application for use in building the database entry. The name argument is prefixed to the resourceName in the option table before storing a database entry. The name argument is treated as a single component, even if it has embedded periods. No separating (binding) character is inserted, so the table must contain either a period (.) or an asterisk (*) as the first character in each resourceName entry. To specify a more completely qualified resource name, the resourceName entry can contain multiple components. If the name argument and the resource- Names are not in the Host Portable Character Encoding, the result is implementation-dependent. STRUCTURES
The XrmValue, XrmOptionKind, and XrmOptionDescRec structures contain: typedef struct { unsigned int size; XPointer addr; } XrmValue, *XrmValuePtr; typedef enum { XrmoptionNoArg, /* Value is specified in XrmOptionDescRec.value */ XrmoptionIsArg, /* Value is the option string itself */ XrmoptionStickyArg, /* Value is characters immediately following option */ XrmoptionSepArg, /* Value is next argument in argv */ XrmoptionResArg, /* Resource and value in next argument in argv */ XrmoptionSkipArg, /* Ignore this option and the next argument in argv */ XrmoptionSkipLine, /* Ignore this option and the rest of argv */ XrmoptionSkipNArgs /* Ignore this option and the next XrmOptionDescRec.value arguments in argv */ } XrmOptionKind; typedef struct { char *option; /* Option specification string in argv */ char *specifier; /* Binding and resource name (sans application name) */ XrmOptionKind argKind;/* Which style of option it is */ XPointer value; /* Value to provide if XrmoptionNoArg or XrmoptionSkipNArgs */ } XrmOptionDescRec, *XrmOptionDescList; SEE ALSO
XrmGetResource(3), XrmMergeDatabases(3), XrmPutResource(3), XrmUniqueQuark(3) Xlib - C Language X Interface X Version 11 libX11 1.3.2 XrmInitialize(3)
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