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# -*- tcl -*-
#
# Copyright (c) 2009 by Andreas Kupries <andreas_kupries@users.sourceforge.net>
# # ## ### ##### ######## ############# #####################
## Package description
## Implementation of the PackRat Machine (PARAM), a virtual machine on
## top of which parsers for Parsing Expression Grammars (PEGs) can be
## realized. This implementation is written in C, for parsers written in
## Tcl. As such the parsers themselves are tied to Tcl for control flow.
#
## RD stands for Recursive Descent.
# # ## ### ##### ######## ############# #####################
## Requisites
package require Tcl 8.4
package require critcl
# @sak notprovided pt_rde_critcl
package provide pt_rde_critcl 1.3.1
# # ## ### ##### ######## ############# #####################
## Implementation
namespace eval ::pt {
# # ## ### ##### ######## ############# #####################
## Supporting code for the main command.
catch {
#critcl::cheaders -g
#critcl::debug memory symbols
}
critcl::cheaders rde_critcl/*.h
critcl::csources rde_critcl/*.c
critcl::ccode {
/* -*- c -*- */
#include <util.h> /* Allocation macros */
#include <p.h> /* Public state API */
#include <ms.h> /* Instance command */
/* .................................................. */
/* Global PARAM management, per interp
*/
typedef struct PARAMg {
long int counter;
char buf [50];
} PARAMg;
static void
PARAMgRelease (ClientData cd, Tcl_Interp* interp)
{
ckfree((char*) cd);
}
static CONST char*
PARAMnewName (Tcl_Interp* interp)
{
#define KEY "tcllib/pt::rde/critcl"
Tcl_InterpDeleteProc* proc = PARAMgRelease;
PARAMg* paramg;
paramg = Tcl_GetAssocData (interp, KEY, &proc);
if (paramg == NULL) {
paramg = (PARAMg*) ckalloc (sizeof (PARAMg));
paramg->counter = 0;
Tcl_SetAssocData (interp, KEY, proc,
(ClientData) paramg);
}
paramg->counter ++;
sprintf (paramg->buf, "rde%d", paramg->counter);
return paramg->buf;
#undef KEY
}
static void
PARAMdeleteCmd (ClientData clientData)
{
/* Release the whole PARAM. */
param_delete ((RDE_STATE) clientData);
}
}
# # ## ### ##### ######## ############# #####################
## Main command, PARAM creation.
critcl::ccommand rde_critcl {dummy interp objc objv} {
/* Syntax: No arguments beyond the name
*/
CONST char* name;
RDE_STATE param;
Tcl_Obj* fqn;
Tcl_CmdInfo ci;
Tcl_Command c;
#define USAGE "?name?"
if ((objc != 2) && (objc != 1)) {
Tcl_WrongNumArgs (interp, 1, objv, USAGE);
return TCL_ERROR;
}
if (objc < 2) {
name = PARAMnewName (interp);
} else {
name = Tcl_GetString (objv [1]);
}
if (!Tcl_StringMatch (name, "::*")) {
/* Relative name. Prefix with current namespace */
Tcl_Eval (interp, "namespace current");
fqn = Tcl_GetObjResult (interp);
fqn = Tcl_DuplicateObj (fqn);
Tcl_IncrRefCount (fqn);
if (!Tcl_StringMatch (Tcl_GetString (fqn), "::")) {
Tcl_AppendToObj (fqn, "::", -1);
}
Tcl_AppendToObj (fqn, name, -1);
} else {
fqn = Tcl_NewStringObj (name, -1);
Tcl_IncrRefCount (fqn);
}
Tcl_ResetResult (interp);
if (Tcl_GetCommandInfo (interp,
Tcl_GetString (fqn),
&ci)) {
Tcl_Obj* err;
err = Tcl_NewObj ();
Tcl_AppendToObj (err, "command \"", -1);
Tcl_AppendObjToObj (err, fqn);
Tcl_AppendToObj (err, "\" already exists", -1);
Tcl_DecrRefCount (fqn);
Tcl_SetObjResult (interp, err);
return TCL_ERROR;
}
param = param_new ();
c = Tcl_CreateObjCommand (interp, Tcl_GetString (fqn),
paramms_objcmd, (ClientData) param,
PARAMdeleteCmd);
param_setcmd (param, c);
Tcl_SetObjResult (interp, fqn);
Tcl_DecrRefCount (fqn);
return TCL_OK;
}
}
# # ## ### ##### ######## ############# #####################
## Ready
package provide pt::rde::critcl 1
return
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