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/*
* Copyright 2006-2012 Adrian Thurston <thurston@complang.org>
*/
#include "pcheck.h"
#include <assert.h>
/* Construct a new parameter checker with for paramSpec. */
ParamCheck::ParamCheck( const char *paramSpec, int argc, const char **argv )
:
state(noparam),
argOffset(0),
curArg(0),
iCurArg(1),
paramSpec(paramSpec),
argc(argc),
argv(argv)
{
}
/* Check a single option. Returns the index of the next parameter. Sets p to
* the arg character if valid, 0 otherwise. Sets parg to the parameter arg if
* there is one, NULL otherwise. */
bool ParamCheck::check()
{
bool requiresParam;
if ( iCurArg >= argc ) { /* Off the end of the arg list. */
state = noparam;
return false;
}
if ( argOffset != 0 && *argOffset == 0 ) {
/* We are at the end of an arg string. */
iCurArg += 1;
if ( iCurArg >= argc ) {
state = noparam;
return false;
}
argOffset = 0;
}
if ( argOffset == 0 ) {
/* Set the current arg. */
curArg = argv[iCurArg];
/* We are at the beginning of an arg string. */
if ( argv[iCurArg] == 0 || /* Argv[iCurArg] is null. */
argv[iCurArg][0] != '-' || /* Not a param. */
argv[iCurArg][1] == 0 ) { /* Only a dash. */
parameter = 0;
parameterArg = 0;
iCurArg += 1;
state = noparam;
return true;
}
argOffset = argv[iCurArg] + 1;
}
/* Get the arg char. */
char argChar = *argOffset;
/* Loop over all the parms and look for a match. */
const char *pSpec = paramSpec;
while ( *pSpec != 0 ) {
char pSpecChar = *pSpec;
/* If there is a ':' following the char then
* it requires a parm. If a parm is required
* then move ahead two in the parmspec. Otherwise
* move ahead one in the parm spec. */
if ( pSpec[1] == ':' ) {
requiresParam = true;
pSpec += 2;
}
else {
requiresParam = false;
pSpec += 1;
}
/* Do we have a match. */
if ( argChar == pSpecChar ) {
if ( requiresParam ) {
if ( argOffset[1] == 0 ) {
/* The param must follow. */
if ( iCurArg + 1 == argc ) {
/* We are the last arg so there
* cannot be a parameter to it. */
parameter = argChar;
parameterArg = 0;
iCurArg += 1;
argOffset = 0;
state = invalid;
return true;
}
else {
/* the parameter to the arg is the next arg. */
parameter = pSpecChar;
parameterArg = argv[iCurArg + 1];
iCurArg += 2;
argOffset = 0;
state = match;
return true;
}
}
else {
/* The param for the arg is built in. */
parameter = pSpecChar;
parameterArg = argOffset + 1;
iCurArg += 1;
argOffset = 0;
state = match;
return true;
}
}
else {
/* Good, we matched the parm and no
* arg is required. */
parameter = pSpecChar;
parameterArg = 0;
argOffset += 1;
state = match;
return true;
}
}
}
/* We did not find a match. Bad Argument. */
parameter = argChar;
parameterArg = 0;
argOffset += 1;
state = invalid;
return true;
}
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