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GOP_Parser.h
Go to the documentation of this file.
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/*
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* PROPRIETARY INFORMATION. This software is proprietary to
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* Side Effects Software Inc., and is not to be reproduced,
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* transmitted, or disclosed in any way without written permission.
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*
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* COMMENTS: This is a general purpose skeleton of a parser.
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* It has facilities to provide failry straightforward parsing
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* of a "language".
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*
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* To parse a string, just instantiate the derived parser and
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* call the doIt() method.
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*
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*/
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#ifndef __GOP_Parser_h__
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#define __GOP_Parser_h__
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#include "
GOP_API.h
"
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#include <
GA/GA_Types.h
>
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#include <
UT/UT_String.h
>
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// These are the state constants that are common to all parsers.
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// Most parsers will probably want to add their own, must be
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// careful to number them uniquely.
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#define ST_START 0
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#define ST_ERROR 99
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class
GOP_API
GOP_Parser
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{
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public
:
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GOP_Parser
(
const
UT_String
&str);
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GOP_Parser
(
const
UT_StringHolder
&str);
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virtual
~GOP_Parser
() {}
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// This is the method that the user would call to start the
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// parsing. The return value can be parser-depenedent.
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// (e.g. the number of items parsed, an error value, etc...)
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// The return value should be placed in myReturnVal
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virtual
int
doIt();
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protected
:
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UT_String
myString
;
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//////////// State Handlers
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virtual
void
handleStart() = 0;
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virtual
void
handleError() = 0;
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//////////// Utility Methods
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void
startToken();
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void
endToken();
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// Each parser should override this method and use it to
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// manage state transitions. Return false if you want the
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// dispatcher to stop (e.g. when an error occurs)
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virtual
bool
dispatch(
char
c
) = 0;
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// Method that loops on the characters of the string and calls dispatch.
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// There should be no need to override this method.
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virtual
void
parseDispatcher();
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// Called during the constructor to initialize the state machine
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// before any parsing is done.
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virtual
void
init();
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// Called after the parsing is done.
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virtual
void
finish();
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// Grabs the current token, goes to 'state' and returns true if
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// successful. Otherwise goes to state ST_ERROR and returns false
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bool
getInt (
GA_Index
&retval,
unsigned
state);
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bool
getInt (
int
&retval,
unsigned
state);
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bool
getFloat(
float
&retval,
unsigned
state);
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bool
getFloat(
double
&retval,
unsigned
state);
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// Checks if the current token is the character c, (stripping out
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// all leading and trailing spaces
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bool
isChar(
char
c
);
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// We also need to count '\0' as a space
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bool
isSpace
(
char
c
) {
return
(
isspace
(c) || c ==
'\0'
); }
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//////////// State Variables
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char
*
myTokBegin
;
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char
*
myTokEnd
;
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char
*
myTokLastGood
;
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unsigned
myCurrentState
;
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int
myReturnVal
;
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//////////// Utility Variables
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char
myTempChar
;
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};
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#endif
GOP_Parser::myTokEnd
char * myTokEnd
Definition:
GOP_Parser.h:90
GOP_Parser::myTokBegin
char * myTokBegin
Definition:
GOP_Parser.h:89
GOP_API
#define GOP_API
Definition:
GOP_API.h:10
UT_String.h
UT_StringHolder
Definition:
UT_StringHolder.h:999
GOP_Parser::myCurrentState
unsigned myCurrentState
Definition:
GOP_Parser.h:92
GOP_Parser::~GOP_Parser
virtual ~GOP_Parser()
Definition:
GOP_Parser.h:35
GOP_Parser::myReturnVal
int myReturnVal
Definition:
GOP_Parser.h:93
GOP_Parser::myString
UT_String myString
Definition:
GOP_Parser.h:44
GA_Index
GA_Size GA_Index
Define the strictness of GA_Offset/GA_Index.
Definition:
GA_Types.h:640
Strutil::isspace
bool isspace(char c)
Definition:
strutil.h:799
GOP_Parser::myTokLastGood
char * myTokLastGood
Definition:
GOP_Parser.h:91
nanovdb::io::c
c
Definition:
IO.h:328
GOP_Parser
Definition:
GOP_Parser.h:30
UT_String
Definition:
UT_String.h:73
GA_Types.h
GOP_Parser::isSpace
bool isSpace(char c)
Definition:
GOP_Parser.h:84
GOP_Parser::myTempChar
char myTempChar
Definition:
GOP_Parser.h:96
GOP_API.h
GOP
GOP_Parser.h
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