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initial check-in of the new version (CVS 1)

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FossilOrigin-Name: 6f3655f79f9b6fc9fb7baaa10a7e0f2b6a512dfa
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drh
2000-05-29 14:26:00 +00:00
parent ce0da46e61
commit 75897234be
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tool/lempar.c Normal file
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/* Driver template for the LEMON parser generator.
** Copyright 1991-1995 by D. Richard Hipp.
*
* This version is specially modified for use with sqlite.
* @(#) $Id: lempar.c,v 1.1 2000/05/29 14:26:02 drh Exp $
*
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Library General Public
** License as published by the Free Software Foundation; either
** version 2 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Library General Public License for more details.
**
** You should have received a copy of the GNU Library General Public
** License along with this library; if not, write to the
** Free Software Foundation, Inc., 59 Temple Place - Suite 330,
** Boston, MA 02111-1307, USA.
**
** Modified 1997 to make it suitable for use with makeheaders.
*/
/* First off, code is include which follows the "include" declaration
** in the input file. */
#include <stdio.h>
%%
/* Next is all token values, in a form suitable for use by makeheaders.
** This section will be null unless lemon is run with the -m switch.
*/
/*
** These constants (all generated automatically by the parser generator)
** specify the various kinds of tokens (terminals) that the parser
** understands.
**
** Each symbol here is a terminal symbol in the grammar.
*/
%%
/* Make sure the INTERFACE macro is defined.
*/
#ifndef INTERFACE
# define INTERFACE 1
#endif
/* The next thing included is series of defines which control
** various aspects of the generated parser.
** YYCODETYPE is the data type used for storing terminal
** and nonterminal numbers. "unsigned char" is
** used if there are fewer than 250 terminals
** and nonterminals. "int" is used otherwise.
** YYNOCODE is a number of type YYCODETYPE which corresponds
** to no legal terminal or nonterminal number. This
** number is used to fill in empty slots of the hash
** table.
** YYACTIONTYPE is the data type used for storing terminal
** and nonterminal numbers. "unsigned char" is
** used if there are fewer than 250 rules and
** states combined. "int" is used otherwise.
** ParseTOKENTYPE is the data type used for minor tokens given
** directly to the parser from the tokenizer.
** YYMINORTYPE is the data type used for all minor tokens.
** This is typically a union of many types, one of
** which is ParseTOKENTYPE. The entry in the union
** for base tokens is called "yy0".
** YYSTACKDEPTH is the maximum depth of the parser's stack.
** ParseARGDECL is a declaration of a 3rd argument to the
** parser, or null if there is no extra argument.
** ParseKRARGDECL A version of ParseARGDECL for K&R C.
** ParseANSIARGDECL A version of ParseARGDECL for ANSI C.
** YYNSTATE the combined number of states.
** YYNRULE the number of rules in the grammar
** YYERRORSYMBOL is the code number of the error symbol. If not
** defined, then do no error processing.
*/
%%
#define YY_NO_ACTION (YYNSTATE+YYNRULE+2)
#define YY_ACCEPT_ACTION (YYNSTATE+YYNRULE+1)
#define YY_ERROR_ACTION (YYNSTATE+YYNRULE)
/* Next is the action table. Each entry in this table contains
**
** + An integer which is the number representing the look-ahead
** token
**
** + An integer indicating what action to take. Number (N) between
** 0 and YYNSTATE-1 mean shift the look-ahead and go to state N.
** Numbers between YYNSTATE and YYNSTATE+YYNRULE-1 mean reduce by
** rule N-YYNSTATE. Number YYNSTATE+YYNRULE means that a syntax
** error has occurred. Number YYNSTATE+YYNRULE+1 means the parser
** accepts its input.
**
** + A pointer to the next entry with the same hash value.
**
** The action table is really a series of hash tables. Each hash
** table contains a number of entries which is a power of two. The
** "state" table (which follows) contains information about the starting
** point and size of each hash table.
*/
struct yyActionEntry {
YYCODETYPE lookahead; /* The value of the look-ahead token */
YYACTIONTYPE action; /* Action to take for this look-ahead */
struct yyActionEntry *next; /* Next look-ahead with the same hash, or NULL */
};
static struct yyActionEntry yyActionTable[] = {
%%
};
/* The state table contains information needed to look up the correct
** action in the action table, given the current state of the parser.
** Information needed includes:
**
** + A pointer to the start of the action hash table in yyActionTable.
**
** + A mask used to hash the look-ahead token. The mask is an integer
** which is one less than the size of the hash table.
**
** + The default action. This is the action to take if no entry for
** the given look-ahead is found in the action hash table.
*/
struct yyStateEntry {
struct yyActionEntry *hashtbl; /* Start of the hash table in yyActionTable */
int mask; /* Mask used for hashing the look-ahead */
YYACTIONTYPE actionDefault; /* Default action if look-ahead not found */
};
static struct yyStateEntry yyStateTable[] = {
%%
};
/* The following structure represents a single element of the
** parser's stack. Information stored includes:
**
** + The state number for the parser at this level of the stack.
**
** + The value of the token stored at this level of the stack.
** (In other words, the "major" token.)
**
** + The semantic value stored at this level of the stack. This is
** the information used by the action routines in the grammar.
** It is sometimes called the "minor" token.
*/
struct yyStackEntry {
int stateno; /* The state-number */
int major; /* The major token value. This is the code
** number for the token at this stack level */
YYMINORTYPE minor; /* The user-supplied minor token value. This
** is the value of the token */
};
/* The state of the parser is completely contained in an instance of
** the following structure */
struct yyParser {
int idx; /* Index of top element in stack */
int errcnt; /* Shifts left before out of the error */
struct yyStackEntry *top; /* Pointer to the top stack element */
struct yyStackEntry stack[YYSTACKDEPTH]; /* The parser's stack */
};
typedef struct yyParser yyParser;
#ifndef NDEBUG
#include <stdio.h>
static FILE *yyTraceFILE = 0;
static char *yyTracePrompt = 0;
/*
** Turn parser tracing on by giving a stream to which to write the trace
** and a prompt to preface each trace message. Tracing is turned off
** by making either argument NULL
**
** Inputs:
** <ul>
** <li> A FILE* to which trace output should be written.
** If NULL, then tracing is turned off.
** <li> A prefix string written at the beginning of every
** line of trace output. If NULL, then tracing is
** turned off.
** </ul>
**
** Outputs:
** None.
*/
/* SQLITE MODIFICATION: Give the function file scope */
void ParseTrace(FILE *TraceFILE, char *zTracePrompt){
yyTraceFILE = TraceFILE;
yyTracePrompt = zTracePrompt;
if( yyTraceFILE==0 ) yyTracePrompt = 0;
else if( yyTracePrompt==0 ) yyTraceFILE = 0;
}
/* For tracing shifts, the names of all terminals and nonterminals
** are required. The following table supplies these names */
static char *yyTokenName[] = {
%%
};
#define YYTRACE(X) if( yyTraceFILE ) fprintf(yyTraceFILE,"%sReduce [%s].\n",yyTracePrompt,X);
#else
#define YYTRACE(X)
#endif
/*
** This function allocates a new parser.
** The only argument is a pointer to a function which works like
** malloc.
**
** Inputs:
** A pointer to the function used to allocate memory.
**
** Outputs:
** A pointer to a parser. This pointer is used in subsequent calls
** to Parse and ParseFree.
*/
/* SQLITE MODIFICATION: Give the function file scope */
void *ParseAlloc(void *(*mallocProc)()){
yyParser *pParser;
pParser = (yyParser*)(*mallocProc)( sizeof(yyParser), __FILE__, __LINE__ );
if( pParser ){
pParser->idx = -1;
}
return pParser;
}
/* The following function deletes the value associated with a
** symbol. The symbol can be either a terminal or nonterminal.
** "yymajor" is the symbol code, and "yypminor" is a pointer to
** the value.
*/
static void yy_destructor(YYCODETYPE yymajor, YYMINORTYPE *yypminor){
switch( yymajor ){
/* Here is inserted the actions which take place when a
** terminal or non-terminal is destroyed. This can happen
** when the symbol is popped from the stack during a
** reduce or during error processing or when a parser is
** being destroyed before it is finished parsing.
**
** Note: during a reduce, the only symbols destroyed are those
** which appear on the RHS of the rule, but which are not used
** inside the C code.
*/
%%
default: break; /* If no destructor action specified: do nothing */
}
}
/*
** Pop the parser's stack once.
**
** If there is a destructor routine associated with the token which
** is popped from the stack, then call it.
**
** Return the major token number for the symbol popped.
*/
static int yy_pop_parser_stack(yyParser *pParser){
YYCODETYPE yymajor;
if( pParser->idx<0 ) return 0;
#ifndef NDEBUG
if( yyTraceFILE && pParser->idx>=0 ){
fprintf(yyTraceFILE,"%sPopping %s\n",
yyTracePrompt,
yyTokenName[pParser->top->major]);
}
#endif
yymajor = pParser->top->major;
yy_destructor( yymajor, &pParser->top->minor);
pParser->idx--;
pParser->top--;
return yymajor;
}
/*
** Deallocate and destroy a parser. Destructors are all called for
** all stack elements before shutting the parser down.
**
** Inputs:
** <ul>
** <li> A pointer to the parser. This should be a pointer
** obtained from ParseAlloc.
** <li> A pointer to a function used to reclaim memory obtained
** from malloc.
** </ul>
*/
/* SQLITE MODIFICATION: Give the function file scope */
void ParseFree(
void *p, /* The parser to be deleted */
void (*freeProc)() /* Function used to reclaim memory */
){
yyParser *pParser = (yyParser*)p;
if( pParser==0 ) return;
while( pParser->idx>=0 ) yy_pop_parser_stack(pParser);
(*freeProc)(pParser, __FILE__, __LINE__);
}
/*
** Find the appropriate action for a parser given the look-ahead token.
**
** If the look-ahead token is YYNOCODE, then check to see if the action is
** independent of the look-ahead. If it is, return the action, otherwise
** return YY_NO_ACTION.
*/
static int yy_find_parser_action(
yyParser *pParser, /* The parser */
int iLookAhead /* The look-ahead token */
){
struct yyStateEntry *pState; /* Appropriate entry in the state table */
struct yyActionEntry *pAction; /* Action appropriate for the look-ahead */
/* if( pParser->idx<0 ) return YY_NO_ACTION; */
pState = &yyStateTable[pParser->top->stateno];
if( iLookAhead!=YYNOCODE ){
pAction = &pState->hashtbl[iLookAhead & pState->mask];
while( pAction ){
if( pAction->lookahead==iLookAhead ) return pAction->action;
pAction = pAction->next;
}
}else if( pState->mask!=0 || pState->hashtbl->lookahead!=YYNOCODE ){
return YY_NO_ACTION;
}
return pState->actionDefault;
}
/*
** Perform a shift action.
*/
static void yy_shift(
yyParser *yypParser, /* The parser to be shifted */
int yyNewState, /* The new state to shift in */
int yyMajor, /* The major token to shift in */
YYMINORTYPE *yypMinor /* Pointer ot the minor token to shift in */
){
yypParser->idx++;
yypParser->top++;
if( yypParser->idx>=YYSTACKDEPTH ){
yypParser->idx--;
yypParser->top--;
#ifndef NDEBUG
if( yyTraceFILE ){
fprintf(yyTraceFILE,"%sStack Overflow!\n",yyTracePrompt);
}
#endif
while( yypParser->idx>=0 ) yy_pop_parser_stack(yypParser);
/* Here code is inserted which will execute if the parser
** stack every overflows */
%%
return;
}
yypParser->top->stateno = yyNewState;
yypParser->top->major = yyMajor;
yypParser->top->minor = *yypMinor;
#ifndef NDEBUG
if( yyTraceFILE && yypParser->idx>0 ){
int i;
fprintf(yyTraceFILE,"%sShift %d\n",yyTracePrompt,yyNewState);
fprintf(yyTraceFILE,"%sStack:",yyTracePrompt);
for(i=1; i<=yypParser->idx; i++)
fprintf(yyTraceFILE," %s",yyTokenName[yypParser->stack[i].major]);
fprintf(yyTraceFILE,"\n");
}
#endif
}
/* The following table contains information about every rule that
** is used during the reduce.
*/
static struct {
YYCODETYPE lhs; /* Symbol on the left-hand side of the rule */
unsigned char nrhs; /* Number of right-hand side symbols in the rule */
} yyRuleInfo[] = {
%%
};
static void yy_accept(); /* Forward declaration */
/*
** Perform a reduce action and the shift that must immediately
** follow the reduce.
*/
static void yy_reduce(
yyParser *yypParser, /* The parser */
int yyruleno /* Number of the rule by which to reduce */
ParseANSIARGDECL
){
int yygoto; /* The next state */
int yyact; /* The next action */
YYMINORTYPE yygotominor; /* The LHS of the rule reduced */
struct yyStackEntry *yymsp; /* The top of the parser's stack */
int yysize; /* Amount to pop the stack */
yymsp = yypParser->top;
switch( yyruleno ){
/* Beginning here are the reduction cases. A typical example
** follows:
** case 0:
** YYTRACE("<text of the rule>");
** #line <lineno> <grammarfile>
** { ... } // User supplied code
** #line <lineno> <thisfile>
** break;
*/
%%
};
yygoto = yyRuleInfo[yyruleno].lhs;
yysize = yyRuleInfo[yyruleno].nrhs;
yypParser->idx -= yysize;
yypParser->top -= yysize;
yyact = yy_find_parser_action(yypParser,yygoto);
if( yyact < YYNSTATE ){
yy_shift(yypParser,yyact,yygoto,&yygotominor);
}else if( yyact == YYNSTATE + YYNRULE + 1 ){
yy_accept(yypParser ParseARGDECL);
}
}
/*
** The following code executes when the parse fails
*/
static void yy_parse_failed(
yyParser *yypParser /* The parser */
ParseANSIARGDECL /* Extra arguments (if any) */
){
#ifndef NDEBUG
if( yyTraceFILE ){
fprintf(yyTraceFILE,"%sFail!\n",yyTracePrompt);
}
#endif
while( yypParser->idx>=0 ) yy_pop_parser_stack(yypParser);
/* Here code is inserted which will be executed whenever the
** parser fails */
%%
}
/*
** The following code executes when a syntax error first occurs.
*/
static void yy_syntax_error(
yyParser *yypParser, /* The parser */
int yymajor, /* The major type of the error token */
YYMINORTYPE yyminor /* The minor type of the error token */
ParseANSIARGDECL /* Extra arguments (if any) */
){
#define TOKEN (yyminor.yy0)
%%
}
/*
** The following is executed when the parser accepts
*/
static void yy_accept(
yyParser *yypParser /* The parser */
ParseANSIARGDECL /* Extra arguments (if any) */
){
#ifndef NDEBUG
if( yyTraceFILE ){
fprintf(yyTraceFILE,"%sAccept!\n",yyTracePrompt);
}
#endif
while( yypParser->idx>=0 ) yy_pop_parser_stack(yypParser);
/* Here code is inserted which will be executed whenever the
** parser accepts */
%%
}
/* The main parser program.
** The first argument is a pointer to a structure obtained from
** "ParseAlloc" which describes the current state of the parser.
** The second argument is the major token number. The third is
** the minor token. The fourth optional argument is whatever the
** user wants (and specified in the grammar) and is available for
** use by the action routines.
**
** Inputs:
** <ul>
** <li> A pointer to the parser (an opaque structure.)
** <li> The major token number.
** <li> The minor token number.
** <li> An option argument of a grammar-specified type.
** </ul>
**
** Outputs:
** None.
*/
/* SQLITE MODIFICATION: Give the function file scope */
void Parse(
void *yyp, /* The parser */
int yymajor, /* The major token code number */
ParseTOKENTYPE yyminor /* The value for the token */
ParseANSIARGDECL
){
YYMINORTYPE yyminorunion;
int yyact; /* The parser action. */
int yyendofinput; /* True if we are at the end of input */
int yyerrorhit = 0; /* True if yymajor has invoked an error */
yyParser *yypParser; /* The parser */
/* (re)initialize the parser, if necessary */
yypParser = (yyParser*)yyp;
if( yypParser->idx<0 ){
if( yymajor==0 ) return;
yypParser->idx = 0;
yypParser->errcnt = -1;
yypParser->top = &yypParser->stack[0];
yypParser->top->stateno = 0;
yypParser->top->major = 0;
}
yyminorunion.yy0 = yyminor;
yyendofinput = (yymajor==0);
#ifndef NDEBUG
if( yyTraceFILE ){
fprintf(yyTraceFILE,"%sInput %s\n",yyTracePrompt,yyTokenName[yymajor]);
}
#endif
do{
yyact = yy_find_parser_action(yypParser,yymajor);
if( yyact<YYNSTATE ){
yy_shift(yypParser,yyact,yymajor,&yyminorunion);
yypParser->errcnt--;
if( yyendofinput && yypParser->idx>=0 ){
yymajor = 0;
}else{
yymajor = YYNOCODE;
}
}else if( yyact < YYNSTATE + YYNRULE ){
yy_reduce(yypParser,yyact-YYNSTATE ParseARGDECL);
}else if( yyact == YY_ERROR_ACTION ){
#ifndef NDEBUG
if( yyTraceFILE ){
fprintf(yyTraceFILE,"%sSyntax Error!\n",yyTracePrompt);
}
#endif
#ifdef YYERRORSYMBOL
/* A syntax error has occurred.
** The response to an error depends upon whether or not the
** grammar defines an error token "ERROR".
**
** This is what we do if the grammar does define ERROR:
**
** * Call the %syntax_error function.
**
** * Begin popping the stack until we enter a state where
** it is legal to shift the error symbol, then shift
** the error symbol.
**
** * Set the error count to three.
**
** * Begin accepting and shifting new tokens. No new error
** processing will occur until three tokens have been
** shifted successfully.
**
*/
if( yypParser->errcnt<0 ){
yy_syntax_error(yypParser,yymajor,yyminorunion ParseARGDECL);
}
if( yypParser->top->major==YYERRORSYMBOL || yyerrorhit ){
#ifndef NDEBUG
if( yyTraceFILE ){
fprintf(yyTraceFILE,"%sDiscard input token %s\n",
yyTracePrompt,yyTokenName[yymajor]);
}
#endif
yy_destructor(yymajor,&yyminorunion);
yymajor = YYNOCODE;
}else{
while(
yypParser->idx >= 0 &&
yypParser->top->major != YYERRORSYMBOL &&
(yyact = yy_find_parser_action(yypParser,YYERRORSYMBOL)) >= YYNSTATE
){
yy_pop_parser_stack(yypParser);
}
if( yypParser->idx < 0 || yymajor==0 ){
yy_destructor(yymajor,&yyminorunion);
yy_parse_failed(yypParser ParseARGDECL);
yymajor = YYNOCODE;
}else if( yypParser->top->major!=YYERRORSYMBOL ){
YYMINORTYPE u2;
u2.YYERRSYMDT = 0;
yy_shift(yypParser,yyact,YYERRORSYMBOL,&u2);
}
}
yypParser->errcnt = 3;
yyerrorhit = 1;
#else /* YYERRORSYMBOL is not defined */
/* This is what we do if the grammar does not define ERROR:
**
** * Report an error message, and throw away the input token.
**
** * If the input token is $, then fail the parse.
**
** As before, subsequent error messages are suppressed until
** three input tokens have been successfully shifted.
*/
if( yypParser->errcnt<=0 ){
yy_syntax_error(yypParser,yymajor,yyminorunion ParseARGDECL);
}
yypParser->errcnt = 3;
yy_destructor(yymajor,&yyminorunion);
if( yyendofinput ){
yy_parse_failed(yypParser ParseARGDECL);
}
yymajor = YYNOCODE;
#endif
}else{
yy_accept(yypParser ParseARGDECL);
yymajor = YYNOCODE;
}
}while( yymajor!=YYNOCODE && yypParser->idx>=0 );
return;
}