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%define parse.error verbose
%{
/*
* R : A Computer Language for Statistical Data Analysis
* Copyright (C) 1997--2023 The R Core Team
* Copyright (C) 2009--2011 Romain Francois
* Copyright (C) 1995--1997 Robert Gentleman and Ross Ihaka
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, a copy is available at
* https://www.R-project.org/Licenses/
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#define R_USE_SIGNALS 1
#include "IOStuff.h" /*-> Defn.h */
#include "Fileio.h"
#include "Parse.h"
#include <R_ext/Print.h>
#if !defined(__STDC_ISO_10646__) && (defined(__APPLE__) || defined(__FreeBSD__) || defined(__sun))
/* This may not be 100% true (see the comment in rlocale.h),
but it seems true in normal locales.
*/
# define __STDC_ISO_10646__
#endif
/* #define YYDEBUG 1 */
#define YYERROR_VERBOSE 1
#define PARSE_ERROR_SIZE 256 /* Parse error messages saved here */
#define PARSE_CONTEXT_SIZE 256 /* Recent parse context kept in a circular buffer */
static Rboolean busy = FALSE;
static SEXP R_NullSymbol = NULL;
static int identifier ;
static void incrementId(void);
static void initData(void);
static void initId(void);
static void record_( int, int, int, int, int, int, char* ) ;
static void yyerror(const char *);
static int yylex(void);
int yyparse(void);
static FILE *fp_parse;
static int (*ptr_getc)(void);
static int SavedToken;
static SEXP SavedLval;
#define yyconst const
typedef struct yyltype
{
int first_line;
int first_column;
int first_byte;
int last_line;
int last_column;
int last_byte;
int first_parsed;
int last_parsed;
int id;
} yyltype;
#define INIT_DATA_COUNT 16384 /* init parser data to this size */
#define MAX_DATA_COUNT 65536 /* release it at the end if it is this size or larger*/
#define DATA_COUNT (length( PS_DATA ) / DATA_ROWS)
#define ID_COUNT ((length( PS_IDS ) / 2) - 1)
static void finalizeData(void) ;
static void growData(void) ;
static void growID( int ) ;
#define DATA_ROWS 8
#define _FIRST_PARSED( i ) INTEGER( PS_DATA )[ DATA_ROWS*(i) ]
#define _FIRST_COLUMN( i ) INTEGER( PS_DATA )[ DATA_ROWS*(i) + 1 ]
#define _LAST_PARSED( i ) INTEGER( PS_DATA )[ DATA_ROWS*(i) + 2 ]
#define _LAST_COLUMN( i ) INTEGER( PS_DATA )[ DATA_ROWS*(i) + 3 ]
#define _TERMINAL( i ) INTEGER( PS_DATA )[ DATA_ROWS*(i) + 4 ]
#define _TOKEN( i ) INTEGER( PS_DATA )[ DATA_ROWS*(i) + 5 ]
#define _ID( i ) INTEGER( PS_DATA )[ DATA_ROWS*(i) + 6 ]
#define _PARENT(i) INTEGER( PS_DATA )[ DATA_ROWS*(i) + 7 ]
#define ID_ID( i ) INTEGER(PS_IDS)[ 2*(i) ]
#define ID_PARENT( i ) INTEGER(PS_IDS)[ 2*(i) + 1 ]
static void modif_token( yyltype*, int ) ;
static void recordParents( int, yyltype*, int) ;
static int _current_token ;
/**
* Records the current non-terminal token expression and gives it an id
*
* @param loc the location of the expression
*/
static void setId(yyltype loc){
record_(
(loc).first_parsed, (loc).first_column, (loc).last_parsed, (loc).last_column,
_current_token, (loc).id, 0 ) ;
}
# define YYLTYPE yyltype
# define YYLLOC_DEFAULT(Current, Rhs, N) \
do { \
if (N){ \
(Current).first_line = YYRHSLOC (Rhs, 1).first_line; \
(Current).first_column = YYRHSLOC (Rhs, 1).first_column; \
(Current).first_byte = YYRHSLOC (Rhs, 1).first_byte; \
(Current).last_line = YYRHSLOC (Rhs, N).last_line; \
(Current).last_column = YYRHSLOC (Rhs, N).last_column; \
(Current).last_byte = YYRHSLOC (Rhs, N).last_byte; \
(Current).first_parsed = YYRHSLOC (Rhs, 1).first_parsed; \
(Current).last_parsed = YYRHSLOC (Rhs, N).last_parsed; \
incrementId( ) ; \
(Current).id = identifier ; \
_current_token = yyr1[yyn] ; \
if (ParseState.keepSrcRefs && ParseState.keepParseData) { \
yyltype childs[N]; \
int ii = 0; \
for(ii=0; ii<N; ii++){ \
childs[ii] = YYRHSLOC (Rhs, (ii+1) ) ; \
} \
recordParents( identifier, childs, N) ; \
} \
} else { \
(Current).first_line = (Current).last_line = \
YYRHSLOC (Rhs, 0).last_line; \
(Current).first_parsed = (Current).last_parsed = \
YYRHSLOC (Rhs, 0).last_parsed; \
(Current).first_column = YYRHSLOC (Rhs, 0).last_column; \
(Current).last_column = (Current).first_column - 1; \
(Current).first_byte = YYRHSLOC (Rhs, 0).last_byte; \
(Current).last_byte = (Current).first_byte - 1; \
(Current).id = NA_INTEGER; \
} \
} while (0)
# define YY_LOCATION_PRINT(File,Loc) \
fprintf ( File, "%d.%d.%d-%d.%d.%d (%d)", \
(Loc).first_line, (Loc).first_column, (Loc).first_byte, \
(Loc).last_line, (Loc).last_column, (Loc).last_byte, \
(Loc).id )
/* Useful defines so editors don't get confused ... */
#define LBRACE '{'
#define RBRACE '}'
/* Functions used in the parsing process */
static void CheckFormalArgs(SEXP, SEXP, YYLTYPE *);
static SEXP FirstArg(SEXP, SEXP); /* create list with one element */
static void GrowList(SEXP, SEXP); /* add element to list end */
static void SetSingleSrcRef(SEXP);
static void AppendToSrcRefs(SEXP);
static void PrependToSrcRefs(SEXP);
static SEXP SrcRefsToVectorList(void);
static void IfPush(void);
static int KeywordLookup(const char *);
static SEXP NewList(void);
static void NextArg(SEXP, SEXP, SEXP); /* add named element to list end */
static SEXP TagArg(SEXP, SEXP, YYLTYPE *);
static int processLineDirective(int *);
static int checkForPlaceholder(SEXP placeholder, SEXP arg);
static int HavePlaceholder = FALSE;
attribute_hidden SEXP R_PlaceholderToken = NULL;
static int HavePipeBind = FALSE;
static SEXP R_PipeBindSymbol = NULL;
/* These routines allocate constants */
static SEXP mkComplex(const char *);
SEXP mkFalse(void);
static SEXP mkFloat(const char *);
static SEXP mkInt(const char *);
static SEXP mkNA(void);
SEXP mkTrue(void);
/* Internal lexer / parser state variables */
static int EatLines = 0;
static int GenerateCode = 0;
static int EndOfFile = 0;
static int Status = 1;
static int xxgetc(void);
static int xxungetc(int);
static int xxcharcount, xxcharsave;
static int xxlinesave, xxbytesave, xxcolsave, xxparsesave;
static SrcRefState ParseState;
#define PS_SET_SRCREFS(x) SET_VECTOR_ELT(ParseState.sexps, 0, (x))
#define PS_SET_SRCFILE(x) SET_VECTOR_ELT(ParseState.sexps, 1, (x))
#define PS_SET_ORIGINAL(x) SET_VECTOR_ELT(ParseState.sexps, 2, (x))
/* direct pointer to data is kept for performance of finalizeData() */
#define PS_SET_DATA(x) do { \
SEXP __x__ = (x); \
SET_VECTOR_ELT(ParseState.sexps, 3, __x__); \
ParseState.data = __x__; \
} while(0);
#define PS_SET_TEXT(x) SET_VECTOR_ELT(ParseState.sexps, 4, (x))
#define PS_SET_IDS(x) SET_VECTOR_ELT(ParseState.sexps, 5, (x))
#define PS_SET_SVS(x) SET_VECTOR_ELT(ParseState.sexps, 6, (x))
#define PS_SRCREFS VECTOR_ELT(ParseState.sexps, 0)
#define PS_SRCFILE VECTOR_ELT(ParseState.sexps, 1)
#define PS_ORIGINAL VECTOR_ELT(ParseState.sexps, 2)
#define PS_DATA ParseState.data
#define PS_TEXT VECTOR_ELT(ParseState.sexps, 4)
#define PS_IDS VECTOR_ELT(ParseState.sexps, 5)
#define PS_SVS VECTOR_ELT(ParseState.sexps, 6)
/* These definitions are for error conditions */
#define NO_VALUE 0
#define STRING_VALUE 1
#define INT_VALUE 2
#define UINT_VALUE 3
#define CHAR_VALUE 4
#define UCS_VALUE 5
NORET static void raiseParseError(const char *, SEXP, int,
const void *, YYLTYPE *, const char *);
NORET static void raiseLexError(const char *, int,
const void *, const char *);
/* Memory protection in the parser
The generated code of the parser keeps semantic values (SEXPs) on its
semantic values stack. Values are added to the stack during shift and
reduce operations and are removed during reduce operations or error
handling. Values are created by the lexer before they are added to the
stack. Values are also held in a local SEXP variable once removed from
the stack but still needed. The stack is automatically expanded on demand.
For memory protection, it would be natural to have that stack on the R heap
and to use PROTECT/UNPROTECT to protect values in local SEXP variables.
Unfortunately, bison does not seem to be customizable enough to allow this.
Hence, semantic values, when created by the lexer or reduce operations, are
placed on parser state precious multi-set via PRESERVE_SV. They are removed
from the multi-set in reduce operations using RELEASE_SV, because by design
of the bison parsers such values are subsequently removed from the stack.
They are also automatically removed when the parsing finishes, including
parser error (also on R error, via the context on-end action).
Previously semantic values were protected via PROTECT/UNPROTECT_PTR with
similar semantics but using protect stack shared with PROTECT/UNPROTECT.
Using a separate precious multi-set is safe even with interleaving of the
two protection schemes.
*/
#define INIT_SVS() PS_SET_SVS(R_NewPreciousMSet(200))
#define PRESERVE_SV(x) R_PreserveInMSet((x), PS_SVS)
#define RELEASE_SV(x) R_ReleaseFromMSet((x), PS_SVS)
#define CLEAR_SVS() R_ReleaseMSet(PS_SVS, 500)
/* Memory leak
yyparse(), as generated by bison, allocates extra space for the parser
stack using malloc(). Unfortunately this means that there is a memory
leak in case of an R error (long-jump). In principle, we could define
yyoverflow() to relocate the parser stacks for bison and allocate say on
the R heap, but yyoverflow() is undocumented and somewhat complicated
(we would have to replicate some macros from the generated parser here).
The same problem exists at least in the Rd and LaTeX parsers in tools.
*/
#include <rlocale.h>
#ifdef HAVE_LANGINFO_CODESET
# include <langinfo.h>
#endif
// FIXME potentially need R_wchar_t with UTF-8 Windows.
static int mbcs_get_next(int c, wchar_t *wc)
{
int i, res, clen = 1; char s[9];
mbstate_t mb_st;
s[0] = (char) c;
/* This assumes (probably OK) that all MBCS embed ASCII as single-byte
lead bytes, including control chars */
if((unsigned int) c < 0x80) {
*wc = (wchar_t) c;
return 1;
}
if(utf8locale) {
clen = utf8clen((char) c);
for(i = 1; i < clen; i++) {
c = xxgetc();
if(c == R_EOF) { /* EOF whilst reading MBCS char */
for(i--; i > 0; i--) xxungetc(s[i]);
return -1;
}
s[i] = (char) c;
}
s[clen] ='\0'; /* x86 Solaris requires this */
mbs_init(&mb_st);
res = (int) mbrtowc(wc, s, clen, &mb_st);
if(res == -1) raiseLexError("invalidMBCS", NO_VALUE, NULL,
_("invalid multibyte character in parser (%s:%d:%d)"));
} else {
/* This is not necessarily correct for stateful MBCS */
while(clen <= R_MB_CUR_MAX) {
mbs_init(&mb_st);
res = (int) mbrtowc(wc, s, clen, &mb_st);
if(res >= 0) break;
if(res == -1)
raiseLexError("invalidMBCS", NO_VALUE, NULL,
_("invalid multibyte character in parser (%s:%d:%d)"));
/* so res == -2 */
c = xxgetc();
if(c == R_EOF) { /* EOF whilst reading MBCS char */
for(i = clen - 1; i > 0; i--) xxungetc(s[i]);
return -1;
}
s[clen++] = (char) c;
} /* we've tried enough, so must be complete or invalid by now */
}
for(i = clen - 1; i > 0; i--) xxungetc(s[i]);
return clen;
}
/* Soon to be defunct entry points */
void R_SetInput(int);
int R_fgetc(FILE*);
/* Routines used to build the parse tree */
static SEXP xxnullformal(void);
static SEXP xxfirstformal0(SEXP);
static SEXP xxfirstformal1(SEXP, SEXP);
static SEXP xxaddformal0(SEXP, SEXP, YYLTYPE *);
static SEXP xxaddformal1(SEXP, SEXP, SEXP, YYLTYPE *);
static SEXP xxexprlist0(void);
static SEXP xxexprlist1(SEXP, YYLTYPE *);
static SEXP xxexprlist2(SEXP, SEXP, YYLTYPE *);
static SEXP xxsub0(void);
static SEXP xxsub1(SEXP, YYLTYPE *);
static SEXP xxsymsub0(SEXP, YYLTYPE *);
static SEXP xxsymsub1(SEXP, SEXP, YYLTYPE *);
static SEXP xxnullsub0(YYLTYPE *);
static SEXP xxnullsub1(SEXP, YYLTYPE *);
static SEXP xxsublist1(SEXP);
static SEXP xxsublist2(SEXP, SEXP);
static SEXP xxcond(SEXP);
static SEXP xxifcond(SEXP);
static SEXP xxif(SEXP, SEXP, SEXP);
static SEXP xxifelse(SEXP, SEXP, SEXP, SEXP);
static SEXP xxforcond(SEXP, SEXP);
static SEXP xxfor(SEXP, SEXP, SEXP);
static SEXP xxwhile(SEXP, SEXP, SEXP);
static SEXP xxrepeat(SEXP, SEXP);
static SEXP xxnxtbrk(SEXP);
static SEXP xxfuncall(SEXP, SEXP);
static SEXP xxdefun(SEXP, SEXP, SEXP, YYLTYPE *);
static SEXP xxpipe(SEXP, SEXP, YYLTYPE *);
static SEXP xxpipebind(SEXP, SEXP, SEXP, YYLTYPE *);
static SEXP xxunary(SEXP, SEXP);
static SEXP xxbinary(SEXP, SEXP, SEXP);
static SEXP xxparen(SEXP, SEXP);
static SEXP xxsubscript(SEXP, SEXP, SEXP);
static SEXP xxexprlist(SEXP, YYLTYPE *, SEXP);
static int xxvalue(SEXP, int, YYLTYPE *);
#define YYSTYPE SEXP
%}
%token-table
%token END_OF_INPUT ERROR
%token STR_CONST NUM_CONST NULL_CONST SYMBOL FUNCTION
%token INCOMPLETE_STRING
%token LEFT_ASSIGN EQ_ASSIGN RIGHT_ASSIGN LBB
%token FOR IN IF ELSE WHILE NEXT BREAK REPEAT
%token GT GE LT LE EQ NE AND OR AND2 OR2
%token NS_GET NS_GET_INT
%token COMMENT LINE_DIRECTIVE
%token SYMBOL_FORMALS
%token EQ_FORMALS
%token EQ_SUB SYMBOL_SUB
%token SYMBOL_FUNCTION_CALL
%token SYMBOL_PACKAGE
/* no longer used: %token COLON_ASSIGN */
%token SLOT
%token PIPE
%token PLACEHOLDER
%token PIPEBIND
/* This is the precedence table, low to high */
%left '?'
%left LOW WHILE FOR REPEAT
%right IF
%left ELSE
%right LEFT_ASSIGN
%right EQ_ASSIGN
%left RIGHT_ASSIGN
%left '~' TILDE
%left OR OR2
%left AND AND2
%left UNOT NOT
%nonassoc GT GE LT LE EQ NE
%left '+' '-'
%left '*' '/'
%left SPECIAL PIPE
%left PIPEBIND
%left ':'
%left UMINUS UPLUS
%right '^'
%left '$' '@'
%left NS_GET NS_GET_INT
%nonassoc '(' '[' LBB
%%
prog : END_OF_INPUT { Status = 0; YYACCEPT; }
| '\n' { Status = 2; yyresult = xxvalue(NULL,2,NULL); YYACCEPT; }
| expr_or_assign_or_help '\n' { Status = 3; yyresult = xxvalue($1,3,&@1); YYACCEPT; }
| expr_or_assign_or_help ';' { Status = 4; yyresult = xxvalue($1,4,&@1); YYACCEPT; }
| error { Status = 1; YYABORT; }
;
expr_or_assign_or_help : expr { $$ = $1; }
| expr_or_assign_or_help EQ_ASSIGN expr_or_assign_or_help { $$ = xxbinary($2,$1,$3); setId(@$); }
| expr_or_assign_or_help '?' expr_or_assign_or_help { $$ = xxbinary($2,$1,$3); setId(@$); }
;
expr_or_help : expr { $$ = $1; }
| expr_or_help '?' expr_or_help { $$ = xxbinary($2,$1,$3); setId(@$); }
;
expr : NUM_CONST { $$ = $1; setId(@$); }
| STR_CONST { $$ = $1; setId(@$); }
| NULL_CONST { $$ = $1; setId(@$); }
| PLACEHOLDER { $$ = $1; setId(@$); }
| SYMBOL { $$ = $1; setId(@$); }
| '{' exprlist '}' { $$ = xxexprlist($1,&@1,$2); setId(@$); }
| '(' expr_or_assign_or_help ')' { $$ = xxparen($1,$2); setId(@$); }
| '-' expr %prec UMINUS { $$ = xxunary($1,$2); setId(@$); }
| '+' expr %prec UMINUS { $$ = xxunary($1,$2); setId(@$); }
| '!' expr %prec UNOT { $$ = xxunary($1,$2); setId(@$); }
| '~' expr %prec TILDE { $$ = xxunary($1,$2); setId(@$); }
| '?' expr_or_assign_or_help { $$ = xxunary($1,$2); setId(@$); }
| expr ':' expr { $$ = xxbinary($2,$1,$3); setId(@$); }
| expr '+' expr { $$ = xxbinary($2,$1,$3); setId(@$); }
| expr '-' expr { $$ = xxbinary($2,$1,$3); setId(@$); }
| expr '*' expr { $$ = xxbinary($2,$1,$3); setId(@$); }
| expr '/' expr { $$ = xxbinary($2,$1,$3); setId(@$); }
| expr '^' expr { $$ = xxbinary($2,$1,$3); setId(@$); }
| expr SPECIAL expr { $$ = xxbinary($2,$1,$3); setId(@$); }
| expr '~' expr { $$ = xxbinary($2,$1,$3); setId(@$); }
| expr LT expr { $$ = xxbinary($2,$1,$3); setId(@$); }
| expr LE expr { $$ = xxbinary($2,$1,$3); setId(@$); }
| expr EQ expr { $$ = xxbinary($2,$1,$3); setId(@$); }
| expr NE expr { $$ = xxbinary($2,$1,$3); setId(@$); }
| expr GE expr { $$ = xxbinary($2,$1,$3); setId(@$); }
| expr GT expr { $$ = xxbinary($2,$1,$3); setId(@$); }
| expr AND expr { $$ = xxbinary($2,$1,$3); setId(@$); }
| expr OR expr { $$ = xxbinary($2,$1,$3); setId(@$); }
| expr AND2 expr { $$ = xxbinary($2,$1,$3); setId(@$); }
| expr OR2 expr { $$ = xxbinary($2,$1,$3); setId(@$); }
| expr PIPE expr { $$ = xxpipe($1,$3,&@3); setId(@$); }
| expr PIPEBIND expr { $$ = xxpipebind($2,$1,$3,&@2); setId(@$); }
| expr LEFT_ASSIGN expr { $$ = xxbinary($2,$1,$3); setId(@$); }
| expr RIGHT_ASSIGN expr { $$ = xxbinary($2,$3,$1); setId(@$); }
| FUNCTION '(' formlist ')' cr expr_or_assign_or_help %prec LOW
{ $$ = xxdefun($1,$3,$6,&@$); setId(@$); }
| '\\' '(' formlist ')' cr expr_or_assign_or_help %prec LOW { $$ = xxdefun(R_FunctionSymbol,$3,$6,&@$); setId(@$); }
| expr '(' sublist ')' { $$ = xxfuncall($1,$3); setId(@$); modif_token( &@1, SYMBOL_FUNCTION_CALL ) ; }
| IF ifcond expr_or_assign_or_help { $$ = xxif($1,$2,$3); setId(@$); }
| IF ifcond expr_or_assign_or_help ELSE expr_or_assign_or_help { $$ = xxifelse($1,$2,$3,$5); setId(@$); }
| FOR forcond expr_or_assign_or_help %prec FOR { $$ = xxfor($1,$2,$3); setId(@$); }
| WHILE cond expr_or_assign_or_help { $$ = xxwhile($1,$2,$3); setId(@$); }
| REPEAT expr_or_assign_or_help { $$ = xxrepeat($1,$2); setId(@$); }
| expr LBB sublist ']' ']' { $$ = xxsubscript($1,$2,$3); setId(@$); }
| expr '[' sublist ']' { $$ = xxsubscript($1,$2,$3); setId(@$); }
| SYMBOL NS_GET SYMBOL { $$ = xxbinary($2,$1,$3); setId(@$); modif_token( &@1, SYMBOL_PACKAGE ) ; }
| SYMBOL NS_GET STR_CONST { $$ = xxbinary($2,$1,$3); setId(@$); modif_token( &@1, SYMBOL_PACKAGE ) ; }
| STR_CONST NS_GET SYMBOL { $$ = xxbinary($2,$1,$3); setId(@$); }
| STR_CONST NS_GET STR_CONST { $$ = xxbinary($2,$1,$3); setId(@$); }
| SYMBOL NS_GET_INT SYMBOL { $$ = xxbinary($2,$1,$3); setId(@$); modif_token( &@1, SYMBOL_PACKAGE ) ;}
| SYMBOL NS_GET_INT STR_CONST { $$ = xxbinary($2,$1,$3); setId(@$); modif_token( &@1, SYMBOL_PACKAGE ) ;}
| STR_CONST NS_GET_INT SYMBOL { $$ = xxbinary($2,$1,$3); setId(@$); }
| STR_CONST NS_GET_INT STR_CONST { $$ = xxbinary($2,$1,$3); setId(@$); }
| expr '$' SYMBOL { $$ = xxbinary($2,$1,$3); setId(@$); }
| expr '$' STR_CONST { $$ = xxbinary($2,$1,$3); setId(@$); }
| expr '@' SYMBOL { $$ = xxbinary($2,$1,$3); setId(@$); modif_token( &@3, SLOT ) ; }
| expr '@' STR_CONST { $$ = xxbinary($2,$1,$3); setId(@$); }
| NEXT { $$ = xxnxtbrk($1); setId(@$); }
| BREAK { $$ = xxnxtbrk($1); setId(@$); }
;
cond : '(' expr_or_help ')' { $$ = xxcond($2); }
;
ifcond : '(' expr_or_help ')' { $$ = xxifcond($2); }
;
forcond : '(' SYMBOL IN expr_or_help ')' { $$ = xxforcond($2,$4); setId(@$); }
;
exprlist: { $$ = xxexprlist0(); setId(@$); }
| expr_or_assign_or_help { $$ = xxexprlist1($1, &@1); }
| exprlist ';' expr_or_assign_or_help { $$ = xxexprlist2($1, $3, &@3); }
| exprlist ';' { $$ = $1; setId(@$); }
| exprlist '\n' expr_or_assign_or_help { $$ = xxexprlist2($1, $3, &@3); }
| exprlist '\n' { $$ = $1;}
;
sublist : sub { $$ = xxsublist1($1); }
| sublist cr ',' sub { $$ = xxsublist2($1,$4); }
;
sub : { $$ = xxsub0(); }
| expr_or_help { $$ = xxsub1($1, &@1); }
| SYMBOL EQ_ASSIGN { $$ = xxsymsub0($1, &@1); modif_token( &@2, EQ_SUB ) ; modif_token( &@1, SYMBOL_SUB ) ; }
| SYMBOL EQ_ASSIGN expr_or_help { $$ = xxsymsub1($1,$3, &@1); modif_token( &@2, EQ_SUB ) ; modif_token( &@1, SYMBOL_SUB ) ; }
| STR_CONST EQ_ASSIGN { $$ = xxsymsub0($1, &@1); modif_token( &@2, EQ_SUB ) ; }
| STR_CONST EQ_ASSIGN expr_or_help { $$ = xxsymsub1($1,$3, &@1); modif_token( &@2, EQ_SUB ) ; }
| NULL_CONST EQ_ASSIGN { $$ = xxnullsub0(&@1); modif_token( &@2, EQ_SUB ) ; }
| NULL_CONST EQ_ASSIGN expr_or_help { $$ = xxnullsub1($3, &@1); modif_token( &@2, EQ_SUB ) ; }
;
formlist: { $$ = xxnullformal(); }
| SYMBOL { $$ = xxfirstformal0($1); modif_token( &@1, SYMBOL_FORMALS ) ; }
| SYMBOL EQ_ASSIGN expr_or_help { $$ = xxfirstformal1($1,$3); modif_token( &@1, SYMBOL_FORMALS ) ; modif_token( &@2, EQ_FORMALS ) ; }
| formlist ',' SYMBOL { $$ = xxaddformal0($1,$3, &@3); modif_token( &@3, SYMBOL_FORMALS ) ; }
| formlist ',' SYMBOL EQ_ASSIGN expr_or_help
{ $$ = xxaddformal1($1,$3,$5,&@3); modif_token( &@3, SYMBOL_FORMALS ) ; modif_token( &@4, EQ_FORMALS ) ;}
;
cr : { EatLines = 1; }
;
%%
/*----------------------------------------------------------------------------*/
static int (*ptr_getc)(void);
/* Private pushback, since file ungetc only guarantees one byte.
We need up to one MBCS-worth */
#define DECLARE_YYTEXT_BUFP(bp) char *bp = yytext ;
#define YYTEXT_PUSH(c, bp) do { \
if ((bp) - yytext >= sizeof(yytext) - 1){ \
raiseLexError("bufferOverflow", NO_VALUE, NULL, \
_("input buffer overflow (%s:%d:%d)")); \
} \
*(bp)++ = ((char)c); \
} while(0) ;
#define PUSHBACK_BUFSIZE 16
static int pushback[PUSHBACK_BUFSIZE];
static unsigned int npush = 0;
static int prevpos = 0;
static int prevlines[PUSHBACK_BUFSIZE];
static int prevcols[PUSHBACK_BUFSIZE];
static int prevbytes[PUSHBACK_BUFSIZE];
static int prevparse[PUSHBACK_BUFSIZE];
static int xxgetc(void)
{
int c;
if(npush) c = pushback[--npush]; else c = ptr_getc();
prevpos = (prevpos + 1) % PUSHBACK_BUFSIZE;
prevbytes[prevpos] = ParseState.xxbyteno;
prevlines[prevpos] = ParseState.xxlineno;
prevparse[prevpos] = ParseState.xxparseno;
prevcols[prevpos] = ParseState.xxcolno;
if (c == EOF) {
EndOfFile = 1;
return R_EOF;
}
R_ParseContextLast = (R_ParseContextLast + 1) % PARSE_CONTEXT_SIZE;
R_ParseContext[R_ParseContextLast] = (char) c;
if (c == '\n') {
ParseState.xxlineno += 1;
ParseState.xxcolno = 0;
ParseState.xxbyteno = 0;
ParseState.xxparseno += 1;
} else {
/* We only advance the column for the 1st byte in UTF-8, so handle later bytes specially */
if (!known_to_be_utf8 || (unsigned char)c < 0x80 || 0xC0 <= (unsigned char)c)
ParseState.xxcolno++;
ParseState.xxbyteno++;
}
if (c == '\t') ParseState.xxcolno = ((ParseState.xxcolno + 7) & ~7);
R_ParseContextLine = ParseState.xxlineno;
xxcharcount++;
return c;
}
static int xxungetc(int c)
{
/* this assumes that c was the result of xxgetc; if not, some edits will be needed */
ParseState.xxlineno = prevlines[prevpos];
ParseState.xxbyteno = prevbytes[prevpos];
ParseState.xxcolno = prevcols[prevpos];
ParseState.xxparseno = prevparse[prevpos];
prevpos = (prevpos + PUSHBACK_BUFSIZE - 1) % PUSHBACK_BUFSIZE;
R_ParseContextLine = ParseState.xxlineno;
xxcharcount--;
R_ParseContext[R_ParseContextLast] = '\0';
/* precaution as to how % is implemented for < 0 numbers */
R_ParseContextLast = (R_ParseContextLast + PARSE_CONTEXT_SIZE -1) % PARSE_CONTEXT_SIZE;
if(npush >= PUSHBACK_BUFSIZE) return EOF;
pushback[npush++] = c;
return c;
}
/* Only used from finish_mbcs_in_parse_context. */
static int add_mbcs_byte_to_parse_context(void)
{
int c;
if (EndOfFile)
raiseLexError("invalidMBCS", NO_VALUE, NULL,
_("invalid multibyte character in parser (%s:%d:%d)"));
if(npush)
c = pushback[--npush];
else
c = ptr_getc();
if (c == EOF)
raiseLexError("invalidMBCS", NO_VALUE, NULL,
_("invalid multibyte character in parser (%s:%d:%d)"));
R_ParseContextLast = (R_ParseContextLast + 1) % PARSE_CONTEXT_SIZE;
R_ParseContext[R_ParseContextLast] = (char) c;
return c;
}
/* On error, the parse context may end inside a multi-byte character. Add
the missing bytes to the context to so that it contains full characters. */
static void finish_mbcs_in_parse_context(void)
{
int i, c, nbytes = 0, first;
Rboolean mbcs = FALSE;
/* find the first byte of the context */
for(i = R_ParseContextLast;
R_ParseContext[i];
i = (i + PARSE_CONTEXT_SIZE - 1) % PARSE_CONTEXT_SIZE) {
nbytes++;
if (nbytes == PARSE_CONTEXT_SIZE)
break;
}
if (!nbytes)
return;
if (!R_ParseContext[i])
first = (i + 1) % PARSE_CONTEXT_SIZE;
else
/* The beginning of the context has been overwritten and for a general
encoding there is not way to recover it. It is possible for UTF-8,
though. */
return;
/* decode multi-byte characters */
for(i = 0; i < nbytes; i++) {
c = R_ParseContext[(first + i) % PARSE_CONTEXT_SIZE];
if ((unsigned int)c < 0x80) continue; /* ASCII */
if (utf8locale) {
/* UTF-8 could be handled more efficiently, searching from the end
of the string */
i += utf8clen((char) c) - 1;
if (i >= nbytes) {
while (i >= nbytes) {
add_mbcs_byte_to_parse_context();
nbytes++;
}
return;
}
} else
mbcs = TRUE;
}
if (!mbcs)
return;
/* copy the context to a linear buffer */
char buf[nbytes + R_MB_CUR_MAX];
for(i = 0; i < nbytes; i++)
buf[i] = R_ParseContext[(first + i) % PARSE_CONTEXT_SIZE];
for(i = 0; i < nbytes; i++) {
wchar_t wc;
int res;
mbstate_t mb_st;
mbs_init(&mb_st);
res = (int) mbrtowc(&wc, buf + i, nbytes - i, &mb_st);
while (res == -2 && nbytes < sizeof(buf)) {
/* This is not necessarily correct for stateful MBCS */
buf[nbytes++] = (char) add_mbcs_byte_to_parse_context();
mbs_init(&mb_st);
res = (int) mbrtowc(&wc, buf + i, nbytes - i, &mb_st);
}
if (res == -1)
raiseLexError("invalidMBCS", NO_VALUE, NULL,
_("invalid multibyte character in parser (%s:%d:%d)"));
i += res - 1;
}
}
/*
* Increments/inits the token/grouping counter
*/
static void incrementId(void){
identifier++;
}
static void initId(void){
identifier = 0 ;
}
static SEXP makeSrcref(YYLTYPE *lloc, SEXP srcfile)
{
SEXP val;
PROTECT(val = allocVector(INTSXP, 8));
INTEGER(val)[0] = lloc->first_line;
INTEGER(val)[1] = lloc->first_byte;
INTEGER(val)[2] = lloc->last_line;
INTEGER(val)[3] = lloc->last_byte;
INTEGER(val)[4] = lloc->first_column;
INTEGER(val)[5] = lloc->last_column;
INTEGER(val)[6] = lloc->first_parsed;
INTEGER(val)[7] = lloc->last_parsed;
setAttrib(val, R_SrcfileSymbol, srcfile);
setAttrib(val, R_ClassSymbol, mkString("srcref"));
UNPROTECT(1); /* val */
return val;
}
static void attachSrcrefs(SEXP val)
{
SEXP srval;
PROTECT(srval = SrcRefsToVectorList());
setAttrib(val, R_SrcrefSymbol, srval);
setAttrib(val, R_SrcfileSymbol, PS_SRCFILE);
{
YYLTYPE wholeFile;
wholeFile.first_line = 1;
wholeFile.first_byte = 0;
wholeFile.first_column = 0;
wholeFile.last_line = ParseState.xxlineno;
wholeFile.last_byte = ParseState.xxbyteno;
wholeFile.last_column = ParseState.xxcolno;
wholeFile.first_parsed = 1;
wholeFile.last_parsed = ParseState.xxparseno;
setAttrib(val, R_WholeSrcrefSymbol, makeSrcref(&wholeFile, PS_SRCFILE));
}
PS_SET_SRCREFS(R_NilValue);
ParseState.didAttach = TRUE;
UNPROTECT(1); /* srval */
}
static int xxvalue(SEXP v, int k, YYLTYPE *lloc)
{
if (k > 2) {
if (ParseState.keepSrcRefs) {
SEXP s = PROTECT(makeSrcref(lloc, PS_SRCFILE));
AppendToSrcRefs(s);
UNPROTECT(1); /* s */
}
RELEASE_SV(v);
}
R_CurrentExpr = v;
return k;
}
static SEXP xxnullformal(void)
{
SEXP ans;
PRESERVE_SV(ans = R_NilValue);
return ans;
}
static SEXP xxfirstformal0(SEXP sym)
{
SEXP ans;
if (GenerateCode)
PRESERVE_SV(ans = FirstArg(R_MissingArg, sym));
else
PRESERVE_SV(ans = R_NilValue);
RELEASE_SV(sym);
return ans;
}
static SEXP xxfirstformal1(SEXP sym, SEXP expr)
{
SEXP ans;
if (GenerateCode)
PRESERVE_SV(ans = FirstArg(expr, sym));
else
PRESERVE_SV(ans = R_NilValue);
RELEASE_SV(expr);
RELEASE_SV(sym);
return ans;
}
static SEXP xxaddformal0(SEXP formlist, SEXP sym, YYLTYPE *lloc)
{
SEXP ans;
if (GenerateCode) {
CheckFormalArgs(formlist, sym, lloc);
NextArg(formlist, R_MissingArg, sym);
ans = formlist;
} else {
RELEASE_SV(formlist);
PRESERVE_SV(ans = R_NilValue);
}
RELEASE_SV(sym);
return ans;
}
static SEXP xxaddformal1(SEXP formlist, SEXP sym, SEXP expr, YYLTYPE *lloc)
{
SEXP ans;
if (GenerateCode) {
CheckFormalArgs(formlist, sym, lloc);
NextArg(formlist, expr, sym);
ans = formlist;
} else {
RELEASE_SV(formlist);
PRESERVE_SV(ans = R_NilValue);
}
RELEASE_SV(expr);
RELEASE_SV(sym);
return ans;
}
static SEXP xxexprlist0(void)
{
SEXP ans;
if (GenerateCode) {
PRESERVE_SV(ans = NewList());
if (ParseState.keepSrcRefs) {
setAttrib(ans, R_SrcrefSymbol, PS_SRCREFS);
PS_SET_SRCREFS(R_NilValue);
}
}
else
PRESERVE_SV(ans = R_NilValue);
return ans;
}
static SEXP xxexprlist1(SEXP expr, YYLTYPE *lloc)
{
SEXP ans;
if (GenerateCode) {
PRESERVE_SV(ans = NewList());
if (ParseState.keepSrcRefs) {
setAttrib(ans, R_SrcrefSymbol, PS_SRCREFS);
SEXP s = PROTECT(makeSrcref(lloc, PS_SRCFILE));
SetSingleSrcRef(s);
UNPROTECT(1); /* s */
}
GrowList(ans, expr);
}
else
PRESERVE_SV(ans = R_NilValue);
RELEASE_SV(expr);
return ans;
}
static SEXP xxexprlist2(SEXP exprlist, SEXP expr, YYLTYPE *lloc)
{
SEXP ans;
if (GenerateCode) {
if (ParseState.keepSrcRefs) {
SEXP s = PROTECT(makeSrcref(lloc, PS_SRCFILE));
AppendToSrcRefs(s);
UNPROTECT(1); /* s */
}
GrowList(exprlist, expr);
ans = exprlist;
} else {
RELEASE_SV(exprlist);
PRESERVE_SV(ans = R_NilValue);
}
RELEASE_SV(expr);
return ans;
}
static SEXP xxsub0(void)
{
SEXP ans;
if (GenerateCode)
PRESERVE_SV(ans = lang2(R_MissingArg,R_NilValue));
else
PRESERVE_SV(ans = R_NilValue);
return ans;
}
static SEXP xxsub1(SEXP expr, YYLTYPE *lloc)
{
SEXP ans;
if (GenerateCode)
PRESERVE_SV(ans = TagArg(expr, R_NilValue, lloc));
else
PRESERVE_SV(ans = R_NilValue);
RELEASE_SV(expr);
return ans;
}
static SEXP xxsymsub0(SEXP sym, YYLTYPE *lloc)
{
SEXP ans;
if (GenerateCode)
PRESERVE_SV(ans = TagArg(R_MissingArg, sym, lloc));
else
PRESERVE_SV(ans = R_NilValue);
RELEASE_SV(sym);
return ans;
}
static SEXP xxsymsub1(SEXP sym, SEXP expr, YYLTYPE *lloc)
{
SEXP ans;
if (GenerateCode)
PRESERVE_SV(ans = TagArg(expr, sym, lloc));
else
PRESERVE_SV(ans = R_NilValue);
RELEASE_SV(expr);
RELEASE_SV(sym);
return ans;
}
static SEXP xxnullsub0(YYLTYPE *lloc)
{
SEXP ans;
if (GenerateCode)
PRESERVE_SV(ans = TagArg(R_MissingArg, R_NullSymbol, lloc));
else
PRESERVE_SV(ans = R_NilValue);
RELEASE_SV(R_NilValue);
return ans;
}
static SEXP xxnullsub1(SEXP expr, YYLTYPE *lloc)
{
SEXP ans;
if (GenerateCode)
PRESERVE_SV(ans = TagArg(expr, R_NullSymbol, lloc));
else
PRESERVE_SV(ans = R_NilValue);
RELEASE_SV(R_NilValue);
RELEASE_SV(expr);
return ans;
}