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postgresql/src/interfaces/ecpg/preproc/pgc.l

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%{
/*-------------------------------------------------------------------------
*
* pgc.l
* lexical scanner for ecpg
*
* This is a modified version of src/backend/parser/scan.l
*
*
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/interfaces/ecpg/preproc/pgc.l,v 1.59 2000/06/14 18:17:54 petere Exp $
*
*-------------------------------------------------------------------------
*/
#include <ctype.h>
#include <sys/types.h>
#include <limits.h>
#include <errno.h>
#include "postgres.h"
#include "miscadmin.h"
#include "nodes/parsenodes.h"
#include "nodes/pg_list.h"
#include "parser/scansup.h"
#include "extern.h"
#include "preproc.h"
#include "utils/builtins.h"
/* some versions of lex define this as a macro */
#if defined(yywrap)
#undef yywrap
#endif /* yywrap */
extern YYSTYPE yylval;
/*
* literalbuf is used to accumulate literal values when multiple rules
* are needed to parse a single literal. Call startlit to reset buffer
* to empty, addlit to add text. Note that the buffer is permanently
* malloc'd to the largest size needed so far in the current run.
*/
static char *literalbuf = NULL; /* expandable buffer */
static int literallen; /* actual current length */
static int literalalloc; /* current allocated buffer size */
#define startlit() (literalbuf[0] = '\0', literallen = 0)
static void addlit(char *ytext, int yleng);
int state_before;
struct _yy_buffer { YY_BUFFER_STATE buffer;
long lineno;
char * filename;
struct _yy_buffer * next;
} *yy_buffer = NULL;
static char *old;
#define MAX_NESTED_IF 128
static short preproc_tos;
static short ifcond;
static struct _if_value {
short condition;
short else_branch;
} stacked_if_value[MAX_NESTED_IF];
%}
%option yylineno
%s C SQL incl def def_ident
/*
* OK, here is a short description of lex/flex rules behavior.
* The longest pattern which matches an input string is always chosen.
* For equal-length patterns, the first occurring in the rules list is chosen.
* INITIAL is the starting state, to which all non-conditional rules apply.
* Exclusive states change parsing rules while the state is active. When in
* an exclusive state, only those rules defined for that state apply.
*
* We use exclusive states for quoted strings, extended comments,
* and to eliminate parsing troubles for numeric strings.
* Exclusive states:
* <xb> binary numeric string - thomas 1997-11-16
* <xc> extended C-style comments - thomas 1997-07-12
* <xd> delimited identifiers (double-quoted identifiers) - thomas 1997-10-27
* <xh> hexadecimal numeric string - thomas 1997-11-16
* <xq> quoted strings - thomas 1997-07-30
*/
%x xb
%x xc
%x xd
%x xdc
%x xh
%x xq
%x xpre
%x xcond
%x xskip
/* Binary number
*/
xbstart [bB]{quote}
xbstop {quote}
xbinside [^']+
xbcat {quote}{whitespace_with_newline}{quote}
/* Hexadecimal number
*/
xhstart [xX]{quote}
xhstop {quote}
xhinside [^']+
xhcat {quote}{whitespace_with_newline}{quote}
/* C version of hex number
*/
xch 0[xX][0-9A-Fa-f]*
/* Extended quote
* xqdouble implements SQL92 embedded quote
* xqcat allows strings to cross input lines
*/
quote '
xqstart {quote}
xqstop {quote}
xqdouble {quote}{quote}
xqinside [^\\']+
xqliteral [\\](.|\n)
xqcat {quote}{whitespace_with_newline}{quote}
/* Delimited quote
* Allows embedded spaces and other special characters into identifiers.
*/
dquote \"
xdstart {dquote}
xdstop {dquote}
xdinside [^"]+
/* special stuff for C strings */
xdcqq \\\\
xdcqdq \\\"
xdcother [^"]
xdcinside ({xdcqq}|{xdcqdq}|{xdcother})
/* C-style comments
*
* The "extended comment" syntax closely resembles allowable operator syntax.
* The tricky part here is to get lex to recognize a string starting with
* slash-star as a comment, when interpreting it as an operator would produce
* a longer match --- remember lex will prefer a longer match! Also, if we
* have something like plus-slash-star, lex will think this is a 3-character
* operator whereas we want to see it as a + operator and a comment start.
* The solution is two-fold:
* 1. append {op_chars}* to xcstart so that it matches as much text as
* {operator} would. Then the tie-breaker (first matching rule of same
* length) ensures xcstart wins. We put back the extra stuff with yyless()
* in case it contains a star-slash that should terminate the comment.
* 2. In the operator rule, check for slash-star within the operator, and
* if found throw it back with yyless(). This handles the plus-slash-star
* problem.
* SQL92-style comments, which start with dash-dash, have similar interactions
* with the operator rule.
*/
xcstart \/\*{op_chars}*
xcstop \*+\/
xcinside ([^*]+)|(\*+[^/])
digit [0-9]
letter [\200-\377_A-Za-z]
letter_or_digit [\200-\377_A-Za-z0-9]
identifier {letter}{letter_or_digit}*
typecast "::"
/*
* "self" is the set of chars that should be returned as single-character
* tokens. "op_chars" is the set of chars that can make up "Op" tokens,
* which can be one or more characters long (but if a single-char token
* appears in the "self" set, it is not to be returned as an Op). Note
* that the sets overlap, but each has some chars that are not in the other.
*
* If you change either set, adjust the character lists appearing in the
* rule for "operator"!
*/
self [,()\[\].;$\:\+\-\*\/\%\^\<\>\=\|]
op_chars [\~\!\@\#\^\&\|\`\?\$\:\+\-\*\/\%\<\>\=]
operator {op_chars}+
/* we no longer allow unary minus in numbers.
* instead we pass it separately to parser. there it gets
* coerced via doNegate() -- Leon aug 20 1999
*/
integer {digit}+
decimal (({digit}*\.{digit}+)|({digit}+\.{digit}*))
real ((({digit}*\.{digit}+)|({digit}+\.{digit}*)|({digit}+))([Ee][-+]?{digit}+))
param \${integer}
/*
* In order to make the world safe for Windows and Mac clients as well as
* Unix ones, we accept either \n or \r as a newline. A DOS-style \r\n
* sequence will be seen as two successive newlines, but that doesn't cause
* any problems. SQL92-style comments, which start with -- and extend to the
* next newline, are treated as equivalent to a single whitespace character.
*
* NOTE a fine point: if there is no newline following --, we will absorb
* everything to the end of the input as a comment. This is correct. Older
* versions of Postgres failed to recognize -- as a comment if the input
* did not end with a newline.
*
* XXX perhaps \f (formfeed) should be treated as a newline as well?
*/
ccomment "//".*\n
space [ \t\r\f]
space_or_nl [ \t\r\f\n]
line_end {space}*\n
horiz_space [ \t\f]
newline [\n\r]
non_newline [^\n\r]
comment ("--"{non_newline}*)
whitespace ({space}|{comment})
/*
* SQL92 requires at least one newline in the whitespace separating
* string literals that are to be concatenated. Silly, but who are we
* to argue? Note that {whitespace_with_newline} should not have * after
* it, whereas {whitespace} should generally have a * after it...
*/
horiz_whitespace ({horiz_space}|{comment})
whitespace_with_newline ({horiz_whitespace}*{newline}{whitespace}*)
other .
/* some stuff needed for ecpg */
exec [eE][xX][eE][cC]
sql [sS][qQ][lL]
define [dD][eE][fF][iI][nN][eE]
include [iI][nN][cC][lL][uU][dD][eE]
ifdef [iI][fF][dD][eE][fF]
ifndef [iI][fF][nN][dD][eE][fF]
else [eE][lL][sS][eE]
elif [eE][lL][iI][fF]
endif [eE][nN][dD][iI][fF]
exec_sql {exec}{space_or_nl}*{sql}{space_or_nl}*
/* Take care of cpp continuation lines */
cppline {space}*#(.*\\{line_end})*.*
/* DO NOT PUT ANY COMMENTS IN THE FOLLOWING SECTION.
* AT&T lex does not properly handle C-style comments in this second lex block.
* So, put comments here. thomas - 1997-09-08
*
* Quoted strings must allow some special characters such as single-quote
* and newline.
* Embedded single-quotes are implemented both in the SQL92-standard
* style of two adjacent single quotes "''" and in the Postgres/Java style
* of escaped-quote "\'".
* Other embedded escaped characters are matched explicitly and the leading
* backslash is dropped from the string. - thomas 1997-09-24
* Note that xcstart must appear before operator, as explained above!
* Also whitespace (comment) must appear before operator.
*/
%%
<SQL>{whitespace} { /* ignore */ }
{xcstart} {
state_before = YYSTATE;
BEGIN(xc);
/* Put back any characters past slash-star; see above */
yyless(2);
fputs("/*", yyout);
}
<xc>{xcstop} { ECHO; BEGIN(state_before); }
<xc>{xcinside} { ECHO; }
<xc><<EOF>> { mmerror(ET_ERROR, "Unterminated /* comment"); }
<SQL>{xbstart} {
BEGIN(xb);
startlit();
}
<xb>{xbstop} {
char* endptr;
BEGIN(SQL);
errno = 0;
yylval.ival = strtol(literalbuf, &endptr, 2);
if (*endptr != '\0' || errno == ERANGE)
mmerror(ET_ERROR, "Bad binary integer input!");
return ICONST;
}
<xh>{xhinside} |
<xb>{xbinside} {
addlit(yytext, yyleng);
}
<xh>{xhcat} |
<xb>{xbcat} {
/* ignore */
}
<xb><<EOF>> { mmerror(ET_ERROR, "Unterminated binary integer"); }
<SQL>{xhstart} {
BEGIN(xh);
startlit();
}
<xh>{xhstop} {
char* endptr;
BEGIN(SQL);
errno = 0;
yylval.ival = strtol(literalbuf, &endptr, 16);
if (*endptr != '\0' || errno == ERANGE)
mmerror(ET_ERROR, "Bad hexadecimal integer input");
return ICONST;
}
<xh><<EOF>> { mmerror(ET_ERROR, "Unterminated hexadecimal integer"); }
{xqstart} {
state_before = YYSTATE;
BEGIN(xq);
startlit();
}
<xq>{xqstop} {
BEGIN(state_before);
yylval.str = mm_strdup(literalbuf);
return SCONST;
}
<xq>{xqdouble} |
<xq>{xqinside} |
<xq>{xqliteral} {
addlit(yytext, yyleng);
}
<xq>{xqcat} {
/* ignore */
}
<xq><<EOF>> { mmerror(ET_ERROR, "Unterminated quoted string"); }
<SQL>{xdstart} {
state_before = YYSTATE;
BEGIN(xd);
startlit();
}
<xd,xdc>{xdstop} {
BEGIN(state_before);
yylval.str = mm_strdup(literalbuf);
return CSTRING;
}
<xd>{xdinside} {
addlit(yytext, yyleng);
}
<xd,xdc><<EOF>> { mmerror(ET_ERROR, "Unterminated quoted identifier"); }
{xdstart} {
state_before = YYSTATE;
BEGIN(xdc);
startlit();
}
<xdc>{xdcinside} {
addlit(yytext, yyleng);
}
<SQL>{typecast} { return TYPECAST; }
<SQL>{self} { /*
* We may find a ';' inside a structure
* definition in a TYPE or VAR statement.
* This is not an EOL marker.
*/
if (yytext[0] == ';' && struct_level == 0)
BEGIN C;
return yytext[0];
}
<SQL>{operator} {
/*
* Check for embedded slash-star or dash-dash; those
* are comment starts, so operator must stop there.
* Note that slash-star or dash-dash at the first
* character will match a prior rule, not this one.
*/
int nchars = yyleng;
char *slashstar = strstr((char*)yytext, "/*");
char *dashdash = strstr((char*)yytext, "--");
if (slashstar && dashdash)
{
/* if both appear, take the first one */
if (slashstar > dashdash)
slashstar = dashdash;
}
else if (!slashstar)
slashstar = dashdash;
if (slashstar)
nchars = slashstar - ((char*)yytext);
/*
* For SQL92 compatibility, '+' and '-' cannot be the
* last char of a multi-char operator unless the operator
* contains chars that are not in SQL92 operators.
* The idea is to lex '=-' as two operators, but not
* to forbid operator names like '?-' that could not be
* sequences of SQL92 operators.
*/
while (nchars > 1 &&
(yytext[nchars-1] == '+' ||
yytext[nchars-1] == '-'))
{
int ic;
for (ic = nchars-2; ic >= 0; ic--)
{
if (strchr("~!@#&`?$:%^|", yytext[ic]))
break;
}
if (ic >= 0)
break; /* found a char that makes it OK */
nchars--; /* else remove the +/-, and check again */
}
if (nchars < yyleng)
{
/* Strip the unwanted chars from the token */
yyless(nchars);
/*
* If what we have left is only one char, and it's
* one of the characters matching "self", then
* return it as a character token the same way
* that the "self" rule would have.
*/
if (nchars == 1 &&
strchr(",()[].;$:+-*/%^<>=|", yytext[0]))
return yytext[0];
}
/* Convert "!=" operator to "<>" for compatibility */
if (strcmp((char*)yytext, "!=") == 0)
yylval.str = mm_strdup("<>");
else
yylval.str = mm_strdup((char*)yytext);
return Op;
}
<SQL>{param} {
yylval.ival = atol((char*)&yytext[1]);
return PARAM;
}
<C,SQL>{integer} {
char* endptr;
errno = 0;
yylval.ival = strtol((char *)yytext, &endptr,10);
if (*endptr != '\0' || errno == ERANGE)
{
errno = 0;
yylval.str = mm_strdup((char*)yytext);
return FCONST;
}
return ICONST;
}
{decimal} {
yylval.str = mm_strdup((char*)yytext);
return FCONST;
}
<C,SQL>{real} {
yylval.str = mm_strdup((char*)yytext);
return FCONST;
}
<SQL>:{identifier}(("->"|\.){identifier})* {
yylval.str = mm_strdup((char*)yytext+1);
return(CVARIABLE);
}
<SQL>{identifier} {
int i;
ScanKeyword *keyword;
char lower_text[NAMEDATALEN];
/* this should leave the last byte set to '\0' */
strncpy(lower_text, yytext, NAMEDATALEN-1);
for(i = 0; lower_text[i]; i++)
if (isascii((int)lower_text[i]) && isupper((int) lower_text[i]))
lower_text[i] = tolower(lower_text[i]);
if (i >= NAMEDATALEN)
{
sprintf(errortext, "Identifier \"%s\" will be truncated to \"%.*s\"", yytext, NAMEDATALEN-1, yytext);
mmerror (ET_WARN, errortext);
yytext[NAMEDATALEN-1] = '\0';
}
keyword = ScanKeywordLookup((char*)lower_text);
if (keyword != NULL) {
return keyword->value;
}
else
{
keyword = ScanECPGKeywordLookup((char*)lower_text);
if (keyword != NULL) {
return keyword->value;
}
else
{
struct _defines *ptr;
for (ptr = defines; ptr; ptr = ptr->next)
{
if (strcmp(yytext, ptr->old) == 0)
{
struct _yy_buffer *yb;
yb = mm_alloc(sizeof(struct _yy_buffer));
yb->buffer = YY_CURRENT_BUFFER;
yb->lineno = yylineno;
yb->filename = mm_strdup(input_filename);
yb->next = yy_buffer;
yy_buffer = yb;
yy_scan_string(ptr->new);
break;
}
}
if (ptr == NULL)
{
yylval.str = mm_strdup((char*)yytext);
return IDENT;
}
}
}
}
<SQL>{other} { return yytext[0]; }
<C>{exec_sql} { BEGIN SQL; return SQL_START; }
<C>{ccomment} { /* ignore */ }
<C>{xch} {
char* endptr;
errno = 0;
yylval.ival = strtol((char *)yytext,&endptr,16);
if (*endptr != '\0' || errno == ERANGE)
{
errno = 0;
yylval.str = mm_strdup((char*)yytext);
return SCONST;
}
return ICONST;
}
<C>{cppline} {
yylval.str = mm_strdup((char*)yytext);
return(CPP_LINE);
}
<C>{identifier} {
ScanKeyword *keyword;
keyword = ScanCKeywordLookup((char*)yytext);
if (keyword != NULL) {
return keyword->value;
}
else
{
struct _defines *ptr;
for (ptr = defines; ptr; ptr = ptr->next)
{
if (strcmp(yytext, ptr->old) == 0)
{
struct _yy_buffer *yb;
yb = mm_alloc(sizeof(struct _yy_buffer));
yb->buffer = YY_CURRENT_BUFFER;
yb->lineno = yylineno;
yb->filename = mm_strdup(input_filename);
yb->next = yy_buffer;
yy_buffer = yb;
yy_scan_string(ptr->new);
break;
}
}
if (ptr == NULL)
{
yylval.str = mm_strdup((char*)yytext);
return IDENT;
}
}
}
<C>";" { return(';'); }
<C>"," { return(','); }
<C>"*" { return('*'); }
<C>"%" { return('%'); }
<C>"/" { return('/'); }
<C>"+" { return('+'); }
<C>"-" { return('-'); }
<C>"(" { return('('); }
<C>")" { return(')'); }
<C>{space_or_nl} { ECHO; }
<C>\{ { return('{'); }
<C>\} { return('}'); }
<C>\[ { return('['); }
<C>\] { return(']'); }
<C>\= { return('='); }
<C>{other} { return S_ANYTHING; }
<C>{exec_sql}{define}{space_or_nl}* { BEGIN(def_ident); }
<C>{exec_sql}{include}{space_or_nl}* { BEGIN(incl); }
<C,xskip>{exec_sql}{ifdef}{space_or_nl}* { ifcond = TRUE; BEGIN(xcond); }
<C,xskip>{exec_sql}{ifndef}{space_or_nl}* { ifcond = FALSE; BEGIN(xcond); }
<C,xskip>{exec_sql}{elif}{space_or_nl}* { /* pop stack */
if ( preproc_tos == 0 ) {
mmerror(ET_FATAL, "Missing matching 'EXEC SQL IFDEF / EXEC SQL IFNDEF'");
}
else if ( stacked_if_value[preproc_tos].else_branch ) {
mmerror(ET_FATAL, "Missing 'EXEC SQL ENDIF;'");
}
else {
preproc_tos--;
}
ifcond = TRUE; BEGIN(xcond);
}
<C,xskip>{exec_sql}{else}{space_or_nl}*";" { /* only exec sql endif pops the stack, so take care of duplicated 'else' */
if ( stacked_if_value[preproc_tos].else_branch ) {
mmerror(ET_FATAL, "Duplicated 'EXEC SQL ELSE;'");
}
else {
stacked_if_value[preproc_tos].else_branch = TRUE;
stacked_if_value[preproc_tos].condition =
(stacked_if_value[preproc_tos-1].condition &&
! stacked_if_value[preproc_tos].condition);
if ( stacked_if_value[preproc_tos].condition ) {
BEGIN(C);
}
else {
BEGIN(xskip);
}
}
}
<C,xskip>{exec_sql}{endif}{space_or_nl}*";" {
if ( preproc_tos == 0 ) {
mmerror(ET_FATAL, "Unmatched 'EXEC SQL ENDIF;'");
}
else {
preproc_tos--;
}
if ( stacked_if_value[preproc_tos].condition ) {
BEGIN(C);
}
else {
BEGIN(xskip);
}
}
<xskip>{other} { /* ignore */ }
<xcond>{identifier}{space_or_nl}*";" {
if ( preproc_tos >= MAX_NESTED_IF-1 ) {
mmerror(ET_FATAL, "Too many nested 'EXEC SQL IFDEF' conditions");
}
else {
struct _defines *defptr;
unsigned int i;
/* skip the ";" and trailing whitespace. Note that yytext contains
at least one non-space character plus the ";" */
for ( i = strlen(yytext)-2; i > 0 && isspace((int) yytext[i]); i-- ) {}
yytext[i+1] = '\0';
for ( defptr = defines; defptr != NULL &&
( strcmp((char*)yytext, defptr->old) != 0 ); defptr = defptr->next );
preproc_tos++;
stacked_if_value[preproc_tos].else_branch = FALSE;
stacked_if_value[preproc_tos].condition =
( (defptr ? ifcond : !ifcond) && stacked_if_value[preproc_tos-1].condition );
}
if ( stacked_if_value[preproc_tos].condition ) {
BEGIN C;
}
else {
BEGIN(xskip);
}
}
<def_ident>{identifier} {
old = mm_strdup(yytext);
BEGIN(def);
startlit();
}
<def>{space_or_nl}*";" {
struct _defines *ptr, *this;
for (ptr = defines; ptr != NULL; ptr = ptr->next)
{
if (strcmp(old, ptr->old) == 0)
{
free(ptr->new);
/* ptr->new = mm_strdup(scanstr(literalbuf));*/
ptr->new = mm_strdup(literalbuf);
}
}
if (ptr == NULL)
{
this = (struct _defines *) mm_alloc(sizeof(struct _defines));
/* initial definition */
this->old = old;
/* this->new = mm_strdup(scanstr(literalbuf));*/
this->new = mm_strdup(literalbuf);
this->next = defines;
defines = this;
}
BEGIN(C);
}
<def>[^";"] {
addlit(yytext, yyleng);
}
<incl>[^";"]+";" { /* got the include file name */
struct _yy_buffer *yb;
struct _include_path *ip;
char inc_file[MAXPGPATH];
unsigned int i;
yb = mm_alloc(sizeof(struct _yy_buffer));
yb->buffer = YY_CURRENT_BUFFER;
yb->lineno = yylineno;
yb->filename = input_filename;
yb->next = yy_buffer;
yy_buffer = yb;
/* skip the ";" and trailing whitespace. Note that yytext contains
at least one non-space character plus the ";" */
for ( i = strlen(yytext)-2; i > 0 && isspace((int) yytext[i]); i-- ) {}
yytext[i+1] = '\0';
yyin = NULL;
for (ip = include_paths; yyin == NULL && ip != NULL; ip = ip->next)
{
if (strlen(ip->path) + strlen(yytext) + 3 > MAXPGPATH)
{
fprintf(stderr, "Error: Path %s/%s is too long in line %d, skipping.\n", ip->path, yytext, yylineno);
continue;
}
sprintf (inc_file, "%s/%s", ip->path, yytext);
yyin = fopen( inc_file, "r" );
if (!yyin)
{
if (strcmp(inc_file + strlen(inc_file) - 2, ".h"))
{
strcat(inc_file, ".h");
yyin = fopen( inc_file, "r" );
}
}
}
if (!yyin)
{
fprintf(stderr, "Error: Cannot open include file %s in line %d\n", yytext, yylineno);
exit(NO_INCLUDE_FILE);
}
input_filename = mm_strdup(inc_file);
yy_switch_to_buffer(yy_create_buffer(yyin,YY_BUF_SIZE ));
yylineno = 1;
output_line_number();
BEGIN C;
}
<<EOF>> {
if ( preproc_tos > 0 ) {
preproc_tos = 0;
mmerror(ET_FATAL, "Missing 'EXEC SQL ENDIF;'");
}
if (yy_buffer == NULL)
yyterminate();
else
{
struct _yy_buffer *yb = yy_buffer;
if (yyin != NULL)
fclose(yyin);
yy_delete_buffer( YY_CURRENT_BUFFER );
yy_switch_to_buffer(yy_buffer->buffer);
yylineno = yy_buffer->lineno;
free(input_filename);
input_filename = yy_buffer->filename;
yy_buffer = yy_buffer->next;
free(yb);
output_line_number();
}
}
%%
void
lex_init(void)
{
braces_open = 0;
preproc_tos = 0;
yylineno = 0;
ifcond = TRUE;
stacked_if_value[preproc_tos].condition = ifcond;
stacked_if_value[preproc_tos].else_branch = FALSE;
/* initialize literal buffer to a reasonable but expansible size */
if (literalbuf == NULL)
{
literalalloc = 128;
literalbuf = (char *) malloc(literalalloc);
}
startlit();
BEGIN C;
}
static void
addlit(char *ytext, int yleng)
{
/* enlarge buffer if needed */
if ((literallen+yleng) >= literalalloc)
{
do {
literalalloc *= 2;
} while ((literallen+yleng) >= literalalloc);
literalbuf = (char *) realloc(literalbuf, literalalloc);
}
/* append data --- note we assume ytext is null-terminated */
memcpy(literalbuf+literallen, ytext, yleng+1);
literallen += yleng;
}
int yywrap(void)
{
return 1;
}
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