opensourcemirror
/
postgresql
mirror of git://git.postgresql.org/git/postgresql.git
1
0
Fork 0
Code Issues Releases Wiki Activity
postgresql/src/interfaces/ecpg/preproc/pgc.l

1687 lines
42 KiB
Plaintext
Raw Blame History

%top{
/*-------------------------------------------------------------------------
*
* pgc.l
* lexical scanner for ecpg
*
* This is a modified version of src/backend/parser/scan.l
*
* The ecpg scanner is not backup-free, so the fail rules are
* only here to simplify syncing this file with scan.l.
*
*
* Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/interfaces/ecpg/preproc/pgc.l
*
*-------------------------------------------------------------------------
*/
#include "postgres_fe.h"
#include <ctype.h>
#include <limits.h>
#include "common/string.h"
#include "preproc_extern.h"
#include "preproc.h"
}
%{
/* LCOV_EXCL_START */
extern YYSTYPE base_yylval;
static int xcdepth = 0; /* depth of nesting in slash-star comments */
static char *dolqstart = NULL; /* current $foo$ quote start string */
/*
* 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 */
/* Used for detecting global state together with braces_open */
static int parenths_open;
/* Used to tell parse_include() whether the command was #include or #include_next */
static bool include_next;
#define startlit() (literalbuf[0] = '\0', literallen = 0)
static void addlit(char *ytext, int yleng);
static void addlitchar(unsigned char);
static int process_integer_literal(const char *token, YYSTYPE *lval);
static void parse_include(void);
static bool ecpg_isspace(char ch);
static bool isdefine(void);
static bool isinformixdefine(void);
char *token_start;
/* vars to keep track of start conditions when scanning literals */
static int state_before_str_start;
static int state_before_str_stop;
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 8bit
%option never-interactive
%option nodefault
%option noinput
%option noyywrap
%option warn
%option yylineno
%option prefix="base_yy"
/*
* 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> bit string literal
* <xc> extended C-style comments
* <xd> delimited identifiers (double-quoted identifiers)
* <xdc> double-quoted strings in C
* <xh> hexadecimal numeric string
* <xn> national character quoted strings
* <xq> standard quoted strings
* <xqs> quote stop (detect continued strings)
* <xe> extended quoted strings (support backslash escape sequences)
* <xqc> single-quoted strings in C
* <xdolq> $foo$ quoted strings
* <xui> quoted identifier with Unicode escapes
* <xus> quoted string with Unicode escapes
* <xcond> condition of an EXEC SQL IFDEF construct
* <xskip> skipping the inactive part of an EXEC SQL IFDEF construct
*
* Note: we intentionally don't mimic the backend's <xeu> state; we have
* no need to distinguish it from <xe> state.
*
* Remember to add an <<EOF>> case whenever you add a new exclusive state!
* The default one is probably not the right thing.
*/
%x xb
%x xc
%x xd
%x xdc
%x xh
%x xn
%x xq
%x xqs
%x xe
%x xqc
%x xdolq
%x xui
%x xus
%x xcond
%x xskip
/* Additional exclusive states that are specific to ECPG */
%x C SQL incl def def_ident undef
/*
* 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. SQL-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?
*
* XXX if you change the set of whitespace characters, fix ecpg_isspace()
* to agree.
*/
space [ \t\n\r\f]
horiz_space [ \t\f]
newline [\n\r]
non_newline [^\n\r]
comment ("--"{non_newline}*)
whitespace ({space}+|{comment})
/*
* SQL 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}*)
quote '
/* If we see {quote} then {quotecontinue}, the quoted string continues */
quotecontinue {whitespace_with_newline}{quote}
/*
* {quotecontinuefail} is needed to avoid lexer backup when we fail to match
* {quotecontinue}. It might seem that this could just be {whitespace}*,
* but if there's a dash after {whitespace_with_newline}, it must be consumed
* to see if there's another dash --- which would start a {comment} and thus
* allow continuation of the {quotecontinue} token.
*/
quotecontinuefail {whitespace}*"-"?
/* Bit string
*/
xbstart [bB]{quote}
xbinside [^']*
/* Hexadecimal number */
xhstart [xX]{quote}
xhinside [^']*
/* National character */
xnstart [nN]{quote}
/* Quoted string that allows backslash escapes */
xestart [eE]{quote}
xeinside [^\\']+
xeescape [\\][^0-7]
xeoctesc [\\][0-7]{1,3}
xehexesc [\\]x[0-9A-Fa-f]{1,2}
xeunicode [\\](u[0-9A-Fa-f]{4}|U[0-9A-Fa-f]{8})
/* Extended quote
* xqdouble implements embedded quote, ''''
*/
xqstart {quote}
xqdouble {quote}{quote}
xqcquote [\\]{quote}
xqinside [^']+
/* $foo$ style quotes ("dollar quoting")
* The quoted string starts with $foo$ where "foo" is an optional string
* in the form of an identifier, except that it may not contain "$",
* and extends to the first occurrence of an identical string.
* There is *no* processing of the quoted text.
*
* {dolqfailed} is an error rule to avoid scanner backup when {dolqdelim}
* fails to match its trailing "$".
*/
dolq_start [A-Za-z\200-\377_]
dolq_cont [A-Za-z\200-\377_0-9]
dolqdelim \$({dolq_start}{dolq_cont}*)?\$
dolqfailed \${dolq_start}{dolq_cont}*
dolqinside [^$]+
/* Double quote
* Allows embedded spaces and other special characters into identifiers.
*/
dquote \"
xdstart {dquote}
xdstop {dquote}
xddouble {dquote}{dquote}
xdinside [^"]+
/* Quoted identifier with Unicode escapes */
xuistart [uU]&{dquote}
/* Quoted string with Unicode escapes */
xusstart [uU]&{quote}
/* 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.
* Dash-dash comments have similar interactions with the operator rule.
*/
xcstart \/\*{op_chars}*
xcstop \*+\/
xcinside [^*/]+
digit [0-9]
ident_start [A-Za-z\200-\377_]
ident_cont [A-Za-z\200-\377_0-9\$]
identifier {ident_start}{ident_cont}*
array ({ident_cont}|{whitespace}|[\[\]\+\-\*\%\/\(\)\>\.])*
/* Assorted special-case operators and operator-like tokens */
typecast "::"
dot_dot \.\.
colon_equals ":="
/*
* These operator-like tokens (unlike the above ones) also match the {operator}
* rule, which means that they might be overridden by a longer match if they
* are followed by a comment start or a + or - character. Accordingly, if you
* add to this list, you must also add corresponding code to the {operator}
* block to return the correct token in such cases. (This is not needed in
* psqlscan.l since the token value is ignored there.)
*/
equals_greater "=>"
less_equals "<="
greater_equals ">="
less_greater "<>"
not_equals "!="
/*
* "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
*
* {decimalfail} is used because we would like "1..10" to lex as 1, dot_dot, 10.
*
* {realfail1} and {realfail2} are added to prevent the need for scanner
* backup when the {real} rule fails to match completely.
*/
integer {digit}+
decimal (({digit}*\.{digit}+)|({digit}+\.{digit}*))
decimalfail {digit}+\.\.
real ({integer}|{decimal})[Ee][-+]?{digit}+
realfail1 ({integer}|{decimal})[Ee]
realfail2 ({integer}|{decimal})[Ee][-+]
param \${integer}
/* special characters for other dbms */
/* we have to react differently in compat mode */
informix_special [\$]
other .
/*
* Dollar quoted strings are totally opaque, and no escaping is done on them.
* Other quoted strings must allow some special characters such as single-quote
* and newline.
* Embedded single-quotes are implemented both in the SQL 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.
* Note that xcstart must appear before operator, as explained above!
* Also whitespace (comment) must appear before operator.
*/
/* 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]
include_next [iI][nN][cC][lL][uU][dD][eE]_[nN][eE][xX][tT]
import [iI][mM][pP][oO][rR][tT]
undef [uU][nN][dD][eE][fF]
/* C version of hex number */
xch 0[xX][0-9A-Fa-f]*
ccomment "//".*\n
if [iI][fF]
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]
struct [sS][tT][rR][uU][cC][tT]
exec_sql {exec}{space}*{sql}{space}*
ipdigit ({digit}|{digit}{digit}|{digit}{digit}{digit})
ip {ipdigit}\.{ipdigit}\.{ipdigit}\.{ipdigit}
/* we might want to parse all cpp include files */
cppinclude {space}*#{include}{space}*
cppinclude_next {space}*#{include_next}{space}*
/* take care of cpp lines, they may also be continued */
/* first a general line for all commands not starting with "i" */
/* and then the other commands starting with "i", we have to add these
* separately because the cppline production would match on "include" too
*/
cppline {space}*#([^i][A-Za-z]*|{if}|{ifdef}|{ifndef}|{import})((\/\*[^*/]*\*+\/)|.|\\{space}*{newline})*{newline}
%%
%{
/* code to execute during start of each call of yylex() */
token_start = NULL;
%}
<SQL>{
{whitespace} {
/* ignore */
}
} /* <SQL> */
<C,SQL>{
{xcstart} {
token_start = yytext;
state_before_str_start = YYSTATE;
xcdepth = 0;
BEGIN(xc);
/* Put back any characters past slash-star; see above */
yyless(2);
fputs("/*", yyout);
}
} /* <C,SQL> */
<xc>{
{xcstart} {
if (state_before_str_start == SQL)
{
xcdepth++;
/* Put back any characters past slash-star; see above */
yyless(2);
fputs("/_*", yyout);
}
else if (state_before_str_start == C)
{
ECHO;
}
}
{xcstop} {
if (state_before_str_start == SQL)
{
if (xcdepth <= 0)
{
ECHO;
BEGIN(SQL);
token_start = NULL;
}
else
{
xcdepth--;
fputs("*_/", yyout);
}
}
else if (state_before_str_start == C)
{
ECHO;
BEGIN(C);
token_start = NULL;
}
}
{xcinside} {
ECHO;
}
{op_chars} {
ECHO;
}
\*+ {
ECHO;
}
<<EOF>> {
mmfatal(PARSE_ERROR, "unterminated /* comment");
}
} /* <xc> */
<SQL>{
{xbstart} {
token_start = yytext;
BEGIN(xb);
startlit();
addlitchar('b');
}
} /* <SQL> */
<xh>{xhinside} |
<xb>{xbinside} {
addlit(yytext, yyleng);
}
<xb><<EOF>> { mmfatal(PARSE_ERROR, "unterminated bit string literal"); }
<SQL>{xhstart} {
token_start = yytext;
BEGIN(xh);
startlit();
addlitchar('x');
}
<xh><<EOF>> { mmfatal(PARSE_ERROR, "unterminated hexadecimal string literal"); }
<C>{xqstart} {
token_start = yytext;
state_before_str_start = YYSTATE;
BEGIN(xqc);
startlit();
}
<SQL>{
{xnstart} {
/* National character.
* Transfer it as-is to the backend.
*/
token_start = yytext;
state_before_str_start = YYSTATE;
BEGIN(xn);
startlit();
}
{xqstart} {
token_start = yytext;
state_before_str_start = YYSTATE;
BEGIN(xq);
startlit();
}
{xestart} {
token_start = yytext;
state_before_str_start = YYSTATE;
BEGIN(xe);
startlit();
}
{xusstart} {
token_start = yytext;
state_before_str_start = YYSTATE;
BEGIN(xus);
startlit();
}
} /* <SQL> */
<xb,xh,xq,xqc,xe,xn,xus>{quote} {
/*
* When we are scanning a quoted string and see an end
* quote, we must look ahead for a possible continuation.
* If we don't see one, we know the end quote was in fact
* the end of the string. To reduce the lexer table size,
* we use a single "xqs" state to do the lookahead for all
* types of strings.
*/
state_before_str_stop = YYSTATE;
BEGIN(xqs);
}
<xqs>{quotecontinue} {
/*
* Found a quote continuation, so return to the in-quote
* state and continue scanning the literal. Nothing is
* added to the literal's contents.
*/
BEGIN(state_before_str_stop);
}
<xqs>{quotecontinuefail} |
<xqs>{other} |
<xqs><<EOF>> {
/*
* Failed to see a quote continuation. Throw back
* everything after the end quote, and handle the string
* according to the state we were in previously.
*/
yyless(0);
BEGIN(state_before_str_start);
switch (state_before_str_stop)
{
case xb:
if (literalbuf[strspn(literalbuf, "01") + 1] != '\0')
mmerror(PARSE_ERROR, ET_ERROR, "invalid bit string literal");
base_yylval.str = mm_strdup(literalbuf);
return BCONST;
case xh:
base_yylval.str = mm_strdup(literalbuf);
return XCONST;
case xq:
/* fallthrough */
case xqc:
base_yylval.str = psprintf("'%s'", literalbuf);
return SCONST;
case xe:
base_yylval.str = psprintf("E'%s'", literalbuf);
return SCONST;
case xn:
base_yylval.str = psprintf("N'%s'", literalbuf);
return SCONST;
case xus:
base_yylval.str = psprintf("U&'%s'", literalbuf);
return USCONST;
default:
mmfatal(PARSE_ERROR, "unhandled previous state in xqs\n");
}
}
<xq,xe,xn,xus>{xqdouble} { addlitchar('\''); }
<xqc>{xqcquote} {
addlitchar('\\');
addlitchar('\'');
}
<xq,xqc,xn,xus>{xqinside} { addlit(yytext, yyleng); }
<xe>{xeinside} {
addlit(yytext, yyleng);
}
<xe>{xeunicode} {
addlit(yytext, yyleng);
}
<xe>{xeescape} {
addlit(yytext, yyleng);
}
<xe>{xeoctesc} {
addlit(yytext, yyleng);
}
<xe>{xehexesc} {
addlit(yytext, yyleng);
}
<xe>. {
/* This is only needed for \ just before EOF */
addlitchar(yytext[0]);
}
<xq,xqc,xe,xn,xus><<EOF>> { mmfatal(PARSE_ERROR, "unterminated quoted string"); }
<SQL>{
{dolqdelim} {
token_start = yytext;
if (dolqstart)
free(dolqstart);
dolqstart = mm_strdup(yytext);
BEGIN(xdolq);
startlit();
addlit(yytext, yyleng);
}
{dolqfailed} {
/* throw back all but the initial "$" */
yyless(1);
/* and treat it as {other} */
return yytext[0];
}
} /* <SQL> */
<xdolq>{dolqdelim} {
if (strcmp(yytext, dolqstart) == 0)
{
addlit(yytext, yyleng);
free(dolqstart);
dolqstart = NULL;
BEGIN(SQL);
base_yylval.str = mm_strdup(literalbuf);
return SCONST;
}
else
{
/*
* When we fail to match $...$ to dolqstart, transfer
* the $... part to the output, but put back the final
* $ for rescanning. Consider $delim$...$junk$delim$
*/
addlit(yytext, yyleng - 1);
yyless(yyleng - 1);
}
}
<xdolq>{dolqinside} {
addlit(yytext, yyleng);
}
<xdolq>{dolqfailed} {
addlit(yytext, yyleng);
}
<xdolq>. {
/* single quote or dollar sign */
addlitchar(yytext[0]);
}
<xdolq><<EOF>> { mmfatal(PARSE_ERROR, "unterminated dollar-quoted string"); }
<SQL>{
{xdstart} {
state_before_str_start = YYSTATE;
BEGIN(xd);
startlit();
}
{xuistart} {
state_before_str_start = YYSTATE;
BEGIN(xui);
startlit();
}
} /* <SQL> */
<xd>{xdstop} {
BEGIN(state_before_str_start);
if (literallen == 0)
mmerror(PARSE_ERROR, ET_ERROR, "zero-length delimited identifier");
/* The backend will truncate the identifier here. We do not as it does not change the result. */
base_yylval.str = mm_strdup(literalbuf);
return CSTRING;
}
<xdc>{xdstop} {
BEGIN(state_before_str_start);
base_yylval.str = mm_strdup(literalbuf);
return CSTRING;
}
<xui>{dquote} {
BEGIN(state_before_str_start);
if (literallen == 2) /* "U&" */
mmerror(PARSE_ERROR, ET_ERROR, "zero-length delimited identifier");
/* The backend will truncate the identifier here. We do not as it does not change the result. */
base_yylval.str = psprintf("U&\"%s\"", literalbuf);
return UIDENT;
}
<xd,xui>{xddouble} {
addlitchar('"');
}
<xd,xui>{xdinside} {
addlit(yytext, yyleng);
}
<xd,xui><<EOF>> { mmfatal(PARSE_ERROR, "unterminated quoted identifier"); }
<C>{xdstart} {
state_before_str_start = YYSTATE;
BEGIN(xdc);
startlit();
}
<xdc>{xdcinside} {
addlit(yytext, yyleng);
}
<xdc><<EOF>> { mmfatal(PARSE_ERROR, "unterminated quoted string"); }
<SQL>{
{typecast} {
return TYPECAST;
}
{dot_dot} {
return DOT_DOT;
}
{colon_equals} {
return COLON_EQUALS;
}
{equals_greater} {
return EQUALS_GREATER;
}
{less_equals} {
return LESS_EQUALS;
}
{greater_equals} {
return GREATER_EQUALS;
}
{less_greater} {
/* We accept both "<>" and "!=" as meaning NOT_EQUALS */
return NOT_EQUALS;
}
{not_equals} {
/* We accept both "<>" and "!=" as meaning NOT_EQUALS */
return NOT_EQUALS;
}
{informix_special} {
/* are we simulating Informix? */
if (INFORMIX_MODE)
{
unput(':');
}
else
return yytext[0];
}
{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];
}
{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(yytext, "/*");
char *dashdash = strstr(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 - yytext;
/*
* For SQL compatibility, '+' and '-' cannot be the
* last char of a multi-char operator unless the operator
* contains chars that are not in SQL operators.
* The idea is to lex '=-' as two operators, but not
* to forbid operator names like '?-' that could not be
* sequences of SQL operators.
*/
if (nchars > 1 &&
(yytext[nchars - 1] == '+' ||
yytext[nchars - 1] == '-'))
{
int ic;
for (ic = nchars - 2; ic >= 0; ic--)
{
char c = yytext[ic];
if (c == '~' || c == '!' || c == '@' ||
c == '#' || c == '^' || c == '&' ||
c == '|' || c == '`' || c == '?' ||
c == '%')
break;
}
if (ic < 0)
{
/*
* didn't find a qualifying character, so remove
* all trailing [+-]
*/
do {
nchars--;
} while (nchars > 1 &&
(yytext[nchars - 1] == '+' ||
yytext[nchars - 1] == '-'));
}
}
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];
/*
* Likewise, if what we have left is two chars, and
* those match the tokens ">=", "<=", "=>", "<>" or
* "!=", then we must return the appropriate token
* rather than the generic Op.
*/
if (nchars == 2)
{
if (yytext[0] == '=' && yytext[1] == '>')
return EQUALS_GREATER;
if (yytext[0] == '>' && yytext[1] == '=')
return GREATER_EQUALS;
if (yytext[0] == '<' && yytext[1] == '=')
return LESS_EQUALS;
if (yytext[0] == '<' && yytext[1] == '>')
return NOT_EQUALS;
if (yytext[0] == '!' && yytext[1] == '=')
return NOT_EQUALS;
}
}
base_yylval.str = mm_strdup(yytext);
return Op;
}
{param} {
base_yylval.ival = atol(yytext+1);
return PARAM;
}
{ip} {
base_yylval.str = mm_strdup(yytext);
return IP;
}
} /* <SQL> */
<C,SQL>{
{integer} {
return process_integer_literal(yytext, &base_yylval);
}
{decimal} {
base_yylval.str = mm_strdup(yytext);
return FCONST;
}
{decimalfail} {
/* throw back the .., and treat as integer */
yyless(yyleng - 2);
return process_integer_literal(yytext, &base_yylval);
}
{real} {
base_yylval.str = mm_strdup(yytext);
return FCONST;
}
{realfail1} {
/*
* throw back the [Ee], and figure out whether what
* remains is an {integer} or {decimal}.
*/
yyless(yyleng - 1);
return process_integer_literal(yytext, &base_yylval);
}
{realfail2} {
/* throw back the [Ee][+-], and proceed as above */
yyless(yyleng - 2);
return process_integer_literal(yytext, &base_yylval);
}
} /* <C,SQL> */
<SQL>{
:{identifier}((("->"|\.){identifier})|(\[{array}\]))* {
base_yylval.str = mm_strdup(yytext+1);
return CVARIABLE;
}
{identifier} {
if (!isdefine())
{
int kwvalue;
/* Is it an SQL/ECPG keyword? */
kwvalue = ScanECPGKeywordLookup(yytext);
if (kwvalue >= 0)
return kwvalue;
/* Is it a C keyword? */
kwvalue = ScanCKeywordLookup(yytext);
if (kwvalue >= 0)
return kwvalue;
/*
* None of the above. Return it as an identifier.
*
* The backend will attempt to truncate and case-fold
* the identifier, but I see no good reason for ecpg
* to do so; that's just another way that ecpg could get
* out of step with the backend.
*/
base_yylval.str = mm_strdup(yytext);
return IDENT;
}
}
{other} {
return yytext[0];
}
} /* <SQL> */
/*
* Begin ECPG-specific rules
*/
<C>{exec_sql} { BEGIN(SQL); return SQL_START; }
<C>{informix_special} {
/* are we simulating Informix? */
if (INFORMIX_MODE)
{
BEGIN(SQL);
return SQL_START;
}
else
return S_ANYTHING;
}
<C>{ccomment} { ECHO; }
<C>{xch} {
char* endptr;
errno = 0;
base_yylval.ival = strtoul((char *)yytext,&endptr,16);
if (*endptr != '\0' || errno == ERANGE)
{
errno = 0;
base_yylval.str = mm_strdup(yytext);
return SCONST;
}
return ICONST;
}
<C>{cppinclude} {
if (system_includes)
{
include_next = false;
BEGIN(incl);
}
else
{
base_yylval.str = mm_strdup(yytext);
return CPP_LINE;
}
}
<C>{cppinclude_next} {
if (system_includes)
{
include_next = true;
BEGIN(incl);
}
else
{
base_yylval.str = mm_strdup(yytext);
return CPP_LINE;
}
}
<C,SQL>{cppline} {
base_yylval.str = mm_strdup(yytext);
return CPP_LINE;
}
<C>{identifier} {
/*
* Try to detect a function name:
* look for identifiers at the global scope
* keep the last identifier before the first '(' and '{'
*/
if (braces_open == 0 && parenths_open == 0)
{
if (current_function)
free(current_function);
current_function = mm_strdup(yytext);
}
/* Informix uses SQL defines only in SQL space */
/* however, some defines have to be taken care of for compatibility */
if ((!INFORMIX_MODE || !isinformixdefine()) && !isdefine())
{
int kwvalue;
kwvalue = ScanCKeywordLookup(yytext);
if (kwvalue >= 0)
return kwvalue;
else
{
base_yylval.str = mm_strdup(yytext);
return IDENT;
}
}
}
<C>{xcstop} { mmerror(PARSE_ERROR, ET_ERROR, "nested /* ... */ comments"); }
<C>":" { return ':'; }
<C>";" { return ';'; }
<C>"," { return ','; }
<C>"*" { return '*'; }
<C>"%" { return '%'; }
<C>"/" { return '/'; }
<C>"+" { return '+'; }
<C>"-" { return '-'; }
<C>"(" { parenths_open++; return '('; }
<C>")" { parenths_open--; return ')'; }
<C,xskip>{space} { ECHO; }
<C>\{ { return '{'; }
<C>\} { return '}'; }
<C>\[ { return '['; }
<C>\] { return ']'; }
<C>\= { return '='; }
<C>"->" { return S_MEMBER; }
<C>">>" { return S_RSHIFT; }
<C>"<<" { return S_LSHIFT; }
<C>"||" { return S_OR; }
<C>"&&" { return S_AND; }
<C>"++" { return S_INC; }
<C>"--" { return S_DEC; }
<C>"==" { return S_EQUAL; }
<C>"!=" { return S_NEQUAL; }
<C>"+=" { return S_ADD; }
<C>"-=" { return S_SUB; }
<C>"*=" { return S_MUL; }
<C>"/=" { return S_DIV; }
<C>"%=" { return S_MOD; }
<C>"->*" { return S_MEMPOINT; }
<C>".*" { return S_DOTPOINT; }
<C>{other} { return S_ANYTHING; }
<C>{exec_sql}{define}{space}* { BEGIN(def_ident); }
<C>{informix_special}{define}{space}* {
/* are we simulating Informix? */
if (INFORMIX_MODE)
{
BEGIN(def_ident);
}
else
{
yyless(1);
return S_ANYTHING;
}
}
<C>{exec_sql}{undef}{space}* { BEGIN(undef); }
<C>{informix_special}{undef}{space}* {
/* are we simulating Informix? */
if (INFORMIX_MODE)
{
BEGIN(undef);
}
else
{
yyless(1);
return S_ANYTHING;
}
}
<undef>{identifier}{space}*";" {
struct _defines *ptr, *ptr2 = NULL;
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 && ecpg_isspace(yytext[i]);
i-- )
;
yytext[i+1] = '\0';
for (ptr = defines; ptr != NULL; ptr2 = ptr, ptr = ptr->next)
{
if (strcmp(yytext, ptr->olddef) == 0)
{
if (ptr2 == NULL)
defines = ptr->next;
else
ptr2->next = ptr->next;
free(ptr->newdef);
free(ptr->olddef);
free(ptr);
break;
}
}
BEGIN(C);
}
<undef>{other}|\n {
mmfatal(PARSE_ERROR, "missing identifier in EXEC SQL UNDEF command");
yyterminate();
}
<C>{exec_sql}{include}{space}* { BEGIN(incl); }
<C>{informix_special}{include}{space}* {
/* are we simulating Informix? */
if (INFORMIX_MODE)
{
BEGIN(incl);
}
else
{
yyless(1);
return S_ANYTHING;
}
}
<C,xskip>{exec_sql}{ifdef}{space}* { ifcond = true; BEGIN(xcond); }
<C,xskip>{informix_special}{ifdef}{space}* {
/* are we simulating Informix? */
if (INFORMIX_MODE)
{
ifcond = true;
BEGIN(xcond);
}
else
{
yyless(1);
return S_ANYTHING;
}
}
<C,xskip>{exec_sql}{ifndef}{space}* { ifcond = false; BEGIN(xcond); }
<C,xskip>{informix_special}{ifndef}{space}* {
/* are we simulating Informix? */
if (INFORMIX_MODE)
{
ifcond = false;
BEGIN(xcond);
}
else
{
yyless(1);
return S_ANYTHING;
}
}
<C,xskip>{exec_sql}{elif}{space}* { /* pop stack */
if ( preproc_tos == 0 ) {
mmfatal(PARSE_ERROR, "missing matching \"EXEC SQL IFDEF\" / \"EXEC SQL IFNDEF\"");
}
else if ( stacked_if_value[preproc_tos].else_branch )
mmfatal(PARSE_ERROR, "missing \"EXEC SQL ENDIF;\"");
else
preproc_tos--;
ifcond = true; BEGIN(xcond);
}
<C,xskip>{informix_special}{elif}{space}* {
/* are we simulating Informix? */
if (INFORMIX_MODE)
{
if (preproc_tos == 0)
mmfatal(PARSE_ERROR, "missing matching \"EXEC SQL IFDEF\" / \"EXEC SQL IFNDEF\"");
else if (stacked_if_value[preproc_tos].else_branch)
mmfatal(PARSE_ERROR, "missing \"EXEC SQL ENDIF;\"");
else
preproc_tos--;
ifcond = true;
BEGIN(xcond);
}
else
{
yyless(1);
return S_ANYTHING;
}
}
<C,xskip>{exec_sql}{else}{space}*";" { /* only exec sql endif pops the stack, so take care of duplicated 'else' */
if (stacked_if_value[preproc_tos].else_branch)
mmfatal(PARSE_ERROR, "more than one 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>{informix_special}{else}{space}*";" {
/* are we simulating Informix? */
if (INFORMIX_MODE)
{
if (stacked_if_value[preproc_tos].else_branch)
mmfatal(PARSE_ERROR, "more than one 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);
}
}
else
{
yyless(1);
return S_ANYTHING;
}
}
<C,xskip>{exec_sql}{endif}{space}*";" {
if (preproc_tos == 0)
mmfatal(PARSE_ERROR, "unmatched EXEC SQL ENDIF");
else
preproc_tos--;
if (stacked_if_value[preproc_tos].condition)
BEGIN(C);
else
BEGIN(xskip);
}
<C,xskip>{informix_special}{endif}{space}*";" {
/* are we simulating Informix? */
if (INFORMIX_MODE)
{
if (preproc_tos == 0)
mmfatal(PARSE_ERROR, "unmatched EXEC SQL ENDIF");
else
preproc_tos--;
if (stacked_if_value[preproc_tos].condition)
BEGIN(C);
else
BEGIN(xskip);
}
else
{
yyless(1);
return S_ANYTHING;
}
}
<xskip>{other} { /* ignore */ }
<xcond>{identifier}{space}*";" {
if (preproc_tos >= MAX_NESTED_IF-1)
mmfatal(PARSE_ERROR, "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 && ecpg_isspace(yytext[i]);
i-- )
;
yytext[i+1] = '\0';
for (defptr = defines;
defptr != NULL &&
strcmp(yytext, defptr->olddef) != 0;
defptr = defptr->next)
/* skip */ ;
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);
}
<xcond>{other}|\n {
mmfatal(PARSE_ERROR, "missing identifier in EXEC SQL IFDEF command");
yyterminate();
}
<def_ident>{identifier} {
old = mm_strdup(yytext);
BEGIN(def);
startlit();
}
<def_ident>{other}|\n {
mmfatal(PARSE_ERROR, "missing identifier in EXEC SQL DEFINE command");
yyterminate();
}
<def>{space}*";" {
struct _defines *ptr, *this;
for (ptr = defines; ptr != NULL; ptr = ptr->next)
{
if (strcmp(old, ptr->olddef) == 0)
{
free(ptr->newdef);
ptr->newdef = mm_strdup(literalbuf);
}
}
if (ptr == NULL)
{
this = (struct _defines *) mm_alloc(sizeof(struct _defines));
/* initial definition */
this->olddef = old;
this->newdef = mm_strdup(literalbuf);
this->next = defines;
this->used = NULL;
defines = this;
}
BEGIN(C);
}
<def>[^;] { addlit(yytext, yyleng); }
<incl>\<[^\>]+\>{space}*";"? { parse_include(); }
<incl>{dquote}{xdinside}{dquote}{space}*";"? { parse_include(); }
<incl>[^;\<\>\"]+";" { parse_include(); }
<incl>{other}|\n {
mmfatal(PARSE_ERROR, "syntax error in EXEC SQL INCLUDE command");
yyterminate();
}
<<EOF>> {
if (yy_buffer == NULL)
{
if ( preproc_tos > 0 )
{
preproc_tos = 0;
mmfatal(PARSE_ERROR, "missing \"EXEC SQL ENDIF;\"");
}
yyterminate();
}
else
{
struct _yy_buffer *yb = yy_buffer;
int i;
struct _defines *ptr;
for (ptr = defines; ptr; ptr = ptr->next)
if (ptr->used == yy_buffer)
{
ptr->used = NULL;
break;
}
if (yyin != NULL)
fclose(yyin);
yy_delete_buffer( YY_CURRENT_BUFFER );
yy_switch_to_buffer(yy_buffer->buffer);
yylineno = yy_buffer->lineno;
/* We have to output the filename only if we change files here */
i = strcmp(input_filename, yy_buffer->filename);
free(input_filename);
input_filename = yy_buffer->filename;
yy_buffer = yy_buffer->next;
free(yb);
if (i != 0)
output_line_number();
}
}
<INITIAL>{other}|\n { mmfatal(PARSE_ERROR, "internal error: unreachable state; please report this to <pgsql-bugs@lists.postgresql.org>"); }
%%
/* LCOV_EXCL_STOP */
void
lex_init(void)
{
braces_open = 0;
parenths_open = 0;
current_function = NULL;
preproc_tos = 0;
yylineno = 1;
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 = 1024;
literalbuf = (char *) mm_alloc(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 new data, add trailing null */
memcpy(literalbuf+literallen, ytext, yleng);
literallen += yleng;
literalbuf[literallen] = '\0';
}
static void
addlitchar(unsigned char ychar)
{
/* enlarge buffer if needed */
if ((literallen+1) >= literalalloc)
{
literalalloc *= 2;
literalbuf = (char *) realloc(literalbuf, literalalloc);
}
/* append new data, add trailing null */
literalbuf[literallen] = ychar;
literallen += 1;
literalbuf[literallen] = '\0';
}
/*
* Process {integer}. Note this will also do the right thing with {decimal},
* ie digits and a decimal point.
*/
static int
process_integer_literal(const char *token, YYSTYPE *lval)
{
int val;
char *endptr;
errno = 0;
val = strtoint(token, &endptr, 10);
if (*endptr != '\0' || errno == ERANGE)
{
/* integer too large (or contains decimal pt), treat it as a float */
lval->str = mm_strdup(token);
return FCONST;
}
lval->ival = val;
return ICONST;
}
static void
parse_include(void)
{
/* 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 ";" if there is one and trailing whitespace. Note that
* yytext contains at least one non-space character plus the ";"
*/
for (i = strlen(yytext)-2;
i > 0 && ecpg_isspace(yytext[i]);
i--)
;
if (yytext[i] == ';')
i--;
yytext[i+1] = '\0';
yyin = NULL;
/* If file name is enclosed in '"' remove these and look only in '.' */
/* Informix does look into all include paths though, except filename starts with '/' */
if (yytext[0] == '"' && yytext[i] == '"' &&
((compat != ECPG_COMPAT_INFORMIX && compat != ECPG_COMPAT_INFORMIX_SE) || yytext[1] == '/'))
{
yytext[i] = '\0';
memmove(yytext, yytext+1, strlen(yytext));
strlcpy(inc_file, yytext, sizeof(inc_file));
yyin = fopen(inc_file, "r");
if (!yyin)
{
if (strlen(inc_file) <= 2 || strcmp(inc_file + strlen(inc_file) - 2, ".h") != 0)
{
strcat(inc_file, ".h");
yyin = fopen(inc_file, "r");
}
}
}
else
{
if ((yytext[0] == '"' && yytext[i] == '"') || (yytext[0] == '<' && yytext[i] == '>'))
{
yytext[i] = '\0';
memmove(yytext, yytext+1, strlen(yytext));
}
for (ip = include_paths; yyin == NULL && ip != NULL; ip = ip->next)
{
if (strlen(ip->path) + strlen(yytext) + 4 > MAXPGPATH)
{
fprintf(stderr, _("Error: include path \"%s/%s\" is too long on line %d, skipping\n"), ip->path, yytext, yylineno);
continue;
}
snprintf (inc_file, sizeof(inc_file), "%s/%s", ip->path, yytext);
yyin = fopen(inc_file, "r");
if (!yyin)
{
if (strcmp(inc_file + strlen(inc_file) - 2, ".h") != 0)
{
strcat(inc_file, ".h");
yyin = fopen( inc_file, "r" );
}
}
/* if the command was "include_next" we have to disregard the first hit */
if (yyin && include_next)
{
fclose (yyin);
yyin = NULL;
include_next = false;
}
}
}
if (!yyin)
mmfatal(NO_INCLUDE_FILE, "could not open include file \"%s\" on line %d", yytext, yylineno);
input_filename = mm_strdup(inc_file);
yy_switch_to_buffer(yy_create_buffer(yyin,YY_BUF_SIZE ));
yylineno = 1;
output_line_number();
BEGIN(C);
}
/*
* ecpg_isspace() --- return true if flex scanner considers char whitespace
*/
static bool
ecpg_isspace(char ch)
{
if (ch == ' ' ||
ch == '\t' ||
ch == '\n' ||
ch == '\r' ||
ch == '\f')
return true;
return false;
}
static bool isdefine(void)
{
struct _defines *ptr;
/* is it a define? */
for (ptr = defines; ptr; ptr = ptr->next)
{
if (strcmp(yytext, ptr->olddef) == 0 && ptr->used == NULL)
{
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;
ptr->used = yy_buffer = yb;
yy_scan_string(ptr->newdef);
return true;
}
}
return false;
}
static bool isinformixdefine(void)
{
const char *new = NULL;
if (strcmp(yytext, "dec_t") == 0)
new = "decimal";
else if (strcmp(yytext, "intrvl_t") == 0)
new = "interval";
else if (strcmp(yytext, "dtime_t") == 0)
new = "timestamp";
if (new)
{
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(new);
return true;
}
return false;
}
Reference in New Issue View Git Blame Copy Permalink