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|
%{
#include "xpp.h"
/*
* Lexical definition for the first pass of the IRAF subset preprocessor.
* This program is a horrible kludge but will suffice until there is time
* to build something better.
*/
#undef output /* undefine LEX output macro -- we use proc */
#undef ECHO /* ditto echo */
#define ECHO outstr (yytext)
#define OCTAL 8
#define HEX 16
#define CHARCON 1
extern int linenum[]; /* line numbers in files */
extern int istkptr; /* istk pointer */
extern int str_idnum; /* for ST0000 string names */
extern int nbrace; /* count of braces */
extern int nswitch; /* number of "switch" stmts */
extern int errflag; /* set if compiler error */
extern int errchk; /* sef if error checking */
extern int context; /* lexical context flags */
static int dtype; /* set if typed procedure */
%}
D [0-9]
O [0-7]
S [ 0-6]{D}
X [0-9A-F]
W [ \t]
NI [^a-zA-Z0-9_]
%a 5000
%o 9000
%k 500
%%
^"bool"/{NI} typespec (XTY_BOOL);
^"char"/{NI} typespec (XTY_CHAR);
^"short"/{NI} typespec (XTY_SHORT);
^"int"/{NI} typespec (XTY_INT);
^"long"/{NI} typespec (XTY_LONG);
^"real"/{NI} typespec (XTY_REAL);
^"double"/{NI} typespec (XTY_DOUBLE);
^"complex"/{NI} typespec (XTY_COMPLEX);
^"pointer"/{NI} typespec (XTY_POINTER);
^"extern"/{NI} typespec (XTY_EXTERN);
^{W}*"procedure"/{NI} {
/* Subroutine declaration. */
pushcontext (PROCSTMT);
d_gettok (yytext, YYLMAX-1);
d_newproc (yytext, 0);
}
"procedure"/{NI} {
/* Function declaration. */
pushcontext (PROCSTMT);
d_gettok (yytext, YYLMAX-1);
d_newproc (yytext, dtype);
}
^{W}*"task"/{NI} { if (context & BODY)
ECHO;
else {
process_task_statement();
setline();
}
}
^{W}*"TN$DECL" put_dictionary();
^{W}*"TN$INTERP" put_interpreter();
^".""help" {
skip_helpblock();
setline();
}
^{W}*"begin"/{NI} {
begin_code();
setline();
}
^{W}*"define"{W}+[A-Z0-9_]+{W}+\" {
str_enter();
}
^{W}*("(")?"define"/{NI} {
pushcontext (DEFSTMT);
ECHO;
}
^{W}*"end"/{NI} {
end_code();
}
^{W}*"string"/{NI} {
(context & BODY) ? ECHO
: do_string ('"', STR_DECL);
}
^{W}*"data"/{NI} {
if (!(context & BODY))
pushcontext (DATASTMT);
ECHO;
}
"switch"/{NI} {
ECHO;
if (context & BODY)
nswitch++;
}
"#" skipnl();
^"%"[^\n]* ECHO;
^{W}*"include"{W}*(\"|<) do_include();
[a-zA-Z][a-zA-Z0-9_$]* mapident();
{D}+":"{S}(":"{S})?("."{D}*)? hms (yytext);
{O}+("B"|"b") int_constant (yytext, OCTAL);
{X}+("X"|"x") int_constant (yytext, HEX);
\' int_constant (yytext, CHARCON);
"()" {
if (context & (BODY|PROCSTMT))
ECHO;
}
"&&" output ('&');
"||" output ('|');
"{" {
ECHO;
nbrace++;
}
"}" {
ECHO;
nbrace--;
}
"[" output ('(');
"]" output (')');
\*\" do_hollerith();
\" {
if (context & BODY)
do_string ('"', STR_INLINE);
else
ECHO;
}
(","|";"){W}*("#"[^\n]*)?"\n" {
/* If statement is continued do not pop
* the context.
*/
ECHO;
linenum[istkptr]++;
}
"\n" {
/* End of newline and end of statement.
*/
ECHO;
linenum[istkptr]++;
popcontext();
}
%%
/* TYPESPEC -- Context dependent processing of a type specifier. If in the
* declarations section, process a declarations statement. If in procedure
* body or in a define statement, map the type specifier identifer and output
* the mapped value (intrinsic function name). Otherwise we must be in global
* space, and the type spec begins a function declaration; save the datatype
* code for d_newproc().
*/
typespec (typecode)
int typecode;
{
if (context & DECL)
d_declaration (typecode);
else if (context & (BODY|DEFSTMT))
mapident();
else
dtype = typecode;
}
|
