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|
comment "#"
D [0-9]
H [0-9a-fA-F]
A [a-zA-Z]
%%
[ \t]+ /* groups of blanks and tabs, while significant as delimiters,
* are otherwise ignored.
*/ ;
","[ \t]*\n { /* trailing ',' implies continuation */
return (',');
}
"\\"[ \t]*\n { /* trailing '\' completely absorbed */
}
^[ \t]*"!".* {
/* Host os command escape. Remove everything up through
* '!'. Let clsystem decide what to do with null cmd.
* Must precede the "!" YOP_NOT spec in this file.
*/
register char *cp;
for (cp = yytext; *cp++ != '!'; )
;
yylval = addconst (cp, OT_STRING);
return (Y_OSESC);
}
"|&" return (Y_ALLPIPE); /* pipe all, even stderr */
">>" return (Y_APPEND); /* append all but stderr */
">>&" return (Y_ALLAPPEND); /* append all, even stderr */
">&" return (Y_ALLREDIR); /* redirect all, even stderr */
(">"|">>")("G"|"I"|"P")+ {
yylval = addconst (yytext, OT_STRING);
return (Y_GSREDIR);
}
"<=" return (YOP_LE); /* operators... */
">=" return (YOP_GE);
"==" return (YOP_EQ);
"!=" return (YOP_NE);
"**" return (YOP_POW);
"||" return (YOP_OR);
"&&" return (YOP_AND);
"!" return (YOP_NOT);
"+=" return (YOP_AOADD);
"-=" return (YOP_AOSUB);
"*=" return (YOP_AOMUL);
"/=" return (YOP_AODIV);
"//=" return (YOP_AOCAT);
"//" return (YOP_CONCAT);
"}" { if (dobrace) {
dobrace = NO;
return (*yytext);
} else {
dobrace = YES;
unput (*yytext);
return (';');
}
}
"^" return (*yytext); /* debug: print stack */
"/" return (*yytext); /* debug: single step */
"?" return (crackident (yytext)); /* current package help */
"??" return (crackident (yytext)); /* all tasks help */
"&" { extern bracelevel;
if (bracelevel) {
eprintf ("ERROR: background not allowed within statement block\n");
return ('#');
} else {
yyleng = 0;
while ((yytext[yyleng]=input()) != '\n')
yyleng++;
yytext[yyleng] = '\0';
bkg_init (yytext);
return (Y_NEWLINE);
}
}
({A}|"$"|"_")({A}|"$"|{D}|"_"|".")* {
/* crackident() sets yylval and returns token value.
*/
return (crackident (yytext));
}
{D}+(([bB])|({H}*[xX]))? {
/* must precede OT_REAL as integers also match there */
yylval = addconst (yytext, OT_INT);
return (Y_CONSTANT);
}
(({D}+)|(({D}*"."{D}+)|({D}+"."{D}*)))([eEdD][+-]?{D}+)? {
yylval = addconst (yytext, OT_REAL);
return (Y_CONSTANT);
}
{D}+":"{D}+(":"{D}*("."{D}*)?)? {
/* sexagesimal format */
yylval = addconst (yytext, OT_REAL);
return (Y_CONSTANT);
}
(\")|(\') { /* Quoted string. call traverse() to read the
* string into yytext.
*/
traverse (*yytext);
yylval = addconst (yytext, OT_STRING);
return (Y_CONSTANT);
}
\n return (Y_NEWLINE);
{comment} { /* Ignore a comment. */
while (input() != '\n')
;
unput ('\n');
}
. return (*yytext);
%%
#include "errs.h"
/* See gram.c for the various support functions, such as addconst()
* and crackident(). Traverse is included here since it directly
* references input, unput, yytext, etc.
*/
/* TRAVERSE -- Called by the lexical analyzer when a quoted string has
* been recognized. Characters are input and deposited in yytext (the
* lexical analyzer token buffer) until the trailing quote is seen.
* Strings may not span lines unless the newline is delimited. The
* recognized escape sequences are converted upon input; all others are
* left alone, presumably to later be converted by other code.
* Quotes may be included in the string by escaping them, or by means of
* the double quote convention.
*/
traverse (delim)
char delim;
{
register char *op, *cp, ch;
static char *esc_ch = "ntfr\\\"'";
static char *esc_val = "\n\t\f\r\\\"\'";
char *index();
for (op=yytext; (*op = input()) != EOF; op++) {
if (*op == delim) {
if ((*op = input()) == EOF)
break;
if (*op == delim)
continue; /* double quote convention; keep one */
else {
unput (*op);
break; /* normal exit */
}
} else if (*op == '\n') { /* error recovery exit */
*op = '\0';
cl_error (E_UERR, "Newline while processing string");
break;
} else if (*op == '\\') {
if ((*op = input()) == EOF) {
break;
} else if (*op == '\n') {
--op; /* explicit continuation */
while ((ch = input()) && isspace(ch) || ch == '#') {
if (ch == '#')
while ((ch = input()) && ch != '\n')
;
}
unput (ch);
continue;
} else if ((cp = index (esc_ch, *op)) != NULL) {
*op = esc_val[cp-esc_ch];
} else if (isdigit (*op)) { /* '\0DD' octal constant */
*op -= '0';
while (isdigit (ch = input()))
*op = (*op * 8) + (ch - '0');
unput (ch);
} else {
ch = *op; /* unknown escape sequence, */
*op++ = '\\'; /* leave it alone. */
*op = ch;
}
}
}
*op = '\0';
yyleng = (op - yytext);
}
|
