487 lines
14 KiB
Plaintext
487 lines
14 KiB
Plaintext
/****************************************************************
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Copyright (C) Lucent Technologies 1997
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and
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its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name Lucent Technologies or any of
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its entities not be used in advertising or publicity pertaining
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to distribution of the software without specific, written prior
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permission.
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LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
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IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
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SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
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THIS SOFTWARE.
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****************************************************************/
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%{
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#include <stdio.h>
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#include <string.h>
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#include "awk.h"
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void checkdup(Node *list, Cell *item);
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int yywrap(void) { return(1); }
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Node *beginloc = 0;
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Node *endloc = 0;
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int infunc = 0; /* = 1 if in arglist or body of func */
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int inloop = 0; /* = 1 if in while, for, do */
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char *curfname = 0; /* current function name */
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Node *arglist = 0; /* list of args for current function */
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%}
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%union {
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Node *p;
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Cell *cp;
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int i;
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char *s;
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}
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%token <i> FIRSTTOKEN /* must be first */
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%token <p> PROGRAM PASTAT PASTAT2 XBEGIN XEND
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%token <i> NL ',' '{' '(' '|' ';' '/' ')' '}' '[' ']'
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%token <i> ARRAY
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%token <i> MATCH NOTMATCH MATCHOP
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%token <i> FINAL DOT ALL CCL NCCL CHAR OR STAR QUEST PLUS EMPTYRE
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%token <i> AND BOR APPEND EQ GE GT LE LT NE IN
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%token <i> ARG BLTIN BREAK CLOSE CONTINUE DELETE DO EXIT FOR FUNC
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%token <i> SUB GSUB IF INDEX LSUBSTR MATCHFCN NEXT NEXTFILE
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%token <i> ADD MINUS MULT DIVIDE MOD
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%token <i> ASSIGN ASGNOP ADDEQ SUBEQ MULTEQ DIVEQ MODEQ POWEQ
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%token <i> PRINT PRINTF SPRINTF
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%token <p> ELSE INTEST CONDEXPR
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%token <i> POSTINCR PREINCR POSTDECR PREDECR
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%token <cp> VAR IVAR VARNF CALL NUMBER STRING
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%token <s> REGEXPR
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%type <p> pas pattern ppattern plist pplist patlist prarg term re
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%type <p> pa_pat pa_stat pa_stats
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%type <s> reg_expr
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%type <p> simple_stmt opt_simple_stmt stmt stmtlist
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%type <p> var varname funcname varlist
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%type <p> for if else while
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%type <i> do st
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%type <i> pst opt_pst lbrace rbrace rparen comma nl opt_nl and bor
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%type <i> subop print
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%right ASGNOP
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%right '?'
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%right ':'
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%left BOR
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%left AND
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%left GETLINE
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%nonassoc APPEND EQ GE GT LE LT NE MATCHOP IN '|'
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%left ARG BLTIN BREAK CALL CLOSE CONTINUE DELETE DO EXIT FOR FUNC
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%left GSUB IF INDEX LSUBSTR MATCHFCN NEXT NUMBER
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%left PRINT PRINTF RETURN SPLIT SPRINTF STRING SUB SUBSTR
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%left REGEXPR VAR VARNF IVAR WHILE '('
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%left CAT
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%left '+' '-'
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%left '*' '/' '%'
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%left NOT UMINUS
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%right POWER
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%right DECR INCR
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%left INDIRECT
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%token LASTTOKEN /* must be last */
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%%
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program:
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pas { if (errorflag==0)
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winner = (Node *)stat3(PROGRAM, beginloc, $1, endloc); }
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| error { yyclearin; bracecheck(); SYNTAX("bailing out"); }
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;
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and:
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AND | and NL
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;
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bor:
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BOR | bor NL
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;
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comma:
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',' | comma NL
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;
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do:
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DO | do NL
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;
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else:
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ELSE | else NL
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;
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for:
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FOR '(' opt_simple_stmt ';' opt_nl pattern ';' opt_nl opt_simple_stmt rparen {inloop++;} stmt
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{ --inloop; $$ = stat4(FOR, $3, notnull($6), $9, $12); }
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| FOR '(' opt_simple_stmt ';' ';' opt_nl opt_simple_stmt rparen {inloop++;} stmt
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{ --inloop; $$ = stat4(FOR, $3, NIL, $7, $10); }
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| FOR '(' varname IN varname rparen {inloop++;} stmt
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{ --inloop; $$ = stat3(IN, $3, makearr($5), $8); }
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;
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funcname:
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VAR { setfname($1); }
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| CALL { setfname($1); }
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;
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if:
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IF '(' pattern rparen { $$ = notnull($3); }
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;
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lbrace:
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'{' | lbrace NL
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;
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nl:
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NL | nl NL
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;
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opt_nl:
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/* empty */ { $$ = 0; }
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| nl
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;
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opt_pst:
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/* empty */ { $$ = 0; }
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| pst
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;
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opt_simple_stmt:
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/* empty */ { $$ = 0; }
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| simple_stmt
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;
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pas:
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opt_pst { $$ = 0; }
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| opt_pst pa_stats opt_pst { $$ = $2; }
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;
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pa_pat:
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pattern { $$ = notnull($1); }
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;
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pa_stat:
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pa_pat { $$ = stat2(PASTAT, $1, stat2(PRINT, rectonode(), NIL)); }
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| pa_pat lbrace stmtlist '}' { $$ = stat2(PASTAT, $1, $3); }
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| pa_pat ',' opt_nl pa_pat { $$ = pa2stat($1, $4, stat2(PRINT, rectonode(), NIL)); }
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| pa_pat ',' opt_nl pa_pat lbrace stmtlist '}' { $$ = pa2stat($1, $4, $6); }
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| lbrace stmtlist '}' { $$ = stat2(PASTAT, NIL, $2); }
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| XBEGIN lbrace stmtlist '}'
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{ beginloc = linkum(beginloc, $3); $$ = 0; }
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| XEND lbrace stmtlist '}'
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{ endloc = linkum(endloc, $3); $$ = 0; }
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| FUNC funcname '(' varlist rparen {infunc++;} lbrace stmtlist '}'
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{ infunc--; curfname=0; defn((Cell *)$2, $4, $8); $$ = 0; }
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;
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pa_stats:
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pa_stat
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| pa_stats opt_pst pa_stat { $$ = linkum($1, $3); }
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;
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patlist:
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pattern
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| patlist comma pattern { $$ = linkum($1, $3); }
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;
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ppattern:
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var ASGNOP ppattern { $$ = op2($2, $1, $3); }
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| ppattern '?' ppattern ':' ppattern %prec '?'
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{ $$ = op3(CONDEXPR, notnull($1), $3, $5); }
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| ppattern bor ppattern %prec BOR
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{ $$ = op2(BOR, notnull($1), notnull($3)); }
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| ppattern and ppattern %prec AND
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{ $$ = op2(AND, notnull($1), notnull($3)); }
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| ppattern MATCHOP reg_expr { $$ = op3($2, NIL, $1, (Node*)makedfa($3, 0)); }
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| ppattern MATCHOP ppattern
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{ if (constnode($3))
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$$ = op3($2, NIL, $1, (Node*)makedfa(strnode($3), 0));
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else
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$$ = op3($2, (Node *)1, $1, $3); }
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| ppattern IN varname { $$ = op2(INTEST, $1, makearr($3)); }
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| '(' plist ')' IN varname { $$ = op2(INTEST, $2, makearr($5)); }
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| ppattern term %prec CAT { $$ = op2(CAT, $1, $2); }
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| re
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| term
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;
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pattern:
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var ASGNOP pattern { $$ = op2($2, $1, $3); }
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| pattern '?' pattern ':' pattern %prec '?'
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{ $$ = op3(CONDEXPR, notnull($1), $3, $5); }
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| pattern bor pattern %prec BOR
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{ $$ = op2(BOR, notnull($1), notnull($3)); }
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| pattern and pattern %prec AND
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{ $$ = op2(AND, notnull($1), notnull($3)); }
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| pattern EQ pattern { $$ = op2($2, $1, $3); }
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| pattern GE pattern { $$ = op2($2, $1, $3); }
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| pattern GT pattern { $$ = op2($2, $1, $3); }
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| pattern LE pattern { $$ = op2($2, $1, $3); }
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| pattern LT pattern { $$ = op2($2, $1, $3); }
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| pattern NE pattern { $$ = op2($2, $1, $3); }
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| pattern MATCHOP reg_expr { $$ = op3($2, NIL, $1, (Node*)makedfa($3, 0)); }
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| pattern MATCHOP pattern
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{ if (constnode($3))
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$$ = op3($2, NIL, $1, (Node*)makedfa(strnode($3), 0));
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else
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$$ = op3($2, (Node *)1, $1, $3); }
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| pattern IN varname { $$ = op2(INTEST, $1, makearr($3)); }
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| '(' plist ')' IN varname { $$ = op2(INTEST, $2, makearr($5)); }
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| pattern '|' GETLINE var {
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if (safe) SYNTAX("cmd | getline is unsafe");
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else $$ = op3(GETLINE, $4, itonp($2), $1); }
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| pattern '|' GETLINE {
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if (safe) SYNTAX("cmd | getline is unsafe");
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else $$ = op3(GETLINE, (Node*)0, itonp($2), $1); }
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| pattern term %prec CAT { $$ = op2(CAT, $1, $2); }
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| re
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| term
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;
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plist:
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pattern comma pattern { $$ = linkum($1, $3); }
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| plist comma pattern { $$ = linkum($1, $3); }
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;
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pplist:
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ppattern
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| pplist comma ppattern { $$ = linkum($1, $3); }
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;
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prarg:
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/* empty */ { $$ = rectonode(); }
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| pplist
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| '(' plist ')' { $$ = $2; }
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;
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print:
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PRINT | PRINTF
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;
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pst:
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NL | ';' | pst NL | pst ';'
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;
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rbrace:
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'}' | rbrace NL
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;
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re:
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reg_expr
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{ $$ = op3(MATCH, NIL, rectonode(), (Node*)makedfa($1, 0)); }
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| NOT re { $$ = op1(NOT, notnull($2)); }
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;
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reg_expr:
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'/' {startreg();} REGEXPR '/' { $$ = $3; }
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;
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rparen:
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')' | rparen NL
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;
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simple_stmt:
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print prarg '|' term {
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if (safe) SYNTAX("print | is unsafe");
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else $$ = stat3($1, $2, itonp($3), $4); }
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| print prarg APPEND term {
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if (safe) SYNTAX("print >> is unsafe");
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else $$ = stat3($1, $2, itonp($3), $4); }
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| print prarg GT term {
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if (safe) SYNTAX("print > is unsafe");
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else $$ = stat3($1, $2, itonp($3), $4); }
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| print prarg { $$ = stat3($1, $2, NIL, NIL); }
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| DELETE varname '[' patlist ']' { $$ = stat2(DELETE, makearr($2), $4); }
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| DELETE varname { $$ = stat2(DELETE, makearr($2), 0); }
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| pattern { $$ = exptostat($1); }
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| error { yyclearin; SYNTAX("illegal statement"); }
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;
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st:
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nl
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| ';' opt_nl
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;
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stmt:
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BREAK st { if (!inloop) SYNTAX("break illegal outside of loops");
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$$ = stat1(BREAK, NIL); }
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| CONTINUE st { if (!inloop) SYNTAX("continue illegal outside of loops");
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$$ = stat1(CONTINUE, NIL); }
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| do {inloop++;} stmt {--inloop;} WHILE '(' pattern ')' st
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{ $$ = stat2(DO, $3, notnull($7)); }
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| EXIT pattern st { $$ = stat1(EXIT, $2); }
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| EXIT st { $$ = stat1(EXIT, NIL); }
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| for
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| if stmt else stmt { $$ = stat3(IF, $1, $2, $4); }
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| if stmt { $$ = stat3(IF, $1, $2, NIL); }
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| lbrace stmtlist rbrace { $$ = $2; }
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| NEXT st { if (infunc)
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SYNTAX("next is illegal inside a function");
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$$ = stat1(NEXT, NIL); }
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| NEXTFILE st { if (infunc)
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SYNTAX("nextfile is illegal inside a function");
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$$ = stat1(NEXTFILE, NIL); }
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| RETURN pattern st { $$ = stat1(RETURN, $2); }
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| RETURN st { $$ = stat1(RETURN, NIL); }
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| simple_stmt st
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| while {inloop++;} stmt { --inloop; $$ = stat2(WHILE, $1, $3); }
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| ';' opt_nl { $$ = 0; }
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;
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stmtlist:
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stmt
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| stmtlist stmt { $$ = linkum($1, $2); }
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;
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subop:
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SUB | GSUB
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;
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term:
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term '/' ASGNOP term { $$ = op2(DIVEQ, $1, $4); }
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| term '+' term { $$ = op2(ADD, $1, $3); }
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| term '-' term { $$ = op2(MINUS, $1, $3); }
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| term '*' term { $$ = op2(MULT, $1, $3); }
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| term '/' term { $$ = op2(DIVIDE, $1, $3); }
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| term '%' term { $$ = op2(MOD, $1, $3); }
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| term POWER term { $$ = op2(POWER, $1, $3); }
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| '-' term %prec UMINUS { $$ = op1(UMINUS, $2); }
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| '+' term %prec UMINUS { $$ = $2; }
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| NOT term %prec UMINUS { $$ = op1(NOT, notnull($2)); }
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| BLTIN '(' ')' { $$ = op2(BLTIN, itonp($1), rectonode()); }
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| BLTIN '(' patlist ')' { $$ = op2(BLTIN, itonp($1), $3); }
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| BLTIN { $$ = op2(BLTIN, itonp($1), rectonode()); }
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| CALL '(' ')' { $$ = op2(CALL, celltonode($1,CVAR), NIL); }
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| CALL '(' patlist ')' { $$ = op2(CALL, celltonode($1,CVAR), $3); }
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| CLOSE term { $$ = op1(CLOSE, $2); }
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| DECR var { $$ = op1(PREDECR, $2); }
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| INCR var { $$ = op1(PREINCR, $2); }
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| var DECR { $$ = op1(POSTDECR, $1); }
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| var INCR { $$ = op1(POSTINCR, $1); }
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| GETLINE var LT term { $$ = op3(GETLINE, $2, itonp($3), $4); }
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| GETLINE LT term { $$ = op3(GETLINE, NIL, itonp($2), $3); }
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| GETLINE var { $$ = op3(GETLINE, $2, NIL, NIL); }
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| GETLINE { $$ = op3(GETLINE, NIL, NIL, NIL); }
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| INDEX '(' pattern comma pattern ')'
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{ $$ = op2(INDEX, $3, $5); }
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| INDEX '(' pattern comma reg_expr ')'
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{ SYNTAX("index() doesn't permit regular expressions");
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$$ = op2(INDEX, $3, (Node*)$5); }
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| '(' pattern ')' { $$ = $2; }
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| MATCHFCN '(' pattern comma reg_expr ')'
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{ $$ = op3(MATCHFCN, NIL, $3, (Node*)makedfa($5, 1)); }
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| MATCHFCN '(' pattern comma pattern ')'
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{ if (constnode($5))
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$$ = op3(MATCHFCN, NIL, $3, (Node*)makedfa(strnode($5), 1));
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else
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$$ = op3(MATCHFCN, (Node *)1, $3, $5); }
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| NUMBER { $$ = celltonode($1, CCON); }
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| SPLIT '(' pattern comma varname comma pattern ')' /* string */
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{ $$ = op4(SPLIT, $3, makearr($5), $7, (Node*)STRING); }
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| SPLIT '(' pattern comma varname comma reg_expr ')' /* const /regexp/ */
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{ $$ = op4(SPLIT, $3, makearr($5), (Node*)makedfa($7, 1), (Node *)REGEXPR); }
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| SPLIT '(' pattern comma varname ')'
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{ $$ = op4(SPLIT, $3, makearr($5), NIL, (Node*)STRING); } /* default */
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| SPRINTF '(' patlist ')' { $$ = op1($1, $3); }
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| STRING { $$ = celltonode($1, CCON); }
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| subop '(' reg_expr comma pattern ')'
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{ $$ = op4($1, NIL, (Node*)makedfa($3, 1), $5, rectonode()); }
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| subop '(' pattern comma pattern ')'
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{ if (constnode($3))
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$$ = op4($1, NIL, (Node*)makedfa(strnode($3), 1), $5, rectonode());
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else
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$$ = op4($1, (Node *)1, $3, $5, rectonode()); }
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| subop '(' reg_expr comma pattern comma var ')'
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{ $$ = op4($1, NIL, (Node*)makedfa($3, 1), $5, $7); }
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| subop '(' pattern comma pattern comma var ')'
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{ if (constnode($3))
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$$ = op4($1, NIL, (Node*)makedfa(strnode($3), 1), $5, $7);
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else
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$$ = op4($1, (Node *)1, $3, $5, $7); }
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| SUBSTR '(' pattern comma pattern comma pattern ')'
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{ $$ = op3(SUBSTR, $3, $5, $7); }
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| SUBSTR '(' pattern comma pattern ')'
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{ $$ = op3(SUBSTR, $3, $5, NIL); }
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| var
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;
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|
var:
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varname
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| varname '[' patlist ']' { $$ = op2(ARRAY, makearr($1), $3); }
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| IVAR { $$ = op1(INDIRECT, celltonode($1, CVAR)); }
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| INDIRECT term { $$ = op1(INDIRECT, $2); }
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;
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varlist:
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/* nothing */ { arglist = $$ = 0; }
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| VAR { arglist = $$ = celltonode($1,CVAR); }
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| varlist comma VAR {
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checkdup($1, $3);
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arglist = $$ = linkum($1,celltonode($3,CVAR)); }
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;
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varname:
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VAR { $$ = celltonode($1, CVAR); }
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| ARG { $$ = op1(ARG, itonp($1)); }
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| VARNF { $$ = op1(VARNF, (Node *) $1); }
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;
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|
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while:
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WHILE '(' pattern rparen { $$ = notnull($3); }
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;
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|
%%
|
|
|
|
void setfname(Cell *p)
|
|
{
|
|
if (isarr(p))
|
|
SYNTAX("%s is an array, not a function", p->nval);
|
|
else if (isfcn(p))
|
|
SYNTAX("you can't define function %s more than once", p->nval);
|
|
curfname = p->nval;
|
|
}
|
|
|
|
int constnode(Node *p)
|
|
{
|
|
return isvalue(p) && ((Cell *) (p->narg[0]))->csub == CCON;
|
|
}
|
|
|
|
char *strnode(Node *p)
|
|
{
|
|
return ((Cell *)(p->narg[0]))->sval;
|
|
}
|
|
|
|
Node *notnull(Node *n)
|
|
{
|
|
switch (n->nobj) {
|
|
case LE: case LT: case EQ: case NE: case GT: case GE:
|
|
case BOR: case AND: case NOT:
|
|
return n;
|
|
default:
|
|
return op2(NE, n, nullnode);
|
|
}
|
|
}
|
|
|
|
void checkdup(Node *vl, Cell *cp) /* check if name already in list */
|
|
{
|
|
char *s = cp->nval;
|
|
for ( ; vl; vl = vl->nnext) {
|
|
if (strcmp(s, ((Cell *)(vl->narg[0]))->nval) == 0) {
|
|
SYNTAX("duplicate argument %s", s);
|
|
break;
|
|
}
|
|
}
|
|
}
|