/usr.bin/awk/awkgram.y
Happy | 487 lines | 428 code | 59 blank | 0 comment | 0 complexity | 1720866c0d55c06d5b3e91499458c084 MD5 | raw file
Possible License(s): AGPL-1.0
- /****************************************************************
- Copyright (C) Lucent Technologies 1997
- All Rights Reserved
- Permission to use, copy, modify, and distribute this software and
- its documentation for any purpose and without fee is hereby
- granted, provided that the above copyright notice appear in all
- copies and that both that the copyright notice and this
- permission notice and warranty disclaimer appear in supporting
- documentation, and that the name Lucent Technologies or any of
- its entities not be used in advertising or publicity pertaining
- to distribution of the software without specific, written prior
- permission.
- LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
- INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
- IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
- SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
- IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
- ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
- THIS SOFTWARE.
- ****************************************************************/
- /* $Id: awkgram.y 563 1998-04-07 16:19:01Z tribby $ */
- %{
- #include <stdio.h>
- #include <string.h>
- #include "awk.h"
- void checkdup(Node *list, Cell *item);
- int yywrap(void) { return(1); }
- Node *beginloc = 0;
- Node *endloc = 0;
- int infunc = 0; /* = 1 if in arglist or body of func */
- int inloop = 0; /* = 1 if in while, for, do */
- char *curfname = 0; /* current function name */
- Node *arglist = 0; /* list of args for current function */
- %}
- %union {
- Node *p;
- Cell *cp;
- int i;
- char *s;
- }
- %token <i> FIRSTTOKEN /* must be first */
- %token <p> PROGRAM PASTAT PASTAT2 XBEGIN XEND
- %token <i> NL ',' '{' '(' '|' ';' '/' ')' '}' '[' ']'
- %token <i> ARRAY
- %token <i> MATCH NOTMATCH MATCHOP
- %token <i> FINAL DOT ALL CCL NCCL CHAR OR STAR QUEST PLUS
- %token <i> AND BOR APPEND EQ GE GT LE LT NE IN
- %token <i> ARG BLTIN BREAK CLOSE CONTINUE DELETE DO EXIT FOR FUNC
- %token <i> SUB GSUB IF INDEX LSUBSTR MATCHFCN NEXT NEXTFILE
- %token <i> ADD MINUS MULT DIVIDE MOD
- %token <i> ASSIGN ASGNOP ADDEQ SUBEQ MULTEQ DIVEQ MODEQ POWEQ
- %token <i> PRINT PRINTF SPRINTF
- %token <p> ELSE INTEST CONDEXPR
- %token <i> POSTINCR PREINCR POSTDECR PREDECR
- %token <cp> VAR IVAR VARNF CALL NUMBER STRING
- %token <s> REGEXPR
- %type <p> pas pattern ppattern plist pplist patlist prarg term re
- %type <p> pa_pat pa_stat pa_stats
- %type <s> reg_expr
- %type <p> simple_stmt opt_simple_stmt stmt stmtlist
- %type <p> var varname funcname varlist
- %type <p> for if else while
- %type <i> do st
- %type <i> pst opt_pst lbrace rbrace rparen comma nl opt_nl and bor
- %type <i> subop print
- %right ASGNOP
- %right '?'
- %right ':'
- %left BOR
- %left AND
- %left GETLINE
- %nonassoc APPEND EQ GE GT LE LT NE MATCHOP IN '|'
- %left ARG BLTIN BREAK CALL CLOSE CONTINUE DELETE DO EXIT FOR FUNC
- %left GSUB IF INDEX LSUBSTR MATCHFCN NEXT NUMBER
- %left PRINT PRINTF RETURN SPLIT SPRINTF STRING SUB SUBSTR
- %left REGEXPR VAR VARNF IVAR WHILE '('
- %left CAT
- %left '+' '-'
- %left '*' '/' '%'
- %left NOT UMINUS
- %right POWER
- %right DECR INCR
- %left INDIRECT
- %token LASTTOKEN /* must be last */
- %%
- program:
- pas { if (errorflag==0)
- winner = (Node *)stat3(PROGRAM, beginloc, $1, endloc); }
- | error { yyclearin; bracecheck(); ERROR "bailing out" SYNTAX; }
- ;
- and:
- AND | and NL
- ;
- bor:
- BOR | bor NL
- ;
- comma:
- ',' | comma NL
- ;
- do:
- DO | do NL
- ;
- else:
- ELSE | else NL
- ;
- for:
- FOR '(' opt_simple_stmt ';' opt_nl pattern ';' opt_nl opt_simple_stmt rparen {inloop++;} stmt
- { --inloop; $$ = stat4(FOR, $3, notnull($6), $9, $12); }
- | FOR '(' opt_simple_stmt ';' ';' opt_nl opt_simple_stmt rparen {inloop++;} stmt
- { --inloop; $$ = stat4(FOR, $3, NIL, $7, $10); }
- | FOR '(' varname IN varname rparen {inloop++;} stmt
- { --inloop; $$ = stat3(IN, $3, makearr($5), $8); }
- ;
- funcname:
- VAR { setfname($1); }
- | CALL { setfname($1); }
- ;
- if:
- IF '(' pattern rparen { $$ = notnull($3); }
- ;
- lbrace:
- '{' | lbrace NL
- ;
- nl:
- NL | nl NL
- ;
- opt_nl:
- /* empty */ { $$ = 0; }
- | nl
- ;
- opt_pst:
- /* empty */ { $$ = 0; }
- | pst
- ;
- opt_simple_stmt:
- /* empty */ { $$ = 0; }
- | simple_stmt
- ;
- pas:
- opt_pst { $$ = 0; }
- | opt_pst pa_stats opt_pst { $$ = $2; }
- ;
- pa_pat:
- pattern { $$ = notnull($1); }
- ;
- pa_stat:
- pa_pat { $$ = stat2(PASTAT, $1, stat2(PRINT, rectonode(), NIL)); }
- | pa_pat lbrace stmtlist '}' { $$ = stat2(PASTAT, $1, $3); }
- | pa_pat ',' pa_pat { $$ = pa2stat($1, $3, stat2(PRINT, rectonode(), NIL)); }
- | pa_pat ',' pa_pat lbrace stmtlist '}' { $$ = pa2stat($1, $3, $5); }
- | lbrace stmtlist '}' { $$ = stat2(PASTAT, NIL, $2); }
- | XBEGIN lbrace stmtlist '}'
- { beginloc = linkum(beginloc, $3); $$ = 0; }
- | XEND lbrace stmtlist '}'
- { endloc = linkum(endloc, $3); $$ = 0; }
- | FUNC funcname '(' varlist rparen {infunc++;} lbrace stmtlist '}'
- { infunc--; curfname=0; defn((Cell *)$2, $4, $8); $$ = 0; }
- ;
- pa_stats:
- pa_stat
- | pa_stats opt_pst pa_stat { $$ = linkum($1, $3); }
- ;
- patlist:
- pattern
- | patlist comma pattern { $$ = linkum($1, $3); }
- ;
- ppattern:
- var ASGNOP ppattern { $$ = op2($2, $1, $3); }
- | ppattern '?' ppattern ':' ppattern %prec '?'
- { $$ = op3(CONDEXPR, notnull($1), $3, $5); }
- | ppattern bor ppattern %prec BOR
- { $$ = op2(BOR, notnull($1), notnull($3)); }
- | ppattern and ppattern %prec AND
- { $$ = op2(AND, notnull($1), notnull($3)); }
- | ppattern MATCHOP reg_expr { $$ = op3($2, NIL, $1, (Node*)makedfa($3, 0)); }
- | ppattern MATCHOP ppattern
- { if (constnode($3))
- $$ = op3($2, NIL, $1, (Node*)makedfa(strnode($3), 0));
- else
- $$ = op3($2, (Node *)1, $1, $3); }
- | ppattern IN varname { $$ = op2(INTEST, $1, makearr($3)); }
- | '(' plist ')' IN varname { $$ = op2(INTEST, $2, makearr($5)); }
- | ppattern term %prec CAT { $$ = op2(CAT, $1, $2); }
- | re
- | term
- ;
- pattern:
- var ASGNOP pattern { $$ = op2($2, $1, $3); }
- | pattern '?' pattern ':' pattern %prec '?'
- { $$ = op3(CONDEXPR, notnull($1), $3, $5); }
- | pattern bor pattern %prec BOR
- { $$ = op2(BOR, notnull($1), notnull($3)); }
- | pattern and pattern %prec AND
- { $$ = op2(AND, notnull($1), notnull($3)); }
- | pattern EQ pattern { $$ = op2($2, $1, $3); }
- | pattern GE pattern { $$ = op2($2, $1, $3); }
- | pattern GT pattern { $$ = op2($2, $1, $3); }
- | pattern LE pattern { $$ = op2($2, $1, $3); }
- | pattern LT pattern { $$ = op2($2, $1, $3); }
- | pattern NE pattern { $$ = op2($2, $1, $3); }
- | pattern MATCHOP reg_expr { $$ = op3($2, NIL, $1, (Node*)makedfa($3, 0)); }
- | pattern MATCHOP pattern
- { if (constnode($3))
- $$ = op3($2, NIL, $1, (Node*)makedfa(strnode($3), 0));
- else
- $$ = op3($2, (Node *)1, $1, $3); }
- | pattern IN varname { $$ = op2(INTEST, $1, makearr($3)); }
- | '(' plist ')' IN varname { $$ = op2(INTEST, $2, makearr($5)); }
- | pattern '|' GETLINE var {
- if (safe) ERROR "cmd | getline is unsafe" SYNTAX;
- else $$ = op3(GETLINE, $4, (Node*)$2, $1); }
- | pattern '|' GETLINE {
- if (safe) ERROR "cmd | getline is unsafe" SYNTAX;
- else $$ = op3(GETLINE, (Node*)0, (Node*)$2, $1); }
- | pattern term %prec CAT { $$ = op2(CAT, $1, $2); }
- | re
- | term
- ;
- plist:
- pattern comma pattern { $$ = linkum($1, $3); }
- | plist comma pattern { $$ = linkum($1, $3); }
- ;
- pplist:
- ppattern
- | pplist comma ppattern { $$ = linkum($1, $3); }
- ;
- prarg:
- /* empty */ { $$ = rectonode(); }
- | pplist
- | '(' plist ')' { $$ = $2; }
- ;
- print:
- PRINT | PRINTF
- ;
- pst:
- NL | ';' | pst NL | pst ';'
- ;
- rbrace:
- '}' | rbrace NL
- ;
- re:
- reg_expr
- { $$ = op3(MATCH, NIL, rectonode(), (Node*)makedfa($1, 0)); }
- | NOT re { $$ = op1(NOT, notnull($2)); }
- ;
- reg_expr:
- '/' {startreg();} REGEXPR '/' { $$ = $3; }
- ;
- rparen:
- ')' | rparen NL
- ;
- simple_stmt:
- print prarg '|' term {
- if (safe) ERROR "print | is unsafe" SYNTAX;
- else $$ = stat3($1, $2, (Node *) $3, $4); }
- | print prarg APPEND term {
- if (safe) ERROR "print >> is unsafe" SYNTAX;
- else $$ = stat3($1, $2, (Node *) $3, $4); }
- | print prarg GT term {
- if (safe) ERROR "print > is unsafe" SYNTAX;
- else $$ = stat3($1, $2, (Node *) $3, $4); }
- | print prarg { $$ = stat3($1, $2, NIL, NIL); }
- | DELETE varname '[' patlist ']' { $$ = stat2(DELETE, makearr($2), $4); }
- | DELETE varname { $$ = stat2(DELETE, makearr($2), 0); }
- | pattern { $$ = exptostat($1); }
- | error { yyclearin; ERROR "illegal statement" SYNTAX; }
- ;
- st:
- nl
- | ';' opt_nl
- ;
- stmt:
- BREAK st { if (!inloop) ERROR "break illegal outside of loops" SYNTAX;
- $$ = stat1(BREAK, NIL); }
- | CLOSE pattern st { $$ = stat1(CLOSE, $2); }
- | CONTINUE st { if (!inloop) ERROR "continue illegal outside of loops" SYNTAX;
- $$ = stat1(CONTINUE, NIL); }
- | do {inloop++;} stmt {--inloop;} WHILE '(' pattern ')' st
- { $$ = stat2(DO, $3, notnull($7)); }
- | EXIT pattern st { $$ = stat1(EXIT, $2); }
- | EXIT st { $$ = stat1(EXIT, NIL); }
- | for
- | if stmt else stmt { $$ = stat3(IF, $1, $2, $4); }
- | if stmt { $$ = stat3(IF, $1, $2, NIL); }
- | lbrace stmtlist rbrace { $$ = $2; }
- | NEXT st { if (infunc)
- ERROR "next is illegal inside a function" SYNTAX;
- $$ = stat1(NEXT, NIL); }
- | NEXTFILE st { if (infunc)
- ERROR "nextfile is illegal inside a function" SYNTAX;
- $$ = stat1(NEXTFILE, NIL); }
- | RETURN pattern st { $$ = stat1(RETURN, $2); }
- | RETURN st { $$ = stat1(RETURN, NIL); }
- | simple_stmt st
- | while {inloop++;} stmt { --inloop; $$ = stat2(WHILE, $1, $3); }
- | ';' opt_nl { $$ = 0; }
- ;
- stmtlist:
- stmt
- | stmtlist stmt { $$ = linkum($1, $2); }
- ;
- subop:
- SUB | GSUB
- ;
- term:
- term '+' term { $$ = op2(ADD, $1, $3); }
- | term '-' term { $$ = op2(MINUS, $1, $3); }
- | term '*' term { $$ = op2(MULT, $1, $3); }
- | term '/' term { $$ = op2(DIVIDE, $1, $3); }
- | term '%' term { $$ = op2(MOD, $1, $3); }
- | term POWER term { $$ = op2(POWER, $1, $3); }
- | '-' term %prec UMINUS { $$ = op1(UMINUS, $2); }
- | '+' term %prec UMINUS { $$ = $2; }
- | NOT term %prec UMINUS { $$ = op1(NOT, notnull($2)); }
- | BLTIN '(' ')' { $$ = op2(BLTIN, (Node *) $1, rectonode()); }
- | BLTIN '(' patlist ')' { $$ = op2(BLTIN, (Node *) $1, $3); }
- | BLTIN { $$ = op2(BLTIN, (Node *) $1, rectonode()); }
- | CALL '(' ')' { $$ = op2(CALL, celltonode($1,CVAR), NIL); }
- | CALL '(' patlist ')' { $$ = op2(CALL, celltonode($1,CVAR), $3); }
- | DECR var { $$ = op1(PREDECR, $2); }
- | INCR var { $$ = op1(PREINCR, $2); }
- | var DECR { $$ = op1(POSTDECR, $1); }
- | var INCR { $$ = op1(POSTINCR, $1); }
- | GETLINE var LT term { $$ = op3(GETLINE, $2, (Node *)$3, $4); }
- | GETLINE LT term { $$ = op3(GETLINE, NIL, (Node *)$2, $3); }
- | GETLINE var { $$ = op3(GETLINE, $2, NIL, NIL); }
- | GETLINE { $$ = op3(GETLINE, NIL, NIL, NIL); }
- | INDEX '(' pattern comma pattern ')'
- { $$ = op2(INDEX, $3, $5); }
- | INDEX '(' pattern comma reg_expr ')'
- { ERROR "index() doesn't permit regular expressions" SYNTAX;
- $$ = op2(INDEX, $3, (Node*)$5); }
- | '(' pattern ')' { $$ = $2; }
- | MATCHFCN '(' pattern comma reg_expr ')'
- { $$ = op3(MATCHFCN, NIL, $3, (Node*)makedfa($5, 1)); }
- | MATCHFCN '(' pattern comma pattern ')'
- { if (constnode($5))
- $$ = op3(MATCHFCN, NIL, $3, (Node*)makedfa(strnode($5), 1));
- else
- $$ = op3(MATCHFCN, (Node *)1, $3, $5); }
- | NUMBER { $$ = celltonode($1, CCON); }
- | SPLIT '(' pattern comma varname comma pattern ')' /* string */
- { $$ = op4(SPLIT, $3, makearr($5), $7, (Node*)STRING); }
- | SPLIT '(' pattern comma varname comma reg_expr ')' /* const /regexp/ */
- { $$ = op4(SPLIT, $3, makearr($5), (Node*)makedfa($7, 1), (Node *)REGEXPR); }
- | SPLIT '(' pattern comma varname ')'
- { $$ = op4(SPLIT, $3, makearr($5), NIL, (Node*)STRING); } /* default */
- | SPRINTF '(' patlist ')' { $$ = op1($1, $3); }
- | STRING { $$ = celltonode($1, CCON); }
- | subop '(' reg_expr comma pattern ')'
- { $$ = op4($1, NIL, (Node*)makedfa($3, 1), $5, rectonode()); }
- | subop '(' pattern comma pattern ')'
- { if (constnode($3))
- $$ = op4($1, NIL, (Node*)makedfa(strnode($3), 1), $5, rectonode());
- else
- $$ = op4($1, (Node *)1, $3, $5, rectonode()); }
- | subop '(' reg_expr comma pattern comma var ')'
- { $$ = op4($1, NIL, (Node*)makedfa($3, 1), $5, $7); }
- | subop '(' pattern comma pattern comma var ')'
- { if (constnode($3))
- $$ = op4($1, NIL, (Node*)makedfa(strnode($3), 1), $5, $7);
- else
- $$ = op4($1, (Node *)1, $3, $5, $7); }
- | SUBSTR '(' pattern comma pattern comma pattern ')'
- { $$ = op3(SUBSTR, $3, $5, $7); }
- | SUBSTR '(' pattern comma pattern ')'
- { $$ = op3(SUBSTR, $3, $5, NIL); }
- | var
- ;
- var:
- varname
- | varname '[' patlist ']' { $$ = op2(ARRAY, makearr($1), $3); }
- | IVAR { $$ = op1(INDIRECT, celltonode($1, CVAR)); }
- | INDIRECT term { $$ = op1(INDIRECT, $2); }
- ;
- varlist:
- /* nothing */ { arglist = $$ = 0; }
- | VAR { arglist = $$ = celltonode($1,CVAR); }
- | varlist comma VAR {
- checkdup($1, $3);
- arglist = $$ = linkum($1,celltonode($3,CVAR)); }
- ;
- varname:
- VAR { $$ = celltonode($1, CVAR); }
- | ARG { $$ = op1(ARG, (Node *) $1); }
- | VARNF { $$ = op1(VARNF, (Node *) $1); }
- ;
- while:
- WHILE '(' pattern rparen { $$ = notnull($3); }
- ;
- %%
- void setfname(Cell *p)
- {
- if (isarr(p))
- ERROR "%s is an array, not a function", p->nval SYNTAX;
- else if (isfcn(p))
- ERROR "you can't define function %s more than once", p->nval SYNTAX;
- 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) {
- ERROR "duplicate argument %s", s SYNTAX;
- break;
- }
- }
- }