| 1 | block data |
| 2 | integer cshift, csize, yynlin |
| 3 | common /yyllib/ cshift, csize, yynlin |
| 4 | data yynlin/YYNEWLINE/ |
| 5 | end |
| 6 | block data |
| 7 | common /yyldat/ yyfnd, ymorf, yyprev, yybgin, yytop |
| 8 | integer yyfnd, yymorf, yyprev, yybgin, yytop |
| 9 | data yybgin/1/ |
| 10 | data yyprev/YYNEWLINE/ |
| 11 | data yytop/YYTOPVAL/ |
| 12 | end |
| 13 | integer function yylook(dummy) |
| 14 | common /Lverif/ verif |
| 15 | common /Ladvan/ advan |
| 16 | common /Lstoff/ stoff |
| 17 | common /Lsfall/ sfall |
| 18 | common /Latable/ atable |
| 19 | common /Lextra/ extra |
| 20 | common /Lvstop/ vstop |
| 21 | integer verif(Sverif), advan(Sadvan),stoff(Sstoff),match(Smatch) |
| 22 | integer sfall(Ssfall),atable(Satable),extra(Sextra), vstop(Svstop) |
| 23 | integer state, lsp, r |
| 24 | integer ch, n |
| 25 | common /yyldat/ yyfnd, yymorf, yyprev, yybgin, yytop, yylsp, yylsta(YYLMAX) |
| 26 | common /yyxel/ yyleng, yytext |
| 27 | integer yyfnd, yymorf, yylsta, yylsp, yytext, yyprev, yyleng, yytop |
| 28 | integer lexshf, yytext(YYLMAX), yyback, yybgin |
| 29 | integer z, t |
| 30 | if (yymorf .eq. 0) |
| 31 | yyleng = 0 |
| 32 | else |
| 33 | yymorf=0 |
| 34 | 1776 |
| 35 | lsp = 1 |
| 36 | state = yybgin |
| 37 | if (yyprev .eq. YYNEWLINE) |
| 38 | state = state + 1 |
| 39 | for (;;){ |
| 40 | r = stoff(state) |
| 41 | if (r .eq. 0){ |
| 42 | z = sfall(state) |
| 43 | if (z .eq. 0) |
| 44 | break |
| 45 | if(stoff(z) == 0) break |
| 46 | } |
| 47 | ch = input(dummy) |
| 48 | ich = lexshf(ch) |
| 49 | yyleng = yyleng+1 |
| 50 | yytext(yyleng) = ch |
| 51 | 1984 |
| 52 | if(r .gt. 0){ |
| 53 | t = r + ich |
| 54 | if (t<= yytop){ |
| 55 | if (verif(t) .eq. state){ |
| 56 | if(advan(t) == YYERROR){ |
| 57 | call unput(yytext(yyleng)) |
| 58 | yyleng = yyleng - 1 |
| 59 | break |
| 60 | } |
| 61 | state = advan(t) |
| 62 | yylsta(lsp) = state |
| 63 | lsp = lsp +1 |
| 64 | goto 2001 |
| 65 | } |
| 66 | } |
| 67 | } |
| 68 | if(r < 0){ |
| 69 | t = r + ich |
| 70 | if (t <= yytop .and. verif(t) .eq. state){ |
| 71 | if(advan(t) == YYERROR){ |
| 72 | call unput(yytext(yyleng)) |
| 73 | yyleng = yyleng - 1 |
| 74 | break |
| 75 | } |
| 76 | state = advan(t) |
| 77 | yylsta(lsp) = state |
| 78 | lsp = lsp +1 |
| 79 | goto 2001 |
| 80 | } |
| 81 | t = r + match(ich) |
| 82 | if(t <= yytop && state == verif(t)){ |
| 83 | if(advan(t) == YYERROR){ |
| 84 | call unput(yytext(yyleng)) |
| 85 | yyleng = yyleng - 1 |
| 86 | break |
| 87 | } |
| 88 | state = advan(t) |
| 89 | yylsta(lsp) = state |
| 90 | lsp = lsp + 1 |
| 91 | goto 2001 |
| 92 | } |
| 93 | } |
| 94 | else { |
| 95 | if (state > 0) state = sfall(state) |
| 96 | if (state .gt. 0) r = stoff(state) |
| 97 | if (state .gt. 0 .and. r .ne. 0) |
| 98 | goto 1984 |
| 99 | call unput(yytext(yyleng)) |
| 100 | yyleng = yyleng -1 |
| 101 | break |
| 102 | } |
| 103 | 2001 |
| 104 | continue |
| 105 | } |
| 106 | while (lsp .gt. 1){ |
| 107 | lsp = lsp -1 |
| 108 | ilsp = yylsta(lsp) |
| 109 | yyfnd = atable(ilsp) |
| 110 | if (yyfnd .gt. 0) |
| 111 | if (vstop(yyfnd) .gt. 0){ |
| 112 | r = vstop(yyfnd) |
| 113 | if (extra(r) .ne. 0){ |
| 114 | for(;;){ |
| 115 | ilsp = yylsta(lsp) |
| 116 | if (yyback(atable(ilsp), -r) .eq. 1) |
| 117 | break |
| 118 | lsp= lsp -1 |
| 119 | call unput(yytext(yyleng)) |
| 120 | yyleng = yyleng -1 |
| 121 | } |
| 122 | } |
| 123 | yyprev = lexshf(yytext(yyleng)) |
| 124 | yylsp = lsp |
| 125 | yyfnd = yyfnd + 1 |
| 126 | yylook = r |
| 127 | yytext(yyleng+1) = 0 |
| 128 | return |
| 129 | } |
| 130 | call unput(yytext(yyleng)) |
| 131 | } |
| 132 | if (yytext(1) .eq. 0){ |
| 133 | yylook=0 |
| 134 | return |
| 135 | } |
| 136 | yyprev = input(dummy) |
| 137 | call output(yyprev) |
| 138 | yyprev = lexshf(yyprev) |
| 139 | yyleng = 0 |
| 140 | goto 1776 |
| 141 | end |
| 142 | integer function yyback (isub, n) |
| 143 | common /Lvstop/ vstop |
| 144 | integer vstop(Svstop) |
| 145 | if (isub .ne. 0) |
| 146 | while (vstop(isub) .ne. 0){ |
| 147 | if (vstop(isub) .eq. m){ |
| 148 | yyback = 1 |
| 149 | return |
| 150 | } |
| 151 | isub = isub + 1 |
| 152 | } |
| 153 | yyback = 0 |
| 154 | return |
| 155 | end |