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2898(than)S
3098(concatenation,)S
3709(and)S
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4467(higher)S
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4952(alterna-)S
2040 V
1080(tion)S
1265(('|').)S
1500(This)S
1708(pattern)S
2017(therefore)S
2411(matches)S
10 I
2770(either)S
10 R
3034(the)S
3186(string)S
3444("foo")S
10 I
3689(or)S
10 R
3807(the)S
3959(string)S
4216("ba")S
4421(followed)S
4807(by)S
4935(zero-or-)S
2160 V
1080(more)S
1312(r's.)S
1494(To)S
1631(match)S
1902("foo")S
2143(or)S
2252(zero-or-more)S
2810("bar"'s,)S
3144(use:)S
2400 V
1180(foo|(bar)*)S
2640 V
1080(and)S
1250(to)S
1353(match)S
1624(zero-or-more)S
2182("foo"'s-or-"bar"'s:)S
2880 V
1180((foo|bar)*)S
3168 V
1080(Some)S
1334(notes)S
1571(on)S
1696(patterns:)S
3336 V
1080(-)S
1440(A)S
1551(negated)S
1902(character)S
2311(class)S
2545(such)S
2767(as)S
2889(the)S
3050(example)S
3429("[303A-Z]")S
(above)240 3820 A
10 I
(will)151 4098 A
4287(match)S
4571(a)S
4659(newline)S
10 R
5010(unless)S
3456 V
1440("\n")S
1647((or)S
1812(an)S
1954(equivalent)S
2420(escape)S
2736(sequence))S
3186(is)S
3300(one)S
3492(of)S
3623(the)S
3793(characters)S
(explicitly)380 4250 A
4677(present)S
5014(in)S
5138(the)S
3576 V
1440(negated)S
1786(character)S
2190(class)S
2420((e.g.,)S
2658("[303A-Z\n]").)S
3207(This)S
3420(is)S
3521(unlike)S
3806(how)S
4013(many)S
4270(other)S
4511(regular)S
4831(expression)S
3696 V
1440(tools)S
1695(treat)S
1935(negated)S
2308(character)S
2739(classes,)S
3104(but)S
3292(unfortunately)S
3894(the)S
4076(inconsistency)S
4682(is)S
4808(historically)S
3816 V
1440(entrenched.)S
1977(Matching)S
2407(newlines)S
2810(means)S
3112(that)S
3308(a)S
3398(pattern)S
3724(like)S
3921([303"]*)S
4160(can)S
4346(match)S
4638(an)S
4779(entire)S
(input)206 5055 A
3936 V
1440((over257owing)S
1985(the)S
2133(scanner's)S
(input)206 2539 A
2770(buffer))S
3076(unless)S
3352(there's)S
3652(another)S
(quote)223 3979 A
4227(in)S
4330(the)S
(input.)231 4478 A
4104 V
1080(-)S
1440(A)S
1544(rule)S
1732(can)S
1903(have)S
2124(at)S
2228(most)S
2454(one)S
2631(instance)S
2993(of)S
(trailing)291 3109 A
3432(context)S
3760((the)S
3949('/')S
4077(operator)S
4445(or)S
4561(the)S
4716('$')S
4866(operator).)S
4224 V
1440(The)S
1626(start)S
(condition,)404 1828 A
('303',)127 2260 A
2415(and)S
2588("<<EOF>>")S
3117(patterns)S
3464(can)S
3632(only)S
3838(occur)S
4090(at)S
4191(the)S
4342(beginning)S
4771(of)S
4883(a)S
4956(pattern,)S
4344 V
1440(and,)S
1643(as)S
1760(well)S
1967(as)S
2084(with)S
2296('/')S
2425(and)S
2603('$',)S
(cannot)268 2779 A
3080(be)S
(grouped)329 3208 A
3570(inside)S
3843(parentheses.)S
4396(A)S
('303')102 4502 A
4637(which)S
4916(does)S
5133(not)S
4464 V
1440(occur)S
1691(at)S
1791(the)S
1941(beginning)S
2369(of)S
2480(a)S
2552(rule)S
2736(or)S
2847(a)S
2919('$')S
3064(which)S
3337(does)S
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3703(occur)S
3954(at)S
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4204(end)S
4376(of)S
4487(a)S
4559(rule)S
4743(loses)S
4971(its)S
5093(spe-)S
4584 V
1440(cial)S
1611(properties)S
2039(and)S
2209(is)S
2301(treated)S
2601(as)S
2710(a)S
2780(normal)S
3090(character.)S
4752 V
1440(The)S
1622(following)S
2038(are)S
(illegal:)280 2187 A
4992 V
1540(foo/bar$)S
5112 V
1540(<sc1>foo<sc2>bar)S
5352 V
1440(Note)S
1661(that)S
1837(the)S
1985(first)S
2173(of)S
2282(these,)S
2539(can)S
2704(be)S
(written)286 2824 A
3135("foo/bar\n".)S
5520 V
1440(The)S
1622(following)S
(will)157 2038 A
2220(result)S
2469(in)S
2572('$')S
2715(or)S
('303')102 2824 A
2951(being)S
3199(treated)S
3499(as)S
3608(a)S
3678(normal)S
3988(character:)S
5760 V
1540(foo|(bar$))S
5880 V
1540(foo|303bar)S
6120 V
1440(If)S
1540(what's)S
1841(wanted)S
2164(is)S
2263(a)S
2340("foo")S
2588(or)S
2704(a)S
(bar-followed-by-a-newline,)1112 2781 A
3925(the)S
4080(following)S
4503(could)S
4759(be)S
4887(used)S
5104((the)S
6240 V
1440(special)S
1745('|')S
1858(action)S
2129(is)S
2221(explained)S
2637(below):)S
6480 V
1540(foo)S
1824(|)S
6600 V
1540(bar$)S
1844(/*)S
1947(action)S
2218(goes)S
2427(here)S
2626(*/)S
6840 V
1440(A)S
1538(similar)S
1843(trick)S
(will)157 2053 A
2235(work)S
2467(for)S
2610(matching)S
3009(a)S
3079(foo)S
3238(or)S
3347(a)S
3417(bar-at-the-beginning-of-a-line.)S
7008 V
9 R
720(H)S
722(HO)S
790(OW)S
858(W)S
984(T)S
986(TH)S
1044(HE)S
1112(E)S
1208(I)S
1210(IN)S
1243(NP)S
1311(PU)S
1363(UT)S
1431(T)S
1527(I)S
1529(IS)S
1562(S)S
1652(M)S
1654(MA)S
1736(AT)S
1804(TC)S
1862(CH)S
1924(HE)S
1992(ED)S
2050(D)S
7128 V
10 R
1080(When)S
1349(the)S
1501(generated)S
1922(scanner)S
2259(is)S
2355(run,)S
2543(it)S
2628(analyzes)S
3004(its)S
(input)206 3128 A
(looking)306 3363 A
3698(for)S
3845(strings)S
4142(which)S
4417(match)S
4692(any)S
4866(of)S
4979(its)S
5104(pat-)S
7248 V
1080(terns.)S
1352(If)S
1446(it)S
1528(finds)S
1755(more)S
1988(than)S
2186(one)S
2356(match,)S
2652(it)S
2733(takes)S
2965(the)S
3113(one)S
3283(matching)S
3682(the)S
3830(most)S
4050(text)S
4226((for)S
(trailing)291 4403 A
4719(context)S
5040(rules,)S
7368 V
1080(this)S
1252(includes)S
1614(the)S
1764(length)S
2042(of)S
2153(the)S
(trailing)291 2303 A
2621(part,)S
2830(even)S
(though)278 3047 A
3352(it)S
(will)157 3435 A
3619(then)S
3819(be)S
3941(returned)S
4305(to)S
4411(the)S
(input).)265 4562 A
4880(If)S
4976(it)S
5060(finds)S
7488 V
1080(two)S
1256(or)S
1365(more)S
1597(matches)S
1952(of)S
2061(the)S
2209(same)S
2441(length,)S
2742(the)S
2890(rule)S
3072(listed)S
3315(first)S
3503(in)S
3606(the)S
10 I
3754(flex)S
10 R
(input)206 3925 A
4156(file)S
4316(is)S
4408(chosen.)S
7903 V
720(Page)S
941(5)S
2681(()S
2723(26)S
2848(May)S
(1990)200 3057 A
3265())S
4455(September)S
4911(13,)S
(1996)200 5061 A
8143 V
EP
%%Page: 6 6
BP
/slant 0 def
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480 V
10 R
720(FLEX)S
981(()S
1023(1)S
1081())S
2756(Version)S
3100(2.3)S
4866(FLEX)S
5127(()S
5169(1)S
5227())S
960 V
1080(Once)S
1321(the)S
1472(match)S
1746(is)S
1841(determined,)S
2347(the)S
2499(text)S
(corresponding)575 2679 A
3283(to)S
3390(the)S
3542(match)S
3817((called)S
4121(the)S
10 I
4273(token))S
10 R
4554(is)S
4650(made)S
4897(available)S
1080 V
1080(in)S
1215(the)S
1395(global)S
1703(character)S
2131(pointer)S
10 B
2473(yytext,)S
10 R
2818(and)S
3020(its)S
3172(length)S
3480(in)S
3615(the)S
3794(global)S
4101(integer)S
10 B
4437(yyleng.)S
10 R
4797(The)S
10 I
5010(action)S
1200 V
10 R
(corresponding)575 1080 A
1683(to)S
1789(the)S
1941(matched)S
2311(pattern)S
2620(is)S
2716(then)S
2918(executed)S
3305((a)S
3413(more)S
3649(detailed)S
3997(description)S
4473(of)S
4586(actions)S
4900(follows),)S
1320 V
1080(and)S
1250(then)S
1448(the)S
1596(remaining)S
(input)206 2029 A
2260(is)S
2352(scanned)S
2701(for)S
2844(another)S
3171(match.)S
1488 V
1080(If)S
1185(no)S
1322(match)S
1605(is)S
(found,)259 1709 A
2005(then)S
2215(the)S
10 I
2375(default)S
2691(rule)S
10 R
2890(is)S
2994(executed:)S
3418(the)S
3579(next)S
3790(character)S
4199(in)S
4315(the)S
(input)206 4476 A
4720(is)S
4825(considered)S
1608 V
1080(matched)S
1446(and)S
1616(copied)S
1909(to)S
2012(the)S
2160(standard)S
2526(output.)S
2857(Thus,)S
3108(the)S
3256(simplest)S
3616(legal)S
10 I
3837(flex)S
10 R
(input)206 4008 A
4239(is:)S
1848 V
1180(%%)S
2088 V
1080(which)S
1351(generates)S
1757(a)S
1827(scanner)S
2160(that)S
2336(simply)S
2634(copies)S
2916(its)S
(input)206 3036 A
3267((one)S
3471(character)S
3867(at)S
3965(a)S
4035(time))S
4273(to)S
4376(its)S
4496(output.)S
2256 V
9 R
720(A)S
722(AC)S
790(CT)S
852(TI)S
910(IO)S
943(ON)S
1011(NS)S
1079(S)S
2376 V
10 R
1080(Each)S
1310(pattern)S
1618(in)S
1724(a)S
1797(rule)S
1982(has)S
2144(a)S
(corresponding)575 2217 A
2820(action,)S
3119(which)S
3393(can)S
3561(be)S
3684(any)S
3857(arbitrary)S
4234(C)S
4330(statement.)S
4795(The)S
4981(pattern)S
2496 V
1080(ends)S
1294(at)S
1397(the)S
1550(first)S
(non-escaped)503 1743 A
(whitespace)448 2276 A
2754(character;)S
3183(the)S
3336(remainder)S
3775(of)S
3889(the)S
4041(line)S
4221(is)S
4317(its)S
4441(action.)S
4766(If)S
4863(the)S
5015(action)S
2616 V
1080(is)S
1180(empty,)S
1489(then)S
1695(when)S
1946(the)S
2102(pattern)S
2415(is)S
2515(matched)S
2889(the)S
(input)206 3045 A
3284(token)S
3540(is)S
3640(simply)S
3946(discarded.)S
4415(For)S
4588(example,)S
4987(here)S
5194(is)S
2736 V
1080(the)S
1228(specification)S
1768(for)S
1911(a)S
1981(program)S
2347(which)S
2618(deletes)S
2923(all)S
3049(occurrences)S
3556(of)S
3665("zap)S
3871(me")S
4060(from)S
4281(its)S
(input:)234 4401 A
2976 V
1180(%%)S
3096 V
1180("zap)S
1386(me")S
3336 V
1080((It)S
(will)157 1211 A
(copy)195 1403 A
1633(all)S
1769(other)S
2011(characters)S
2456(in)S
2569(the)S
(input)206 2727 A
2968(to)S
3082(the)S
3241(output)S
3533(since)S
3776(they)S
(will)157 3985 A
4178(be)S
4309(matched)S
4686(by)S
4822(the)S
4981(default)S
3456 V
1080(rule.))S
3624 V
1080(Here)S
1303(is)S
1396(a)S
1467(program)S
1834(which)S
2106(compresses)S
(multiple)335 2596 A
2957(blanks)S
3245(and)S
3417(tabs)S
3606(down)S
3856(to)S
3961(a)S
4033(single)S
4300(blank,)S
4575(and)S
4747(throws)S
5048(away)S
3744 V
(whitespace)448 1080 A
(found)234 1553 A
1812(at)S
1910(the)S
2058(end)S
2228(of)S
2337(a)S
2407(line:)S
3984 V
1180(%%)S
4104 V
1180([)S
1239(\t]+)S
1586(putchar()S
1947(')S
2006(')S
2065();)S
4224 V
1180([)S
1239(\t]+$)S
1611(/*)S
(ignore)257 1714 A
1996(this)S
2166(token)S
2414(*/)S
4512 V
1080(If)S
1185(the)S
1345(action)S
1628(contains)S
2000(a)S
2082('{',)S
2260(then)S
2470(the)S
2630(action)S
2913(spans)S
(till)112 3173 A
3322(the)S
3482(balancing)S
3910('}')S
4063(is)S
(found,)259 4167 A
4463(and)S
4645(the)S
4805(action)S
5088(may)S
4632 V
1080(cross)S
(multiple)335 1322 A
1692(lines.)S
10 I
1967(flex)S
10 R
(knows)262 2148 A
(about)223 2445 A
2703(C)S
2805(strings)S
3107(and)S
3286(comments)S
3733(and)S
3912(won't)S
4181(be)S
4310(fooled)S
4601(by)S
(braces)258 4735 A
(found)234 5027 A
4752 V
1080(within)S
1366(them,)S
1621(but)S
1778(also)S
1969(allows)S
2261(actions)S
2575(to)S
2682(begin)S
2934(with)S
10 B
3142(%{)S
10 R
3311(and)S
(will)157 3485 A
3671(consider)S
4041(the)S
4193(action)S
4468(to)S
4575(be)S
4699(all)S
4829(the)S
4981(text)S
5161(up)S
4872 V
1080(to)S
1183(the)S
1331(next)S
10 B
1529(%})S
10 R
1694((regardless)S
2162(of)S
2271(ordinary)S
(braces)258 2637 A
2920(inside)S
3185(the)S
3333(action).)S
5040 V
1080(An)S
1240(action)S
1523(consisting)S
1968(solely)S
2246(of)S
2368(a)S
2451(vertical)S
2792(bar)S
2959(('|'))S
3153(means)S
3448("same)S
3734(as)S
3856(the)S
4017(action)S
4301(for)S
4457(the)S
4618(next)S
4829(rule.")S
5115(See)S
5160 V
1080(below)S
1351(for)S
1494(an)S
(illustration.)461 1614 A
5328 V
1080(Actions)S
1419(can)S
1585(include)S
1907(arbitrary)S
2282(C)S
2376(code,)S
2618(including)S
10 B
3024(return)S
10 R
3332(statements)S
3784(to)S
3889(return)S
4157(a)S
4229(value)S
4474(to)S
4579(whatever)S
4976(routine)S
5448 V
1080(called)S
10 B
1347(yylex().)S
10 R
1689(Each)S
1917(time)S
10 B
2122(yylex())S
10 R
2439(is)S
2532(called)S
2799(it)S
2881(continues)S
3292(processing)S
3748(tokens)S
4035(from)S
4256(where)S
4528(it)S
4609(last)S
4774(left)S
4934(off)S
(until)184 5077 A
5568 V
1080(it)S
1166(either)S
(reaches)303 1426 A
1759(the)S
1912(end)S
2087(of)S
2201(the)S
2354(file)S
2519(or)S
2633(executes)S
3010(a)S
3085(return.)S
3406(Once)S
3650(it)S
(reaches)303 3737 A
4071(an)S
(end-of-file,)457 4197 A
4685(however,)S
5088(then)S
5688 V
1080(any)S
1263(subsequent)S
1747(call)S
1931(to)S
10 B
2047(yylex())S
10 R
(will)157 2376 A
2571(simply)S
2882(immediately)S
3423(return,)S
3727(unless)S
10 B
(yyrestart())460 4016 A
10 R
4514(is)S
4619(first)S
4820(called)S
5098((see)S
5808 V
1080(below).)S
5976 V
1080(Actions)S
1418(are)S
1567(not)S
1720(allowed)S
2064(to)S
2167(modify)S
2482(yytext)S
2758(or)S
2867(yyleng.)S
6144 V
1080(There)S
1341(are)S
1490(a)S
1560(number)S
1892(of)S
2001(special)S
2306(directives)S
2723(which)S
2994(can)S
3159(be)S
3279(included)S
3650(within)S
3932(an)S
4052(action:)S
6312 V
1080(-)S
10 B
1440(ECHO)S
10 R
1761(copies)S
2043(yytext)S
2319(to)S
2422(the)S
2570(scanner's)S
2976(output.)S
6480 V
1080(-)S
10 B
1440(BEGIN)S
10 R
1789(followed)S
2172(by)S
2297(the)S
2445(name)S
2688(of)S
2797(a)S
2867(start)S
(condition)379 3067 A
(places)252 3472 A
3750(the)S
3899(scanner)S
4233(in)S
4337(the)S
(corresponding)575 4486 A
5087(start)S
6600 V
(condition)379 1440 A
1844((see)S
2032(below).)S
6768 V
1080(-)S
10 B
1440(REJECT)S
10 R
1865(directs)S
2162(the)S
2313(scanner)S
2649(to)S
(proceed)319 2755 A
3103(on)S
3232(to)S
3339(the)S
("second)320 3491 A
3840(best")S
4072(rule)S
4258(which)S
4533(matched)S
4903(the)S
(input)206 5055 A
6888 V
1440((or)S
1608(a)S
1703(pre256x)S
1988(of)S
2122(the)S
(input).)265 2295 A
2635(The)S
2841(rule)S
3047(is)S
3163(chosen)S
3491(as)S
3624(described)S
(above)240 4059 A
4348(in)S
4475("How)S
4761(the)S
(Input)212 4933 A
5194(is)S
7008 V
1440(Matched",)S
1884(and)S
10 B
2055(yytext)S
10 R
2344(and)S
10 B
2515(yyleng)S
10 R
2820(set)S
2958(up)S
3084(appropriately.)S
3697(It)S
3785(may)S
3985(either)S
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EP
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4215((see)S
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4956(default,)S
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4872(yylex())S
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1447(as)S
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1180(int)S
1311(yylex())S
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2190(lexscan()S
2551(a,)S
2646(b)S
2721())S
2780(257oat)S
2984(a,)S
3079(b;)S
1680 V
1080(to)S
1194(give)S
1403(the)S
1562(scanning)S
1955(routine)S
2276(the)S
2435(name)S
10 I
2690(lexscan,)S
10 R
3054(returning)S
3460(a)S
3542(257oat,)S
3783(and)S
3965(taking)S
4253(two)S
4441(257oats)S
4696(as)S
4817(arguments.)S
1800 V
1080(Note)S
1315(that)S
1505(if)S
(you)150 1606 A
1795(give)S
2007(arguments)S
2465(to)S
2582(the)S
2743(scanning)S
3138(routine)S
3461(using)S
3716(a)S
(K&R-style/non-prototyped)1089 3799 A
4926(function)S
1920 V
1080(declaration,)S
(you)150 1578 A
1753(must)S
1973(terminate)S
2379(the)S
(de256nition)385 2527 A
2937(with)S
3141(a)S
3211(semi-colon)S
3683((;).)S
2088 V
1080(Whenever)S
10 B
1524(yylex())S
10 R
1845(is)S
1942(called,)S
2238(it)S
2324(scans)S
2572(tokens)S
2864(from)S
3090(the)S
3243(global)S
(input)206 3524 A
3760(256le)S
10 I
3920(yyin)S
10 R
4119((which)S
4430(defaults)S
4780(to)S
4889(stdin).)S
5199(It)S
2208 V
1080(continues)S
(until)184 1491 A
1701(it)S
1783(either)S
(reaches)303 2039 A
2368(an)S
2489(end-of-256le)S
2941((at)S
3074(which)S
3346(point)S
3578(it)S
3660(returns)S
3966(the)S
4115(value)S
4359(0))S
4468(or)S
4577(one)S
4747(of)S
4856(its)S
4976(actions)S
2328 V
1080(executes)S
1454(a)S
10 I
1526(return)S
10 R
1804(statement.)S
2267(In)S
2378(the)S
2528(former)S
2830(case,)S
3056(when)S
3302(called)S
3571(again)S
3817(the)S
3968(scanner)S
(will)157 4304 A
4489(immediately)S
5020(return)S
2448 V
1080(unless)S
10 B
(yyrestart())460 1371 A
10 R
1871(is)S
1977(called)S
2257(to)S
2374(point)S
10 I
2619(yyin)S
10 R
2826(at)S
2938(the)S
3100(new)S
(input)206 3307 A
3552(256le.)S
3770(()S
10 B
(yyrestart())460 3843 A
10 R
4342(takes)S
4588(one)S
4772(argument,)S
5216(a)S
2568 V
10 B
1080(FILE)S
1350(*)S
10 R
1435(pointer.))S
1839(In)S
1958(the)S
2116(latter)S
2359(case)S
2568((i.e.,)S
2785(when)S
3038(an)S
3168(action)S
3449(executes)S
3831(a)S
3911(return),)S
4246(the)S
4404(scanner)S
4748(may)S
4957(then)S
5166(be)S
2688 V
1080(called)S
1346(again)S
1589(and)S
1759(it)S
(will)157 1840 A
2022(resume)S
2338(scanning)S
2720(where)S
2992(it)S
3073(left)S
3233(off.)S
2856 V
1080(By)S
1224(default)S
1531((and)S
1737(for)S
1883(purposes)S
2268(of)S
2380(ef256ciency),)S
2865(the)S
3016(scanner)S
3352(uses)S
3553(block-reads)S
4051(rather)S
4315(than)S
4516(simple)S
10 I
4812(getc())S
10 R
5076(calls)S
2976 V
1080(to)S
1196(read)S
1408(characters)S
1856(from)S
10 I
2090(yyin.)S
10 R
2321(The)S
2515(nature)S
2804(of)S
2925(how)S
3135(it)S
3228(gets)S
3427(its)S
(input)206 3559 A
3802(can)S
3979(be)S
4111(controlled)S
4556(by)S
4693(rede256ning)S
5138(the)S
3096 V
10 B
1080(YY_INPUT)S
10 R
1622(macro.)S
1957(YY_INPUT's)S
(calling)274 2557 A
2864(sequence)S
3266(is)S
3366("YY_INPUT(buf,result,max_size)".)S
4881(Its)S
5015(action)S
3216 V
1080(is)S
1177(to)S
(place)213 1285 A
1528(up)S
1658(to)S
10 I
1766(max_size)S
10 R
2165(characters)S
2605(in)S
2713(the)S
2866(character)S
3267(array)S
10 I
3505(buf)S
10 R
3663(and)S
3838(return)S
4109(in)S
4217(the)S
4369(integer)S
4678(variable)S
10 I
5032(result)S
3336 V
10 R
1080(either)S
1340(the)S
1494(number)S
1832(of)S
1947(characters)S
2388(read)S
2593(or)S
2708(the)S
2862(constant)S
3228(YY_NULL)S
3725((0)S
3840(on)S
3971(Unix)S
4203(systems))S
4586(to)S
4695(indicate)S
5045(EOF.)S
3456 V
1080(The)S
1262(default)S
1567(YY_INPUT)S
2086(reads)S
2324(from)S
2545(the)S
2693(global)S
2969(256le-pointer)S
3442("yyin".)S
3624 V
1080(A)S
1178(sample)S
(rede256nition)464 1488 A
1977(of)S
2086(YY_INPUT)S
2605((in)S
2742(the)S
(de256nitions)424 2890 A
3339(section)S
3649(of)S
3758(the)S
(input)206 3906 A
4137(256le):)S
3864 V
1180(%{)S
3984 V
(#undef)279 1180 A
1484(YY_INPUT)S
4104 V
1180(#de256ne)S
1501(YY_INPUT(buf,result,max_size))S
2876(\)S
4224 V
1280({)S
1353(\)S
4344 V
1280(int)S
1411(c)S
1481(=)S
(getchar();)393 1563 A
1981(\)S
4464 V
1280(result)S
1529(=)S
1611((c)S
1715(==)S
1854(EOF))S
2104(?)S
2174(YY_NULL)S
2665(:)S
2718((buf[0])S
3029(=)S
3111(c,)S
3206(1);)S
3343(\)S
4584 V
1280(})S
4704 V
1180(%})S
4944 V
1080(This)S
(de256nition)385 1284 A
(will)157 1694 A
1876(change)S
2186(the)S
(input)206 2334 A
2565(processing)S
3020(to)S
3123(occur)S
3372(one)S
3542(character)S
3938(at)S
4036(a)S
4106(time.)S
5112 V
1080(You)S
1282(also)S
1473(can)S
1643(add)S
1818(in)S
1926(things)S
2201(like)S
2382(keeping)S
2730(track)S
2962(of)S
3076(the)S
(input)206 3229 A
3465(line)S
3646(number)S
3983(this)S
4158(way;)S
4384(but)S
(don't)212 4542 A
4784(expect)S
(your)184 5077 A
5232 V
1080(scanner)S
1413(to)S
1516(go)S
1641(very)S
1845(fast.)S
5400 V
1080(When)S
1360(the)S
1523(scanner)S
(receives)331 1871 A
2242(an)S
2377(end-of-256le)S
2843(indication)S
3285(from)S
3521(YY_INPUT,)S
4080(it)S
4176(then)S
4390(checks)S
4705(the)S
10 B
4869(yywrap())S
5520 V
10 R
1080(function.)S
1496(If)S
10 B
1595(yywrap())S
10 R
2018(returns)S
2329(false)S
2551((zero),)S
2849(then)S
3053(it)S
3140(is)S
3238(assumed)S
3615(that)S
3797(the)S
3951(function)S
4317(has)S
(gone)195 4482 A
4708(ahead)S
4974(and)S
5149(set)S
5640 V
1080(up)S
10 I
1217(yyin)S
10 R
1422(to)S
1538(point)S
1782(to)S
1898(another)S
(input)206 2238 A
2482(256le,)S
2674(and)S
2857(scanning)S
3252(continues.)S
3725(If)S
3831(it)S
3925(returns)S
4243(true)S
((non-zero),)451 4438 A
4927(then)S
5138(the)S
5760 V
1080(scanner)S
1413(terminates,)S
1883(returning)S
2277(0)S
2352(to)S
2455(its)S
2575(caller.)S
5928 V
1080(The)S
1262(default)S
10 B
1567(yywrap())S
10 R
1984(always)S
2289(returns)S
2594(1.)S
2719(Presently,)S
3145(to)S
3249(rede256ne)S
3600(it)S
(you)150 3682 A
3858(must)S
4079(256rst)S
("#undef)320 4262 A
4608(yywrap",)S
5002(as)S
5112(it)S
5194(is)S
6048 V
1080(currently)S
1481(implemented)S
2043(as)S
2164(a)S
2246(macro.)S
2585(As)S
2734(indicated)S
3140(by)S
3277(the)S
3437(hedging)S
3797(in)S
3912(the)S
4072(previous)S
4455(sentence,)S
4864(it)S
4957(may)S
5166(be)S
6168 V
1080(changed)S
1440(to)S
1543(a)S
1613(true)S
1795(function)S
2155(in)S
2258(the)S
2406(near)S
2605(future.)S
6336 V
1080(The)S
1269(scanner)S
1609(writes)S
1888(its)S
10 B
2015(ECHO)S
10 R
2343(output)S
2631(to)S
2741(the)S
10 I
2896(yyout)S
10 R
3147(global)S
3431((default,)S
(stdout),)304 3803 A
4140(which)S
4419(may)S
4625(be)S
4753(rede256ned)S
5161(by)S
6456 V
1080(the)S
1228(user)S
1421(simply)S
1719(by)S
1844(assigning)S
2248(it)S
2329(to)S
2432(some)S
2669(other)S
10 B
2901(FILE)S
10 R
3161(pointer.)S
6624 V
9 R
720(S)S
722(ST)S
774(TA)S
832(AR)S
900(RT)S
962(T)S
1058(C)S
1060(CO)S
1122(ON)S
1190(ND)S
1258(DI)S
1326(IT)S
1359(TI)S
1417(IO)S
1450(ON)S
1518(NS)S
1586(S)S
6744 V
10 I
1080(257ex)S
10 R
1252(provides)S
1630(a)S
1707(mechanism)S
2197(for)S
(conditionally)530 2348 A
2911(activating)S
3341(rules.)S
3620(Any)S
3826(rule)S
4016(whose)S
4306(pattern)S
4619(is)S
4719(pre256xed)S
5082(with)S
6864 V
1080("<sc>")S
(will)157 1385 A
1567(only)S
1770(be)S
1890(active)S
2156(when)S
2399(the)S
2547(scanner)S
2880(is)S
2972(in)S
3075(the)S
3223(start)S
(condition)379 3422 A
3826(named)S
4119("sc".)S
4360(For)S
4525(example,)S
7104 V
1180(<STRING>[303"]*)S
2052({)S
2125(/*)S
2228(eat)S
2371(up)S
2496(the)S
2644(string)S
(body)200 2898 A
(...)75 3123 A
3223(*/)S
7224 V
(...)75 1480 A
7344 V
1480(})S
7903 V
720(Page)S
941(9)S
2681(()S
2723(26)S
2848(May)S
(1990)200 3057 A
3265())S
4455(September)S
4911(13,)S
(1996)200 5061 A
8143 V
EP
%%Page: 10 10
BP
/slant 0 def
/height 0 def
480 V
10 R
720(FLEX)S
981(()S
1023(1)S
1081())S
2756(Version)S
3100(2.3)S
4866(FLEX)S
5127(()S
5169(1)S
5227())S
960 V
(will)157 1080 A
1262(be)S
1382(active)S
1648(only)S
1851(when)S
2094(the)S
2242(scanner)S
2575(is)S
2667(in)S
2770(the)S
2918("STRING")S
3390(start)S
(condition,)404 3589 A
4018(and)S
1200 V
(<INITIAL,STRING,QUOTE>\.)1297 1180 A
2677({)S
2750(/*)S
2853(handle)S
3146(an)S
3266(escape)S
(...)75 3560 A
3660(*/)S
1320 V
(...)75 1480 A
1440 V
1480(})S
1680 V
(will)157 1080 A
1262(be)S
1382(active)S
1648(only)S
1851(when)S
2094(the)S
2242(current)S
2553(start)S
(condition)379 2752 A
3156(is)S
3248(either)S
3503("INITIAL",)S
4007("STRING",)S
4504(or)S
("QUOTE".)450 4613 A
1848 V
1080(Start)S
(conditions)418 1300 A
1747(are)S
1901(declared)S
2273(in)S
2381(the)S
(de256nitions)424 2534 A
2988((256rst))S
3243(section)S
3558(of)S
3672(the)S
(input)206 3825 A
4061(using)S
4308(unindented)S
4784(lines)S
5004(begin-)S
1968 V
1080(ning)S
1286(with)S
1493(either)S
10 B
1751(%s)S
10 R
1918(or)S
10 B
2030(%x)S
10 R
2208(followed)S
2594(by)S
2721(a)S
2793(list)S
2943(of)S
3054(names.)S
3388(The)S
3572(former)S
3874(declares)S
10 I
4232(inclusive)S
10 R
4617(start)S
(conditions,)443 4818 A
2088 V
1080(the)S
1235(latter)S
10 I
(exclusive)370 1475 A
10 R
1877(start)S
(conditions.)443 2083 A
2584(A)S
2690(start)S
(condition)379 2897 A
3309(is)S
3409(activated)S
3806(using)S
4056(the)S
10 B
4212(BEGIN)S
10 R
4569(action.)S
(Until)207 4898 A
5138(the)S
2208 V
1080(next)S
10 B
1283(BEGIN)S
10 R
1636(action)S
1911(is)S
2007(executed,)S
2419(rules)S
2644(with)S
2852(the)S
3004(given)S
3256(start)S
(condition)379 3459 A
(will)157 3867 A
4053(be)S
4177(active)S
4447(and)S
4621(rules)S
4846(with)S
5054(other)S
2328 V
1080(start)S
(conditions)418 1281 A
(will)157 1726 A
1910(be)S
2032(inactive.)S
2428(If)S
2523(the)S
2673(start)S
(condition)379 2874 A
3280(is)S
10 I
3374(inclusive,)S
10 R
3784(then)S
3984(rules)S
4207(with)S
4413(no)S
4540(start)S
(conditions)418 4742 A
5188(at)S
2448 V
1080(all)S
(will)157 1209 A
1394(also)S
1584(be)S
1707(active.)S
2026(If)S
2122(it)S
2206(is)S
10 I
(exclusive,)395 2301 A
10 R
2724(then)S
10 I
2924(only)S
10 R
3124(rules)S
3347(quali256ed)S
3726(with)S
3932(the)S
4082(start)S
(condition)379 4283 A
(will)157 4689 A
4873(be)S
4995(active.)S
2568 V
1080(A)S
1180(set)S
1319(of)S
1430(rules)S
1653(contingent)S
2104(on)S
2231(the)S
2381(same)S
2615(exclusive)S
3022(start)S
(condition)379 3223 A
3629(describe)S
3992(a)S
4065(scanner)S
4401(which)S
4675(is)S
4770(independent)S
2688 V
1080(of)S
1199(any)S
1379(of)S
1498(the)S
1656(other)S
1898(rules)S
2129(in)S
2241(the)S
10 I
2398(257ex)S
10 R
(input.)231 2572 A
(Because)336 2862 A
3232(of)S
3350(this,)S
3554(exclusive)S
3968(start)S
(conditions)418 4176 A
4628(make)S
4880(it)S
4970(easy)S
5183(to)S
2808 V
1080(specify)S
1405("mini-scanners")S
2086(which)S
2366(scan)S
2579(portions)S
2942(of)S
3060(the)S
(input)206 3217 A
3457(that)S
3642(are)S
3800(syntactically)S
4343(different)S
4726(from)S
4957(the)S
5115(rest)S
2928 V
1080((e.g.,)S
1309(comments).)S
3096 V
1080(If)S
1177(the)S
1329(distinction)S
1782(between)S
2148(inclusive)S
2541(and)S
2716(exclusive)S
3126(start)S
(conditions)418 3330 A
3778(is)S
(still)151 3875 A
4056(a)S
(little)185 4131 A
4346(vague,)S
4641(here's)S
4918(a)S
4993(simple)S
3216 V
1080(example)S
(illustrating)436 1446 A
1907(the)S
(connection)441 2055 A
2521(between)S
2882(the)S
3030(two.)S
3256(The)S
3438(set)S
3575(of)S
3684(rules:)S
3456 V
1180(%s)S
1328(example)S
3576 V
1180(%%)S
3696 V
1180(<example>foo)S
2044(/*)S
2147(do)S
2272(something)S
2715(*/)S
3936 V
1080(is)S
1172(equivalent)S
1616(to)S
4176 V
1180(%x)S
1339(example)S
4296 V
1180(%%)S
4416 V
1180(<INITIAL,example>foo)S
2241(/*)S
2344(do)S
2469(something)S
2912(*/)S
4704 V
1080(The)S
1262(default)S
1567(rule)S
1749((to)S
10 B
1886(ECHO)S
10 R
2207(any)S
2377(unmatched)S
2843(character))S
3273(remains)S
3617(active)S
3883(in)S
3986(start)S
(conditions.)443 4185 A
4872 V
10 B
1080(BEGIN(0))S
10 R
1556(returns)S
1870(to)S
1982(the)S
2139(original)S
2486(state)S
2705(where)S
2986(only)S
3198(the)S
3355(rules)S
3586(with)S
3800(no)S
3935(start)S
(conditions)418 4144 A
4597(are)S
4756(active.)S
5082(This)S
4992 V
1080(state)S
1300(can)S
1475(also)S
1672(be)S
1802(referred)S
2158(to)S
2271(as)S
2390(the)S
(start-condition)587 2548 A
3170("INITIAL",)S
3683(so)S
10 B
3806(BEGIN(INITIAL))S
10 R
4629(is)S
4730(equivalent)S
5183(to)S
5112 V
10 B
1080(BEGIN(0).)S
10 R
1575((The)S
1794(parentheses)S
(around)279 2293 A
2601(the)S
2753(start)S
(condition)379 2956 A
3364(name)S
3611(are)S
3764(not)S
3921(required)S
4286(but)S
4443(are)S
4596(considered)S
(good)200 5061 A
5232 V
1080(style.))S
5400 V
10 B
1080(BEGIN)S
10 R
1432(actions)S
1745(can)S
1914(also)S
2105(be)S
2229(given)S
2481(as)S
2594(indented)S
2969(code)S
3188(at)S
3290(the)S
3442(beginning)S
3872(of)S
3985(the)S
4137(rules)S
4362(section.)S
4726(For)S
4895(example,)S
5520 V
1080(the)S
1232(following)S
(will)157 1652 A
1838(cause)S
2091(the)S
2243(scanner)S
2580(to)S
2687(enter)S
2918(the)S
3070("SPECIAL")S
3591(start)S
(condition)379 3794 A
4201(whenever)S
10 I
4621(yylex())S
10 R
4925(is)S
5020(called)S
5640 V
1080(and)S
1250(the)S
1398(global)S
1674(variable)S
10 I
2024(enter_special)S
10 R
2591(is)S
2683(true:)S
5880 V
1380(int)S
1511(enter_special;)S
6120 V
1180(%x)S
1339(SPECIAL)S
6240 V
1180(%%)S
6360 V
1380(if)S
1467(()S
1526(enter_special)S
2083())S
6480 V
1480(BEGIN(SPECIAL);)S
6720 V
1180(<SPECIAL>blahblahblah)S
6840 V
(...more)282 1180 A
1487(rules)S
(follow...)338 1708 A
7128 V
1080(To)S
(illustrate)353 1222 A
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1080(of)S
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1238(integer)S
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2231(257oating-point)S
2803(number)S
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7903 V
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1176(13,)S
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2681(()S
2723(26)S
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3265())S
4940(Page)S
5161(10)S
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2760 V
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3720 V
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1512(printf()S
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4320 V
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4328(next)S
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10 I
2661(257ex)S
10 R
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3221(a)S
3303(mechanism)S
3798(for)S
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4315(and)S
4497(switching)S
4925(between)S
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2032(An)S
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3217(using:)S
3936 V
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3676())S
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10 R
4126(for)S
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4474(size).)S
4768(It)S
4883(returns)S
5216(a)S
4416 V
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1080(YY_BUFFER_STATE)S
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3818(routines:)S
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4861(Note)S
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2374(yyin)S
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2665(it.)S
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5904 V
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1080(new)S
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1437(delete)S
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6480 V
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6720 V
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6960 V
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10 R
2507(action;)S
7200 V
1080(-)S
1440(or,)S
1574(switching)S
1990(to)S
2093(a)S
2163(new)S
2356(buffer)S
2628(using)S
10 B
(yy_switch_to_buffer())947 2870 A
10 R
3842(as)S
3951(shown)S
4238(in)S
4341(the)S
4489(example)S
(above.)265 4855 A
7368 V
1080(<<EOF>>)S
1525(rules)S
1747(may)S
1946(not)S
2100(be)S
2221(used)S
2431(with)S
2636(other)S
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3640(only)S
3844(be)S
3965(quali256ed)S
4343(with)S
4548(a)S
4620(list)S
4770(of)S
4881(start)S
5082(con-)S
7488 V
(ditions.)298 1080 A
1431(If)S
1527(an)S
(unquali256ed)452 1650 A
2130(<<EOF>>)S
2577(rule)S
2761(is)S
2855(given,)S
3130(it)S
3213(applies)S
3525(to)S
10 I
3630(all)S
10 R
3763(start)S
(conditions)418 3964 A
4409(which)S
4682(do)S
4809(not)S
4964(already)S
7903 V
720(Page)S
941(13)S
2681(()S
2723(26)S
2848(May)S
(1990)200 3057 A
3265())S
4455(September)S
4911(13,)S
(1996)200 5061 A
8143 V
EP
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480 V
10 R
720(FLEX)S
981(()S
1023(1)S
1081())S
2756(Version)S
3100(2.3)S
4866(FLEX)S
5127(()S
5169(1)S
5227())S
960 V
1080(have)S
1295(<<EOF>>)S
1739(actions.)S
2099(To)S
2236(specify)S
2552(an)S
2672(<<EOF>>)S
3116(rule)S
3298(for)S
3441(only)S
3644(the)S
(initial)235 3792 A
4052(start)S
(condition,)404 4251 A
4680(use)S
1200 V
(<INITIAL><<EOF>>)905 1180 A
1488 V
1080(These)S
1346(rules)S
1567(are)S
1716(useful)S
1987(for)S
2130(catching)S
2496(things)S
2766(like)S
2942(unclosed)S
3324(comments.)S
3812(An)S
3960(example:)S
1728 V
1180(%x)S
(quote)223 1339 A
1848 V
1180(%%)S
2088 V
(...other)282 1180 A
1487(rules)S
1708(for)S
1851(dealing)S
2172(with)S
(quotes...)337 2376 A
2328 V
(<quote><<EOF>>)756 1180 A
2011({)S
2448 V
1405(error()S
1661("unterminated)S
(quote")264 2258 A
2547();)S
2568 V
1405(yyterminate();)S
2688 V
1405(})S
2808 V
1180(<<EOF>>)S
1649({)S
2928 V
1405(if)S
1492(()S
1551(*++256lelist)S
1992())S
3048 V
1505({)S
3168 V
1505(yyin)S
1708(=)S
1790(fopen()S
2078(*256lelist,)S
2430("r")S
2571();)S
3288 V
1505(YY_NEW_FILE;)S
3408 V
1505(})S
3528 V
1405(else)S
3648 V
1480(yyterminate();)S
3768 V
1405(})S
4056 V
9 R
720(M)S
722(MI)S
804(IS)S
837(SC)S
889(CE)S
951(EL)S
1009(LL)S
1067(LA)S
1125(AN)S
1193(NE)S
1261(EO)S
1319(OU)S
1387(US)S
1455(S)S
1545(M)S
1547(MA)S
1629(AC)S
1697(CR)S
1759(RO)S
1821(OS)S
1889(S)S
4176 V
10 R
1080(The)S
1263(macro)S
10 B
1541(YY_USER_ACTION)S
10 R
2485(can)S
2651(be)S
2772(rede256ned)S
3173(to)S
3277(provide)S
3611(an)S
3733(action)S
4006(which)S
4279(is)S
4373(always)S
4680(executed)S
5065(prior)S
4296 V
1080(to)S
1191(the)S
1347(matched)S
1721(rule's)S
1984(action.)S
2313(For)S
2486(example,)S
2885(it)S
2974(could)S
3230(be)S
3358(#de256ne'd)S
3771(to)S
3882(call)S
4061(a)S