📄 acd.1
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4501(and)S4674(can)S4842(be)S4965(used)S5177(as)S3696 V1080(null)S1261(commands.)S3864 V10 B1080(Acd)S10 R(will)157 1291 A1485(complain)S(about)223 1896 A2156(unexpected)S2651(indentation)S3140(shifts)S3395(and)S3577(empty)S(bodies.)287 3865 A4214(Commands)S4709(can)S4887(share)S5138(the)S3984 V1080(same)S(body)200 1328 A1569(by)S1710(placing)S2047(them)S2289(at)S2402(the)S2565(same)S2812(indentation)S3304(level)S3540(before)S3838(the)S4001(indented)S(body.)225 4387 A4677(They)S4924(are)S5088(then)S4104 V1080("guards")S1464(to)S1576(the)S1733(same)S(body,)225 1974 A2233(and)S2412(are)S2570(tried)S2789(one)S2968(by)S3102(one)S(until)184 3281 A3499(one)S(succeeds,)383 3678 A4095(after)S4315(which)S4595(the)S(body)200 4752 A4986(is)S5087(exe-)S4224 V1080(cuted.)S4392 V1080(Semicolons)S1577(may)S1778(be)S1901(used)S2113(to)S2219(separate)S2578(commands)S3041(instead)S3354(of)S3466(newlines.)S3902(The)S4087(commands)S4551(are)S4704(then)S4906(all)S5036(at)S5138(the)S4512 V1080(indentation)S1557(level)S1778(of)S1887(the)S2035(\256rst.)S4680 V870(E)S872(Ex)S936(xe)S988(ec)S1035(cu)S1082(ut)S1134(ti)S1164(io)S1194(on)S1246(n)S1323(p)S1325(ph)S1377(ha)S1429(as)S1476(se)S1517(es)S1564(s)S4800 V1080(The)S1279(driver)S1562(runs)S1777(in)S1897(three)S2141(phases:)S(Initialization,)540 2479 A3061(Argument)S3511(scanning,)S3935(and)S4122(Compilation.)S4716(Not)S4910(all)S5054(com-)S4920 V1080(mands)S1367(work)S1599(in)S1702(all)S1828(phases.)S2171(This)S2375(is)S2467(further)S2767(explained)S3183(below.)S5088 V870(T)S872(Th)S936(he)S988(e)S1060(C)S1062(Co)S1131(om)S1183(mm)S1263(ma)S1343(an)S1390(nd)S1442(ds)S1494(s)S5208 V1080(The)S1262(commands)S(accept)258 1722 A2005(arguments)S2449(that)S2625(are)S2774(usually)S3089(generic)S3412(expressions)S3907(that)S4084(implode)S4439(to)S4543(a)S4614(word)S4847(or)S4957(a)S5028(list)S5177(of)S5328 V1080(words.)S1407(When)S10 I1678(var)S10 R1843(is)S1941(speci\256ed,)S2355(then)S2559(a)S2635(single)S2906(word)S3144(or)S3259(subst)S3496(needs)S3756(to)S3865(be)S3991(given,)S4270(so)S4389(an)S4514(assignment)S4996(can)S5166(be)S5448 V1080(either)S10 I1335(name)S10 B1578(=)S10 I1660(value)S10 R1886(,)S1936(or)S10 B2045($)S10 I2095(name)S10 B2338(=)S10 I2420(value)S10 R2646(.)S5616 V10 I1080(var)S10 B1247(=)S10 I1329(expr)S(...)75 1533 A5736 V10 R1440(The)S1636(partially)S2011(evaluated)S2436(list)S2598(of)S2721(expressions)S3230(is)S3337(assigned)S3723(to)S10 I3841(var)S10 R3983(.)S4073(During)S4398(the)S4561(evaluation)S5020(is)S10 I5127(var)S5856 V10 R1440(marked)S1767(as)S1876(local,)S2122(and)S2292(after)S2503(the)S2651(assignment)S3128(set)S3265(from)S(unde\256ned)396 3486 A3907(to)S4010(de\256ned.)S6024 V10 B1080(unset)S10 I1335(var)S6144 V1440(Var)S10 R1616(is)S1708(set)S1845(to)S1948(null)S2129(and)S2299(is)S2391(marked)S2718(as)S(unde\256ned.)421 2827 A6312 V10 B1080(import)S10 I1402(var)S6432 V10 R1440(If)S10 I1540(var)S10 R1706(is)S1805(de\256ned)S2133(in)S2243(the)S2398(environment)S2938(of)S10 B3054(acd)S10 R3237(then)S3442(it)S3530(is)S3629(assigned)S4007(to)S10 I4117(var)S10 R4259(.)S4341(The)S4530(environment)S5070(vari-)S6552 V1440(able)S1648(is)S(split)173 1755 A1968(into)S2164(words)S2449(at)S(whitespace)448 2561 A3048(and)S3232(colons.)S3583(Empty)S(space)224 3890 A4153(between)S4528(two)S4718(colons)S5019(\()S10 B5053(::)S10 R5121(\))S5194(is)S6672 V1440(changed)S1800(to)S1903(a)S1973(dot.)S6840 V10 B1080(mktemp)S10 I1464(var)S10 B1631([)S10 I(suffix)218 1665 A10 B1891(])S6960 V10 R1440(Assigns)S1790(to)S10 I1900(var)S10 R2066(the)S2221(name)S2471(of)S2587(a)S2665(new)S2866(temporary)S3313(\256le,)S3500(usually)S3823(something)S4274(like)S(/tmp/acd12345x.)677 4458 A5193(If)S7080 V10 I1440(suf\256x)S10 R1682(is)S1779(present)S2100(then)S2303(it)S(will)157 2389 A2576(be)S2700(added)S2969(to)S3076(the)S3228(temporary)S3671(\256le's)S3902(name.)S4199(\(Use)S4419(it)S(because)319 4504 A4852(some)S5093(pro-)S7200 V1440(grams)S1715(require)S2030(it,)S2140(or)S2253(just)S(because)319 2427 A2775(it)S(looks)217 2860 A(good.\))259 3106 A10 B3419(Acd)S10 R3622(remembers)S4099(this)S4274(\256le,)S4458(and)S(will)157 4633 A4820(delete)S5091(it)S5177(as)S7320 V(soon)189 1440 A1654(as)S(you)150 1763 A1938(stop)S2130(referencing)S2615(it.)S7903 V720(Page)S941(3)S4455(September)S4911(13,)S(1996)200 5061 A8143 VEP%%Page: 4 4BP/slant 0 def/height 0 def480 V10 R720(ACD)S941(\()S983(1)S1041(\))S2696(Eighth)S(Edition)296 2989 A4906(ACD)S5127(\()S5169(1)S5227(\))S960 V10 B1080(temporary)S10 I1564(word)S1080 V10 R1440(Mark)S1695(the)S1855(\256le)S2021(named)S2326(by)S10 I2463(word)S10 R2706(as)S2827(a)S2909(temporary)S3360(\256le.)S3576(You)S3786(have)S4013(to)S4128(make)S4383(sure)S4588(that)S4777(the)S4938(name)S5194(is)S1200 V1440(stored)S1713(in)S1818(some)S2057(list)S2207(in)S2312(imploded)S2718(form,)S2966(and)S3138(not)S3293(just)S3465(temporarily)S3962(created)S4281(when)S10 I4525(word)S10 R4757(is)S4850(evaluated,)S1320 V(because)319 1440 A1784(then)S1982(it)S(will)157 2063 A2245(be)S2365(immediately)S2893(removed)S3270(and)S3440(forgotten.)S1488 V10 B1080(stop)S10 I(suffix)218 1284 A1608 V10 R1440(Sets)S1637(the)S1789(target)S2048(suf\256x)S2306(for)S2453(the)S2605(compilation)S3114(phase.)S3422(Something)S3886(like)S10 B4066(stop)S4274(.o)S10 R4378(means)S4664(that)S4845(the)S4998(source)S1728 V1440(\256les)S1634(must)S1855(be)S1976(compiled)S2376(to)S2480(object)S2752(\256les.)S2996(At)S3123(least)S3334(one)S10 B3505(stop)S10 R3710(command)S4132(must)S4352(be)S4472(executed)S4855(before)S5138(the)S1848 V1440(compilation)S1948(phase)S2205(begins.)S2545(It)S2635(may)S2836(not)S2992(be)S3115(changed)S3478(during)S3769(the)S3921(compilation)S4430(phase.)S4738(\(Note:)S5025(There)S1968 V1440(is)S1532(no)S1657(restriction)S2091(on)S10 I2216(suf\256x)S10 R2436(,)S2486(it)S2567(need)S2782(not)S2935(start)S3134(with)S3338(a)S3408(dot.\))S2136 V10 B1080(treat)S10 I(file)129 1313 A(suffix)218 1467 A2256 V10 R1440(Marks)S1723(the)S1872(\256le)S2027(as)S2137(having)S2436(the)S2585(given)S2834(suf\256x)S3089(for)S3234(the)S3384(compile)S3735(phase.)S4041(Useful)S4337(for)S4482(sending)S4821(a)S10 B-14893(-)S10 B4950(l)S10 R5005(option)S2376 V1440(directly)S1773(to)S1876(the)S2024(loader)S2301(by)S2426(treating)S2759(it)S2840(as)S2949(having)S3247(the)S10 B3395(.a)S10 R3495(suf\256x.)S2544 V10 B1080(numeric)S10 I1464(arg)S2664 V10 R1440(Checks)S1761(if)S10 I1848(arg)S10 R2012(is)S2104(a)S2174(number.)S2556(If)S2649(not)S2802(then)S10 B3000(acd)S10 R(will)157 3176 A3358(exit)S3534(with)S3738(a)S3808(nice)S4001(error)S4223(message.)S2832 V10 B(error)230 1080 A10 I1335(expr)S(...)75 1539 A2952 V10 R1440(Makes)S1733(the)S1881(driver)S2147(print)S2362(the)S2510(error)S2732(message)S10 I3098(expr)S(...)75 3302 A10 R3402(and)S3572(exit.)S3120 V10 B1080(if)S10 I1167(expr)S10 B1379(=)S10 I1461(expr)S3240 V10 B1440(If)S10 R1540(tests)S1746(if)S1835(the)S1985(two)S2163(expressions)S2660(are)S2812(equal)S3058(using)S3303(set)S3443(comparison,)S3965(i.e.)S(each)185 4116 A4329(expression)S(should)267 4787 A5082(con-)S3360 V1440(tain)S1616(all)S1742(the)S1890(words)S2161(in)S2264(the)S2412(other)S2644(expression.)S3149(If)S3242(the)S3390(test)S(succeeds)358 3555 A3938(then)S4136(the)S(if-body)296 4284 A4605(is)S4697(executed.)S3528 V10 B1080(ifdef)S10 I1302(var)S3648 V10 R1440(Executes)S1829(the)S(ifdef-body)425 1977 A2427(if)S10 I2514(var)S10 R2673(is)S2765(de\256ned.)S3816 V10 B1080(ifndef)S10 I1358(var)S3936 V10 R1440(Executes)S1829(the)S(ifndef-body)475 1977 A2477(if)S10 I2564(var)S10 R2723(is)S(unde\256ned.)421 2815 A4104 V10 B1080(iftemp)S10 I1386(arg)S4224 V10 R1440(Executes)S1831(the)S(iftemp-body)497 1981 A2505(if)S10 I2594(arg)S10 R2760(is)S2854(a)S2926(temporary)S3367(\256le.)S3573(Use)S3757(it)S3841(when)S4087(a)S4160(command)S4584(has)S4746(the)S4897(same)S5132(\256le)S4344 V1440(as)S(input)206 1549 A1780(and)S1950(output)S2231(and)S(you)150 2401 A(don't)212 2576 A2813(want)S3034(to)S(clobber)302 3137 A3464(the)S3612(source)S3900(\256le:)S4512 V10 B1440(transform)S1902(.o)S2002(.o)S4632 V1800(iftemp)S2106($)S10 Y2156(*)S2158(*)S4752 V10 B2160($>)S2292(=)S2374($)S10 Y2424(*)S2426(*)S4872 V10 B1800(else)S4992 V2160(cp)S2286($)S10 Y2336(*)S2338(*)S10 B2413($>)S5112 V1800(optimize)S2195($>)S5280 V1080(ifhash)S10 I1368(arg)S5400 V10 R1440(Executes)S1836(the)S(ifhash-body)480 1991 A2504(if)S10 I2599(arg)S10 R2771(is)S2871(an)S2999(existing)S3350(\256le)S3512(with)S3724(a)S3802(')S10 B3836(#)S10 R3886(')S3953(as)S4070(the)S4226(very)S4438(\256rst)S4628(character.)S5082(This)S5520 V1440(usually)S1755(indicates)S2138(that)S2314(the)S2462(\256le)S2616(must)S2836(be)S2956(pre-processed:)S5688 V10 B1440(transform)S1902(.s)S1991(.o)S5808 V1800(ifhash)S2088($)S10 Y2138(*)S2140(*)S5928 V10 B2160(mktemp)S2544(ASM)S2793(.s)S6048 V2160($CPP)S2432($)S10 Y2482(*)S2484(*)S10 B2559(>)S2641($ASM)S6168 V1800(else)S6288 V2160(ASM)S2409(=)S2491($)S10 Y2541(*)S2543(*)S6408 V10 B1800($AS)S10 B-12004(-)S10 B2061(o)S2136($>)S2268($ASM)S6528 V1800(unset)S2055(ASM)S6696 V1080(else)S10 R1440(Executes)S1834(the)S(else-body)391 1987 A2408(if)S2500(the)S2653(last)S2823(executed)S10 B3211(if)S10 R3273(,)S10 B3329(ifdef)S10 R3526(,)S10 B3582(ifndef)S10 R3835(,)S10 B3891(iftemp)S10 R4172(,)S4228(or)S10 B4343(ifhash)S10 R4637(was)S(unsuccess-)436 4825 A6816 V1440(ful.)S1632(Note)S1858(that)S10 B2039(else)S10 R2226(need)S2446(not)S2604(immediately)S3137(follow)S3430(an)S3555(if,)S3672(but)S(you)150 3830 A4010(are)S4164(advised)S4501(not)S4659(to)S4767(make)S5014(use)S5177(of)S6936 V1440(this.)S1660(It)S1747(is)S1839(a)S1909("feature")S2297(that)S2473(may)S2671(not)S2824(last.)S7104 V10 B1080(apply)S10 I(suffix1)268 1345 A(suffix2)268 1638 A7224 V10 R1440(Executed)S1869(inside)S2163(a)S2262(transform)S2708(rule)S(body)200 2919 A3173(to)S3305(transform)S3751(the)S(input)206 3929 A4190(\256le)S(according)397 4374 A4826(to)S4959(another)S7344 V1440(transform)S1861(rule)S2047(that)S2227(has)S2390(the)S2542(given)S(input)206 2794 A3029(and)S3203(output)S3488(suf\256xes.)S3880(The)S4066(\256le)S(under)229 4224 A10 B4481($)S10 Y4531(*)S4533(*)S10 R(will)157 4611 A4796(be)S(replaced)342 4919 A7464 V1440(by)S1579(the)S1741(new)S1948(\256le.)S2166(So)S2311(if)S2413(there)S2655(is)S2762(a)S10 B2847(.c)S2957(.i)S10 R3050(preprocessor)S3605(rule)S3802(then)S4015(the)S4178(example)S4559(of)S10 B4683(ifhash)S10 R4986(can)S5166(be)S7903 V720(September)S1176(13,)S(1996)200 1326 A4990(Page)S5211(4)S8143 VEP%%Page: 5 5BP/slant 0 def/height 0 def480 V10 R720(ACD)S941(\()S983(1)S1041(\))S2696(Eighth)S(Edition)296 2989 A4906(ACD)S5127(\()S5169(1)S5227(\))S960 V(replaced)342 1440 A1807(by:)S1128 V10 B1440(transform)S1902(.s)S1991(.o)S1248 V1800(ifhash)S2088($)S10 Y2138(*)S2140(*)S1368 V10 B2160(apply)S2425(.c)S2520(.i)S1488 V1800($AS)S10 B-12004(-)S10 B2061(o)S2136($>)S2268($*)S1656 V1080(include)S10 I1419(descr)S1776 V10 R1440(Reads)S1717(another)S2050(description)S2528(\256le)S2688(and)S(replaces)331 2864 A3226(the)S10 B3380(include)S10 R3725(with)S3935(it.)S4072(Execution)S4511(continues)S4927(with)S5138(the)S1896 V1440(\256rst)S1628(list)S1782(in)S1891(the)S2045(new)S2244(program.)S2666(The)S2854(search)S⌨️ 快捷键说明
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