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1 | =head1 NAME |
2 | |
3 | perltodo - Perl TO-DO List |
4 | |
5 | =head1 DESCRIPTION |
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6 | |
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7 | This is a list of wishes for Perl. Send updates to |
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8 | I<perl5-porters@perl.org>. If you want to work on any of these |
9 | projects, be sure to check the perl5-porters archives for past ideas, |
10 | flames, and propaganda. This will save you time and also prevent you |
11 | from implementing something that Larry has already vetoed. One set |
12 | of archives may be found at: |
13 | |
14 | http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/ |
15 | |
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16 | =head1 To do during 5.6.x |
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17 | |
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18 | =head2 Support for I/O disciplines |
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19 | |
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20 | C<perlio> provides this, but the interface could be a lot more |
21 | straightforward. |
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22 | |
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23 | =head2 Autoload bytes.pm |
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24 | |
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25 | When the lexer sees, for instance, C<bytes::length>, it should |
26 | automatically load the C<bytes> pragma. |
27 | |
28 | =head2 Make "\u{XXXX}" et al work |
29 | |
30 | Danger, Will Robinson! Discussing the semantics of C<"\x{F00}">, |
31 | C<"\xF00"> and C<"\U{F00}"> on P5P I<will> lead to a long and boring |
32 | flamewar. |
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33 | |
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34 | =head2 Create a char *sv_pvprintify(sv, STRLEN *lenp, UV flags) |
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35 | |
36 | For displaying PVs with control characters, embedded nulls, and Unicode. |
37 | This would be useful for printing warnings, or data and regex dumping, |
38 | not_a_number(), and so on. |
39 | |
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40 | Requirements: should handle both byte and UTF8 strings. isPRINT() |
41 | characters printed as-is, character less than 256 as \xHH, Unicode |
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42 | characters as \x{HHH}. Don't assume ASCII-like, either, get somebody |
43 | on EBCDIC to test the output. |
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44 | |
45 | Possible options, controlled by the flags: |
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46 | - whitespace (other than ' ' of isPRINT()) printed as-is |
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47 | - use isPRINT_LC() instead of isPRINT() |
48 | - print control characters like this: "\cA" |
49 | - print control characters like this: "^A" |
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50 | - non-PRINTables printed as '.' instead of \xHH |
51 | - use \OOO instead of \xHH |
52 | - use the C/Perl-metacharacters like \n, \t |
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53 | - have a maximum length for the produced string (read it from *lenp) |
54 | - append a "..." to the produced string if the maximum length is exceeded |
0661e9a4 |
55 | - really fancy: print unicode characters as \N{...} |
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56 | |
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57 | NOTE: pv_display(), pv_uni_display(), sv_uni_display() are already |
58 | doing something like the above. |
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59 | |
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60 | =head2 Overloadable regex assertions |
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61 | |
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62 | This may or may not be possible with the current regular expression |
63 | engine. The idea is that, for instance, C<\b> needs to be |
64 | algorithmically computed if you're dealing with Thai text. Hence, the |
65 | B<\b> assertion wants to be overloaded by a function. |
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66 | |
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67 | =head2 Unicode |
68 | |
69 | =over 4 |
70 | |
71 | =item * |
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72 | |
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73 | Allow for long form of the General Category Properties, e.g |
74 | C<\p{IsOpenPunctuation}>, not just the abbreviated form, e.g. |
75 | C<\p{IsPs}>. |
76 | |
77 | =item * |
78 | |
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79 | Allow for the metaproperties: C<XID Start>, C<XID Continue>, |
80 | C<NF*_NO>, C<NF*_MAYBE> (require the DerivedCoreProperties and |
81 | DerviceNormalizationProperties files). |
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82 | |
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83 | There are also multiple value properties still unimplemented: |
84 | C<Numeric Type>, C<East Asian Width>. |
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85 | |
86 | =item * |
87 | |
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88 | Case Mappings? http://www.unicode.org/unicode/reports/tr21/ |
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89 | |
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90 | Mostly implemented (all of 1:1, 1:N, N:1), only the "final sigma" |
91 | and locale-specific rules of SpecCase are not implemented. |
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92 | |
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93 | =item * |
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94 | |
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95 | UTF-8 identifier names should probably be canonicalized: NFC? |
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96 | |
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97 | =item * |
98 | |
99 | UTF-8 in package names and sub names? The first is problematic |
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100 | because of the mapping to pathnames, ditto for the second one if |
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101 | one does autosplitting, for example. |
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102 | |
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103 | =back |
104 | |
105 | See L<perlunicode/UNICODE REGULAR EXPRESSION SUPPORT LEVEL> for what's |
f34dec15 |
106 | there and what's missing. Almost all of Levels 2 and 3 is missing, |
107 | and as of 5.8.0 not even all of Level 1 is there. |
8d3e8850 |
108 | They have some tricks Perl doesn't yet implement, such as character |
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109 | class subtraction. |
110 | |
111 | http://www.unicode.org/unicode/reports/tr18/ |
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112 | |
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113 | =head2 Work out exit/die semantics for threads |
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114 | |
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115 | There are some suggestions to use for example something like this: |
116 | default to "(thread exiting first will) wait for the other threads |
117 | until up to 60 seconds". Other possibilities: |
118 | |
119 | use threads wait => 0; |
120 | |
121 | Do not wait. |
122 | |
123 | use threads wait_for => 10; |
124 | |
125 | Wait up to 10 seconds. |
126 | |
127 | use threads wait_for => -1; |
128 | |
129 | Wait for ever. |
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130 | |
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131 | http://archive.develooper.com/perl5-porters@perl.org/msg79618.html |
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132 | |
b2f9d798 |
133 | =head2 Better support for nonpreemptive threading systems like GNU pth |
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134 | |
b2f9d798 |
135 | To better support nonpreemptive threading systems, perhaps some of the |
136 | blocking functions internally in Perl should do a yield() before a |
137 | blocking call. (Now certain threads tests ({basic,list,thread.t}) |
138 | simply do a yield() before they sleep() to give nonpreemptive thread |
139 | implementations a chance). |
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140 | |
b2f9d798 |
141 | In some cases, like the GNU pth, which has replacement functions that |
142 | are nonblocking (pth_select instead of select), maybe Perl should be |
143 | using them instead when built for threading. |
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144 | |
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145 | =head2 Typed lexicals for compiler |
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146 | |
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147 | =head2 Compiler workarounds for Win32 |
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148 | |
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149 | =head2 AUTOLOADing in the compiler |
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150 | |
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151 | =head2 Fixing comppadlist when compiling |
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152 | |
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153 | =head2 Cleaning up exported namespace |
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154 | |
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155 | =head2 Complete signal handling |
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156 | |
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157 | Add C<PERL_ASYNC_CHECK> to opcodes which loop; replace C<sigsetjmp> with |
158 | C<sigjmp>; check C<wait> for signal safety. |
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159 | |
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160 | =head2 Out-of-source builds |
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161 | |
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162 | This was done for 5.6.0, but needs reworking for 5.7.x |
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163 | |
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164 | =head2 POSIX realtime support |
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165 | |
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166 | POSIX 1003.1 1996 Edition support--realtime stuff: POSIX semaphores, |
167 | message queues, shared memory, realtime clocks, timers, signals (the |
168 | metaconfig units mostly already exist for these) |
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169 | |
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170 | =head2 UNIX98 support |
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171 | |
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172 | Reader-writer locks, realtime/asynchronous IO |
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173 | |
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174 | =head2 IPv6 Support |
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175 | |
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176 | There are non-core modules, such as C<Socket6>, but these will need |
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177 | integrating when IPv6 actually starts to really happen. See RFC 2292 |
178 | and RFC 2553. |
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179 | |
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180 | =head2 Long double conversion |
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181 | |
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182 | Floating point formatting is still causing some weird test failures. |
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183 | |
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184 | =head2 Locales |
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185 | |
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186 | Locales and Unicode interact with each other in unpleasant ways. |
187 | One possible solution would be to adopt/support ICU: |
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188 | |
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189 | http://oss.software.ibm.com/developerworks/opensource/icu/project/ |
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190 | |
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191 | =head2 Arithmetic on non-Arabic numerals |
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192 | |
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193 | C<[1234567890]> aren't the only numerals any more. |
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194 | |
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195 | =head2 POSIX Unicode character classes |
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196 | |
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197 | (C<[=a=]> for equivalence classes, C<[.ch.]> for collation.) |
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198 | These are dependent on Unicode normalization and collation. |
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199 | |
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200 | =head2 Factoring out common suffices/prefices in regexps (trie optimization) |
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201 | |
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202 | Currently, the user has to optimize C<foo|far> and C<foo|goo> into |
203 | C<f(?:oo|ar)> and C<[fg]oo> by hand; this could be done automatically. |
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204 | |
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205 | =head2 Security audit shipped utilities |
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206 | |
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207 | All the code we ship with Perl needs to be sensible about temporary file |
208 | handling, locking, input validation, and so on. |
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209 | |
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210 | =head2 Sort out the uid-setting mess |
211 | |
212 | Currently there are several problems with the setting of uids ($<, $> |
213 | for the real and effective uids). Firstly, what exactly setuid() call |
214 | gets invoked in which platform is simply a big mess that needs to be |
215 | untangled. Secondly, the effects are apparently not standard across |
216 | platforms, (if you first set $< and then $>, or vice versa, being |
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217 | uid == euid == zero, or just euid == zero, or as a normal user, what are |
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218 | the results?). The test suite not (usually) being run as root means |
219 | that these things do not get much testing. Thirdly, there's quite |
220 | often a third uid called saved uid, and Perl has no knowledge of that |
221 | feature in any way. (If one has the saved uid of zero, one can get |
222 | back any real and effective uids.) As an example, to change also the |
223 | saved uid, one needs to set the real and effective uids B<twice>-- in |
224 | most systems, that is: in HP-UX that doesn't seem to work. |
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225 | |
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226 | =head2 Custom opcodes |
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227 | |
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228 | Have a way to introduce user-defined opcodes without the subroutine call |
229 | overhead of an XSUB; the user should be able to create PP code. Simon |
230 | Cozens has some ideas on this. |
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231 | |
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232 | =head2 DLL Versioning |
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233 | |
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234 | Windows needs a way to know what version of an XS or C<libperl> DLL it's |
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235 | loading. |
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236 | |
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237 | =head2 Introduce @( and @) |
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238 | |
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239 | C<$(> may return "foo bar baz". Unfortunately, since groups can |
240 | theoretically have spaces in their names, this could be one, two or |
241 | three groups. |
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242 | |
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243 | =head2 Floating point handling |
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244 | |
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245 | C<NaN> and C<inf> support is particularly troublesome. |
246 | (fp_classify(), fp_class(), fp_class_d(), class(), isinf(), |
247 | isfinite(), finite(), isnormal(), unordered(), <ieeefp.h>, |
248 | <fp_class.h> (there are metaconfig units for all these) (I think), |
249 | fp_setmask(), fp_getmask(), fp_setround(), fp_getround() |
250 | (no metaconfig units yet for these). Don't forget finitel(), fp_classl(), |
251 | fp_class_l(), (yes, both do, unfortunately, exist), and unorderedl().) |
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252 | |
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253 | As of Perl 5.6.1, there is a Perl macro, Perl_isnan(). |
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254 | |
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255 | =head2 IV/UV preservation |
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256 | |
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257 | Nicholas Clark has done a lot of work on this, but work is continuing. |
258 | C<+>, C<-> and C<*> work, but guards need to be in place for C<%>, C</>, |
259 | C<&>, C<oct>, C<hex> and C<pack>. |
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260 | |
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261 | =head2 Replace pod2html with something using Pod::Parser |
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262 | |
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263 | The CPAN module C<Marek::Pod::Html> may be a more suitable basis for a |
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264 | C<pod2html> converter; the current one duplicates the functionality |
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265 | abstracted in C<Pod::Parser>, which makes updating the POD language |
266 | difficult. |
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267 | |
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268 | =head2 Automate module testing on CPAN |
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269 | |
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270 | When a new Perl is being beta tested, porters have to manually grab |
271 | their favourite CPAN modules and test them - this should be done |
272 | automatically. |
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273 | |
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274 | =head2 sendmsg and recvmsg |
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275 | |
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276 | We have all the other BSD socket functions but these. There are |
277 | metaconfig units for these functions which can be added. To avoid these |
278 | being new opcodes, a solution similar to the way C<sockatmark> was added |
279 | would be preferable. (Autoload the C<IO::whatever> module.) |
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280 | |
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281 | =head2 Rewrite perlre documentation |
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282 | |
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283 | The new-style patterns need full documentation, and the whole document |
284 | needs to be a lot clearer. |
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285 | |
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286 | =head2 Convert example code to IO::Handle filehandles |
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287 | |
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288 | =head2 Document Win32 choices |
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289 | |
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290 | =head2 Check new modules |
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291 | |
722d2a37 |
292 | =head2 Make roffitall find pods and libs itself |
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293 | |
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294 | Simon Cozens has done some work on this but it needs a rethink. |
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295 | |
722d2a37 |
296 | =head1 To do at some point |
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297 | |
722d2a37 |
298 | These are ideas that have been regularly tossed around, that most |
299 | people believe should be done maybe during 5.8.x |
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300 | |
722d2a37 |
301 | =head2 Remove regular expression recursion |
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302 | |
722d2a37 |
303 | Because the regular expression engine is recursive, badly designed |
304 | expressions can lead to lots of recursion filling up the stack. Ilya |
305 | claims that it is easy to convert the engine to being iterative, but |
306 | this has still not yet been done. There may be a regular expression |
307 | engine hit squad meeting at TPC5. |
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308 | |
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309 | =head2 Memory leaks after failed eval |
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310 | |
722d2a37 |
311 | Perl will leak memory if you C<eval "hlagh hlagh hlagh hlagh">. This is |
312 | partially because it attempts to build up an op tree for that code and |
313 | doesn't properly free it. The same goes for non-syntactically-correct |
314 | regular expressions. Hugo looked into this, but decided it needed a |
315 | mark-and-sweep GC implementation. |
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316 | |
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317 | Alan notes that: The basic idea was to extend the parser token stack |
318 | (C<YYSTYPE>) to include a type field so we knew what sort of thing each |
210b36aa |
319 | element of the stack was. The F<perly.c> code would then have to be |
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320 | postprocessed to record the type of each entry on the stack as it was |
321 | created, and the parser patched so that it could unroll the stack |
322 | properly on error. |
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323 | |
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324 | This is possible to do, but would be pretty messy to implement, as it |
325 | would rely on even more sed hackery in F<perly.fixer>. |
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326 | |
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327 | =head2 bitfields in pack |
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328 | |
722d2a37 |
329 | =head2 Cross compilation |
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330 | |
722d2a37 |
331 | Make Perl buildable with a cross-compiler. This will play havoc with |
da75cd15 |
332 | Configure, which needs to know how the target system will respond to |
722d2a37 |
333 | its tests; maybe C<microperl> will be a good starting point here. |
334 | (Indeed, Bart Schuller reports that he compiled up C<microperl> for |
335 | the Agenda PDA and it works fine.) A really big spanner in the works |
336 | is the bootstrapping build process of Perl: if the filesystem the |
337 | target systems sees is not the same what the build host sees, various |
338 | input, output, and (Perl) library files need to be copied back and forth. |
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339 | |
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340 | As of 5.8.0 Configure mostly works for cross-compilation |
341 | (used successfully for iPAQ Linux), miniperl gets built, |
342 | but then building DynaLoader (and other extensions) fails |
343 | since MakeMaker knows nothing of cross-compilation. |
344 | (See INSTALL/Cross-compilation for the state of things.) |
345 | |
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346 | =head2 Perl preprocessor / macros |
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347 | |
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348 | Source filters help with this, but do not get us all the way. For |
349 | instance, it should be possible to implement the C<??> operator somehow; |
350 | source filters don't (quite) cut it. |
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351 | |
722d2a37 |
352 | =head2 Perl lexer in Perl |
a45bd81d |
353 | |
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354 | Damian Conway is planning to work on this, but it hasn't happened yet. |
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355 | |
722d2a37 |
356 | =head2 Using POSIX calls internally |
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357 | |
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358 | When faced with a BSD vs. SysV -style interface to some library or |
722d2a37 |
359 | system function, perl's roots show in that it typically prefers the BSD |
360 | interface (but falls back to the SysV one). One example is getpgrp(). |
361 | Other examples include C<memcpy> vs. C<bcopy>. There are others, mostly in |
210b36aa |
362 | F<pp_sys.c>. |
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363 | |
722d2a37 |
364 | Mostly, this item is a suggestion for which way to start a journey into |
365 | an C<#ifdef> forest. It is not primarily a suggestion to eliminate any of |
366 | the C<#ifdef> forests. |
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367 | |
722d2a37 |
368 | POSIX calls are perhaps more likely to be portable to unexpected |
369 | architectures. They are also perhaps more likely to be actively |
370 | maintained by a current vendor. They are also perhaps more likely to be |
371 | available in thread-safe versions, if appropriate. |
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372 | |
722d2a37 |
373 | =head2 -i rename file when changed |
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374 | |
722d2a37 |
375 | It's only necessary to rename a file when inplace editing when the file |
376 | has changed. Detecting a change is perhaps the difficult bit. |
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377 | |
722d2a37 |
378 | =head2 All ARGV input should act like E<lt>E<gt> |
e50bb9a1 |
379 | |
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380 | eg C<read(ARGV, ...)> doesn't currently read across multiple files. |
381 | |
722d2a37 |
382 | =head2 Support for rerunning debugger |
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383 | |
722d2a37 |
384 | There should be a way of restarting the debugger on demand. |
e50bb9a1 |
385 | |
c6287c21 |
386 | =head2 Test Suite for the Debugger |
387 | |
388 | The debugger is a complex piece of software and fixing something |
389 | here may inadvertently break something else over there. To tame |
390 | this chaotic behaviour, a test suite is necessary. |
391 | |
722d2a37 |
392 | =head2 my sub foo { } |
c47ff5f1 |
393 | |
722d2a37 |
394 | The basic principle is sound, but there are problems with the semantics |
395 | of self-referential and mutually referential lexical subs: how to |
396 | declare the subs? |
c47ff5f1 |
397 | |
722d2a37 |
398 | =head2 One-pass global destruction |
c47ff5f1 |
399 | |
722d2a37 |
400 | Sweeping away all the allocated memory in one go is a laudable goal, but |
401 | it's difficult and in most cases, it's easier to let the memory get |
402 | freed by exiting. |
e50bb9a1 |
403 | |
722d2a37 |
404 | =head2 Rewrite regexp parser |
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405 | |
722d2a37 |
406 | There has been talk recently of rewriting the regular expression parser |
407 | to produce an optree instead of a chain of opcodes; it's unclear whether |
408 | or not this would be a win. |
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409 | |
722d2a37 |
410 | =head2 Cache recently used regexps |
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411 | |
722d2a37 |
412 | This is to speed up |
e50bb9a1 |
413 | |
722d2a37 |
414 | for my $re (@regexps) { |
415 | $matched++ if /$re/ |
416 | } |
e50bb9a1 |
417 | |
722d2a37 |
418 | C<qr//> already gives us a way of saving compiled regexps, but it should |
419 | be done automatically. |
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420 | |
722d2a37 |
421 | =head2 Cross-compilation support |
04c70446 |
422 | |
722d2a37 |
423 | Bart Schuller reports that using C<microperl> and a cross-compiler, he |
424 | got Perl working on the Agenda PDA. However, one cannot build a full |
425 | Perl because Configure needs to get the results for the target platform, |
426 | for the host. |
e50bb9a1 |
427 | |
722d2a37 |
428 | =head2 Bit-shifting bitvectors |
e50bb9a1 |
429 | |
722d2a37 |
430 | Given: |
e50bb9a1 |
431 | |
722d2a37 |
432 | vec($v, 1000, 1) = 1; |
e50bb9a1 |
433 | |
722d2a37 |
434 | One should be able to do |
e50bb9a1 |
435 | |
722d2a37 |
436 | $v <<= 1; |
e50bb9a1 |
437 | |
722d2a37 |
438 | and have the 999'th bit set. |
e50bb9a1 |
439 | |
722d2a37 |
440 | Currently if you try with shift bitvectors you shift the NV/UV, instead |
441 | of the bits in the PV. Not very logical. |
e50bb9a1 |
442 | |
722d2a37 |
443 | =head2 debugger pragma |
e50bb9a1 |
444 | |
722d2a37 |
445 | The debugger is implemented in Perl in F<perl5db.pl>; turning it into a |
446 | pragma should be easy, but making it work lexically might be more |
447 | difficult. Fiddling with C<$^P> would be necessary. |
e50bb9a1 |
448 | |
722d2a37 |
449 | =head2 use less pragma |
e50bb9a1 |
450 | |
722d2a37 |
451 | Identify areas where speed/memory tradeoffs can be made and have a hint |
452 | to switch between them. |
e50bb9a1 |
453 | |
722d2a37 |
454 | =head2 switch structures |
e50bb9a1 |
455 | |
722d2a37 |
456 | Although we have C<Switch.pm> in core, Larry points to the dormant |
457 | C<nswitch> and C<cswitch> ops in F<pp.c>; using these opcodes would be |
458 | much faster. |
e50bb9a1 |
459 | |
722d2a37 |
460 | =head2 Cache eval tree |
e50bb9a1 |
461 | |
722d2a37 |
462 | =head2 rcatmaybe |
e50bb9a1 |
463 | |
722d2a37 |
464 | =head2 Shrink opcode tables |
e50bb9a1 |
465 | |
722d2a37 |
466 | =head2 Optimize away @_ |
e50bb9a1 |
467 | |
722d2a37 |
468 | Look at the "reification" code in C<av.c> |
e50bb9a1 |
469 | |
722d2a37 |
470 | =head2 Prototypes versus indirect objects |
e50bb9a1 |
471 | |
722d2a37 |
472 | Currently, indirect object syntax bypasses prototype checks. |
e50bb9a1 |
473 | |
210b36aa |
474 | =head2 Install HTML |
e50bb9a1 |
475 | |
722d2a37 |
476 | HTML versions of the documentation need to be installed by default; a |
477 | call to C<installhtml> from C<installperl> may be all that's necessary. |
e50bb9a1 |
478 | |
722d2a37 |
479 | =head2 Prototype method calls |
e50bb9a1 |
480 | |
722d2a37 |
481 | =head2 Return context prototype declarations |
e50bb9a1 |
482 | |
722d2a37 |
483 | =head2 magic_setisa |
e50bb9a1 |
484 | |
722d2a37 |
485 | =head2 Garbage collection |
e50bb9a1 |
486 | |
722d2a37 |
487 | There have been persistent mumblings about putting a mark-and-sweep |
488 | garbage detector into Perl; Alan Burlison has some ideas about this. |
e50bb9a1 |
489 | |
722d2a37 |
490 | =head2 IO tutorial |
e50bb9a1 |
491 | |
722d2a37 |
492 | Mark-Jason Dominus has the beginnings of one of these. |
e50bb9a1 |
493 | |
722d2a37 |
494 | =head2 Rewrite perldoc |
e50bb9a1 |
495 | |
722d2a37 |
496 | There are a few suggestions for what to do with C<perldoc>: maybe a |
497 | full-text search, an index function, locating pages on a particular |
498 | high-level subject, and so on. |
e50bb9a1 |
499 | |
3958b146 |
500 | =head2 Install .3p manpages |
e50bb9a1 |
501 | |
3958b146 |
502 | This is a bone of contention; we can create C<.3p> manpages for each |
722d2a37 |
503 | built-in function, but should we install them by default? Tcl does this, |
504 | and it clutters up C<apropos>. |
e50bb9a1 |
505 | |
722d2a37 |
506 | =head2 Unicode tutorial |
e50bb9a1 |
507 | |
722d2a37 |
508 | Simon Cozens promises to do this before he gets old. |
e50bb9a1 |
509 | |
722d2a37 |
510 | =head2 Update POSIX.pm for 1003.1-2 |
3958b146 |
511 | |
722d2a37 |
512 | =head2 Retargetable installation |
e50bb9a1 |
513 | |
722d2a37 |
514 | Allow C<@INC> to be changed after Perl is built. |
e50bb9a1 |
515 | |
722d2a37 |
516 | =head2 POSIX emulation on non-POSIX systems |
e50bb9a1 |
517 | |
722d2a37 |
518 | Make C<POSIX.pm> behave as POSIXly as possible everywhere, meaning we |
519 | have to implement POSIX equivalents for some functions if necessary. |
e50bb9a1 |
520 | |
722d2a37 |
521 | =head2 Rename Win32 headers |
e50bb9a1 |
522 | |
722d2a37 |
523 | =head2 Finish off lvalue functions |
524 | |
525 | They don't work in the debugger, and they don't work for list or hash |
526 | slices. |
e50bb9a1 |
527 | |
722d2a37 |
528 | =head2 Update sprintf documentation |
e50bb9a1 |
529 | |
722d2a37 |
530 | Hugo van der Sanden plans to look at this. |
e50bb9a1 |
531 | |
722d2a37 |
532 | =head2 Use fchown/fchmod internally |
e50bb9a1 |
533 | |
722d2a37 |
534 | This has been done in places, but needs a thorough code review. |
535 | Also fchdir is available in some platforms. |
e50bb9a1 |
536 | |
d45541b3 |
537 | =head2 Make v-strings overloaded objects |
c5fc23ff |
538 | |
d45541b3 |
539 | Instead of having to guess whether a string is a v-string and thus |
540 | needs to be displayed with %vd, make v-strings (readonly) objects |
541 | (class "vstring"?) with a stringify overload. |
c5fc23ff |
542 | |
49293501 |
543 | =head2 Allow restricted hash assignment |
544 | |
545 | Currently you're not allowed to assign to a restricted hash at all, |
546 | even with the same keys. |
547 | |
548 | %restricted = (foo => 42); # error |
549 | |
550 | This should be allowed if the new keyset is a subset of the old |
551 | keyset. May require more extra code than we'd like in pp_aassign. |
552 | |
5387ccf1 |
553 | =head2 Should overload be inheritable? |
554 | |
555 | Should overload be 'contagious' through @ISA so that derived classes |
556 | would inherit their base classes' overload definitions? What to do |
557 | in case of overload conflicts? |
558 | |
cbda53d5 |
559 | =head2 Taint rethink |
560 | |
561 | Should taint be stopped from affecting control flow, if ($tainted)? |
562 | Should tainted symbolic method calls and subref calls be stopped? |
563 | (Look at Ruby's $SAFE levels for inspiration?) |
564 | |
722d2a37 |
565 | =head1 Vague ideas |
e50bb9a1 |
566 | |
722d2a37 |
567 | Ideas which have been discussed, and which may or may not happen. |
e50bb9a1 |
568 | |
722d2a37 |
569 | =head2 ref() in list context |
e50bb9a1 |
570 | |
722d2a37 |
571 | It's unclear what this should do or how to do it without breaking old |
572 | code. |
e50bb9a1 |
573 | |
f86a8bc5 |
574 | =head2 Make tr/// return histogram of characters in list context |
e50bb9a1 |
575 | |
722d2a37 |
576 | There is a patch for this, but it may require Unicodification. |
e50bb9a1 |
577 | |
722d2a37 |
578 | =head2 Compile to real threaded code |
3958b146 |
579 | |
722d2a37 |
580 | =head2 Structured types |
3958b146 |
581 | |
722d2a37 |
582 | =head2 Modifiable $1 et al. |
e50bb9a1 |
583 | |
722d2a37 |
584 | ($x = "elephant") =~ /e(ph)/; |
585 | $1 = "g"; # $x = "elegant" |
e50bb9a1 |
586 | |
722d2a37 |
587 | What happens if there are multiple (nested?) brackets? What if the |
588 | string changes between the match and the assignment? |
e50bb9a1 |
589 | |
722d2a37 |
590 | =head2 Procedural interfaces for IO::*, etc. |
e50bb9a1 |
591 | |
722d2a37 |
592 | Some core modules have been accused of being overly-OO. Adding |
593 | procedural interfaces could demystify them. |
e50bb9a1 |
594 | |
722d2a37 |
595 | =head2 RPC modules |
e50bb9a1 |
596 | |
722d2a37 |
597 | =head2 Attach/detach debugger from running program |
e50bb9a1 |
598 | |
722d2a37 |
599 | With C<gdb>, you can attach the debugger to a running program if you |
600 | pass the process ID. It would be good to do this with the Perl debugger |
601 | on a running Perl program, although I'm not sure how it would be done. |
e50bb9a1 |
602 | |
722d2a37 |
603 | =head2 GUI::Native |
e50bb9a1 |
604 | |
722d2a37 |
605 | A non-core module that would use "native" GUI to create graphical |
606 | applications. |
e50bb9a1 |
607 | |
722d2a37 |
608 | =head2 foreach(reverse ...) |
e50bb9a1 |
609 | |
722d2a37 |
610 | Currently |
e50bb9a1 |
611 | |
722d2a37 |
612 | foreach (reverse @_) { ... } |
e50bb9a1 |
613 | |
722d2a37 |
614 | puts C<@_> on the stack, reverses it putting the reversed version on the |
615 | stack, then iterates forwards. Instead, it could be special-cased to put |
616 | C<@_> on the stack then iterate backwards. |
e50bb9a1 |
617 | |
722d2a37 |
618 | =head2 Constant function cache |
e50bb9a1 |
619 | |
722d2a37 |
620 | =head2 Approximate regular expression matching |
e50bb9a1 |
621 | |
722d2a37 |
622 | =head1 Ongoing |
e50bb9a1 |
623 | |
722d2a37 |
624 | These items B<always> need doing: |
e50bb9a1 |
625 | |
722d2a37 |
626 | =head2 Update guts documentation |
e50bb9a1 |
627 | |
722d2a37 |
628 | Simon Cozens tries to do this when possible, and contributions to the |
629 | C<perlapi> documentation is welcome. |
e50bb9a1 |
630 | |
722d2a37 |
631 | =head2 Add more tests |
e50bb9a1 |
632 | |
722d2a37 |
633 | Michael Schwern will donate $500 to Yet Another Society when all core |
634 | modules have tests. |
e50bb9a1 |
635 | |
722d2a37 |
636 | =head2 Update auxiliary tools |
e50bb9a1 |
637 | |
722d2a37 |
638 | The code we ship with Perl should look like good Perl 5. |
e50bb9a1 |
639 | |
1e278fd9 |
640 | =head2 Create debugging macros |
641 | |
642 | Debugging macros (like printsv, dump) can make debugging perl inside a |
643 | C debugger much easier. A good set for gdb comes with mod_perl. |
644 | Something similar should be distributed with perl. |
645 | |
646 | The proper way to do this is to use and extend Devel::DebugInit. |
647 | Devel::DebugInit also needs to be extended to support threads. |
648 | |
649 | See p5p archives for late May/early June 2001 for a recent discussion |
650 | on this topic. |
651 | |
652 | =head2 truncate to the people |
653 | |
654 | One can emulate ftruncate() using F_FREESP and F_CHSIZ fcntls |
655 | (see the UNIX FAQ for details). This needs to go somewhere near |
656 | pp_sys.c:pp_truncate(). |
657 | |
658 | One can emulate truncate() easily if one has ftruncate(). |
659 | This emulation should also go near pp_sys.pp_truncate(). |
660 | |
661 | =head2 Unicode in Filenames |
662 | |
663 | chdir, chmod, chown, chroot, exec, glob, link, lstat, mkdir, open, qx, |
664 | readdir, readlink, rename, rmdir, stat, symlink, sysopen, system, |
665 | truncate, unlink, utime. All these could potentially accept Unicode |
666 | filenames either as input or output (and in the case of system and qx |
667 | Unicode in general, as input or output to/from the shell). Whether a |
668 | filesystem - an operating system pair understands Unicode in filenames |
669 | varies. |
670 | |
671 | Known combinations that have some level of understanding include |
672 | Microsoft NTFS, Apple HFS+ (In Mac OS 9 and X) and Apple UFS (in Mac |
673 | OS X), NFS v4 is rumored to be Unicode, and of course Plan 9. How to |
674 | create Unicode filenames, what forms of Unicode are accepted and used |
675 | (UCS-2, UTF-16, UTF-8), what (if any) is the normalization form used, |
676 | and so on, varies. Finding the right level of interfacing to Perl |
677 | requires some thought. Remember that an OS does not implicate a |
678 | filesystem. |
679 | |
eb450546 |
680 | Note that in Windows the -C command line flag already does quite |
681 | a bit of the above (but even there the support is not complete: |
682 | for example the exec/spawn are not Unicode-aware) by turning on |
683 | the so-called "wide API support". |
684 | |
722d2a37 |
685 | =head1 Recently done things |
e50bb9a1 |
686 | |
722d2a37 |
687 | These are things which have been on the todo lists in previous releases |
688 | but have recently been completed. |
e50bb9a1 |
689 | |
b0b7f283 |
690 | =head2 Alternative RE syntax module |
691 | |
692 | The C<Regexp::English> module, available from the CPAN, provides this: |
693 | |
694 | my $re = Regexp::English |
695 | -> start_of_line |
696 | -> literal('Flippers') |
697 | -> literal(':') |
698 | -> optional |
699 | -> whitespace_char |
700 | -> end |
701 | -> remember |
702 | -> multiple |
703 | -> digit; |
704 | |
705 | /$re/; |
706 | |
722d2a37 |
707 | =head2 Safe signal handling |
e50bb9a1 |
708 | |
722d2a37 |
709 | A new signal model went into 5.7.1 without much fanfare. Operations and |
710 | C<malloc>s are no longer interrupted by signals, which are handled |
711 | between opcodes. This means that C<PERL_ASYNC_CHECK> now actually does |
712 | something. However, there are still a few things that need to be done. |
e50bb9a1 |
713 | |
722d2a37 |
714 | =head2 Tie Modules |
e50bb9a1 |
715 | |
722d2a37 |
716 | Modules which implement arrays in terms of strings, substrings or files |
717 | can be found on the CPAN. |
e50bb9a1 |
718 | |
722d2a37 |
719 | =head2 gettimeofday |
e50bb9a1 |
720 | |
210b36aa |
721 | C<Time::HiRes> has been integrated into the core. |
e50bb9a1 |
722 | |
722d2a37 |
723 | =head2 setitimer and getimiter |
e50bb9a1 |
724 | |
210b36aa |
725 | Adding C<Time::HiRes> got us this too. |
e50bb9a1 |
726 | |
722d2a37 |
727 | =head2 Testing __DIE__ hook |
728 | |
729 | Tests have been added. |
730 | |
731 | =head2 CPP equivalent in Perl |
e50bb9a1 |
732 | |
722d2a37 |
733 | A C Yardley will probably have done this by the time you can read this. |
734 | This allows for a generalization of the C constant detection used in |
735 | building C<Errno.pm>. |
e50bb9a1 |
736 | |
722d2a37 |
737 | =head2 Explicit switch statements |
e50bb9a1 |
738 | |
722d2a37 |
739 | C<Switch.pm> has been integrated into the core to give you all manner of |
740 | C<switch...case> semantics. |
e50bb9a1 |
741 | |
722d2a37 |
742 | =head2 autocroak |
e50bb9a1 |
743 | |
722d2a37 |
744 | This is C<Fatal.pm>. |
e50bb9a1 |
745 | |
722d2a37 |
746 | =head2 UTF/EBCDIC |
e50bb9a1 |
747 | |
722d2a37 |
748 | Nick Ing-Simmons has made UTF-EBCDIC (UTR13) work with Perl. |
e50bb9a1 |
749 | |
722d2a37 |
750 | EBCDIC? http://www.unicode.org/unicode/reports/tr16/ |
e50bb9a1 |
751 | |
722d2a37 |
752 | =head2 UTF Regexes |
e50bb9a1 |
753 | |
722d2a37 |
754 | Although there are probably some small bugs to be rooted out, Jarkko |
755 | Hietaniemi has made regular expressions polymorphic between bytes and |
756 | characters. |
e50bb9a1 |
757 | |
722d2a37 |
758 | =head2 perlcc to produce executable |
e50bb9a1 |
759 | |
722d2a37 |
760 | C<perlcc> was recently rewritten, and can now produce standalone |
761 | executables. |
e50bb9a1 |
762 | |
722d2a37 |
763 | =head2 END blocks saved in compiled output |
e50bb9a1 |
764 | |
722d2a37 |
765 | =head2 Secure temporary file module |
e50bb9a1 |
766 | |
722d2a37 |
767 | Tim Jenness' C<File::Temp> is now in core. |
e50bb9a1 |
768 | |
722d2a37 |
769 | =head2 Integrate Time::HiRes |
e50bb9a1 |
770 | |
722d2a37 |
771 | This module is now part of core. |
e50bb9a1 |
772 | |
722d2a37 |
773 | =head2 Turn Cwd into XS |
e50bb9a1 |
774 | |
722d2a37 |
775 | Benjamin Sugars has done this. |
e50bb9a1 |
776 | |
722d2a37 |
777 | =head2 Mmap for input |
e50bb9a1 |
778 | |
722d2a37 |
779 | Nick Ing-Simmons' C<perlio> supports an C<mmap> IO method. |
e50bb9a1 |
780 | |
722d2a37 |
781 | =head2 Byte to/from UTF8 and UTF8 to/from local conversion |
e50bb9a1 |
782 | |
722d2a37 |
783 | C<Encode> provides this. |
e50bb9a1 |
784 | |
722d2a37 |
785 | =head2 Add sockatmark support |
e50bb9a1 |
786 | |
722d2a37 |
787 | Added in 5.7.1 |
e50bb9a1 |
788 | |
722d2a37 |
789 | =head2 Mailing list archives |
790 | |
f224927c |
791 | http://lists.perl.org/ , http://archive.develooper.com/ |
722d2a37 |
792 | |
793 | =head2 Bug tracking |
794 | |
795 | Richard Foley has written the bug tracking system at http://bugs.perl.org/ |
e50bb9a1 |
796 | |
722d2a37 |
797 | =head2 Integrate MacPerl |
e50bb9a1 |
798 | |
722d2a37 |
799 | Chris Nandor and Matthias Neeracher have integrated the MacPerl changes |
800 | into 5.6.0. |
e50bb9a1 |
801 | |
722d2a37 |
802 | =head2 Web "nerve center" for Perl |
e50bb9a1 |
803 | |
722d2a37 |
804 | http://use.perl.org/ is what you're looking for. |
e50bb9a1 |
805 | |
722d2a37 |
806 | =head2 Regular expression tutorial |
e50bb9a1 |
807 | |
722d2a37 |
808 | C<perlretut>, provided by Mark Kvale. |
e50bb9a1 |
809 | |
722d2a37 |
810 | =head2 Debugging Tutorial |
e50bb9a1 |
811 | |
722d2a37 |
812 | C<perldebtut>, written by Richard Foley. |
e50bb9a1 |
813 | |
722d2a37 |
814 | =head2 Integrate new modules |
e50bb9a1 |
815 | |
722d2a37 |
816 | Jarkko has been integrating madly into 5.7.x |
e50bb9a1 |
817 | |
722d2a37 |
818 | =head2 Integrate profiler |
e50bb9a1 |
819 | |
722d2a37 |
820 | C<Devel::DProf> is now a core module. |
e50bb9a1 |
821 | |
722d2a37 |
822 | =head2 Y2K error detection |
e50bb9a1 |
823 | |
722d2a37 |
824 | There's a configure option to detect unsafe concatenation with "19", and |
825 | a CPAN module. (C<D'oh::Year>) |
e50bb9a1 |
826 | |
722d2a37 |
827 | =head2 Regular expression debugger |
e50bb9a1 |
828 | |
722d2a37 |
829 | While not part of core, Mark-Jason Dominus has written C<Rx> and has |
830 | also come up with a generalised strategy for regular expression |
831 | debugging. |
e50bb9a1 |
832 | |
722d2a37 |
833 | =head2 POD checker |
e50bb9a1 |
834 | |
722d2a37 |
835 | That's, uh, F<podchecker> |
e50bb9a1 |
836 | |
722d2a37 |
837 | =head2 "Dynamic" lexicals |
e50bb9a1 |
838 | |
722d2a37 |
839 | =head2 Cache precompiled modules |
e50bb9a1 |
840 | |
722d2a37 |
841 | =head1 Deprecated Wishes |
e50bb9a1 |
842 | |
722d2a37 |
843 | These are items which used to be in the todo file, but have been |
844 | deprecated for some reason. |
e50bb9a1 |
845 | |
722d2a37 |
846 | =head2 Loop control on do{} |
e50bb9a1 |
847 | |
722d2a37 |
848 | This would break old code; use C<do{{ }}> instead. |
e50bb9a1 |
849 | |
722d2a37 |
850 | =head2 Lexically scoped typeglobs |
e50bb9a1 |
851 | |
722d2a37 |
852 | Not needed now we have lexical IO handles. |
e50bb9a1 |
853 | |
722d2a37 |
854 | =head2 format BOTTOM |
3958b146 |
855 | |
722d2a37 |
856 | =head2 report HANDLE |
e50bb9a1 |
857 | |
722d2a37 |
858 | Damian Conway's text formatting modules seem to be the Way To Go. |
e50bb9a1 |
859 | |
722d2a37 |
860 | =head2 Generalised want()/caller()) |
3958b146 |
861 | |
638ae6a9 |
862 | Robin Houston's C<Want> module does this. |
863 | |
722d2a37 |
864 | =head2 Named prototypes |
e50bb9a1 |
865 | |
638ae6a9 |
866 | This seems to be delayed until Perl 6. |
e50bb9a1 |
867 | |
722d2a37 |
868 | =head2 Built-in globbing |
e50bb9a1 |
869 | |
722d2a37 |
870 | The C<File::Glob> module has been used to replace the C<glob> function. |
e50bb9a1 |
871 | |
722d2a37 |
872 | =head2 Regression tests for suidperl |
e50bb9a1 |
873 | |
722d2a37 |
874 | C<suidperl> is deprecated in favour of common sense. |
e50bb9a1 |
875 | |
722d2a37 |
876 | =head2 Cached hash values |
e50bb9a1 |
877 | |
722d2a37 |
878 | We have shared hash keys, which perform the same job. |
e50bb9a1 |
879 | |
722d2a37 |
880 | =head2 Add compression modules |
e50bb9a1 |
881 | |
722d2a37 |
882 | The compression modules are a little heavy; meanwhile, Nick Clark is |
883 | working on experimental pragmata to do transparent decompression on |
884 | input. |
e50bb9a1 |
885 | |
722d2a37 |
886 | =head2 Reorganise documentation into tutorials/references |
e50bb9a1 |
887 | |
722d2a37 |
888 | Could not get consensus on P5P about this. |
e50bb9a1 |
889 | |
722d2a37 |
890 | =head2 Remove distinction between functions and operators |
891 | |
892 | Caution: highly flammable. |
893 | |
894 | =head2 Make XS easier to use |
e50bb9a1 |
895 | |
722d2a37 |
896 | Use C<Inline> instead, or SWIG. |
e50bb9a1 |
897 | |
722d2a37 |
898 | =head2 Make embedding easier to use |
e50bb9a1 |
899 | |
722d2a37 |
900 | Use C<Inline::CPR>. |
e50bb9a1 |
901 | |
722d2a37 |
902 | =head2 man for perl |
04c70446 |
903 | |
1577cd80 |
904 | See the Perl Power Tools. ( http://language.perl.com/ppt/ ) |
04c70446 |
905 | |
722d2a37 |
906 | =head2 my $Package::variable |
04c70446 |
907 | |
722d2a37 |
908 | Use C<our> instead. |
04c70446 |
909 | |
722d2a37 |
910 | =head2 "or" tests defined, not truth |
04c70446 |
911 | |
722d2a37 |
912 | Suggesting this on P5P B<will> cause a boring and interminable flamewar. |
04c70446 |
913 | |
722d2a37 |
914 | =head2 "class"-based lexicals |
04c70446 |
915 | |
cbb3fa72 |
916 | Use flyweight objects, secure hashes or, dare I say it, pseudo-hashes instead. |
f86a8bc5 |
917 | (Or whatever will replace pseudohashes in 5.10.) |
04c70446 |
918 | |
722d2a37 |
919 | =head2 byteperl |
04c70446 |
920 | |
722d2a37 |
921 | C<ByteLoader> covers this. |
04c70446 |
922 | |
722d2a37 |
923 | =head2 Lazy evaluation / tail recursion removal |
04c70446 |
924 | |
f86a8bc5 |
925 | C<List::Util> gives first() (a short-circuiting grep); tail recursion |
926 | removal is done manually, with C<goto &whoami;>. (However, MJD has |
927 | found that C<goto &whoami> introduces a performance penalty, so maybe |
928 | there should be a way to do this after all: C<sub foo {START: ... goto |
929 | START;> is better.) |
0562c0e3 |
930 | |
931 | =head2 Make "use utf8" the default |
932 | |
f86a8bc5 |
933 | Because of backward compatibility this is difficult: scripts could not |
934 | contain B<any legacy eight-bit data> (like Latin-1) anymore, even in |
935 | string literals or pod. Also would introduce a measurable slowdown of |
936 | at least few percentages since all regular expression operations would |
937 | be done in full UTF-8. But if you want to try this, add |
938 | -DUSE_UTF8_SCRIPTS to your compilation flags. |
939 | |
3298bd4d |
940 | =head2 Unicode collation and normalization |
941 | |
942 | The Unicode::Collate and Unicode::Normalize modules |
943 | by SADAHIRO Tomoyuki have been included since 5.8.0. |
944 | |
945 | Collation? http://www.unicode.org/unicode/reports/tr10/ |
946 | Normalization? http://www.unicode.org/unicode/reports/tr15/ |
0562c0e3 |
947 | |
1626a787 |
948 | =head2 pack/unpack tutorial |
949 | |
950 | Wolfgang Laun finished what Simon Cozens started. |
951 | |
3298bd4d |
952 | =cut |