1 | // learns to exchange common prefixes and suffixes. |
2 | // maybe it's not perfect... see #1000491 for a problem case |
3 | |
4 | static class LPrefixSuffix extends LearnerImpl {
|
5 | static boolean debug; |
6 | String prefixIn, suffixIn, prefixOut, suffixOut; |
7 | |
8 | public void processInOut(Object _in, Object _out) {
|
9 | String in = (String) _in, out = (String) _out; |
10 | updateIn(in); |
11 | prefixOut = prefixOut == null ? out : commonPrefix(prefixOut, out); |
12 | suffixOut = suffixOut == null ? out : commonSuffix(suffixOut, out); |
13 | if (debug) |
14 | printState("processInOut(" + quote(in) + ", " + quote(out) + ")");
|
15 | } |
16 | |
17 | void updateIn(String in) {
|
18 | prefixIn = prefixIn == null ? in : commonPrefix(prefixIn, in); |
19 | suffixIn = suffixIn == null ? in : commonSuffix(suffixIn, in); |
20 | if (debug) |
21 | printState("updateIn(" + quote(in) + ")");
|
22 | } |
23 | |
24 | public String processIn(Object _in) {
|
25 | String in = (String) _in; |
26 | //System.out.println("[before last info] " + quote(prefixIn) + " " + quote(suffixIn) + " " + quote(prefixOut) + " " + quote(suffixOut));
|
27 | //System.out.println("[last info] " + quote(in));
|
28 | |
29 | // use latest information |
30 | String p = prefixIn, s = suffixIn; |
31 | updateIn(in); |
32 | prefixOut = prefixOut.substring(0, prefixOut.length()-(p.length()-prefixIn.length())); |
33 | suffixOut = suffixOut.substring(s.length()-suffixIn.length()); |
34 | |
35 | //System.out.println("[after last info] " + quote(prefixIn) + " " + quote(suffixIn) + " " + quote(prefixOut) + " " + quote(suffixOut));
|
36 | String core = in.substring(prefixIn.length(), in.length()-suffixIn.length()); |
37 | return prefixOut + core + suffixOut; |
38 | } |
39 | |
40 | public void toJava(Code code) {
|
41 | if (prefixIn.length() != 0 || suffixIn.length() != 0) |
42 | code.line(code.var + " = ((String) " + code.var + ").substring(" + prefixIn.length() + ", " + code.s() + ".length()-" + suffixIn.length() + ");");
|
43 | if (prefixOut.length() != 0 || suffixOut.length() != 0) |
44 | code.line(code.var + " = " + quote(prefixOut) + " + " + code.var + " + " + quote(suffixOut) + ";"); |
45 | } |
46 | |
47 | void printState(String text) {
|
48 | System.out.println(text); |
49 | printVars(); |
50 | } |
51 | } |
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| Snippet ID: | #1000492 |
| Snippet name: | LPrefixSuffix (learner) |
| Eternal ID of this version: | #1000492/1 |
| Text MD5: | 9f08a357926204438d2dd3cbc5ccf057 |
| Author: | stefan |
| Category: | |
| Type: | JavaX fragment (include) |
| Public (visible to everyone): | Yes |
| Archived (hidden from active list): | No |
| Created/modified: | 2015-08-09 15:02:59 |
| Source code size: | 2284 bytes / 51 lines |
| Pitched / IR pitched: | No / Yes |
| Views / Downloads: | 776 / 1738 |
| Referenced in: | [show references] |