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comparison src/nabble/naml/namespaces/RegexNamespace.java @ 0:7ecd1a4ef557

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author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 21 Mar 2019 19:15:52 -0600
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-1:000000000000 0:7ecd1a4ef557
1 package nabble.naml.namespaces;
2
3 import nabble.naml.compiler.Command;
4 import nabble.naml.compiler.CommandSpec;
5 import nabble.naml.compiler.IPrintWriter;
6 import nabble.naml.compiler.Interpreter;
7 import nabble.naml.compiler.Namespace;
8
9 import java.util.regex.Matcher;
10
11
12 @Namespace (
13 name = "regex",
14 global = true
15 )
16 public class RegexNamespace extends Sequence {
17 private final Matcher matcher;
18 private final String source; // only for debugging
19 private boolean started = false;
20 private boolean isFound = false;
21
22 public RegexNamespace(Matcher matcher,String source) {
23 this.matcher = matcher;
24 this.source = source;
25 }
26
27 private boolean find() {
28 started = true;
29 return isFound = matcher.find();
30 }
31
32 @Command public void find(IPrintWriter out,Interpreter interp) {
33 out.print( find() );
34 }
35
36 @Command public void matches(IPrintWriter out,Interpreter interp) {
37 out.print( matcher.matches() );
38 }
39
40 public static final CommandSpec found = new CommandSpec.Builder()
41 .optionalParameters("group")
42 .build()
43 ;
44
45 @Command public void found(IPrintWriter out,Interpreter interp) {
46 String group = interp.getArgString("group");
47 out.print( group==null ? matcher.group() : matcher.group(Integer.parseInt(group)) );
48 }
49
50 @Command public void has_more_elements(IPrintWriter out,Interpreter interp) {
51 if( !started ) {
52 out.print( matcher.find() );
53 matcher.reset();
54 } else if( isFound ) {
55 int start = matcher.start();
56 out.print( matcher.find() );
57 if( !matcher.find(start) )
58 throw new RuntimeException();
59 } else {
60 out.print( false );
61 }
62 }
63
64 @Command public void next_element(IPrintWriter out,Interpreter interp) {
65 out.print( find() );
66 }
67
68 @Command public void current_element(IPrintWriter out,Interpreter interp) {
69 out.print( matcher.group() );
70 }
71
72 }