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comparison src/luan/modules/parsers/LuanToString.java @ 1189:73d754b1889f

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add stringify
author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 23 Feb 2018 01:40:04 -0700
parents src/luan/lib/json/JsonToString.java@b70102bab110
children db7d31f4089a
comparison
equal deleted inserted replaced
1188:9f5edbef3f55 1189:73d754b1889f
1 package luan.modules.parsers;
2
3 import java.util.List;
4 import java.util.Map;
5 import luan.Luan;
6 import luan.LuanTable;
7 import luan.LuanException;
8
9
10 public final class LuanToString {
11
12 public static String toString(Object obj,boolean strict) throws LuanException {
13 StringBuilder sb = new StringBuilder();
14 new LuanToString(strict).toString(obj,sb,0);
15 return sb.toString();
16 }
17
18 private final boolean strict;
19
20 private LuanToString(boolean strict) {
21 this.strict = strict;
22 }
23
24 private void toString(Object obj,StringBuilder sb,int indented) throws LuanException {
25 if( obj == null ) {
26 sb.append( "nil" );
27 return;
28 }
29 if( obj instanceof Boolean ) {
30 sb.append( obj );
31 return;
32 }
33 if( obj instanceof Number ) {
34 sb.append( Luan.toString((Number)obj) );
35 return;
36 }
37 if( obj instanceof String ) {
38 toString((String)obj,sb);
39 return;
40 }
41 if( obj instanceof LuanTable ) {
42 toString((LuanTable)obj,sb,indented);
43 return;
44 }
45 if( strict )
46 throw new LuanException("can't handle type "+obj.getClass().getName());
47 sb.append( '<' );
48 sb.append( obj );
49 sb.append( '>' );
50 }
51
52 private void toString(final String s,StringBuilder sb) {
53 sb.append( '"' );
54 sb.append( Luan.stringEncode(s) );
55 sb.append( '"' );
56 }
57
58 private void toString(LuanTable tbl,StringBuilder sb,int indented) throws LuanException {
59 List list = tbl.asList();
60 Map map = tbl.rawMap();
61 sb.append( '{' );
62 if( !list.isEmpty() ) {
63 indent(sb,indented+1);
64 for( Object obj : list ) {
65 toString(obj,sb,indented+1);
66 sb.append( ", " );
67 }
68 }
69 for( Object obj : map.entrySet() ) {
70 Map.Entry entry = (Map.Entry)obj;
71 indent(sb,indented+1);
72 toString(entry,sb,indented+1);
73 }
74 if( !list.isEmpty() || !map.isEmpty() )
75 indent(sb,indented);
76 sb.append( '}' );
77 return;
78 }
79
80 private void toString(Map.Entry entry,StringBuilder sb,int indented) throws LuanException {
81 Object key = entry.getKey();
82 if( key instanceof String && ((String)key).matches("[a-zA-Z_][a-zA-Z_0-9]*") ) {
83 sb.append( (String)key );
84 } else {
85 sb.append( '[' );
86 toString( key, sb, indented );
87 sb.append( ']' );
88 }
89 sb.append( " = " );
90 toString( entry.getValue(), sb, indented );
91 }
92
93 private void indent(StringBuilder sb,int indented) {
94 sb.append( '\n' );
95 for( int i=0; i<indented; i++ ) {
96 sb.append( '\t' );
97 }
98 }
99
100 }