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annotate src/luan/modules/parsers/LuanToString.java @ 1190:db7d31f4089a

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minor
author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 23 Feb 2018 15:48:15 -0700
parents 73d754b1889f
children 2024d23ddd64
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 package luan.modules.parsers;
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2
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3 import java.util.List;
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4 import java.util.Map;
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5 import luan.Luan;
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6 import luan.LuanTable;
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7 import luan.LuanException;
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9
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10 public final class LuanToString {
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11
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12 public static String toString(Object obj,boolean strict) throws LuanException {
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13 StringBuilder sb = new StringBuilder();
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14 new LuanToString(strict).toString(obj,sb,0);
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15 return sb.toString();
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16 }
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17
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18 private final boolean strict;
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19
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20 private LuanToString(boolean strict) {
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21 this.strict = strict;
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22 }
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23
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24 private void toString(Object obj,StringBuilder sb,int indented) throws LuanException {
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25 if( obj == null ) {
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26 sb.append( "nil" );
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27 return;
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28 }
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29 if( obj instanceof Boolean ) {
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30 sb.append( obj );
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31 return;
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32 }
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33 if( obj instanceof Number ) {
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34 sb.append( Luan.toString((Number)obj) );
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35 return;
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36 }
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37 if( obj instanceof String ) {
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38 sb.append( '"' );
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39 sb.append( Luan.stringEncode((String)obj) );
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40 sb.append( '"' );
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41 return;
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42 }
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43 if( obj instanceof LuanTable ) {
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44 toString((LuanTable)obj,sb,indented);
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45 return;
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46 }
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47 if( strict )
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48 throw new LuanException("can't handle type "+obj.getClass().getName());
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49 sb.append( '<' );
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50 sb.append( obj );
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51 sb.append( '>' );
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52 }
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53
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54 private void toString(LuanTable tbl,StringBuilder sb,int indented) throws LuanException {
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55 List list = tbl.asList();
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56 Map map = tbl.rawMap();
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57 sb.append( '{' );
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58 if( !list.isEmpty() ) {
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59 indent(sb,indented+1);
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60 for( Object obj : list ) {
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61 toString(obj,sb,indented+1);
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62 sb.append( ", " );
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63 }
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64 }
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65 for( Object obj : map.entrySet() ) {
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66 Map.Entry entry = (Map.Entry)obj;
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67 indent(sb,indented+1);
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68 toString(entry,sb,indented+1);
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69 }
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70 if( !list.isEmpty() || !map.isEmpty() )
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71 indent(sb,indented);
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72 sb.append( '}' );
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73 return;
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74 }
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75
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76 private void toString(Map.Entry entry,StringBuilder sb,int indented) throws LuanException {
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77 Object key = entry.getKey();
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78 if( key instanceof String && ((String)key).matches("[a-zA-Z_][a-zA-Z_0-9]*") ) {
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79 sb.append( (String)key );
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80 } else {
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81 sb.append( '[' );
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82 toString( key, sb, indented );
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83 sb.append( ']' );
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84 }
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85 sb.append( " = " );
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86 toString( entry.getValue(), sb, indented );
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87 }
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88
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89 private void indent(StringBuilder sb,int indented) {
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90 sb.append( '\n' );
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91 for( int i=0; i<indented; i++ ) {
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92 sb.append( '\t' );
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93 }
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94 }
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95
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96 }