Mercurial Hosting > luan
view src/goodjava/json/JsonToString.java @ 1786:bda4ec615c5b
minor
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Sun, 10 Dec 2023 21:17:21 -0700 |
parents | 99a8ac891914 |
children |
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package goodjava.json; import java.util.List; import java.util.Map; import java.util.Iterator; public final class JsonToString { public boolean compressed = false; public static final class JsonException extends RuntimeException { private JsonException(String msg) { super(msg); } } public String toString(Object obj) throws JsonException { StringBuilder sb = new StringBuilder(); toString(obj,sb,0); return sb.toString(); } private void toString(Object obj,StringBuilder sb,int indented) throws JsonException { if( obj == null || obj instanceof Boolean || obj instanceof Number ) { sb.append(obj); return; } if( obj instanceof String ) { toString((String)obj,sb); return; } if( obj instanceof List ) { toString((List)obj,sb,indented); return; } if( obj instanceof Map ) { toString((Map)obj,sb,indented); return; } throw new JsonException("can't handle type "+obj.getClass().getName()); } private static void toString(final String s,StringBuilder sb) { sb.append('"'); for( int i=0; i<s.length(); i++ ) { char c = s.charAt(i); switch(c) { case '"': sb.append("\\\""); break; case '\\': sb.append("\\\\"); break; case '\b': sb.append("\\b"); break; case '\f': sb.append("\\f"); break; case '\n': sb.append("\\n"); break; case '\r': sb.append("\\r"); break; case '\t': sb.append("\\t"); break; default: sb.append(c); } } sb.append('"'); } public static String javascriptEncode(String s) { StringBuilder sb = new StringBuilder(); for( int i=0; i<s.length(); i++ ) { char c = s.charAt(i); switch(c) { case '"': sb.append("\\\""); break; case '\'': // added for javascript sb.append("\\'"); break; case '\\': sb.append("\\\\"); break; case '\b': sb.append("\\b"); break; case '\f': sb.append("\\f"); break; case '\n': sb.append("\\n"); break; case '\r': sb.append("\\r"); break; case '\t': sb.append("\\t"); break; default: sb.append(c); } } return sb.toString(); } private void toString(List list,StringBuilder sb,int indented) { sb.append('['); if( !list.isEmpty() ) { indent(sb,indented+1); toString(list.get(0),sb,indented+1); final int n = list.size(); for( int i=1; i<n; i++ ) { sb.append(','); indent(sb,indented+1); toString(list.get(i),sb,indented+1); } indent(sb,indented); } sb.append(']'); return; } private void toString(Map map,StringBuilder sb,int indented) throws JsonException { sb.append('{'); if( !map.isEmpty() ) { Iterator<Map.Entry> i = map.entrySet().iterator(); indent(sb,indented+1); toString(i.next(),sb,indented+1); while( i.hasNext() ) { sb.append(','); indent(sb,indented+1); toString(i.next(),sb,indented+1); } indent(sb,indented); } sb.append('}'); } private void toString(Map.Entry entry,StringBuilder sb,int indented) throws JsonException { Object key = entry.getKey(); if( !(key instanceof String) ) throw new JsonException("table keys must be strings but got "+key.getClass().getSimpleName()+" ("+key+"="+entry.getValue()+")"); toString((String)key,sb); sb.append( compressed ? ":" : ": " ); toString(entry.getValue(),sb,indented); } private void indent(StringBuilder sb,int indented) { if( compressed ) return; sb.append('\n'); for( int i=0; i<indented; i++ ) { sb.append('\t'); } } }