| 1 | /* |
| 2 | * Copyright (C) 2009 Google Inc. |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package com.google.gson; |
| 17 | |
| 18 | import java.io.IOException; |
| 19 | import java.io.Reader; |
| 20 | import java.io.StringReader; |
| 21 | |
| 22 | import com.google.gson.internal.Streams; |
| 23 | import com.google.gson.stream.JsonReader; |
| 24 | import com.google.gson.stream.JsonToken; |
| 25 | import com.google.gson.stream.MalformedJsonException; |
| 26 | |
| 27 | /** |
| 28 | * A parser to parse Json into a parse tree of {@link JsonElement}s |
| 29 | * |
| 30 | * @author Inderjeet Singh |
| 31 | * @author Joel Leitch |
| 32 | * @since 1.3 |
| 33 | */ |
| 34 | public final class JsonParser { |
| 35 | |
| 36 | /** |
| 37 | * Parses the specified JSON string into a parse tree |
| 38 | * |
| 39 | * @param json JSON text |
| 40 | * @return a parse tree of {@link JsonElement}s corresponding to the specified JSON |
| 41 | * @throws JsonParseException if the specified text is not valid JSON |
| 42 | * @since 1.3 |
| 43 | */ |
| 44 | public JsonElement parse(String json) throws JsonSyntaxException { |
| 45 | return parse(new StringReader(json)); |
| 46 | } |
| 47 | |
| 48 | /** |
| 49 | * Parses the specified JSON string into a parse tree |
| 50 | * |
| 51 | * @param json JSON text |
| 52 | * @return a parse tree of {@link JsonElement}s corresponding to the specified JSON |
| 53 | * @throws JsonParseException if the specified text is not valid JSON |
| 54 | * @since 1.3 |
| 55 | */ |
| 56 | public JsonElement parse(Reader json) throws JsonIOException, JsonSyntaxException { |
| 57 | try { |
| 58 | JsonReader jsonReader = new JsonReader(json); |
| 59 | JsonElement element = parse(jsonReader); |
| 60 | if (!element.isJsonNull() && jsonReader.peek() != JsonToken.END_DOCUMENT) { |
| 61 | throw new JsonSyntaxException("Did not consume the entire document."); |
| 62 | } |
| 63 | return element; |
| 64 | } catch (MalformedJsonException e) { |
| 65 | throw new JsonSyntaxException(e); |
| 66 | } catch (IOException e) { |
| 67 | throw new JsonIOException(e); |
| 68 | } catch (NumberFormatException e) { |
| 69 | throw new JsonSyntaxException(e); |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * Returns the next value from the JSON stream as a parse tree. |
| 75 | * |
| 76 | * @throws JsonParseException if there is an IOException or if the specified |
| 77 | * text is not valid JSON |
| 78 | * @since 1.6 |
| 79 | */ |
| 80 | public JsonElement parse(JsonReader json) throws JsonIOException, JsonSyntaxException { |
| 81 | boolean lenient = json.isLenient(); |
| 82 | json.setLenient(true); |
| 83 | try { |
| 84 | return Streams.parse(json); |
| 85 | } catch (StackOverflowError e) { |
| 86 | throw new JsonParseException("Failed parsing JSON source: " + json + " to Json", e); |
| 87 | } catch (OutOfMemoryError e) { |
| 88 | throw new JsonParseException("Failed parsing JSON source: " + json + " to Json", e); |
| 89 | } finally { |
| 90 | json.setLenient(lenient); |
| 91 | } |
| 92 | } |
| 93 | } |