RalleYTN / SimpleJSON / 46

Build # 46

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Committed by Ralph Niemitz

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Implemented a solution for issue #5

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/src/main/java/de/ralleytn/simple/json/JSONParser.java

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package de.ralleytn.simple.json;

import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.util.List;
import java.util.Map;
import java.util.Stack;

import de.ralleytn.simple.json.internal.Yylex;
import de.ralleytn.simple.json.internal.Yytoken;


/**
 * Parses JSON data (<u>not</u> thread-safe).
 * @author FangYidong(fangyidong@yahoo.com.cn)
 * @author Ralph Niemitz/RalleYTN(ralph.niemitz@gmx.de)
 * @version 2.1.0
 * @since 1.0.0
 */
public class JSONParser {
        
        private static final int STATUS_INIT = 0;
        private static final int STATUS_IN_FINISHED_VALUE = 1;
        private static final int STATUS_IN_OBJECT = 2;
        private static final int STATUS_IN_ARRAY = 3;
        private static final int STATUS_PASSED_PAIR_KEY = 4;
        private static final int STATUS_IN_PAIR_VALUE = 5;
        private static final int STATUS_END = 6;
        private static final int STATUS_IN_ERROR = -1;

        private Stack<Object> handlerStatusStack;
        private Yylex lexer = new Yylex((Reader)null);
        private Yytoken token;
        private Yytoken lastToken;
        private int status = STATUS_INIT;
        
        private final void nextToken() throws JSONParseException, IOException {
                
                this.token = this.lexer.yylex();
                
                if(this.token == null) {
                        
                        this.token = new Yytoken(Yytoken.TYPE_EOF, null);
                }
        }
        
        private final void init(Stack<Object> statusStack, Stack<Object> valueStack) {
                
                if(this.token.type == Yytoken.TYPE_VALUE) {
                        
                        this.status = STATUS_IN_FINISHED_VALUE;
                        statusStack.push(this.status);
                        valueStack.push(this.token.value);
                        
                } else if(this.token.type == Yytoken.TYPE_LEFT_BRACE) {
                        
                        this.status = STATUS_IN_OBJECT;
                        statusStack.push(this.status);
                        valueStack.push(new JSONObject());
                        
                } else if(this.token.type == Yytoken.TYPE_LEFT_SQUARE) {
                        
                        this.status = STATUS_IN_ARRAY;
                        statusStack.push(this.status);
                        valueStack.push(new JSONArray());
                        
                } else {
                        
                        this.status = STATUS_IN_ERROR;
                }
        }
        
        private final Object inFinishedValue(Stack<Object> valueStack) throws JSONParseException {
                
                if(this.token.type == Yytoken.TYPE_EOF) {
                        
                        return valueStack.pop();
                        
                } else {
                        
                        throw new JSONParseException(this.getPosition(), JSONParseException.ERROR_UNEXPECTED_TOKEN, this.token);
                }
        }
        
        private final void inObject(Stack<Object> statusStack, Stack<Object> valueStack) {
                
                if(this.token.type == Yytoken.TYPE_VALUE) {
                        
                        if(this.token.value instanceof String) {
                                
                                String key = (String)this.token.value;
                                valueStack.push(key);
                                this.status = STATUS_PASSED_PAIR_KEY;
                                statusStack.push(this.status);
                                
                        } else {
                                
                                this.status = STATUS_IN_ERROR;
                        }
                        
                } else if(this.token.type == Yytoken.TYPE_RIGHT_BRACE) {
                        
                        if(valueStack.size() > 1){
                                
                                statusStack.pop();
                                valueStack.pop();
                                this.status = (int)statusStack.peek();
                                
                        } else {
                                
                                this.status = STATUS_IN_FINISHED_VALUE;
                        }
                        
                } else if(this.token.type != Yytoken.TYPE_COMMA) {
                        
                        this.status = STATUS_IN_ERROR;
                }
        }
        
        @SuppressWarnings("unchecked")
        private final void inPassedPairKey(Stack<Object> statusStack, Stack<Object> valueStack) {
                
                if(this.token.type == Yytoken.TYPE_VALUE) {
                        
                        statusStack.pop();
                        String key = (String)valueStack.pop();
                        Map<Object, Object> parent = (Map<Object, Object>)valueStack.peek();
                        parent.put(key, this.token.value);
                        this.status = (int)statusStack.peek();
                        
                } else if(this.token.type == Yytoken.TYPE_LEFT_SQUARE) {
                        
                        statusStack.pop();
                        String key = (String)valueStack.pop();
                        Map<Object, Object> parent = (Map<Object, Object>)valueStack.peek();
                        List<Object> newArray = new JSONArray();
                        parent.put(key, newArray);
                        this.status = STATUS_IN_ARRAY;
                        statusStack.push(this.status);
                        valueStack.push(newArray);
                        
                } else if(this.token.type == Yytoken.TYPE_LEFT_BRACE) {
                        
                        statusStack.pop();
                        String key = (String)valueStack.pop();
                        Map<Object, Object> parent = (Map<Object, Object>)valueStack.peek();
                        Map<Object, Object> newObject = new JSONObject();
                        parent.put(key, newObject);
                        this.status = STATUS_IN_OBJECT;
                        statusStack.push(this.status);
                        valueStack.push(newObject);
                        
                } else if(this.token.type != Yytoken.TYPE_COLON) {
                        
                        this.status = STATUS_IN_ERROR;
                }
        }
        
        @SuppressWarnings("unchecked")
        private final void inArray(Stack<Object> statusStack, Stack<Object> valueStack) {
                
                if(this.token.type == Yytoken.TYPE_VALUE) {
                        
                        List<Object> val = (List<Object>)valueStack.peek();
                        val.add(this.token.value);
                        
                } else if(this.token.type == Yytoken.TYPE_RIGHT_SQUARE) {
                        
                        if(valueStack.size() > 1) {
                                
                                statusStack.pop();
                                valueStack.pop();
                                this.status = (int)statusStack.peek();
                        
                        } else {
                                
                                this.status = STATUS_IN_FINISHED_VALUE;
                        }
                        
                } else if(this.token.type == Yytoken.TYPE_LEFT_BRACE) {
                        
                        List<Object> val = (List<Object>)valueStack.peek();
                        Map<Object, Object> newObject = new JSONObject();
                        val.add(newObject);
                        this.status = STATUS_IN_OBJECT;
                        statusStack.push(this.status);
                        valueStack.push(newObject);
                        
                } else if(this.token.type == Yytoken.TYPE_LEFT_SQUARE) {
                        
                        List<Object> val = (List<Object>)valueStack.peek();
                        List<Object> newArray = new JSONArray();
                        val.add(newArray);
                        this.status = STATUS_IN_ARRAY;
                        statusStack.push(this.status);
                        valueStack.push(newArray);
                        
                } else if(this.token.type != Yytoken.TYPE_COMMA) {
                        
                        this.status = STATUS_IN_ERROR;
                }
        }
        
    /**
     * Resets the parser to the initial state without resetting the underlying reader.
     * @since 1.0.0
     */
    public void reset() {
            
        this.token = null;
        this.lastToken = null;
        this.status = STATUS_INIT;
        this.handlerStatusStack = null;
    }
    
    /**
     * Resets the parser to the initial state with a new character reader.
     * @param reader the new character reader
     * @since 1.0.0
     */
        public void reset(Reader reader) {
                
                this.lexer.yyreset(reader);
                this.reset();
        }
        
        private void reset(Reader reader, boolean resume) {
                
                if(!resume || this.handlerStatusStack == null) {
                        
                        this.reset(reader);
                        this.handlerStatusStack = new Stack<>();
                }
        }
        
        /**
         * @return the position where the current token begins
         * @since 1.0.0
         */
        public int getPosition() {
                
                return this.lexer.getPosition();
        }
        
        /**
         * Parses JSON data.
         * @param json the JSON data
         * @return An instance of:
         * <ul>
         * <li>{@linkplain JSONObject}</li>
         * <li>{@linkplain JSONArray}</li>
         * <li>{@linkplain String}</li>
         * <li>{@linkplain Number}</li>
         * <li>{@linkplain Boolean}</li>
         * <li>{@code null}</li>
         * </ul>
         * @throws JSONParseException if the JSON is invalid
         * @since 1.0.0
         */
        public Object parse(String json) throws JSONParseException {
                
                return this.parse(json, false);
        }

        /**
         * Parses JSON data.
         * @param json the JSON data
         * @param strict {@code true} for strict validation of JSON data; {@code false} if missing colons and commas should be tolerated
         * @return An instance of:
         * <ul>
         * <li>{@linkplain JSONObject}</li>
         * <li>{@linkplain JSONArray}</li>
         * <li>{@linkplain String}</li>
         * <li>{@linkplain Number}</li>
         * <li>{@linkplain Boolean}</li>
         * <li>{@code null}</li>
         * </ul>
         * @throws JSONParseException if the JSON is invalid
         * @since 2.1.0
         */
        public Object parse(String json, boolean strict) throws JSONParseException {
                
                try(StringReader reader = new StringReader(json)) {
                        
                        return this.parse(reader, strict);
                        
                } catch(IOException exception) {
                        
                        // WILL NEVER HAPPEN!
                        throw new RuntimeException(exception);
                }
        }
        
        /**
         * Parses JSON data from a {@linkplain Reader}.
         * @param reader the {@linkplain Reader}
         * @return An instance of:
         * <ul>
         * <li>{@linkplain JSONObject}</li>
         * <li>{@linkplain JSONArray}</li>
         * <li>{@linkplain String}</li>
         * <li>{@linkplain Number}</li>
         * <li>{@linkplain Boolean}</li>
         * <li>{@code null}</li>
         * </ul>
         * @throws IOException if an I/O error occurs
         * @throws JSONParseException if the JSON is invalid
         * @since 1.0.0
         */
        public Object parse(Reader reader) throws IOException, JSONParseException {
                
                return this.parse(reader, false);
        }
        
        /**
         * Parses JSON data from a {@linkplain Reader}.
         * @param reader the {@linkplain Reader}
         * @param strict {@code true} for strict validation of JSON data; {@code false} if missing colons and commas should be tolerated
         * @return An instance of:
         * <ul>
         * <li>{@linkplain JSONObject}</li>
         * <li>{@linkplain JSONArray}</li>
         * <li>{@linkplain String}</li>
         * <li>{@linkplain Number}</li>
         * <li>{@linkplain Boolean}</li>
         * <li>{@code null}</li>
         * </ul>
         * @throws IOException if an I/O error occurs
         * @throws JSONParseException if the JSON is invalid
         * @since 2.1.0
         */
        public Object parse(Reader reader, boolean strict) throws IOException, JSONParseException {
                
                this.reset(reader);
                Stack<Object> statusStack = new Stack<>();
                Stack<Object> valueStack = new Stack<>();

                do {
                        
                        this.nextToken();
                        
                        if(strict) {
                                
                                this.validateCommaAndColonPlacement();
                        }
                        
                        switch(this.status) {
                                case STATUS_INIT:
                                        this.init(statusStack, valueStack);
                                        break;
                                case STATUS_IN_FINISHED_VALUE:
                                        return this.inFinishedValue(valueStack);
                                case STATUS_IN_OBJECT:
                                        this.inObject(statusStack, valueStack);
                                        break;
                                case STATUS_PASSED_PAIR_KEY:
                                        this.inPassedPairKey(statusStack, valueStack);
                                        break;
                                case STATUS_IN_ARRAY:
                                        this.inArray(statusStack, valueStack);
                                        break;
                                default:
                                        // WILL NEVER HAPPEN
                        }

                        if(this.status == STATUS_IN_ERROR) {
                                
                                throw new JSONParseException(getPosition(), JSONParseException.ERROR_UNEXPECTED_TOKEN, token);
                        }
                        
                        this.lastToken = this.token;
        
                } while(this.token.type != Yytoken.TYPE_EOF);

                // TODO
                // Is this code reachable? If yes, then how?
                
                throw new JSONParseException(this.getPosition(), JSONParseException.ERROR_UNEXPECTED_TOKEN, this.token);
        }
        
        /**
         * Goes over a JSON string step by step using a {@linkplain JSONContentHandler}.
         * @param string the JSON string
         * @param contentHandler the {@linkplain JSONContentHandler}
         * @throws JSONParseException if the JSON is invalid or the {@linkplain JSONContentHandler} throws it
         * @since 1.0.0
         */
        public void parse(String string, JSONContentHandler contentHandler) throws JSONParseException {
                
                this.parse(string != null ? string.trim() : null, contentHandler, false);
        }
        
        /**
         * Goes over a JSON string step by step using a {@linkplain JSONContentHandler}.
         * @param string the JSON string
         * @param contentHandler the {@linkplain JSONContentHandler}
         * @param resume Indicates if the previous parsing operation should be continued.
         * @throws JSONParseException if the JSON is invalid or the {@linkplain JSONContentHandler} throws it
         * @since 1.0.0
         */
        public void parse(String string, JSONContentHandler contentHandler, boolean resume) throws JSONParseException {

                try(StringReader reader = new StringReader(string != null ? string.trim() : null)) {
                        
                        this.parse(reader, contentHandler, resume);
                
                } catch(IOException exception){

                        throw new JSONParseException(-1, JSONParseException.ERROR_UNEXPECTED_EXCEPTION, exception);
                }
        }
        
        /**
         * Goes over JSON data step by step using a {@linkplain JSONContentHandler}.
         * @param reader the {@linkplain Reader}
         * @param contentHandler the {@linkplain JSONContentHandler}
         * @throws IOException if an I/O error occurs or the {@linkplain JSONContentHandler} throws it
         * @throws JSONParseException if the JSON is invalid or the {@linkplain JSONContentHandler} throws it
         * @since 1.0.0
         */
        public void parse(Reader reader, JSONContentHandler contentHandler) throws IOException, JSONParseException {
                
                this.parse(reader, contentHandler, false);
        }
        
        /**
         * Goes over JSON data step by step using a {@linkplain JSONContentHandler}.
         * @see JSONContentHandler
         * @param reader the {@linkplain Reader}
         * @param contentHandler the {@linkplain JSONContentHandler}
         * @param resume Indicates if the previous parsing operation should be continued.
         * @throws IOException if an I/O error occurs or the {@linkplain JSONContentHandler} throws it
         * @throws JSONParseException if the JSON is invalid or the {@linkplain JSONContentHandler} throws it
         * @since 1.0.0
         */
        public void parse(Reader reader, JSONContentHandler contentHandler, boolean resume) throws IOException, JSONParseException {
                
                this.parse(reader, contentHandler, resume, false);
        }
        
        /**
         * Goes over JSON data step by step using a {@linkplain JSONContentHandler}.
         * @see JSONContentHandler
         * @param reader the {@linkplain Reader}
         * @param contentHandler the {@linkplain JSONContentHandler}
         * @param resume Indicates if the previous parsing operation should be continued.
         * @param strict {@code true} for strict validation of JSON data; {@code false} if missing colons and commas should be tolerated
         * @throws IOException if an I/O error occurs or the {@linkplain JSONContentHandler} throws it
         * @throws JSONParseException if the JSON is invalid or the {@linkplain JSONContentHandler} throws it
         * @since 2.1.0
         */
        public void parse(Reader reader, JSONContentHandler contentHandler, boolean resume, boolean strict) throws IOException, JSONParseException {
                
                this.reset(reader, resume);
                Stack<Object> statusStack = this.handlerStatusStack;        
                
                try {
                        
                        do {
                                
                                if(strict) {
                                        
                                        this.validateCommaAndColonPlacement();
                                }
                                
                                switch(this.status) {
                                        case STATUS_INIT:
                                                if(this.handleStatusInit(statusStack, contentHandler))
                                                        return;
                                                break;
                                        case STATUS_IN_FINISHED_VALUE:
                                                if(this.handleStatusInFinishedValue(statusStack, contentHandler))
                                                        return;
                                                break;
                                        case STATUS_IN_OBJECT:
                                                if(this.handleStatusInObject(statusStack, contentHandler))
                                                        return;
                                                break;
                                        case STATUS_PASSED_PAIR_KEY:
                                                if(this.handleStatusPassedPairKey(statusStack, contentHandler))
                                                        return;
                                                break;
                                        case STATUS_IN_PAIR_VALUE:
                                                if(this.handleStatusInPairValue(statusStack, contentHandler))
                                                        return;
                                                break;
                                        case STATUS_IN_ARRAY:
                                                if(this.handleStatusInArray(statusStack, contentHandler))
                                                        return;
                                                break;
                                        case STATUS_END:
                                                return;
                                        default:
                                                throw new JSONParseException(this.getPosition(), JSONParseException.ERROR_UNEXPECTED_TOKEN, this.token);
                                }
                                
                                this.lastToken = this.token;
                                
                        } while(this.token.type != Yytoken.TYPE_EOF);
                
                } catch(IOException | JSONParseException | RuntimeException | Error exception) {
                        
                        this.status = STATUS_IN_ERROR;
                        throw exception;
                }
                
                // TODO
                // Is this code reachable? If yes, then how?
                
                this.status = STATUS_IN_ERROR;
                throw new JSONParseException(this.getPosition(), JSONParseException.ERROR_UNEXPECTED_TOKEN, this.token);
        }
        
        private void validateCommaAndColonPlacement() throws JSONParseException {
                
                if(this.token.type == Yytoken.TYPE_VALUE) {
                        
                        if(this.status == STATUS_IN_ARRAY) {
                                
                                if(!(this.lastToken.type == Yytoken.TYPE_COMMA || this.lastToken.type == Yytoken.TYPE_LEFT_SQUARE)) {
                                        
                                        throw new JSONParseException(getPosition(), JSONParseException.ERROR_UNEXPECTED_TOKEN, token);
                                }
                                
                        } else if(this.status == STATUS_IN_OBJECT) {
                                
                                if(!(this.lastToken.type == Yytoken.TYPE_COLON ||
                                         this.lastToken.type == Yytoken.TYPE_LEFT_BRACE ||
                                         this.lastToken.type == Yytoken.TYPE_COMMA)) {

                                        throw new JSONParseException(getPosition(), JSONParseException.ERROR_UNEXPECTED_TOKEN, token);
                                }
                        }
                }
        }
        
        private boolean handleStatusInArray(Stack<Object> statusStack, JSONContentHandler contentHandler) throws JSONParseException, IOException {
                
                this.nextToken();
                
                if(this.token.type == Yytoken.TYPE_VALUE) {
                        
                        if(!contentHandler.primitive(this.token.value)) {
                                
                                return true;
                        }
                        
                } else if(this.token.type == Yytoken.TYPE_RIGHT_SQUARE) {
                        
                        if(statusStack.size() > 1) {
                                
                                statusStack.pop();
                                this.status = (int)statusStack.peek();
                                
                        } else {
                                
                                this.status = STATUS_IN_FINISHED_VALUE;
                        }
                        
                        if(!contentHandler.endArray()) {
                                
                                return true;
                        }
                        
                } else if(this.token.type == Yytoken.TYPE_LEFT_BRACE) {
                        
                        return this.pushStatusInObject(statusStack, contentHandler);
                        
                } else if(this.token.type == Yytoken.TYPE_LEFT_SQUARE) {
                        
                        return this.pushStatusInArray(statusStack, contentHandler);
                        
                } else if(this.token.type != Yytoken.TYPE_COMMA) {
                        
                        this.status = STATUS_IN_ERROR;
                }
                
                return false;
        }
        
        private boolean handleStatusInPairValue(Stack<Object> statusStack, JSONContentHandler contentHandler) throws JSONParseException, IOException {
                
                statusStack.pop();
                this.status = (int)statusStack.peek();
                
                if(!contentHandler.endObjectEntry()) {
                        
                        return true;
                }
                
                return false;
        }
        
        private boolean handleStatusPassedPairKey(Stack<Object> statusStack, JSONContentHandler contentHandler) throws JSONParseException, IOException {
                
                this.nextToken();
                
                if(this.token.type == Yytoken.TYPE_VALUE) {
                        
                        statusStack.pop();
                        this.status = (int)statusStack.peek();
                        
                        if(!contentHandler.primitive(this.token.value) || !contentHandler.endObjectEntry()) {
                                
                                return true;
                        }
                        
                } else if(this.token.type == Yytoken.TYPE_LEFT_SQUARE) {
                        
                        statusStack.pop();
                        statusStack.push(STATUS_IN_PAIR_VALUE);
                        this.status = STATUS_IN_ARRAY;
                        statusStack.push(this.status);
                        
                        if(!contentHandler.startArray()) {
                                
                                return true;
                        }
                        
                } else if(this.token.type == Yytoken.TYPE_LEFT_BRACE) {
                        
                        statusStack.pop();
                        statusStack.push(STATUS_IN_PAIR_VALUE);
                        this.status = STATUS_IN_OBJECT;
                        statusStack.push(this.status);
                        
                        if(!contentHandler.startObject()) {
                                
                                return true;
                        }
                        
                } else if(this.token.type != Yytoken.TYPE_COLON) {
                        
                        this.status = STATUS_IN_ERROR;
                }
                
                return false;
        }
        
        private boolean handleStatusInObject(Stack<Object> statusStack, JSONContentHandler contentHandler) throws JSONParseException, IOException {
                
                this.nextToken();
                
                if(this.token.type == Yytoken.TYPE_VALUE) {
                        
                        if(this.token.value instanceof String) {
                                
                                String key = (String)this.token.value;
                                this.status = STATUS_PASSED_PAIR_KEY;
                                statusStack.push(this.status);
                                
                                if(!contentHandler.startObjectEntry(key)) {
                                        
                                        return true;
                                }
                                
                        } else {
                                
                                this.status = STATUS_IN_ERROR;
                        }
                        
                } else if(this.token.type == Yytoken.TYPE_RIGHT_BRACE) {
                        
                        if(statusStack.size() > 1) {
                                
                                statusStack.pop();
                                this.status = (int)statusStack.peek();
                                
                        } else {
                                
                                this.status = STATUS_IN_FINISHED_VALUE;
                        }
                        
                        if(!contentHandler.endObject()) {
                                
                                return true;
                        }
                        
                } else if(this.token.type != Yytoken.TYPE_COMMA) {
                        
                        this.status = STATUS_IN_ERROR;
                }
                
                return false;
        }
        
        private boolean handleStatusInFinishedValue(Stack<Object> statusStack, JSONContentHandler contentHandler) throws JSONParseException, IOException {
                
                this.nextToken();
                
                if(this.token.type == Yytoken.TYPE_EOF) {
                        
                        contentHandler.endJSON();
                        this.status = STATUS_END;
                        return true;
                        
                } else {
                        
                        this.status = STATUS_IN_ERROR;
                }
                
                return false;
        }
        
        private boolean handleStatusInit(Stack<Object> statusStack, JSONContentHandler contentHandler) throws JSONParseException, IOException {
                
                contentHandler.startJSON();
                this.nextToken();
                
                if(this.token.type == Yytoken.TYPE_VALUE) {
                        
                        this.status = STATUS_IN_FINISHED_VALUE;
                        statusStack.push(this.status);
                        
                        if(!contentHandler.primitive(this.token.value)) {
                                
                                return true;
                        }
                        
                } else if(this.token.type == Yytoken.TYPE_LEFT_BRACE) {
                        
                        return this.pushStatusInObject(statusStack, contentHandler);
                        
                } else if(this.token.type == Yytoken.TYPE_LEFT_SQUARE) {
                        
                        return this.pushStatusInArray(statusStack, contentHandler);
                        
                } else {
                        
                        this.status = STATUS_IN_ERROR;
                }
                
                return false;
        }
        
        private boolean pushStatusInArray(Stack<Object> statusStack, JSONContentHandler contentHandler) throws JSONParseException, IOException {
                
                this.status = STATUS_IN_ARRAY;
                statusStack.push(this.status);
                
                if(!contentHandler.startArray()) {
                        
                        return true;
                }
                
                return false;
        }
        
        private boolean pushStatusInObject(Stack<Object> statusStack, JSONContentHandler contentHandler) throws JSONParseException, IOException {
                
                this.status = STATUS_IN_OBJECT;
                statusStack.push(this.status);
                
                if(!contentHandler.startObject()) {
                        
                        return true;
                }
                
                return false;
        }
}

RalleYTN / SimpleJSON / 46

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