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• JsonReceiver.java

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net.sf.saxon.ma.json.JsonReceiver Maven / Gradle / Ivy

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2018-2023 Saxonica Limited
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is "Incompatible With Secondary Licenses", as defined by the Mozilla Public License, v. 2.0.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

package net.sf.saxon.ma.json;

import net.sf.saxon.event.PipelineConfiguration;
import net.sf.saxon.event.Receiver;
import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.functions.SystemFunction;
import net.sf.saxon.om.*;
import net.sf.saxon.s9api.Location;
import net.sf.saxon.str.*;
import net.sf.saxon.trans.Err;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.type.SchemaType;
import net.sf.saxon.type.StringConverter;
import net.sf.saxon.value.DoubleValue;
import net.sf.saxon.value.StringToDouble11;
import net.sf.saxon.value.StringValue;
import net.sf.saxon.value.Whitespace;

import java.util.HashSet;
import java.util.Objects;
import java.util.Set;
import java.util.Stack;
import java.util.function.IntPredicate;

/**
 * A Receiver which receives a stream of XML events using the vocabulary defined for the XML representation
 * of JSON in XSLT 3.0, and which generates the corresponding JSON text as a string
 */


public class JsonReceiver implements Receiver {
    private XPathContext context;
    private PipelineConfiguration pipe;
    private UniStringConsumer output;
    private final StringBuilder textBuffer = new StringBuilder(128);
    private final Stack stack = new Stack<>();
    private boolean atStart = true;
    private boolean indenting = false;
    private boolean escaped = false;
    private final Stack> keyChecker = new Stack<>();
    private FunctionItem numberFormatter = null;
    private static final String ERR_INPUT = "FOJS0006";

    public JsonReceiver(PipelineConfiguration pipe, XPathContext context, UniStringConsumer output) {
        Objects.requireNonNull(pipe);
        Objects.requireNonNull(output);
        setPipelineConfiguration(pipe);
        this.output = output;
        this.context = context;
    }

    @Override
    public void setPipelineConfiguration(PipelineConfiguration pipe) {
        this.pipe = pipe;
    }

    @Override
    public PipelineConfiguration getPipelineConfiguration() {
        return pipe;
    }

    @Override
    public void setSystemId(String systemId) {
        // no action
    }

    public void setIndenting(boolean indenting) {
        this.indenting = indenting;
    }

    public boolean isIndenting() {
        return indenting;
    }

    public void setNumberFormatter(FunctionItem formatter) {
        assert formatter.getArity() == 1;
        this.numberFormatter = formatter;
    }

    public FunctionItem getNumberFormatter() {
        return this.numberFormatter;
    }

    @Override
    public void open() throws XPathException {
        output.open();
    }

    @Override
    public void startDocument(int properties) throws XPathException {
//        if (output == null) {
//            output = new StringBuilder(2048);
//        }
    }

    @Override
    public void endDocument() throws XPathException {
        // no action
    }

    @Override
    public void setUnparsedEntity(String name, String systemID, String publicID) throws XPathException {
        // no action
    }

    @Override
    public void startElement(NodeName elemName, SchemaType type,
                             AttributeMap attributes, NamespaceMap namespaces,
                             Location location, int properties) throws XPathException {
        String parent = stack.empty() ? null : stack.peek().getLocalPart();
        boolean inMap = "map".equals(parent) || stack.isEmpty();
        stack.push(elemName);
        //started.push(false);
        if (!elemName.hasURI(NamespaceUri.FN)) {
            throw new XPathException("xml-to-json: element found in wrong namespace: " +
                                             elemName.getStructuredQName().getEQName(), ERR_INPUT);
        }

        String key = null;
        String escapedAtt = null;
        String escapedKey = null;
        for (AttributeInfo att : attributes) {
            NodeName attName = att.getNodeName();
            if (attName.hasURI(NamespaceUri.NULL)) {
                switch (attName.getLocalPart()) {
                    case "key":
                        if (!inMap) {
                            throw new XPathException(
                                    "xml-to-json: The key attribute is allowed only on elements within a map", ERR_INPUT);
                        }
                        key = att.getValue();
                        break;
                    case "escaped-key":
                        if (!inMap) {
                            throw new XPathException(
                                    "xml-to-json: The escaped-key attribute is allowed only on elements within a map", ERR_INPUT);
                        }
                        escapedKey = att.getValue();
                        break;
                    case "escaped":
                        boolean allowed = stack.size() == 1 || elemName.getLocalPart().equals("string");
                        // See bugs 29917 and 30077: at the top level, the escaped attribute is ignored
                        // whatever element it appears on
                        if (!allowed) {
                            throw new XPathException(
                                    "xml-to-json: The escaped attribute is allowed only on the  element",
                                    ERR_INPUT);
                        }
                        escapedAtt = att.getValue();
                        break;
                    default:
                        throw new XPathException("xml-to-json: Disallowed attribute in input: " + attName.getDisplayName(), ERR_INPUT);
                }
            } else if (attName.hasURI(NamespaceUri.FN)) {
                throw new XPathException("xml-to-json: Disallowed attribute in input: " + attName.getDisplayName(), ERR_INPUT);
            }
            // Attributes in other namespaces are ignored
        }

        if (!atStart) {
            output.accept(BMPString.of(","));
            if (indenting) {
                indent(stack.size());
            }
        }
        if (inMap && !keyChecker.isEmpty()) {
            if (key == null) {
                throw new XPathException("xml-to-json: Child elements of