144dd13818
Change-Id: Ib0a72355972662c6b902bca9a527be91fb3e1d17 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/164930 Tested-by: Jenkins Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
110 lines
3.4 KiB
C++
110 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#pragma once
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#include <sal/config.h>
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#include <tools/toolsdllapi.h>
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#include <rtl/string.hxx>
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#include <rtl/ustring.hxx>
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#include <string_view>
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/** Simple JSON encoder designed specifically for LibreOfficeKit purposes.
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*
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* (1) Minimal allocations/re-allocations/copying
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* (2) Small/simple JSON documents
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* (3) ascii property names
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*/
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namespace tools
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{
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class TOOLS_DLLPUBLIC JsonWriter
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{
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// Auto-closes the node.
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template <char closing> struct ScopedJsonWriterNode
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{
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JsonWriter& mrWriter;
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~ScopedJsonWriterNode() { mrWriter.endNode(closing); }
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};
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rtl_String* mpBuffer;
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char* mPos;
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int mSpaceAllocated;
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int mStartNodeCount;
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bool mbFirstFieldInNode;
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bool mbClosed; // cannot add to it anymore
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public:
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JsonWriter();
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~JsonWriter();
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[[nodiscard]] ScopedJsonWriterNode<'}'> startNode(std::string_view nodeName);
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[[nodiscard]] ScopedJsonWriterNode<']'> startArray(std::string_view nodeName);
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[[nodiscard]] ScopedJsonWriterNode<']'> startAnonArray();
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[[nodiscard]] ScopedJsonWriterNode<'}'> startStruct();
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void put(std::u16string_view pPropName, std::u16string_view rPropValue);
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void put(std::string_view pPropName, const OUString& rPropValue);
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// Assumes utf-8 property value encoding
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void put(std::string_view pPropName, std::string_view rPropValue);
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void put(std::string_view pPropName, const char* pPropVal)
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{
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put(pPropName, std::string_view(pPropVal));
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}
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template <size_t N> void put(std::string_view pPropName, const char (&pPropVal)[N])
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{
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put(pPropName, std::string_view(pPropVal, N));
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}
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template <typename N, std::enable_if_t<std::is_arithmetic_v<N>, int> = 0>
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void put(std::string_view pPropName, N n)
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{
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putLiteral(pPropName, OString::number(n));
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}
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void put(std::string_view pPropName, bool);
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void putSimpleValue(std::u16string_view rPropValue);
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/// This assumes that this data belongs at this point in the stream, and is valid, and properly encoded
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void putRaw(std::string_view);
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/** Closes the tags, and returns data.
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* After this no more document modifications may be written. */
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OString finishAndGetAsOString();
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private:
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void endNode(char closing);
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void addCommaBeforeField();
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void writeEscapedOUString(std::u16string_view rPropVal);
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void closeDocument();
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void ensureSpace(int noMoreBytesRequired);
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void ensureSpaceAndWriteNameColon(std::string_view name, int valSize);
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void putLiteral(std::string_view propName, std::string_view propValue);
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// overflow validation in debug mode
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static constexpr unsigned char JSON_WRITER_DEBUG_MARKER = 0xde;
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inline void addValidationMark()
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{
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#ifndef NDEBUG
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*(mpBuffer->buffer + mSpaceAllocated - 1) = JSON_WRITER_DEBUG_MARKER;
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#endif
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}
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inline void validate()
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{
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#ifndef NDEBUG
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unsigned char c = *(mpBuffer->buffer + mSpaceAllocated - 1);
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assert(c == JSON_WRITER_DEBUG_MARKER);
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#endif
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}
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};
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
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