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183 lines
21 KiB
XML
183 lines
21 KiB
XML
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<title id="fig-jvl-title">The same J​SON text parsed by basic_json::parse() and by json_document::parse()</title>
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<desc id="fig-jvl-title-d">The text {"port": 6379, "price": 19.90, "tags": ["eu", "a\"b"]}. Top: basic_json::parse() builds a tree: the root json value points to a std::map whose three nodes are separate heap allocations; the price is stored as the double 19.9; the tags array is a std::vector of two json values, each pointing to its own std::string. Bottom: json_document::parse() keeps the 54 bytes of source text and builds a flat index of nine 16-byte nodes in document order: object, key port, unsigned integer 6379 (the converted value is in the node), key price, float, key tags, array, string eu, and an escaped string. Keys, the float, and the plain string point back into the source text; the escaped string points into the document's buffer of decoded strings. A json_view is two pointers: one to the document and one to a node, here the array.</desc>
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<defs>
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<text class="nj-jsonview-tiny" x="658" y="420" xml:space="preserve">7</text>
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<text class="nj-jsonview-kind nj-jsonview-c-str" x="694" y="434" text-anchor="middle" xml:space="preserve">string</text>
|
||
<text class="nj-jsonview-mono nj-jsonview-xs" x="694" y="451" text-anchor="middle" xml:space="preserve">off 41</text>
|
||
<text class="nj-jsonview-mono nj-jsonview-xs" x="694" y="465" text-anchor="middle" xml:space="preserve">len 2</text>
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<path class="nj-jsonview-arr nj-jsonview-c-str" d="M694 406 C694 367 630 367 630 328" marker-end="url(#jvl-str)"/>
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<rect class="nj-jsonview-node nj-jsonview-c-dec" x="740" y="406" width="84" height="68" rx="5"/>
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<text class="nj-jsonview-tiny" x="746" y="420" xml:space="preserve">8</text>
|
||
<text class="nj-jsonview-kind nj-jsonview-c-dec" x="782" y="434" text-anchor="middle" xml:space="preserve">string</text>
|
||
<text class="nj-jsonview-mono nj-jsonview-xs" x="782" y="451" text-anchor="middle" xml:space="preserve">escaped</text>
|
||
<text class="nj-jsonview-mono nj-jsonview-xs" x="782" y="465" text-anchor="middle" xml:space="preserve">len 3</text>
|
||
<text class="nj-jsonview-note" x="773" y="568" text-anchor="middle" xml:space="preserve">decoded strings</text>
|
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<rect class="nj-jsonview-node nj-jsonview-c-dec" x="740" y="518" width="66" height="30" rx="4"/>
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||
<text class="nj-jsonview-mono" x="751" y="538" text-anchor="middle" xml:space="preserve">a</text>
|
||
<text class="nj-jsonview-mono" x="773" y="538" text-anchor="middle" xml:space="preserve">"</text>
|
||
<text class="nj-jsonview-mono" x="795" y="538" text-anchor="middle" xml:space="preserve">b</text>
|
||
<path class="nj-jsonview-arr nj-jsonview-c-dec" d="M782 474 C782 496 773 496 773 518" marker-end="url(#jvl-dec)"/>
|
||
<text class="nj-jsonview-mono nj-jsonview-sm" x="470" y="670" text-anchor="end" xml:space="preserve">json_view v = doc.root()["tags"]</text>
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<rect class="nj-jsonview-node nj-jsonview-c-struct" x="480" y="648" width="140" height="34" rx="6"/>
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<path class="nj-jsonview-sep" d="M550 648 V682"/>
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||
<text class="nj-jsonview-mono" x="515" y="670" text-anchor="middle" xml:space="preserve">doc*</text>
|
||
<text class="nj-jsonview-mono" x="585" y="670" text-anchor="middle" xml:space="preserve">node*</text>
|
||
<path class="nj-jsonview-arr nj-jsonview-c-struct" d="M515 648 L515 622" marker-end="url(#jvl-struct)"/>
|
||
<path class="nj-jsonview-arr nj-jsonview-c-struct" d="M585 648 C585 561 606 561 606 474" marker-end="url(#jvl-struct)"/>
|
||
<text class="nj-jsonview-note" x="30" y="524" xml:space="preserve">integers are converted while parsing and kept in their node;</text>
|
||
<text class="nj-jsonview-note" x="30" y="542" xml:space="preserve">floats and strings point back into the text</text>
|
||
</svg>
|