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A SAX push parser implementation which converts a serialized JSON text into
A一个 SAX push parser implementation which converts a serialized JSON text into推送式解析器实现，它将序列化的 JSON 文本转换
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<<ref_basic_parser>>
<<ref_basic_parser>>&lt;&gt;
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Description
Description描述
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Name
Name一个 SAX 推送式解析器实现，它将序列化的 JSON 文本转换为对用户提供的处理器的一系列成员函数调用，从而允许自定义内存中文档的表示行为。
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= Parsing Parsing is the process where a serialized JSON text is validated and decomposed into elements. The library provides these functions and types to assist with parsing:
= Parsing Parsing is the process where a serialized JSON text is validated and decomposed into elements. The library provides these functions and types to assist with parsing:解析 解析是将序列化的JSON文本验证并分解为元素的过程。该库提供以下函数和类型来辅助解析：
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File “doc/pages/io/parsing_zh_Hans.adoc” was added. 06/05/2026
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Users who wish to implement custom parsing strategies may create their own handler to use with an instance of <<ref_basic_parser>>. The handler implements the function signatures required by SAX event interface. In <<examples_validate>> example we define the "null" parser, which throws out the parsed results, to use in the implementation of a function that determines if a JSON text is valid.
Users who wish to implement custom parsing strategies may create their own handler to use with an instance of <<ref_basic_parser>>. The handler implements the function signatures required by SAX event interface. In <<examples_validate>> example we define the "null" parser, which throws out the parsed results, to use in the implementation of a function that determines if a JSON text is valid.
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Custom Parsers
Custom Parsers
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Through careful specification of buffers and memory resources, it is possible to eliminate all dynamic allocation completely when parsing JSON, for the case where the entire JSON text is available in a single character buffer, as shown here:
Through careful specification of buffers and memory resources, it is possible to eliminate all dynamic allocation completely when parsing JSON, for the case where the entire JSON text is available in a single character buffer, as shown here:
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Avoiding Dynamic Allocations
Avoiding Dynamic Allocations
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To achieve performance and memory efficiency, the parser uses a temporary storage area to hold intermediate results. This storage is reused when parsing more than one JSON text, reducing the total number of calls to allocate memory and thus improving performance. Upon construction, the memory resource used to perform allocations for this temporary storage area may be specified. Otherwise, the default memory resource is used. In addition to a memory resource, the parser can make use of a caller-owned buffer for temporary storage. This can help avoid dynamic allocations for small inputs. The following example uses a four kilobyte temporary buffer for the parser, and falls back to the default memory resource if needed:
To achieve performance and memory efficiency, the parser uses a temporary storage area to hold intermediate results. This storage is reused when parsing more than one JSON text, reducing the total number of calls to allocate memory and thus improving performance. Upon construction, the memory resource used to perform allocations for this temporary storage area may be specified. Otherwise, the default memory resource is used. In addition to a memory resource, the parser can make use of a caller-owned buffer for temporary storage. This can help avoid dynamic allocations for small inputs. The following example uses a four kilobyte temporary buffer for the parser, and falls back to the default memory resource if needed:
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After default construction, or after <<ref_stream_parser_reset>> is called with no arguments, the <<ref_value>> produced after a successful parse operation uses the default memory resource. To use a different memory resource, call `reset` with the resource to use. Here we use a <<ref_monotonic_resource>>, which is optimized for parsing but not subsequent modification:
After default construction, or after <<ref_stream_parser_reset>> is called with no arguments, the <<ref_value>> produced after a successful parse operation uses the default memory resource. To use a different memory resource, call `reset` with the resource to use. Here we use a <<ref_monotonic_resource>>, which is optimized for parsing but not subsequent modification:
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Controlling Memory
Controlling Memory
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We can complicate the example further by extracting _several_ JSON values from the sequence of lines.
We can complicate the example further by extracting _several_ JSON values from the sequence of lines.
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`std::getline` use (see the warning in <<non_standard_json>> section).
`std::getline` use (see the warning in <<non_standard_json>> section).
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This example will break, if comments are enabled, because of
This example will break, if comments are enabled, because of
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In the following example a JSON text is parsed from standard input a line at a time. Error codes are used instead. The function <<ref_stream_parser_finish>> is used to indicate the end of the input:
In the following example a JSON text is parsed from standard input a line at a time. Error codes are used instead. The function <<ref_stream_parser_finish>> is used to indicate the end of the input:
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To use the <<ref_stream_parser>>, declare an instance. Then call <<ref_stream_parser_write>> zero or more times with successive buffers representing the input JSON. When there are no more buffers, call <<ref_stream_parser_finish>>. The function <<ref_stream_parser_done>> returns `true` after a successful call to `write` or `finish` if parsing is complete.
To use the <<ref_stream_parser>>, declare an instance. Then call <<ref_stream_parser_write>> zero or more times with successive buffers representing the input JSON. When there are no more buffers, call <<ref_stream_parser_finish>>. The function <<ref_stream_parser_done>> returns `true` after a successful call to `write` or `finish` if parsing is complete.
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Less total memory is required to process the full input
Less total memory is required to process the full input
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Jitter, unfairness, and latency is reduced
Jitter, unfairness, and latency is reduced
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