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title: "Parser"
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sidebar_label: "Parser"
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# Parser
## Introduction
Generic parser that is used to register keywords and a corresponding function that will be executed when that
keyword is encountered in the command stream (either from plugins or via streaming)
To use a parser do the following:
1. Define a structure that will be used to share user state across calls (user defined `void *user`)
2. Initialize the parser using `parser_init`
3. Register keywords with their associated callback function using `parser_add_keyword`
4. Start a loop for as long there is input (or parser_action returns error)
1. Fetch the next line using `parser_next` (if needed)
2. Process the line using `parser_action`
5. Release the parser using `parser_destroy`
6. Release the user structure
See examples in receiver.c / pluginsd_parser.c
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