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118 lines
2.9 KiB
Python
118 lines
2.9 KiB
Python
"""jc - JSON CLI output utility `foo` command output streaming parser
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> This streaming parser outputs JSON Lines
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<<Short foo description and caveats>>
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Usage (cli):
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$ foo | jc --foo-s
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Usage (module):
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import jc.parsers.foo_s
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result = jc.parsers.foo_s.parse(foo_command_output.splitlines()) # result is an iterable object
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for item in result:
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# do something
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Schema:
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{
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"foo": string,
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"_jc_meta": # This object only exists if using -qq or ignore_exceptions=True
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{
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"success": booean, # true if successfully parsed, false if error
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"error": string, # exists if "success" is false
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"line": string # exists if "success" is false
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}
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}
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Examples:
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$ foo | jc --foo-s
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{example output}
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...
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$ foo | jc --foo-s -r
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{example output}
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...
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"""
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import jc.utils
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from jc.utils import stream_success, stream_error
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from jc.exceptions import ParseError
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class info():
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"""Provides parser metadata (version, author, etc.)"""
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version = '1.0'
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description = '`foo` command streaming parser'
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author = 'John Doe'
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author_email = 'johndoe@gmail.com'
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# compatible options: linux, darwin, cygwin, win32, aix, freebsd
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compatible = ['linux', 'darwin', 'cygwin', 'aix', 'freebsd']
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streaming = True
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__version__ = info.version
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def _process(proc_data):
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"""
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Final processing to conform to the schema.
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Parameters:
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proc_data: (Dictionary) raw structured data to process
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Returns:
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Dictionary. Structured data to conform to the schema.
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"""
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#
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# process the data here
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# rebuild output for added semantic information
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# use helper functions in jc.utils for int, float, bool conversions and timestamps
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#
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return proc_data
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def parse(data, raw=False, quiet=False, ignore_exceptions=False):
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"""
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Main text parsing generator function. Returns an iterator object.
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Parameters:
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data: (iterable) line-based text data to parse (e.g. sys.stdin or str.splitlines())
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raw: (boolean) output preprocessed JSON if True
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quiet: (boolean) suppress warning messages if True
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ignore_exceptions: (boolean) ignore parsing exceptions if True
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Yields:
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Dictionary. Raw or processed structured data.
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Returns:
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Iterator object
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"""
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if not quiet:
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jc.utils.compatibility(__name__, info.compatible)
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for line in data:
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try:
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output_line = {}
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#
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# parse the input here
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#
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if output_line:
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yield stream_success(output_line, ignore_exceptions) if raw else stream_success(_process(output_line), ignore_exceptions)
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else:
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raise ParseError('Not foo data')
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except Exception as e:
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yield stream_error(e, ignore_exceptions, line)
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