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from functools import reduce
try:
from funcparserlib.lexer import make_tokenizer
from funcparserlib.parser import (
some, maybe, many, finished, skip, NoParseError)
except ImportError as e:
print("Missing funcparserlib library. You need to install the 'parser' extra dependency set.")
raise e
from pyinflux import client
def parse_lines(lines: str):
"""
Parse multiple Write objects separeted by new-line character.
"""
writes = map(LineParser.parse, lines.split("\n"))
return list(writes)
class LineTokenizer:
specs = [
('Comma', (r',',)),
('Space', (r' ',)),
('Equal', (r'=',)),
('Quote', (r'"',)),
('Escape', (r'\\',)),
('Int', (r'[0-9]+(?![0-9\.])',)),
('Float', (r'-?(\.[0-9]+)|([0-9]+(\.[0-9]*)?)',)),
('Char', (r'.',)),
]
@classmethod
def tokenize(klass, line: str):
tokenizer = make_tokenizer(klass.specs)
return list(tokenizer(line))
class LineParser:
@staticmethod
def parse_identifier(line: str):
"""Parses just the identifer (first element) of the write"""
tokval = lambda t: t.value
joinval = "".join
someToken = lambda type: some(lambda t: t.type == type)
char = someToken('Char') >> tokval
space = someToken('Space') >> tokval
comma = someToken('Comma') >> tokval
quote = someToken('Quote') >> tokval
escape = someToken('Escape') >> tokval
equal = someToken('Equal') >> tokval
escape_space = skip(escape) + space >> joinval
escape_comma = skip(escape) + comma >> joinval
escape_equal = skip(escape) + equal >> joinval
escape_escape = skip(escape) + escape >> joinval
plain_int_text = someToken('Int') >> tokval
plain_float_text = someToken('Float') >> tokval
identifier = many(char | plain_float_text | plain_int_text |
escape_space | escape_comma | escape_equal |
escape_escape | plain_int_text | quote) >> joinval
toplevel = identifier >> (lambda x: x)
parsed = toplevel.parse(LineTokenizer.tokenize(line))
if len(parsed) == 0:
raise NoParseError('parsed nothing')
else:
return parsed
@staticmethod
def parse(line: str):
"""
Parse a line from the POST request into a Write object.
"""
tokval = lambda t: t.value
joinval = "".join
someToken = lambda type: some(lambda t: t.type == type)
someCharValue = lambda string: \
reduce(lambda a, b: a + b,
map(lambda char:
some(lambda t: t.value == char) >> tokval,
string)) >> joinval
char = someToken('Char') >> tokval
space = someToken('Space') >> tokval
comma = someToken('Comma') >> tokval
quote = someToken('Quote') >> tokval
escape = someToken('Escape') >> tokval
equal = someToken('Equal') >> tokval
true_value = (someCharValue("true") | someCharValue("t") |
someCharValue("True") | someCharValue("TRUE") | someCharValue("T"))
false_value = (someCharValue("false") | someCharValue("f") |
someCharValue("False") | someCharValue("FALSE") | someCharValue("F"))
escape_space = skip(escape) + space >> joinval
escape_comma = skip(escape) + comma >> joinval
escape_equal = skip(escape) + equal >> joinval
escape_quote = skip(escape) + quote >> joinval
escape_escape = skip(escape) + escape >> joinval
plain_int_text = someToken('Int') >> tokval
plain_int = plain_int_text >> (lambda v: int(v))
plain_float_text = someToken('Float') >> tokval
plain_float = plain_float_text >> (lambda v: float(v))
identifier = many(char | plain_float_text | plain_int_text |
escape_space | escape_comma | escape_equal |
escape_escape | plain_int_text | quote) >> joinval
quoted_text_ = many(escape_escape | escape_quote | space |
plain_int_text | plain_float_text | char | comma |
escape) >> joinval
quoted_text = skip(quote) + quoted_text_ + skip(quote)
unquoted_text = many(escape_space | escape_comma |
escape_equal | escape_escape |
plain_int_text | char | quote) >> joinval
boolean_value = (true_value >> (lambda s: True)
| false_value >> (lambda s: False))
kv_value = plain_int | plain_float | quoted_text | boolean_value
kv = (quoted_text | unquoted_text) + skip(equal) + kv_value >> \
(lambda x: (x[0], x[1]))
tag = identifier + skip(equal) + identifier >> (lambda x: (x[0], x[1]))
def setter(obj, property):
def r(val):
setattr(obj, property, val)
return (property, val)
return r
tags = many(skip(comma) + tag) >> (lambda x: x)
fields = (kv + many(skip(comma) + kv)) >> \
(lambda x: [x[0]] + x[1])
write = client.Line(None, None, None, None)
toplevel = (identifier >> setter(write, "key")) + \
maybe(tags >> setter(write, "tags")) + \
(skip(space) + (fields >> setter(write, "fields"))) + \
maybe(skip(space) + plain_int >> setter(write, "timestamp")) + \
skip(finished) >> (lambda x: x)
result = toplevel.parse(LineTokenizer.tokenize(line))
# pprint(result)
return write
|
