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mirror of synced 2025-02-23 21:43:41 +01:00
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Rename preamble to header

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This commit is contained in:
Stepland 2020-06-08 23:00:06 +02:00
parent b48550d828
commit 4dbecf0a79
1 changed files with 20 additions and 6 deletions
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26
jubeatools/formats/memo/preamble.py → jubeatools/formats/memo/header.py
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@ -1,13 +1,13 @@
""" """
Useful things to parse the preamble of analyser-like formats Useful things to parse the header of analyser-like formats
""" """
from decimal import Decimal from decimal import Decimal
from typing import List, Tuple, Union from typing import List, Tuple, Union, Iterable
from parsimonious import Grammar, NodeVisitor from parsimonious import Grammar, NodeVisitor
from parsimonious.expressions import Node from parsimonious.expressions import Node
preamble_line_grammar = Grammar( header_line_grammar = Grammar(
r""" r"""
raw_line = line comment? raw_line = line comment?
line = command? ws line = command? ws
@ -26,7 +26,7 @@ preamble_line_grammar = Grammar(
) )
class PreambleLineVisitor(NodeVisitor): class HeaderLineVisitor(NodeVisitor):
"""Returns a (key, value) tuple or None if the line contains no useful """Returns a (key, value) tuple or None if the line contains no useful
information for the parser (a comment or an empty line)""" information for the parser (a comment or an empty line)"""
@ -72,8 +72,22 @@ class PreambleLineVisitor(NodeVisitor):
return visited_children or node return visited_children or node
_preamble_line_visitor = PreambleLineVisitor() _header_line_visitor = HeaderLineVisitor()
def load_preamble_line(line: str) -> Union[Tuple[str, Union[str, Decimal]], None]: def load_preamble_line(line: str) -> Union[Tuple[str, Union[str, Decimal]], None]:
_preamble_line_visitor.visit(preamble_line_grammar.parse(line)) _header_line_visitor.visit(header_line_grammar.parse(line))
def first_non_header_line(lines: Iterable[str]) -> int:
"""Return the index of the first line on the iterable which does not
parse correctly as header line"""
res = 0
for line in lines:
try:
header_line_grammar.parse(line)
except Exception:
break
else:
res += 1
return res