Better parsing of header #27
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MrCurtis
commented
Aug 16, 2023
vcf/src/parse.rs
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| // Repeatedly match either non-comma/non-quote characters or blocks of text enclosed in | ||
| // quotes, until we can't, in which case we're either at a non-quote-enclosed comma or the | ||
| // end of the string. | ||
| let re = Regex::new(r#"(?:[^,"]+|(?:"[^"]*"))+"#).unwrap(); |
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This regex gets compiled every time the function gets called, which doesn't seem very efficient. How do I place it outside the function call so that it is only compiled once?
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Use something like lazy_static!:
https://stackoverflow.com/a/35169402
Or rust-lang/regex#709 (comment) which uses std rust. Seems like there's something in the works to compile statically actually in the regex crate which would be nice.
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Using lazy_static! seems to have done the job. Cheers.
This avoids repeatedly compiling the regex each call to parse.
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This ensures that the text from nested headers is not split on commas that are enclosed in quotes.
In particular, it ensures that this line
from the example in section 1.1 of the specs can be parsed.
Note that section 1.2 lists the comma as one of the special characters which should always be 'represented with the
capitalized percent encoding' when they are not used for their specific meaning. However, I assume this refers only to cases where they are not enclosed within quotes.