Operators can be typed as the Advanced Search shows them, which every
locale already translates, and new keyword messages cover the join
words, "no"/"has", the units of a relative date, and the range forms.
Each range form is given as an example with its two ends filled in, so
that a locale can say it its own way and each form keeps its own words
(e.g., no "between 1970 to 2000").
"year is between 1970 and 2000", "year:1970-2000", "1970..2000", and
"1970 to 2000" all match values within the range, inclusive of both
ends. Ends can be a year, a month ("added between 2024-02 and
2024-06"), a day ("date:2020-03-01..2020-03-15"), or a count ("number
of tags between 2 and 5").
Zotero.SearchQuery turns a query like `by:smith after:2020 tag:"to read"
crispr` or `creator is smith and (tag is foo or bar)` into a
Zotero.Search, matching whatever text is left over using the current
search mode. Anything that doesn't look like a clause is free text, so a
DOI or a title with a colon in it is matched literally.
The search box syntax-highlights the parts of recognized conditions and
offers autocomplete for condition names, for the values of conditions
that have a fixed set of them (like item type), and for tags and
creators from the selected libraries.
