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In the old implementation each variable in an expression would be parsed
up to three times:
* Try to parse a path because it contains a leading double colon, or
infix double colons.
* Try to parse it as path again by scanning for an identifier that
contains an upper case character.
* Fall back to scanning for any identifier.
This PR turns all three steps into one, without the need for
backtracking.
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This change
* allows using empty arrays `[]` in expessions,
* adds a cut when the leading `[` was encountered, and
* fixes the interaction between arrays and boolean OR.
IMO the restriction that you couldn't use empty arrays is not needed.
The missing cut made error messages slictly worse if you forget to add
the closing `]`.
Filter expressions must not have white spaces before the pipe `|`. The
white space is used to tell a filter expressions, and `std::ops::Or`
apart.
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This change:
* adds a cut when the leading `(` was encountered, and
* fixed the interaction between call expressions and boolean OR.
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`parser.rs` was a single file containing almost 2000 lines.
This PR split the file into multiple, smaller files. `Expr`, `Node`, and
`Target` each get an own file. Each struct gets a `parse()` method that
return `Result<Self>`, and every other detail is private to the file.
This PR should make this essential part of Askama more easy to
understand, and make future modifications easier.
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