maze-serval 0.6.8

Serval helps you prepare data for Maze and Trapper
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// Grammar for advanced filter expressions
// Precedence: OR (lowest) < AND (highest)
// Supports parentheses for explicit grouping

WHITESPACE = _{ " " | "\t" }

// Entry point
filter = { SOI ~ or_expr ~ EOI }

// OR expression (lowest precedence)
or_expr = { and_expr ~ (or_op ~ and_expr)* }
or_op = { ^"or" }

// AND expression (higher precedence)
and_expr = { primary ~ (and_op ~ primary)* }
and_op = { ^"and" }

// Primary: either a parenthesized expression or a condition
primary = { paren_expr | condition }
paren_expr = { "(" ~ or_expr ~ ")" }

// Condition: field:value
condition = { field ~ ":" ~ value }

// Field names and aliases
field = {
    ^"species" | ^"sp" | ^"s" |
    ^"individual" | ^"ind" | ^"i" |
    ^"rating" | ^"rate" | ^"r" |
    ^"path" | ^"p" |
    ^"event" | ^"e" |
    ^"custom" | ^"c"
}

// Value: can be quoted or unquoted, supports operators
value = { quoted_value | unquoted_value }

// Quoted value (preserves spaces and special chars)
quoted_value = @{ ("\"" ~ quoted_inner ~ "\"") | ("'" ~ quoted_inner_single ~ "'") }
quoted_inner = { (!("\"") ~ ANY)* }
quoted_inner_single = { (!("'") ~ ANY)* }

// Unquoted value: continues until we hit a logical operator or closing paren
// This allows multi-word values like "Tibetan fox" without quotes
unquoted_value = @{
    (
        !(")" | ^" and " | ^" or " | EOI) ~ ANY
    )+
}