Function parse_filter 

pub fn parse_filter(
    field_str: &str,
    value_str: &str,
) -> Result<Filter, ParseError>

Parses a PostgREST filter from field and value strings.

Supports all 22+ PostgREST filter operators, quantifiers, negation, and full-text search.

Filter Syntax

• Basic: field=operator.value
• Negated: field=not.operator.value
• Quantifiers: field=operator(any).{val1,val2} or field=operator(all).{val1,val2}
• FTS: field=fts(lang).search terms
• JSON: data->key=operator.value or data->>key=operator.value

Examples

use postgrest_parser::parse_filter;

// Basic comparison
let filter = parse_filter("age", "gte.18").unwrap();
assert!(!filter.negated);

// Negation
let filter = parse_filter("status", "not.eq.deleted").unwrap();
assert!(filter.negated);

// Array containment
let filter = parse_filter("tags", "cs.{rust,postgres}").unwrap();

// Quantifier with array
let filter = parse_filter("tags", "eq(any).{rust,elixir}").unwrap();

// Full-text search
let filter = parse_filter("content", "fts(english).search term").unwrap();

// JSON path
let filter = parse_filter("data->user->name", "eq.Alice").unwrap();

// IS NULL
let filter = parse_filter("deleted_at", "is.null").unwrap();

Errors

Returns ParseError if:

• Operator is invalid or missing
• Field syntax is malformed
• Quantifier is used with incompatible operator
• Value format is invalid for the operator