util

SQL Parser Utilities

Shared utility functions for SQL parsing including character classification, identifier extraction, and keyword detection.

Values

consume_digits

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pub fn consume_digits(
  s: String,
  acc: String,
) -> #(String, String)

Consume consecutive digit characters from the start of a string. Returns the consumed digits and remaining string.

digit_chars

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pub const digit_chars: String

Valid digit characters for parsing parameter numbers.

extract_identifier

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pub fn extract_identifier(s: String) -> String

Extract a SQL identifier (table or column name) from the start of a string. Handles both regular identifiers and double-quoted identifiers like “table-name” or “schema”.“table”.

extract_last_identifier

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pub fn extract_last_identifier(s: String) -> String

Extract the last SQL identifier from a string by working backwards from the end.

identifier_chars

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pub const identifier_chars: String

Valid identifier characters for SQL column and table names

is_identifier_char

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pub fn is_identifier_char(c: String) -> Bool

Check if a character is valid in a SQL identifier (letters, digits, underscore).

is_sql_keyword

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pub fn is_sql_keyword(s: String) -> Bool

Check if a string is a SQL keyword (not a valid column name). Used to filter out false positives in column detection.

parse_int

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pub fn parse_int(s: String) -> option.Option(Int)

Parse an integer from a string, returning None for empty strings or invalid integers.

strip_string_literals

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pub fn strip_string_literals(sql: String) -> String

Remove content from single-quoted string literals to prevent false positives when parsing SQL keywords. Replaces ‘content’ with ‘’ to preserve SQL structure.