lexer

Overview ¶

Package lexer implements a lexical scanner for Cypher.

Cypher introduces several lexical elements absent from SQL-family languages:

• Backtick-quoted identifiers: `My Identifier`
• Parameter syntax: $name or the legacy {name} form
• Relationship arrow tokens: -> and <-
• Variable-length range syntax inside relationship patterns: [*1..3]
• The regex-match operator: =~

The lexer is a standard one-character-lookahead scanner built on the same structure as the tsqlparser lexer: a Lexer struct with position/readPosition and a rune-at-a-time readChar/peekChar API.