Lexing

Goal

• Convert text into tokens
• Skip whitespace and comments

Longest match

• Check two-char operators first
• ==, !=, <=, >=

Identifiers

• Start: letter or _
• Continue: letter, digit, _
• Reclassify as keyword when matched

Positions

• Record line/column at token start
• Helpful errors later

Style

• Simple loops
• Readable over clever