Analyzer

Lexical analyzer created from regular expressions

About

Analyzer is a token recognition oriented lexical analyzer using regular expressions to check the rules of assigned grammatical structures.

Successful expression

Unsuccessful expression

Grammar

id + id - id = id + id - id / id

"id" represents alphanumeric values including decimals.

Expressions

Reserved words

• int
• flo
• dou
• boo
• str
• pub
• class
• print
• true
• false

Operations

• "=="
• ">="
• "<="
• "!="
• "="
• "!"
• ">"
• "<"
• "+"
• "-"
• "/"
• "%"
• "&&"
• "*"
• ";"

Numbers

Reals and decimals

Lexical rules

• An identifier cannot be called as a reserved word.
• Expressions must end with a semicolon. (;)
• Expressions cannot be put after the semicolon.
• Identifiers cannot have numbers or special symbols.
• Identifiers must be defined after their data type.
• Identifiers must have at least one separating space with respect to their data type.
• Operation expressions must be defined with only identifiers or numbers.
• Odd operations cannot be performed on an expression.

Lexical analyzer process