scan-number ( -- number )
Factor handbook » The language » Parsing words » Reading ahead

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Vocabulary
parser

Inputs
None

Outputs

number

a number

Word description
Reads the next token from parser input. If the token is a number literal, it is converted to a number. Otherwise, it throws an error.

Errors
Throws an error if the token is not a number or end of file is reached.

Notes
This word should only be called from parsing words.

Definition

USING: lexer ;

IN: parser

: scan-number ( -- number ) ?scan-token parse-number ;