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Concrete-syntax

Lexer

An executable lexer of Yul.

This is a simple lexer for the Yul lexical grammar. The grammar is defined in ABNF. See grammar.

The primary API for lexing Yul is lexemeize-yul and lexemeize-yul-bytes.

The lexer is defined in three sections:

Generation of specialized generator macros for this lexer.
Table of lexing functions for groups, options, and repetitions that occur internally to Yul grammar rules.
Definitions of lexing functions, most of which are just calls to macros that generate the functions, but some of which are hand-written due to limitations in the current parser generators.

Subtopics

Lex-keyword: Parse a keyword.
Lex-group-escape-sequence-single: Parse a ( squote / dquote / %s"\" / %s"n" / %s"r" / %s"t" / lf / cr ).
Lex-symbol: Parse a symbol.
Lex-rest-of-block-comment-fns: Mutually recursive part of block comment lexing.
Lex-group-for-hex-string: Parse a ( dquote [ 2hex-digit *( [ "_" ] 2hex-digit ) ] dquote / squote [ 2hex-digit *( [ "_" ] 2hex-digit ) ] squote ).
Lex-hex-digit: Parse a hex-digit.
Lex-group-escape-sequence-body: Parse a ( ( squote / dquote / %s"\" / %s"n" / %s"r" / %s"t" / lf / cr ) / %s"u" 4hex-digit / %s"x" 2hex-digit ).
Lex-whitespace-char: Parse a whitespace-char.
Lex-string-literal: Parse a string-literal.
Lex-literal: Parse a literal.
Lex-identifier-start: Parse a identifier-start.
Lex-hex-string: Parse a hex-string.
Lex-single-quoted-printable: Parse a single-quoted-printable.
Lex-double-quoted-printable: Parse a double-quoted-printable.
Lex-group-optional-underbar-and-two-hex-digits: Parse a ( [ "_" ] 2hex-digit ).
Lex-escape-sequence: Parse a escape-sequence.
Lex-token: Parse a token.
Lex-not-star-or-slash: Parse a not-star-or-slash.
Lex-not-lf-or-cr: Parse a not-lf-or-cr.
Lex-group-squoted-or-escape: Parse a ( single-quoted-printable / escape-sequence ).
Lex-group-dquoted-or-escape: Parse a ( double-quoted-printable / escape-sequence ).
Lex-optional-sequence-of-2hex-digits: Parse a [ 2hex-digit *( [ "_" ] 2hex-digit ) ].
Lex-decimal-number: Parse a decimal-number.
Lex-lexeme: Parse a lexeme.
Lex-identifier-rest: Parse a identifier-rest.
Lex-end-of-line-comment: Parse a end-of-line-comment.
Lex-nonzero-decimal-digit: Parse a nonzero-decimal-digit.
Lex-repetition-*-optional-underbar-and-two-hex-digits: Parse a *( [ "_" ] 2hex-digit ).
Lex-not-star: Parse a not-star.
Lex-comment: Parse a comment.
Lex-boolean: Parse a boolean.
Lex-block-comment: Parse a block-comment.
Lex-uppercase-letter: Parse a uppercase-letter.
Lex-lowercase-letter: Parse a lowercase-letter.
Lex-identifier: Parse a identifier.
Lex-hex-number: Parse a hex-number.
Lex-decimal-digit: Parse a decimal-digit.
Lex-squote: Parse a squote.
Lex-repetition-4-hex-digits: Lex exactly 4 hexadecimal digits.
Lex-optional-underbar: Parse a [ "_" ].
Lex-dquote: Parse a dquote.
Lex-repetition-*-squoted-or-escape: Parse a *( single-quoted-printable / escape-sequence ).
Lex-repetition-*-dquoted-or-escape: Parse a *( double-quoted-printable / escape-sequence ).
Lex-repetition-*-whitespace-char: Parse a *whitespace-char.
Lex-repetition-*-identifier-rest: Parse a *identifier-rest.
Lex-repetition-2-hex-digits: Lex exactly 2 hexadecimal digits.
Lex-lf: Parse a lf.
Lex-cr: Parse a cr.
Lex-repetition-*-not-lf-or-cr: Parse a *not-lf-or-cr.
Lex-repetition-*-decimal-digit: Parse a *decimal-digit.
Lexemeize-yul: Lexes the bytes of yul-string into a list of lexemes.
Lex-repetition-*-lexeme: Parse a *lexeme.
Lex-repetition-*-hex-digit: Parse a *hex-digit.
*defparse-yul-group-table*: Table of group parsing functions.
Lex-whitespace: Lex rule whitespace = 1*whitespace-char.
Lexemeize-yul-bytes: Lexes the bytes into a list of lexemes.
*defparse-yul-repetition-table*: Table of repetition parsing functions.
*defparse-yul-option-table*: Table of option parsing functions.