81 lines
3.4 KiB
Lua
Executable File
81 lines
3.4 KiB
Lua
Executable File
-- Copyright 2006-2019 Mitchell mitchell.att.foicica.com. See License.txt.
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-- Scheme LPeg lexer.
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local lexer = require('lexer')
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local token, word_match = lexer.token, lexer.word_match
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local P, R, S = lpeg.P, lpeg.R, lpeg.S
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local lex = lexer.new('scheme')
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-- Whitespace.
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lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
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-- Keywords.
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lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
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and begin case cond cond-expand define define-macro delay do else fluid-let if
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lambda let let* letrec or quasiquote quote set!
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]]))
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-- Functions.
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lex:add_rule('function', token(lexer.FUNCTION, word_match[[
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abs acos angle append apply asin assoc assq assv atan car cdr caar cadr cdar
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cddr caaar caadr cadar caddr cdaar cdadr cddar cdddr
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call-with-current-continuation call-with-input-file call-with-output-file
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call-with-values call/cc catch ceiling char->integer char-downcase char-upcase
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close-input-port close-output-port cons cos current-input-port
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current-output-port delete-file display dynamic-wind eval exit exact->inexact
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exp expt file-or-directory-modify-seconds floor force for-each gcd gensym
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get-output-string getenv imag-part integer->char lcm length list list->string
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list->vector list-ref list-tail load log magnitude make-polar make-rectangular
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make-string make-vector map max member memq memv min modulo newline nil not
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number->string open-input-file open-input-string open-output-file
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open-output-string peek-char quotient read read-char read-line real-part
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remainder reverse reverse! round set-car! set-cdr! sin sqrt string
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string->list string->number string->symbol string-append string-copy
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string-fill! string-length string-ref string-set! substring symbol->string
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system tan truncate values vector vector->list vector-fill! vector-length
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vector-ref vector-set! with-input-from-file with-output-to-file write
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write-char
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boolean? char-alphabetic? char-ci<=? char-ci<? char-ci=? char-ci>=? char-ci>?
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char-lower-case? char-numeric? char-ready? char-upper-case? char-whitespace?
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char<=? char<? char=? char>=? char>? char? complex? eof-object? eq? equal?
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eqv? even? exact? file-exists? inexact? input-port? integer? list? negative?
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null? number? odd? output-port? pair? port? positive? procedure? rational?
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real? string-ci<=? string-ci<? string-ci=? string-ci>=? string-ci>? string<=?
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string<? string=? string>=? string>? string? symbol? vector? zero?
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#t #f
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]]))
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local word = (lexer.alpha + S('-!?')) * (lexer.alnum + S('-!?'))^0
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-- Identifiers.
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lex:add_rule('identifier', token(lexer.IDENTIFIER, word))
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-- Strings.
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local literal = (P("'") + '#' * S('\\bdox')) * lexer.word
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local dq_str = lexer.delimited_range('"')
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lex:add_rule('string', token(lexer.STRING, literal + dq_str))
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-- Comments.
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local line_comment = ';' * lexer.nonnewline^0
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local block_comment = '#|' * (lexer.any - '|#')^0 * P('|#')^-1
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lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))
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-- Numbers.
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lex:add_rule('number', token(lexer.NUMBER, P('-')^-1 * lexer.digit^1 *
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(S('./') * lexer.digit^1)^-1))
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-- Operators.
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lex:add_rule('operator', token(lexer.OPERATOR, S('<>=*/+-`@%:()')))
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-- Entity.
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lex:add_rule('entity', token('entity', '&' * word))
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lex:add_style('entity', lexer.STYLE_VARIABLE)
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-- Fold points.
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lex:add_fold_point(lexer.OPERATOR, '(', ')')
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lex:add_fold_point(lexer.COMMENT, '#|', '|#')
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lex:add_fold_point(lexer.COMMENT, ';', lexer.fold_line_comments(';'))
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return lex
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