66 lines
2.5 KiB
Lua
66 lines
2.5 KiB
Lua
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-- Copyright 2006-2019 Mitchell mitchell.att.foicica.com. See License.txt.
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-- Lisp 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('lisp')
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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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defclass defconstant defgeneric define-compiler-macro define-condition
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define-method-combination define-modify-macro define-setf-expander
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define-symbol-macro defmacro defmethod defpackage defparameter defsetf
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defstruct deftype defun defvar
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abort assert block break case catch ccase cerror cond ctypecase declaim
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declare do do* do-all-symbols do-external-symbols do-symbols dolist dotimes
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ecase error etypecase eval-when flet handler-bind handler-case if
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ignore-errors in-package labels lambda let let* locally loop macrolet
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multiple-value-bind proclaim prog prog* prog1 prog2 progn progv provide
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require restart-bind restart-case restart-name return return-from signal
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symbol-macrolet tagbody the throw typecase unless unwind-protect when
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with-accessors with-compilation-unit with-condition-restarts
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with-hash-table-iterator with-input-from-string with-open-file
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with-open-stream with-output-to-string with-package-iterator
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with-simple-restart with-slots with-standard-io-syntax
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t nil
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]]))
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local word = lexer.alpha * (lexer.alnum + '_' + '-')^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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lex:add_rule('string', token(lexer.STRING, "'" * word +
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lexer.delimited_range('"')))
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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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-- Entities.
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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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-- Operators.
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lex:add_rule('operator', token(lexer.OPERATOR, S('<>=*/+-`@%()')))
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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.OPERATOR, '[', ']')
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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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