43 lines
1.3 KiB
Lua
43 lines
1.3 KiB
Lua
|
-- Copyright 2006-2019 Mitchell mitchell.att.foicica.com. See License.txt.
|
||
|
|
-- Gap LPeg lexer.
|
||
|
|
|
||
|
|
local lexer = require('lexer')
|
||
|
|
local token, word_match = lexer.token, lexer.word_match
|
||
|
|
local P, R, S = lpeg.P, lpeg.R, lpeg.S
|
||
|
|
|
||
|
|
local lex = lexer.new('gap')
|
||
|
|
|
||
|
|
-- Whitespace.
|
||
|
|
lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
|
||
|
|
|
||
|
|
-- Keywords.
|
||
|
|
lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
|
||
|
|
and break continue do elif else end fail false fi for function if in infinity
|
||
|
|
local not od or rec repeat return then true until while
|
||
|
|
]]))
|
||
|
|
|
||
|
|
-- Identifiers.
|
||
|
|
lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
|
||
|
|
|
||
|
|
-- Strings.
|
||
|
|
lex:add_rule('string', token(lexer.STRING, lexer.delimited_range("'", true) +
|
||
|
|
lexer.delimited_range('"', true)))
|
||
|
|
|
||
|
|
-- Comments.
|
||
|
|
lex:add_rule('comment', token(lexer.COMMENT, '#' * lexer.nonnewline^0))
|
||
|
|
|
||
|
|
-- Numbers.
|
||
|
|
lex:add_rule('number', token(lexer.NUMBER, lexer.digit^1 * -lexer.alpha))
|
||
|
|
|
||
|
|
-- Operators.
|
||
|
|
lex:add_rule('operator', token(lexer.OPERATOR, S('*+-,./:;<=>~^#()[]{}')))
|
||
|
|
|
||
|
|
-- Fold points.
|
||
|
|
lex:add_fold_point(lexer.KEYWORD, 'function', 'end')
|
||
|
|
lex:add_fold_point(lexer.KEYWORD, 'do', 'od')
|
||
|
|
lex:add_fold_point(lexer.KEYWORD, 'if', 'fi')
|
||
|
|
lex:add_fold_point(lexer.KEYWORD, 'repeat', 'until')
|
||
|
|
lex:add_fold_point(lexer.COMMENT, '#', lexer.fold_line_comments('#'))
|
||
|
|
|
||
|
|
return lex
|