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-- Copyright 2006-2019 Mitchell mitchell.att.foicica.com. See License.txt.
-- Pike 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('pike')
-- Whitespace.
lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
-- Keywords.
lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
break case catch continue default do else for foreach gauge if lambda return
sscanf switch while import inherit
-- Type modifiers.
constant extern final inline local nomask optional private protected public
static variant
]]))
-- Types.
lex:add_rule('type', token(lexer.TYPE, word_match[[
array class float function int mapping mixed multiset object program string
void
]]))
-- 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) +
'#' * lexer.delimited_range('"')))
-- Comments.
lex:add_rule('comment', token(lexer.COMMENT, '//' * lexer.nonnewline_esc^0 +
lexer.nested_pair('/*', '*/')))
-- Numbers.
lex:add_rule('number', token(lexer.NUMBER, (lexer.float + lexer.integer) *
S('lLdDfF')^-1))
-- Preprocessors.
lex:add_rule('preprocessor', token(lexer.PREPROCESSOR, lexer.starts_line('#') *
lexer.nonnewline^0))
-- Operators.
lex:add_rule('operator', token(lexer.OPERATOR, S('<>=!+-/*%&|^~@`.,:;()[]{}')))
-- Fold points.
lex:add_fold_point(lexer.OPERATOR, '{', '}')
lex:add_fold_point(lexer.COMMENT, '/*', '*/')
lex:add_fold_point(lexer.COMMENT, '//', lexer.fold_line_comments('//'))
return lex
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