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-- Copyright 2015-2016 Alejandro Baez (https://twitter.com/a_baez). See LICENSE.
-- Rust LPeg lexer.
local l = require("lexer")
local token, word_match = l.token, l.word_match
local P, R, S = lpeg.P, lpeg.R, lpeg.S
local M = {_NAME = 'rust'}
-- Whitespace.
local ws = token(l.WHITESPACE, l.space^1)
-- Comments.
local line_comment = '//' * l.nonnewline_esc^0
local block_comment = '/*' * (l.any - '*/')^0 * P('*/')^-1
local comment = token(l.COMMENT, line_comment + block_comment)
-- Strings.
local sq_str = P('L')^-1 * l.delimited_range("'")
local dq_str = P('L')^-1 * l.delimited_range('"')
local raw_str = "##" * (l.any - '##')^0 * P("##")^-1
local string = token(l.STRING, dq_str + raw_str)
-- Numbers.
local number = token(l.NUMBER, l.float +
"0b" * (l.dec_num + "_")^1 + l.integer)
-- Keywords.
local keyword = token(l.KEYWORD, word_match{
'abstract', 'alignof', 'as', 'become', 'box',
'break', 'const', 'continue', 'crate', 'do',
'else', 'enum', 'extern', 'false', 'final',
'fn', 'for', 'if', 'impl', 'in',
'let', 'loop', 'macro', 'match', 'mod',
'move', 'mut', "offsetof", 'override', 'priv',
'pub', 'pure', 'ref', 'return', 'sizeof',
'static', 'self', 'struct', 'super', 'true',
'trait', 'type', 'typeof', 'unsafe', 'unsized',
'use', 'virtual', 'where', 'while', 'yield'
})
-- Library types
local library = token(l.LABEL, l.upper * (l.lower + l.dec_num)^1)
-- syntax extensions
local extension = l.word^1 * S("!")
local func = token(l.FUNCTION, extension)
-- Types.
local type = token(l.TYPE, word_match{
'()', 'bool', 'isize', 'usize', 'char', 'str',
'u8', 'u16', 'u32', 'u64', 'i8', 'i16', 'i32', 'i64',
'f32','f64',
})
-- Identifiers.
local identifier = token(l.IDENTIFIER, l.word)
-- Operators.
local operator = token(l.OPERATOR, S('+-/*%<>!=`^~@&|?#~:;,.()[]{}'))
-- Attributes.
local attribute = token(l.PREPROCESSOR, "#[" *
(l.nonnewline - ']')^0 * P("]")^-1)
M._rules = {
{'whitespace', ws},
{'keyword', keyword},
{'function', func},
{'library', library},
{'type', type},
{'identifier', identifier},
{'string', string},
{'comment', comment},
{'number', number},
{'operator', operator},
{'preprocessor', attribute},
}
M._foldsymbols = {
_patterns = {'%l+', '[{}]', '/%*', '%*/', '//'},
[l.COMMENT] = {['/*'] = 1, ['*/'] = -1, ['//'] = l.fold_line_comments('//')},
[l.OPERATOR] = {['('] = 1, ['{'] = 1, [')'] = -1, ['}'] = -1}
}
return M
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