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-- Copyright 2006-2025 Mitchell. See LICENSE.
-- Vala LPeg lexer.
local lexer = require('lexer')
local token, word_match = lexer.token, lexer.word_match
local P, S = lpeg.P, lpeg.S
local lex = lexer.new('vala')
-- Whitespace.
lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
-- Keywords.
lex:add_rule('keyword', token(lexer.KEYWORD, word_match{
'class', 'delegate', 'enum', 'errordomain', 'interface', 'namespace', 'signal', 'struct', 'using',
-- Modifiers.
'abstract', 'const', 'dynamic', 'extern', 'inline', 'out', 'override', 'private', 'protected',
'public', 'ref', 'static', 'virtual', 'volatile', 'weak',
-- Other.
'as', 'base', 'break', 'case', 'catch', 'construct', 'continue', 'default', 'delete', 'do',
'else', 'ensures', 'finally', 'for', 'foreach', 'get', 'if', 'in', 'is', 'lock', 'new',
'requires', 'return', 'set', 'sizeof', 'switch', 'this', 'throw', 'throws', 'try', 'typeof',
'value', 'var', 'void', 'while',
-- Etc.
'null', 'true', 'false'
}))
-- Types.
lex:add_rule('type', token(lexer.TYPE, word_match{
'bool', 'char', 'double', 'float', 'int', 'int8', 'int16', 'int32', 'int64', 'long', 'short',
'size_t', 'ssize_t', 'string', 'uchar', 'uint', 'uint8', 'uint16', 'uint32', 'uint64', 'ulong',
'unichar', 'ushort'
}))
-- Identifiers.
lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
-- Strings.
local sq_str = lexer.range("'", true)
local dq_str = lexer.range('"', true)
local tq_str = lexer.range('"""')
local ml_str = '@' * lexer.range('"', false, false)
lex:add_rule('string', token(lexer.STRING, tq_str + sq_str + dq_str + ml_str))
-- Comments.
local line_comment = lexer.to_eol('//', true)
local block_comment = lexer.range('/*', '*/')
lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))
-- Numbers.
lex:add_rule('number', token(lexer.NUMBER, lexer.number * S('uUlLfFdDmM')^-1))
-- Operators.
lex:add_rule('operator', token(lexer.OPERATOR, S('+-/*%<>!=^&|?~:;.()[]{}')))
-- Fold points.
lex:add_fold_point(lexer.OPERATOR, '{', '}')
lex:add_fold_point(lexer.COMMENT, '/*', '*/')
lexer.property['scintillua.comment'] = '//'
return lex
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