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(* This Source Code Form is subject to the terms of the Mozilla Public License,
v. 2.0. If a copy of the MPL was not distributed with this file, You can
obtain one at https://mozilla.org/MPL/2.0/. *)
import cstdio, common
const
CHUNK_SIZE := 85536u
type
ElnaLexerState = (
start,
colon,
identifier,
decimal,
leading_zero,
greater,
minus,
left_paren,
less,
dot,
comment,
closing_comment,
character,
character_escape,
string,
string_escape,
number_sign,
trait,
finish
)
ElnaLexerToken* = record
kind: ElnaLexerKind
end
ElnaLexerBooleanToken* = record(ElnaLexerToken)
value: Bool
end
ElnaLexerCharacterToken* = record(ElnaLexerToken)
value: Char
end
ElnaLexerStringToken* = record(ElnaLexerToken)
value: String
end
ElnaLexerIntegerToken* = record(ElnaLexerToken)
value: Int
end
TransitionAction = proc(lexer: ^Lexer; token: ^ElnaLexerToken)
ElnaLexerTransition = record
action: TransitionAction;
next_state: ElnaLexerState
end
BufferPosition* = record
iterator: ^Char;
location: TextLocation
end
Lexer* = record
input: ^FILE;
buffer: ^Char;
size: Word;
length: Word;
start: BufferPosition;
current: BufferPosition
end
ElnaLexerKind* = (
identifier,
_const,
_var,
_proc,
_type,
_begin,
_end,
_if,
_then,
_else,
_elsif,
_extern,
_record,
boolean,
null,
and,
_or,
_xor,
not,
_return,
_cast,
trait,
left_paren,
right_paren,
left_square,
right_square,
greater_equal,
less_equal,
greater_than,
less_than,
not_equal,
equals,
semicolon,
dot,
comma,
plus,
_import,
minus,
multiplication,
division,
remainder,
assignment,
colon,
hat,
at,
comment,
string,
character,
integer,
word,
_while,
_defer,
exclamation,
shift_right,
shift_left,
pipe,
_case,
_do,
_of,
eof
)
(**
* Classification table assigns each possible character to a group (class). All
* characters of the same group a handled equivalently.
*)
ElnaLexerClass = (
invalid,
digit,
alpha,
space,
colon,
equals,
left_paren,
right_paren,
asterisk,
backslash,
single,
hex,
zero,
x,
eof,
dot,
minus,
single_quote,
double_quote,
greater,
less,
other,
number_sign
)
end.
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