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//! Lexical analysis.
use std::str;
use std::fmt;
use kailua_diag::{Locale, Localize, Localized};
use string::{Name, Str};
/// A token.
#[derive(Clone, Debug, PartialEq)]
pub enum Tok {
/// A token which is distinct from all other tokens.
///
/// The lexer emits this token on an error.
Error,
/// A comment token. The parser should ignore this.
///
/// The shebang line (the first line starting with `#`) is also considered as a comment.
Comment,
/// A punctuation.
Punct(Punct),
/// A keyword.
Keyword(Keyword),
/// A number.
Num(f64),
/// A name (either an identifier or a quoted name in the meta block).
Name(Name),
/// A string (either `"string"` or `[[string]]`).
Str(Str),
/// The end of file.
///
/// A valid stream of tokens is expected to have only one EOF token at the end.
EOF,
}
impl Localize for Tok {
fn fmt_localized(&self, f: &mut fmt::Formatter, locale: Locale) -> fmt::Result {
match (&locale[..], self) {
("ko", &Tok::Error) => write!(f, "잘못된 문자"),
(_, &Tok::Error) => write!(f, "an invalid character"),
("ko", &Tok::Comment) => write!(f, "주석"),
(_, &Tok::Comment) => write!(f, "a comment"),
(_, &Tok::Punct(p)) => write!(f, "{}", Localized::new(&p, locale)),
(_, &Tok::Keyword(w)) => write!(f, "{}", Localized::new(&w, locale)),
("ko", &Tok::Num(_)) => write!(f, "숫자"),
(_, &Tok::Num(_)) => write!(f, "a number"),
("ko", &Tok::Name(_)) => write!(f, "이름"),
(_, &Tok::Name(_)) => write!(f, "a name"),
("ko", &Tok::Str(_)) => write!(f, "문자열 리터럴"),
(_, &Tok::Str(_)) => write!(f, "a string literal"),
("ko", &Tok::EOF) => write!(f, "파일의 끝"),
(_, &Tok::EOF) => write!(f, "the end of file"),
}
}
}
impl<'a> Localize for &'a Tok {
fn fmt_localized(&self, f: &mut fmt::Formatter, locale: Locale) -> fmt::Result {
(**self).fmt_localized(f, locale)
}
}
macro_rules! define_puncts {
($ty:ident |$locale:ident|: $($i:ident $t:expr, #[$m:meta])*) => (
/// A punctuation.
///
/// This includes Kailua-specific punctuations,
/// which are only generated in the meta block (marked as [M] below).
/// Some of them are also only generated after a particular Lua version
/// (marked as [5.x+] below).
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum $ty { $(#[$m] $i,)* }
impl Localize for $ty {
fn fmt_localized(&self, f: &mut fmt::Formatter, $locale: Locale) -> fmt::Result {
let text = match *self { $($ty::$i => $t,)* };
fmt::Display::fmt(text, f)
}
}
);
}
define_puncts! { Punct |locale|:
Plus "`+`", /// `+`.
Dash "`-`", /// `-`.
Star "`*`", /// `*`.
Slash "`/`", /// `/`.
Percent "`%`", /// `%`.
Caret "`^`", /// `^`.
Hash "`#`", /// `#`.
EqEq "`==`", /// `==`.
TildeEq "`~=`", /// `~=`.
LtEq "`<=`", /// `<=`.
GtEq "`>=`", /// `>=`.
Lt "`<`", /// `<`.
Gt "`>`", /// `>`.
Eq "`=`", /// `=`.
Amp "`&`", /// `&`. [5.3+]
Tilde "`~`", /// `~`. [5.3+]
Pipe "`|`", /// `|`. [5.3+ or M]
LtLt "`<<`", /// `<<`. [5.3+]
GtGt "`>>`", /// `>>`. [5.3+]
SlashSlash "`//`", /// `//`. [5.3+]
LParen "`(`", /// `(`.
RParen "`)`", /// `)`.
LBrace "`{`", /// `{`.
RBrace "`}`", /// `}`.
LBracket "`[`", /// `[`.
RBracket "`]`", /// `]`.
Semicolon "`;`", /// `;`.
Colon "`:`", /// `:`.
ColonColon "`::`", /// `::`. [5.2+]
Comma "`,`", /// `,`.
Dot "`.`", /// `.`.
DotDot "`..`", /// `..`.
DotDotDot "`...`", /// `...`.
// Kailua extensions
DashDashHash "`--#`", /// `--#`. [M]
DashDashV "`--v`", /// `--v`. [M]
DashDashColon "`--:`", /// `--:`. [M]
DashDashGt "`-->`", /// `-->`. [M]
Ques "`?`", /// `?`. [M]
Bang "`!`", /// `!`. [M]
Newline match &locale[..] { "ko" => "개행문자", _ => "a newline" },
/// A newline. Only generated at the end of the meta block.
}
macro_rules! define_keywords {
($ty:ident: everywhere { $($i:ident $t:expr, #[$m:meta])* }
meta_only { $($mi:ident $mt:expr, #[$mm:meta])* }) => (
/// A keyword.
///
/// This includes Kailua-specific keywords,
/// which are only generated in the meta block (marked as [M] below).
/// Some of them are also only generated after a particular Lua version
/// (marked as [5.x+] below).
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum $ty { $(#[$m] $i,)* $(#[$mm] $mi,)* }
impl $ty {
pub fn from(s: &[u8], in_meta: bool) -> Option<Keyword> {
match (in_meta, s) {
$((_, $t) => Some(Keyword::$i),)*
$((true, $mt) => Some(Keyword::$mi),)*
(_, _) => None,
}
}
pub fn name(&self) -> &'static [u8] {
match *self { $($ty::$i => $t,)* $($ty::$mi => $mt,)* }
}
}
);
}
define_keywords! { Keyword:
everywhere {
And b"and", /// `and`.
Break b"break", /// `break`.
Do b"do", /// `do`.
Else b"else", /// `else`.
Elseif b"elseif", /// `elseif`.
End b"end", /// `end`.
False b"false", /// `false`.
For b"for", /// `for`.
Function b"function", /// `function`.
Goto b"goto", /// `goto`. [5.2+; a normal identifier in Lua 5.1]
If b"if", /// `if`.
In b"in", /// `in`.
Local b"local", /// `local`.
Nil b"nil", /// `nil`.
Not b"not", /// `not`.
Or b"or", /// `or`.
Repeat b"repeat", /// `repeat`.
Return b"return", /// `return`.
Then b"then", /// `then`.
True b"true", /// `true`.
Until b"until", /// `until`.
While b"while", /// `while`.
}
meta_only { // Kailua extensions
Assume b"assume", /// `assume`. [M]
Class b"class", /// `class`. [M]
Const b"const", /// `const`. [M]
Global b"global", /// `global`. [M]
Map b"map", /// `map`. [M]
Method b"method", /// `method`. [M]
Module b"module", /// `module`. [M]
Once b"once", /// `once`. [M]
Open b"open", /// `open`. [M]
Static b"static", /// `static`. [M]
Type b"type", /// `type`. [M]
Var b"var", /// `var`. [M]
Vector b"vector", /// `vector`. [M]
}
}
impl From<Keyword> for Str {
fn from(kw: Keyword) -> Str {
kw.name().into()
}
}
impl From<Keyword> for Name {
fn from(kw: Keyword) -> Name {
kw.name().into()
}
}
impl Localize for Keyword {
fn fmt_localized(&self, f: &mut fmt::Formatter, locale: Locale) -> fmt::Result {
let name = str::from_utf8(self.name()).unwrap();
match &locale[..] {
"ko" => write!(f, "예약어 `{}`", name),
_ => write!(f, "a keyword `{}`", name),
}
}
}
mod lexer;
mod nesting;
pub use self::lexer::Lexer;
pub use self::nesting::{Nest, NestedToken, NestingCategory, NestingSerial};