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use super::{Token, TokenType};
pub fn tokenize(input: &str) -> Vec<Token<'_>> {
let char_indices: Vec<_> = input.char_indices().collect();
let char_indices = &char_indices[..];
let mut idx = 0;
let (mut last_line, mut last_column) = (0, 0);
let (mut line, mut column) = (0, 0);
let mut just_ignore: usize = 0;
enum CommentState {
None,
Line,
Block,
}
let mut comment_state = CommentState::None;
enum QuotingState {
None,
Single(usize),
Double(usize),
}
let mut quoting_state = QuotingState::None;
let mut lidx: Option<usize> = None;
enum NormalState<'a> {
Identifier,
Number(Option<&'a str>),
}
let mut normal_state = NormalState::Identifier;
let mut ans = Vec::new();
while let Some((i, c)) = char_indices.get(idx) {
'scope : {
match just_ignore {
ref mut x if *x > 0 => {
*x -= 1;
break 'scope;
}
_ => (),
}
match quoting_state {
QuotingState::None => {
if *c == '\'' {
quoting_state = QuotingState::Single(*i);
break 'scope;
} else if *c == '"' {
quoting_state = QuotingState::Double(*i);
break 'scope;
}
}
QuotingState::Single(l) => {
if *c == '\'' {
ans.push(Token { token_type: TokenType::CharLiteral(&input[l+1..*i], true), line, column, });
quoting_state = QuotingState::None;
} else if *c == '\n' {
ans.push(Token { token_type: TokenType::CharLiteral(&input[l+1..*i], false), line, column, });
quoting_state = QuotingState::None;
}
break 'scope;
}
QuotingState::Double(l) => {
if *c == '"' {
ans.push(Token { token_type: TokenType::StringLiteral(&input[l+1..*i], true), line, column, });
quoting_state = QuotingState::None;
} else if *c == '\n' {
ans.push(Token { token_type: TokenType::StringLiteral(&input[l+1..*i], false), line, column, });
quoting_state = QuotingState::None;
}
break 'scope;
}
}
match comment_state {
CommentState::None => {
if *c == '/' {
if let Some((_, c2)) = char_indices.get(idx + 1) {
if *c2 == '/' {
comment_state = CommentState::Line;
just_ignore = 1;
break 'scope;
} else if *c2 == '*' {
comment_state = CommentState::Block;
just_ignore = 1;
break 'scope;
}
}
}
}
CommentState::Line => {
if *c == '\n' {
comment_state = CommentState::None;
}
break 'scope;
}
CommentState::Block => {
if *c == '*' {
if let Some((_, c2)) = char_indices.get(idx + 1) {
if *c2 == '/' {
comment_state = CommentState::None;
just_ignore = 1;
break 'scope;
}
}
}
break 'scope;
}
}
let mut punt = false;
match lidx {
Some(l) => {
let mut should_put = false;
if c.is_ascii_whitespace() {
should_put = true;
}
if c.is_ascii_punctuation() {
let mut i = true;
if *c == '.' {
if let NormalState::Number(_) = normal_state {
i = false;
}
}
if *c == '$' || *c == '@' || *c == '_' {
i = false;
}
if i {
should_put = true;
punt = true;
}
}
if should_put {
match normal_state {
NormalState::Identifier => {
let s = &input[l..*i];
if let Some(k) = try_into_keyword(s) {
ans.push(Token { token_type: TokenType::Keyword(k), line: last_line, column: last_column, });
} else {
ans.push(Token { token_type: TokenType::Identifier(s), line: last_line, column: last_column, });
}
}
NormalState::Number(prefix) => {
let s = &input[l..*i];
ans.push(Token { token_type: TokenType::NumberLiteral(s, prefix), line: last_line, column: last_column });
}
}
lidx = None;
}
},
None => {
if c.is_whitespace() {
break 'scope;
}
if c.is_ascii_punctuation() {
punt = true;
if *c == '$' || *c == '@' || *c == '_' {
punt = false;
}
}
if !punt {
lidx = Some(*i);
if c.is_digit(10) {
normal_state = NormalState::Number(None);
if *c == '0' {
let p = char_indices.get(idx + 1);
match p {
Some((_, 'x')) | Some((_, 'X')) | Some((_, 'b')) | Some((_, 'B')) => {
normal_state = NormalState::Number(Some(&input[*i..i+2]));
just_ignore = 1;
break 'scope;
}
_ => {
normal_state = NormalState::Number(Some(&input[*i..i+1]));
}
}
}
} else {
normal_state = NormalState::Identifier;
}
}
},
}
if punt {
use TokenType::*;
match c {
'(' => {
ans.push(Token { token_type: Parenthesis { is_left: true }, line, column, });
}
')' => {
ans.push(Token { token_type: Parenthesis { is_left: false }, line, column, });
}
'[' => {
ans.push(Token { token_type: Bracket { is_left: true }, line, column, });
}
']' => {
ans.push(Token { token_type: Bracket { is_left: false }, line, column, });
}
'{' => {
ans.push(Token { token_type: Brace { is_left: true }, line, column, });
}
'}' => {
ans.push(Token { token_type: Brace { is_left: false }, line, column, });
}
| '.' | ',' | ';' | '~' | ':' => {
ans.push(Token { token_type: Operator(&input[*i..i+1]), line, column, });
}
// every puntc here can be followed by '='
| '<' | '=' | '>' | '+' | '-' | '*' | '/' | '%' | '&' | '^' | '|' | '!' => {
if *c == '<' {
let p = (char_indices.get(idx + 1), char_indices.get(idx + 2));
match p {
(Some((_, '<')), Some((_, '='))) => {
ans.push(Token { token_type: Operator(&input[*i..i+3]), line, column: column + 2 });
just_ignore = 2;
break 'scope;
}
_ => (),
}
}
if *c == '>' {
let p = (char_indices.get(idx + 1), char_indices.get(idx + 2));
match p {
(Some((_, '>')), Some((_, '='))) => {
ans.push(Token { token_type: Operator(&input[*i..i+3]), line, column: column + 2 });
just_ignore = 2;
break 'scope;
}
_ => (),
}
}
let p = char_indices.get(idx + 1);
match p {
Some((_, '=')) => {
ans.push(Token { token_type: Operator(&input[*i..i+2]), line, column: column + 1 });
just_ignore = 1;
break 'scope;
}
_ => (),
}
if *c == '+' || *c == '-' || *c == '&' || *c == '|' {
match p {
Some((_, b)) if *b == *c => {
ans.push(Token { token_type: Operator(&input[*i..i+2]), line, column: column + 1});
just_ignore = 1;
break 'scope;
}
_ => (),
}
}
if *c == '-' {
match p {
Some((_, '>')) => {
ans.push(Token { token_type: Operator(&input[*i..i+2]), line, column: column + 1});
just_ignore = 1;
break 'scope;
}
_ => (),
}
}
ans.push(Token { token_type: Operator(&input[*i..i+1]), line, column });
}
_ => {
ans.push(Token { token_type: Operator(&input[*i..i+1]), line, column });
}
}
}
}
(last_line, last_column) = (line, column);
if *c == '\n' {
line += 1;
column = 0;
} else {
column += 1;
}
idx += 1;
}
return ans;
}
pub fn try_into_keyword(input: &str) -> Option<super::Keyword> {
use super::Keyword::*;
let ans = match input {
"alignas" => AlignAs,
"alignof" => AlignOf,
"auto" => Auto,
"bool" => Bool,
"break" => Break,
"case" => Case,
"char" => Char,
"const" => Const,
"constexpr" => Constexpr,
"continue" => Continue,
"default" => Default,
"do" => Do,
"double" => Double,
"else" => Else,
"enum" => Enum,
"extern" => Extern,
"false" => False,
"float" => Float,
"for" => For,
"goto" => Goto,
"if" => If,
"inline" => Inline,
"int" => Int,
"long" => Long,
"nullptr" => Nullptr,
"register" => Register,
"restrict" => Restrict,
"return" => Return,
"short" => Short,
"signed" => Signed,
"sizeof" => Sizeof,
"static" => Static,
"static_assert" => StaticAssert,
"struct" => Struct,
"switch" => Switch,
"thread_local" => ThreadLocal,
"true" => True,
"typedef" => Typedef,
"typeof" => TypeOf,
"typeof_unqual" => TypeOfUnqual,
"union" => Union,
"unsigned" => Unsigned,
"void" => Void,
"volatile" => Volatile,
"while" => While,
"_Alignas" => _AlignAs,
"_Alignof" => _AlignOf,
"_Atomic" => _Atomic,
"_Bool" => _Bool,
"_Complex" => _Complex,
"_Decimal128" => _Decimal128,
"_Decimal32" => _Decimal32,
"_Decimal64" => _Decimal64,
"_Generic" => _Generic,
"_Imaginary" => _Imaginary,
"_Noreturn" => _Noreturn,
"_Static_assert" => _StaticAssert,
"_Thread_local" => _ThreadLocal,
"asm" => Asm,
_ => return None,
};
Some(ans)
}