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Change precedence to own type.

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This commit is contained in:
Stephen Chung
2021-03-14 10:47:29 +08:00
parent 008ef0a41b
commit d9df6aabc8
4 changed files with 35 additions and 37 deletions
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10
src/token.rs
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@@ -1,8 +1,8 @@
//! Main module defining the lexer and parser.
use crate::engine::{
KEYWORD_DEBUG, KEYWORD_EVAL, KEYWORD_FN_PTR, KEYWORD_FN_PTR_CALL, KEYWORD_FN_PTR_CURRY,
KEYWORD_IS_DEF_VAR, KEYWORD_PRINT, KEYWORD_THIS, KEYWORD_TYPE_OF,
Precedence, KEYWORD_DEBUG, KEYWORD_EVAL, KEYWORD_FN_PTR, KEYWORD_FN_PTR_CALL,
KEYWORD_FN_PTR_CURRY, KEYWORD_IS_DEF_VAR, KEYWORD_PRINT, KEYWORD_THIS, KEYWORD_TYPE_OF,
};
use crate::stdlib::{
borrow::Cow,
@@ -666,10 +666,10 @@ impl Token {
}
/// Get the precedence number of the token.
pub fn precedence(&self) -> u8 {
pub fn precedence(&self) -> Option<Precedence> {
use Token::*;
match self {
Precedence::new(match self {
// Assignments are not considered expressions - set to zero
Equals | PlusAssign | MinusAssign | MultiplyAssign | DivideAssign | PowerOfAssign
| LeftShiftAssign | RightShiftAssign | AndAssign | OrAssign | XOrAssign
@@ -696,7 +696,7 @@ impl Token {
Period => 240,
_ => 0,
}
})
}
/// Does an expression bind to the right (instead of left)?