19f7ad09a7
Add conditional expressions of the form:
foo := if lhs == rhs { then } else { otherwise }
`lhs`, `rhs`, `then`, and `otherwise` are all arbitrary expressions, and
can recursively include other conditionals. Conditionals short-circuit,
so the branch not taken isn't evaluated.
It is also possible to test for inequality with `==`.
72 lines
1.4 KiB
Rust
72 lines
1.4 KiB
Rust
use crate::common::*;
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#[derive(Debug, PartialEq, Clone, Copy, Ord, PartialOrd, Eq)]
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pub(crate) enum TokenKind {
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Asterisk,
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At,
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Backtick,
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BangEquals,
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BraceL,
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BraceR,
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BracketL,
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BracketR,
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Colon,
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ColonEquals,
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Comma,
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Comment,
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Dedent,
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Eof,
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Eol,
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Equals,
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EqualsEquals,
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Identifier,
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Indent,
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InterpolationEnd,
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InterpolationStart,
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ParenL,
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ParenR,
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Plus,
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StringCooked,
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StringRaw,
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Text,
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Unspecified,
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Whitespace,
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}
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impl Display for TokenKind {
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fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> {
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use TokenKind::*;
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write!(f, "{}", match *self {
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Asterisk => "'*'",
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At => "'@'",
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Backtick => "backtick",
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BangEquals => "'!='",
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BraceL => "'{'",
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BraceR => "'}'",
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BracketL => "'['",
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BracketR => "']'",
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Colon => "':'",
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ColonEquals => "':='",
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Comma => "','",
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Comment => "comment",
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Dedent => "dedent",
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Eof => "end of file",
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Eol => "end of line",
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Equals => "'='",
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EqualsEquals => "'=='",
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Identifier => "identifier",
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Indent => "indent",
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InterpolationEnd => "'}}'",
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InterpolationStart => "'{{'",
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ParenL => "'('",
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ParenR => "')'",
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Plus => "'+'",
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StringCooked => "cooked string",
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StringRaw => "raw string",
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Text => "command text",
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Whitespace => "whitespace",
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Unspecified => "unspecified",
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})
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}
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}
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