filetype: rust

detect:
    filename: "\\.rs$"

rules:
    # function definition
    - identifier: "fn [a-z0-9_]+"
      # Reserved words
    - statement: "\\b(abstract|alignof|as|become|box|break|const|continue|crate|do|dyn|else|enum|extern|false|final|fn|for|if|impl|in|let|loop|macro|match|mod|move|mut|offsetof|override|priv|pub|pure|ref|return|sizeof|static|self|struct|super|true|trait|type|typeof|unsafe|unsized|use|virtual|where|while|yield)\\b"
      # macros
    - special: "[a-z_]+!"
      # Constants
    - constant: "\\b[A-Z][A-Z_0-9]+\\b"
      # Numbers
    - constant.number: "\\b[0-9]+\\b"
      # Booleans
    - constant: "\\b(true|false)\\b"
      # Traits/Enums/Structs/Types/etc.
    - type: "\\b[A-Z]+[a-zA-Z_0-9]*[a-z]+[a-zA-Z_0-9]*\\b"
      # Builtin types that start with lowercase.
    - type: "\\b(bool|str|isize|usize|((i|u)(8|16|32|64))|f32|f64)\\b"

    - constant.string:
        start: "\""
        end: "\""
        skip: '\\.'
        rules:
            - constant.specialChar: '\\.'

    - constant.string:
        start: "r#+\""
        end: "\"#+"
        rules: []

    # Character literals
    # NOTE: This is an ugly hack to work around the fact that rust uses
    # single quotes both for character literals and lifetimes.
    # Match all character literals.
    - constant.string: "'(\\\\.|.)'"
    # Match the '"' literal which would otherwise match
    # as a double quoted string and destroy the highlighting.
    - constant.string:
        start: "'\""
        end: "'"
        rules: []

    - comment:
        start: "//"
        end: "$"
        rules:
            - todo: "(TODO|XXX|FIXME):?"

    - comment:
        start: "/\\*"
        end: "\\*/"
        rules:
            - todo: "(TODO|XXX|FIXME):?"

    - special:
        start: "#!\\["
        end: "\\]"
        rules: []