hawdb-sql-syntax 0.10.0

An embedded Rust graph database for local data-plane workloads
Documentation 
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// Copyright 2026 Nowledge
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use crate::Span;

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum TokenKind {
    Word,
    QuotedIdentifier,
    String,
    Number,
    Parameter(u32),
    LeftParen,
    RightParen,
    LeftBracket,
    RightBracket,
    LeftBrace,
    RightBrace,
    Comma,
    Dot,
    Semicolon,
    Colon,
    DoubleColon,
    Plus,
    Minus,
    Star,
    Slash,
    Percent,
    Equal,
    Less,
    Greater,
    LessOrEqual,
    GreaterOrEqual,
    NotEqual,
    Concat,
    ArrowLeft,
    ArrowRight,
    Pipe,
    Ampersand,
    Caret,
    Question,
    End,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct Token {
    pub kind: TokenKind,
    pub span: Span,
}

impl Token {
    pub const fn new(kind: TokenKind, span: Span) -> Self {
        Self { kind, span }
    }

    pub fn text(self, input: &str) -> &str {
        input
            .get(self.span.start..self.span.end)
            .unwrap_or_default()
    }

    pub fn is_keyword(self, input: &str, keyword: &str) -> bool {
        self.kind == TokenKind::Word && self.text(input).eq_ignore_ascii_case(keyword)
    }
}