string_machine.rs — tailwindcss Source File

Source Code

use crate::cursor;
use crate::extractor::machine::{Machine, MachineState};
use classification_macros::ClassifyBytes;

/// Extracts a string (including the quotes) from the input.
///
/// Rules:
///
/// - The string must start and end with the same quote character.
/// - The string cannot contain any whitespace characters.
/// - The string can contain any other character except for the quote character (unless it's escaped).
/// - Balancing of brackets is not required.
///
///
/// E.g.:
///
/// ```text
/// 'hello_world'
/// ^^^^^^^^^^^^^
///
/// content-['hello_world']
///          ^^^^^^^^^^^^^
/// ```
#[derive(Debug, Default)]
pub struct StringMachine;

impl Machine for StringMachine {
    #[inline(always)]
    fn reset(&mut self) {}

    #[inline]
    fn next(&mut self, cursor: &mut cursor::Cursor<'_>) -> MachineState {
        if Class::Quote != cursor.curr.into() {
            return MachineState::Idle;
        }

        // Start of a string
        let len = cursor.input.len();
        let start_pos = cursor.pos;
        let end_char = cursor.curr;

        cursor.advance();

        while cursor.pos < len {
            match cursor.curr.into() {
                Class::Escape => match cursor.next.into() {
                    // An escaped whitespace character is not allowed
                    Class::Whitespace => return MachineState::Idle,

                    // An escaped character, skip ahead to the next character
                    _ => cursor.advance(),
                },

                // End of the string
                Class::Quote if cursor.curr == end_char => return self.done(start_pos, cursor),

                // Any kind of whitespace is not allowed
                Class::Whitespace => return MachineState::Idle,

                // Everything else is valid
// ... (79 more lines)