boa_ast 0.21.1

Abstract Syntax Tree definition for the Boa JavaScript engine.
Documentation 
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use crate::{LinearPosition, LinearSpan};

/// Source text.
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
#[derive(Clone, Debug)]
pub struct SourceText {
    source_text: Vec<u16>,
}

impl SourceText {
    /// Constructs a new, empty `SourceText` with at least the specified capacity.
    #[must_use]
    pub fn with_capacity(capacity: usize) -> Self {
        Self {
            source_text: Vec::with_capacity(capacity),
        }
    }

    /// Get current `LinearPosition`.
    #[must_use]
    pub fn cur_linear_position(&self) -> LinearPosition {
        LinearPosition::new(self.source_text.len())
    }

    /// Get code points from `pos` to the current end.
    #[must_use]
    pub fn get_code_points_from_pos(&self, pos: LinearPosition) -> &[u16] {
        &self.source_text[pos.pos()..]
    }

    /// Get code points within `span`.
    #[must_use]
    pub fn get_code_points_from_span(&self, span: LinearSpan) -> &[u16] {
        &self.source_text[span.start().pos()..span.end().pos()]
    }

    /// Remove last code point.
    #[inline]
    pub fn remove_last_code_point(&mut self) {
        self.source_text.pop();
    }

    /// Collect code point.
    ///
    /// # Panics
    ///
    /// On invalid code point.
    #[inline]
    pub fn collect_code_point(&mut self, cp: u32) {
        if let Ok(cu) = cp.try_into() {
            self.push(cu);
            return;
        }
        let cp = cp - 0x10000;
        let cu1 = (cp / 0x400 + 0xD800)
            .try_into()
            .expect("Invalid code point");
        let cu2 = (cp % 0x400 + 0xDC00)
            .try_into()
            .expect("Invalid code point");
        self.push(cu1);
        self.push(cu2);
    }

    #[inline]
    fn push(&mut self, cp: u16) {
        self.source_text.push(cp);
    }
}

const DEFAULT_CAPACITY: usize = 4 * 1024;

impl Default for SourceText {
    fn default() -> Self {
        Self::with_capacity(DEFAULT_CAPACITY)
    }
}