forked from extern/nushell
93e8f6c05e
We split off the evaluation engine part of nu-cli into its own crate. This helps improve build times for nu-cli by 17% in my tests. It also helps us see a bit better what's the core engine portion vs the part specific to the interactive CLI piece. There's more than can be done here, but I think it's a good start in the right direction.
86 lines
2.5 KiB
Rust
86 lines
2.5 KiB
Rust
use crate::evaluate::scope::Scope;
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use crate::shell::palette::Palette;
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use ansi_term::{Color, Style};
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use nu_parser::ParserScope;
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use nu_protocol::hir::FlatShape;
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use nu_source::Spanned;
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use std::borrow::Cow;
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// FIXME: find a good home, as nu-engine may be too core for styling
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pub struct Painter {
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original: Vec<u8>,
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styles: Vec<Style>,
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}
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impl Painter {
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fn new(original: &str) -> Painter {
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let bytes: Vec<u8> = original.bytes().collect();
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let bytes_count = bytes.len();
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Painter {
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original: bytes,
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styles: vec![Color::White.normal(); bytes_count],
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}
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}
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pub fn paint_string<'l, P: Palette>(line: &'l str, scope: &Scope, palette: &P) -> Cow<'l, str> {
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scope.enter_scope();
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let (block, _) = nu_parser::parse(line, 0, scope);
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scope.exit_scope();
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let shapes = nu_parser::shapes(&block);
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let mut painter = Painter::new(line);
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for shape in shapes {
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painter.paint_shape(&shape, palette);
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}
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Cow::Owned(painter.into_string())
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}
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fn paint_shape<P: Palette>(&mut self, shape: &Spanned<FlatShape>, palette: &P) {
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palette
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.styles_for_shape(shape)
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.iter()
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.for_each(|x| self.paint(x));
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}
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fn paint(&mut self, styled_span: &Spanned<Style>) {
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for pos in styled_span.span.start()..styled_span.span.end() {
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self.styles[pos] = styled_span.item;
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}
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}
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fn into_string(self) -> String {
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let mut idx_start = 0;
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let mut idx_end = 1;
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if self.original.is_empty() {
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String::new()
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} else {
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let mut builder = String::new();
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let mut current_style = self.styles[0];
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while idx_end < self.styles.len() {
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if self.styles[idx_end] != current_style {
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// Emit, as we changed styles
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let intermediate = String::from_utf8_lossy(&self.original[idx_start..idx_end]);
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builder.push_str(&format!("{}", current_style.paint(intermediate)));
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current_style = self.styles[idx_end];
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idx_start = idx_end;
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idx_end += 1;
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} else {
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idx_end += 1;
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}
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}
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let intermediate = String::from_utf8_lossy(&self.original[idx_start..idx_end]);
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builder.push_str(&format!("{}", current_style.paint(intermediate)));
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builder
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}
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}
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}
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