cranpose-text 0.18.0

Text styles, fonts, shaping and paragraph layout for Cranpose
Documentation 
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// The widths at which a layout keeps its lines: a layout of the text at a
// width inside them breaks it into the same lines.

use crate::{
    layout_input::LayoutInput,
    layout_options::TextLayoutOptions,
    line_breaker::{BreakOpportunity, BrokenLine, Wrapping},
    line_text::indent,
    paragraph::LineBreak,
    text_layout::WidthRange,
};

// The hold of a text that fits on one line `line` wide with its indent:
// any width that keeps it on one line, when it wraps.
pub(crate) fn fitting_hold(options: &TextLayoutOptions, line: f32) -> WidthRange {
    WidthRange {
        min: if options.soft_wrap {
            line
        } else {
            f32::NEG_INFINITY
        },
        max: f32::INFINITY,
    }
}

// The hold of a text broken into `lines` at `breaks`: every width when
// lines do not wrap, for greedy breaking the limits each line keeps its end
// over moved by its indent, and none for even breaking, whose lines can move
// with any width.
pub(crate) fn wrapped_hold(
    lines: &[BrokenLine],
    input: &LayoutInput<'_>,
    options: &TextLayoutOptions,
    wrapping: &Wrapping<'_>,
    breaks: &[BreakOpportunity],
) -> Option<WidthRange> {
    if !options.soft_wrap {
        return Some(WidthRange::ALL);
    }
    if !matches!(
        input.paragraph.line_break,
        LineBreak::Simple | LineBreak::Unspecified
    ) {
        return None;
    }
    let mut hold = WidthRange::ALL;
    for line in lines {
        let (min, max) = wrapping.greedy_limits(line, breaks);
        let indent = indent(input, line.text.start);
        hold.narrow(min + indent, max + indent);
    }
    Some(hold)
}