Struct UnifiedConstraints 

pub struct UnifiedConstraints {

    pub shape_boundaries: Vec<ShapeBoundary>,
    pub shape_exclusions: Vec<ShapeBoundary>,
    pub available_width: AvailableSpace,
    pub available_height: Option<f32>,
    pub writing_mode: Option<WritingMode>,
    pub direction: Option<BidiDirection>,
    pub text_orientation: TextOrientation,
    pub text_align: TextAlign,
    pub text_justify: JustifyContent,
    pub line_height: LineHeight,
    pub vertical_align: VerticalAlign,
    pub strut_ascent: f32,
    pub strut_descent: f32,
    pub strut_x_height: f32,
    pub ch_width: f32,
    pub overflow: OverflowBehavior,
    pub segment_alignment: SegmentAlignment,
    pub text_combine_upright: Option<TextCombineUpright>,
    pub exclusion_margin: f32,
    pub hyphenation: Hyphens,
    pub hyphenation_language: Option<Language>,
    pub text_indent: f32,
    pub text_indent_each_line: bool,
    pub text_indent_hanging: bool,
    pub initial_letter: Option<InitialLetter>,
    pub line_clamp: Option<NonZeroUsize>,
    pub text_wrap: TextWrap,
    pub columns: u32,
    pub column_gap: f32,
    pub hanging_punctuation: bool,
    pub overflow_wrap: OverflowWrap,
    pub text_align_last: TextAlign,
    pub word_break: WordBreak,
    pub white_space_mode: WhiteSpaceMode,
    pub line_break: LineBreakStrictness,
    pub unicode_bidi: UnicodeBidi,
}

Unified constraints combining all layout features

CSS Inline Layout Module Level 3: Constraint Mapping

This structure maps CSS properties to layout constraints:

\u00a7 2.1 Layout of Line Boxes

• available_width: \u26a0\ufe0f CRITICAL - Should equal containing block’s inner width
  • Currently defaults to 0.0 which causes immediate line breaking
  • Per spec: “logical width of a line box is equal to the inner logical width of its containing block”
• available_height: For block-axis constraints (max-height)

\u00a7 2.2 Layout Within Line Boxes

• text_align: \u2705 Horizontal alignment (start, end, center, justify)
• vertical_align: \u26a0\ufe0f PARTIAL - Only baseline supported, missing:
  • top, bottom, middle, text-top, text-bottom
  • , values
  • sub, super positions
• line_height: \u2705 Distance between baselines

\u00a7 3 Baselines and Alignment Metrics

• text_orientation: \u2705 For vertical writing (sideways, upright)
• writing_mode: \u2705 horizontal-tb, vertical-rl, vertical-lr
• direction: \u2705 ltr, rtl for BiDi

\u00a7 4 Baseline Alignment (vertical-align property)

\u26a0\ufe0f INCOMPLETE: Only basic baseline alignment implemented

\u00a7 5 Line Spacing (line-height property)

• line_height: \u2705 Implemented
• \u274c MISSING: line-fit-edge for controlling which edges contribute to line height +spec:box-model:51342f - inline box margins/borders/padding do not affect line box height (default leading mode) +spec:font-metrics:618776 - line-fit-edge (cap, ex, ideographic, alphabetic edge selection) not yet implemented

\u00a7 6 Trimming Leading (text-box-trim)

• \u274c NOT IMPLEMENTED: text-box-trim property
• \u274c NOT IMPLEMENTED: text-box-edge property +spec:box-model:c09331 - text-box-trim trims block container first/last line to font metrics // +spec:overflow:dc2196 - text-box-trim overflow handled as normal overflow (no special handling needed)

CSS Text Module Level 3

• text_indent: \u2705 First line indentation
• text_justify: \u2705 Justification algorithm (auto, inter-word, inter-character)
• hyphenation: \u2705 Hyphens property (none / manual / auto)
• hanging_punctuation: \u2705 Hanging punctuation at line edges

CSS Text Level 4

• text_wrap: \u2705 balance, pretty, stable
• line_clamp: \u2705 Max number of lines

CSS Writing Modes Level 4

• text_combine_upright: \u2705 Tate-chu-yoko for vertical text

CSS Shapes Module

• shape_boundaries: \u2705 Custom line box shapes
• shape_exclusions: \u2705 Exclusion areas (float-like behavior)
• exclusion_margin: \u2705 Margin around exclusions

Multi-column Layout

• columns: \u2705 Number of columns
• column_gap: \u2705 Gap between columns

Known Issues:

1. [ISSUE] available_width defaults to Definite(0.0) instead of containing block width
2. [ISSUE] vertical_align only supports baseline
3. [TODO] initial-letter (drop caps) not implemented +spec:positioning:fb233a - initial letter block-axis: if size < sink, use over alignment

Fields

shape_boundaries: Vec<ShapeBoundary>

shape_exclusions: Vec<ShapeBoundary>

available_width: AvailableSpace

available_height: Option<f32>

writing_mode: Option<WritingMode>

direction: Option<BidiDirection>

text_orientation: TextOrientation

text_align: TextAlign

text_justify: JustifyContent

line_height: LineHeight

vertical_align: VerticalAlign

strut_ascent: f32

strut_descent: f32

strut_x_height: f32

ch_width: f32

overflow: OverflowBehavior

segment_alignment: SegmentAlignment

text_combine_upright: Option<TextCombineUpright>

exclusion_margin: f32

hyphenation: Hyphens

hyphenation_language: Option<Language>

text_indent: f32

text_indent_each_line: bool

text_indent_hanging: bool

initial_letter: Option<InitialLetter>

line_clamp: Option<NonZeroUsize>

text_wrap: TextWrap

columns: u32

column_gap: f32

hanging_punctuation: bool

overflow_wrap: OverflowWrap

text_align_last: TextAlign

word_break: WordBreak

white_space_mode: WhiteSpaceMode

line_break: LineBreakStrictness

unicode_bidi: UnicodeBidi

Implementations

impl UnifiedConstraints

pub fn resolved_line_height(&self) -> f32

Resolve line_height to a pixel value using the strut metrics as a font-size proxy. strut_ascent + strut_descent approximates font_size (the block container’s font).

Trait Implementations

impl Clone for UnifiedConstraints

fn clone(&self) -> UnifiedConstraints

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for UnifiedConstraints

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for UnifiedConstraints

fn default() -> Self

Returns the “default value” for a type.

impl Hash for UnifiedConstraints

fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for UnifiedConstraints

fn eq(&self, other: &Self) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for UnifiedConstraints