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dioxus/packages/core-macro/styles/syn_parse.rs
Jonathan Kelley 160d86abbe wip: serious refactor with const generics
2021-07-21 22:55:04 -04:00

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//! Implementation of `syn::parse::Parse` for styles, and associated helper data/functions.
// TODO make all parsers use HyphenWord where appropriate.
// TODO make all error messages nice
// TODO 100% test coverage
// TODO see if I can get https://github.com/rust-lang/rust/issues/67544 accepted. then change "em" to
// em and "ex" to ex.
// TODO Split out extra "Dynamic" layer for each type for use in proc macro (so we can have `{ <arbitary
// rust code> }`)
use crate::*;
use proc_macro2::Span;
use std::{
cell::RefCell,
collections::BTreeSet,
fmt::{self, Write},
ops::RangeBounds,
str,
};
use syn::{
ext::IdentExt,
parse::{discouraged::Speculative, Parse, ParseStream},
punctuated::Punctuated,
spanned::Spanned,
Ident, Token,
};
use super::{DynamicStyle, DynamicStyles, Styles};
impl Parse for DynamicStyles {
fn parse(s: ParseStream) -> syn::Result<Self> {
let punc = s.parse_terminated::<_, Token![;]>(<DynamicStyle as Parse>::parse)?;
Ok(DynamicStyles::from(punc.into_iter().collect::<Vec<_>>()))
}
}
impl Parse for Styles {
fn parse(s: ParseStream) -> syn::Result<Self> {
let punc = s.parse_terminated::<_, Token![;]>(<Style as Parse>::parse)?;
Ok(Styles::from(punc.into_iter().collect::<Vec<_>>()))
}
}
impl Parse for DynamicStyle {
fn parse(s: ParseStream) -> syn::Result<Self> {
// Pass through brackets
if s.peek(syn::token::Brace) {
Ok(DynamicStyle::Dynamic(s.parse()?))
} else {
Ok(DynamicStyle::Literal(s.parse()?))
}
}
}
impl Parse for Style {
fn parse(s: ParseStream) -> syn::Result<Self> {
if s.peek(syn::LitStr) {
let unchecked: syn::LitStr = s.parse()?;
return Ok(Style::Unchecked(unchecked.value()));
}
let name: HyphenWord = s.parse()?;
if name.try_match("dummy") {
return Ok(Style::Dummy);
}
s.parse::<Token![:]>()?;
let output = if name.try_match("align-content") {
Style::AlignContent(s.parse()?)
} else if name.try_match("align-items") {
Style::AlignItems(s.parse()?)
} else if name.try_match("align-self") {
Style::AlignSelf(s.parse()?)
// all
// background
} else if name.try_match("background-attachment") {
Style::BackgroundAttachment(s.parse()?)
} else if name.try_match("background-blend-mode") {
Style::BackgroundBlendMode(s.parse()?)
} else if name.try_match("background-clip") {
Style::BackgroundClip(s.parse()?)
} else if name.try_match("background-color") {
Style::BackgroundColor(s.parse()?)
} else if name.try_match("background-image") {
Style::BackgroundImage(s.parse()?)
} else if name.try_match("background-origin") {
Style::BackgroundOrigin(s.parse()?)
} else if name.try_match("background-position") {
Style::BackgroundPosition(s.parse()?)
} else if name.try_match("background-repeat") {
Style::BackgroundRepeat(s.parse()?)
} else if name.try_match("background-size") {
Style::BackgroundSize(s.parse()?)
} else if name.try_match("border") {
Style::Border(s.parse()?)
} else if name.try_match("border-bottom") {
Style::BorderBottom(s.parse()?)
} else if name.try_match("border-bottom-color") {
Style::BorderBottomColor(s.parse()?)
} else if name.try_match("border-bottom-left-radius") {
Style::BorderBottomLeftRadius(s.parse()?)
} else if name.try_match("border-bottom-right-radius") {
Style::BorderBottomRightRadius(s.parse()?)
} else if name.try_match("border-bottom-style") {
Style::BorderBottomStyle(s.parse()?)
} else if name.try_match("border-bottom-width") {
Style::BorderBottomWidth(s.parse()?)
} else if name.try_match("border-collapse") {
Style::BorderCollapse(s.parse()?)
} else if name.try_match("border-color") {
Style::BorderColor(s.parse()?)
// border-image
// border-image-outset
// border-image-repeat
// border-image-slice
// border-image-source
// border-image-width
} else if name.try_match("border-left") {
Style::BorderLeft(s.parse()?)
} else if name.try_match("border-left-color") {
Style::BorderLeftColor(s.parse()?)
} else if name.try_match("border-left-style") {
Style::BorderLeftStyle(s.parse()?)
} else if name.try_match("border-left-width") {
Style::BorderLeftWidth(s.parse()?)
} else if name.try_match("border-radius") {
Style::BorderRadius(s.parse()?)
} else if name.try_match("border-right") {
Style::BorderRight(s.parse()?)
} else if name.try_match("border-right-color") {
Style::BorderRightColor(s.parse()?)
} else if name.try_match("border-right-style") {
Style::BorderRightStyle(s.parse()?)
} else if name.try_match("border-right-width") {
Style::BorderRightWidth(s.parse()?)
// border-spacing
} else if name.try_match("border-style") {
Style::BorderStyle(s.parse()?)
} else if name.try_match("border-top") {
Style::BorderTop(s.parse()?)
} else if name.try_match("border-top-color") {
Style::BorderTopColor(s.parse()?)
} else if name.try_match("border-top-left-radius") {
Style::BorderTopLeftRadius(s.parse()?)
} else if name.try_match("border-top-right-radius") {
Style::BorderTopRightRadius(s.parse()?)
} else if name.try_match("border-top-style") {
Style::BorderTopStyle(s.parse()?)
} else if name.try_match("border-top-width") {
Style::BorderTopWidth(s.parse()?)
} else if name.try_match("border-width") {
Style::BorderWidth(s.parse()?)
} else if name.try_match("bottom") {
Style::Bottom(s.parse()?)
// box-decoration-break
} else if name.try_match("box-shadow") {
Style::BoxShadow(s.parse()?)
} else if name.try_match("box-sizing") {
Style::BoxSizing(s.parse()?)
// break-after
// break-before
// break-inside
// caption-side
// caret-color
} else if name.try_match("clear") {
Style::Clear(s.parse()?)
// clip
// clip-path
// clip-rule
} else if name.try_match("column-count") {
Style::ColumnCount(s.parse()?)
} else if name.try_match("color") {
Style::Color(s.parse()?)
// contain
// content
// counter-increment
// counter-reset
// cue
// cue-after
// cue-before
} else if name.try_match("cursor") {
Style::Cursor(s.parse()?)
// direction
} else if name.try_match("display") {
Style::Display(s.parse()?)
// elevation
// empty-cells
// flex
} else if name.try_match("flex-basis") {
Style::FlexBasis(s.parse()?)
} else if name.try_match("flex-direction") {
Style::FlexDirection(s.parse()?)
// flex-flow
} else if name.try_match("flex-grow") {
let number: Number = s.parse()?;
if !number.suffix.is_empty() {
return Err(syn::Error::new(number.span, "expected number"));
}
Style::FlexGrow(number.value)
} else if name.try_match("flex-shrink") {
let number: Number = s.parse()?;
if !number.suffix.is_empty() {
return Err(syn::Error::new(number.span, "expected number"));
}
Style::FlexShrink(number.value)
} else if name.try_match("flex-wrap") {
Style::FlexWrap(s.parse()?)
} else if name.try_match("float") {
Style::Float(s.parse()?)
// font
} else if name.try_match("font-family") {
Style::FontFamily(s.parse()?)
// font-feature-settings
// font-kerning
} else if name.try_match("font-size") {
Style::FontSize(s.parse()?)
// font-size-adjust
// font-stretch
} else if name.try_match("font-style") {
Style::FontStyle(s.parse()?)
// font-synthesis
// font-variant
// font-variant-caps
// font-variant-east-asian
// font-variant-ligatures
// font-variant-numeric
// font-variant-position
} else if name.try_match("font-weight") {
Style::FontWeight(s.parse()?)
// glyph-orientation-vertical
// grid
// grid-area
// grid-auto-columns
// grid-auto-flow
// grid-auto-rows
// grid-column
// grid-column-end
// grid-column-start
// grid-row
// grid-row-end
// grid-row-start
// grid-template
// grid-template-areas
// grid-template-columns
// grid-template-rows
} else if name.try_match("height") {
Style::Height(s.parse()?)
// image-orientation
// image-rendering
// isolation
} else if name.try_match("justify-content") {
Style::JustifyContent(s.parse()?)
} else if name.try_match("left") {
Style::Left(s.parse()?)
// letter-spacing
} else if name.try_match("line-height") {
Style::LineHeight(s.parse()?)
// list-style
// list-style-image
// list-style-position
} else if name.try_match("list-style-type") {
Style::ListStyleType(s.parse()?)
} else if name.try_match("margin") {
Style::Margin(s.parse()?)
} else if name.try_match("margin-bottom") {
Style::MarginBottom(s.parse()?)
} else if name.try_match("margin-left") {
Style::MarginLeft(s.parse()?)
} else if name.try_match("margin-right") {
Style::MarginRight(s.parse()?)
} else if name.try_match("margin-top") {
Style::MarginTop(s.parse()?)
// mask
// mask-border
// mask-border-mode
// mask-border-outset
// mask-border-repeat
// mask-border-slice
// mask-border-source
// mask-border-width
// mask-clip
// mask-composite
// mask-image
// mask-mode
// mask-origin
// mask-position
// mask-repeat
// mask-size
// mask-type
} else if name.try_match("max-height") {
Style::MaxHeight(s.parse()?)
} else if name.try_match("max-width") {
Style::MaxWidth(s.parse()?)
} else if name.try_match("min-height") {
Style::MinHeight(s.parse()?)
} else if name.try_match("min-width") {
Style::MinWidth(s.parse()?)
// mix-blend-mode
} else if name.try_match("object-fit") {
Style::ObjectFit(s.parse()?)
// object-position
// opacity
// order
// orphans
// outline
// outline-color
// outline-offset
// outline-style
// outline-width
} else if name.try_match("overflow") {
Style::Overflow(s.parse()?)
} else if name.try_match("overflow-x") {
Style::OverflowX(s.parse()?)
} else if name.try_match("overflow-y") {
Style::OverflowY(s.parse()?)
} else if name.try_match("padding") {
Style::Padding(s.parse()?)
} else if name.try_match("padding-bottom") {
Style::PaddingBottom(s.parse()?)
} else if name.try_match("padding-left") {
Style::PaddingLeft(s.parse()?)
} else if name.try_match("padding-right") {
Style::PaddingRight(s.parse()?)
} else if name.try_match("padding-top") {
Style::PaddingTop(s.parse()?)
// page-break-after
// page-break-before
// page-break-inside
// pause
// pause-after
// pause-before
// pitch
// pitch-range
// play-during
} else if name.try_match("position") {
Style::Position(s.parse()?)
// quotes
} else if name.try_match("resize") {
Style::Resize(s.parse()?)
// richness
} else if name.try_match("right") {
Style::Right(s.parse()?)
// scroll-margin
// scroll-margin-block
// scroll-margin-block-end
// scroll-margin-block-start
// scroll-margin-bottom
// scroll-margin-inline
// scroll-margin-inline-end
// scroll-margin-inline-start
// scroll-margin-left
// scroll-margin-right
// scroll-margin-top
// scroll-padding
// scroll-padding-block
// scroll-padding-block-end
// scroll-padding-block-start
// scroll-padding-bottom
// scroll-padding-inline
// scroll-padding-inline-end
// scroll-padding-inline-start
// scroll-padding-left
// scroll-padding-right
// scroll-padding-top
// scroll-snap-align
// scroll-snap-stop
// scroll-snap-type
// shape-image-threshold
// shape-margin
// shape-outside
// speak
// speak-header
// speak-numeral
// speak-punctuation
// speech-rate
// stress
// table-layout
} else if name.try_match("text-align") {
Style::TextAlign(s.parse()?)
// text-combine-upright
// text-decoration
// text-decoration-color
// text-decoration-line
// text-decoration-style
// text-emphasis
// text-emphasis-color
// text-emphasis-position
// text-emphasis-style
// text-indent
// text-orientation
// text-overflow
// text-shadow
// text-transform
// text-underline-position
} else if name.try_match("top") {
Style::Top(s.parse()?)
// transform
// transform-box
// transform-origin
// unicode-bidi
// vertical-align
// visibility
// voice-family
// volume
} else if name.try_match("white-space") {
Style::WhiteSpace(s.parse()?)
} else if name.try_match("widows") {
Style::Widows(integer(s, 1..)?)
} else if name.try_match("width") {
Style::Width(s.parse()?)
// will-change
// word-spacing
// writing-mode
// z-index
} else {
return Err(name.error());
};
if !finished_rule(s) {
return Err(s.error("unexpected trailing tokens in style rule"));
}
Ok(output)
}
}
impl Parse for AlignContent {
fn parse(s: ParseStream) -> syn::Result<Self> {
let name: HyphenWord = s.parse()?;
if name.try_match("flex-start") {
Ok(AlignContent::FlexStart)
} else if name.try_match("flex-end") {
Ok(AlignContent::FlexEnd)
} else if name.try_match("center") {
Ok(AlignContent::Center)
} else if name.try_match("space-between") {
Ok(AlignContent::SpaceBetween)
} else if name.try_match("space-around") {
Ok(AlignContent::SpaceAround)
} else if name.try_match("stretch") {
Ok(AlignContent::Stretch)
} else {
Err(name.error())
}
}
}
#[test]
fn test_align_content() {
for test in vec![
"flex-start",
"flex-end",
"center",
"space-between",
"space-around",
"stretch",
] {
assert_eq!(
&syn::parse_str::<AlignContent>(test).unwrap().to_string(),
test
);
}
assert_eq!(
&syn::parse_str::<Style>("align-content:flex-start")
.unwrap()
.to_string(),
"align-content:flex-start"
);
}
impl Parse for AlignItems {
fn parse(s: ParseStream) -> syn::Result<Self> {
let word: HyphenWord = s.parse()?;
if word.try_match("normal") {
Ok(AlignItems::Normal)
} else if word.try_match("stretch") {
Ok(AlignItems::Stretch)
} else if word.try_match("center") {
Ok(AlignItems::Center)
} else if word.try_match("start") {
Ok(AlignItems::Start)
} else if word.try_match("end") {
Ok(AlignItems::End)
} else if word.try_match("flex-start") {
Ok(AlignItems::FlexStart)
} else if word.try_match("flex-end") {
Ok(AlignItems::FlexEnd)
} else if word.try_match("baseline") {
Ok(AlignItems::Baseline)
} else if word.try_match("first") {
let word: HyphenWord = s.parse()?;
if word.try_match("baseline") {
Ok(AlignItems::FirstBaseline)
} else {
Err(word.error())
}
} else if word.try_match("last") {
let word: HyphenWord = s.parse()?;
if word.try_match("baseline") {
Ok(AlignItems::LastBaseline)
} else {
Err(word.error())
}
} else if word.try_match("safe") {
let word: HyphenWord = s.parse()?;
if word.try_match("center") {
Ok(AlignItems::SafeCenter)
} else {
Err(word.error())
}
} else if word.try_match("unsafe") {
let word: HyphenWord = s.parse()?;
if word.try_match("center") {
Ok(AlignItems::UnsafeCenter)
} else {
Err(word.error())
}
} else {
Err(word.error())
}
}
}
impl Parse for AlignSelf {
fn parse(s: ParseStream) -> syn::Result<Self> {
let word: HyphenWord = s.parse()?;
if word.try_match("auto") {
Ok(AlignSelf::Auto)
} else if word.try_match("normal") {
Ok(AlignSelf::Normal)
} else if word.try_match("center") {
Ok(AlignSelf::Center)
} else if word.try_match("start") {
Ok(AlignSelf::Start)
} else if word.try_match("self-start") {
Ok(AlignSelf::SelfStart)
} else if word.try_match("self-end") {
Ok(AlignSelf::SelfEnd)
} else if word.try_match("flex-start") {
Ok(AlignSelf::FlexStart)
} else if word.try_match("flex-end") {
Ok(AlignSelf::FlexEnd)
} else if word.try_match("baseline") {
Ok(AlignSelf::Baseline)
} else if word.try_match("first") {
let word: HyphenWord = s.parse()?;
if word.try_match("baseline") {
Ok(AlignSelf::FirstBaseline)
} else {
Err(word.error())
}
} else if word.try_match("last") {
let word: HyphenWord = s.parse()?;
if word.try_match("baseline") {
Ok(AlignSelf::LastBaseline)
} else {
Err(word.error())
}
} else if word.try_match("stretch") {
Ok(AlignSelf::Stretch)
} else if word.try_match("safe") {
let word: HyphenWord = s.parse()?;
if word.try_match("center") {
Ok(AlignSelf::SafeCenter)
} else {
Err(word.error())
}
} else if word.try_match("unsafe") {
let word: HyphenWord = s.parse()?;
if word.try_match("center") {
Ok(AlignSelf::UnsafeCenter)
} else {
Err(word.error())
}
} else {
Err(word.error())
}
}
}
impl Parse for BackgroundAttachment {
fn parse(s: ParseStream) -> syn::Result<Self> {
let word: HyphenWord = s.parse()?;
if word.try_match("scroll") {
Ok(BackgroundAttachment::Scroll)
} else if word.try_match("fixed") {
Ok(BackgroundAttachment::Fixed)
} else if word.try_match("local") {
Ok(BackgroundAttachment::Local)
} else {
Err(word.error())
}
}
}
impl Parse for BlendMode {
fn parse(s: ParseStream) -> syn::Result<Self> {
let word: HyphenWord = s.parse()?;
if word.try_match("normal") {
Ok(BlendMode::Normal)
} else if word.try_match("multiply") {
Ok(BlendMode::Multiply)
} else if word.try_match("screen") {
Ok(BlendMode::Screen)
} else if word.try_match("overlay") {
Ok(BlendMode::Overlay)
} else if word.try_match("darken") {
Ok(BlendMode::Darken)
} else if word.try_match("lighten") {
Ok(BlendMode::Lighten)
} else if word.try_match("color-dodge") {
Ok(BlendMode::ColorDodge)
} else if word.try_match("color-burn") {
Ok(BlendMode::ColorBurn)
} else if word.try_match("hard-light") {
Ok(BlendMode::HardLight)
} else if word.try_match("soft-light") {
Ok(BlendMode::SoftLight)
} else if word.try_match("difference") {
Ok(BlendMode::Difference)
} else if word.try_match("exclusion") {
Ok(BlendMode::Exclusion)
} else if word.try_match("hue") {
Ok(BlendMode::Hue)
} else if word.try_match("saturation") {
Ok(BlendMode::Saturation)
} else if word.try_match("color") {
Ok(BlendMode::Color)
} else if word.try_match("luminosity") {
Ok(BlendMode::Luminosity)
} else {
Err(word.error())
}
}
}
impl Parse for BackgroundImage {
fn parse(s: ParseStream) -> syn::Result<Self> {
let peek = HyphenWord::peek_specific(s);
if peek.as_ref().map(|s| s.as_str()) == Some("url") {
let url;
syn::parenthesized!(url in s);
let url = url.parse::<syn::LitStr>()?;
Ok(BackgroundImage::Url(url.value()))
} else {
let word: HyphenWord = s.parse()?;
word.add_expected("url");
if word.try_match("none") {
Ok(BackgroundImage::None)
} else {
Err(word.error())
}
}
}
}
impl Parse for BackgroundBox {
fn parse(s: ParseStream) -> syn::Result<Self> {
let word: HyphenWord = s.parse()?;
if word.try_match("border-box") {
Ok(BackgroundBox::BorderBox)
} else if word.try_match("padding-box") {
Ok(BackgroundBox::PaddingBox)
} else if word.try_match("content-box") {
Ok(BackgroundBox::ContentBox)
} else {
Err(word.error())
}
}
}
impl Parse for BackgroundPosition {
fn parse(s: ParseStream) -> syn::Result<Self> {
let word: HyphenWord = s.parse()?;
if word.try_match("top") {
Ok(BackgroundPosition::Top)
} else if word.try_match("bottom") {
Ok(BackgroundPosition::Bottom)
} else if word.try_match("left") {
Ok(BackgroundPosition::Left)
} else if word.try_match("right") {
Ok(BackgroundPosition::Right)
} else if word.try_match("center") {
Ok(BackgroundPosition::Center)
} else {
Err(word.error())
}
}
}
impl Parse for BackgroundRepeat {
fn parse(s: ParseStream) -> syn::Result<Self> {
let word: HyphenWord = s.parse()?;
if word.try_match("repeat-x") {
Ok(BackgroundRepeat::RepeatX)
} else if word.try_match("repeat-y") {
Ok(BackgroundRepeat::RepeatY)
} else if let Ok(v) = s.parse() {
Ok(BackgroundRepeat::SingleOrDouble(v))
} else {
word.add_expected("repeat");
word.add_expected("space");
word.add_expected("round");
word.add_expected("no-repeat");
Err(word.error())
}
}
}
impl Parse for BgRepeatPart {
fn parse(s: ParseStream) -> syn::Result<Self> {
let word: HyphenWord = s.parse()?;
if word.try_match("repeat") {
Ok(BgRepeatPart::Repeat)
} else if word.try_match("space") {
Ok(BgRepeatPart::Space)
} else if word.try_match("round") {
Ok(BgRepeatPart::Round)
} else if word.try_match("no-repeat") {
Ok(BgRepeatPart::NoRepeat)
} else {
Err(word.error())
}
}
}
impl Parse for BackgroundSize {
fn parse(s: ParseStream) -> syn::Result<Self> {
let word: HyphenWord = s.parse()?;
if word.try_match("cover") {
Ok(BackgroundSize::Cover)
} else if word.try_match("contain") {
Ok(BackgroundSize::Contain)
} else if let Ok(v) = s.parse() {
Ok(BackgroundSize::SingleOrDouble(v))
} else {
word.add_expected("<length>");
word.add_expected("<percentage>");
word.add_expected("auto");
Err(word.error())
}
}
}
impl Parse for Border {
fn parse(s: ParseStream) -> syn::Result<Self> {
fn line_width_error(span: Span) -> syn::Error {
syn::Error::new(span, "the border width was specified more than once")
}
fn line_style_error(span: Span) -> syn::Error {
syn::Error::new(span, "the border style was specified more than once")
}
fn color_error(span: Span) -> syn::Error {
syn::Error::new(span, "the border color was specified more than once")
}
let mut border = Border::new();
while !(border.is_full() || finished_rule(s)) {
let mut matched_something = false; // prevents an infinite loop when no matches
let width_fork = s.fork();
match width_fork.parse::<LineWidth>() {
Ok(line_width) => {
if border.has_line_width() {
return Err(line_width_error(width_fork.cursor().span()));
}
matched_something = true;
border.line_width = Some(line_width);
s.advance_to(&width_fork);
}
Err(_) => (),
}
let style_fork = s.fork();
match style_fork.parse::<LineStyle>() {
Ok(line_style) => {
if border.has_line_style() {
return Err(line_style_error(style_fork.cursor().span()));
}
matched_something = true;
border.line_style = Some(line_style);
s.advance_to(&style_fork);
}
Err(_) => (),
}
let color_fork = s.fork();
match color_fork.parse::<Color>() {
Ok(color) => {
if border.has_color() {
return Err(color_error(color_fork.cursor().span()));
}
matched_something = true;
border.color = Some(color);
s.advance_to(&color_fork);
}
Err(_) => (),
}
if !(matched_something || finished_rule(s)) {
return Err(syn::Error::new(
s.cursor().span(),
"unexpected input - expected one of border-width, border-style, color",
));
}
}
Ok(border)
}
}
#[test]
fn test_border_color() {
for (input, output) in vec![
("black", Rect::All(Color::Black)),
(
"#fff blue",
Rect::VerticalHorizontal(Color::HexRGB(255, 255, 255), Color::Blue),
),
(
"blue hsl(20, 5%, 100%) white",
Rect::TopHorizontalBottom(Color::Blue, Color::HSL(20.0, 5.0, 100.0), Color::White),
),
(
"hsla(20, 5%, 100%, 0.2) #fff #ccc white",
Rect::TopRightBottomLeft(
Color::HSLA(20.0, 5.0, 100.0, 0.2),
Color::HexRGB(255, 255, 255),
Color::HexRGB(204, 204, 204),
Color::White,
),
),
] {
assert_eq!(syn::parse_str::<Rect<Color>>(input).unwrap(), output);
}
}
#[test]
fn test_border_width() {
for (input, output) in vec![
("1px", BorderWidth::All(LineWidth::Length(Length::Px(1.0)))),
(
"1px 2\"em\"",
BorderWidth::VerticalHorizontal(
LineWidth::Length(Length::Px(1.0)),
LineWidth::Length(Length::Em(2.0)),
),
),
(
"2\"em\" medium thick",
BorderWidth::TopHorizontalBottom(
LineWidth::Length(Length::Em(2.0)),
LineWidth::Medium,
LineWidth::Thick,
),
),
(
"2\"em\" medium 1px thick",
BorderWidth::TopRightBottomLeft(
LineWidth::Length(Length::Em(2.0)),
LineWidth::Medium,
LineWidth::Length(Length::Px(1.0)),
LineWidth::Thick,
),
),
] {
assert_eq!(syn::parse_str::<BorderWidth>(input).unwrap(), output);
}
for input in vec!["thi", "1px 1px 1px 1px 1px"] {
assert!(syn::parse_str::<BorderWidth>(input).is_err());
}
}
impl Parse for BorderCollapse {
fn parse(s: ParseStream) -> syn::Result<Self> {
let word: HyphenWord = s.parse()?;
if word.try_match("collapse") {
Ok(BorderCollapse::Collapse)
} else if word.try_match("separate") {
Ok(BorderCollapse::Separate)
} else {
Err(word.error())
}
}
}
impl Parse for BoxShadow {
fn parse(s: ParseStream) -> syn::Result<Self> {
syn::custom_keyword!(none);
if s.peek(none) {
s.parse::<none>()?;
Ok(BoxShadow::None)
} else {
Ok(BoxShadow::Shadows(s.parse()?))
}
}
}
impl Parse for BoxSizing {
fn parse(s: ParseStream) -> syn::Result<Self> {
let word: HyphenWord = s.parse()?;
if word.try_match("border-box") {
Ok(BoxSizing::BorderBox)
} else if word.try_match("content-box") {
Ok(BoxSizing::ContentBox)
} else {
Err(word.error())
}
}
}
impl Parse for Clear {
fn parse(s: ParseStream) -> syn::Result<Self> {
let word: HyphenWord = s.parse()?;
if word.try_match("none") {
Ok(Clear::None)
} else if word.try_match("left") {
Ok(Clear::Left)
} else if word.try_match("right") {
Ok(Clear::Right)
} else if word.try_match("both") {
Ok(Clear::Both)
} else if word.try_match("inline-start") {
Ok(Clear::InlineStart)
} else if word.try_match("inline-end") {
Ok(Clear::InlineEnd)
} else {
Err(word.error())
}
}
}
impl Parse for ColumnCount {
fn parse(s: ParseStream) -> syn::Result<Self> {
if s.peek(syn::LitInt) {
Ok(ColumnCount::Fixed(s.parse::<Integer<u32>>()?.into_inner()))
} else {
let word: HyphenWord = s.parse()?;
word.add_expected("integer");
if word.try_match("auto") {
Ok(ColumnCount::Auto)
} else {
Err(word.error())
}
}
}
}
#[test]
fn test_clear() {
for (input, output) in vec![
("none", Clear::None),
("left", Clear::Left),
("right", Clear::Right),
("both", Clear::Both),
("inline-start", Clear::InlineStart),
("inline-end", Clear::InlineEnd),
] {
assert_eq!(syn::parse_str::<Clear>(input).unwrap(), output);
}
}
impl Parse for Cursor {
fn parse(s: ParseStream) -> syn::Result<Self> {
let word: HyphenWord = s.parse()?;
if word.try_match("auto") {
Ok(Cursor::Auto)
} else if word.try_match("default") {
Ok(Cursor::Default)
} else if word.try_match("none") {
Ok(Cursor::None)
} else if word.try_match("context-menu") {
Ok(Cursor::ContextMenu)
} else if word.try_match("help") {
Ok(Cursor::Help)
} else if word.try_match("pointer") {
Ok(Cursor::Pointer)
} else if word.try_match("progress") {
Ok(Cursor::Progress)
} else if word.try_match("wait") {
Ok(Cursor::Wait)
} else if word.try_match("cell") {
Ok(Cursor::Cell)
} else if word.try_match("crosshair") {
Ok(Cursor::Crosshair)
} else if word.try_match("text") {
Ok(Cursor::Text)
} else if word.try_match("vertical-text") {
Ok(Cursor::VerticalText)
} else if word.try_match("alias") {
Ok(Cursor::Alias)
} else if word.try_match("copy") {
Ok(Cursor::Copy)
} else if word.try_match("move") {
Ok(Cursor::Move)
} else if word.try_match("no-drop") {
Ok(Cursor::NoDrop)
} else if word.try_match("not-allowed") {
Ok(Cursor::NotAllowed)
} else if word.try_match("grab") {
Ok(Cursor::Grab)
} else if word.try_match("grabbing") {
Ok(Cursor::Grabbing)
} else if word.try_match("e-resize") {
Ok(Cursor::EResize)
} else if word.try_match("n-resize") {
Ok(Cursor::NResize)
} else if word.try_match("ne-resize") {
Ok(Cursor::NEResize)
} else if word.try_match("nw-resize") {
Ok(Cursor::NWResize)
} else if word.try_match("s-resize") {
Ok(Cursor::SResize)
} else if word.try_match("se-resize") {
Ok(Cursor::SEResize)
} else if word.try_match("sw-resize") {
Ok(Cursor::SWResize)
} else if word.try_match("w-resize") {
Ok(Cursor::WResize)
} else if word.try_match("ew-resize") {
Ok(Cursor::EWResize)
} else if word.try_match("ns-resize") {
Ok(Cursor::NSResize)
} else if word.try_match("nesw-resize") {
Ok(Cursor::NESWResize)
} else if word.try_match("nwse-resize") {
Ok(Cursor::NWSEResize)
} else if word.try_match("col-resize") {
Ok(Cursor::ColResize)
} else if word.try_match("row-resize") {
Ok(Cursor::RowResize)
} else if word.try_match("all-scroll") {
Ok(Cursor::AllScroll)
} else if word.try_match("zoom-in") {
Ok(Cursor::ZoomIn)
} else if word.try_match("zoom-out") {
Ok(Cursor::ZoomOut)
} else {
Err(word.error())
}
}
}
impl Parse for Display {
fn parse(s: ParseStream) -> syn::Result<Self> {
let word: HyphenWord = s.parse()?;
if word.try_match("block") {
Ok(Display::Block)
} else if word.try_match("flex") {
Ok(Display::Flex)
} else if word.try_match("inline") {
Ok(Display::Inline)
} else {
Err(word.error())
}
}
}
impl Parse for FlexBasis {
fn parse(s: ParseStream) -> syn::Result<Self> {
syn::custom_keyword!(content);
if s.peek(content) {
s.parse::<content>()?;
Ok(FlexBasis::Content)
} else {
let w: Width21 = s.parse()?;
Ok(FlexBasis::Width(w))
}
}
}
impl Parse for FlexDirection {
fn parse(s: ParseStream) -> syn::Result<Self> {
let word: HyphenWord = s.parse()?;
if word.try_match("column") {
Ok(FlexDirection::Column)
} else if word.try_match("row") {
Ok(FlexDirection::Row)
} else {
Err(word.error())
}
}
}
impl Parse for FlexWrap {
fn parse(s: ParseStream) -> syn::Result<Self> {
let word: HyphenWord = s.parse()?;
if word.try_match("wrap") {
Ok(FlexWrap::Wrap)
} else if word.try_match("nowrap") {
Ok(FlexWrap::Nowrap)
} else {
Err(word.error())
}
}
}
impl Parse for Float {
fn parse(s: ParseStream) -> syn::Result<Self> {
let word: HyphenWord = s.parse()?;
if word.try_match("none") {
Ok(Float::None)
} else if word.try_match("left") {
Ok(Float::Left)
} else if word.try_match("right") {
Ok(Float::Right)
} else if word.try_match("inline-start") {
Ok(Float::InlineStart)
} else if word.try_match("inline-end") {
Ok(Float::InlineEnd)
} else {
Err(word.error())
}
}
}
impl Parse for Font {
fn parse(s: ParseStream) -> syn::Result<Self> {
if s.peek(syn::LitStr) {
Ok(Font::Named(s.parse::<syn::LitStr>()?.value()))
} else {
let name: HyphenWord = s.parse()?;
name.add_expected("named font");
if name.try_match("serif") {
Ok(Font::Serif)
} else if name.try_match("sans-serif") {
Ok(Font::SansSerif)
} else if name.try_match("cursive") {
Ok(Font::Cursive)
} else if name.try_match("fantasy") {
Ok(Font::Fantasy)
} else if name.try_match("monospace") {
Ok(Font::Fantasy)
} else {
Err(name.error())
}
}
}
}
#[test]
fn test_font_family() {
for (input, output) in vec![
(
"cursive",
FontFamily {
first: Font::Cursive,
rest: vec![],
},
),
(
"\"Amatic SC\", sans-serif",
FontFamily {
first: Font::Named("Amatic SC".to_string()),
rest: vec![Font::SansSerif],
},
),
] {
assert_eq!(syn::parse_str::<FontFamily>(input).unwrap(), output);
}
for val in vec![
"font-family:\"Font Awesome 5 Free\"",
"font-family:\"Some Name\",\"Another Name\",serif",
] {
assert_eq!(&syn::parse_str::<Style>(val).unwrap().to_string(), val);
}
}
impl Parse for FontSize {
fn parse(s: ParseStream) -> syn::Result<Self> {
let word_fork = s.fork();
let name: HyphenWord = word_fork.parse()?;
if name.try_match("xx-small") {
s.advance_to(&word_fork);
Ok(FontSize::XXSmall)
} else if name.try_match("x-small") {
s.advance_to(&word_fork);
Ok(FontSize::XSmall)
} else if name.try_match("small") {
s.advance_to(&word_fork);
Ok(FontSize::Small)
} else if name.try_match("medium") {
s.advance_to(&word_fork);
Ok(FontSize::Medium)
} else if name.try_match("large") {
s.advance_to(&word_fork);
Ok(FontSize::Large)
} else if name.try_match("x-large") {
s.advance_to(&word_fork);
Ok(FontSize::XLarge)
} else if name.try_match("xx-large") {
s.advance_to(&word_fork);
Ok(FontSize::XXLarge)
} else if name.try_match("xxx-large") {
s.advance_to(&word_fork);
Ok(FontSize::XXXLarge)
} else if name.try_match("larger") {
s.advance_to(&word_fork);
Ok(FontSize::Larger)
} else if name.try_match("smaller") {
s.advance_to(&word_fork);
Ok(FontSize::Smaller)
} else {
s.parse().map(FontSize::LengthPercentage).map_err(|_| {
name.add_expected("length");
name.add_expected("percentage");
name.error()
})
}
}
}
impl Parse for FontStyle {
fn parse(s: ParseStream) -> syn::Result<Self> {
let name: HyphenWord = s.parse()?;
if name.try_match("normal") {
Ok(FontStyle::Normal)
} else if name.try_match("italic") {
Ok(FontStyle::Italic)
} else if name.try_match("oblique") {
Ok(FontStyle::Oblique)
} else {
Err(name.error())
}
}
}
#[test]
fn test_font_style() {
for (input, output) in vec![
("normal", FontStyle::Normal),
("italic", FontStyle::Italic),
("oblique", FontStyle::Oblique),
] {
assert_eq!(syn::parse_str::<FontStyle>(input).unwrap(), output);
}
for input in vec!["norma", "normal trailing"] {
assert!(syn::parse_str::<FontStyle>(input).is_err());
}
}
impl Parse for FontWeight {
fn parse(s: ParseStream) -> syn::Result<Self> {
let name: HyphenWord = s.parse()?;
name.add_expected("number where 1 <= number <= 1000");
if name.try_match("normal") {
Ok(FontWeight::Normal)
} else if name.try_match("bold") {
Ok(FontWeight::Bold)
} else if name.try_match("lighter") {
Ok(FontWeight::Lighter)
} else if name.try_match("bolder") {
Ok(FontWeight::Bolder)
} else {
let n: Number = s.parse().map_err(|_| name.error())?;
if n.suffix.is_empty() && n.value >= 1.0 && n.value <= 1000.0 {
Ok(FontWeight::Number(n.value))
} else {
Err(name.error())
}
}
}
}
#[test]
fn test_font_weight() {
for (input, output) in vec![
("normal", FontWeight::Normal),
("bold", FontWeight::Bold),
("lighter", FontWeight::Lighter),
("bolder", FontWeight::Bolder),
("1", FontWeight::Number(1.0)),
("1.0", FontWeight::Number(1.0)),
("1000", FontWeight::Number(1000.0)),
("1000.0", FontWeight::Number(1000.0)),
("246.15", FontWeight::Number(246.15)),
] {
match syn::parse_str::<FontWeight>(input) {
Ok(v) => assert_eq!(v, output),
Err(e) => panic!("error parsing {}: {}", input, e),
}
}
}
impl Parse for JustifyContent {
fn parse(s: ParseStream) -> syn::Result<Self> {
let name: HyphenWord = s.parse()?;
if name.try_match("flex-start") {
Ok(JustifyContent::FlexStart)
} else if name.try_match("flex-end") {
Ok(JustifyContent::FlexEnd)
} else if name.try_match("center") {
Ok(JustifyContent::Center)
} else if name.try_match("space-between") {
Ok(JustifyContent::SpaceBetween)
} else if name.try_match("space-around") {
Ok(JustifyContent::SpaceAround)
} else if name.try_match("start") {
// - not in level 1 spec
Ok(JustifyContent::FlexStart)
} else if name.try_match("end") {
// - not in level 1 spec
Ok(JustifyContent::FlexEnd)
} else {
Err(name.error())
}
}
}
impl Parse for Length {
fn parse(s: ParseStream) -> syn::Result<Self> {
let neg = if s.peek(Token![-]) {
s.parse::<Token![-]>()?;
true
} else {
false
};
let n: Number = s.parse()?;
Length::parse_from_number(n, neg)
}
}
impl Length {
fn parse_from_number(n: Number, neg: bool) -> syn::Result<Self> {
let neg = if neg { -1.0 } else { 1.0 };
if n.suffix == "em" {
Ok(Length::Em(n.value * neg))
} else if n.suffix == "ex" {
Ok(Length::Ex(n.value * neg))
} else if n.suffix == "in" {
Ok(Length::In(n.value * neg))
} else if n.suffix == "cm" {
Ok(Length::Cm(n.value * neg))
} else if n.suffix == "mm" {
Ok(Length::Mm(n.value * neg))
} else if n.suffix == "pt" {
Ok(Length::Pt(n.value * neg))
} else if n.suffix == "pc" {
Ok(Length::Pc(n.value * neg))
} else if n.suffix == "px" {
Ok(Length::Px(n.value * neg))
} else if n.suffix == "" && n.value == 0.0 {
Ok(Length::Zero)
} else {
// No matches so return error
Err(syn::Error::new(
n.span,
"expected one of `\"em\"`, `\"ex\"`, `in`, `cm`, `mm`, `pt`, `pc`, `px` after number, or 0",
))
}
}
}
impl Parse for LineStyle {
fn parse(s: ParseStream) -> syn::Result<Self> {
let name = s.parse::<HyphenWord>()?;
if name.try_match("none") {
Ok(LineStyle::None)
} else if name.try_match("hidden") {
Ok(LineStyle::Hidden)
} else if name.try_match("dotted") {
Ok(LineStyle::Dotted)
} else if name.try_match("dashed") {
Ok(LineStyle::Dashed)
} else if name.try_match("solid") {
Ok(LineStyle::Solid)
} else if name.try_match("double") {
Ok(LineStyle::Double)
} else if name.try_match("groove") {
Ok(LineStyle::Groove)
} else if name.try_match("ridge") {
Ok(LineStyle::Ridge)
} else if name.try_match("inset") {
Ok(LineStyle::Inset)
} else if name.try_match("outset") {
Ok(LineStyle::Outset)
} else {
Err(name.error())
}
}
}
impl Parse for LineWidth {
fn parse(s: ParseStream) -> syn::Result<Self> {
let name = s.parse::<HyphenWord>()?;
if name.try_match("thin") {
Ok(LineWidth::Thin)
} else if name.try_match("medium") {
Ok(LineWidth::Medium)
} else if name.try_match("thick") {
Ok(LineWidth::Thick)
} else {
match s.parse::<Length>() {
Ok(l) => Ok(LineWidth::Length(l)),
Err(_) => {
name.add_expected("length");
Err(name.error())
}
}
}
}
}
#[test]
fn test_parse_line_width() {
assert_eq!(
syn::parse_str::<LineWidth>("thin").unwrap(),
LineWidth::Thin
);
}
impl Parse for LineHeight {
fn parse(s: ParseStream) -> syn::Result<Self> {
Ok(LineHeight(s.parse::<syn::LitFloat>()?.base10_parse()?))
}
}
impl Parse for ListStyleType {
fn parse(s: ParseStream) -> syn::Result<Self> {
let name: HyphenWord = s.parse()?;
if name.try_match("disc") {
Ok(ListStyleType::Disc)
} else if name.try_match("circle") {
Ok(ListStyleType::Circle)
} else if name.try_match("square") {
Ok(ListStyleType::Square)
} else if name.try_match("decimal") {
Ok(ListStyleType::Decimal)
} else if name.try_match("decimal-leading-zero") {
Ok(ListStyleType::DecimalLeadingZero)
} else if name.try_match("lower-roman") {
Ok(ListStyleType::LowerRoman)
} else if name.try_match("upper-roman") {
Ok(ListStyleType::UpperRoman)
} else if name.try_match("lower-greek") {
Ok(ListStyleType::LowerGreek)
} else if name.try_match("upper-greek") {
Ok(ListStyleType::UpperGreek)
} else if name.try_match("lower-latin") {
Ok(ListStyleType::LowerLatin)
} else if name.try_match("upper-latin") {
Ok(ListStyleType::UpperLatin)
} else if name.try_match("armenian") {
Ok(ListStyleType::Armenian)
} else if name.try_match("georgian") {
Ok(ListStyleType::Georgian)
} else if name.try_match("lower-alpha") {
Ok(ListStyleType::LowerAlpha)
} else if name.try_match("upper-alpha") {
Ok(ListStyleType::UpperAlpha)
} else if name.try_match("none") {
Ok(ListStyleType::None)
} else {
Err(name.error())
}
}
}
impl Parse for MaxWidthHeight {
fn parse(s: ParseStream) -> syn::Result<Self> {
let name = s.parse::<HyphenWord>()?;
name.add_expected("length");
name.add_expected("percentage");
if name.try_match("none") {
Ok(MaxWidthHeight::None)
} else if name.try_match("min-content") {
Ok(MaxWidthHeight::MinContent)
} else if name.try_match("max-content") {
Ok(MaxWidthHeight::MaxContent)
} else if name.try_match("fit-content") {
let content;
syn::parenthesized!(content in s);
Ok(MaxWidthHeight::FitContent(content.parse()?))
} else {
s.parse()
.map(|lp| MaxWidthHeight::LengthPercentage(lp))
.map_err(|_| name.error())
}
}
}
#[test]
fn test_max_width_height() {
let style: Style = syn::parse_str("max-width: 200px").unwrap();
assert_eq!(&style.to_string(), "max-width:200px");
}
impl<T> Parse for Rect<T>
where
T: Parse,
{
fn parse(s: ParseStream) -> syn::Result<Self> {
let first = s.parse::<T>()?;
let fork = s.fork();
let second = match fork.parse::<T>() {
Ok(v) => {
s.advance_to(&fork);
v
}
Err(_) => return Ok(Rect::All(first)),
};
let third = match fork.parse::<T>() {
Ok(v) => {
s.advance_to(&fork);
v
}
Err(_) => return Ok(Rect::VerticalHorizontal(first, second)),
};
match fork.parse::<T>() {
Ok(v) => {
s.advance_to(&fork);
Ok(Rect::TopRightBottomLeft(first, second, third, v))
}
Err(_) => Ok(Rect::TopHorizontalBottom(first, second, third)),
}
}
}
impl Parse for AutoLengthPercentage {
fn parse(s: ParseStream) -> syn::Result<Self> {
syn::custom_keyword!(auto);
if s.peek(auto) {
s.parse::<auto>()?;
Ok(AutoLengthPercentage::Auto)
} else {
Ok(AutoLengthPercentage::LengthPercentage(s.parse()?))
}
}
}
impl Parse for ObjectFit {
fn parse(s: ParseStream) -> syn::Result<Self> {
let name: HyphenWord = s.parse()?;
if name.try_match("fill") {
Ok(ObjectFit::Fill)
} else if name.try_match("none") {
Ok(ObjectFit::None)
} else if name.try_match("contain") {
if s.is_empty() {
Ok(ObjectFit::Contain { scale_down: false })
} else {
let scale_down_word: HyphenWord = s.parse()?;
if scale_down_word.try_match("scale-down") {
Ok(ObjectFit::Contain { scale_down: true })
} else {
Err(scale_down_word.error())
}
}
} else if name.try_match("cover") {
if HyphenWord::peek(s) {
let scale_down_word: HyphenWord = s.parse()?;
if scale_down_word.try_match("scale-down") {
Ok(ObjectFit::Cover { scale_down: true })
} else {
Err(scale_down_word.error())
}
} else {
Ok(ObjectFit::Cover { scale_down: false })
}
} else if name.try_match("scale-down") {
if HyphenWord::peek(s) {
let cover_contain: HyphenWord = s.parse()?;
if cover_contain.try_match("cover") {
Ok(ObjectFit::Cover { scale_down: true })
} else if cover_contain.try_match("contain") {
Ok(ObjectFit::Contain { scale_down: true })
} else {
Err(cover_contain.error())
}
} else {
// defaults to contain when cover/contain not present
Ok(ObjectFit::Contain { scale_down: true })
}
} else {
Err(name.error())
}
}
}
impl Parse for Overflow {
fn parse(s: ParseStream) -> syn::Result<Self> {
let first = s.parse::<OverflowXY>()?;
Ok(match s.parse::<OverflowXY>() {
Ok(second) => Overflow::XY(first, second),
Err(_) => Overflow::Both(first),
})
}
}
impl Parse for OverflowXY {
fn parse(s: ParseStream) -> syn::Result<Self> {
let name: HyphenWord = s.parse()?;
if name.try_match("visible") {
Ok(OverflowXY::Visible)
} else if name.try_match("hidden") {
Ok(OverflowXY::Hidden)
} else if name.try_match("clip") {
Ok(OverflowXY::Clip)
} else if name.try_match("scroll") {
Ok(OverflowXY::Scroll)
} else if name.try_match("auto") {
Ok(OverflowXY::Auto)
} else {
Err(name.error())
}
}
}
impl Parse for Position {
fn parse(s: ParseStream) -> syn::Result<Self> {
let name: HyphenWord = s.parse()?;
if name.try_match("static") {
Ok(Position::Static)
} else if name.try_match("relative") {
Ok(Position::Relative)
} else if name.try_match("absolute") {
Ok(Position::Absolute)
} else if name.try_match("fixed") {
Ok(Position::Fixed)
} else {
Err(name.error())
}
}
}
#[test]
fn test_padding() {
for (input, output) in vec![(
"padding:1\"em\"",
Style::Padding(Padding::All(Calc::Normal(LengthPercentage::Length(
Length::Em(1.0),
)))),
)] {
assert_eq!(syn::parse_str::<Style>(input).unwrap(), output);
}
}
impl Parse for Percentage {
fn parse(s: ParseStream) -> syn::Result<Self> {
let n: Number = s.parse()?;
if n.suffix == "%" {
Ok(Percentage(n.value))
} else {
Err(syn::Error::new(n.span, "expected percentage"))
}
}
}
impl Parse for WhiteSpace {
fn parse(s: ParseStream) -> syn::Result<Self> {
let name: HyphenWord = s.parse()?;
if name.try_match("normal") {
Ok(WhiteSpace::Normal)
} else if name.try_match("pre") {
Ok(WhiteSpace::Pre)
} else if name.try_match("nowrap") {
Ok(WhiteSpace::Nowrap)
} else if name.try_match("pre-wrap") {
Ok(WhiteSpace::PreWrap)
} else if name.try_match("pre-line") {
Ok(WhiteSpace::PreLine)
} else {
Err(name.error())
}
}
}
impl Parse for Width21 {
fn parse(s: ParseStream) -> syn::Result<Self> {
syn::custom_keyword!(auto);
if s.peek(auto) {
s.parse::<auto>()?;
Ok(Width21::Auto)
} else {
Ok(Width21::LengthPercentage(s.parse()?))
}
}
}
impl Parse for WidthHeight {
fn parse(s: ParseStream) -> syn::Result<Self> {
let fork = s.fork();
let name: HyphenWord = fork.parse()?;
if name.try_match("auto") {
s.advance_to(&fork);
Ok(WidthHeight::Auto)
} else if name.try_match("min-content") {
s.advance_to(&fork);
Ok(WidthHeight::MinContent)
} else if name.try_match("max-content") {
s.advance_to(&fork);
Ok(WidthHeight::MaxContent)
} else if name.try_match("fit-content") {
s.advance_to(&fork);
let content;
syn::parenthesized!(content in s);
let lp = content.parse()?;
if !content.is_empty() {
Err(content.error("trailing tokens"))
} else {
Ok(WidthHeight::FitContent(lp))
}
} else {
// todo error message
Ok(WidthHeight::LengthPercentage(s.parse()?))
}
}
}
#[test]
fn test_width_height() {
for (input, output) in vec![
("0", "0"),
("1px", "1px"),
("1\"em\"", "1em"),
("calc(100% - 60px)", "calc(100% - 60px)"),
] {
match syn::parse_str::<WidthHeight>(input) {
Ok(v) => assert_eq!(&v.to_string(), output),
Err(e) => panic!("Error in \"{}\": {}", input, e),
}
}
}
impl Parse for LengthPercentage {
fn parse(s: ParseStream) -> syn::Result<Self> {
if s.peek2(Token![%]) {
Ok(LengthPercentage::Percentage(s.parse()?))
} else {
Ok(LengthPercentage::Length(s.parse()?))
}
}
}
#[test]
fn test_length_percentage() {
for (input, output) in vec![
("1\"em\"", LengthPercentage::Length(Length::Em(1.0))),
("1.0px", LengthPercentage::Length(Length::Px(1.0))),
("0", LengthPercentage::Length(Length::Zero)),
] {
assert_eq!(syn::parse_str::<LengthPercentage>(input).unwrap(), output);
}
}
impl Parse for Resize {
fn parse(s: ParseStream) -> syn::Result<Self> {
let name: HyphenWord = s.parse()?;
if name.try_match("none") {
Ok(Resize::None)
} else if name.try_match("both") {
Ok(Resize::Both)
} else if name.try_match("horizontal") {
Ok(Resize::Horizontal)
} else if name.try_match("vertical") {
Ok(Resize::Vertical)
} else {
Err(name.error())
}
}
}
impl Parse for Shadow {
fn parse(s: ParseStream) -> syn::Result<Self> {
syn::custom_keyword!(inset);
let mut inset_val = false;
let mut length: Option<ShadowLength> = None;
let mut color: Option<Color> = None;
// keep trying all three until we're done or there is an error
loop {
let mut parsed_something = false;
// inset (easiest)
if s.peek(inset) {
let inset_tok = s.parse::<inset>()?;
if inset_val {
return Err(syn::Error::new(
inset_tok.span(),
"`inset` must be specified 0 or 1 times",
));
}
inset_val = true;
parsed_something = true;
}
// color
let fork = s.fork();
if let Ok(parsed_color) = fork.parse::<Color>() {
if color.is_some() {
return Err(s.error("color must be specified 0 or 1 times"));
}
color = Some(parsed_color);
s.advance_to(&fork);
parsed_something = true;
}
// length
let fork = s.fork();
if let Ok(parsed_length) = fork.parse::<ShadowLength>() {
if length.is_some() {
return Err(s.error("shadow length must be specified once"));
}
length = Some(parsed_length);
s.advance_to(&fork);
parsed_something = true;
}
// if we've failed to parse anything, end the loop.
if !parsed_something {
break;
}
}
if let Some(length) = length {
Ok(Shadow {
color,
length,
inset: inset_val,
})
} else {
Err(s.error("expected color, length, or `inset`"))
}
}
}
impl Parse for ShadowLength {
fn parse(s: ParseStream) -> syn::Result<Self> {
let horizontal: Length = s.parse()?;
let vertical: Length = s.parse()?;
// blur
let fork = s.fork();
let blur = match fork.parse::<Length>() {
Ok(blur) => {
s.advance_to(&fork);
blur
}
Err(_) => {
return Ok(ShadowLength::Offsets {
horizontal,
vertical,
});
}
};
// spread
let fork = s.fork();
match fork.parse::<Length>() {
Ok(spread) => {
s.advance_to(&fork);
Ok(ShadowLength::OffsetsBlurSpread {
horizontal,
vertical,
blur,
spread,
})
}
Err(_) => Ok(ShadowLength::OffsetsBlur {
horizontal,
vertical,
blur,
}),
}
}
}
impl Parse for TextAlign {
fn parse(s: ParseStream) -> syn::Result<Self> {
let word: HyphenWord = s.parse()?;
if word.try_match("left") {
Ok(TextAlign::Left)
} else if word.try_match("right") {
Ok(TextAlign::Right)
} else if word.try_match("center") {
Ok(TextAlign::Center)
} else if word.try_match("justify") {
Ok(TextAlign::Justify)
} else {
Err(word.error())
}
}
}
// color
// =====
impl Parse for DynamicColor {
fn parse(s: ParseStream) -> syn::Result<Self> {
Ok(if s.peek(syn::token::Brace) {
DynamicColor::Dynamic(s.parse()?)
} else {
DynamicColor::Literal(s.parse()?)
})
}
}
impl Parse for Color {
fn parse(s: ParseStream) -> syn::Result<Self> {
if s.peek(Token![#]) {
return parse_hex_color(s);
}
let fn_name: HyphenWord = s.parse()?;
if fn_name.try_match("hsl") {
parse_hsl_color(s, false)
} else if fn_name.try_match("hsla") {
parse_hsl_color(s, true)
} else {
if let Some(name) = fn_name.word.as_ref() {
if let Some(color) = Color::from_named(name) {
return Ok(color);
}
}
fn_name.add_expected("named color");
Err(fn_name.error())
}
}
}
fn parse_hex_color(s: ParseStream) -> syn::Result<Color> {
const ERR_MSG: &'static str = "to avoid confusing rust, please enclose hex colors in `\"`";
s.parse::<Token![#]>()?;
if !(s.peek(syn::LitStr) || s.peek(Ident)) {
return Err(s.error(ERR_MSG));
}
if s.peek(syn::LitStr) {
let hex_str: syn::LitStr = s.parse()?;
color::parse_hex(&hex_str.value()).ok_or(syn::Error::new(hex_str.span(), ERR_MSG))
} else {
let hex_str: Ident = s.parse()?;
color::parse_hex(&hex_str.to_string()).ok_or(syn::Error::new(hex_str.span(), ERR_MSG))
}
}
fn parse_hsl_color(s: ParseStream, with_alpha: bool) -> syn::Result<Color> {
let content;
syn::parenthesized!(content in s);
let n: Number = content.parse()?;
n.empty_suffix()?;
let hue = n.value;
if hue < 0.0 || hue >= 360.0 {
return Err(syn::Error::new(
n.span,
"hue should be in the range `0 <= hue < 360`",
));
}
content.parse::<Token![,]>()?;
let n: Number = content.parse()?;
if n.suffix != "%" {
return Err(syn::Error::new(
n.span,
"saturation should be a percentage (followed by `%`)",
));
}
let sat = n.value;
if sat < 0.0 || sat > 100.0 {
return Err(syn::Error::new(
n.span,
"saturation should be in the range `0 <= sat < 100`",
));
}
content.parse::<Token![,]>()?;
let n: Number = content.parse()?;
if n.suffix != "%" {
return Err(syn::Error::new(
n.span,
"saturation should be a percentage (followed by `%`)",
));
}
let light = n.value;
if light < 0.0 || light > 100.0 {
return Err(syn::Error::new(
n.span,
"lightness should be in the range `0 <= light < 100`",
));
}
// since we parse content in parentheses, we can assume no trailing characers
if !with_alpha {
return if content.is_empty() {
Ok(Color::HSL(hue, sat, light))
} else {
Err(content.error("trailing characters"))
};
}
// we are a hsla
content.parse::<Token![,]>()?;
let n: Number = content.parse()?;
n.empty_suffix()?;
let alpha = n.value;
if alpha < 0.0 || alpha > 1.0 {
return Err(syn::Error::new(
n.span,
"alpha should be in the range `0 <= alpha < 1`",
));
}
if content.is_empty() {
Ok(Color::HSLA(hue, sat, light, alpha))
} else {
Err(content.error("unexpected trailing characters"))
}
}
#[test]
fn test_color() {
for (input, output) in vec![
("#ffffffff", Color::HexRGBA(255, 255, 255, 255)),
("#ffffff", Color::HexRGB(255, 255, 255)),
("#fff", Color::HexRGB(255, 255, 255)),
("#\"fff\"", Color::HexRGB(255, 255, 255)),
("hsl(100, 50%, 50%)", Color::HSL(100.0, 50.0, 50.0)),
("hsla(60, 0%, 0%, 0.2)", Color::HSLA(60.0, 0.0, 0.0, 0.2)),
("black", Color::Black),
("yellow", Color::Yellow),
] {
match syn::parse_str::<Color>(input) {
Ok(c) => assert_eq!(c, output),
Err(e) => panic!("error parsing color {}: {}", input, e),
}
}
}
// Util
// ====
impl<T> Parse for NonemptyCommaList<T>
where
T: Parse,
{
fn parse(s: ParseStream) -> syn::Result<Self> {
let punctuated = Punctuated::<T, Token![,]>::parse_separated_nonempty(s)?;
let mut iter = punctuated.into_iter();
let first = iter.next().unwrap();
Ok(Self {
first,
rest: iter.collect(),
})
}
}
impl<T> Parse for SingleOrDouble<T>
where
T: Parse,
{
fn parse(s: ParseStream) -> syn::Result<Self> {
let first = T::parse(s)?;
let fork = s.fork();
Ok(match T::parse(&fork) {
Ok(second) => {
s.advance_to(&fork);
SingleOrDouble::Double {
vert: first,
horiz: second,
}
}
Err(_) => SingleOrDouble::Single(first),
})
}
}
/// Either a float or an int, converted in either case to f64.
///
/// A trailing percent (`%`) character will be consumed if the number has no suffix. This is valid
/// according to the CSS tokeniser spec.
///
/// TODO This only works for floats for now. Although JS only supports floats, integer literals are
/// used in css.
#[derive(Debug)]
struct Number {
value: f64,
suffix: String,
span: Span,
}
impl Number {
fn empty_suffix(&self) -> syn::Result<()> {
if self.suffix != "" {
Err(syn::Error::new(
self.span,
"unexpected characters after number",
))
} else {
Ok(())
}
}
#[cfg(test)]
fn check_value(&self, value: f64, suffix: &str) -> bool {
self.value == value && self.suffix == suffix
}
}
impl Parse for Number {
fn parse(s: ParseStream) -> syn::Result<Number> {
let lookahead = s.lookahead1();
let (value, mut span, mut suffix) = if lookahead.peek(syn::LitFloat) {
let tok = s.parse::<syn::LitFloat>()?;
let num = tok.base10_parse()?;
(num, tok.span(), tok.suffix().to_string())
} else if lookahead.peek(syn::LitInt) {
let tok = s.parse::<syn::LitInt>()?;
// u32 chosen because it can be safely converted into f64
let num = tok.base10_parse::<u32>()?;
(num.into(), tok.span(), tok.suffix().to_string())
} else {
return Err(lookahead.error());
};
if suffix.is_empty() {
// look for a `%` for the suffix
if s.peek(Token![%]) {
let tok = s.parse::<Token![%]>()?;
if let Some(extra_span) = span.join(tok.span) {
span = extra_span;
}
suffix.push('%');
// work-around using literal strings because the lexer can't support suffixes beginning
// with `e` for floats: https://github.com/rust-lang/rust/issues/67544
} else if s.peek(syn::LitStr) {
let tok = s.parse::<syn::LitStr>()?;
if let Some(extra_span) = span.join(tok.span()) {
span = extra_span;
}
suffix.push_str(&tok.value());
}
}
Ok(Number {
value,
suffix,
span,
})
}
}
#[test]
fn test_number() {
for (input, value, suffix) in vec![
("200", 200.0, ""),
("200.0", 200.0, ""),
("0", 0.0, ""),
("0in", 0.0, "in"),
] {
assert!(syn::parse_str::<Number>(input)
.unwrap()
.check_value(value, suffix),)
}
}
/// Something like `word-separated-hyphens`
#[derive(Debug)]
struct HyphenWord {
pub span: Span,
pub word: Option<String>,
/// List of tried matches - for building error.
tried: TryList,
}
impl HyphenWord {
pub fn new(span: Span, word: String) -> Self {
HyphenWord {
span,
word: Some(word),
tried: TryList::new(),
}
}
/// This allows HyphenWords to be empty. In this case the token cursor will not advance and the
/// returned word will be blank.
pub fn new_no_word(span: Span) -> Self {
HyphenWord {
span,
word: None,
tried: TryList::new(),
}
}
pub fn try_match(&self, other: &str) -> bool {
if Some(other) == self.word.as_ref().map(|s| s.as_str()) {
true
} else {
self.tried.add_literal(other);
false
}
}
pub fn add_expected(&self, ty: &str) {
self.tried.add(ty);
}
/// Panics if there were no calls to `try_match` before calling this function.
pub fn error(&self) -> syn::Error {
self.tried.to_error(self.span)
}
/// This is cheaper than peek-specific
pub fn peek(s: ParseStream) -> bool {
s.peek(Ident)
}
/// Peek the next HyphenWord without advancing the parser.
pub fn peek_specific(s: ParseStream) -> Option<String> {
let fork = s.fork();
match HyphenWord::parse(&fork) {
Ok(hw) => Some(hw.word.unwrap()),
Err(_) => None,
}
}
}
impl Parse for HyphenWord {
fn parse(s: ParseStream) -> syn::Result<Self> {
let fork = s.fork();
let first = match fork.call(Ident::parse_any) {
Ok(v) => {
s.advance_to(&fork);
v
}
Err(_) => return Ok(HyphenWord::new_no_word(s.cursor().span())),
};
let mut word = first.to_string();
let mut span = first.span();
// This is potentially unbounded. Probably not be a problem but making a note anyway.
while s.peek(Token![-]) {
let hyphen = s.parse::<Token![-]>()?;
if let Some(joined) = span.join(hyphen.span) {
span = joined;
}
let part = s.call(Ident::parse_any)?;
write!(word, "-{}", part).unwrap();
if let Some(joined) = span.join(part.span()) {
span = joined;
}
}
Ok(HyphenWord::new(span, word))
}
}
#[test]
fn test_hyphen_word() {
let word: HyphenWord = syn::parse_str("first-second-third").unwrap();
assert_eq!(word.word, Some("first-second-third".to_string()));
assert!(syn::parse_str::<HyphenWord>("first-second-").is_err());
assert!(syn::parse_str::<HyphenWord>("a a").is_err());
}
/// Keeps track of a list of tokens that have been tried.
#[derive(Debug)]
pub struct TryList(RefCell<BTreeSet<String>>);
impl TryList {
pub fn new() -> Self {
TryList(RefCell::new(BTreeSet::new()))
}
/// Same as add, but with quotes
pub fn add_literal(&self, lit: &str) {
self.add(format!("`{}`", lit));
}
pub fn add(&self, ty: impl Into<String>) {
self.0.borrow_mut().insert(ty.into());
}
fn to_error(&self, span: Span) -> syn::Error {
let tried = self.0.borrow();
let mut iter = tried.iter();
let start = iter.next().unwrap().to_owned();
let list = iter.fold(start, |mut acc, itm| {
write!(acc, ", {}", itm).unwrap();
acc
});
let error_msg = format!("expected one of {}", list);
syn::Error::new(span, error_msg)
}
}
/// Whether we are at the end of a rule. Either the stream will be empty, or there will be a
/// semi-colon.
fn finished_rule(s: ParseStream) -> bool {
s.is_empty() || s.peek(Token![;])
}
// Parsing integers
#[derive(Debug, PartialEq)]
struct Integer<T> {
value: T,
}
impl<T> Integer<T> {
fn into_inner(self) -> T {
self.value
}
}
impl<T> Parse for Integer<T>
where
T: str::FromStr + fmt::Display + PartialOrd<T>,
<T as str::FromStr>::Err: fmt::Display,
{
fn parse(s: ParseStream) -> syn::Result<Self> {
Ok(Integer {
value: integer(s, ..)?,
})
}
}
/// Parse an integer, with an optional allowed range.
fn integer<T, R>(s: ParseStream, range: R) -> syn::Result<T>
where
R: RangeBounds<T> + fmt::Debug,
T: str::FromStr + fmt::Display + PartialOrd<T>,
<T as str::FromStr>::Err: fmt::Display,
{
let fixed = s.parse::<syn::LitInt>()?;
let span = fixed.span();
if fixed.suffix().is_empty() {
let fixed = fixed.base10_parse()?;
if range.contains(&fixed) {
Ok(fixed)
} else {
Err(syn::Error::new(
span,
format!(
"expected a number in the range {:?}, found {}",
range, fixed
),
))
}
} else {
Err(syn::Error::new(span, "the number should not have a suffix"))
}
}
#[test]
fn test_parse_integer() {
let x: Integer<u8> = syn::parse_str("123").unwrap();
assert_eq!(x.into_inner(), 123);
let x: syn::Result<Integer<u8>> = syn::parse_str("256");
assert!(x.is_err());
}
// tests
#[test]
fn downstream_bug1() {
let s: Styles = syn::parse_str(
"display: flex;
flex-direction: column;
flex-grow: 1;
flex-shrink: 0;",
)
.unwrap();
assert_eq!(
s.rules,
vec![
Style::Display(Display::Flex),
Style::FlexDirection(FlexDirection::Column),
Style::FlexGrow(1.0),
Style::FlexShrink(0.0)
]
)
}
#[test]
#[ignore]
fn inline_logic() {
todo!()
}
#[cfg(test)]
mod tests {
use super::*;
/// Use if you want to test that something parses, but not if it looks the same when
/// stringified. Example "border: 1px" -> "border:1px" but we still might want to check that
/// the former parses.
fn parse(input: &str) -> Style {
syn::parse_str(input).unwrap()
}
/// This function can be used to quickly write tests to check that a parse and a stringify are
/// opposites.
fn round_trip_style(input: &str) {
assert_eq!(&parse(input).to_string(), input);
}
#[test]
fn border_bottom_left_radius() {
round_trip_style("border-bottom-left-radius:30% 3px");
}
#[test]
fn border_bottom_right_radius() {
round_trip_style("border-bottom-right-radius:0 0");
}
#[test]
fn border_collapse() {
round_trip_style("border-collapse:collapse");
}
#[test]
fn border_width() {
round_trip_style("border-width:1px");
round_trip_style("border-width:0 2px 50pt 0");
}
}
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