mirror of
https://github.com/slint-ui/slint.git
synced 2025-09-29 13:24:48 +00:00
336 lines
9.3 KiB
Rust
336 lines
9.3 KiB
Rust
use super::expressions::parse_expression;
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use super::prelude::*;
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use super::statements::parse_statement;
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#[cfg_attr(test, parser_test)]
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/// ```test,Document
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/// Type := Base { }
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/// Type := Base { SubElement { } }
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/// component Comp := Base {} Type := Base {}
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/// ```
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pub fn parse_document(p: &mut impl Parser) -> bool {
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let mut p = p.start_node(SyntaxKind::Document);
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loop {
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if p.peek().as_str() == "component" && p.nth(1) != SyntaxKind::ColonEqual {
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p.expect(SyntaxKind::Identifier);
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}
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if !parse_component(&mut *p) {
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return false;
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}
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if p.nth(0) == SyntaxKind::Eof {
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return true;
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}
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}
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}
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#[cfg_attr(test, parser_test)]
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/// ```test,Component
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/// Type := Base { }
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/// Type := Base { prop: value; }
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/// Type := Base { SubElement { } }
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/// ```
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pub fn parse_component(p: &mut impl Parser) -> bool {
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let mut p = p.start_node(SyntaxKind::Component);
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if !(p.expect(SyntaxKind::Identifier) && p.expect(SyntaxKind::ColonEqual)) {
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return false;
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}
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if !parse_element(&mut *p) {
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return false;
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}
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true
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}
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#[cfg_attr(test, parser_test)]
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/// ```test,Element
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/// Item { }
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/// Item { property: value; SubElement { } }
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/// ```
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pub fn parse_element(p: &mut impl Parser) -> bool {
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let mut p = p.start_node(SyntaxKind::Element);
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if !(parse_qualified_name(&mut *p) && p.expect(SyntaxKind::LBrace)) {
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return false;
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}
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parse_element_content(&mut *p);
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p.expect(SyntaxKind::RBrace)
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}
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#[cfg_attr(test, parser_test)]
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/// ```test
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/// property1: value; property2: value;
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/// sub := Sub { }
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/// for xx in model: Sub {}
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/// if (condition) : Sub {}
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/// clicked => {}
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/// signal foobar;
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/// property<int> width;
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/// animate someProp { }
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/// ```
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fn parse_element_content(p: &mut impl Parser) {
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loop {
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match p.nth(0) {
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SyntaxKind::RBrace => return,
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SyntaxKind::Eof => return,
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SyntaxKind::Identifier => match p.nth(1) {
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SyntaxKind::Colon => parse_property_binding(&mut *p),
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SyntaxKind::ColonEqual | SyntaxKind::LBrace => parse_sub_element(&mut *p),
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SyntaxKind::FatArrow => parse_signal_connection(&mut *p),
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SyntaxKind::Identifier if p.peek().as_str() == "for" => {
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parse_repeated_element(&mut *p);
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}
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SyntaxKind::Identifier if p.peek().as_str() == "signal" => {
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parse_signal_declaration(&mut *p);
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}
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SyntaxKind::Identifier if p.peek().as_str() == "animate" => {
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parse_property_animation(&mut *p);
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}
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SyntaxKind::LAngle if p.peek().as_str() == "property" => {
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parse_property_declaration(&mut *p);
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}
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SyntaxKind::LParent if p.peek().as_str() == "if" => {
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parse_if_element(&mut *p);
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}
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_ => {
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p.consume();
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p.error("FIXME");
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}
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},
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_ => {
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p.consume();
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p.error("FIXME");
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}
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}
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}
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}
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#[cfg_attr(test, parser_test)]
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/// ```test,SubElement
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/// Bar {}
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/// foo := Bar {}
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/// Bar { x : y ; }
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/// ```
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/// Must consume at least one token
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fn parse_sub_element(p: &mut impl Parser) {
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let mut p = p.start_node(SyntaxKind::SubElement);
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if p.nth(1) == SyntaxKind::ColonEqual {
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assert!(p.expect(SyntaxKind::Identifier));
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p.expect(SyntaxKind::ColonEqual);
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}
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parse_element(&mut *p);
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}
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#[cfg_attr(test, parser_test)]
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/// ```test,RepeatedElement
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/// for xx in mm: Elem { }
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/// for [idx] in mm: Elem { }
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/// for xx [idx] in foo.bar: Elem { }
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/// ```
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/// Must consume at least one token
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fn parse_repeated_element(p: &mut impl Parser) {
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debug_assert_eq!(p.peek().as_str(), "for");
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let mut p = p.start_node(SyntaxKind::RepeatedElement);
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p.consume(); // "for"
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if p.nth(0) == SyntaxKind::Identifier {
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let mut p = p.start_node(SyntaxKind::DeclaredIdentifier);
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p.expect(SyntaxKind::Identifier);
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}
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if p.nth(0) == SyntaxKind::LBracket {
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let mut p = p.start_node(SyntaxKind::RepeatedIndex);
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p.expect(SyntaxKind::LBracket);
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p.expect(SyntaxKind::Identifier);
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p.expect(SyntaxKind::RBracket);
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}
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if p.peek().as_str() != "in" {
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p.error("Invalid 'for' syntax: there should be a 'in' token");
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return;
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}
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p.consume(); // "in"
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parse_expression(&mut *p);
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p.expect(SyntaxKind::Colon);
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parse_element(&mut *p);
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}
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/// ```test,ConditionalElement
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/// if (condition) : Elem { }
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/// if (foo ? bar : xx) : Elem { foo:bar; Elem {}}
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/// ```
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/// Must consume at least one token
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fn parse_if_element(p: &mut impl Parser) {
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debug_assert_eq!(p.peek().as_str(), "if");
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let mut p = p.start_node(SyntaxKind::ConditionalElement);
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p.consume(); // "if"
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if !p.expect(SyntaxKind::LParent) {
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return;
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}
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parse_expression(&mut *p);
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if !p.expect(SyntaxKind::RParent) || !p.expect(SyntaxKind::Colon) {
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return;
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}
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parse_element(&mut *p);
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}
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#[cfg_attr(test, parser_test)]
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/// ```test,QualifiedName
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/// Rectangle
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/// MyModule.Rectangle
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/// Deeply.Nested.MyModule.Rectangle
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/// ```
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pub fn parse_qualified_name(p: &mut impl Parser) -> bool {
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let mut p = p.start_node(SyntaxKind::QualifiedName);
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if !p.expect(SyntaxKind::Identifier) {
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return false;
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}
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loop {
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if p.nth(0) != SyntaxKind::Dot {
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break;
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}
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p.consume();
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p.expect(SyntaxKind::Identifier);
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}
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return true;
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}
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#[cfg_attr(test, parser_test)]
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/// ```test,Binding
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/// foo: bar;
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/// foo: {}
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/// ```
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fn parse_property_binding(p: &mut impl Parser) {
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let mut p = p.start_node(SyntaxKind::Binding);
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p.consume();
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p.expect(SyntaxKind::Colon);
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parse_binding_expression(&mut *p);
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}
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#[cfg_attr(test, parser_test)]
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/// ```test,BindingExpression
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/// { }
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/// expression ;
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/// {expression }
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/// {object: 42};
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/// ```
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fn parse_binding_expression(p: &mut impl Parser) {
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let mut p = p.start_node(SyntaxKind::BindingExpression);
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if p.nth(0) == SyntaxKind::LBrace && p.nth(2) != SyntaxKind::Colon {
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parse_code_block(&mut *p);
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p.test(SyntaxKind::Semicolon);
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} else {
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parse_expression(&mut *p);
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p.expect(SyntaxKind::Semicolon);
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}
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}
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#[cfg_attr(test, parser_test)]
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/// ```test,CodeBlock
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/// { }
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/// { expression }
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/// { expression ; expression }
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/// { expression ; expression ; }
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/// { ;;;; }
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/// ```
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fn parse_code_block(p: &mut impl Parser) {
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let mut p = p.start_node(SyntaxKind::CodeBlock);
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p.expect(SyntaxKind::LBrace); // Or assert?
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while p.nth(0) != SyntaxKind::RBrace {
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parse_statement(&mut *p);
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if !p.test(SyntaxKind::Semicolon) {
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break;
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}
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}
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p.expect(SyntaxKind::RBrace);
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}
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#[cfg_attr(test, parser_test)]
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/// ```test,SignalConnection
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/// clicked => {}
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/// ```
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fn parse_signal_connection(p: &mut impl Parser) {
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let mut p = p.start_node(SyntaxKind::SignalConnection);
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p.consume(); // the identifier
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p.expect(SyntaxKind::FatArrow);
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parse_code_block(&mut *p);
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}
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#[cfg_attr(test, parser_test)]
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/// ```test,SignalDeclaration
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/// signal foobar;
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/// ```
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/// Must consume at least one token
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fn parse_signal_declaration(p: &mut impl Parser) {
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debug_assert_eq!(p.peek().as_str(), "signal");
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let mut p = p.start_node(SyntaxKind::SignalDeclaration);
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p.consume(); // "signal"
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{
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let mut p = p.start_node(SyntaxKind::DeclaredIdentifier);
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p.expect(SyntaxKind::Identifier);
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}
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p.expect(SyntaxKind::Semicolon);
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}
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#[cfg_attr(test, parser_test)]
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/// ```test,PropertyDeclaration
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/// property<int> foobar;
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/// property<string> text: "Something";
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/// ```
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fn parse_property_declaration(p: &mut impl Parser) {
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debug_assert_eq!(p.peek().as_str(), "property");
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let mut p = p.start_node(SyntaxKind::PropertyDeclaration);
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p.consume(); // property
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p.expect(SyntaxKind::LAngle);
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parse_qualified_name(&mut *p);
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p.expect(SyntaxKind::RAngle);
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{
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let mut p = p.start_node(SyntaxKind::DeclaredIdentifier);
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p.expect(SyntaxKind::Identifier);
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}
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if p.nth(0) == SyntaxKind::Colon {
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p.consume();
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parse_binding_expression(&mut *p);
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} else {
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p.expect(SyntaxKind::Semicolon);
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}
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}
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#[cfg_attr(test, parser_test)]
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/// ```test,PropertyAnimation
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/// animate x { duration: 1000; }
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/// ```
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fn parse_property_animation(p: &mut impl Parser) {
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debug_assert_eq!(p.peek().as_str(), "animate");
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let mut p = p.start_node(SyntaxKind::PropertyAnimation);
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p.consume(); // animate
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{
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let mut p = p.start_node(SyntaxKind::DeclaredIdentifier);
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p.expect(SyntaxKind::Identifier);
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}
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p.expect(SyntaxKind::LBrace);
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loop {
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match p.nth(0) {
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SyntaxKind::RBrace => {
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p.consume();
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return;
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}
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SyntaxKind::Eof => return,
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SyntaxKind::Identifier => match p.nth(1) {
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SyntaxKind::Colon => parse_property_binding(&mut *p),
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_ => {
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p.consume();
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p.error("Only bindings are allowed in animations");
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}
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},
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_ => {
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p.consume();
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p.error("Only bindings are allowed in animations");
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}
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}
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}
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}
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