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3640cb8b97
Closes #8401 ChangeLog: Callbacks handler no longer need curly-braces. Extra semi-colon is no longer an error.
689 lines
22 KiB
Rust
689 lines
22 KiB
Rust
// Copyright © SixtyFPS GmbH <info@slint.dev>
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// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-Royalty-free-2.0 OR LicenseRef-Slint-Software-3.0
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//! The parser functions for elements and things inside them
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use super::document::parse_qualified_name;
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use super::expressions::parse_expression;
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use super::prelude::*;
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use super::r#type::parse_type;
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use super::statements::parse_statement;
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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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/// Item { if true: Rectangle {} }
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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) {
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return if p.test(SyntaxKind::LBrace) {
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// recover
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parse_element_content(&mut *p);
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p.expect(SyntaxKind::RBrace)
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} else {
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false
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};
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}
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if !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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/// callback foobar;
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/// property<int> width;
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/// animate someProp { }
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/// animate * { }
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/// @children
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/// double_binding <=> element.property;
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/// public pure function foo() {}
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/// changed foo => {}
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/// ```
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pub fn parse_element_content(p: &mut impl Parser) {
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let mut had_parse_error = false;
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loop {
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match p.nth(0).kind() {
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SyntaxKind::RBrace => return,
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SyntaxKind::Eof => return,
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SyntaxKind::Identifier => match p.nth(1).kind() {
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SyntaxKind::Colon => parse_property_binding(&mut *p),
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SyntaxKind::ColonEqual | SyntaxKind::LBrace => {
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had_parse_error |= !parse_sub_element(&mut *p)
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}
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SyntaxKind::FatArrow | SyntaxKind::LParent if p.peek().as_str() != "if" => {
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parse_callback_connection(&mut *p)
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}
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SyntaxKind::DoubleArrow => parse_two_way_binding(&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
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if p.peek().as_str() == "callback"
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|| (p.peek().as_str() == "pure" && p.nth(1).as_str() == "callback") =>
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{
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parse_callback_declaration(&mut *p);
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}
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SyntaxKind::Identifier
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if p.peek().as_str() == "function"
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|| (matches!(p.peek().as_str(), "public" | "pure" | "protected")
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&& p.nth(1).as_str() == "function")
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|| (matches!(p.nth(1).as_str(), "public" | "pure" | "protected")
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&& p.nth(2).as_str() == "function") =>
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{
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parse_function(&mut *p);
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}
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SyntaxKind::Identifier | SyntaxKind::Star if p.peek().as_str() == "animate" => {
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parse_property_animation(&mut *p);
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}
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SyntaxKind::Identifier if p.peek().as_str() == "changed" => {
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parse_changed_callback(&mut *p);
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}
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SyntaxKind::LAngle | SyntaxKind::Identifier if p.peek().as_str() == "property" => {
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parse_property_declaration(&mut *p);
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}
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SyntaxKind::Identifier
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if p.nth(1).as_str() == "property"
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&& matches!(
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p.peek().as_str(),
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"in" | "out" | "in_out" | "in-out" | "private"
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) =>
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{
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parse_property_declaration(&mut *p);
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}
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_ if p.peek().as_str() == "if" => {
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parse_if_element(&mut *p);
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}
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SyntaxKind::LBracket if p.peek().as_str() == "states" => {
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parse_states(&mut *p);
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}
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SyntaxKind::LBracket if p.peek().as_str() == "transitions" => {
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parse_transitions(&mut *p);
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}
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_ => {
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if p.peek().as_str() == "changed" {
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// Try to recover some errors
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parse_changed_callback(&mut *p);
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} else {
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p.consume();
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if !had_parse_error {
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p.error("Parse error");
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had_parse_error = true;
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}
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}
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}
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},
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SyntaxKind::At => {
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let checkpoint = p.checkpoint();
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p.consume();
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if p.peek().as_str() == "children" {
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let mut p =
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p.start_node_at(checkpoint.clone(), SyntaxKind::ChildrenPlaceholder);
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p.consume()
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} else {
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p.test(SyntaxKind::Identifier);
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p.error("Parse error: Expected @children")
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}
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}
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_ => {
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if !had_parse_error {
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p.error("Parse error");
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had_parse_error = true;
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}
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p.consume();
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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) -> bool {
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let mut p = p.start_node(SyntaxKind::SubElement);
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if p.nth(1).kind() == SyntaxKind::ColonEqual {
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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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/// for _ in (xxx()): blah := Elem { 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.expect(SyntaxKind::Identifier); // "for"
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if p.nth(0).kind() == 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).kind() == 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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drop(p.start_node(SyntaxKind::Expression));
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drop(p.start_node(SyntaxKind::SubElement).start_node(SyntaxKind::Element));
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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_sub_element(&mut *p);
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}
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#[cfg_attr(test, parser_test)]
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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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/// if (true) : foo := Elem {}
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/// if true && true : 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.expect(SyntaxKind::Identifier); // "if"
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parse_expression(&mut *p);
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if !p.expect(SyntaxKind::Colon) {
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drop(p.start_node(SyntaxKind::SubElement).start_node(SyntaxKind::Element));
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return;
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}
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parse_sub_element(&mut *p);
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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) -> bool {
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let mut p = p.start_node(SyntaxKind::BindingExpression);
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if p.nth(0).kind() == SyntaxKind::LBrace && p.nth(2).kind() != SyntaxKind::Colon {
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parse_code_block(&mut *p);
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p.test(SyntaxKind::Semicolon);
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true
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} else if parse_expression(&mut *p) {
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p.expect(SyntaxKind::Semicolon)
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} else {
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p.test(SyntaxKind::Semicolon);
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false
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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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pub 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).kind() != SyntaxKind::RBrace {
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if !parse_statement(&mut *p) {
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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,CallbackConnection
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/// clicked => {}
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/// clicked => bar ;
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/// clicked => { foo; } ;
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/// clicked() => { foo; }
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/// mouse_move(x, y) => {}
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/// mouse_move(x, y, ) => { bar; goo; }
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/// ```
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fn parse_callback_connection(p: &mut impl Parser) {
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let mut p = p.start_node(SyntaxKind::CallbackConnection);
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p.consume(); // the identifier
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if p.test(SyntaxKind::LParent) {
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while p.peek().kind() != SyntaxKind::RParent {
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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.test(SyntaxKind::Comma) {
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break;
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}
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}
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p.expect(SyntaxKind::RParent);
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}
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p.expect(SyntaxKind::FatArrow);
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if p.nth(0).kind() == SyntaxKind::LBrace && p.nth(2).kind() != SyntaxKind::Colon {
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parse_code_block(&mut *p);
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p.test(SyntaxKind::Semicolon);
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} else if parse_expression(&mut *p) {
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p.expect(SyntaxKind::Semicolon);
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} else {
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p.test(SyntaxKind::Semicolon);
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}
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}
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#[cfg_attr(test, parser_test)]
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/// ```test,TwoWayBinding
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/// foo <=> bar;
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/// foo <=> bar.xxx;
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/// ```
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fn parse_two_way_binding(p: &mut impl Parser) {
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let mut p = p.start_node(SyntaxKind::TwoWayBinding);
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p.consume(); // the identifier
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p.expect(SyntaxKind::DoubleArrow);
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parse_expression(&mut *p);
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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,CallbackDeclaration
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/// callback foobar;
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/// callback my_callback();
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/// callback foo(int, string);
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/// callback foo(foo: int, string, xx: { a: string });
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/// pure callback one_arg({ a: string, b: string});
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/// callback end_coma(a, b, c,);
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/// callback with_return(a, b) -> int;
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/// callback with_return2({a: string}) -> { a: string };
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/// callback foobar <=> elem.foobar;
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/// ```
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/// Must consume at least one token
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fn parse_callback_declaration(p: &mut impl Parser) {
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let mut p = p.start_node(SyntaxKind::CallbackDeclaration);
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if p.peek().as_str() == "pure" {
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p.consume();
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}
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debug_assert_eq!(p.peek().as_str(), "callback");
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p.expect(SyntaxKind::Identifier); // "callback"
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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.test(SyntaxKind::LParent) {
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while p.peek().kind() != SyntaxKind::RParent {
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{
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let mut p = p.start_node(SyntaxKind::CallbackDeclarationParameter);
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if p.peek().kind() == SyntaxKind::Identifier && p.nth(1).kind() == SyntaxKind::Colon
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{
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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::Colon);
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}
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parse_type(&mut *p);
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}
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if !p.test(SyntaxKind::Comma) {
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break;
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}
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}
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p.expect(SyntaxKind::RParent);
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if p.test(SyntaxKind::Arrow) {
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let mut p = p.start_node(SyntaxKind::ReturnType);
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parse_type(&mut *p);
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}
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if p.peek().kind() == SyntaxKind::DoubleArrow {
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p.error("When declaring a callback alias, one must omit parentheses. e.g. 'callback foo <=> other.bar;'");
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}
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} else if p.test(SyntaxKind::Arrow) {
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// Force callback with return value to also have parentheses, we could remove this
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// restriction in the future
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p.error("Callback with return value must be declared with parentheses e.g. 'callback foo() -> int;'");
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parse_type(&mut *p);
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}
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if p.peek().kind() == SyntaxKind::DoubleArrow {
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let mut p = p.start_node(SyntaxKind::TwoWayBinding);
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p.expect(SyntaxKind::DoubleArrow);
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parse_expression(&mut *p);
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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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/// in property <int> xxx;
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/// property<int> foobar;
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/// property<string> text: "Something";
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/// property<string> text <=> two.way;
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/// property alias <=> two.way;
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/// ```
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fn parse_property_declaration(p: &mut impl Parser) {
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let checkpoint = p.checkpoint();
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while matches!(p.peek().as_str(), "in" | "out" | "in-out" | "in_out" | "private") {
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p.consume();
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}
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if p.peek().as_str() != "property" {
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p.error("Expected 'property' keyword");
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return;
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}
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let mut p = p.start_node_at(checkpoint, SyntaxKind::PropertyDeclaration);
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p.consume(); // property
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if p.test(SyntaxKind::LAngle) {
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parse_type(&mut *p);
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p.expect(SyntaxKind::RAngle);
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} else if p.nth(0).kind() == SyntaxKind::Identifier
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&& p.nth(1).kind() != SyntaxKind::DoubleArrow
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{
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p.error("Missing type. The syntax to declare a property is `property <type> name;`. Only two way bindings can omit the type");
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}
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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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match p.nth(0).kind() {
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SyntaxKind::Colon => {
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p.consume();
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parse_binding_expression(&mut *p);
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}
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SyntaxKind::DoubleArrow => {
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let mut p = p.start_node(SyntaxKind::TwoWayBinding);
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p.consume();
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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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p.expect(SyntaxKind::Semicolon);
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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,PropertyAnimation
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/// animate x { duration: 1000; }
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/// animate x, foo.y { }
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/// animate * { }
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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.expect(SyntaxKind::Identifier); // animate
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if p.nth(0).kind() == SyntaxKind::Star {
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p.consume();
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} else {
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parse_qualified_name(&mut *p);
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while p.nth(0).kind() == SyntaxKind::Comma {
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p.consume();
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parse_qualified_name(&mut *p);
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}
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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).kind() {
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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).kind() {
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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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#[cfg_attr(test, parser_test)]
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/// ```test,PropertyChangedCallback
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/// changed the-property => { x = y; }
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/// ```
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fn parse_changed_callback(p: &mut impl Parser) {
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debug_assert_eq!(p.peek().as_str(), "changed");
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let mut p = p.start_node(SyntaxKind::PropertyChangedCallback);
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p.expect(SyntaxKind::Identifier); // changed
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|
{
|
|
let mut p = p.start_node(SyntaxKind::DeclaredIdentifier);
|
|
p.expect(SyntaxKind::Identifier);
|
|
}
|
|
p.expect(SyntaxKind::FatArrow);
|
|
parse_code_block(&mut *p);
|
|
}
|
|
|
|
#[cfg_attr(test, parser_test)]
|
|
/// ```test,States
|
|
/// states []
|
|
/// states [ foo when bar : { x:y; } another_state : { x:z; }]
|
|
/// ```
|
|
fn parse_states(p: &mut impl Parser) {
|
|
debug_assert_eq!(p.peek().as_str(), "states");
|
|
let mut p = p.start_node(SyntaxKind::States);
|
|
p.expect(SyntaxKind::Identifier); // "states"
|
|
p.expect(SyntaxKind::LBracket);
|
|
while parse_state(&mut *p) {}
|
|
p.expect(SyntaxKind::RBracket);
|
|
}
|
|
|
|
#[cfg_attr(test, parser_test)]
|
|
/// ```test,State
|
|
/// foo : { x: 1px + 2px; aaa.y: {1px + 2px} }
|
|
/// foo when bar == 1: { color: blue; foo.color: red; }
|
|
/// a when b: { color: blue; in { animate color { duration: 120s; } } }
|
|
/// a when b: { out { animate foo.bar { } } foo.bar: 42; }
|
|
/// ```
|
|
fn parse_state(p: &mut impl Parser) -> bool {
|
|
if p.nth(0).kind() != SyntaxKind::Identifier {
|
|
return false;
|
|
}
|
|
let mut p = p.start_node(SyntaxKind::State);
|
|
{
|
|
let mut p = p.start_node(SyntaxKind::DeclaredIdentifier);
|
|
p.expect(SyntaxKind::Identifier);
|
|
}
|
|
if p.peek().as_str() == "when" {
|
|
p.consume();
|
|
parse_expression(&mut *p);
|
|
}
|
|
p.expect(SyntaxKind::Colon);
|
|
if !p.expect(SyntaxKind::LBrace) {
|
|
return false;
|
|
}
|
|
|
|
loop {
|
|
match p.nth(0).kind() {
|
|
SyntaxKind::RBrace => {
|
|
p.consume();
|
|
return true;
|
|
}
|
|
SyntaxKind::Eof => return false,
|
|
_ => {
|
|
if p.nth(1).kind() == SyntaxKind::LBrace
|
|
&& matches!(p.peek().as_str(), "in" | "out" | "in-out" | "in_out")
|
|
{
|
|
let mut p = p.start_node(SyntaxKind::Transition);
|
|
p.consume(); // "in", "out" or "in-out"
|
|
p.expect(SyntaxKind::LBrace);
|
|
if !parse_transition_inner(&mut *p) {
|
|
return false;
|
|
}
|
|
continue;
|
|
};
|
|
let checkpoint = p.checkpoint();
|
|
if !parse_qualified_name(&mut *p)
|
|
|| !p.expect(SyntaxKind::Colon)
|
|
|| !parse_binding_expression(&mut *p)
|
|
{
|
|
p.test(SyntaxKind::RBrace);
|
|
return false;
|
|
}
|
|
let _ = p.start_node_at(checkpoint, SyntaxKind::StatePropertyChange);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#[cfg_attr(test, parser_test)]
|
|
/// ```test,Transitions
|
|
/// transitions []
|
|
/// transitions [in checked: {animate x { duration: 88ms; }} out checked: {animate x { duration: 88ms; }} in-out checked: {animate x { duration: 88ms; }}]
|
|
/// ```
|
|
fn parse_transitions(p: &mut impl Parser) {
|
|
debug_assert_eq!(p.peek().as_str(), "transitions");
|
|
let mut p = p.start_node(SyntaxKind::Transitions);
|
|
p.expect(SyntaxKind::Identifier); // "transitions"
|
|
p.expect(SyntaxKind::LBracket);
|
|
while p.nth(0).kind() != SyntaxKind::RBracket && parse_transition(&mut *p) {}
|
|
p.expect(SyntaxKind::RBracket);
|
|
}
|
|
|
|
#[cfg_attr(test, parser_test)]
|
|
/// ```test,Transition
|
|
/// in pressed : {}
|
|
/// in pressed: { animate x { duration: 88ms; } }
|
|
/// out pressed: { animate x { duration: 88ms; } }
|
|
/// in-out pressed: { animate x { duration: 88ms; } }
|
|
/// ```
|
|
fn parse_transition(p: &mut impl Parser) -> bool {
|
|
if !matches!(p.peek().as_str(), "in" | "out" | "in-out" | "in_out") {
|
|
p.error("Expected 'in', 'out', or 'in-out' to declare a transition");
|
|
return false;
|
|
}
|
|
let mut p = p.start_node(SyntaxKind::Transition);
|
|
p.consume(); // "in", "out" or "in-out"
|
|
{
|
|
let mut p = p.start_node(SyntaxKind::DeclaredIdentifier);
|
|
p.expect(SyntaxKind::Identifier);
|
|
}
|
|
p.expect(SyntaxKind::Colon);
|
|
if !p.expect(SyntaxKind::LBrace) {
|
|
return false;
|
|
}
|
|
parse_transition_inner(&mut *p)
|
|
}
|
|
|
|
#[cfg_attr(test, parser_test)]
|
|
/// ```test
|
|
/// }
|
|
/// animate x { duration: 88ms; } animate foo.bar { } }
|
|
/// ```
|
|
fn parse_transition_inner(p: &mut impl Parser) -> bool {
|
|
loop {
|
|
match p.nth(0).kind() {
|
|
SyntaxKind::RBrace => {
|
|
p.consume();
|
|
return true;
|
|
}
|
|
SyntaxKind::Eof => return false,
|
|
SyntaxKind::Identifier if p.peek().as_str() == "animate" => {
|
|
parse_property_animation(&mut *p);
|
|
}
|
|
_ => {
|
|
p.consume();
|
|
p.error("Expected 'animate'");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#[cfg_attr(test, parser_test)]
|
|
/// ```test,Function
|
|
/// function foo() {}
|
|
/// function bar(xx : int) { yy = xx; }
|
|
/// function bar(xx : int,) -> int { return 42; }
|
|
/// public function aa(x: int, b: {a: int}, c: int) {}
|
|
/// protected pure function fff() {}
|
|
/// ```
|
|
fn parse_function(p: &mut impl Parser) {
|
|
let mut p = p.start_node(SyntaxKind::Function);
|
|
if matches!(p.peek().as_str(), "public" | "protected") {
|
|
p.consume();
|
|
if p.peek().as_str() == "pure" {
|
|
p.consume()
|
|
}
|
|
} else if p.peek().as_str() == "pure" {
|
|
p.consume();
|
|
if matches!(p.peek().as_str(), "public" | "protected") {
|
|
p.consume()
|
|
}
|
|
}
|
|
if p.peek().as_str() != "function" {
|
|
p.error("Unexpected identifier");
|
|
p.consume();
|
|
while p.peek().kind == SyntaxKind::Identifier && p.peek().as_str() != "function" {
|
|
p.consume();
|
|
}
|
|
}
|
|
debug_assert_eq!(p.peek().as_str(), "function");
|
|
p.expect(SyntaxKind::Identifier); // "function"
|
|
{
|
|
let mut p = p.start_node(SyntaxKind::DeclaredIdentifier);
|
|
p.expect(SyntaxKind::Identifier);
|
|
}
|
|
if p.expect(SyntaxKind::LParent) {
|
|
while p.peek().kind() != SyntaxKind::RParent {
|
|
let mut p_arg = p.start_node(SyntaxKind::ArgumentDeclaration);
|
|
{
|
|
let mut p = p_arg.start_node(SyntaxKind::DeclaredIdentifier);
|
|
p.expect(SyntaxKind::Identifier);
|
|
}
|
|
p_arg.expect(SyntaxKind::Colon);
|
|
parse_type(&mut *p_arg);
|
|
drop(p_arg);
|
|
if !p.test(SyntaxKind::Comma) {
|
|
break;
|
|
}
|
|
}
|
|
p.expect(SyntaxKind::RParent);
|
|
if p.test(SyntaxKind::Arrow) {
|
|
let mut p = p.start_node(SyntaxKind::ReturnType);
|
|
parse_type(&mut *p);
|
|
}
|
|
}
|
|
parse_code_block(&mut *p);
|
|
}
|