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|
use if_chain::if_chain;
use unicode_segmentation::UnicodeSegmentation;
use super::{analyze, plain_docs_sentence, summarize_font_family};
use crate::model::{CastInfo, Tracer, Value};
use crate::syntax::ast;
use crate::syntax::{LinkedNode, Source, SyntaxKind};
use crate::World;
/// Describe the item under the cursor.
pub fn tooltip(
world: &(dyn World + 'static),
source: &Source,
cursor: usize,
) -> Option<String> {
let leaf = LinkedNode::new(source.root()).leaf_at(cursor)?;
named_param_tooltip(world, &leaf)
.or_else(|| font_family_tooltip(world, &leaf))
.or_else(|| expr_tooltip(world, &leaf))
}
/// Tooltip for a hovered expression.
fn expr_tooltip(world: &(dyn World + 'static), leaf: &LinkedNode) -> Option<String> {
if !leaf.is::<ast::Expr>() {
return None;
}
let values = analyze(world, leaf);
if let [value] = values.as_slice() {
if let Some(docs) = value.docs() {
return Some(plain_docs_sentence(docs));
}
}
let mut tooltip = String::new();
let mut iter = values.into_iter().enumerate();
for (i, value) in (&mut iter).take(Tracer::MAX - 1) {
if i > 0 && !tooltip.is_empty() {
tooltip.push_str(", ");
}
let repr = value.repr();
let repr = repr.as_str();
let len = repr.len();
if len <= 40 {
tooltip.push_str(repr);
} else {
let mut graphemes = repr.graphemes(true);
let r = graphemes.next_back().map_or(0, str::len);
let l = graphemes.take(40).map(str::len).sum();
tooltip.push_str(&repr[..l]);
tooltip.push_str("...");
tooltip.push_str(&repr[len - r..]);
}
}
if iter.next().is_some() {
tooltip.push_str(", ...");
}
(!tooltip.is_empty()).then(|| tooltip)
}
/// Tooltips for components of a named parameter.
fn named_param_tooltip(
world: &(dyn World + 'static),
leaf: &LinkedNode,
) -> Option<String> {
let (info, named) = if_chain! {
// Ensure that we are in a named pair in the arguments to a function
// call or set rule.
if let Some(parent) = leaf.parent();
if let Some(named) = parent.cast::<ast::Named>();
if let Some(grand) = parent.parent();
if matches!(grand.kind(), SyntaxKind::Args);
if let Some(grand_grand) = grand.parent();
if let Some(expr) = grand_grand.cast::<ast::Expr>();
if let Some(ast::Expr::Ident(callee)) = match expr {
ast::Expr::FuncCall(call) => Some(call.callee()),
ast::Expr::Set(set) => Some(set.target()),
_ => None,
};
// Find metadata about the function.
if let Some(Value::Func(func)) = world.library().global.scope().get(&callee);
if let Some(info) = func.info();
then { (info, named) }
else { return None; }
};
// Hovering over the parameter name.
if_chain! {
if leaf.index() == 0;
if let Some(ident) = leaf.cast::<ast::Ident>();
if let Some(param) = info.param(&ident);
then {
return Some(plain_docs_sentence(param.docs));
}
}
// Hovering over a string parameter value.
if_chain! {
if let Some(string) = leaf.cast::<ast::Str>();
if let Some(param) = info.param(&named.name());
if let Some(docs) = find_string_doc(¶m.cast, &string.get());
then {
return Some(docs.into());
}
}
None
}
/// Find documentation for a castable string.
fn find_string_doc(info: &CastInfo, string: &str) -> Option<&'static str> {
match info {
CastInfo::Value(Value::Str(s), docs) if s.as_str() == string => Some(docs),
CastInfo::Union(options) => {
options.iter().find_map(|option| find_string_doc(option, string))
}
_ => None,
}
}
/// Tooltip for font family.
fn font_family_tooltip(
world: &(dyn World + 'static),
leaf: &LinkedNode,
) -> Option<String> {
if_chain! {
// Ensure that we are on top of a string.
if let Some(string) = leaf.cast::<ast::Str>();
let lower = string.get().to_lowercase();
// Ensure that we are in the arguments to the text function.
if let Some(parent) = leaf.parent();
if matches!(parent.kind(), SyntaxKind::Args);
if let Some(grand) = parent.parent();
if let Some(expr) = grand.cast::<ast::Expr>();
if let Some(ast::Expr::Ident(callee)) = match expr {
ast::Expr::FuncCall(call) => Some(call.callee()),
ast::Expr::Set(set) => Some(set.target()),
_ => None,
};
// Find the font family.
if callee.as_str() == "text";
if let Some((_, iter)) = world
.book()
.families()
.find(|&(family, _)| family.to_lowercase().as_str() == lower.as_str());
then {
let detail = summarize_font_family(iter);
return Some(detail);
}
};
None
}
|
