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use comemo::Track;
use ecow::{eco_format, EcoString};
use serde::Serialize;
use typst::diag::{bail, StrResult};
use typst::eval::{eval_string, EvalMode, Tracer};
use typst::foundations::{Content, IntoValue, LocatableSelector, Scope};
use typst::model::Document;
use typst::syntax::Span;
use typst::World;
use crate::args::{QueryCommand, SerializationFormat};
use crate::compile::print_diagnostics;
use crate::set_failed;
use crate::world::SystemWorld;
/// Execute a query command.
pub fn query(command: &QueryCommand) -> StrResult<()> {
let mut world = SystemWorld::new(&command.common)?;
// Reset everything and ensure that the main file is present.
world.reset();
world.source(world.main()).map_err(|err| err.to_string())?;
let mut tracer = Tracer::new();
let result = typst::compile(&world, &mut tracer);
let warnings = tracer.warnings();
match result {
// Retrieve and print query results.
Ok(document) => {
let data = retrieve(&world, command, &document)?;
let serialized = format(data, command)?;
println!("{serialized}");
print_diagnostics(&world, &[], &warnings, command.common.diagnostic_format)
.map_err(|err| eco_format!("failed to print diagnostics ({err})"))?;
}
// Print diagnostics.
Err(errors) => {
set_failed();
print_diagnostics(
&world,
&errors,
&warnings,
command.common.diagnostic_format,
)
.map_err(|err| eco_format!("failed to print diagnostics ({err})"))?;
}
}
Ok(())
}
/// Retrieve the matches for the selector.
fn retrieve(
world: &dyn World,
command: &QueryCommand,
document: &Document,
) -> StrResult<Vec<Content>> {
let selector = eval_string(
world.track(),
&command.selector,
Span::detached(),
EvalMode::Code,
Scope::default(),
)
.map_err(|errors| {
let mut message = EcoString::from("failed to evaluate selector");
for (i, error) in errors.into_iter().enumerate() {
message.push_str(if i == 0 { ": " } else { ", " });
message.push_str(&error.message);
}
message
})?
.cast::<LocatableSelector>()?;
Ok(document
.introspector
.query(&selector.0)
.into_iter()
.map(|x| x.into_inner())
.collect::<Vec<_>>())
}
/// Format the query result in the output format.
fn format(elements: Vec<Content>, command: &QueryCommand) -> StrResult<String> {
if command.one && elements.len() != 1 {
bail!("expected exactly one element, found {}", elements.len());
}
let mapped: Vec<_> = elements
.into_iter()
.filter_map(|c| match &command.field {
Some(field) => c.get_by_name(field),
_ => Some(c.into_value()),
})
.collect();
if command.one {
let Some(value) = mapped.first() else {
bail!("no such field found for element");
};
serialize(value, command.format)
} else {
serialize(&mapped, command.format)
}
}
/// Serialize data to the output format.
fn serialize(data: &impl Serialize, format: SerializationFormat) -> StrResult<String> {
match format {
SerializationFormat::Json => {
serde_json::to_string_pretty(data).map_err(|e| eco_format!("{e}"))
}
SerializationFormat::Yaml => {
serde_yaml::to_string(&data).map_err(|e| eco_format!("{e}"))
}
}
}
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