feat(tvix/eval): add an AST pretty-printing module
This implements serde::Serialize for the rnix AST through a wrapper type, and exposes a function for serialising the AST into a (pretty-printed JSON) string representation. This can be used to debug issues with the AST, and to display an AST reprsentation in tools like tvixbolt. Serialize is implemented manually because we don't own any of the structs and the way to traverse them is not easily derived automatically, and this is quite verbose. We might be able to condense it a little bit, but at the same time it's also fairly straightforward. Change-Id: I922df43cfc25636f3c8baee7944c75ade516055c Reviewed-on: https://cl.tvl.fyi/c/depot/+/6943 Autosubmit: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI Reviewed-by: Adam Joseph <adam@westernsemico.com> Reviewed-by: tazjin <tazjin@tvl.su>
This commit is contained in:
parent
d9c497520c
commit
0abc66ad91
6 changed files with 503 additions and 2 deletions
1
corp/tvixbolt/Cargo.lock
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1
corp/tvixbolt/Cargo.lock
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@ -615,6 +615,7 @@ dependencies = [
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"regex",
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"rnix",
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"rowan",
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"serde",
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"serde_json",
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"smol_str",
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"tabwriter",
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1
tvix/eval/Cargo.lock
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1
tvix/eval/Cargo.lock
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@ -1223,6 +1223,7 @@ dependencies = [
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"rnix",
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"rowan",
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"rustyline",
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"serde",
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"serde_json",
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"smol_str",
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"tabwriter",
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@ -24,7 +24,8 @@ codemap-diagnostic = "0.1.1"
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proptest = { version = "1.0.0", default_features = false, features = ["std", "alloc", "break-dead-code", "tempfile"], optional = true }
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test-strategy = { version = "0.2.1", optional = true }
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clap = { version = "3.2.22", optional = true, features = ["derive", "env"] }
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serde_json = "1.0.86"
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serde = "1.0"
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serde_json = "1.0"
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regex = "1.6.0"
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# rnix has not been released in a while (as of 2022-09-23), we will
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@ -5,6 +5,7 @@ use crate::{
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errors::{Error, ErrorKind, EvalResult},
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nix_search_path::NixSearchPath,
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observer::{DisassemblingObserver, NoOpObserver, TracingObserver},
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pretty_ast::pretty_print_expr,
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value::Value,
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SourceCode,
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};
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@ -76,7 +77,7 @@ pub fn interpret(code: &str, location: Option<PathBuf>, options: Options) -> Eva
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.expect("expression should exist if no errors occured");
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if options.display_ast {
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println!("{:?}", root_expr);
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println!("{}", pretty_print_expr(&root_expr));
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}
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// TODO: encapsulate this import weirdness in builtins
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@ -5,6 +5,7 @@ mod errors;
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mod eval;
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pub mod observer;
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mod opcode;
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mod pretty_ast;
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mod source;
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mod spans;
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mod upvalues;
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@ -25,6 +26,7 @@ pub use crate::builtins::global_builtins;
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pub use crate::compiler::compile;
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pub use crate::errors::EvalResult;
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pub use crate::eval::{interpret, Options};
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pub use crate::pretty_ast::pretty_print_expr;
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pub use crate::source::SourceCode;
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pub use crate::value::Value;
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pub use crate::vm::run_lambda;
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495
tvix/eval/src/pretty_ast.rs
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495
tvix/eval/src/pretty_ast.rs
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@ -0,0 +1,495 @@
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//! Pretty-printed format for the rnix AST representation.
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//!
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//! The AST is serialised into a JSON structure that can then be
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//! printed in either minimised or well-formatted style.
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use rnix::ast::{self, AstToken, HasEntry};
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use serde::{ser::SerializeMap, Serialize, Serializer};
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pub fn pretty_print_expr(expr: &ast::Expr) -> String {
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serde_json::ser::to_string_pretty(&SerializeAST(expr))
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.expect("serializing AST should always succeed")
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}
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#[repr(transparent)]
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struct SerializeAST<S>(S);
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impl<'a> Serialize for SerializeAST<&'a ast::Apply> {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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let mut map = serializer.serialize_map(Some(3))?;
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map.serialize_entry("kind", "apply")?;
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map.serialize_entry("fn", &SerializeAST(&self.0.lambda().unwrap()))?;
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map.serialize_entry("arg", &SerializeAST(&self.0.argument().unwrap()))?;
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map.end()
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}
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}
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impl<'a> Serialize for SerializeAST<&'a ast::Assert> {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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let mut map = serializer.serialize_map(Some(3))?;
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map.serialize_entry("kind", "assert")?;
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map.serialize_entry("condition", &SerializeAST(&self.0.condition().unwrap()))?;
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map.serialize_entry("body", &SerializeAST(&self.0.body().unwrap()))?;
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map.end()
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}
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}
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impl<'a> Serialize for SerializeAST<&'a ast::Error> {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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let mut map = serializer.serialize_map(Some(2))?;
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map.serialize_entry("kind", "error")?;
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map.serialize_entry("node", &self.0.to_string())?;
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map.end()
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}
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}
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impl<'a> Serialize for SerializeAST<&'a ast::IfElse> {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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let mut map = serializer.serialize_map(Some(4))?;
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map.serialize_entry("kind", "if_else")?;
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map.serialize_entry("condition", &SerializeAST(&self.0.condition().unwrap()))?;
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map.serialize_entry("then_body", &SerializeAST(&self.0.body().unwrap()))?;
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map.serialize_entry("else_body", &SerializeAST(&self.0.else_body().unwrap()))?;
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map.end()
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}
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}
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impl<'a> Serialize for SerializeAST<&'a ast::Select> {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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let size = match self.0.default_expr() {
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Some(_) => 4,
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None => 3,
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};
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let mut map = serializer.serialize_map(Some(size))?;
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map.serialize_entry("kind", "select")?;
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map.serialize_entry("set", &SerializeAST(&self.0.expr().unwrap()))?;
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map.serialize_entry("path", &SerializeAST(self.0.attrpath().unwrap()))?;
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if let Some(default) = self.0.default_expr() {
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map.serialize_entry("default", &SerializeAST(&default))?;
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}
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map.end()
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}
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}
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impl<'a> Serialize for SerializeAST<ast::InterpolPart<String>> {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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match &self.0 {
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ast::InterpolPart::Literal(s) => Serialize::serialize(s, serializer),
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ast::InterpolPart::Interpolation(node) => {
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Serialize::serialize(&SerializeAST(&node.expr().unwrap()), serializer)
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}
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}
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}
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}
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impl<'a> Serialize for SerializeAST<&'a ast::Str> {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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let mut map = serializer.serialize_map(Some(2))?;
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map.serialize_entry("kind", "string")?;
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map.serialize_entry(
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"parts",
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&self
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.0
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.normalized_parts()
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.into_iter()
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.map(|part| SerializeAST(part))
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.collect::<Vec<_>>(),
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)?;
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map.end()
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}
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}
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impl<'a> Serialize for SerializeAST<ast::InterpolPart<ast::PathContent>> {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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match &self.0 {
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ast::InterpolPart::Literal(p) => Serialize::serialize(p.syntax().text(), serializer),
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ast::InterpolPart::Interpolation(node) => {
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Serialize::serialize(&SerializeAST(&node.expr().unwrap()), serializer)
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}
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}
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}
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}
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impl<'a> Serialize for SerializeAST<&'a ast::Path> {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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let mut map = serializer.serialize_map(Some(2))?;
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map.serialize_entry("kind", "path")?;
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map.serialize_entry(
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"parts",
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&self
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.0
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.parts()
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.map(|part| SerializeAST(part))
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.collect::<Vec<_>>(),
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)?;
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map.end()
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}
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}
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impl<'a> Serialize for SerializeAST<&'a ast::Literal> {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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match self.0.kind() {
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ast::LiteralKind::Float(val) => serializer.serialize_f64(val.value().unwrap()),
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ast::LiteralKind::Integer(val) => serializer.serialize_i64(val.value().unwrap()),
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ast::LiteralKind::Uri(val) => {
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let url = val.syntax().text();
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let mut map = serializer.serialize_map(Some(2))?;
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map.serialize_entry("kind", "url")?;
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map.serialize_entry("url", url)?;
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map.end()
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}
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}
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}
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}
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impl<'a> Serialize for SerializeAST<ast::PatEntry> {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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let mut map = serializer.serialize_map(None)?;
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map.serialize_entry("ident", &SerializeAST(&self.0.ident().unwrap()))?;
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if let Some(default) = self.0.default() {
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map.serialize_entry("default", &SerializeAST(&default))?;
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}
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map.end()
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}
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}
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impl<'a> Serialize for SerializeAST<ast::Param> {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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match &self.0 {
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ast::Param::Pattern(pat) => {
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let mut map = serializer.serialize_map(None)?;
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map.serialize_entry("kind", "formals")?;
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map.serialize_entry(
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"entries",
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&pat.pat_entries()
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.map(|entry| SerializeAST(entry))
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.collect::<Vec<_>>(),
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)?;
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if let Some(bind) = pat.pat_bind() {
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map.serialize_entry("bind", &SerializeAST(&bind.ident().unwrap()))?;
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}
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map.serialize_entry("ellipsis", &pat.ellipsis_token().is_some())?;
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map.end()
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}
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ast::Param::IdentParam(node) => {
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Serialize::serialize(&SerializeAST(&node.ident().unwrap()), serializer)
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}
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}
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}
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}
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impl<'a> Serialize for SerializeAST<&'a ast::Lambda> {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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let mut map = serializer.serialize_map(Some(3))?;
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map.serialize_entry("kind", "lambda")?;
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map.serialize_entry("param", &SerializeAST(self.0.param().unwrap()))?;
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map.serialize_entry("body", &SerializeAST(self.0.body().unwrap()))?;
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map.end()
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}
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}
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impl<'a> Serialize for SerializeAST<&'a ast::LegacyLet> {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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let mut map = serializer.serialize_map(Some(3))?;
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map.serialize_entry("kind", "legacy_let")?;
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map.serialize_entry(
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"entries",
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&self
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.0
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.attrpath_values()
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.map(|val| SerializeAST(val))
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.collect::<Vec<_>>(),
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)?;
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map.serialize_entry(
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"inherits",
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&self
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.0
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.inherits()
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.map(|val| SerializeAST(val))
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.collect::<Vec<_>>(),
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)?;
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map.end()
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}
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}
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impl<'a> Serialize for SerializeAST<&'a ast::LetIn> {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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let mut map = serializer.serialize_map(Some(3))?;
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map.serialize_entry("kind", "let")?;
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map.serialize_entry(
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"entries",
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&self
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.0
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.attrpath_values()
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.map(|val| SerializeAST(val))
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.collect::<Vec<_>>(),
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)?;
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map.serialize_entry(
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"inherits",
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&self
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.0
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.inherits()
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.map(|val| SerializeAST(val))
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.collect::<Vec<_>>(),
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)?;
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map.serialize_entry("body", &SerializeAST(&self.0.body().unwrap()))?;
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map.end()
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}
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}
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impl<'a> Serialize for SerializeAST<&'a ast::List> {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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let list = self
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.0
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.items()
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.map(|elem| SerializeAST(elem))
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.collect::<Vec<_>>();
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let mut map = serializer.serialize_map(Some(2))?;
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map.serialize_entry("kind", "list")?;
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map.serialize_entry("items", &list)?;
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map.end()
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}
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}
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impl<'a> Serialize for SerializeAST<&'a ast::BinOp> {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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let mut map = serializer.serialize_map(Some(4))?;
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map.serialize_entry("kind", "binary_op")?;
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map.serialize_entry(
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"operator",
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match self.0.operator().unwrap() {
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ast::BinOpKind::Concat => "concat",
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ast::BinOpKind::Update => "update",
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ast::BinOpKind::Add => "add",
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ast::BinOpKind::Sub => "sub",
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ast::BinOpKind::Mul => "mul",
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ast::BinOpKind::Div => "div",
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ast::BinOpKind::And => "and",
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ast::BinOpKind::Equal => "equal",
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ast::BinOpKind::Implication => "implication",
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ast::BinOpKind::Less => "less",
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ast::BinOpKind::LessOrEq => "less_or_eq",
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ast::BinOpKind::More => "more",
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ast::BinOpKind::MoreOrEq => "more_or_eq",
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ast::BinOpKind::NotEqual => "not_equal",
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ast::BinOpKind::Or => "or",
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},
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)?;
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map.serialize_entry("lhs", &SerializeAST(&self.0.lhs().unwrap()))?;
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map.serialize_entry("rhs", &SerializeAST(&self.0.rhs().unwrap()))?;
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map.end()
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}
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}
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impl<'a> Serialize for SerializeAST<&'a ast::Paren> {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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let mut map = serializer.serialize_map(Some(2))?;
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map.serialize_entry("kind", "paren")?;
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map.serialize_entry("expr", &SerializeAST(&self.0.expr().unwrap()))?;
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map.end()
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}
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}
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impl<'a> Serialize for SerializeAST<&'a ast::Root> {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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let mut map = serializer.serialize_map(Some(2))?;
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map.serialize_entry("kind", "root")?;
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map.serialize_entry("expr", &SerializeAST(&self.0.expr().unwrap()))?;
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map.end()
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}
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}
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impl<'a> Serialize for SerializeAST<ast::AttrpathValue> {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
|
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let mut map = serializer.serialize_map(Some(2))?;
|
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map.serialize_entry("name", &SerializeAST(self.0.attrpath().unwrap()))?;
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map.serialize_entry("value", &SerializeAST(self.0.value().unwrap()))?;
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map.end()
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}
|
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}
|
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impl<'a> Serialize for SerializeAST<ast::Inherit> {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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let mut map = serializer.serialize_map(None)?;
|
||||
|
||||
if let Some(from) = self.0.from() {
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map.serialize_entry("namespace", &SerializeAST(&from.expr().unwrap()))?;
|
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}
|
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|
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map.serialize_entry(
|
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"names",
|
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&self.0.attrs().map(|a| SerializeAST(a)).collect::<Vec<_>>(),
|
||||
)?;
|
||||
|
||||
map.end()
|
||||
}
|
||||
}
|
||||
|
||||
impl<'a> Serialize for SerializeAST<&'a ast::AttrSet> {
|
||||
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
|
||||
let mut map = serializer.serialize_map(None)?;
|
||||
map.serialize_entry("kind", "attrset")?;
|
||||
map.serialize_entry("recursive", &self.0.rec_token().is_some())?;
|
||||
|
||||
map.serialize_entry(
|
||||
"entries",
|
||||
&self
|
||||
.0
|
||||
.attrpath_values()
|
||||
.map(|val| SerializeAST(val))
|
||||
.collect::<Vec<_>>(),
|
||||
)?;
|
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|
||||
map.serialize_entry(
|
||||
"inherits",
|
||||
&self
|
||||
.0
|
||||
.inherits()
|
||||
.map(|val| SerializeAST(val))
|
||||
.collect::<Vec<_>>(),
|
||||
)?;
|
||||
|
||||
map.end()
|
||||
}
|
||||
}
|
||||
|
||||
impl<'a> Serialize for SerializeAST<&'a ast::UnaryOp> {
|
||||
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
|
||||
let mut map = serializer.serialize_map(Some(3))?;
|
||||
map.serialize_entry("kind", "unary_op")?;
|
||||
|
||||
map.serialize_entry(
|
||||
"operator",
|
||||
match self.0.operator().unwrap() {
|
||||
ast::UnaryOpKind::Invert => "invert",
|
||||
ast::UnaryOpKind::Negate => "negate",
|
||||
},
|
||||
)?;
|
||||
|
||||
map.serialize_entry("expr", &SerializeAST(&self.0.expr().unwrap()))?;
|
||||
map.end()
|
||||
}
|
||||
}
|
||||
|
||||
impl<'a> Serialize for SerializeAST<&'a ast::Ident> {
|
||||
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
|
||||
let mut map = serializer.serialize_map(Some(2))?;
|
||||
map.serialize_entry("kind", "ident")?;
|
||||
map.serialize_entry("ident", self.0.ident_token().unwrap().text())?;
|
||||
map.end()
|
||||
}
|
||||
}
|
||||
|
||||
impl<'a> Serialize for SerializeAST<&'a ast::With> {
|
||||
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
|
||||
let mut map = serializer.serialize_map(Some(3))?;
|
||||
map.serialize_entry("kind", "with")?;
|
||||
map.serialize_entry("with", &SerializeAST(&self.0.namespace().unwrap()))?;
|
||||
map.serialize_entry("body", &SerializeAST(&self.0.body().unwrap()))?;
|
||||
map.end()
|
||||
}
|
||||
}
|
||||
|
||||
impl<'a> Serialize for SerializeAST<&'a ast::Dynamic> {
|
||||
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
|
||||
let mut map = serializer.serialize_map(Some(2))?;
|
||||
map.serialize_entry("kind", "dynamic")?;
|
||||
map.serialize_entry("expr", &SerializeAST(&self.0.expr().unwrap()))?;
|
||||
map.end()
|
||||
}
|
||||
}
|
||||
|
||||
impl Serialize for SerializeAST<ast::Attr> {
|
||||
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
|
||||
match &self.0 {
|
||||
ast::Attr::Ident(ident) => Serialize::serialize(&SerializeAST(ident), serializer),
|
||||
ast::Attr::Dynamic(node) => Serialize::serialize(&SerializeAST(node), serializer),
|
||||
ast::Attr::Str(node) => Serialize::serialize(&SerializeAST(node), serializer),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl Serialize for SerializeAST<ast::Attrpath> {
|
||||
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
|
||||
let mut map = serializer.serialize_map(Some(2))?;
|
||||
map.serialize_entry("kind", "attrpath")?;
|
||||
|
||||
map.serialize_entry(
|
||||
"path",
|
||||
&self
|
||||
.0
|
||||
.attrs()
|
||||
.map(|attr| SerializeAST(attr))
|
||||
.collect::<Vec<_>>(),
|
||||
)?;
|
||||
|
||||
map.end()
|
||||
}
|
||||
}
|
||||
|
||||
impl<'a> Serialize for SerializeAST<&'a ast::HasAttr> {
|
||||
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
|
||||
let mut map = serializer.serialize_map(Some(3))?;
|
||||
map.serialize_entry("kind", "has_attr")?;
|
||||
map.serialize_entry("expr", &SerializeAST(&self.0.expr().unwrap()))?;
|
||||
map.serialize_entry("attrpath", &SerializeAST(self.0.attrpath().unwrap()))?;
|
||||
map.end()
|
||||
}
|
||||
}
|
||||
|
||||
impl<'a> Serialize for SerializeAST<&'a ast::Expr> {
|
||||
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
|
||||
match self.0 {
|
||||
ast::Expr::Apply(node) => Serialize::serialize(&SerializeAST(node), serializer),
|
||||
ast::Expr::Assert(node) => Serialize::serialize(&SerializeAST(node), serializer),
|
||||
ast::Expr::Error(node) => Serialize::serialize(&SerializeAST(node), serializer),
|
||||
ast::Expr::IfElse(node) => Serialize::serialize(&SerializeAST(node), serializer),
|
||||
ast::Expr::Select(node) => Serialize::serialize(&SerializeAST(node), serializer),
|
||||
ast::Expr::Str(node) => Serialize::serialize(&SerializeAST(node), serializer),
|
||||
ast::Expr::Path(node) => Serialize::serialize(&SerializeAST(node), serializer),
|
||||
ast::Expr::Literal(node) => Serialize::serialize(&SerializeAST(node), serializer),
|
||||
ast::Expr::Lambda(node) => Serialize::serialize(&SerializeAST(node), serializer),
|
||||
ast::Expr::LegacyLet(node) => Serialize::serialize(&SerializeAST(node), serializer),
|
||||
ast::Expr::LetIn(node) => Serialize::serialize(&SerializeAST(node), serializer),
|
||||
ast::Expr::List(node) => Serialize::serialize(&SerializeAST(node), serializer),
|
||||
ast::Expr::BinOp(node) => Serialize::serialize(&SerializeAST(node), serializer),
|
||||
ast::Expr::Paren(node) => Serialize::serialize(&SerializeAST(node), serializer),
|
||||
ast::Expr::Root(node) => Serialize::serialize(&SerializeAST(node), serializer),
|
||||
ast::Expr::AttrSet(node) => Serialize::serialize(&SerializeAST(node), serializer),
|
||||
ast::Expr::UnaryOp(node) => Serialize::serialize(&SerializeAST(node), serializer),
|
||||
ast::Expr::Ident(node) => Serialize::serialize(&SerializeAST(node), serializer),
|
||||
ast::Expr::With(node) => Serialize::serialize(&SerializeAST(node), serializer),
|
||||
ast::Expr::HasAttr(node) => Serialize::serialize(&SerializeAST(node), serializer),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl Serialize for SerializeAST<ast::Expr> {
|
||||
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
|
||||
SerializeAST(&self.0).serialize(serializer)
|
||||
}
|
||||
}
|
Loading…
Reference in a new issue