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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
use std::collections::HashSet;
use deno_ast::swc::common::SyntaxContext;use deno_ast::view::Node;use deno_ast::view::NodeTrait;use deno_ast::ModuleSpecifier;use deno_ast::ParsedSource;use deno_ast::SourceRanged;use deno_core::error::AnyError;use deno_runtime::deno_node::NODE_GLOBAL_THIS_NAME;use std::fmt::Write;
use crate::cache::NodeAnalysisCache;
static NODE_GLOBALS: &[&str] = &[  "Buffer",  "clearImmediate",  "clearInterval",  "clearTimeout",  "console",  "global",  "process",  "setImmediate",  "setInterval",  "setTimeout",];
// TODO(dsherret): this code is way more inefficient than it needs to be.//// In the future, we should disable capturing tokens & scope analysis// and instead only use swc's APIs to go through the portions of the tree// that we know will affect the global scope while still ensuring that// `var` decls are taken into consideration.
pub fn esm_code_with_node_globals(  analysis_cache: &NodeAnalysisCache,  specifier: &ModuleSpecifier,  code: String,) -> Result<String, AnyError> {  let source_hash = NodeAnalysisCache::compute_source_hash(&code);  let text_info = deno_ast::SourceTextInfo::from_string(code);  let top_level_decls = if let Some(decls) =    analysis_cache.get_esm_analysis(specifier.as_str(), &source_hash)  {    HashSet::from_iter(decls)  } else {    let parsed_source = deno_ast::parse_program(deno_ast::ParseParams {      specifier: specifier.to_string(),      text_info: text_info.clone(),      media_type: deno_ast::MediaType::from(specifier),      capture_tokens: true,      scope_analysis: true,      maybe_syntax: None,    })?;    let top_level_decls = analyze_top_level_decls(&parsed_source)?;    analysis_cache.set_esm_analysis(      specifier.as_str(),      &source_hash,      &top_level_decls.clone().into_iter().collect(),    );    top_level_decls  };
  let mut globals = Vec::with_capacity(NODE_GLOBALS.len());  let has_global_this = top_level_decls.contains("globalThis");  for global in NODE_GLOBALS.iter() {    if !top_level_decls.contains(&global.to_string()) {      globals.push(*global);    }  }
  let mut result = String::new();  let global_this_expr = NODE_GLOBAL_THIS_NAME.as_str();  let global_this_expr = if has_global_this {    global_this_expr  } else {    write!(result, "var globalThis = {};", global_this_expr).unwrap();    "globalThis"  };  for global in globals {    write!(result, "var {0} = {1}.{0};", global, global_this_expr).unwrap();  }
  let file_text = text_info.text_str();  // strip the shebang  let file_text = if file_text.starts_with("#!/") {    let start_index = file_text.find('\n').unwrap_or(file_text.len());    &file_text[start_index..]  } else {    file_text  };  result.push_str(file_text);
  Ok(result)}
fn analyze_top_level_decls(  parsed_source: &ParsedSource,) -> Result<HashSet<String>, AnyError> {  let top_level_context = parsed_source.top_level_context();
  parsed_source.with_view(|program| {    let mut results = HashSet::new();    visit_children(program.into(), top_level_context, &mut results);    Ok(results)  })}
fn visit_children(  node: Node,  top_level_context: SyntaxContext,  results: &mut HashSet<String>,) {  if let Node::Ident(ident) = node {    if ident.ctxt() == top_level_context && is_local_declaration_ident(node) {      results.insert(ident.sym().to_string());    }  }
  for child in node.children() {    visit_children(child, top_level_context, results);  }}
fn is_local_declaration_ident(node: Node) -> bool {  if let Some(parent) = node.parent() {    match parent {      Node::BindingIdent(decl) => decl.id.range().contains(&node.range()),      Node::ClassDecl(decl) => decl.ident.range().contains(&node.range()),      Node::ClassExpr(decl) => decl        .ident        .as_ref()        .map(|i| i.range().contains(&node.range()))        .unwrap_or(false),      Node::TsInterfaceDecl(decl) => decl.id.range().contains(&node.range()),      Node::FnDecl(decl) => decl.ident.range().contains(&node.range()),      Node::FnExpr(decl) => decl        .ident        .as_ref()        .map(|i| i.range().contains(&node.range()))        .unwrap_or(false),      Node::TsModuleDecl(decl) => decl.id.range().contains(&node.range()),      Node::TsNamespaceDecl(decl) => decl.id.range().contains(&node.range()),      Node::VarDeclarator(decl) => decl.name.range().contains(&node.range()),      Node::ImportNamedSpecifier(decl) => {        decl.local.range().contains(&node.range())      }      Node::ImportDefaultSpecifier(decl) => {        decl.local.range().contains(&node.range())      }      Node::ImportStarAsSpecifier(decl) => decl.range().contains(&node.range()),      Node::KeyValuePatProp(decl) => decl.key.range().contains(&node.range()),      Node::AssignPatProp(decl) => decl.key.range().contains(&node.range()),      _ => false,    }  } else {    false  }}
#[cfg(test)]mod tests {  use super::*;
  #[test]  fn test_esm_code_with_node_globals() {    let r = esm_code_with_node_globals(      &NodeAnalysisCache::new(None),      &ModuleSpecifier::parse("https://example.com/foo/bar.js").unwrap(),      "export const x = 1;".to_string(),    )    .unwrap();    assert!(r.contains(&format!(      "var globalThis = {};",      NODE_GLOBAL_THIS_NAME.as_str()    )));    assert!(r.contains("var process = globalThis.process;"));    assert!(r.contains("export const x = 1;"));  }
  #[test]  fn test_esm_code_with_node_globals_with_shebang() {    let r = esm_code_with_node_globals(      &NodeAnalysisCache::new(None),      &ModuleSpecifier::parse("https://example.com/foo/bar.js").unwrap(),      "#!/usr/bin/env node\nexport const x = 1;".to_string(),    )    .unwrap();    assert_eq!(      r,      format!(        concat!(          "var globalThis = {}",          ";var Buffer = globalThis.Buffer;",          "var clearImmediate = globalThis.clearImmediate;var clearInterval = globalThis.clearInterval;",          "var clearTimeout = globalThis.clearTimeout;var console = globalThis.console;",          "var global = globalThis.global;var process = globalThis.process;",          "var setImmediate = globalThis.setImmediate;var setInterval = globalThis.setInterval;",          "var setTimeout = globalThis.setTimeout;\n",          "export const x = 1;"        ),        NODE_GLOBAL_THIS_NAME.as_str(),      )    );  }}