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//! JavaScript/TypeScript parser powered by OXC
//!
//! Parse source code and return AST as JSON.
use oxc::allocator::Allocator;
use oxc::ast::ast::Program;
use oxc::parser::Parser;
use oxc::span::SourceType;
use serde::{Deserialize, Serialize};
use std::fs;
/// Parse result containing AST information
#[derive(Debug, Serialize, Deserialize)]
pub struct ParseResult {
/// Whether parsing succeeded without errors
pub success: bool,
/// Parse errors if any
pub errors: Vec<ParseError>,
/// Program information (simplified AST summary)
#[serde(skip_serializing_if = "Option::is_none")]
pub program: Option<ProgramInfo>,
}
/// A parse error
#[derive(Debug, Serialize, Deserialize)]
pub struct ParseError {
pub message: String,
pub line: u32,
pub column: u32,
}
/// Simplified program information
#[derive(Debug, Serialize, Deserialize)]
pub struct ProgramInfo {
/// Source type (script or module)
pub source_type: String,
/// Whether the file uses strict mode
pub has_use_strict: bool,
/// Number of statements
pub statement_count: usize,
/// Imports found
pub imports: Vec<ImportInfo>,
/// Exports found
pub exports: Vec<ExportInfo>,
/// Functions declared
pub functions: Vec<FunctionInfo>,
/// Classes declared
pub classes: Vec<ClassInfo>,
/// Variables declared at top level
pub variables: Vec<VariableInfo>,
}
/// Import information
#[derive(Debug, Serialize, Deserialize)]
pub struct ImportInfo {
pub source: String,
pub specifiers: Vec<String>,
pub is_type_only: bool,
}
/// Export information
#[derive(Debug, Serialize, Deserialize)]
pub struct ExportInfo {
pub name: String,
pub is_default: bool,
pub is_type_only: bool,
}
/// Function information
#[derive(Debug, Serialize, Deserialize)]
pub struct FunctionInfo {
pub name: Option<String>,
pub is_async: bool,
pub is_generator: bool,
pub param_count: usize,
}
/// Class information
#[derive(Debug, Serialize, Deserialize)]
pub struct ClassInfo {
pub name: Option<String>,
pub has_super: bool,
pub method_count: usize,
}
/// Variable information
#[derive(Debug, Serialize, Deserialize)]
pub struct VariableInfo {
pub name: String,
pub kind: String,
}
/// AST Parser
pub struct AstParser;
impl AstParser {
/// Parse a file and return structured information
pub fn parse_file(path: &str) -> Result<ParseResult, String> {
let source = fs::read_to_string(path).map_err(|e| format!("Failed to read file: {}", e))?;
Self::parse_source(path, &source)
}
/// Parse source code and return structured information
pub fn parse_source(filename: &str, source: &str) -> Result<ParseResult, String> {
let allocator = Allocator::default();
let source_type = SourceType::from_path(filename).unwrap_or_default();
let parser = Parser::new(&allocator, source, source_type);
let ret = parser.parse();
if !ret.errors.is_empty() {
return Ok(ParseResult {
success: false,
errors: ret
.errors
.iter()
.map(|e| {
// Extract offset from error labels if available
let offset = e
.labels
.as_ref()
.and_then(|labels| labels.first())
.map(|label| label.offset())
.unwrap_or(0);
let (line, column) = Self::offset_to_line_col(source, offset);
ParseError {
message: e.to_string(),
line,
column,
}
})
.collect(),
program: None,
});
}
let program_info = Self::extract_program_info(&ret.program);
Ok(ParseResult {
success: true,
errors: vec![],
program: Some(program_info),
})
}
/// Convert byte offset to line and column numbers (1-indexed)
fn offset_to_line_col(source: &str, offset: usize) -> (u32, u32) {
let mut line = 1u32;
let mut col = 1u32;
for (i, ch) in source.char_indices() {
if i >= offset {
break;
}
if ch == '\n' {
line += 1;
col = 1;
} else {
col += 1;
}
}
(line, col)
}
fn extract_program_info(program: &Program) -> ProgramInfo {
use oxc::ast::ast::*;
let mut imports = Vec::new();
let mut exports = Vec::new();
let mut functions = Vec::new();
let mut classes = Vec::new();
let mut variables = Vec::new();
let mut has_use_strict = false;
for stmt in &program.body {
match stmt {
Statement::ExpressionStatement(expr_stmt) => {
if let Expression::StringLiteral(lit) = &expr_stmt.expression {
if lit.value == "use strict" {
has_use_strict = true;
}
}
}
Statement::ImportDeclaration(import) => {
let specifiers: Vec<String> = import
.specifiers
.as_ref()
.map(|specs| {
specs
.iter()
.map(|s| match s {
ImportDeclarationSpecifier::ImportSpecifier(spec) => {
spec.local.name.to_string()
}
ImportDeclarationSpecifier::ImportDefaultSpecifier(spec) => {
spec.local.name.to_string()
}
ImportDeclarationSpecifier::ImportNamespaceSpecifier(spec) => {
format!("* as {}", spec.local.name)
}
})
.collect()
})
.unwrap_or_default();
imports.push(ImportInfo {
source: import.source.value.to_string(),
specifiers,
is_type_only: import.import_kind.is_type(),
});
}
Statement::ExportDefaultDeclaration(export) => {
let name = match &export.declaration {
ExportDefaultDeclarationKind::FunctionDeclaration(f) => {
f.id.as_ref()
.map(|id| id.name.to_string())
.unwrap_or_else(|| "default".to_string())
}
ExportDefaultDeclarationKind::ClassDeclaration(c) => {
c.id.as_ref()
.map(|id| id.name.to_string())
.unwrap_or_else(|| "default".to_string())
}
_ => "default".to_string(),
};
exports.push(ExportInfo {
name,
is_default: true,
is_type_only: false,
});
}
Statement::ExportNamedDeclaration(export) => {
if let Some(decl) = &export.declaration {
match decl {
Declaration::VariableDeclaration(var) => {
for declarator in &var.declarations {
if let BindingPattern::BindingIdentifier(id) = &declarator.id {
exports.push(ExportInfo {
name: id.name.to_string(),
is_default: false,
is_type_only: export.export_kind.is_type(),
});
}
}
}
Declaration::FunctionDeclaration(func) => {
if let Some(id) = &func.id {
exports.push(ExportInfo {
name: id.name.to_string(),
is_default: false,
is_type_only: false,
});
}
}
Declaration::ClassDeclaration(class) => {
if let Some(id) = &class.id {
exports.push(ExportInfo {
name: id.name.to_string(),
is_default: false,
is_type_only: false,
});
}
}
Declaration::TSTypeAliasDeclaration(alias) => {
exports.push(ExportInfo {
name: alias.id.name.to_string(),
is_default: false,
is_type_only: true,
});
}
Declaration::TSInterfaceDeclaration(iface) => {
exports.push(ExportInfo {
name: iface.id.name.to_string(),
is_default: false,
is_type_only: true,
});
}
_ => {}
}
}
}
Statement::FunctionDeclaration(func) => {
functions.push(FunctionInfo {
name: func.id.as_ref().map(|id| id.name.to_string()),
is_async: func.r#async,
is_generator: func.generator,
param_count: func.params.items.len(),
});
}
Statement::ClassDeclaration(class) => {
let method_count = class
.body
.body
.iter()
.filter(|e| matches!(e, ClassElement::MethodDefinition(_)))
.count();
classes.push(ClassInfo {
name: class.id.as_ref().map(|id| id.name.to_string()),
has_super: class.super_class.is_some(),
method_count,
});
}
Statement::VariableDeclaration(var) => {
let kind = match var.kind {
VariableDeclarationKind::Var => "var",
VariableDeclarationKind::Let => "let",
VariableDeclarationKind::Const => "const",
VariableDeclarationKind::Using => "using",
VariableDeclarationKind::AwaitUsing => "await using",
};
for declarator in &var.declarations {
if let BindingPattern::BindingIdentifier(id) = &declarator.id {
variables.push(VariableInfo {
name: id.name.to_string(),
kind: kind.to_string(),
});
}
}
}
_ => {}
}
}
ProgramInfo {
source_type: if program.source_type.is_module() {
"module"
} else {
"script"
}
.to_string(),
has_use_strict,
statement_count: program.body.len(),
imports,
exports,
functions,
classes,
variables,
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_parse_simple() {
let result = AstParser::parse_source("test.js", "const x = 1;").unwrap();
assert!(result.success);
assert!(result.program.is_some());
assert_eq!(result.program.as_ref().unwrap().variables.len(), 1);
}
#[test]
fn test_parse_imports() {
let result =
AstParser::parse_source("test.ts", "import { foo } from 'bar'; export const x = 1;")
.unwrap();
assert!(result.success);
let program = result.program.unwrap();
assert_eq!(program.imports.len(), 1);
assert_eq!(program.imports[0].source, "bar");
assert_eq!(program.exports.len(), 1);
}
#[test]
fn test_parse_error() {
let result = AstParser::parse_source("test.js", "const x = ").unwrap();
assert!(!result.success);
assert!(!result.errors.is_empty());
}
}