mirror of
https://github.com/denoland/deno.git
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336 lines
9.2 KiB
Rust
336 lines
9.2 KiB
Rust
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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//! This mod provides DenoError to unify errors across Deno.
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use crate::colors::cyan;
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use crate::colors::italic_bold;
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use crate::colors::red;
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use crate::colors::yellow;
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use deno_core::error::format_file_name;
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use deno_core::error::JsError;
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use deno_core::error::JsStackFrame;
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use std::fmt::Write as _;
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/// Compares all properties of JsError, except for JsError::cause.
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/// This function is used to detect that 2 JsError objects in a JsError::cause
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/// chain are identical, ie. there is a recursive cause.
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/// 01_console.js, which also detects recursive causes, can use JS object
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/// comparisons to compare errors. We don't have access to JS object identity in
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/// format_js_error().
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fn errors_are_equal_without_cause(a: &JsError, b: &JsError) -> bool {
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a.name == b.name
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&& a.message == b.message
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&& a.stack == b.stack
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// `a.cause == b.cause` omitted, because it is absent in recursive errors,
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// despite the error being identical to a previously seen one.
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&& a.exception_message == b.exception_message
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&& a.frames == b.frames
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&& a.source_line == b.source_line
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&& a.source_line_frame_index == b.source_line_frame_index
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&& a.aggregated == b.aggregated
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}
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#[derive(Debug, Clone)]
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struct ErrorReference<'a> {
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from: &'a JsError,
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to: &'a JsError,
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}
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#[derive(Debug, Clone)]
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struct IndexedErrorReference<'a> {
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reference: ErrorReference<'a>,
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index: usize,
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}
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// Keep in sync with `/core/error.js`.
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pub fn format_location(frame: &JsStackFrame) -> String {
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let _internal = frame
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.file_name
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.as_ref()
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.map(|f| f.starts_with("ext:"))
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.unwrap_or(false);
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if frame.is_native {
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return cyan("native").to_string();
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}
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let mut result = String::new();
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let file_name = frame.file_name.clone().unwrap_or_default();
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if !file_name.is_empty() {
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result += &cyan(&format_file_name(&file_name)).to_string();
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} else {
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if frame.is_eval {
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result +=
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&(cyan(&frame.eval_origin.as_ref().unwrap()).to_string() + ", ");
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}
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result += &cyan("<anonymous>").to_string();
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}
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if let Some(line_number) = frame.line_number {
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write!(result, ":{}", yellow(&line_number.to_string())).unwrap();
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if let Some(column_number) = frame.column_number {
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write!(result, ":{}", yellow(&column_number.to_string())).unwrap();
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}
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}
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result
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}
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fn format_frame(frame: &JsStackFrame) -> String {
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let _internal = frame
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.file_name
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.as_ref()
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.map(|f| f.starts_with("ext:"))
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.unwrap_or(false);
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let is_method_call =
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!(frame.is_top_level.unwrap_or_default() || frame.is_constructor);
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let mut result = String::new();
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if frame.is_async {
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result += "async ";
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}
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if frame.is_promise_all {
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result += &italic_bold(&format!(
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"Promise.all (index {})",
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frame.promise_index.unwrap_or_default()
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))
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.to_string();
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return result;
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}
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if is_method_call {
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let mut formatted_method = String::new();
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if let Some(function_name) = &frame.function_name {
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if let Some(type_name) = &frame.type_name {
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if !function_name.starts_with(type_name) {
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write!(formatted_method, "{type_name}.").unwrap();
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}
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}
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formatted_method += function_name;
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if let Some(method_name) = &frame.method_name {
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if !function_name.ends_with(method_name) {
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write!(formatted_method, " [as {method_name}]").unwrap();
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}
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}
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} else {
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if let Some(type_name) = &frame.type_name {
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write!(formatted_method, "{type_name}.").unwrap();
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}
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if let Some(method_name) = &frame.method_name {
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formatted_method += method_name
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} else {
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formatted_method += "<anonymous>";
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}
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}
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result += &italic_bold(&formatted_method).to_string();
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} else if frame.is_constructor {
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result += "new ";
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if let Some(function_name) = &frame.function_name {
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write!(result, "{}", italic_bold(&function_name)).unwrap();
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} else {
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result += &cyan("<anonymous>").to_string();
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}
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} else if let Some(function_name) = &frame.function_name {
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result += &italic_bold(&function_name).to_string();
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} else {
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result += &format_location(frame);
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return result;
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}
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write!(result, " ({})", format_location(frame)).unwrap();
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result
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}
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/// Take an optional source line and associated information to format it into
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/// a pretty printed version of that line.
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fn format_maybe_source_line(
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source_line: Option<&str>,
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column_number: Option<i64>,
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is_error: bool,
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level: usize,
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) -> String {
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if source_line.is_none() || column_number.is_none() {
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return "".to_string();
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}
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let source_line = source_line.unwrap();
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// sometimes source_line gets set with an empty string, which then outputs
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// an empty source line when displayed, so need just short circuit here.
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if source_line.is_empty() {
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return "".to_string();
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}
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if source_line.contains("Couldn't format source line: ") {
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return format!("\n{source_line}");
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}
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let mut s = String::new();
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let column_number = column_number.unwrap();
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if column_number as usize > source_line.len() {
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return format!(
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"\n{} Couldn't format source line: Column {} is out of bounds (source may have changed at runtime)",
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yellow("Warning"), column_number,
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);
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}
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for _i in 0..(column_number - 1) {
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if source_line.chars().nth(_i as usize).unwrap() == '\t' {
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s.push('\t');
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} else {
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s.push(' ');
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}
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}
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s.push('^');
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let color_underline = if is_error {
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red(&s).to_string()
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} else {
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cyan(&s).to_string()
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};
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let indent = format!("{:indent$}", "", indent = level);
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format!("\n{indent}{source_line}\n{indent}{color_underline}")
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}
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fn find_recursive_cause(js_error: &JsError) -> Option<ErrorReference> {
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let mut history = Vec::<&JsError>::new();
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let mut current_error: &JsError = js_error;
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while let Some(cause) = ¤t_error.cause {
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history.push(current_error);
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if let Some(seen) = history
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.iter()
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.find(|&el| errors_are_equal_without_cause(el, cause.as_ref()))
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{
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return Some(ErrorReference {
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from: current_error,
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to: seen,
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});
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} else {
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current_error = cause;
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}
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}
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None
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}
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fn format_aggregated_error(
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aggregated_errors: &Vec<JsError>,
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circular_reference_index: usize,
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) -> String {
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let mut s = String::new();
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let mut nested_circular_reference_index = circular_reference_index;
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for js_error in aggregated_errors {
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let aggregated_circular = find_recursive_cause(js_error);
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if aggregated_circular.is_some() {
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nested_circular_reference_index += 1;
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}
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let error_string = format_js_error_inner(
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js_error,
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aggregated_circular.map(|reference| IndexedErrorReference {
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reference,
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index: nested_circular_reference_index,
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}),
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false,
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);
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for line in error_string.trim_start_matches("Uncaught ").lines() {
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write!(s, "\n {line}").unwrap();
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}
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}
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s
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}
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fn format_js_error_inner(
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js_error: &JsError,
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circular: Option<IndexedErrorReference>,
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include_source_code: bool,
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) -> String {
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let mut s = String::new();
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s.push_str(&js_error.exception_message);
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if let Some(circular) = &circular {
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if errors_are_equal_without_cause(js_error, circular.reference.to) {
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write!(s, " {}", cyan(format!("<ref *{}>", circular.index))).unwrap();
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}
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}
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if let Some(aggregated) = &js_error.aggregated {
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let aggregated_message = format_aggregated_error(
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aggregated,
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circular
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.as_ref()
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.map(|circular| circular.index)
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.unwrap_or(0),
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);
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s.push_str(&aggregated_message);
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}
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let column_number = js_error
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.source_line_frame_index
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.and_then(|i| js_error.frames.get(i).unwrap().column_number);
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s.push_str(&format_maybe_source_line(
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if include_source_code {
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js_error.source_line.as_deref()
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} else {
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None
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},
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column_number,
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true,
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0,
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));
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for frame in &js_error.frames {
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write!(s, "\n at {}", format_frame(frame)).unwrap();
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}
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if let Some(cause) = &js_error.cause {
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let is_caused_by_circular = circular
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.as_ref()
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.map(|circular| {
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errors_are_equal_without_cause(circular.reference.from, js_error)
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})
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.unwrap_or(false);
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let error_string = if is_caused_by_circular {
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cyan(format!("[Circular *{}]", circular.unwrap().index)).to_string()
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} else {
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format_js_error_inner(cause, circular, false)
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};
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write!(
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s,
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"\nCaused by: {}",
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error_string.trim_start_matches("Uncaught ")
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)
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.unwrap();
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}
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s
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}
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/// Format a [`JsError`] for terminal output.
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pub fn format_js_error(js_error: &JsError) -> String {
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let circular =
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find_recursive_cause(js_error).map(|reference| IndexedErrorReference {
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reference,
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index: 1,
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});
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format_js_error_inner(js_error, circular, true)
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use test_util::strip_ansi_codes;
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#[test]
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fn test_format_none_source_line() {
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let actual = format_maybe_source_line(None, None, false, 0);
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assert_eq!(actual, "");
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}
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#[test]
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fn test_format_some_source_line() {
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let actual =
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format_maybe_source_line(Some("console.log('foo');"), Some(9), true, 0);
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assert_eq!(
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strip_ansi_codes(&actual),
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"\nconsole.log(\'foo\');\n ^"
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);
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}
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}
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