ninja-build/ninja

14.1

Adjusted Score

14.1

Raw Score

100%

Time Factor

2026-07-25

Last Push

13.1K

Stars

C++

Language

12.0K

Lines of Code

Files

147

Pattern Hits

2026-08-02

Scan Date

0.09

HC Hit Rate

What These Metrics Mean

Adjusted Score: Primary synthetic code indicator. Raw score normalised per 1,000 lines of code and multiplied by the temporal discount factor. This is the definitive comparative metric — use it to rank repositories by AI authorship density.
Raw Score: The unmodified sum of all severity-weighted, context-multiplied pattern match scores before temporal discounting. Reflects the absolute signal strength independent of when the repository was last active.
Time Factor: The temporal discount multiplier (0–100%) applied to the raw score. Repositories last updated before ChatGPT's launch (Nov 2022) receive a 5% factor. Full signal is only assigned to repositories active in the post-adoption era (Jan 2024+).
Pattern Hits: Total count of individual pattern matches across all files and categories. A high hit count with a low score may indicate a very large codebase with isolated AI snippets; a low count with a high score indicates dense, concentrated AI signatures.
HC Hit Rate: High+Critical pattern hits per file, averaged across the repository. This orthogonal signal catches repositories where a few files are densely packed with high-severity AI tells — a strong indicator even when the normalised score appears moderate due to codebase size.
Lines of Code / Files: Total lines and files analysed. The scanner examines 94 file extensions. These denominators are used to normalise the score, enabling fair comparison between repositories of vastly different sizes.

Score History

Longitudinal tracking requires multiple scan runs. Once this repository is re-scanned after new commits land, this chart will visualise how the synthetic code signal evolves over time — enabling you to detect whether AI authorship is growing, stabilising, or being actively corrected by human engineers.

No multi-scan history yet — run the scanner again to build trend data.

Severity Breakdown

Classifies detected patterns by their diagnostic confidence and structural impact. CRITICAL patterns (coefficient 10) represent definitive synthetic signatures — hallucinated imports, explicit LLM attribution metadata — virtually never produced by human authors. HIGH (5) indicates strong structural tells such as cross-file repetition or cross-linguistic idioms. MEDIUM (2) covers recognisable conversational padding and AI-specific vocabulary. LOW (1) captures subtle indicators like tautological comments and generic boilerplate that require density to carry independent signal.

CRITICAL 0HIGH 7MEDIUM 1LOW 139

Directory Score Breakdown

This horizontal bar chart decomposes the repository's raw synthetic code score by top-level directory, allowing you to pinpoint precisely which modules or components carry the highest AI authorship density. Directories with disproportionately high scores relative to their size warrant targeted manual review: concentrated AI signatures often trace back to mass-generated configuration layers, auto-ported test suites, LLM-scaffolded boilerplate classes, or entire subsystems authored under heavy copilot assistance. Use this view to prioritise your human code-review effort.

Pattern Findings

The scanner identified 147 distinct pattern matches across 10 syntactic categories. Each entry below represents a discrete location in the source code where the engine recorded a statistically significant AI authorship indicator. Expand any category row to inspect the individual file paths, line numbers, code snippets, and the lexical context (CODE, COMMENT, or STRING) in which each match was detected.

Reading the findings table: The Severity column indicates the diagnostic confidence level (CRITICAL / HIGH / MEDIUM / LOW). The Context column identifies whether the match occurred inside executable code, an inline comment, or a string literal — comment-context matches receive a ×1.5 weight because LLMs systematically over-annotate. The ⚡ bolt icon marks clustered matches: three or more patterns within a 10-line window, each receiving an additional ×1.5 density multiplier as dense clusters constitute far stronger evidence of synthetic authorship than isolated hits.

Over-Commented Block94 hits · 94 pts

Severity	File	Line	Snippet	Context
LOW	configure.py	1	#!/usr/bin/env python3	COMMENT
LOW	misc/ninja_syntax_test.py	1	#!/usr/bin/env python3	COMMENT
LOW	misc/measure.py	1	#!/usr/bin/env python3	COMMENT
LOW	misc/jobserver_test.py	1	#!/usr/bin/env python3	COMMENT
LOW	misc/ninja_syntax.py	1	#!/usr/bin/python	COMMENT
LOW	misc/jobserver_test_helper.py	1	#!/usr/bin/env python3	COMMENT
LOW	misc/jobserver_pool.py	1	#!/usr/bin/env python3	COMMENT
LOW	misc/jobserver_pool.py	41	#	COMMENT
LOW	misc/output_test.py	21	default_env.pop('NINJA_STATUS', None)	COMMENT
LOW	misc/output_test.py	41	# [ '\r', 'FOO\x1b[K\r', 'BAR\x1b[K\r', 'ZOO\x1b[K\r\n' ]	COMMENT
LOW	misc/oss-fuzz/build.sh	1	#!/bin/bash -eu	COMMENT
LOW	src/browse.py	1	#!/usr/bin/env python3	COMMENT
LOW	src/browse.py	41	except ImportError:	COMMENT
LOW	src/edit_distance.h	1	// Copyright 2011 Google Inc. All Rights Reserved.	COMMENT
LOW	src/graphviz.h	1	// Copyright 2011 Google Inc. All Rights Reserved.	COMMENT
LOW	src/manifest_parser.h	1	// Copyright 2011 Google Inc. All Rights Reserved.	COMMENT
LOW	src/version.h	1	// Copyright 2013 Google Inc. All Rights Reserved.	COMMENT
LOW	src/status.h	1	// Copyright 2016 Google Inc. All Rights Reserved.	COMMENT
LOW	src/build_log.h	1	// Copyright 2011 Google Inc. All Rights Reserved.	COMMENT
LOW	src/build_log.h	21	#include <string>	COMMENT
LOW	src/hash_map.h	1	// Copyright 2011 Google Inc. All Rights Reserved.	COMMENT
LOW	src/dyndep_parser.h	1	// Copyright 2015 Google Inc. All Rights Reserved.	COMMENT
LOW	src/includes_normalize.h	1	// Copyright 2012 Google Inc. All Rights Reserved.	COMMENT
LOW	src/clean.h	1	// Copyright 2011 Google Inc. All Rights Reserved.	COMMENT
LOW	src/clean.h	41	int CleanTarget(const char* target);	COMMENT
LOW	src/dyndep.h	1	// Copyright 2015 Google Inc. All Rights Reserved.	COMMENT
LOW	src/exit_status.h	1	// Copyright 2011 Google Inc. All Rights Reserved.	COMMENT
LOW	src/build.h	1	// Copyright 2011 Google Inc. All Rights Reserved.	COMMENT
LOW	src/build.h	121	/// Update plan with knowledge that the given node is up to date.	COMMENT
LOW	src/parser.h	1	// Copyright 2018 Google Inc. All Rights Reserved.	COMMENT
LOW	src/clparser.h	1	// Copyright 2015 Google Inc. All Rights Reserved.	COMMENT
LOW	src/clparser.h	21	/// Visual Studio's cl.exe requires some massaging to work with Ninja;	COMMENT
LOW	src/command_collector.h	1	// Copyright 2024 Google Inc. All Rights Reserved.	COMMENT
LOW	src/command_collector.h	21		COMMENT
LOW	src/depfile_parser.h	1	// Copyright 2011 Google Inc. All Rights Reserved.	COMMENT
LOW	src/build_result.h	1	// Copyright 2026 Google Inc. All Rights Reserved.	COMMENT
LOW	src/elide_middle.h	1	// Copyright 2024 Google Inc. All Rights Reserved.	COMMENT
LOW	src/elide_middle.h	21	/// Elide the given string @a str with '...' in the middle if the length	COMMENT
LOW	src/test.h	1	// Copyright 2011 Google Inc. All Rights Reserved.	COMMENT
LOW	src/inline.sh	1	#!/bin/sh	COMMENT
LOW	src/missing_deps.h	1	// Copyright 2019 Google Inc. All Rights Reserved.	COMMENT
LOW	src/string_piece.h	1	// Copyright 2011 Google Inc. All Rights Reserved.	COMMENT
LOW	src/eval_env.h	1	// Copyright 2011 Google Inc. All Rights Reserved.	COMMENT
LOW	src/graph.h	1	// Copyright 2011 Google Inc. All Rights Reserved.	COMMENT
LOW	src/graph.h	141	/// The path is an actual file. mtime_ will be the file's mtime.	COMMENT
LOW	src/graph.h	461		COMMENT
LOW	src/graph.h	481	/// - Call VisitNode() for each root node to collect inputs from.	COMMENT
LOW	src/status_printer.h	1	// Copyright 2016 Google Inc. All Rights Reserved.	COMMENT
LOW	src/msvc_helper.h	1	// Copyright 2011 Google Inc. All Rights Reserved.	COMMENT
LOW	src/deps_log.h	1	// Copyright 2012 Google Inc. All Rights Reserved.	COMMENT
LOW	src/deps_log.h	21	#include <stdio.h>	COMMENT
LOW	src/deps_log.h	41	/// help guide the design space. The total text in the files sums to	COMMENT
LOW	src/gen_doxygen_mainpage.sh	1	#!/bin/sh	COMMENT
LOW	src/string_piece_util.h	1	// Copyright 2017 Google Inc. All Rights Reserved.	COMMENT
LOW	src/json.h	1	// Copyright 2021 Google Inc. All Rights Reserved.	COMMENT
LOW	src/load_status.h	1	// Copyright 2019 Google Inc. All Rights Reserved.	COMMENT
LOW	src/util.h	1	// Copyright 2011 Google Inc. All Rights Reserved.	COMMENT
LOW	src/util.h	21	#include <stdint.h>	COMMENT
LOW	src/util.h	41		COMMENT
LOW	src/util.h	101	/// @return the load average of the machine. A negative value is returned	COMMENT
34 more matches not shown…

Cross-Language Confusion7 hits · 35 pts

Severity	File	Line	Snippet	Context
HIGH	misc/output_test.py	175	command = sleep $delay && echo $out	STRING
HIGH⚡	misc/output_test.py	363	command = touch $out && echo "$out: extra" > $depfile	CODE
HIGH⚡	misc/output_test.py	370	[1/1] touch somewhere/out && echo "somewhere/out: extra" > somewhere_else/out.d	CODE
HIGH⚡	misc/output_test.py	423	build out3 : cat out2 out1 \| implicit \|\| order_only	CODE
HIGH	misc/output_test.py	635	build out: touch \|\| dd	CODE
HIGH	misc/output_test.py	687	build stamp-1: touch \|\| dd-1	STRING
HIGH	misc/output_test.py	689	build stamp-2: touch \|\| dd-2	STRING

Hyper-Verbose Identifiers31 hits · 22 pts

Severity	File	Line	Snippet	Context
LOW	misc/ninja_syntax_test.py	55	def test_short_words_indented(self) -> None:	CODE
LOW	misc/ninja_syntax_test.py	67	def test_few_long_words_indented(self) -> None:	STRING
LOW⚡	misc/ninja_syntax_test.py	101	def test_embedded_dollar_dollar(self) -> None:	STRING
LOW⚡	misc/ninja_syntax_test.py	110	def test_two_embedded_dollar_dollars(self) -> None:	STRING
LOW⚡	misc/ninja_syntax_test.py	119	def test_leading_dollar_dollar(self) -> None:	STRING
LOW⚡	misc/ninja_syntax_test.py	128	def test_trailing_dollar_dollar(self) -> None:	STRING
LOW	misc/jobserver_test.py	154	def generate_double_build_plan(	STRING
LOW	misc/jobserver_test.py	193	def get_spans_for_multiple_builds(build_dirs: T.List[str], command_counts: T.List[int]) -> T.List[T.Tuple[int, int]]:	STRING
LOW	misc/jobserver_test.py	219	def compute_max_overlapped_spans(build_dir: str, command_count: int) -> int:	STRING
LOW	misc/jobserver_test.py	328	def test_jobserver_client_with_posix_fifo(self):	STRING
LOW	misc/jobserver_test.py	332	def test_jobserver_client_with_posix_pipe(self):	STRING
LOW	misc/jobserver_test.py	347	def run_ninja_with_jobserver_pipe(args):	STRING
LOW	misc/jobserver_test.py	371	def test_jobserver_client_with_posix_fifo_token_efficiency(self):	STRING
LOW	misc/ninja_syntax.py	155	def _count_dollars_before_index(self, s: str, i: int) -> int:	CODE
LOW⚡	misc/output_test.py	360	def test_depfile_directory_creation(self) -> None:	STRING
LOW⚡	misc/output_test.py	380	def test_ninja_status_default(self) -> None:	STRING
LOW⚡	misc/output_test.py	395	def test_status_flag_without_description(self) -> None:	STRING
LOW⚡	misc/output_test.py	401	def test_status_flag_description_placement(self) -> None:	STRING
LOW⚡	misc/output_test.py	407	def test_status_flag_unknown_variable(self) -> None:	STRING
LOW⚡	misc/output_test.py	413	def test_entering_directory_on_stdout(self) -> None:	STRING
LOW	tests/compdb/test_compdb_validation.py	45	def test_compdb_excludes_validation_edge(self):	CODE
LOW	tests/compdb/test_compdb_validation.py	63	def test_compdb_with_rule_filter_excludes_validation(self):	STRING
LOW	tests/compdb/test_compdb_validation.py	79	def test_compdb_keeps_non_validation_edge(self):	STRING
LOW	tests/compdb/test_compdb_validation.py	97	def test_compdb_targets_excludes_validation_edge(self):	STRING
LOW	tests/compdb/test_compdb_validation.py	113	def test_compdb_mixed_validation_and_input(self):	STRING
LOW	tests/builddir_target/test_builddir_target.py	48	def test_exact_match_takes_priority(self):	CODE
LOW	tests/builddir_target/test_builddir_target.py	75	def test_no_builddir_no_fallback(self):	CODE
LOW	tests/builddir_target/test_builddir_target.py	89	def test_fallback_with_subdirectory(self):	CODE
LOW	tests/builddir_target/test_builddir_target.py	105	def test_fallback_miss_still_errors(self):	CODE
LOW	tests/restat/test_restat_builddir.py	30	def test_restat_with_builddir(self):	CODE
LOW	src/browse.py	166	class RequestHandler(httpserver.BaseHTTPRequestHandler):	STRING

Deep Nesting6 hits · 6 pts

Severity	File	Line	Context
LOW	configure.py	39	CODE
LOW	misc/ninja_syntax.py	164	CODE
LOW	misc/jobserver_pool_test.py	24	CODE
LOW	misc/jobserver_pool.py	240	CODE
LOW	src/browse.py	69	CODE
LOW	src/browse.py	134	CODE

Self-Referential Comments1 hit · 3 pts

Severity	File	Line	Snippet	Context
MEDIUM	tests/restat/test_restat_builddir.py	33	# Create a simple build.ninja file with builddir	COMMENT

Excessive Try-Catch Wrapping2 hits · 2 pts

Severity	File	Line	Snippet	Context
LOW	configure.py	387	except Exception:	CODE
LOW	misc/ci.py	22	except Exception:	CODE

AI Structural Patterns2 hits · 2 pts

Severity	File	Line	Snippet	Context
LOW	misc/ninja_syntax.py	61		CODE
LOW	tests/builddir_target/test_builddir_target.py	30		CODE

Unused Imports2 hits · 2 pts

Severity	File	Line	Snippet	Context
LOW	misc/jobserver_pool_test.py	10		CODE
LOW	misc/jobserver_pool.py	60		CODE

Redundant / Tautological Comments1 hit · 2 pts

Severity	File	Line	Snippet	Context
LOW	misc/jobserver_test.py	33	# Set this to True to debug command invocations.	COMMENT

AI Slop Vocabulary1 hit · 2 pts

Severity	File	Line	Snippet	Context
LOW	misc/ninja_syntax.py	181	# No such space; just use the first unescaped space we can find.	COMMENT

Analysis Overview

What These Metrics Mean

Score History

Severity Breakdown

Directory Score Breakdown

Pattern Findings