chore: add SPDX license headers to all hand-written source files

benches/benches/char_stream.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 //! Character-stream benchmarks.
 //!
 //! Every generated lexer walks an [`InputStream`] one code point at a time, so

benches/benches/grammar_frontend.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 //! End-to-end benchmarks for the `ANTLRv4` grammar frontend.
 //!
 //! Parsing a `.g4` source drives the whole runtime stack in one call: the

crates/antlr-rust-codegen/src/artifact.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::{BTreeMap, BTreeSet, btree_map::Entry};
 use std::fs;
 use std::io;

crates/antlr-rust-codegen/src/bin/antlr4-rust-gen.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 fn main() -> miette::Result<()> {
     antlr_rust_codegen::run_cli()
 }

crates/antlr-rust-codegen/src/bin/antlr4-rust-testrig.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 fn main() -> miette::Result<std::process::ExitCode> {
     antlr_rust_codegen::run_testrig_cli()
 }

crates/antlr-rust-codegen/src/builder.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::BTreeSet;
 use std::path::{Path, PathBuf};
 

crates/antlr-rust-codegen/src/cli.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::io::{self, IsTerminal as _, Write as _};
 use std::path::PathBuf;
 use std::time::Duration;

crates/antlr-rust-codegen/src/cli_report.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::error::Error as StdError;
 use std::fmt;
 use std::fs;

crates/antlr-rust-codegen/src/config.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::BTreeSet;
 use std::path::PathBuf;
 

crates/antlr-rust-codegen/src/driver.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use crate::config::CompilerConfig;
 use crate::generator::prelude::*;
 use crate::lexer::{LexerRenderModel, render_lexer_model};

crates/antlr-rust-codegen/src/embedded/antlr4rust/aliases.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use super::{Range, RustDelimiterMap, RustLexeme, RustLexemeKind, RustReplacement, io};
 
 pub(crate) fn recog_input_replacement(

crates/antlr-rust-codegen/src/embedded/antlr4rust/macros.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use super::{
     BTreeSet, Cow, FormatMacroCaptures, Range, RustDelimiterMap, RustLexeme, RustLexemeKind,
     RustReplacement, io, is_turbofish_open, is_unqualified_identifier, lex_rust_body, lexeme_text,

crates/antlr-rust-codegen/src/embedded/antlr4rust/mod.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 mod aliases;
 mod macros;
 mod scopes;

crates/antlr-rust-codegen/src/embedded/antlr4rust/scopes.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use super::*;
 
 impl AliasBindingScopes {

crates/antlr-rust-codegen/src/embedded/members.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use super::{
     ANTLR4RUST_INPUT_FACADE, Antlr4RustSourceKind, BTreeSet, MemberField, MemberItem, MembersModel,
     Range, RustDelimiterMap, RustLexeme, RustLexemeKind, SourceId, io, lex_rust_body, lexeme_text,

crates/antlr-rust-codegen/src/embedded/mod.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 //! Embedded-action grammar model and `$`-attribute translator.
 //!
 //! In embedded mode the generator receives a grammar whose actions and

crates/antlr-rust-codegen/src/embedded/model.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use super::*;
 
 /// One `name: type` attribute declared in a rule's `[...]` args clause or

crates/antlr-rust-codegen/src/embedded/translate.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use super::*;
 
 /// Context for translating one action/predicate body.

crates/antlr-rust-codegen/src/error.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::fmt;
 use std::io;
 use std::ops::Range;

crates/antlr-rust-codegen/src/generator/tests.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 #![allow(clippy::disallowed_methods)] // `insta` assertion macros unwrap internal I/O.
 use super::*;
 use antlr4_runtime::atn::parser_atn::{ParserAtnBuilder, ParserTransitionSpec};

crates/antlr-rust-codegen/src/grammar/action.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
 pub(crate) struct ActionReference<'a> {
     pub(crate) kind: ActionReferenceKind<'a>,

crates/antlr-rust-codegen/src/grammar/atn/analysis.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::{BTreeMap, BTreeSet};
 
 use antlr4_runtime::atn::AtnStateKind;

crates/antlr-rust-codegen/src/grammar/atn/build.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::BTreeMap;
 
 use antlr4_runtime::atn::AtnStateKind;

crates/antlr-rust-codegen/src/grammar/atn/general_bug_test.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::{BTreeMap, BTreeSet, VecDeque};
 use std::fmt::Write as _;
 use std::path::{Path, PathBuf};

crates/antlr-rust-codegen/src/grammar/atn/interp_test.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::BTreeMap;
 use std::fmt::Write;
 

crates/antlr-rust-codegen/src/grammar/atn/lexer.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::{BTreeMap, BTreeSet};
 
 use antlr4_runtime::atn::lexer_dfa::CompiledLexerDfa;

crates/antlr-rust-codegen/src/grammar/atn/mod.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 mod analysis;
 mod build;
 #[cfg(test)]

crates/antlr-rust-codegen/src/grammar/atn/optimize.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::BTreeSet;
 
 use antlr4_runtime::atn::AtnStateKind;

crates/antlr-rust-codegen/src/grammar/atn/parser.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::BTreeMap;
 
 use antlr4_runtime::atn::AtnStateKind;

crates/antlr-rust-codegen/src/grammar/char_support.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use antlr4_runtime::atn::IntervalSet;
 
 use super::unicode::simple_uppercase;

crates/antlr-rust-codegen/src/grammar/compiler.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::BTreeMap;
 
 use super::action::{ActionReferenceParser, action_references};

crates/antlr-rust-codegen/src/grammar/diagnostic.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::fmt;
 use std::path::PathBuf;
 

crates/antlr-rust-codegen/src/grammar/escape_sequence.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use antlr4_runtime::atn::IntervalSet;
 
 use super::unicode::property_ranges;

crates/antlr-rust-codegen/src/grammar/integration.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::{BTreeMap, BTreeSet};
 
 use super::char_support::get_char_value_from_grammar_char_literal;

crates/antlr-rust-codegen/src/grammar/left_recursion.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::BTreeSet;
 
 use super::diagnostic::Diagnostic;

crates/antlr-rust-codegen/src/grammar/loader.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::{BTreeMap, BTreeSet};
 use std::fs;
 use std::path::{Path, PathBuf};

crates/antlr-rust-codegen/src/grammar/mod.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 pub(crate) mod action;
 pub(crate) mod atn;
 mod char_support;

crates/antlr-rust-codegen/src/grammar/model.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::BTreeMap;
 
 use super::frontend::{SourceId, SourceSpan, SyntaxId};

crates/antlr-rust-codegen/src/grammar/mutual_recursion.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 //! Mutual (indirect) left-recursion elimination — issue #151.
 //!
 //! ANTLR 4 rewrites *direct* left recursion (`e : e '+' e | INT`) into a

crates/antlr-rust-codegen/src/grammar/provenance.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::BTreeMap;
 
 use super::frontend::{SourceSpan, SyntaxId};

crates/antlr-rust-codegen/src/grammar/rule_reachability.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::{BTreeMap, BTreeSet};
 
 use petgraph::algo::tarjan_scc;

crates/antlr-rust-codegen/src/grammar/semantics.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::{BTreeMap, BTreeSet};
 use std::fs;
 

crates/antlr-rust-codegen/src/grammar/semantics/attributes.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::{BTreeMap, BTreeSet};
 
 use crate::grammar::diagnostic::Diagnostic;

crates/antlr-rust-codegen/src/grammar/semantics/bindings.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::BTreeMap;
 
 use crate::grammar::action::{ActionReference, ActionReferenceKind, ActionReferenceParser};

crates/antlr-rust-codegen/src/grammar/source.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::BTreeMap;
 use std::path::{Path, PathBuf};
 use std::rc::Rc;

crates/antlr-rust-codegen/src/grammar/syntax.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use super::char_support::get_string_from_grammar_string_literal;
 use super::frontend::{Cst, SourceFile, SourceSpan, SyntaxId, SyntaxNodeKind, SyntaxToken};
 use super::generated::antlr_v4_parser as p;

crates/antlr-rust-codegen/src/grammar/transform/analysis.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::{BTreeMap, BTreeSet};
 
 use petgraph::algo::tarjan_scc;

crates/antlr-rust-codegen/src/grammar/transform/artifact.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::borrow::Cow;
 use std::collections::BTreeMap;
 

crates/antlr-rust-codegen/src/grammar/transform/mod.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 pub(crate) mod analysis;
 pub(crate) mod artifact;
 mod registry;

crates/antlr-rust-codegen/src/grammar/transform/passes/precedence_ladder.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::{BTreeMap, BTreeSet};
 
 #[cfg(test)]

crates/antlr-rust-codegen/src/grammar/transform/passes/prune_unreachable.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::BTreeSet;
 
 use crate::grammar::diagnostic::Diagnostic;

crates/antlr-rust-codegen/src/grammar/transform/registry.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use super::analysis::TransformAnalysis;
 use super::{
     GrammarTransform, TransformContext, TransformGrammar, TransformReport, TransformReportEntry,

crates/antlr-rust-codegen/src/grammar/unicode.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::HashMap;
 use std::hash::{DefaultHasher, Hash, Hasher};
 use std::sync::{Mutex, OnceLock, PoisonError};

crates/antlr-rust-codegen/src/grammar/unicode_escape.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
 pub(super) enum UnicodeEscapeStyle {
     Utf16CodeUnits,

crates/antlr-rust-codegen/src/grammar/unicode_icu_tests.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use super::{property_ranges, simple_lowercase, simple_uppercase};
 use std::collections::BTreeMap;
 use std::fmt::Write;

crates/antlr-rust-codegen/src/grammar/validation.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::BTreeSet;
 
 use super::diagnostic::Diagnostic;

crates/antlr-rust-codegen/src/json.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use serde::Serialize;
 
 pub(crate) fn to_pretty_json<T: Serialize>(value: &T) -> String {

crates/antlr-rust-codegen/src/lexer/mod.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use crate::generator::prelude::*;
 use crate::semantics::{
     ActionTemplate, CoordinateDispose, PredicateTemplate, SemPatternFile, SemUnknownPolicy,

crates/antlr-rust-codegen/src/lexer/render.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 /// Renders a Rust lexer module that delegates token recognition to the shared
 /// ATN interpreter.
 ///

crates/antlr-rust-codegen/src/lexer/render_model.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 /// Complete, immutable input to lexer Rust emission.
 ///
 /// Constructing this value before calling the renderer keeps CLI/configuration

crates/antlr-rust-codegen/src/lib.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 //! ANTLR v4 grammar compiler and Rust source generator.
 
 mod artifact;

crates/antlr-rust-codegen/src/optimization/config.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::BTreeSet;
 
 use crate::config::CompilerConfig;

crates/antlr-rust-codegen/src/optimization/descriptor.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use crate::grammar::transform::SafetyClass;
 use crate::grammar::transform::passes::precedence_ladder::CollapsePrecedenceLadders;
 use crate::grammar::transform::passes::prune_unreachable::PruneUnreachableRules;

crates/antlr-rust-codegen/src/optimization/metrics.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use crate::grammar::model::{Block, ElementKind, GrammarUnit};
 
 /// Deterministic structural counts captured around an optimization pass.

crates/antlr-rust-codegen/src/optimization/mod.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 mod config;
 mod descriptor;
 pub(crate) mod metrics;

crates/antlr-rust-codegen/src/optimization/report.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2026 Konstantin Vyatkin
 use std::collections::BTreeSet;
 
 use crate::grammar::compiler::Compilation;