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mod.rs
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mod.rs
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mod binding_files;
mod build_tables;
mod char_tree;
mod dedup;
mod grammars;
mod nfa;
mod node_types;
pub mod parse_grammar;
mod prepare_grammar;
mod render;
mod rules;
mod tables;
use self::build_tables::build_tables;
use self::grammars::{InlinedProductionMap, LexicalGrammar, SyntaxGrammar};
use self::parse_grammar::parse_grammar;
use self::prepare_grammar::prepare_grammar;
use self::render::render_c_code;
use self::rules::AliasMap;
use anyhow::{anyhow, Context, Result};
use lazy_static::lazy_static;
use regex::{Regex, RegexBuilder};
use semver::Version;
use std::fs;
use std::io::Write;
use std::path::{Path, PathBuf};
use std::process::{Command, Stdio};
lazy_static! {
static ref JSON_COMMENT_REGEX: Regex = RegexBuilder::new("^\\s*//.*")
.multi_line(true)
.build()
.unwrap();
}
struct GeneratedParser {
c_code: String,
node_types_json: String,
}
pub fn generate_parser_in_directory(
repo_path: &PathBuf,
grammar_path: Option<&str>,
abi_version: usize,
generate_bindings: bool,
report_symbol_name: Option<&str>,
) -> Result<()> {
let src_path = repo_path.join("src");
let header_path = src_path.join("tree_sitter");
// Ensure that the output directories exist.
fs::create_dir_all(&src_path)?;
fs::create_dir_all(&header_path)?;
// Read the grammar.json.
let grammar_json;
match grammar_path {
Some(path) => {
grammar_json = load_grammar_file(path.as_ref())?;
}
None => {
let grammar_js_path = grammar_path.map_or(repo_path.join("grammar.js"), |s| s.into());
grammar_json = load_grammar_file(&grammar_js_path)?;
fs::write(&src_path.join("grammar.json"), &grammar_json)?;
}
}
// Parse and preprocess the grammar.
let input_grammar = parse_grammar(&grammar_json)?;
let (syntax_grammar, lexical_grammar, inlines, simple_aliases) =
prepare_grammar(&input_grammar)?;
let language_name = input_grammar.name;
// Generate the parser and related files.
let GeneratedParser {
c_code,
node_types_json,
} = generate_parser_for_grammar_with_opts(
&language_name,
syntax_grammar,
lexical_grammar,
inlines,
simple_aliases,
abi_version,
report_symbol_name,
)?;
write_file(&src_path.join("parser.c"), c_code)?;
write_file(&src_path.join("node-types.json"), node_types_json)?;
write_file(&header_path.join("parser.h"), tree_sitter::PARSER_HEADER)?;
if generate_bindings {
binding_files::generate_binding_files(&repo_path, &language_name)?;
}
Ok(())
}
pub fn generate_parser_for_grammar(grammar_json: &str) -> Result<(String, String)> {
let grammar_json = JSON_COMMENT_REGEX.replace_all(grammar_json, "\n");
let input_grammar = parse_grammar(&grammar_json)?;
let (syntax_grammar, lexical_grammar, inlines, simple_aliases) =
prepare_grammar(&input_grammar)?;
let parser = generate_parser_for_grammar_with_opts(
&input_grammar.name,
syntax_grammar,
lexical_grammar,
inlines,
simple_aliases,
tree_sitter::LANGUAGE_VERSION,
None,
)?;
Ok((input_grammar.name, parser.c_code))
}
fn generate_parser_for_grammar_with_opts(
name: &String,
syntax_grammar: SyntaxGrammar,
lexical_grammar: LexicalGrammar,
inlines: InlinedProductionMap,
simple_aliases: AliasMap,
abi_version: usize,
report_symbol_name: Option<&str>,
) -> Result<GeneratedParser> {
let variable_info =
node_types::get_variable_info(&syntax_grammar, &lexical_grammar, &simple_aliases)?;
let node_types_json = node_types::generate_node_types_json(
&syntax_grammar,
&lexical_grammar,
&simple_aliases,
&variable_info,
);
let (parse_table, main_lex_table, keyword_lex_table, keyword_capture_token) = build_tables(
&syntax_grammar,
&lexical_grammar,
&simple_aliases,
&variable_info,
&inlines,
report_symbol_name,
)?;
let c_code = render_c_code(
name,
parse_table,
main_lex_table,
keyword_lex_table,
keyword_capture_token,
syntax_grammar,
lexical_grammar,
simple_aliases,
abi_version,
);
Ok(GeneratedParser {
c_code,
node_types_json: serde_json::to_string_pretty(&node_types_json).unwrap(),
})
}
pub fn load_grammar_file(grammar_path: &Path) -> Result<String> {
match grammar_path.extension().and_then(|e| e.to_str()) {
Some("js") => Ok(load_js_grammar_file(grammar_path)?),
Some("json") => Ok(fs::read_to_string(grammar_path)?),
_ => Err(anyhow!(
"Unknown grammar file extension: {:?}",
grammar_path
)),
}
}
fn load_js_grammar_file(grammar_path: &Path) -> Result<String> {
let grammar_path = fs::canonicalize(grammar_path)?;
let mut node_process = Command::new("node")
.env("TREE_SITTER_GRAMMAR_PATH", grammar_path)
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.spawn()
.expect("Failed to run `node`");
let mut node_stdin = node_process
.stdin
.take()
.expect("Failed to open stdin for node");
let cli_version = Version::parse(env!("CARGO_PKG_VERSION"))
.expect("Could not parse this package's version as semver.");
write!(
node_stdin,
"global.TREE_SITTER_CLI_VERSION_MAJOR = {};
global.TREE_SITTER_CLI_VERSION_MINOR = {};
global.TREE_SITTER_CLI_VERSION_PATCH = {};",
cli_version.major, cli_version.minor, cli_version.patch,
)
.expect("Failed to write tree-sitter version to node's stdin");
let javascript_code = include_bytes!("./dsl.js");
node_stdin
.write(javascript_code)
.expect("Failed to write grammar dsl to node's stdin");
drop(node_stdin);
let output = node_process
.wait_with_output()
.expect("Failed to read output from node");
match output.status.code() {
None => panic!("Node process was killed"),
Some(0) => {}
Some(code) => return Err(anyhow!("Node process exited with status {}", code)),
}
let mut result = String::from_utf8(output.stdout).expect("Got invalid UTF8 from node");
result.push('\n');
Ok(result)
}
fn write_file(path: &Path, body: impl AsRef<[u8]>) -> Result<()> {
fs::write(path, body)
.with_context(|| format!("Failed to write {:?}", path.file_name().unwrap()))
}