extern crate pulldown_cmark as cmark;
extern crate tempdir;
use std::env;
use std::fs::File;
use std::io::Error as IoError;
use std::io::{Read, Write};
use std::path::{PathBuf, Path};
use cmark::{Parser, Event, Tag};
pub fn generate_doc_tests(docs: &[&str]) {
if docs.is_empty() { return; }
let out_dir = env::var("OUT_DIR").unwrap();
let cargo_manifest_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
let mut out_file = PathBuf::from(out_dir.clone());
out_file.push("skeptic-tests.rs");
let config = Config {
out_dir: PathBuf::from(out_dir),
root_dir: PathBuf::from(cargo_manifest_dir),
out_file: out_file,
docs: docs.iter().map(|s| s.to_string()).collect()
};
run(config);
}
struct Config {
out_dir: PathBuf,
root_dir: PathBuf,
out_file: PathBuf,
docs: Vec<String>
}
fn run(ref config: Config) {
let tests = extract_tests(config).unwrap();
emit_tests(config, tests).unwrap();
}
struct Test {
name: String,
text: Vec<String>,
ignore: bool,
should_panic: bool
}
struct DocTestSuite {
doc_tests: Vec<DocTest>
}
struct DocTest {
template: Option<String>,
tests: Vec<Test>
}
fn extract_tests(config: &Config) -> Result<DocTestSuite, IoError> {
let mut doc_tests = Vec::new();
for doc in &config.docs {
let ref mut path = config.root_dir.clone();
path.push(doc);
let new_tests = try!(extract_tests_from_file(path));
doc_tests.push(new_tests);
}
return Ok(DocTestSuite { doc_tests: doc_tests });
}
fn extract_tests_from_file(path: &Path) -> Result<DocTest, IoError> {
let mut tests = Vec::new();
let mut template = None;
let mut file = try!(File::open(path));
let ref mut s = String::new();
try!(file.read_to_string(s));
let parser = Parser::new(s);
let mut test_name_gen = TestNameGen::new(path);
let mut code_buffer = None;
for event in parser {
match event {
Event::Start(Tag::CodeBlock(ref info)) => {
let code_block_info = parse_code_block_info(info);
if code_block_info.is_rust {
code_buffer = Some(Vec::new());
}
}
Event::Text(text) => {
if let Some(ref mut buf) = code_buffer {
buf.push(text.to_string());
}
}
Event::End(Tag::CodeBlock(ref info)) => {
let code_block_info = parse_code_block_info(info);
if let Some(buf) = code_buffer.take() {
if code_block_info.is_template {
template = Some(join_strings(buf))
} else {
tests.push(Test {
name: test_name_gen.advance(),
text: buf,
ignore: code_block_info.ignore,
should_panic: code_block_info.should_panic
});
}
}
}
_ => ()
}
}
Ok(DocTest {
template: template,
tests: tests
})
}
fn join_strings(ss: Vec<String>) -> String {
let mut s_ = String::new();
for s in ss {
s_.push_str(&s)
}
s_
}
struct TestNameGen {
root: String,
count: i32
}
impl TestNameGen {
fn new(path: &Path) -> TestNameGen {
let ref file_stem = path.file_stem().unwrap().to_str().unwrap().to_string();
TestNameGen {
root: sanitize_test_name(file_stem),
count: 0
}
}
fn advance(&mut self) -> String {
let count = self.count;
self.count += 1;
format!("{}_{}", self.root, count)
}
}
fn sanitize_test_name(s: &str) -> String {
to_lowercase(s).chars().map(|c| {
if c.is_alphanumeric() {
c
} else {
'_'
}
}).collect()
}
fn to_lowercase(s: &str) -> String {
use std::ascii::AsciiExt;
s.to_ascii_lowercase()
}
fn parse_code_block_info(info: &str) -> CodeBlockInfo {
let tokens = info.split(|c: char| {
!(c == '_' || c == '-' || c.is_alphanumeric())
});
let mut seen_rust_tags = false;
let mut seen_other_tags = false;
let mut info = CodeBlockInfo {
is_rust: false,
should_panic: false,
ignore: false,
is_template: false
};
for token in tokens {
match token {
"" => {}
"rust" => { info.is_rust = true; seen_rust_tags = true }
"should_panic" => { info.should_panic = true; seen_rust_tags = true }
"ignore" => { info.ignore = true; seen_rust_tags = true }
"skeptic-template" => { info.is_template = true; seen_rust_tags = true }
_ => { seen_other_tags = true }
}
}
info.is_rust &= !seen_other_tags || seen_rust_tags;
info
}
struct CodeBlockInfo {
is_rust: bool,
should_panic: bool,
ignore: bool,
is_template: bool
}
fn emit_tests(config: &Config, suite: DocTestSuite) -> Result<(), IoError> {
let mut file = try!(File::create(&config.out_file));
try!(writeln!(file, "extern crate skeptic;\n"));
for doc_test in suite.doc_tests {
for test in &doc_test.tests {
let test_string = try!(create_test_string(config, &doc_test.template, test));
try!(writeln!(file, "{}", test_string));
}
}
Ok(())
}
fn create_test_string(config: &Config,
template: &Option<String>,
test: &Test) -> Result<String, IoError> {
let template = template.clone().unwrap_or_else(|| String::from("{}"));
let test_text = test.text.iter().fold(String::new(), |a, b| format!("{}{}", a, b));
let mut s: Vec<u8> = Vec::new();
if test.ignore {
try!(writeln!(s, "#[ignore]"));
}
if test.should_panic {
try!(writeln!(s, "#[should_panic]"));
}
try!(writeln!(s, "#[test] fn {}() {{", test.name));
try!(writeln!(s, " let ref s = format!(\"{}\", r#\"{}\"#);", template, test_text));
try!(writeln!(s, " skeptic::rt::run_test(r#\"{}\"#, s);", config.out_dir.to_str().unwrap()));
try!(writeln!(s, "}}"));
try!(writeln!(s, ""));
Ok(String::from_utf8(s).unwrap())
}
pub mod rt {
use std::env;
use std::fs::File;
use std::io::{self, Write};
use std::path::{Path, PathBuf};
use std::process::{Command, Output};
use tempdir::TempDir;
pub fn run_test(out_dir: &str, test_text: &str) {
let ref rustc = env::var("RUSTC").unwrap_or(String::from("rustc"));
let ref outdir = TempDir::new("rust-skeptic").unwrap();
let ref testcase_path = outdir.path().join("test.rs");
let ref binary_path = outdir.path().join("out.exe");
write_test_case(testcase_path, test_text);
compile_test_case(testcase_path, binary_path, rustc, out_dir);
run_test_case(binary_path);
}
fn write_test_case(path: &Path, test_text: &str) {
let mut file = File::create(path).unwrap();
file.write_all(test_text.as_bytes()).unwrap();
}
fn compile_test_case(in_path: &Path, out_path: &Path,
rustc: &str, out_dir: &str) {
let mut target_dir = PathBuf::from(out_dir);
target_dir.pop();
target_dir.pop();
target_dir.pop();
let mut deps_dir = target_dir.clone();
deps_dir.push("deps");
interpret_output(
Command::new(rustc)
.arg(in_path)
.arg("-o").arg(out_path)
.arg("--crate-type=bin")
.arg("-L").arg(target_dir)
.arg("-L").arg(deps_dir)
.output()
.unwrap());
}
fn run_test_case(out_path: &Path) {
interpret_output(
Command::new(out_path)
.output()
.unwrap());
}
fn interpret_output(output: Output) {
write!(io::stdout(), "{}", String::from_utf8(output.stdout).unwrap()).unwrap();
write!(io::stderr(), "{}", String::from_utf8(output.stderr).unwrap()).unwrap();
if !output.status.success() {
panic!("command failed");
}
}
}