private int putPattern(String name, Pattern p) {
int start = _buf.position();
_put(REGEX, name);
_put(p.pattern());
_put(patternFlags(p.flags()));
return _buf.position() - start;
}
public static void main(String[] args) throws IOException {
Path path = Paths.get("../alice.txt");
String contents = new String(Files.readAllBytes(path), StandardCharsets.UTF_8);
Stream<String> words = Stream.of(contents.split("[\\P{L}]+"));
show("words", words);
Stream<String> song = Stream.of("gently", "down", "the", "stream");
show("song", song);
Stream<String> silence = Stream.empty();
silence = Stream.<String>empty(); // Explicit type specification
show("silence", silence);
Stream<String> echos = Stream.generate(() -> "Echo");
show("echos", echos);
Stream<Double> randoms = Stream.generate(Math::random);
show("randoms", randoms);
Stream<BigInteger> integers = Stream.iterate(BigInteger.ONE, n -> n.add(BigInteger.ONE));
show("integers", integers);
Stream<String> wordsAnotherWay = Pattern.compile("[\\P{L}]+").splitAsStream(contents);
show("wordsAnotherWay", wordsAnotherWay);
try (Stream<String> lines = Files.lines(path, StandardCharsets.UTF_8)) {
show("lines", lines);
}
}
/**
* Get dependencies of a source file.
*
* @param path The canonical path of source file.
* @return Path of dependencies.
*/
private ArrayList<String> getDependencies(String path) {
if (!dependenceMap.containsKey(path)) {
ArrayList<String> dependencies = new ArrayList<String>();
Matcher m = PATTERN_REQUIRE.matcher(read(path, charset));
while (m.find()) {
// Decide which root path to use.
// Path wrapped in <> is related to root path.
// Path wrapped in "" is related to parent folder of the source file.
String root = null;
if (m.group(1).equals("<")) {
root = this.root;
} else {
root = new File(path).getParent();
}
// Get path of required file.
String required = m.group(2);
File f = new File(root, required);
if (f.exists()) {
dependencies.add(canonize(f));
} else {
App.exit("Cannot find required file " + required + " in " + path);
}
}
dependenceMap.put(path, dependencies);
}
return dependenceMap.get(path);
}
/**
* Create a new SourceFile instance with specified rootPath, file encoding and file type.
*
* @param root Root path specified from command line.
* @param charset Text encoding of source file.
*/
public SourceFile(String root, String charset) {
// Initiation.
binaryCache = new HashMap<String, byte[]>();
dependenceMap = new HashMap<String, ArrayList<String>>();
// Match "// #require <path>" or "// #require "path"" or "/* #require <path> */" or "/* #require
// "path" */".
PATTERN_REQUIRE =
Pattern.compile(
"^/[/\\*]\\s#require\\s([\"<])([\\w\\-\\./]+)[\">](?:\\s\\*/)?$", Pattern.MULTILINE);
locateRoot(root);
this.charset = charset;
}
private void putPattern(String name, Pattern p) {
_put(REGEX, name);
_put(p.pattern());
_put(regexFlags(p.flags()));
}
