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/**
* Module to work with trivia tokens (`comment`, `whitespace`,
* `specialTokenSequence`) which are attached to tokens near them when source
* code gets tokenized.
*/
module dparse.trivia;
import std.algorithm;
import std.array;
import std.range;
import std.string;
import std.traits;
import dparse.lexer;
enum CommentType : ubyte
{
none,
docLine,
docBlock,
normalLine,
normalBlock,
}
CommentType determineCommentType(string comment) pure nothrow @safe
{
auto bytes = comment.representation;
auto index = bytes.startsWith(
"//".representation,
"/+".representation,
"/*".representation
);
bool isDoc = bytes.length >= 3 && bytes[1] == bytes[2];
switch (index)
{
case 1:
// Don't treat "////////...." comments as doc comments
isDoc = isDoc && (bytes.length == 3 || bytes[3..$].any!(c => c != '/'));
return isDoc ? CommentType.docLine : CommentType.normalLine;
case 2:
case 3:
return isDoc ? CommentType.docBlock : CommentType.normalBlock;
default:
return CommentType.none;
}
}
///
unittest
{
assert (determineCommentType("/// hello") == CommentType.docLine);
assert (determineCommentType("/++ hello") == CommentType.docBlock);
assert (determineCommentType("/** hello") == CommentType.docBlock);
assert (determineCommentType("// hello") == CommentType.normalLine);
assert (determineCommentType("/+ hello") == CommentType.normalBlock);
assert (determineCommentType("/* hello") == CommentType.normalBlock);
assert (determineCommentType("/ hello") == CommentType.none);
assert (determineCommentType("/") == CommentType.none);
assert (determineCommentType("////////////////////") == CommentType.normalLine);
assert (determineCommentType("///") == CommentType.docLine);
assert (determineCommentType("/// ") == CommentType.docLine);
}
bool isDocComment(CommentType type) @safe nothrow pure
{
return type == CommentType.docLine || type == CommentType.docBlock;
}
/**
* Removes "decoration" such as leading whitespace, leading + and * characters,
* and places the result into the given output range
*/
public void unDecorateComment(T)(string comment, auto ref T outputRange)
if (isOutputRange!(T, string))
in
{
assert (comment.length >= 3);
}
do
{
import std.string : chompPrefix, KeepTerminator, lineSplitter, stripRight;
string leadingChars;
enum LineType { none, normal, strange }
LineType prevLineType;
switch (comment[0 .. 3])
{
case "///":
foreach (line; lineSplitter!(KeepTerminator.yes)(comment))
{
if (leadingChars.empty)
{
size_t k = 3;
while (k < line.length && (line[k] == ' ' || line[k] == '\t'))
k++;
leadingChars = line[0 .. k];
}
outputRange.put(line.chompPrefix(leadingChars));
}
break;
case "/++":
case "/**":
alias CL = MultiLineCommentHelper!(ElementEncodingType!(typeof(comment)));
CL cl = CL(comment);
cl.process(outputRange);
break;
default:
outputRange.put(comment);
}
}
///
unittest
{
import std.array:array, appender;
import std.stdio:stderr;
stderr.writeln("Running unittest for unDecorateComment...");
string[] inputs = [
"/***************\n*******************/",
"/***************\n *\n ******************/",
"/**\n*/",
"/** */",
"/***/",
"/******/",
"/** abcde1 */",
"/// abcde2\n/// abcde2",
"/**\n * stuff1\n */",
"/**\n *\n * stuff2\n */",
"/**\n *\n * stuff3\n *\n */",
"/**\n *\n * stuff4\n *\n*/",
"/**\n * abcde3\n * abcde3 \n */",
"/**\n * abcde4\n *\n * abcde4\n */",
"/**abcde5\n*abcde5\n*/",
"/** abcde6\n * abcde6\n*/",
"/**\n1\n\n\n\n*/",
"/**\r\n1\r\n\r\n\r\n\r\n*/",
"/**\na1\n\na2\n\n*/",
"/**b1\n*b2\n*b3*/",
"/**c1\n *c2\n *c3*/",
"/**d1\n *d2\n *d3\n*/",
"///a\fbc\n///def"
];
string[] outputs = [
"",
"",
"",
"",
"",
"",
"abcde1",
"abcde2\nabcde2",
"stuff1",
"stuff2",
"stuff3",
"stuff4",
"abcde3\n abcde3",
"abcde4\n\nabcde4",
"abcde5\nabcde5",
"abcde6\nabcde6",
"1",
"1",
"a1\n\na2",
"b1\nb2\nb3",
"c1\nc2\nc3",
"d1\nd2\nd3",
"a\fbc\ndef"
];
// tests where * and + are not interchangeable
string[2][] np =
[
["/**\n * d1\n d2\n */", "* d1\nd2"],
["/**\n + d1\n d2\n */", "+ d1\nd2"],
["/**d1\n\n\n*d2\n*/", "d1\n\n*d2"],
];
assert(inputs.length == outputs.length);
foreach (pair; zip(inputs, outputs))
{
foreach (b; [true, false])
{
auto app = appender!string();
unDecorateComment(b ? pair[0] : pair[0].replace("*", "+"), app);
assert(pair[1] == app.data, "[[" ~ pair[0] ~ "]] => [[" ~ app.data ~ "]]");
}
}
foreach (pair; np)
{
auto app = appender!string();
unDecorateComment(pair[0], app);
assert(pair[1] == app.data, "[[" ~ pair[0] ~ "]] => [[" ~ app.data ~ "]]");
}
stderr.writeln("Unittest for unDecorateComment passed.");
}
/** Gives a line per line view on DDOC comments of type `/++` and `/**` which
* makes easier to remove the decoration and in an almost 100% nogc way. */
private struct MultiLineCommentHelper(CharType : const(char))
{
// this struct is more used as a 'function with nested functions' would.
this() @disable;
this(this) @disable;
auto opAssign(T)(T t) @disable;
private:
char[][] lines;
// either lines.length or lines.length-1, depending on if last line only closes
size_t lastLineInBlockPlusOne;
// either '*' or '+'
const(char) commentChar;
// either 0 or 1, depending on if first line only opens
ubyte firstLineInBlock;
import std.ascii : isWhite;
void stripIndent() @safe @nogc pure nothrow
{
if (lines.length < 2)
return;
size_t count;
foreach (const j; 0 .. lines[1].length)
if (!(lines[1][j]).isWhite)
{
count = j;
break;
}
if (count < 2)
return;
foreach (ref line; lines[1 .. $])
{
foreach (const j; 0 .. line.length)
{
if (!(line[j]).isWhite)
break;
if (j == count - 1)
{
line = line[j .. $];
break;
}
}
}
}
void processFirstLine() @safe @nogc pure nothrow
{
assert(lines.length);
if (lines[0].length > 3)
{
foreach (const i; 1..lines[0].length)
{
if (lines[0][i] == commentChar)
{
if (i < lines[0].length - 2)
continue;
if (i == lines[0].length - 2 && lines[0][i+1] == '/')
{
lines[0][] = ' ';
break;
}
if (i == lines[0].length - 1)
{
lines[0][] = ' ';
break;
}
}
else
{
lines[0][0..i] = ' ';
break;
}
}
}
lines[0][0..3] = " ";
if (lines.length == 1 &&
lines[0][$-2] == commentChar && lines[0][$-1] == '/')
{
lines[0][$-2..$] = " ";
}
foreach (const i; 0..lines[0].length)
if (!(lines[0][i].isWhite))
return;
firstLineInBlock = 1;
}
void processLastLine() @safe @nogc pure nothrow
{
lastLineInBlockPlusOne = lines.length;
if (lines.length == 1)
return;
size_t closeStartIndex = size_t.max;
foreach (const i; 0..lines[$-1].length)
{
if (lines[$-1][i] == commentChar)
{
if (closeStartIndex == size_t.max)
closeStartIndex = i;
if (i == lines[$-1].length - 2)
{
// see the FIXME note in unDecorate()
lastLineInBlockPlusOne = closeStartIndex == 0 ? lines.length-1 : lines.length;
lines[$-1][closeStartIndex..$] = ' ';
break;
}
}
else
{
closeStartIndex = size_t.max;
lastLineInBlockPlusOne = lines.length;
}
}
}
void unDecorate() @safe @nogc pure nothrow
{
if (lines.length == 1 || lines.length == 2 && lines[$-1].length == 0)
return;
bool allDecorated;
static immutable char[2][2] pattern = [[' ', '*'],[' ', '+']];
const ubyte patternIndex = commentChar == '+';
// first line is never decorated
const size_t lo = 1;
// although very uncommon, the last line can be decorated e.g in `* lastline */`:
// the first '*' is a deco if all prev lines are also decorated.
// FIXME: `hi` should be set to `lastLineInBlockPlusOne`...
const size_t hi = (lines[$-1].length > 1 &&
(lines[$-1][0] == commentChar || lines[$-1][0..2] == pattern[patternIndex]))
? lines.length : lines.length-1;
// deco with a leading white
foreach (const i; lo .. hi)
{
if (lines[i].length < 2)
break;
else if (lines[i][0..2] != pattern[patternIndex])
break;
else if (i == hi-1)
allDecorated = true;
}
// deco w/o leading white
if (!allDecorated)
foreach (const i; lo .. hi)
{
if (lines[i].length == 0)
break;
if (lines[i][0] != commentChar)
break;
else if (i == hi-1)
allDecorated = true;
}
if (!allDecorated)
return;
const size_t indexToChange = (lines[lo][0] == commentChar) ? 0 : 1;
foreach (ref line; lines[lo .. hi])
line[indexToChange] = ' ';
}
void stripLeft() @safe @nogc pure nothrow
{
foreach (const i; 0 .. lines[0].length)
if (!(lines[0][i]).isWhite)
{
lines[0] = lines[0][i..$];
break;
}
if (lines.length == 1)
return;
while (true)
{
bool processColumn;
foreach (ref line; lines[1 .. lastLineInBlockPlusOne])
{
if (line.length == 0)
continue;
if (!(line[0]).isWhite)
return;
processColumn = true;
}
if (!processColumn)
return;
foreach (ref line; lines[1 .. lastLineInBlockPlusOne])
{
if (line.length == 0)
continue;
line = line[1..$];
}
}
}
void stripRight() @safe @nogc pure nothrow
{
foreach (ref line; lines[0 .. lines.length])
{
if (line.length == 0)
continue;
if ((line[$-1]).isWhite)
{
size_t firstWhite = line.length;
while (firstWhite > 0 && (line[firstWhite-1]).isWhite)
firstWhite--;
line = line[0..firstWhite];
}
}
}
void run() @safe @nogc pure nothrow
{
stripIndent();
processFirstLine();
processLastLine();
unDecorate();
stripLeft();
stripRight();
}
public:
this(CharType[] text) @safe pure nothrow
{
assert(text.length >= 3 && text[0] == '/',
"MultiLineCommentHelper text must start with a comment in form /++ or /**");
commentChar = text[1];
size_t startIndex, i;
Appender!(char[][]) linesApp;
linesApp.reserve(512);
void storeLine(size_t endIndexPlusOne)
{
static if (isMutable!CharType)
linesApp ~= text[startIndex..endIndexPlusOne];
else
linesApp ~= text[startIndex..endIndexPlusOne].dup;
}
// if we go over text length (in \r\n) we already stored the line, so just exit there
while (i < text.length)
{
// check if next char is going to be end of text, store until then & break
if (i + 1 == text.length)
{
storeLine(text.length);
break;
}
if (text[i] == '\n')
{
storeLine(i);
startIndex = i + 1;
}
else if (i + 1 < text.length && text[i .. i+2] == "\r\n")
{
storeLine(i);
i++;
startIndex = i + 1;
}
i++;
}
lines = linesApp.data;
}
void process(T)(ref T outbuffer)
{
run();
outbuffer.reserve(lines.length * 90);
bool prevWritten, empties;
foreach (ref line; lines[firstLineInBlock .. lines.length])
{
if (line.length != 0)
{
// close preceeding line
if (prevWritten)
outbuffer ~= "\n";
// insert new empty line
if (prevWritten && empties)
outbuffer ~= "\n";
outbuffer ~= line;
prevWritten = true;
empties = false;
}
else empties = true;
}
}
}
unittest
{
import std.conv : to;
alias SC = MultiLineCommentHelper!(immutable(char));
// checks full comment processing on the given string and compares the generated lines
void check(string comment, string[] lines, size_t lineNo = __LINE__)
{
auto sc = SC(comment);
sc.run();
assert(sc.lines == lines, sc.lines.to!string ~ " != " ~ lines.to!string
~ " (for check on line " ~ lineNo.to!string ~ ")");
}
// check common cases while typing
check("/++", [""]);
check("/++\r", [""]);
check("/++\n", [""]);
check("/++\r\n", [""]);
check("/++\r\n+", ["", "+"]);
check("/++\r\n+ ok", ["", "ok"]);
check("/++\r\n+ ok\r\n+/", ["", "ok", ""]);
check("/++/", [""]);
}
/// Extracts and combines ddoc comments from trivia comments.
string extractDdocFromTrivia(Tokens)(Tokens tokens) pure nothrow @safe
if (isInputRange!Tokens && is(ElementType!Tokens : Token))
{
bool hasDoc;
auto ret = appender!string;
foreach (trivia; tokens)
{
if (trivia.type == tok!"comment"
&& trivia.text.determineCommentType.isDocComment)
{
hasDoc = true;
if (!ret.data.empty)
ret.put('\n');
unDecorateComment(trivia.text, ret);
}
}
if (ret.data.length)
return ret.data;
else
return hasDoc ? "" : null;
}
unittest
{
Token[] tokens = [
Token(cast(ubyte) tok!"whitespace", "\n\n", 0, 0, 0),
Token(cast(ubyte) tok!"comment", "///", 0, 0, 0),
Token(cast(ubyte) tok!"whitespace", "\n", 0, 0, 0)
];
// Empty comment is non-null
auto comment = extractDdocFromTrivia(tokens);
assert(comment !is null);
assert(comment == "");
// Missing comment is null
comment = extractDdocFromTrivia(tokens[0 .. 1]);
assert(comment is null);
assert(comment == "");
}
string extractLeadingDdoc(const Token token) pure nothrow @safe
{
return extractDdocFromTrivia(token.leadingTrivia);
}
string extractTrailingDdoc(const Token token) pure nothrow @safe
{
return extractDdocFromTrivia(token.trailingTrivia.filter!(a => a.line == token.line));
}
// test token trivia members
unittest
{
import std.conv : to;
import std.exception : enforce;
static immutable src = `/// this is a module.
// mixed
/// it can do stuff
module foo.bar;
// hello
/**
* some doc
* hello
*/
int x; /// very nice
// TODO: do stuff
void main() {
#line 40
/// could be better
writeln(":)");
}
///
unittest {}
/// end of file`;
LexerConfig cf;
StringCache ca = StringCache(16);
const tokens = getTokensForParser(src, cf, &ca);
assert(tokens.length == 22);
assert(tokens[0].type == tok!"module");
assert(tokens[0].leadingTrivia.length == 6);
assert(tokens[0].leadingTrivia[0].type == tok!"comment");
assert(tokens[0].leadingTrivia[0].text == "/// this is a module.");
assert(tokens[0].leadingTrivia[1].type == tok!"whitespace");
assert(tokens[0].leadingTrivia[1].text == "\n");
assert(tokens[0].leadingTrivia[2].type == tok!"comment");
assert(tokens[0].leadingTrivia[2].text == "// mixed");
assert(tokens[0].leadingTrivia[3].type == tok!"whitespace");
assert(tokens[0].leadingTrivia[3].text == "\n");
assert(tokens[0].leadingTrivia[4].type == tok!"comment");
assert(tokens[0].leadingTrivia[4].text == "/// it can do stuff");
assert(tokens[0].leadingTrivia[5].type == tok!"whitespace");
assert(tokens[0].leadingTrivia[5].text == "\n");
assert(tokens[0].trailingTrivia.length == 1);
assert(tokens[0].trailingTrivia[0].type == tok!"whitespace");
assert(tokens[0].trailingTrivia[0].text == " ");
assert(tokens[1].type == tok!"identifier");
assert(tokens[1].text == "foo");
assert(!tokens[1].leadingTrivia.length);
assert(!tokens[1].trailingTrivia.length);
assert(tokens[2].type == tok!".");
assert(!tokens[2].leadingTrivia.length);
assert(!tokens[2].trailingTrivia.length);
assert(tokens[3].type == tok!"identifier");
assert(tokens[3].text == "bar");
assert(!tokens[3].leadingTrivia.length);
assert(!tokens[3].trailingTrivia.length);
assert(tokens[4].type == tok!";");
assert(!tokens[4].leadingTrivia.length);
assert(tokens[4].trailingTrivia.length == 1);
assert(tokens[4].trailingTrivia[0].type == tok!"whitespace");
assert(tokens[4].trailingTrivia[0].text == "\n\n");
assert(tokens[5].type == tok!"int");
assert(tokens[5].leadingTrivia.length == 4);
assert(tokens[5].leadingTrivia[0].text == "// hello");
assert(tokens[5].leadingTrivia[1].text == "\n\n");
assert(tokens[5].leadingTrivia[2].text == "/**\n * some doc\n * hello\n */");
assert(tokens[5].leadingTrivia[3].text == "\n");
assert(tokens[5].trailingTrivia.length == 1);
assert(tokens[5].trailingTrivia[0].text == " ");
assert(tokens[6].type == tok!"identifier");
assert(tokens[6].text == "x");
assert(!tokens[6].leadingTrivia.length);
assert(!tokens[6].trailingTrivia.length);
assert(tokens[7].type == tok!";");
assert(!tokens[7].leadingTrivia.length);
assert(tokens[7].trailingTrivia.length == 3);
assert(tokens[7].trailingTrivia[0].text == " ");
assert(tokens[7].trailingTrivia[1].text == "/// very nice");
assert(tokens[7].trailingTrivia[2].text == "\n\n");
assert(tokens[8].type == tok!"void");
assert(tokens[8].leadingTrivia.length == 2);
assert(tokens[8].leadingTrivia[0].text == "// TODO: do stuff");
assert(tokens[8].leadingTrivia[1].text == "\n");
assert(tokens[8].trailingTrivia.length == 1);
assert(tokens[8].trailingTrivia[0].text == " ");
assert(tokens[9].type == tok!"identifier");
assert(tokens[9].text == "main");
assert(!tokens[9].leadingTrivia.length);
assert(!tokens[9].trailingTrivia.length);
assert(tokens[10].type == tok!"(");
assert(!tokens[10].leadingTrivia.length);
assert(!tokens[10].trailingTrivia.length);
assert(tokens[11].type == tok!")");
assert(!tokens[11].leadingTrivia.length);
assert(tokens[11].trailingTrivia.length == 1);
assert(tokens[11].trailingTrivia[0].text == " ");
assert(tokens[12].type == tok!"{");
assert(!tokens[12].leadingTrivia.length);
assert(tokens[12].trailingTrivia.length == 1);
assert(tokens[12].trailingTrivia[0].text == "\n ");
assert(tokens[13].type == tok!"identifier");
assert(tokens[13].text == "writeln");
assert(tokens[13].leadingTrivia.length == 4);
assert(tokens[13].leadingTrivia[0].type == tok!"specialTokenSequence");
assert(tokens[13].leadingTrivia[0].text == "#line 40");
assert(tokens[13].leadingTrivia[1].type == tok!"whitespace");
assert(tokens[13].leadingTrivia[1].text == "\n ");
assert(tokens[13].leadingTrivia[2].type == tok!"comment");
assert(tokens[13].leadingTrivia[2].text == "/// could be better");
assert(tokens[13].leadingTrivia[3].type == tok!"whitespace");
assert(tokens[13].leadingTrivia[3].text == "\n ");
assert(!tokens[13].trailingTrivia.length);
assert(tokens[14].type == tok!"(");
assert(!tokens[14].leadingTrivia.length);
assert(!tokens[14].trailingTrivia.length);
assert(tokens[15].type == tok!"stringLiteral");
assert(!tokens[15].leadingTrivia.length);
assert(!tokens[15].trailingTrivia.length);
assert(tokens[16].type == tok!")");
assert(!tokens[16].leadingTrivia.length);
assert(!tokens[16].trailingTrivia.length);
assert(tokens[17].type == tok!";");
assert(!tokens[17].leadingTrivia.length);
assert(tokens[17].trailingTrivia.length == 1);
assert(tokens[17].trailingTrivia[0].text == "\n");
assert(tokens[18].type == tok!"}");
assert(!tokens[18].leadingTrivia.length);
assert(tokens[18].trailingTrivia.length == 1);
assert(tokens[18].trailingTrivia[0].type == tok!"whitespace");
assert(tokens[18].trailingTrivia[0].text == "\n\n");
assert(tokens[19].type == tok!"unittest");
assert(tokens[19].leadingTrivia.length == 2);
assert(tokens[19].leadingTrivia[0].type == tok!"comment");
assert(tokens[19].leadingTrivia[0].text == "///");
assert(tokens[19].leadingTrivia[1].type == tok!"whitespace");
assert(tokens[19].leadingTrivia[1].text == "\n");
assert(tokens[19].trailingTrivia.length == 1);
assert(tokens[19].trailingTrivia[0].type == tok!"whitespace");
assert(tokens[19].trailingTrivia[0].text == " ");
assert(tokens[20].type == tok!"{");
assert(!tokens[20].leadingTrivia.length);
assert(!tokens[20].trailingTrivia.length);
assert(tokens[21].type == tok!"}");
assert(!tokens[21].leadingTrivia.length);
assert(tokens[21].trailingTrivia.length == 2);
assert(tokens[21].trailingTrivia[0].type == tok!"whitespace");
assert(tokens[21].trailingTrivia[0].text == "\n\n");
assert(tokens[21].trailingTrivia[1].type == tok!"comment");
assert(tokens[21].trailingTrivia[1].text == "/// end of file");
}