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module dparse.lexer;
import std.typecons;
import std.typetuple;
import std.array;
import std.algorithm;
import std.range;
import std.experimental.lexer;
import std.traits;
import core.cpuid : sse42;
public import dparse.trivia;
/// Operators
private enum operators = [
",", ".", "..", "...", "/", "/=", "!", "!<", "!<=", "!<>", "!<>=", "!=",
"!>", "!>=", "$", "%", "%=", "&", "&&", "&=", "(", ")", "*", "*=", "+", "++",
"+=", "-", "--", "-=", ":", ";", "<", "<<", "<<=", "<=", "<>", "<>=", "=",
"==", "=>", ">", ">=", ">>", ">>=", ">>>", ">>>=", "?", "@", "[", "]", "^",
"^=", "^^", "^^=", "{", "|", "|=", "||", "}", "~", "~="
];
/// Kewords
private enum keywords = [
"abstract", "alias", "align", "asm", "assert", "auto", "bool",
"break", "byte", "case", "cast", "catch", "cdouble", "cent", "cfloat",
"char", "class", "const", "continue", "creal", "dchar", "debug", "default",
"delegate", "delete", "deprecated", "do", "double", "else", "enum",
"export", "extern", "false", "final", "finally", "float", "for", "foreach",
"foreach_reverse", "function", "goto", "idouble", "if", "ifloat",
"immutable", "import", "in", "inout", "int", "interface", "invariant",
"ireal", "is", "lazy", "long", "macro", "mixin", "module", "new", "nothrow",
"null", "out", "override", "package", "pragma", "private", "protected",
"public", "pure", "real", "ref", "return", "scope", "shared", "short",
"static", "struct", "super", "switch", "synchronized", "template", "this",
"throw", "true", "try", "typedef", "typeid", "typeof", "ubyte", "ucent",
"uint", "ulong", "union", "unittest", "ushort", "version", "void",
"wchar", "while", "with", "__DATE__", "__EOF__", "__FILE__",
"__FILE_FULL_PATH__", "__FUNCTION__", "__gshared", "__LINE__", "__MODULE__",
"__parameters", "__PRETTY_FUNCTION__", "__TIME__", "__TIMESTAMP__", "__traits",
"__vector", "__VENDOR__", "__VERSION__"
];
/// Other tokens
private enum dynamicTokens = [
"specialTokenSequence", "comment", "identifier", "scriptLine",
"whitespace", "doubleLiteral", "floatLiteral", "idoubleLiteral",
"ifloatLiteral", "intLiteral", "longLiteral", "realLiteral",
"irealLiteral", "uintLiteral", "ulongLiteral", "characterLiteral",
"dstringLiteral", "stringLiteral", "wstringLiteral"
];
private enum pseudoTokenHandlers = [
"\"", "lexStringLiteral",
"`", "lexWysiwygString",
"//", "lexSlashSlashComment",
"/*", "lexSlashStarComment",
"/+", "lexSlashPlusComment",
".", "lexDot",
"'", "lexCharacterLiteral",
"0", "lexNumber",
"1", "lexDecimal",
"2", "lexDecimal",
"3", "lexDecimal",
"4", "lexDecimal",
"5", "lexDecimal",
"6", "lexDecimal",
"7", "lexDecimal",
"8", "lexDecimal",
"9", "lexDecimal",
"q\"", "lexDelimitedString",
"q{", "lexTokenString",
"r\"", "lexWysiwygString",
"x\"", "lexHexString",
" ", "lexWhitespace",
"\t", "lexWhitespace",
"\r", "lexWhitespace",
"\n", "lexWhitespace",
"\v", "lexWhitespace",
"\f", "lexWhitespace",
"\u2028", "lexLongNewline",
"\u2029", "lexLongNewline",
"#!", "lexScriptLine",
"#line", "lexSpecialTokenSequence"
];
/// Token ID type for the D lexer.
public alias IdType = TokenIdType!(operators, dynamicTokens, keywords);
/**
* Function used for converting an IdType to a string.
*
* Examples:
* ---
* IdType c = tok!"case";
* assert (str(c) == "case");
* ---
*/
public alias str = tokenStringRepresentation!(IdType, operators, dynamicTokens, keywords);
/**
* Template used to refer to D token types.
*
* See the $(B operators), $(B keywords), and $(B dynamicTokens) enums for
* values that can be passed to this template.
* Example:
* ---
* import dparse.lexer;
* IdType t = tok!"floatLiteral";
* ---
*/
public template tok(string token)
{
alias tok = TokenId!(IdType, operators, dynamicTokens, keywords, token);
}
mixin template TokenTriviaFields()
{
/**
* Whitespace and comment tokens attached to this token.
*
* All trivia tokens must have the text property set to the text with
* which they identify with. This means you can map all trivia tokens to
* their .text property and join them together to get the source code back
* without any loss of information.
*
* Trivia is only included when calling getTokensForParser. When iterating
* over DLexer all tokens will be in their raw form and none will be
* converted to trivia.
*
* Note: in the future you might need to explicitly pass
* WhitespaceBehavior.include (or keep the default) as getTokensForParser
* currently overrides it to include.
*
* Contains: `comment`, `whitespace`, `specialTokenSequence`
*/
immutable(typeof(this))[] leadingTrivia;
/// ditto
immutable(typeof(this))[] trailingTrivia;
string memoizedLeadingComment = null;
string memoizedTrailingComment = null;
/// Legacy property to get documentation comments, with comment border
/// stripped off, which is attached to this token.
string comment() const pure nothrow @safe @property {
import dparse.trivia : extractLeadingDdoc;
if (memoizedLeadingComment !is null)
return memoizedLeadingComment;
return (cast()memoizedLeadingComment) = this.extractLeadingDdoc;
}
/// ditto
string trailingComment() const pure nothrow @safe @property {
import dparse.trivia : extractTrailingDdoc;
if (memoizedTrailingComment !is null)
return memoizedTrailingComment;
return (cast()memoizedTrailingComment) = this.extractTrailingDdoc;
}
int opCmp(size_t i) const pure nothrow @safe @nogc {
if (index < i) return -1;
if (index > i) return 1;
return 0;
}
int opCmp(ref const typeof(this) other) const pure nothrow @safe @nogc {
return opCmp(other.index);
}
}
// mixin in from dparse.lexer to make error messages more managable size as the
// entire string is dumped when there is a type mismatch.
private enum extraFields = "import dparse.lexer:TokenTriviaFields; mixin TokenTriviaFields;";
/// The token type in the D lexer
public alias Token = std.experimental.lexer.TokenStructure!(IdType, extraFields);
/**
* Configure whitespace handling
*/
public enum WhitespaceBehavior : ubyte
{
include = 0b0000_0000,
skip = 0b0000_0001,
}
private enum stringBehaviorNotWorking = "Automatic string parsing is not "
~ "supported and was previously not working. To unescape strings use the "
~ "`dparse.strings : unescapeString` function on the token texts instead.";
/**
* Configure string lexing behavior
*/
// was enum, but struct now for deprecations and support with old compilers
public struct StringBehavior
{
/// Do not include quote characters, process escape sequences
deprecated(stringBehaviorNotWorking) static immutable StringBehavior compiler = StringBehavior(0b0000_0000);
/// Opening quotes, closing quotes, and string suffixes are included in
/// the string token
deprecated(stringBehaviorNotWorking) static immutable StringBehavior includeQuoteChars = StringBehavior(0b0000_0001);
/// String escape sequences are not replaced
deprecated(stringBehaviorNotWorking) static immutable StringBehavior notEscaped = StringBehavior(0b0000_0010);
/// Not modified at all. Useful for formatters or highlighters
static immutable StringBehavior source = StringBehavior(0b0000_0011);
ubyte behavior;
alias behavior this;
}
public enum CommentBehavior : bool
{
intern = true,
noIntern = false
}
/**
* Lexer configuration struct
*/
public struct LexerConfig
{
string fileName;
StringBehavior stringBehavior;
WhitespaceBehavior whitespaceBehavior;
CommentBehavior commentBehavior = CommentBehavior.intern;
}
/**
* Basic type token types.
*/
public alias BasicTypes = AliasSeq!(tok!"int", tok!"bool", tok!"byte",
tok!"cdouble", tok!"cent", tok!"cfloat", tok!"char", tok!"creal",
tok!"dchar", tok!"double", tok!"float", tok!"idouble",
tok!"ifloat", tok!"ireal", tok!"long", tok!"real", tok!"short",
tok!"ubyte", tok!"ucent", tok!"uint", tok!"ulong", tok!"ushort",
tok!"void", tok!"wchar");
/**
* Returns: true if the given ID is for a basic type.
*/
public bool isBasicType(IdType type) nothrow pure @safe @nogc
{
switch (type)
{
foreach (T; BasicTypes)
{
case T:
return true;
}
default:
return false;
}
}
/**
* Number literal token types.
*/
public alias NumberLiterals = AliasSeq!(tok!"doubleLiteral",
tok!"floatLiteral", tok!"idoubleLiteral", tok!"ifloatLiteral",
tok!"intLiteral", tok!"longLiteral", tok!"realLiteral",
tok!"irealLiteral", tok!"uintLiteral", tok!"ulongLiteral");
/**
* Returns: true if the given ID type is for a number literal.
*/
public bool isNumberLiteral(IdType type) nothrow pure @safe @nogc
{
switch (type)
{
foreach (T; NumberLiterals)
{
case T:
return true;
}
default:
return false;
}
}
/**
* Number literal token types.
*/
public alias IntegerLiterals = AliasSeq!(tok!"intLiteral", tok!"longLiteral",
tok!"uintLiteral", tok!"ulongLiteral");
/**
* Returns: true if the given ID type is for a integer literal.
*/
public bool isIntegerLiteral(IdType type) nothrow pure @safe @nogc
{
switch (type)
{
foreach (T; IntegerLiterals)
{
case T:
return true;
}
default:
return false;
}
}
/**
* Operator token types.
*/
public alias Operators = AliasSeq!(tok!",", tok!".", tok!"..", tok!"...",
tok!"/", tok!"/=", tok!"!", tok!"!<", tok!"!<=", tok!"!<>",
tok!"!<>=", tok!"!=", tok!"!>", tok!"!>=", tok!"$", tok!"%",
tok!"%=", tok!"&", tok!"&&", tok!"&=", tok!"(", tok!")",
tok!"*", tok!"*=", tok!"+", tok!"++", tok!"+=", tok!"-",
tok!"--", tok!"-=", tok!":", tok!";", tok!"<", tok!"<<",
tok!"<<=", tok!"<=", tok!"<>", tok!"<>=", tok!"=", tok!"==",
tok!"=>", tok!">", tok!">=", tok!">>", tok!">>=", tok!">>>",
tok!">>>=", tok!"?", tok!"@", tok!"[", tok!"]", tok!"^",
tok!"^=", tok!"^^", tok!"^^=", tok!"{", tok!"|", tok!"|=",
tok!"||", tok!"}", tok!"~", tok!"~=");
/**
* Returns: true if the given ID type is for an operator.
*/
public bool isOperator(IdType type) nothrow pure @safe @nogc
{
switch (type)
{
foreach (T; Operators)
{
case T:
return true;
}
default:
return false;
}
}
/**
* Keyword token types.
*/
public alias Keywords = AliasSeq!(tok!"abstract", tok!"alias", tok!"align",
tok!"asm", tok!"assert", tok!"auto", tok!"break",
tok!"case", tok!"cast", tok!"catch", tok!"class", tok!"const",
tok!"continue", tok!"debug", tok!"default", tok!"delegate",
tok!"delete", tok!"deprecated", tok!"do", tok!"else", tok!"enum",
tok!"export", tok!"extern", tok!"false", tok!"final", tok!"finally",
tok!"for", tok!"foreach", tok!"foreach_reverse", tok!"function",
tok!"goto", tok!"if", tok!"immutable", tok!"import", tok!"in",
tok!"inout", tok!"interface", tok!"invariant", tok!"is",
tok!"lazy", tok!"macro", tok!"mixin", tok!"module", tok!"new",
tok!"nothrow", tok!"null", tok!"out", tok!"override", tok!"package",
tok!"pragma", tok!"private", tok!"protected", tok!"public",
tok!"pure", tok!"ref", tok!"return", tok!"scope", tok!"shared",
tok!"static", tok!"struct", tok!"super", tok!"switch", tok!"synchronized",
tok!"template", tok!"this", tok!"throw", tok!"true", tok!"try",
tok!"typedef", tok!"typeid", tok!"typeof", tok!"union", tok!"unittest",
tok!"version", tok!"while", tok!"with", tok!"__DATE__",
tok!"__EOF__", tok!"__FILE__", tok!"__FILE_FULL_PATH__", tok!"__FUNCTION__",
tok!"__gshared", tok!"__LINE__", tok!"__MODULE__", tok!"__parameters",
tok!"__PRETTY_FUNCTION__", tok!"__TIME__", tok!"__TIMESTAMP__",
tok!"__traits", tok!"__vector", tok!"__VENDOR__", tok!"__VERSION__");
/**
* Returns: true if the given ID type is for a keyword.
*/
public bool isKeyword(IdType type) pure nothrow @safe @nogc
{
switch (type)
{
foreach (T; Keywords)
{
case T:
return true;
}
default:
return false;
}
}
/**
* String literal token types
*/
public alias StringLiterals = AliasSeq!(tok!"dstringLiteral",
tok!"stringLiteral", tok!"wstringLiteral");
/**
* Returns: true if the given ID type is for a string literal.
*/
public bool isStringLiteral(IdType type) pure nothrow @safe @nogc
{
switch (type)
{
foreach (T; StringLiterals)
{
case T:
return true;
}
default:
return false;
}
}
/**
* Protection token types.
*/
public alias Protections = AliasSeq!(tok!"export", tok!"package",
tok!"private", tok!"public", tok!"protected");
/**
* Returns: true if the given ID type is for a protection attribute.
*/
public bool isProtection(IdType type) pure nothrow @safe @nogc
{
switch (type)
{
foreach (T; Protections)
{
case T:
return true;
}
default:
return false;
}
}
public alias SpecialTokens = AliasSeq!(tok!"__DATE__", tok!"__TIME__",
tok!"__TIMESTAMP__", tok!"__VENDOR__", tok!"__VERSION__", tok!"__FILE__",
tok!"__FILE_FULL_PATH__", tok!"__LINE__", tok!"__MODULE__",
tok!"__FUNCTION__", tok!"__PRETTY_FUNCTION__");
public bool isSpecialToken(IdType type) pure nothrow @safe @nogc
{
switch (type)
{
foreach (T; SpecialTokens)
{
case T:
return true;
}
default:
return false;
}
}
public alias Literals = AliasSeq!(StringLiterals, NumberLiterals, tok!"characterLiteral",
SpecialTokens, tok!"true", tok!"false", tok!"null", tok!"$");
public bool isLiteral(IdType type) pure nothrow @safe @nogc
{
switch (type)
{
foreach (T; Literals)
{
case T:
return true;
}
default:
return false;
}
}
/**
* Returns: an array of tokens lexed from the given source code to the output
* range. All whitespace, comment and specialTokenSequence tokens (trivia) are
* attached to the token nearest to them.
*
* Trivia is put on the last token as `trailingTrivia` if it is on the same
* line as the trivia, otherwise it will be attached to the next token in the
* `leadingTrivia` until there is the EOF, where it will be attached as
* `trailingTrivia` again.
*/
const(Token)[] getTokensForParser(R)(R sourceCode, LexerConfig config, StringCache* cache)
if (is(Unqual!(ElementEncodingType!R) : ubyte) && isDynamicArray!R)
{
config.whitespaceBehavior = WhitespaceBehavior.include;
config.commentBehavior = CommentBehavior.noIntern;
auto leadingTriviaAppender = appender!(Token[])();
leadingTriviaAppender.reserve(128);
auto trailingTriviaAppender = appender!(Token[])();
trailingTriviaAppender.reserve(128);
auto output = appender!(typeof(return))();
auto lexer = DLexer(sourceCode, config, cache);
loop: while (!lexer.empty) switch (lexer.front.type)
{
case tok!"specialTokenSequence":
case tok!"whitespace":
case tok!"comment":
if (!output.data.empty && lexer.front.line == output.data[$ - 1].line)
trailingTriviaAppender.put(lexer.front);
else
leadingTriviaAppender.put(lexer.front);
lexer.popFront();
break;
case tok!"__EOF__":
break loop;
default:
Token t = lexer.front;
lexer.popFront();
if (!output.data.empty && !trailingTriviaAppender.data.empty)
(cast() output.data[$ - 1].trailingTrivia) = trailingTriviaAppender.data.idup;
t.leadingTrivia = leadingTriviaAppender.data.idup;
leadingTriviaAppender.clear();
trailingTriviaAppender.clear();
output.put(t);
break;
}
if (!output.data.empty)
{
trailingTriviaAppender.put(leadingTriviaAppender.data);
(cast() output.data[$ - 1].trailingTrivia) = trailingTriviaAppender.data.idup;
}
return output.data;
}
/**
* The D lexer struct.
*/
public struct DLexer
{
mixin Lexer!(Token, lexIdentifier, isSeparating, operators, dynamicTokens,
keywords, pseudoTokenHandlers);
///
@disable this();
/**
* Params:
* range = the bytes that compose the source code that will be lexed.
* config = the lexer configuration to use.
* cache = the string interning cache for de-duplicating identifiers and
* other token text.
* haveSSE42 = Parse streaming SIMD Extensions 4.2 in inline assembly
*/
this(R)(R range, const LexerConfig config, StringCache* cache,
bool haveSSE42 = sse42()) pure nothrow @safe
if (is(Unqual!(ElementEncodingType!R) : ubyte) && isDynamicArray!R)
{
this.haveSSE42 = haveSSE42;
auto r = (range.length >= 3 && range[0] == 0xef && range[1] == 0xbb && range[2] == 0xbf)
? range[3 .. $] : range;
static if (is(ElementEncodingType!R == immutable))
this.range = LexerRange(cast(const(ubyte)[]) r);
else
this.range = LexerRange(cast(const(ubyte)[]) r.idup);
this.config = config;
this.cache = cache;
popFront();
}
///
public void popFront()() pure nothrow @safe
{
do
_popFront();
while (config.whitespaceBehavior == WhitespaceBehavior.skip
&& _front.type == tok!"whitespace");
}
/**
* Lexer error/warning message.
*/
static struct Message
{
/// 1-based line number
size_t line;
/// 1-based byte offset
size_t column;
/// Text of the message
string message;
/// `true` for an error, `false` for a warning
bool isError;
}
/**
* Returns: An array of all of the warnings and errors generated so far
* during lexing. It may make sense to only check this when `empty`
* returns `true`.
*/
const(Message[]) messages() const @property
{
return _messages;
}
private pure nothrow @safe:
bool isWhitespace()
{
switch (range.bytes[range.index])
{
case ' ':
case '\r':
case '\n':
case '\t':
case '\v':
case '\f':
return true;
case 0xe2:
auto peek = range.peek(2);
return peek.length == 2
&& peek[0] == 0x80
&& (peek[1] == 0xa8 || peek[1] == 0xa9);
default:
return false;
}
}
void popFrontWhitespaceAware()
{
switch (range.bytes[range.index])
{
case '\r':
range.popFront();
if (!(range.index >= range.bytes.length) && range.bytes[range.index] == '\n')
{
range.popFront();
range.incrementLine();
}
else
range.incrementLine();
return;
case '\n':
range.popFront();
range.incrementLine();
return;
case 0xe2:
auto lookahead = range.peek(3);
if (lookahead.length == 3 && lookahead[1] == 0x80
&& (lookahead[2] == 0xa8 || lookahead[2] == 0xa9))
{
range.index+=3;
range.column+=3;
range.incrementLine();
return;
}
else
{
range.popFront();
return;
}
default:
range.popFront();
return;
}
}
void lexWhitespace(ref Token token) @trusted
{
mixin (tokenStart);
loop: do
{
version (X86_64)
{
if (haveSSE42 && range.index + 16 < range.bytes.length)
{
skip!(true, '\t', ' ', '\v', '\f')(range.bytes.ptr + range.index,
&range.index, &range.column);
}
}
switch (range.bytes[range.index])
{
case '\r':
range.popFront();
if (!(range.index >= range.bytes.length) && range.bytes[range.index] == '\n')
{
range.popFront();
}
range.column = 1;
range.line += 1;
break;
case '\n':
range.popFront();
range.column = 1;
range.line += 1;
break;
case ' ':
case '\t':
case '\v':
case '\f':
range.popFront();
break;
case 0xe2:
if (range.index + 2 >= range.bytes.length)
break loop;
if (range.bytes[range.index + 1] != 0x80)
break loop;
if (range.bytes[range.index + 2] == 0xa8 || range.bytes[range.index + 2] == 0xa9)
{
range.index += 3;
range.column += 3;
range.column = 1;
range.line += 1;
break;
}
break loop;
default:
break loop;
}
} while (!(range.index >= range.bytes.length));
string text = config.whitespaceBehavior == WhitespaceBehavior.include
? cache.intern(range.slice(mark)) : "";
token = Token(tok!"whitespace", text, line, column, index);
}
void lexNumber(ref Token token)
{
mixin (tokenStart);
if (range.bytes[range.index] == '0' && range.index + 1 < range.bytes.length)
{
immutable ahead = range.bytes[range.index + 1];
switch (ahead)
{
case 'x':
case 'X':
range.index += 2;
range.column += 2;
lexHex(token, mark, line, column, index);
return;
case 'b':
case 'B':
range.index += 2;
range.column += 2;
lexBinary(token, mark, line, column, index);
return;
default:
lexDecimal(token, mark, line, column, index);
return;
}
}
else
lexDecimal(token, mark, line, column, index);
}
void lexHex(ref Token token)
{
mixin (tokenStart);
lexHex(token, mark, line, column, index);
}
void lexHex(ref Token token, size_t mark, size_t line, size_t column,
size_t index) @trusted
{
IdType type = tok!"intLiteral";
bool foundDot;
hexLoop: while (!(range.index >= range.bytes.length))
{
switch (range.bytes[range.index])
{
case 'a': .. case 'f':
case 'A': .. case 'F':
case '0': .. case '9':
case '_':
version (X86_64)
{
if (haveSSE42 && range.index + 16 < range.bytes.length)
{
immutable ulong i = rangeMatch!(false, '0', '9', 'a', 'f', 'A', 'F', '_', '_')
(range.bytes.ptr + range.index);
range.column += i;
range.index += i;
}
else
range.popFront();
}
else
range.popFront();
break;
case 'u':
case 'U':
lexIntSuffix(type);
break hexLoop;
case 'i':
if (foundDot)
lexFloatSuffix(type);
break hexLoop;
case 'L':
if (foundDot)
lexFloatSuffix(type);
else
lexIntSuffix(type);
break hexLoop;
case 'p':
case 'P':
lexExponent(type);
break hexLoop;
case '.':
if (foundDot || !(range.index + 1 < range.bytes.length) || range.peekAt(1) == '.')
break hexLoop;
else
{
// The following bit of silliness tries to tell the
// difference between "int dot identifier" and
// "double identifier".
if (range.index + 1 < range.bytes.length)
{
switch (range.peekAt(1))
{
case '0': .. case '9':
case 'A': .. case 'F':
case 'a': .. case 'f':
goto doubleLiteral;
default:
break hexLoop;
}
}
else
{
doubleLiteral:
range.popFront();
foundDot = true;
type = tok!"doubleLiteral";
}
}
break;
default:
break hexLoop;
}
}
token = Token(type, cache.intern(range.slice(mark)), line, column,
index);
}
void lexBinary(ref Token token)
{
mixin (tokenStart);
return lexBinary(token, mark, line, column, index);
}
void lexBinary(ref Token token, size_t mark, size_t line, size_t column,
size_t index) @trusted
{
IdType type = tok!"intLiteral";
binaryLoop: while (!(range.index >= range.bytes.length))
{
switch (range.bytes[range.index])
{
case '0':
case '1':
case '_':
version (X86_64)
{
if (haveSSE42 && range.index + 16 < range.bytes.length)
{
immutable ulong i = rangeMatch!(false, '0', '1', '_', '_')(
range.bytes.ptr + range.index);
range.column += i;
range.index += i;
}
else
range.popFront();
}
else
range.popFront();
break;
case 'u':
case 'U':
case 'L':
lexIntSuffix(type);
break binaryLoop;
default:
break binaryLoop;
}
}
token = Token(type, cache.intern(range.slice(mark)), line, column,
index);
}
void lexDecimal(ref Token token)
{
mixin (tokenStart);
lexDecimal(token, mark, line, column, index);
}
void lexDecimal(ref Token token, size_t mark, size_t line, size_t column,
size_t index) @trusted
{
bool foundDot = range.bytes[range.index] == '.';
IdType type = tok!"intLiteral";
if (foundDot)
{
range.popFront();
type = tok!"doubleLiteral";
}
decimalLoop: while (!(range.index >= range.bytes.length))
{
switch (range.bytes[range.index])
{
case '0': .. case '9':
case '_':
version (X86_64)
{
if (haveSSE42 && range.index + 16 < range.bytes.length)
{
immutable ulong i = rangeMatch!(false, '0', '9', '_', '_')(range.bytes.ptr + range.index);
range.column += i;
range.index += i;
}
else
range.popFront();
}
else
range.popFront();
break;
case 'u':
case 'U':
if (!foundDot)
lexIntSuffix(type);
break decimalLoop;
case 'i':
lexFloatSuffix(type);
break decimalLoop;
case 'L':
if (foundDot)
lexFloatSuffix(type);
else
lexIntSuffix(type);
break decimalLoop;
case 'f':
case 'F':
lexFloatSuffix(type);
break decimalLoop;
case 'e':
case 'E':
lexExponent(type);
break decimalLoop;
case '.':
if (foundDot || !(range.index + 1 < range.bytes.length) || range.peekAt(1) == '.')
break decimalLoop;
else
{
// The following bit of silliness tries to tell the
// difference between "int dot identifier" and
// "double identifier".
if (range.index + 1 < range.bytes.length)
{
immutable ch = range.peekAt(1);
if (ch <= 0x2f
|| (ch >= '0' && ch <= '9')
|| (ch >= ':' && ch <= '@')
|| (ch >= '[' && ch <= '^')
|| (ch >= '{' && ch <= '~')
|| ch == '`' || ch == '_')
{
goto doubleLiteral;
}
else
break decimalLoop;
}
else
{
doubleLiteral:
range.popFront();
foundDot = true;
type = tok!"doubleLiteral";
}
}
break;
default:
break decimalLoop;
}
}
token = Token(type, cache.intern(range.slice(mark)), line, column,
index);
}
void lexIntSuffix(ref IdType type) pure nothrow @safe
{
bool secondPass;
if (range.bytes[range.index] == 'u' || range.bytes[range.index] == 'U')
{
U:
if (type == tok!"intLiteral")
type = tok!"uintLiteral";
else
type = tok!"ulongLiteral";
range.popFront();
if (secondPass)
return;
if (range.index < range.bytes.length
&& (range.bytes[range.index] == 'L' || range.bytes[range.index] == 'l'))
goto L;
goto I;
}
if (range.bytes[range.index] == 'L' || range.bytes[range.index] == 'l')
{
L:
if (type == tok!"uintLiteral")
type = tok!"ulongLiteral";
else
type = tok!"longLiteral";
range.popFront();
if (range.index < range.bytes.length
&& (range.bytes[range.index] == 'U' || range.bytes[range.index] == 'u'))
{
secondPass = true;
goto U;
}
goto I;
}
I:
if (range.index < range.bytes.length && range.bytes[range.index] == 'i')
{
warning("Complex number literals are deprecated");
range.popFront();
if (type == tok!"longLiteral" || type == tok!"ulongLiteral")
type = tok!"idoubleLiteral";
else
type = tok!"ifloatLiteral";
}
}
void lexFloatSuffix(ref IdType type) pure nothrow @safe
{
switch (range.bytes[range.index])
{
case 'L':
range.popFront();
type = tok!"doubleLiteral";
break;
case 'f':
case 'F':
range.popFront();
type = tok!"floatLiteral";
break;
default:
break;
}
if (range.index < range.bytes.length && range.bytes[range.index] == 'i')
{
warning("Complex number literals are deprecated");
range.popFront();
if (type == tok!"floatLiteral")
type = tok!"ifloatLiteral";
else
type = tok!"idoubleLiteral";
}
}
void lexExponent(ref IdType type) pure nothrow @safe
{
range.popFront();
bool foundSign = false;
bool foundDigit = false;
while (range.index < range.bytes.length)
{
switch (range.bytes[range.index])
{
case '-':
case '+':
if (foundSign)
{
if (!foundDigit)
error("Expected an exponent");
return;
}
foundSign = true;
range.popFront();
break;
case '0': .. case '9':
case '_':
foundDigit = true;
range.popFront();
break;
case 'L':
case 'f':
case 'F':
case 'i':
lexFloatSuffix(type);
return;
default:
if (!foundDigit)
error("Expected an exponent");
return;
}
}
}
void lexScriptLine(ref Token token)
{
mixin (tokenStart);
while (!(range.index >= range.bytes.length) && !isNewline)
{
range.popFront();
}
token = Token(tok!"scriptLine", cache.intern(range.slice(mark)),
line, column, index);
}
void lexSpecialTokenSequence(ref Token token)
{
mixin (tokenStart);
while (!(range.index >= range.bytes.length) && !isNewline)
{
range.popFront();
}
token = Token(tok!"specialTokenSequence", cache.intern(range.slice(mark)),
line, column, index);
}
void lexSlashStarComment(ref Token token) @trusted
{
mixin (tokenStart);
IdType type = tok!"comment";
range.popFrontN(2);
while (range.index < range.bytes.length)
{
version (X86_64)
{
if (haveSSE42 && range.index + 16 < range.bytes.length)
skip!(false, '\r', '\n', '/', '*', 0xe2)(range.bytes.ptr + range.index,
&range.index, &range.column);
}
if (range.bytes[range.index] == '*')
{
range.popFront();
if (!(range.index >= range.bytes.length) && range.bytes[range.index] == '/')
{
range.popFront();
break;
}
}
else
popFrontWhitespaceAware();
}
if (config.commentBehavior == CommentBehavior.intern)
token = Token(type, cache.intern(range.slice(mark)), line, column, index);
else
token = Token(type, cast(string) range.slice(mark), line, column, index);
}
void lexSlashSlashComment(ref Token token) @trusted
{
mixin (tokenStart);
IdType type = tok!"comment";
range.popFrontN(2);
while (range.index < range.bytes.length)
{
version (X86_64)
{
if (haveSSE42 && range.index + 16 < range.bytes.length)
{
skip!(false, '\r', '\n', 0xe2)(range.bytes.ptr + range.index,
&range.index, &range.column);
}
}
if (range.bytes[range.index] == '\r' || range.bytes[range.index] == '\n')
break;
range.popFront();
}
if (config.commentBehavior == CommentBehavior.intern)
token = Token(type, cache.intern(range.slice(mark)), line, column, index);
else
token = Token(type, cast(string) range.slice(mark), line, column, index);
}
void lexSlashPlusComment(ref Token token) @trusted
{
mixin (tokenStart);
IdType type = tok!"comment";
range.index += 2;
range.column += 2;
int depth = 1;
while (depth > 0 && !(range.index >= range.bytes.length))
{
version (X86_64)
{
if (haveSSE42 && range.index + 16 < range.bytes.length)
{
skip!(false, '+', '/', '\\', '\r', '\n', 0xe2)(range.bytes.ptr + range.index,
&range.index, &range.column);
}
}
if (range.bytes[range.index] == '+')
{
range.popFront();
if (!(range.index >= range.bytes.length) && range.bytes[range.index] == '/')
{
range.popFront();
depth--;
}
}
else if (range.bytes[range.index] == '/')
{
range.popFront();
if (!(range.index >= range.bytes.length) && range.bytes[range.index] == '+')
{
range.popFront();
depth++;
}
}
else
popFrontWhitespaceAware();
}
if (config.commentBehavior == CommentBehavior.intern)
token = Token(type, cache.intern(range.slice(mark)), line, column, index);
else
token = Token(type, cast(string) range.slice(mark), line, column, index);
}
void lexStringLiteral(ref Token token) @trusted
{
mixin (tokenStart);
range.popFront();
while (true)
{
if (range.index >= range.bytes.length)
{
error("Error: unterminated string literal");
token = Token(tok!"");
return;
}
version (X86_64)
{
if (haveSSE42 && range.index + 16 < range.bytes.length)
{
skip!(false, '"', '\\', '\r', '\n', 0xe2)(range.bytes.ptr + range.index,
&range.index, &range.column);
}
}
if (range.bytes[range.index] == '"')
{
range.popFront();
break;
}
else if (range.bytes[range.index] == '\\')
{
if (!lexEscapeSequence())
{
token = Token.init;
return;
}
}
else
popFrontWhitespaceAware();
}
IdType type = tok!"stringLiteral";
lexStringSuffix(type);
token = Token(type, cache.intern(range.slice(mark)), line, column,
index);
}
void lexWysiwygString(ref Token token) @trusted
{
mixin (tokenStart);
IdType type = tok!"stringLiteral";
immutable bool backtick = range.bytes[range.index] == '`';
if (backtick)
{
range.popFront();
while (true)
{
if (range.index >= range.bytes.length)
{
error("Error: unterminated string literal");
token = Token(tok!"");
return;
}
version (X86_64)
{
if (haveSSE42 && range.index + 16 < range.bytes.length)
{
skip!(false, '\r', '\n', 0xe2, '`')(range.bytes.ptr + range.index,
&range.index, &range.column);
}
}
if (range.bytes[range.index] == '`')
{
range.popFront();
break;
}
else
popFrontWhitespaceAware();
}
}
else
{
range.popFront();
if (range.index >= range.bytes.length)
{
error("Error: unterminated string literal");
token = Token(tok!"");
return;
}
range.popFront();
while (true)
{
if (range.index >= range.bytes.length)
{
error("Error: unterminated string literal");
token = Token(tok!"");
return;
}
else if (range.bytes[range.index] == '"')
{
range.popFront();
break;
}
else
popFrontWhitespaceAware();
}
}
lexStringSuffix(type);
token = Token(type, cache.intern(range.slice(mark)), line, column,
index);
}
private ubyte lexStringSuffix(ref IdType type) pure nothrow @safe
{
if (range.index >= range.bytes.length)
{
type = tok!"stringLiteral";
return 0;
}
else
{
switch (range.bytes[range.index])
{
case 'w': range.popFront(); type = tok!"wstringLiteral"; return 'w';
case 'd': range.popFront(); type = tok!"dstringLiteral"; return 'd';
case 'c': range.popFront(); type = tok!"stringLiteral"; return 'c';
default: type = tok!"stringLiteral"; return 0;
}
}
}
void lexDelimitedString(ref Token token)
{
mixin (tokenStart);
range.index += 2;
range.column += 2;
ubyte open;
ubyte close;
switch (range.bytes[range.index])
{
case '<':
open = '<';
close = '>';
range.popFront();
lexNormalDelimitedString(token, mark, line, column, index, open, close);
break;
case '{':
open = '{';
close = '}';
range.popFront();
lexNormalDelimitedString(token, mark, line, column, index, open, close);
break;
case '[':
open = '[';
close = ']';
range.popFront();
lexNormalDelimitedString(token, mark, line, column, index, open, close);
break;
case '(':
open = '(';
close = ')';
range.popFront();
lexNormalDelimitedString(token, mark, line, column, index, open, close);
break;
default:
lexHeredocString(token, mark, line, column, index);
break;
}
}
void lexNormalDelimitedString(ref Token token, size_t mark, size_t line, size_t column,
size_t index, ubyte open, ubyte close)
{
int depth = 1;
while (!(range.index >= range.bytes.length) && depth > 0)
{
if (range.bytes[range.index] == open)
{
depth++;
range.popFront();
}
else if (range.bytes[range.index] == close)
{
depth--;
range.popFront();
if (depth <= 0)
{
if (range.bytes[range.index] == '"')
{
range.popFront();
}
else
{
error("Error: `\"` expected to end delimited string literal");
token = Token(tok!"");
return;
}
}
}
else
popFrontWhitespaceAware();
}
IdType type = tok!"stringLiteral";
lexStringSuffix(type);
token = Token(type, cache.intern(range.slice(mark)), line, column, index);
}
void lexHeredocString(ref Token token, size_t mark, size_t line, size_t column, size_t index)
{
Token ident;
lexIdentifier(ident);
if (isNewline())
popFrontWhitespaceAware();
else
error("Newline expected");
while (!(range.index >= range.bytes.length))
{
if (isNewline())
{
popFrontWhitespaceAware();
if (!range.canPeek(ident.text.length))
{
error(ident.text ~ " expected");
break;
}
if (range.peek(ident.text.length - 1) == ident.text)
{
range.popFrontN(ident.text.length);
break;
}
}
else
{
range.popFront();
}
}
if (!(range.index >= range.bytes.length) && range.bytes[range.index] == '"')
{
range.popFront();
}
else
error("`\"` expected");
IdType type = tok!"stringLiteral";
lexStringSuffix(type);
token = Token(type, cache.intern(range.slice(mark)), line, column, index);
}
void lexTokenString(ref Token token)
{
mixin (tokenStart);
assert (range.bytes[range.index] == 'q');
range.popFront();
assert (range.bytes[range.index] == '{');
range.popFront();
auto app = appender!string();
app.put("q{");
int depth = 1;
immutable WhitespaceBehavior oldWhitespace = config.whitespaceBehavior;
immutable StringBehavior oldString = config.stringBehavior;
config.whitespaceBehavior = WhitespaceBehavior.include;
config.stringBehavior = StringBehavior.source;
scope (exit)
{
config.whitespaceBehavior = oldWhitespace;
config.stringBehavior = oldString;
}
advance(_front);
while (depth > 0 && !empty)
{
auto t = front();
if (t.text is null)
app.put(str(t.type));
else
app.put(t.text);
if (t.type == tok!"}")
{
depth--;
if (depth > 0)
popFront();
}
else if (t.type == tok!"{")
{
depth++;
popFront();
}
else
popFront();
}
IdType type = tok!"stringLiteral";
auto b = lexStringSuffix(type);
if (b != 0)
app.put(b);
token = Token(type, cache.intern(cast(const(ubyte)[]) app.data), line,
column, index);
}
void lexHexString(ref Token token)
{
mixin (tokenStart);
range.index += 2;
range.column += 2;
loop: while (true)
{
if (range.index >= range.bytes.length)
{
error("Error: unterminated hex string literal");
token = Token(tok!"");
return;
}
else if (isWhitespace())
popFrontWhitespaceAware();
else switch (range.bytes[range.index])
{
case '0': .. case '9':
case 'A': .. case 'F':
case 'a': .. case 'f':
range.popFront();
break;
case '"':
range.popFront();
break loop;
default:
error("Error: invalid character in hex string");
token = Token(tok!"");
return;
}
}
IdType type = tok!"stringLiteral";
lexStringSuffix(type);
token = Token(type, cache.intern(range.slice(mark)), line, column,
index);
}
bool lexNamedEntity()
in { assert (range.bytes[range.index] == '&'); }
do
{
Token t;
range.popFront();
lexIdentifier(t, true);
if (t.type != tok!"identifier" || range.empty || range.bytes[range.index] != ';')
{
error("Error: invalid named character entity");
return false;
}
range.popFront();
return true;
}
bool lexEscapeSequence()
{
range.popFront();
if (range.index >= range.bytes.length)
{
error("Error: non-terminated character escape sequence.");
return false;
}
switch (range.bytes[range.index])
{
case '&': return lexNamedEntity();
case '\'':
case '"':
case '?':
case '\\':
case 'a':
case 'b':
case 'f':
case 'n':
case 'r':
case 't':
case 'v':
range.popFront();
break;
case 'x':
range.popFront();
foreach (i; 0 .. 2)
{
if (range.index >= range.bytes.length)
{
error("Error: 2 hex digits expected.");
return false;
}
switch (range.bytes[range.index])
{
case '0': .. case '9':
case 'a': .. case 'f':
case 'A': .. case 'F':
range.popFront();
break;
default:
error("Error: 2 hex digits expected.");
return false;
}
}
break;
case '0':
if (!(range.index + 1 < range.bytes.length)
|| ((range.index + 1 < range.bytes.length) && range.peekAt(1) == '\''))
{
range.popFront();
break;
}
goto case;
case '1': .. case '7':
for (size_t i = 0; i < 3 && !(range.index >= range.bytes.length)
&& range.bytes[range.index] >= '0' && range.bytes[range.index] <= '7'; i++)
range.popFront();
break;
case 'u':
range.popFront();
foreach (i; 0 .. 4)
{
if (range.index >= range.bytes.length)
{
error("Error: at least 4 hex digits expected.");
return false;
}
switch (range.bytes[range.index])
{
case '0': .. case '9':
case 'a': .. case 'f':
case 'A': .. case 'F':
range.popFront();
break;
default:
error("Error: at least 4 hex digits expected.");
return false;
}
}
break;
case 'U':
range.popFront();
foreach (i; 0 .. 8)
{
if (range.index >= range.bytes.length)
{
error("Error: at least 8 hex digits expected.");
return false;
}
switch (range.bytes[range.index])
{
case '0': .. case '9':
case 'a': .. case 'f':
case 'A': .. case 'F':
range.popFront();
break;
default:
error("Error: at least 8 hex digits expected.");
return false;
}
}
break;
default:
error("Invalid escape sequence");
while (true)
{
if (range.index >= range.bytes.length)
{
error("Error: non-terminated character escape sequence.");
break;
}
if (range.bytes[range.index] == ';')
{
range.popFront();
break;
}
else
{
range.popFront();
}
}
return false;
}
return true;
}
void lexCharacterLiteral(ref Token token)
{
mixin (tokenStart);
range.popFront();
if (range.empty)
goto err;
if (range.bytes[range.index] == '\\')
lexEscapeSequence();
else if (range.bytes[range.index] == '\'')
{
range.popFront();
token = Token(tok!"characterLiteral", cache.intern(range.slice(mark)),
line, column, index);
}
else if (range.bytes[range.index] & 0x80)
{
while (range.bytes[range.index] & 0x80)
range.popFront();
}
else
popFrontWhitespaceAware();
if (range.index < range.bytes.length && range.bytes[range.index] == '\'')
{
range.popFront();
token = Token(tok!"characterLiteral", cache.intern(range.slice(mark)),
line, column, index);
}
else
{
err:
error("Error: Expected `'` to end character literal");
token = Token(tok!"");
}
}
void lexIdentifier(ref Token token, const bool silent = false) @trusted
{
mixin (tokenStart);
if (isSeparating(0))
{
if (silent) return;
error("Invalid identifier");
range.popFront();
}
while (true)
{
version (X86_64)
{
if (haveSSE42 && range.index + 16 < range.bytes.length)
{
immutable ulong i = rangeMatch!(false, 'a', 'z', 'A', 'Z', '_', '_')
(range.bytes.ptr + range.index);
range.column += i;
range.index += i;
}
}
if (isSeparating(0))
break;
else
range.popFront();
}
token = Token(tok!"identifier", cache.intern(range.slice(mark)), line,
column, index);
}
void lexDot(ref Token token)
{
mixin (tokenStart);
if (!(range.index + 1 < range.bytes.length))
{
range.popFront();
token = Token(tok!".", null, line, column, index);
return;
}
switch (range.peekAt(1))
{
case '0': .. case '9':
lexNumber(token);
return;
case '.':
range.popFront();
range.popFront();
if (!(range.index >= range.bytes.length) && range.bytes[range.index] == '.')
{
range.popFront();
token = Token(tok!"...", null, line, column, index);
}
else
token = Token(tok!"..", null, line, column, index);
return;
default:
range.popFront();
token = Token(tok!".", null, line, column, index);
return;
}
}
void lexLongNewline(ref Token token) @nogc
{
mixin (tokenStart);
range.popFront();
range.popFront();
range.popFront();
range.incrementLine();
string text = config.whitespaceBehavior == WhitespaceBehavior.include
? cache.intern(range.slice(mark)) : "";
token = Token(tok!"whitespace", text, line,
column, index);
}
bool isNewline() @nogc
{
if (range.bytes[range.index] == '\n') return true;
if (range.bytes[range.index] == '\r') return true;
return (range.bytes[range.index] & 0x80) && (range.index + 2 < range.bytes.length)
&& (range.peek(2) == "\u2028" || range.peek(2) == "\u2029");
}
bool isSeparating(size_t offset) @nogc
{
enum : ubyte
{
n, y, m // no, yes, maybe
}
if (range.index + offset >= range.bytes.length)
return true;
auto c = range.bytes[range.index + offset];
static immutable ubyte[256] LOOKUP_TABLE = [
y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y,
y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y,
y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y,
n, n, n, n, n, n, n, n, n, n, y, y, y, y, y, y,
y, n, n, n, n, n, n, n, n, n, n, n, n, n, n, n,
n, n, n, n, n, n, n, n, n, n, n, y, y, y, y, n,
y, n, n, n, n, n, n, n, n, n, n, n, n, n, n, n,
n, n, n, n, n, n, n, n, n, n, n, y, y, y, y, y,
m, m, m, m, m, m, m, m, m, m, m, m, m, m, m, m,
m, m, m, m, m, m, m, m, m, m, m, m, m, m, m, m,
m, m, m, m, m, m, m, m, m, m, m, m, m, m, m, m,
m, m, m, m, m, m, m, m, m, m, m, m, m, m, m, m,
m, m, m, m, m, m, m, m, m, m, m, m, m, m, m, m,
m, m, m, m, m, m, m, m, m, m, m, m, m, m, m, m,
m, m, m, m, m, m, m, m, m, m, m, m, m, m, m, m,
m, m, m, m, m, m, m, m, m, m, m, m, m, m, m, m
];
immutable ubyte result = LOOKUP_TABLE[c];
if (result == n)
return false;
if (result == y)
return true;
if (result == m)
{
auto r = range;
range.popFrontN(offset);
return (r.canPeek(2) && (r.peek(2) == "\u2028"
|| r.peek(2) == "\u2029"));
}
assert (false);
}
enum tokenStart = q{
size_t index = range.index;
size_t column = range.column;
size_t line = range.line;
auto mark = range.mark();
};
void error(string message)
{
_messages ~= Message(range.line, range.column, message, true);
}
void warning(string message)
{
_messages ~= Message(range.line, range.column, message, false);
assert (_messages.length > 0);
}
Message[] _messages;
StringCache* cache;
LexerConfig config;
bool haveSSE42;
}
/**
* Creates a token range from the given source code. Creates a default lexer
* configuration and a GC-managed string cache.
*/
public auto byToken(R)(R range)
if (is(Unqual!(ElementEncodingType!R) : ubyte) && isDynamicArray!R)
{
LexerConfig config;
StringCache* cache = new StringCache(range.length.optimalBucketCount);
return DLexer(range, config, cache);
}
/**
* Creates a token range from the given source code. Uses the given string
* cache.
*/
public auto byToken(R)(R range, StringCache* cache)
if (is(Unqual!(ElementEncodingType!R) : ubyte) && isDynamicArray!R)
{
LexerConfig config;
return DLexer(range, config, cache);
}
/**
* Creates a token range from the given source code. Uses the provided lexer
* configuration and string cache.
*/
public auto byToken(R)(R range, const LexerConfig config, StringCache* cache)
if (is(Unqual!(ElementEncodingType!R) : ubyte) && isDynamicArray!R)
{
return DLexer(range, config, cache);
}
/**
* Helper function used to avoid too much allocations while lexing.
*
* Params:
* size = The length in bytes of the source file.
*
* Returns:
* The optimal initial bucket count a `StringCache` should have.
*/
size_t optimalBucketCount(size_t size)
{
import std.math : nextPow2;
return nextPow2((size + 31U) / 32U).min(1U << 30U);
}
///
unittest
{
assert(optimalBucketCount(1) == 2);
assert(optimalBucketCount(9000 * 32) == 16384);
static if (size_t.sizeof == ulong.sizeof)
assert(optimalBucketCount(100_000_000_000UL) == 1 << 30);
}
/**
* The string cache is used for string interning.
*
* It will only store a single copy of any string that it is asked to hold.
* Interned strings can be compared for equality by comparing their $(B .ptr)
* field.
*
* Default and postbilt constructors are disabled. When a StringCache goes out
* of scope, the memory held by it is freed.
*
* See_also: $(LINK http://en.wikipedia.org/wiki/String_interning)
*/
struct StringCache
{
public pure nothrow @nogc:
@disable this();
@disable this(this);
/**
* Params: bucketCount = the initial number of buckets. Must be a
* power of two
*/
this(size_t bucketCount) nothrow @trusted @nogc
in
{
import core.bitop : popcnt;
static if (size_t.sizeof == 8)
{
immutable low = popcnt(cast(uint) bucketCount);
immutable high = popcnt(cast(uint) (bucketCount >> 32));
assert ((low == 0 && high == 1) || (low == 1 && high == 0));
}
else
{
static assert (size_t.sizeof == 4);
assert (popcnt(cast(uint) bucketCount) == 1);
}
}
do
{
buckets = (cast(Node**) calloc((Node*).sizeof, bucketCount))[0 .. bucketCount];
}
~this()
{
Block* current = rootBlock;
while (current !is null)
{
Block* prev = current;
current = current.next;
free(cast(void*) prev);
}
foreach (nodePointer; buckets)
{
Node* currentNode = nodePointer;
while (currentNode !is null)
{
if (currentNode.mallocated)
free(currentNode.str.ptr);
Node* prev = currentNode;
currentNode = currentNode.next;
free(prev);
}
}
rootBlock = null;
free(buckets.ptr);
buckets = null;
}
/**
* Caches a string.
*/
string intern(const(ubyte)[] str) @safe
{
if (str is null || str.length == 0)
return "";
return _intern(str);
}
/**
* ditto
*/
string intern(string str) @trusted
{
return intern(cast(ubyte[]) str);
}
/**
* The default bucket count for the string cache.
*/
static enum defaultBucketCount = 4096;
private:
string _intern(const(ubyte)[] bytes) @trusted
{
immutable uint hash = hashBytes(bytes);
immutable size_t index = hash & (buckets.length - 1);
Node* s = find(bytes, hash);
if (s !is null)
return cast(string) s.str;
ubyte[] mem = void;
bool mallocated = bytes.length > BIG_STRING;
if (mallocated)
mem = (cast(ubyte*) malloc(bytes.length))[0 .. bytes.length];
else
mem = allocate(bytes.length);
mem[] = bytes[];
Node* node = cast(Node*) malloc(Node.sizeof);
node.str = mem;
node.hash = hash;
node.next = buckets[index];
node.mallocated = mallocated;
buckets[index] = node;
return cast(string) mem;
}
Node* find(const(ubyte)[] bytes, uint hash) @trusted
{
import std.algorithm : equal;
immutable size_t index = hash & (buckets.length - 1);
Node* node = buckets[index];
while (node !is null)
{
if (node.hash == hash && bytes == cast(ubyte[]) node.str)
return node;
node = node.next;
}
return node;
}
static uint hashBytes(const(ubyte)[] data) pure nothrow @trusted @nogc
in
{
assert (data !is null);
assert (data.length > 0);
}
do
{
immutable uint m = 0x5bd1e995;
immutable int r = 24;
uint h = cast(uint) data.length;
while (data.length >= 4)
{
uint k = (cast(ubyte) data[3]) << 24
| (cast(ubyte) data[2]) << 16
| (cast(ubyte) data[1]) << 8
| (cast(ubyte) data[0]);
k *= m;
k ^= k >> r;
k *= m;
h *= m;
h ^= k;
data = data[4 .. $];
}
switch (data.length & 3)
{
case 3:
h ^= data[2] << 16;
goto case;
case 2:
h ^= data[1] << 8;
goto case;
case 1:
h ^= data[0];
h *= m;
break;
default:
break;
}
h ^= h >> 13;
h *= m;
h ^= h >> 15;
return h;
}
ubyte[] allocate(size_t numBytes) pure nothrow @trusted @nogc
in
{
assert (numBytes != 0);
}
out (result)
{
assert (result.length == numBytes);
}
do
{
Block* r = rootBlock;
size_t i = 0;
while (i <= 3 && r !is null)
{
immutable size_t available = r.bytes.length;
immutable size_t oldUsed = r.used;
immutable size_t newUsed = oldUsed + numBytes;
if (newUsed <= available)
{
r.used = newUsed;
return r.bytes[oldUsed .. newUsed];
}
i++;
r = r.next;
}
Block* b = cast(Block*) calloc(Block.sizeof, 1);
b.used = numBytes;
b.next = rootBlock;
rootBlock = b;
return b.bytes[0 .. numBytes];
}
static struct Node
{
ubyte[] str = void;
Node* next = void;
uint hash = void;
bool mallocated = void;
}
static struct Block
{
Block* next;
size_t used;
enum BLOCK_CAPACITY = BLOCK_SIZE - size_t.sizeof - (void*).sizeof;
ubyte[BLOCK_CAPACITY] bytes;
}
static assert (BLOCK_SIZE == Block.sizeof);
enum BLOCK_SIZE = 1024 * 16;
// If a string would take up more than 1/4 of a block, allocate it outside
// of the block.
enum BIG_STRING = BLOCK_SIZE / 4;
Node*[] buckets;
Block* rootBlock;
}
private extern(C) void* calloc(size_t, size_t) nothrow pure @nogc @trusted;
private extern(C) void* malloc(size_t) nothrow pure @nogc @trusted;
private extern(C) void free(void*) nothrow pure @nogc @trusted;
unittest
{
auto source = cast(ubyte[]) q{ import std.stdio;}c;
auto tokens = getTokensForParser(source, LexerConfig(),
new StringCache(StringCache.defaultBucketCount));
assert (tokens.map!"a.type"().equal([tok!"import", tok!"identifier", tok!".",
tok!"identifier", tok!";"]));
}
/// Test \x char sequence
unittest
{
auto toks = (string s) => byToken(cast(ubyte[])s);
// valid
immutable hex = ['0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f','A','B','C','D','E','F'];
auto source = "";
foreach (h1; hex)
foreach (h2; hex)
source ~= "'\\x" ~ h1 ~ h2 ~ "'";
assert (toks(source).filter!(t => t.type != tok!"characterLiteral").empty);
// invalid
assert (toks(`'\x'`).messages[0] == DLexer.Message(1,4,"Error: 2 hex digits expected.",true));
assert (toks(`'\x_'`).messages[0] == DLexer.Message(1,4,"Error: 2 hex digits expected.",true));
assert (toks(`'\xA'`).messages[0] == DLexer.Message(1,5,"Error: 2 hex digits expected.",true));
assert (toks(`'\xAY'`).messages[0] == DLexer.Message(1,5,"Error: 2 hex digits expected.",true));
assert (toks(`'\xXX'`).messages[0] == DLexer.Message(1,4,"Error: 2 hex digits expected.",true));
}
version (X86_64)
{
version (DigitalMars)
private enum useDMDStyle = true;
else version (LDC)
private enum useDMDStyle = (__VERSION__ < 2092); // GDC-style supported since v1.22
else
private enum useDMDStyle = false; // not supported by GDC
private ulong pcmpestri(ubyte flags, chars...)(const ubyte* bytes) pure nothrow
@trusted @nogc if (chars.length <= 8)
{
enum constant = ByteCombine!chars;
enum charsLength = chars.length;
static if (useDMDStyle)
{
asm pure nothrow @nogc
{
naked;
}
version (Windows) // `bytes` in RCX
asm pure nothrow @nogc { movdqu XMM1, [RCX]; }
else // `bytes` in RDI
asm pure nothrow @nogc { movdqu XMM1, [RDI]; }
asm pure nothrow @nogc
{
mov R10, constant;
movq XMM2, R10;
mov RAX, charsLength;
mov RDX, 16;
pcmpestri XMM2, XMM1, flags;
mov RAX, RCX;
ret;
}
}
else // GDC-style inline asm (GCC basically)
{
ulong result;
asm pure nothrow @nogc
{
`movdqu %1, %%xmm1
movq %3, %%xmm2
pcmpestri %5, %%xmm1, %%xmm2`
: "=c" (result) // %0: pcmpestri result in RCX, to be stored into `result`
: "m" (*bytes), // %1: address of `bytes` string
"d" (16), // %2: length of `bytes` head in XMM1, as pcmpestri input in EDX
"r" (constant), // %3: max 8 `chars` to load into GP register, then XMM2
"a" (charsLength), // %4: length in XMM2, as pcmpestri input in EAX
"i" (flags) // %5: `flags` immediate
: "xmm1", "xmm2"; // clobbered registers
}
return result;
}
}
/**
* Skips between 0 and 16 bytes that match (or do not match) one of the
* given $(B chars).
*/
void skip(bool matching, chars...)(const ubyte* bytes, ulong* pindex, ulong* pcolumn) pure nothrow
@trusted @nogc if (chars.length <= 8)
{
static if (matching)
enum flags = 0b0001_0000;
else
enum flags = 0b0000_0000;
const r = pcmpestri!(flags, chars)(bytes);
*pindex += r;
*pcolumn += r;
}
/**
* Returns: the number of bytes starting at the given location that match
* (or do not match if $(B invert) is true) the byte ranges in $(B chars).
*/
ulong rangeMatch(bool invert, chars...)(const ubyte* bytes) pure nothrow @trusted @nogc
{
static assert(chars.length % 2 == 0);
static if (invert)
enum rangeMatchFlags = 0b0000_0100;
else
enum rangeMatchFlags = 0b0001_0100;
return pcmpestri!(rangeMatchFlags, chars)(bytes);
}
template ByteCombine(c...)
{
static assert (c.length <= 8);
static if (c.length > 1)
enum ulong ByteCombine = c[0] | (ByteCombine!(c[1..$]) << 8);
else
enum ulong ByteCombine = c[0];
}
}
unittest
{
import core.exception : RangeError;
import std.exception : assertNotThrown;
static immutable src1 = "/++";
static immutable src2 = "/**";
LexerConfig cf;
StringCache ca = StringCache(16);
assertNotThrown!RangeError(getTokensForParser(src1, cf, &ca));
assertNotThrown!RangeError(getTokensForParser(src2, cf, &ca));
}
unittest
{
static immutable src = `"\eeee"`;
LexerConfig cf;
StringCache ca = StringCache(16);
auto l = DLexer(src, cf, &ca);
assert(l.front().type == tok!"");
assert(!l.messages.empty);
}
unittest
{
alias Msg = DLexer.Message;
LexerConfig cf;
StringCache ca = StringCache(16);
{
auto l = DLexer(`"\©"`, cf, &ca);
assert(l.front().type == tok!"stringLiteral");
assert(l.messages == []);
}
{
auto l = DLexer(`"\™\⌝"`, cf, &ca);
assert(l.front().type == tok!"stringLiteral");
assert(l.messages == []);
}
{
auto l = DLexer(`"\&trade"`, cf, &ca);
assert(l.front().type == tok!"");
assert(l.messages == [ Msg(1, 9, "Error: invalid named character entity", true) ]);
}
{
auto l = DLexer(`"\™\&urcorn"`, cf, &ca);
assert(l.front().type == tok!"");
assert(l.messages == [ Msg(1, 18, "Error: invalid named character entity", true) ]);
}
{
auto l = DLexer(`"\&"`, cf, &ca);
assert(l.front().type == tok!"");
assert(l.messages == [ Msg(1, 4, "Error: invalid named character entity", true) ]);
}
{
auto l = DLexer(`"\&0"`, cf, &ca);
assert(l.front().type == tok!"");
assert(l.messages == [ Msg(1, 5, "Error: invalid named character entity", true) ]);
}
{
auto l = DLexer(`"\©`, cf, &ca);
assert(l.front().type == tok!"");
assert(l.messages == [ Msg(1, 8, "Error: invalid named character entity", true) ]);
}
{
auto l = DLexer(`"\©`, cf, &ca);
assert(l.front().type == tok!"");
assert(l.messages == [ Msg(1, 9, "Error: unterminated string literal", true) ]);
}
}
// legacy code using compatibility comment and trailingComment
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(":)");
}
/// end of file`;
LexerConfig cf;
StringCache ca = StringCache(16);
const tokens = getTokensForParser(src, cf, &ca);
void assertEquals(T)(T a, T b, string what, string file = __FILE__, size_t line = __LINE__)
{
enforce(a == b, "Failed " ~ what ~ " '" ~ a.to!string ~ "' == '" ~ b.to!string ~ "'", file, line);
}
void test(size_t index, IdType type, string comment, string trailingComment,
string file = __FILE__, size_t line = __LINE__)
{
assertEquals(tokens[index].type, type, "type", file, line);
assertEquals(tokens[index].comment, comment, "comment", file, line);
assertEquals(tokens[index].trailingComment, trailingComment, "trailingComment", file, line);
}
test(0, tok!"module", "this is a module.\nit can do stuff", "");
test(1, tok!"identifier", "", "");
test(2, tok!".", "", "");
test(3, tok!"identifier", "", "");
test(4, tok!";", "", "");
test(5, tok!"int", "some doc\nhello", "");
test(6, tok!"identifier", "", "");
test(7, tok!";", "", "very nice");
test(8, tok!"void", "", "");
test(9, tok!"identifier", "", "");
test(10, tok!"(", "", "");
test(11, tok!")", "", "");
test(12, tok!"{", "", "");
test(13, tok!"identifier", "could be better", "");
test(14, tok!"(", "", "");
test(15, tok!"stringLiteral", "", "");
test(16, tok!")", "", "");
test(17, tok!";", "", "");
test(18, tok!"}", "", "");
}
// dlang-community/D-Scanner#805
unittest
{
final class SomeExpr
{
Token tok;
}
auto e1 = new SomeExpr();
const e2 = new SomeExpr();
immutable e3 = new immutable SomeExpr();
immutable t1 = e1.tok;
immutable t2 = e2.tok;
immutable t3 = e3.tok;
}