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dmodule.d
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dmodule.d
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/**
* Defines a package and module.
*
* Specification: $(LINK2 https://dlang.org/spec/module.html, Modules)
*
* Copyright: Copyright (C) 1999-2022 by The D Language Foundation, All Rights Reserved
* Authors: $(LINK2 https://www.digitalmars.com, Walter Bright)
* License: $(LINK2 https://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
* Source: $(LINK2 https://github.com/dlang/dmd/blob/master/src/dmd/dmodule.d, _dmodule.d)
* Documentation: https://dlang.org/phobos/dmd_dmodule.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/dmodule.d
*/
module dmd.dmodule;
import core.stdc.stdio;
import core.stdc.stdlib;
import core.stdc.string;
import dmd.aggregate;
import dmd.arraytypes;
import dmd.astcodegen;
import dmd.astenums;
import dmd.compiler;
import dmd.gluelayer;
import dmd.dimport;
import dmd.dmacro;
import dmd.doc;
import dmd.dscope;
import dmd.dsymbol;
import dmd.dsymbolsem;
import dmd.errors;
import dmd.expression;
import dmd.expressionsem;
import dmd.file_manager;
import dmd.globals;
import dmd.id;
import dmd.identifier;
import dmd.parse;
import dmd.cparse;
import dmd.root.array;
import dmd.root.file;
import dmd.root.filename;
import dmd.common.outbuffer;
import dmd.root.port;
import dmd.root.rmem;
import dmd.root.rootobject;
import dmd.root.string;
import dmd.semantic2;
import dmd.semantic3;
import dmd.target;
import dmd.utils;
import dmd.visitor;
// function used to call semantic3 on a module's dependencies
void semantic3OnDependencies(Module m)
{
if (!m)
return;
if (m.semanticRun > PASS.semantic3)
return;
m.semantic3(null);
foreach (i; 1 .. m.aimports.dim)
semantic3OnDependencies(m.aimports[i]);
}
/**
* Remove generated .di files on error and exit
*/
void removeHdrFilesAndFail(ref Param params, ref Modules modules) nothrow
{
if (params.dihdr.doOutput)
{
foreach (m; modules)
{
if (m.filetype == FileType.dhdr)
continue;
File.remove(m.hdrfile.toChars());
}
}
fatal();
}
/**
* Converts a chain of identifiers to the filename of the module
*
* Params:
* packages = the names of the "parent" packages
* ident = the name of the child package or module
*
* Returns:
* the filename of the child package or module
*/
private const(char)[] getFilename(Identifier[] packages, Identifier ident) nothrow
{
const(char)[] filename = ident.toString();
if (packages.length == 0)
return filename;
OutBuffer buf;
OutBuffer dotmods;
auto modAliases = &global.params.modFileAliasStrings;
void checkModFileAlias(const(char)[] p)
{
/* Check and replace the contents of buf[] with
* an alias string from global.params.modFileAliasStrings[]
*/
dotmods.writestring(p);
foreach_reverse (const m; *modAliases)
{
const q = strchr(m, '=');
assert(q);
if (dotmods.length == q - m && memcmp(dotmods.peekChars(), m, q - m) == 0)
{
buf.setsize(0);
auto rhs = q[1 .. strlen(q)];
if (rhs.length > 0 && (rhs[$ - 1] == '/' || rhs[$ - 1] == '\\'))
rhs = rhs[0 .. $ - 1]; // remove trailing separator
buf.writestring(rhs);
break; // last matching entry in ms[] wins
}
}
dotmods.writeByte('.');
}
foreach (pid; packages)
{
const p = pid.toString();
buf.writestring(p);
if (modAliases.dim)
checkModFileAlias(p);
version (Windows)
enum FileSeparator = '\\';
else
enum FileSeparator = '/';
buf.writeByte(FileSeparator);
}
buf.writestring(filename);
if (modAliases.dim)
checkModFileAlias(filename);
buf.writeByte(0);
filename = buf.extractSlice()[0 .. $ - 1];
return filename;
}
/***********************************************************
*/
extern (C++) class Package : ScopeDsymbol
{
PKG isPkgMod = PKG.unknown;
uint tag; // auto incremented tag, used to mask package tree in scopes
Module mod; // !=null if isPkgMod == PKG.module_
final extern (D) this(const ref Loc loc, Identifier ident) nothrow
{
super(loc, ident);
__gshared uint packageTag;
this.tag = packageTag++;
}
override const(char)* kind() const nothrow
{
return "package";
}
override bool equals(const RootObject o) const
{
// custom 'equals' for bug 17441. "package a" and "module a" are not equal
if (this == o)
return true;
auto p = cast(Package)o;
return p && isModule() == p.isModule() && ident.equals(p.ident);
}
/****************************************************
* Input:
* packages[] the pkg1.pkg2 of pkg1.pkg2.mod
* Returns:
* the symbol table that mod should be inserted into
* Output:
* *pparent the rightmost package, i.e. pkg2, or NULL if no packages
* *ppkg the leftmost package, i.e. pkg1, or NULL if no packages
*/
extern (D) static DsymbolTable resolve(Identifier[] packages, Dsymbol* pparent, Package* ppkg)
{
DsymbolTable dst = Module.modules;
Dsymbol parent = null;
//printf("Package::resolve()\n");
if (ppkg)
*ppkg = null;
foreach (pid; packages)
{
Package pkg;
Dsymbol p = dst.lookup(pid);
if (!p)
{
pkg = new Package(Loc.initial, pid);
dst.insert(pkg);
pkg.parent = parent;
pkg.symtab = new DsymbolTable();
}
else
{
pkg = p.isPackage();
assert(pkg);
// It might already be a module, not a package, but that needs
// to be checked at a higher level, where a nice error message
// can be generated.
// dot net needs modules and packages with same name
// But we still need a symbol table for it
if (!pkg.symtab)
pkg.symtab = new DsymbolTable();
}
parent = pkg;
dst = pkg.symtab;
if (ppkg && !*ppkg)
*ppkg = pkg;
if (pkg.isModule())
{
// Return the module so that a nice error message can be generated
if (ppkg)
*ppkg = cast(Package)p;
break;
}
}
if (pparent)
*pparent = parent;
return dst;
}
override final inout(Package) isPackage() inout
{
return this;
}
/**
* Checks if pkg is a sub-package of this
*
* For example, if this qualifies to 'a1.a2' and pkg - to 'a1.a2.a3',
* this function returns 'true'. If it is other way around or qualified
* package paths conflict function returns 'false'.
*
* Params:
* pkg = possible subpackage
*
* Returns:
* see description
*/
final bool isAncestorPackageOf(const Package pkg) const
{
if (this == pkg)
return true;
if (!pkg || !pkg.parent)
return false;
return isAncestorPackageOf(pkg.parent.isPackage());
}
override Dsymbol search(const ref Loc loc, Identifier ident, int flags = SearchLocalsOnly)
{
//printf("%s Package.search('%s', flags = x%x)\n", toChars(), ident.toChars(), flags);
flags &= ~SearchLocalsOnly; // searching an import is always transitive
if (!isModule() && mod)
{
// Prefer full package name.
Dsymbol s = symtab ? symtab.lookup(ident) : null;
if (s)
return s;
//printf("[%s] through pkdmod: %s\n", loc.toChars(), toChars());
return mod.search(loc, ident, flags);
}
return ScopeDsymbol.search(loc, ident, flags);
}
override void accept(Visitor v)
{
v.visit(this);
}
final Module isPackageMod()
{
if (isPkgMod == PKG.module_)
{
return mod;
}
return null;
}
/**
* Checks for the existence of a package.d to set isPkgMod appropriately
* if isPkgMod == PKG.unknown
*/
final void resolvePKGunknown()
{
if (isModule())
return;
if (isPkgMod != PKG.unknown)
return;
Identifier[] packages;
for (Dsymbol s = this.parent; s; s = s.parent)
packages ~= s.ident;
reverse(packages);
if (FileManager.lookForSourceFile(getFilename(packages, ident), global.path ? (*global.path)[] : null))
Module.load(Loc.initial, packages, this.ident);
else
isPkgMod = PKG.package_;
}
}
/***********************************************************
*/
extern (C++) final class Module : Package
{
extern (C++) __gshared Module rootModule;
extern (C++) __gshared DsymbolTable modules; // symbol table of all modules
extern (C++) __gshared Modules amodules; // array of all modules
extern (C++) __gshared Dsymbols deferred; // deferred Dsymbol's needing semantic() run on them
extern (C++) __gshared Dsymbols deferred2; // deferred Dsymbol's needing semantic2() run on them
extern (C++) __gshared Dsymbols deferred3; // deferred Dsymbol's needing semantic3() run on them
extern (C++) __gshared uint dprogress; // progress resolving the deferred list
static void _init()
{
modules = new DsymbolTable();
}
/**
* Deinitializes the global state of the compiler.
*
* This can be used to restore the state set by `_init` to its original
* state.
*/
static void deinitialize()
{
modules = modules.init;
}
extern (C++) __gshared AggregateDeclaration moduleinfo;
const(char)[] arg; // original argument name
ModuleDeclaration* md; // if !=null, the contents of the ModuleDeclaration declaration
const FileName srcfile; // input source file
const FileName objfile; // output .obj file
const FileName hdrfile; // 'header' file
FileName docfile; // output documentation file
const(ubyte)[] src; /// Raw content of the file
uint errors; // if any errors in file
uint numlines; // number of lines in source file
FileType filetype; // source file type
bool hasAlwaysInlines; // contains references to functions that must be inlined
bool isPackageFile; // if it is a package.d
Package pkg; // if isPackageFile is true, the Package that contains this package.d
Strings contentImportedFiles; // array of files whose content was imported
int needmoduleinfo;
int selfimports; // 0: don't know, 1: does not, 2: does
Dsymbol[void*] tagSymTab; /// ImportC: tag symbols that conflict with other symbols used as the index
private OutBuffer defines; // collect all the #define lines here
/*************************************
* Return true if module imports itself.
*/
bool selfImports()
{
//printf("Module::selfImports() %s\n", toChars());
if (selfimports == 0)
{
foreach (Module m; amodules)
m.insearch = 0;
selfimports = imports(this) + 1;
foreach (Module m; amodules)
m.insearch = 0;
}
return selfimports == 2;
}
int rootimports; // 0: don't know, 1: does not, 2: does
/*************************************
* Return true if module imports root module.
*/
bool rootImports()
{
//printf("Module::rootImports() %s\n", toChars());
if (rootimports == 0)
{
foreach (Module m; amodules)
m.insearch = 0;
rootimports = 1;
foreach (Module m; amodules)
{
if (m.isRoot() && imports(m))
{
rootimports = 2;
break;
}
}
foreach (Module m; amodules)
m.insearch = 0;
}
return rootimports == 2;
}
int insearch;
Identifier searchCacheIdent;
Dsymbol searchCacheSymbol; // cached value of search
int searchCacheFlags; // cached flags
/**
* A root module is one that will be compiled all the way to
* object code. This field holds the root module that caused
* this module to be loaded. If this module is a root module,
* then it will be set to `this`. This is used to determine
* ownership of template instantiation.
*/
Module importedFrom;
Dsymbols* decldefs; // top level declarations for this Module
Modules aimports; // all imported modules
uint debuglevel; // debug level
Identifiers* debugids; // debug identifiers
Identifiers* debugidsNot; // forward referenced debug identifiers
uint versionlevel; // version level
Identifiers* versionids; // version identifiers
Identifiers* versionidsNot; // forward referenced version identifiers
MacroTable macrotable; // document comment macros
Escape* _escapetable; // document comment escapes
size_t nameoffset; // offset of module name from start of ModuleInfo
size_t namelen; // length of module name in characters
extern (D) this(const ref Loc loc, const(char)[] filename, Identifier ident, int doDocComment, int doHdrGen)
{
super(loc, ident);
const(char)[] srcfilename;
//printf("Module::Module(filename = '%.*s', ident = '%s')\n", cast(int)filename.length, filename.ptr, ident.toChars());
this.arg = filename;
srcfilename = FileName.defaultExt(filename, mars_ext);
if (target.run_noext && global.params.run &&
!FileName.ext(filename) &&
FileName.exists(srcfilename) == 0 &&
FileName.exists(filename) == 1)
{
FileName.free(srcfilename.ptr);
srcfilename = FileName.removeExt(filename); // just does a mem.strdup(filename)
}
else if (!FileName.equalsExt(srcfilename, mars_ext) &&
!FileName.equalsExt(srcfilename, hdr_ext) &&
!FileName.equalsExt(srcfilename, c_ext) &&
!FileName.equalsExt(srcfilename, i_ext) &&
!FileName.equalsExt(srcfilename, dd_ext))
{
error("source file name '%.*s' must have .%.*s extension",
cast(int)srcfilename.length, srcfilename.ptr,
cast(int)mars_ext.length, mars_ext.ptr);
fatal();
}
srcfile = FileName(srcfilename);
objfile = setOutfilename(global.params.objname, global.params.objdir, filename, target.obj_ext);
if (doDocComment)
setDocfile();
if (doHdrGen)
hdrfile = setOutfilename(global.params.dihdr.name, global.params.dihdr.dir, arg, hdr_ext);
}
extern (D) this(const(char)[] filename, Identifier ident, int doDocComment, int doHdrGen)
{
this(Loc.initial, filename, ident, doDocComment, doHdrGen);
}
static Module create(const(char)* filename, Identifier ident, int doDocComment, int doHdrGen)
{
return create(filename.toDString, ident, doDocComment, doHdrGen);
}
extern (D) static Module create(const(char)[] filename, Identifier ident, int doDocComment, int doHdrGen)
{
return new Module(Loc.initial, filename, ident, doDocComment, doHdrGen);
}
extern (C++) static Module load(const ref Loc loc, Identifiers* packages, Identifier ident)
{
return load(loc, packages ? (*packages)[] : null, ident);
}
extern (D) static Module load(const ref Loc loc, Identifier[] packages, Identifier ident)
{
//printf("Module::load(ident = '%s')\n", ident.toChars());
// Build module filename by turning:
// foo.bar.baz
// into:
// foo\bar\baz
const(char)[] filename = getFilename(packages, ident);
// Look for the source file
if (const result = FileManager.lookForSourceFile(filename, global.path ? (*global.path)[] : null))
filename = result; // leaks
auto m = new Module(loc, filename, ident, 0, 0);
if (!m.read(loc))
return null;
if (global.params.verbose)
{
OutBuffer buf;
foreach (pid; packages)
{
buf.writestring(pid.toString());
buf.writeByte('.');
}
buf.printf("%s\t(%s)", ident.toChars(), m.srcfile.toChars());
message("import %s", buf.peekChars());
}
if((m = m.parse()) is null) return null;
return m;
}
override const(char)* kind() const
{
return "module";
}
/*********************************************
* Combines things into output file name for .html and .di files.
* Input:
* name Command line name given for the file, NULL if none
* dir Command line directory given for the file, NULL if none
* arg Name of the source file
* ext File name extension to use if 'name' is NULL
* global.params.preservePaths get output path from arg
* srcfile Input file - output file name must not match input file
*/
extern(D) FileName setOutfilename(const(char)[] name, const(char)[] dir, const(char)[] arg, const(char)[] ext)
{
const(char)[] docfilename;
if (name)
{
docfilename = name;
}
else
{
const(char)[] argdoc;
OutBuffer buf;
if (arg == "__stdin.d")
{
version (Posix)
import core.sys.posix.unistd : getpid;
else version (Windows)
import core.sys.windows.winbase : getpid = GetCurrentProcessId;
buf.printf("__stdin_%d.d", getpid());
arg = buf[];
}
if (global.params.preservePaths)
argdoc = arg;
else
argdoc = FileName.name(arg);
// If argdoc doesn't have an absolute path, make it relative to dir
if (!FileName.absolute(argdoc))
{
//FileName::ensurePathExists(dir);
argdoc = FileName.combine(dir, argdoc);
}
docfilename = FileName.forceExt(argdoc, ext);
}
if (FileName.equals(docfilename, srcfile.toString()))
{
error("source file and output file have same name '%s'", srcfile.toChars());
fatal();
}
return FileName(docfilename);
}
extern (D) void setDocfile()
{
docfile = setOutfilename(global.params.ddoc.name, global.params.ddoc.dir, arg, doc_ext);
}
/**
* Trigger the relevant semantic error when a file cannot be read
*
* We special case `object.d` as a failure is likely to be a rare
* but difficult to diagnose case for the user. Packages also require
* special handling to avoid exposing the compiler's internals.
*
* Params:
* loc = The location at which the file read originated (e.g. import)
*/
private void onFileReadError(const ref Loc loc)
{
if (FileName.equals(srcfile.toString(), "object.d"))
{
.error(loc, "cannot find source code for runtime library file 'object.d'");
errorSupplemental(loc, "dmd might not be correctly installed. Run 'dmd -man' for installation instructions.");
const dmdConfFile = global.inifilename.length ? FileName.canonicalName(global.inifilename) : "not found";
errorSupplemental(loc, "config file: %.*s", cast(int)dmdConfFile.length, dmdConfFile.ptr);
}
else if (FileName.ext(this.arg) || !loc.isValid())
{
// Modules whose original argument name has an extension, or do not
// have a valid location come from the command-line.
// Error that their file cannot be found and return early.
.error(loc, "cannot find input file `%s`", srcfile.toChars());
}
else
{
// if module is not named 'package' but we're trying to read 'package.d', we're looking for a package module
bool isPackageMod = (strcmp(toChars(), "package") != 0) && (strcmp(srcfile.name(), package_d) == 0 || (strcmp(srcfile.name(), package_di) == 0));
if (isPackageMod)
.error(loc, "importing package '%s' requires a 'package.d' file which cannot be found in '%s'", toChars(), srcfile.toChars());
else
{
.error(loc, "unable to read module `%s`", toChars());
const pkgfile = FileName.combine(FileName.removeExt(srcfile.toString()), package_d);
.errorSupplemental(loc, "Expected '%s' or '%s' in one of the following import paths:",
srcfile.toChars(), pkgfile.ptr);
}
}
if (!global.gag)
{
/* Print path
*/
if (global.path)
{
foreach (i, p; *global.path)
fprintf(stderr, "import path[%llu] = %s\n", cast(ulong)i, p);
}
else
{
fprintf(stderr, "Specify path to file '%s' with -I switch\n", srcfile.toChars());
}
removeHdrFilesAndFail(global.params, Module.amodules);
}
}
/**
* Reads the file from `srcfile` and loads the source buffer.
*
* If makefile module dependency is requested, we add this module
* to the list of dependencies from here.
*
* Params:
* loc = the location
*
* Returns: `true` if successful
*/
bool read(const ref Loc loc)
{
if (this.src)
return true; // already read
//printf("Module::read('%s') file '%s'\n", toChars(), srcfile.toChars());
/* Preprocess the file if it's a .c file
*/
FileName filename = srcfile;
bool ifile = false; // did we generate a .i file
scope (exit)
{
if (ifile)
File.remove(filename.toChars()); // remove generated file
}
if (global.preprocess &&
FileName.equalsExt(srcfile.toString(), c_ext) &&
FileName.exists(srcfile.toString()))
{
filename = global.preprocess(srcfile, loc, global.params.cppswitches, ifile, &defines); // run C preprocessor
}
version (Windows)
{
if (global.params.verbose) { message("lookup: %s", filename.toChars()); }
}
if (auto result = global.fileManager.lookup(filename))
{
version (Windows)
{
if (0 && global.params.verbose && strcmp(filename.toChars(), "defines.i".ptr) == 0)
{ OutBuffer bufm; bufm.writestring(cast(string)result); message("result: %s", bufm.peekChars()); }
}
this.src = result;
if (global.params.makeDeps.doOutput)
global.params.makeDeps.files.push(srcfile.toChars());
return true;
}
this.onFileReadError(loc);
return false;
}
/// syntactic parse
Module parse()
{
return parseModule!ASTCodegen();
}
/// ditto
extern (D) Module parseModule(AST)()
{
enum Endian { little, big}
enum SourceEncoding { utf16, utf32}
/*
* Convert a buffer from UTF32 to UTF8
* Params:
* Endian = is the buffer big/little endian
* buf = buffer of UTF32 data
* Returns:
* input buffer reencoded as UTF8
*/
char[] UTF32ToUTF8(Endian endian)(const(char)[] buf)
{
static if (endian == Endian.little)
alias readNext = Port.readlongLE;
else
alias readNext = Port.readlongBE;
if (buf.length & 3)
{
error("odd length of UTF-32 char source %llu", cast(ulong) buf.length);
return null;
}
const (uint)[] eBuf = cast(const(uint)[])buf;
OutBuffer dbuf;
dbuf.reserve(eBuf.length);
foreach (i; 0 .. eBuf.length)
{
const u = readNext(&eBuf[i]);
if (u & ~0x7F)
{
if (u > 0x10FFFF)
{
error("UTF-32 value %08x greater than 0x10FFFF", u);
return null;
}
dbuf.writeUTF8(u);
}
else
dbuf.writeByte(u);
}
dbuf.writeByte(0); //add null terminator
return dbuf.extractSlice();
}
/*
* Convert a buffer from UTF16 to UTF8
* Params:
* Endian = is the buffer big/little endian
* buf = buffer of UTF16 data
* Returns:
* input buffer reencoded as UTF8
*/
char[] UTF16ToUTF8(Endian endian)(const(char)[] buf)
{
static if (endian == Endian.little)
alias readNext = Port.readwordLE;
else
alias readNext = Port.readwordBE;
if (buf.length & 1)
{
error("odd length of UTF-16 char source %llu", cast(ulong) buf.length);
return null;
}
const (ushort)[] eBuf = cast(const(ushort)[])buf;
OutBuffer dbuf;
dbuf.reserve(eBuf.length);
//i will be incremented in the loop for high codepoints
foreach (ref i; 0 .. eBuf.length)
{
uint u = readNext(&eBuf[i]);
if (u & ~0x7F)
{
if (0xD800 <= u && u < 0xDC00)
{
i++;
if (i >= eBuf.length)
{
error("surrogate UTF-16 high value %04x at end of file", u);
return null;
}
const u2 = readNext(&eBuf[i]);
if (u2 < 0xDC00 || 0xE000 <= u2)
{
error("surrogate UTF-16 low value %04x out of range", u2);
return null;
}
u = (u - 0xD7C0) << 10;
u |= (u2 - 0xDC00);
}
else if (u >= 0xDC00 && u <= 0xDFFF)
{
error("unpaired surrogate UTF-16 value %04x", u);
return null;
}
else if (u == 0xFFFE || u == 0xFFFF)
{
error("illegal UTF-16 value %04x", u);
return null;
}
dbuf.writeUTF8(u);
}
else
dbuf.writeByte(u);
}
dbuf.writeByte(0); //add a terminating null byte
return dbuf.extractSlice();
}
const(char)* srcname = srcfile.toChars();
//printf("Module::parse(srcname = '%s')\n", srcname);
isPackageFile = (strcmp(srcfile.name(), package_d) == 0 ||
strcmp(srcfile.name(), package_di) == 0);
const(char)[] buf = cast(const(char)[]) this.src;
bool needsReencoding = true;
bool hasBOM = true; //assume there's a BOM
Endian endian;
SourceEncoding sourceEncoding;
if (buf.length >= 2)
{
/* Convert all non-UTF-8 formats to UTF-8.
* BOM : https://www.unicode.org/faq/utf_bom.html
* 00 00 FE FF UTF-32BE, big-endian
* FF FE 00 00 UTF-32LE, little-endian
* FE FF UTF-16BE, big-endian
* FF FE UTF-16LE, little-endian
* EF BB BF UTF-8
*/
if (buf[0] == 0xFF && buf[1] == 0xFE)
{
endian = Endian.little;
sourceEncoding = buf.length >= 4 && buf[2] == 0 && buf[3] == 0
? SourceEncoding.utf32
: SourceEncoding.utf16;
}
else if (buf[0] == 0xFE && buf[1] == 0xFF)
{
endian = Endian.big;
sourceEncoding = SourceEncoding.utf16;
}
else if (buf.length >= 4 && buf[0] == 0 && buf[1] == 0 && buf[2] == 0xFE && buf[3] == 0xFF)
{
endian = Endian.big;
sourceEncoding = SourceEncoding.utf32;
}
else if (buf.length >= 3 && buf[0] == 0xEF && buf[1] == 0xBB && buf[2] == 0xBF)
{
needsReencoding = false;//utf8 with BOM
}
else
{
/* There is no BOM. Make use of Arcane Jill's insight that
* the first char of D source must be ASCII to
* figure out the encoding.
*/
hasBOM = false;
if (buf.length >= 4 && buf[1] == 0 && buf[2] == 0 && buf[3] == 0)
{
endian = Endian.little;
sourceEncoding = SourceEncoding.utf32;
}
else if (buf.length >= 4 && buf[0] == 0 && buf[1] == 0 && buf[2] == 0)
{
endian = Endian.big;
sourceEncoding = SourceEncoding.utf32;
}
else if (buf.length >= 2 && buf[1] == 0) //try to check for UTF-16
{
endian = Endian.little;
sourceEncoding = SourceEncoding.utf16;
}
else if (buf[0] == 0)
{
endian = Endian.big;
sourceEncoding = SourceEncoding.utf16;
}
else {
// It's UTF-8
needsReencoding = false;
if (buf[0] >= 0x80)
{
error("source file must start with BOM or ASCII character, not \\x%02X", buf[0]);
return null;
}
}
}
//throw away BOM
if (hasBOM)
{
if (!needsReencoding) buf = buf[3..$];// utf-8 already
else if (sourceEncoding == SourceEncoding.utf32) buf = buf[4..$];
else buf = buf[2..$]; //utf 16
}
}
// Assume the buffer is from memory and has not be read from disk. Assume UTF-8.
else if (buf.length >= 1 && (buf[0] == '\0' || buf[0] == 0x1A))
needsReencoding = false;
//printf("%s, %d, %d, %d\n", srcfile.name.toChars(), needsReencoding, endian == Endian.little, sourceEncoding == SourceEncoding.utf16);
if (needsReencoding)
{
if (sourceEncoding == SourceEncoding.utf16)
{
buf = endian == Endian.little
? UTF16ToUTF8!(Endian.little)(buf)
: UTF16ToUTF8!(Endian.big)(buf);
}
else
{
buf = endian == Endian.little
? UTF32ToUTF8!(Endian.little)(buf)
: UTF32ToUTF8!(Endian.big)(buf);
}
// an error happened on UTF conversion
if (buf is null) return null;
}
/* If it starts with the string "Ddoc", then it's a documentation
* source file.
*/
if (buf.length>= 4 && buf[0..4] == "Ddoc")
{
comment = buf.ptr + 4;
filetype = FileType.ddoc;
if (!docfile)
setDocfile();
return this;
}
/* If it has the extension ".dd", it is also a documentation
* source file. Documentation source files may begin with "Ddoc"
* but do not have to if they have the .dd extension.
* https://issues.dlang.org/show_bug.cgi?id=15465
*/
if (FileName.equalsExt(arg, dd_ext))
{
comment = buf.ptr; // the optional Ddoc, if present, is handled above.
filetype = FileType.ddoc;
if (!docfile)
setDocfile();
return this;
}
/* If it has the extension ".di", it is a "header" file.
*/
if (FileName.equalsExt(arg, hdr_ext))
filetype = FileType.dhdr;
/// Promote `this` to a root module if requested via `-i`
void checkCompiledImport()
{
if (!this.isRoot() && Compiler.onImport(this))
this.importedFrom = this;
}
DsymbolTable dst;
Package ppack = null;
/* If it has the extension ".c", it is a "C" file.
* If it has the extension ".i", it is a preprocessed "C" file.
*/
if (FileName.equalsExt(arg, c_ext) || FileName.equalsExt(arg, i_ext))
{
filetype = FileType.c;
scope p = new CParser!AST(this, buf, cast(bool) docfile, target.c, &defines);
p.nextToken();
checkCompiledImport();
members = p.parseModule();
assert(!p.md); // C doesn't have module declarations
numlines = p.scanloc.linnum;
}
else
{
scope p = new Parser!AST(this, buf, cast(bool) docfile);
p.nextToken();