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296 lines
10 KiB
C++
296 lines
10 KiB
C++
// Copyright (c) 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include <stddef.h>
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#include "tools/gn/build_settings.h"
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#include "tools/gn/filesystem_utils.h"
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#include "tools/gn/functions.h"
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#include "tools/gn/parse_tree.h"
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#include "tools/gn/scope.h"
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#include "tools/gn/settings.h"
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#include "tools/gn/source_dir.h"
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#include "tools/gn/source_file.h"
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#include "tools/gn/value.h"
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namespace functions {
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namespace {
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// We want the output to match the input in terms of ending in a slash or not.
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// Through all the transformations, these can get added or removed in various
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// cases.
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void MakeSlashEndingMatchInput(const std::string& input, std::string* output) {
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if (EndsWithSlash(input)) {
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if (!EndsWithSlash(*output)) // Preserve same slash type as input.
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output->push_back(input[input.size() - 1]);
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} else {
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if (EndsWithSlash(*output))
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output->resize(output->size() - 1);
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}
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}
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// Returns true if the given value looks like a directory, otherwise we'll
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// assume it's a file.
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bool ValueLooksLikeDir(const std::string& value) {
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if (value.empty())
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return true;
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size_t value_size = value.size();
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// Count the number of dots at the end of the string.
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size_t num_dots = 0;
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while (num_dots < value_size && value[value_size - num_dots - 1] == '.')
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num_dots++;
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if (num_dots == value.size())
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return true; // String is all dots.
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if (IsSlash(value[value_size - num_dots - 1]))
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return true; // String is a [back]slash followed by 0 or more dots.
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// Anything else.
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return false;
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}
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Value ConvertOnePath(const Scope* scope,
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const FunctionCallNode* function,
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const Value& value,
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const SourceDir& from_dir,
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const SourceDir& to_dir,
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bool convert_to_system_absolute,
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Err* err) {
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Value result; // Ensure return value optimization.
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if (!value.VerifyTypeIs(Value::STRING, err))
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return result;
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const std::string& string_value = value.string_value();
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bool looks_like_dir = ValueLooksLikeDir(string_value);
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// System-absolute output special case.
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if (convert_to_system_absolute) {
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base::FilePath system_path;
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if (looks_like_dir) {
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system_path = scope->settings()->build_settings()->GetFullPath(
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from_dir.ResolveRelativeDir(value, err,
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scope->settings()->build_settings()->root_path_utf8()));
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} else {
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system_path = scope->settings()->build_settings()->GetFullPath(
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from_dir.ResolveRelativeFile(value, err,
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scope->settings()->build_settings()->root_path_utf8()));
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}
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if (err->has_error())
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return Value();
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result = Value(function, FilePathToUTF8(system_path));
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if (looks_like_dir)
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MakeSlashEndingMatchInput(string_value, &result.string_value());
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return result;
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}
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result = Value(function, Value::STRING);
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if (looks_like_dir) {
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result.string_value() = RebasePath(
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from_dir.ResolveRelativeDir(value, err,
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scope->settings()->build_settings()->root_path_utf8()).value(),
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to_dir,
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scope->settings()->build_settings()->root_path_utf8());
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MakeSlashEndingMatchInput(string_value, &result.string_value());
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} else {
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SourceFile resolved_file =
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from_dir.ResolveRelativeFile(value, err,
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scope->settings()->build_settings()->root_path_utf8());
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if (err->has_error())
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return Value();
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// Special case:
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// rebase_path("//foo", "//bar") ==> "../foo"
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// rebase_path("//foo", "//foo") ==> "." and not "../foo"
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if (resolved_file.value() ==
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to_dir.value().substr(0, to_dir.value().size() - 1)) {
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result.string_value() = ".";
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} else {
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result.string_value() = RebasePath(
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resolved_file.value(),
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to_dir,
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scope->settings()->build_settings()->root_path_utf8());
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}
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}
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return result;
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}
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} // namespace
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const char kRebasePath[] = "rebase_path";
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const char kRebasePath_HelpShort[] =
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"rebase_path: Rebase a file or directory to another location.";
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const char kRebasePath_Help[] =
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R"(rebase_path: Rebase a file or directory to another location.
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converted = rebase_path(input,
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new_base = "",
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current_base = ".")
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Takes a string argument representing a file name, or a list of such strings
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and converts it/them to be relative to a different base directory.
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When invoking the compiler or scripts, GN will automatically convert sources
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and include directories to be relative to the build directory. However, if
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you're passing files directly in the "args" array or doing other manual
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manipulations where GN doesn't know something is a file name, you will need
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to convert paths to be relative to what your tool is expecting.
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The common case is to use this to convert paths relative to the current
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directory to be relative to the build directory (which will be the current
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directory when executing scripts).
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If you want to convert a file path to be source-absolute (that is, beginning
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with a double slash like "//foo/bar"), you should use the get_path_info()
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function. This function won't work because it will always make relative
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paths, and it needs to support making paths relative to the source root, so
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can't also generate source-absolute paths without more special-cases.
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Arguments
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input
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A string or list of strings representing file or directory names These
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can be relative paths ("foo/bar.txt"), system absolute paths
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("/foo/bar.txt"), or source absolute paths ("//foo/bar.txt").
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new_base
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The directory to convert the paths to be relative to. This can be an
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absolute path or a relative path (which will be treated as being relative
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to the current BUILD-file's directory).
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As a special case, if new_base is the empty string (the default), all
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paths will be converted to system-absolute native style paths with system
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path separators. This is useful for invoking external programs.
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current_base
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Directory representing the base for relative paths in the input. If this
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is not an absolute path, it will be treated as being relative to the
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current build file. Use "." (the default) to convert paths from the
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current BUILD-file's directory.
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Return value
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The return value will be the same type as the input value (either a string or
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a list of strings). All relative and source-absolute file names will be
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converted to be relative to the requested output System-absolute paths will
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be unchanged.
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Whether an output path will end in a slash will match whether the
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corresponding input path ends in a slash. It will return "." or "./"
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(depending on whether the input ends in a slash) to avoid returning empty
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strings. This means if you want a root path ("//" or "/") not ending in a
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slash, you can add a dot ("//.").
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Example
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# Convert a file in the current directory to be relative to the build
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# directory (the current dir when executing compilers and scripts).
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foo = rebase_path("myfile.txt", root_build_dir)
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# might produce "../../project/myfile.txt".
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# Convert a file to be system absolute:
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foo = rebase_path("myfile.txt")
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# Might produce "D:\\source\\project\\myfile.txt" on Windows or
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# "/home/you/source/project/myfile.txt" on Linux.
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# Typical usage for converting to the build directory for a script.
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action("myscript") {
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# Don't convert sources, GN will automatically convert these to be relative
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# to the build directory when it constructs the command line for your
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# script.
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sources = [ "foo.txt", "bar.txt" ]
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# Extra file args passed manually need to be explicitly converted
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# to be relative to the build directory:
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args = [
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"--data",
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rebase_path("//mything/data/input.dat", root_build_dir),
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"--rel",
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rebase_path("relative_path.txt", root_build_dir)
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] + rebase_path(sources, root_build_dir)
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}
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)";
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Value RunRebasePath(Scope* scope,
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const FunctionCallNode* function,
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const std::vector<Value>& args,
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Err* err) {
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Value result;
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// Argument indices.
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static const size_t kArgIndexInputs = 0;
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static const size_t kArgIndexDest = 1;
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static const size_t kArgIndexFrom = 2;
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// Inputs.
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if (args.size() < 1 || args.size() > 3) {
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*err = Err(function->function(), "Wrong # of arguments for rebase_path.");
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return result;
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}
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const Value& inputs = args[kArgIndexInputs];
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// To path.
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bool convert_to_system_absolute = true;
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SourceDir to_dir;
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const SourceDir& current_dir = scope->GetSourceDir();
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if (args.size() > kArgIndexDest) {
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if (!args[kArgIndexDest].VerifyTypeIs(Value::STRING, err))
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return result;
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if (!args[kArgIndexDest].string_value().empty()) {
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to_dir = current_dir.ResolveRelativeDir(
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args[kArgIndexDest], err,
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scope->settings()->build_settings()->root_path_utf8());
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if (err->has_error())
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return Value();
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convert_to_system_absolute = false;
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}
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}
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// From path.
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SourceDir from_dir;
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if (args.size() > kArgIndexFrom) {
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if (!args[kArgIndexFrom].VerifyTypeIs(Value::STRING, err))
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return result;
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from_dir = current_dir.ResolveRelativeDir(
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args[kArgIndexFrom], err,
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scope->settings()->build_settings()->root_path_utf8());
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if (err->has_error())
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return Value();
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} else {
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// Default to current directory if unspecified.
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from_dir = current_dir;
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}
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// Path conversion.
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if (inputs.type() == Value::STRING) {
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return ConvertOnePath(scope, function, inputs,
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from_dir, to_dir, convert_to_system_absolute, err);
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} else if (inputs.type() == Value::LIST) {
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result = Value(function, Value::LIST);
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result.list_value().reserve(inputs.list_value().size());
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for (const auto& input : inputs.list_value()) {
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result.list_value().push_back(
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ConvertOnePath(scope, function, input,
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from_dir, to_dir, convert_to_system_absolute, err));
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if (err->has_error()) {
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result = Value();
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return result;
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}
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}
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return result;
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}
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*err = Err(function->function(),
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"rebase_path requires a list or a string.");
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return result;
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}
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} // namespace functions
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