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145 lines
4.8 KiB
C++
145 lines
4.8 KiB
C++
// Copyright 2014 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 "tools/gn/err.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/label.h"
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#include "tools/gn/parse_tree.h"
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#include "tools/gn/value.h"
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namespace functions {
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const char kGetLabelInfo[] = "get_label_info";
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const char kGetLabelInfo_HelpShort[] =
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"get_label_info: Get an attribute from a target's label.";
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const char kGetLabelInfo_Help[] =
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R"*(get_label_info: Get an attribute from a target's label.
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get_label_info(target_label, what)
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Given the label of a target, returns some attribute of that target. The
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target need not have been previously defined in the same file, since none of
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the attributes depend on the actual target definition, only the label itself.
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See also "gn help get_target_outputs".
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Possible values for the "what" parameter
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"name"
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The short name of the target. This will match the value of the
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"target_name" variable inside that target's declaration. For the label
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"//foo/bar:baz" this will return "baz".
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"dir"
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The directory containing the target's definition, with no slash at the
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end. For the label "//foo/bar:baz" this will return "//foo/bar".
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"target_gen_dir"
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The generated file directory for the target. This will match the value of
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the "target_gen_dir" variable when inside that target's declaration.
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"root_gen_dir"
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The root of the generated file tree for the target. This will match the
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value of the "root_gen_dir" variable when inside that target's
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declaration.
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"target_out_dir
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The output directory for the target. This will match the value of the
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"target_out_dir" variable when inside that target's declaration.
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"root_out_dir"
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The root of the output file tree for the target. This will match the
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value of the "root_out_dir" variable when inside that target's
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declaration.
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"label_no_toolchain"
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The fully qualified version of this label, not including the toolchain.
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For the input ":bar" it might return "//foo:bar".
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"label_with_toolchain"
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The fully qualified version of this label, including the toolchain. For
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the input ":bar" it might return "//foo:bar(//toolchain:x64)".
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"toolchain"
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The label of the toolchain. This will match the value of the
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"current_toolchain" variable when inside that target's declaration.
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Examples
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get_label_info(":foo", "name")
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# Returns string "foo".
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get_label_info("//foo/bar:baz", "target_gen_dir")
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# Returns string "//out/Debug/gen/foo/bar".
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)*";
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Value RunGetLabelInfo(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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if (args.size() != 2) {
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*err = Err(function, "Expected two arguments.");
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return Value();
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}
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// Resolve the requested label.
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Label label = Label::Resolve(scope->GetSourceDir(),
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ToolchainLabelForScope(scope), args[0], err);
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if (label.is_null())
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return Value();
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// Extract the "what" parameter.
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if (!args[1].VerifyTypeIs(Value::STRING, err))
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return Value();
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const std::string& what = args[1].string_value();
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Value result(function, Value::STRING);
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if (what == "name") {
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result.string_value() = label.name();
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} else if (what == "dir") {
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result.string_value() = DirectoryWithNoLastSlash(label.dir());
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} else if (what == "target_gen_dir") {
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result.string_value() = DirectoryWithNoLastSlash(GetSubBuildDirAsSourceDir(
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BuildDirContext(scope, label.GetToolchainLabel()),
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label.dir(),
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BuildDirType::GEN));
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} else if (what == "root_gen_dir") {
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result.string_value() = DirectoryWithNoLastSlash(GetBuildDirAsSourceDir(
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BuildDirContext(scope, label.GetToolchainLabel()), BuildDirType::GEN));
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} else if (what == "target_out_dir") {
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result.string_value() = DirectoryWithNoLastSlash(GetSubBuildDirAsSourceDir(
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BuildDirContext(scope, label.GetToolchainLabel()),
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label.dir(),
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BuildDirType::OBJ));
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} else if (what == "root_out_dir") {
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result.string_value() = DirectoryWithNoLastSlash(GetBuildDirAsSourceDir(
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BuildDirContext(scope, label.GetToolchainLabel()),
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BuildDirType::TOOLCHAIN_ROOT));
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} else if (what == "toolchain") {
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result.string_value() = label.GetToolchainLabel().GetUserVisibleName(false);
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} else if (what == "label_no_toolchain") {
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result.string_value() =
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label.GetWithNoToolchain().GetUserVisibleName(false);
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} else if (what == "label_with_toolchain") {
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result.string_value() = label.GetUserVisibleName(true);
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} else {
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*err = Err(args[1], "Unknown value for \"what\" parameter.");
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return Value();
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}
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return result;
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}
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} // namespace functions
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