264 lines
9.1 KiB
C++
264 lines
9.1 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 "tools/gn/label.h"
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#include "base/logging.h"
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#include "tools/gn/err.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 {
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// We print user visible label names with no trailing slash after the
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// directory name.
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std::string DirWithNoTrailingSlash(const SourceDir& dir) {
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// Be careful not to trim if the input is just "/" or "//".
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if (dir.value().size() > 2)
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return dir.value().substr(0, dir.value().size() - 1);
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return dir.value();
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}
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// Given the separate-out input (everything before the colon) in the dep rule,
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// computes the final build rule. Sets err on failure. On success,
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// |*used_implicit| will be set to whether the implicit current directory was
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// used. The value is used only for generating error messages.
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bool ComputeBuildLocationFromDep(const Value& input_value,
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const SourceDir& current_dir,
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const base::StringPiece& input,
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SourceDir* result,
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Err* err) {
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// No rule, use the current locaton.
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if (input.empty()) {
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*result = current_dir;
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return true;
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}
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// Don't allow directories to start with a single slash. All labels must be
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// in the source root.
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if (input[0] == '/' && (input.size() == 1 || input[1] != '/')) {
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*err = Err(input_value, "Label can't start with a single slash",
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"Labels must be either relative (no slash at the beginning) or be "
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"absolute\ninside the source root (two slashes at the beginning).");
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return false;
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}
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*result = current_dir.ResolveRelativeDir(input);
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return true;
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}
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// Given the separated-out target name (after the colon) computes the final
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// name, using the implicit name from the previously-generated
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// computed_location if necessary. The input_value is used only for generating
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// error messages.
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bool ComputeTargetNameFromDep(const Value& input_value,
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const SourceDir& computed_location,
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const base::StringPiece& input,
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std::string* result,
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Err* err) {
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if (!input.empty()) {
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// Easy case: input is specified, just use it.
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result->assign(input.data(), input.size());
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return true;
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}
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const std::string& loc = computed_location.value();
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// Use implicit name. The path will be "//", "//base/", "//base/i18n/", etc.
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if (loc.size() <= 1) {
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*err = Err(input_value, "This dependency name is empty");
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return false;
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}
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size_t next_to_last_slash = loc.rfind('/', loc.size() - 2);
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DCHECK(next_to_last_slash != std::string::npos);
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result->assign(&loc[next_to_last_slash + 1],
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loc.size() - next_to_last_slash - 2);
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return true;
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}
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// The original value is used only for error reporting, use the |input| as the
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// input to this function (which may be a substring of the original value when
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// we're parsing toolchains.
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//
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// If the output toolchain vars are NULL, then we'll report an error if we
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// find a toolchain specified (this is used when recursively parsing toolchain
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// labels which themselves can't have toolchain specs).
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//
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// We assume that the output variables are initialized to empty so we don't
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// write them unless we need them to contain something.
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//
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// Returns true on success. On failure, the out* variables might be written to
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// but shouldn't be used.
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bool Resolve(const SourceDir& current_dir,
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const Label& current_toolchain,
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const Value& original_value,
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const base::StringPiece& input,
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SourceDir* out_dir,
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std::string* out_name,
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SourceDir* out_toolchain_dir,
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std::string* out_toolchain_name,
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Err* err) {
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// To workaround the problem that StringPiece operator[] doesn't return a ref.
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const char* input_str = input.data();
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size_t path_separator = input.find_first_of(":(");
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base::StringPiece location_piece;
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base::StringPiece name_piece;
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base::StringPiece toolchain_piece;
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if (path_separator == std::string::npos) {
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location_piece = input;
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// Leave name & toolchain piece null.
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} else {
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location_piece = base::StringPiece(&input_str[0], path_separator);
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size_t toolchain_separator = input.find('(', path_separator);
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if (toolchain_separator == std::string::npos) {
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name_piece = base::StringPiece(&input_str[path_separator + 1],
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input.size() - path_separator - 1);
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// Leave location piece null.
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} else if (!out_toolchain_dir) {
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// Toolchain specified but not allows in this context.
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*err = Err(original_value, "Toolchain has a toolchain.",
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"Your toolchain definition (inside the parens) seems to itself "
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"have a\ntoolchain. Don't do this.");
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return false;
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} else {
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// Name piece is everything between the two separators. Note that the
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// separators may be the same (e.g. "//foo(bar)" which means empty name.
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if (toolchain_separator > path_separator) {
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name_piece = base::StringPiece(
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&input_str[path_separator + 1],
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toolchain_separator - path_separator - 1);
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}
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// Toolchain name should end in a ) and this should be the end of the
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// string.
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if (input[input.size() - 1] != ')') {
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*err = Err(original_value, "Bad toolchain name.",
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"Toolchain name must end in a \")\" at the end of the label.");
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return false;
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}
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// Subtract off the two parens to just get the toolchain name.
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toolchain_piece = base::StringPiece(
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&input_str[toolchain_separator + 1],
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input.size() - toolchain_separator - 2);
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}
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}
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// Everything before the separator is the filename.
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// We allow three cases:
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// Absolute: "//foo:bar" -> /foo:bar
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// Target in current file: ":foo" -> <currentdir>:foo
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// Path with implicit name: "/foo" -> /foo:foo
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if (location_piece.empty() && name_piece.empty()) {
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// Can't use both implicit filename and name (":").
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*err = Err(original_value, "This doesn't specify a dependency.");
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return false;
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}
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if (!ComputeBuildLocationFromDep(original_value, current_dir, location_piece,
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out_dir, err))
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return false;
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if (!ComputeTargetNameFromDep(original_value, *out_dir, name_piece,
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out_name, err))
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return false;
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// Last, do the toolchains.
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if (out_toolchain_dir) {
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// Handle empty toolchain strings. We don't allow normal labels to be
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// empty so we can't allow the recursive call of this function to do this
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// check.
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if (toolchain_piece.empty()) {
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*out_toolchain_dir = current_toolchain.dir();
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*out_toolchain_name = current_toolchain.name();
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return true;
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} else {
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return Resolve(current_dir, current_toolchain,
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original_value, toolchain_piece,
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out_toolchain_dir, out_toolchain_name, NULL, NULL, err);
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}
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}
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return true;
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}
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} // namespace
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Label::Label() {
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}
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Label::Label(const SourceDir& dir,
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const base::StringPiece& name,
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const SourceDir& toolchain_dir,
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const base::StringPiece& toolchain_name)
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: dir_(dir),
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toolchain_dir_(toolchain_dir) {
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name_.assign(name.data(), name.size());
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toolchain_name_.assign(toolchain_name.data(), toolchain_name.size());
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}
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Label::~Label() {
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}
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// static
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Label Label::Resolve(const SourceDir& current_dir,
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const Label& current_toolchain,
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const Value& input,
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Err* err) {
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Label ret;
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if (input.type() != Value::STRING) {
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*err = Err(input, "Dependency is not a string.");
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return ret;
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}
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const std::string& input_string = input.string_value();
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if (input_string.empty()) {
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*err = Err(input, "Dependency string is empty.");
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return ret;
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}
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if (!::Resolve(current_dir, current_toolchain, input, input_string,
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&ret.dir_, &ret.name_,
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&ret.toolchain_dir_, &ret.toolchain_name_,
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err))
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return Label();
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return ret;
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}
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Label Label::GetToolchainLabel() const {
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return Label(toolchain_dir_, toolchain_name_,
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SourceDir(), base::StringPiece());
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}
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std::string Label::GetUserVisibleName(bool include_toolchain) const {
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std::string ret;
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ret.reserve(dir_.value().size() + name_.size() + 1);
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if (dir_.is_null())
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return ret;
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ret = DirWithNoTrailingSlash(dir_);
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ret.push_back(':');
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ret.append(name_);
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if (include_toolchain) {
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ret.push_back('(');
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if (!toolchain_dir_.is_null() && !toolchain_name_.empty()) {
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ret.append(DirWithNoTrailingSlash(toolchain_dir_));
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ret.push_back(':');
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ret.append(toolchain_name_);
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}
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ret.push_back(')');
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}
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return ret;
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}
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std::string Label::GetUserVisibleName(const Label& default_toolchain) const {
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bool include_toolchain =
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default_toolchain.dir() != toolchain_dir_ ||
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default_toolchain.name() != toolchain_name_;
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return GetUserVisibleName(include_toolchain);
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}
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