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1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "tools/gn/build_settings.h" | |
6 #include "tools/gn/functions.h" | |
7 #include "tools/gn/parse_tree.h" | |
8 #include "tools/gn/path_output.h" | |
9 #include "tools/gn/scope.h" | |
10 #include "tools/gn/settings.h" | |
11 #include "tools/gn/source_dir.h" | |
12 #include "tools/gn/source_file.h" | |
13 #include "tools/gn/value.h" | |
14 | |
15 namespace functions { | |
16 | |
17 namespace { | |
18 | |
19 // Returns true if the given value looks like a directory, otherwise we'll | |
20 // assume it's a file. | |
21 bool ValueLooksLikeDir(const std::string& value) { | |
22 if (value.empty()) | |
23 return true; | |
24 size_t value_size = value.size(); | |
25 | |
26 // Count the number of dots at the end of the string. | |
27 size_t num_dots = 0; | |
28 while (num_dots < value_size && value[value_size - num_dots - 1] == '.') | |
29 num_dots++; | |
30 | |
31 if (num_dots == value.size()) | |
32 return true; // String is all dots. | |
33 | |
34 if (value[value_size - num_dots - 1] == '/' || | |
35 value[value_size - num_dots - 1] == '\\') | |
36 return true; // String is a [back]slash followed by 0 or more dots. | |
37 | |
38 // Anything else. | |
39 return false; | |
40 } | |
41 | |
42 Value ConvertOneBuildPath(const Scope* scope, | |
43 const FunctionCallNode* function, | |
44 const Value& value, | |
45 const PathOutput& path_output, | |
46 Err* err) { | |
47 if (!value.VerifyTypeIs(Value::STRING, err)) | |
48 return Value(); | |
49 | |
50 const std::string& string_value = value.string_value(); | |
51 | |
52 std::ostringstream buffer; | |
53 if (ValueLooksLikeDir(string_value)) { | |
54 SourceDir absolute = | |
55 scope->GetSourceDir().ResolveRelativeDir(string_value); | |
56 path_output.WriteDir(buffer, absolute, PathOutput::DIR_NO_LAST_SLASH); | |
57 } else { | |
58 SourceFile absolute = | |
59 scope->GetSourceDir().ResolveRelativeFile(string_value); | |
60 path_output.WriteFile(buffer, absolute); | |
61 } | |
62 return Value(function, buffer.str()); | |
63 } | |
64 | |
65 } // namespace | |
66 | |
67 const char kToBuildPath[] = "to_build_path"; | |
scottmg
2013/09/14 04:53:16
is this name from google3? i find it a bit confusi
brettw
2013/09/16 17:59:02
This is my own name. I agree the overlap of "build
| |
68 const char kToBuildPath_Help[] = | |
69 "to_build_path: Rebase a file or directory to the build output dir.\n" | |
70 "\n" | |
71 " <converted> = to_build_path(<file_or_path_string_or_list>)\n" | |
72 "\n" | |
73 " Takes a string argument representing a file name, or a list of such\n" | |
74 " strings and converts it/them to be relative to the root build output\n" | |
75 " directory (which is the current directory when running scripts).\n" | |
76 "\n" | |
77 " The input can be:\n" | |
78 " - Paths relative to the BUILD file like \"foo.txt\".\n" | |
79 " - Source-root absolute paths like \"//foo/bar/foo.txt\".\n" | |
80 " - System absolute paths like \"/usr/include/foo.h\" or\n" | |
81 " \"/C:/foo/bar.h\" (these will be passed unchanged).\n" | |
82 " - A list of such values (the result will be a list of each item\n" | |
83 " converted as per the above description).\n" | |
84 "\n" | |
85 " Normally for sources and in cases where GN is providing file names\n" | |
86 " to a tool, the paths will automatically be converted to be relative\n" | |
87 " to the build directory. However, if you pass additional arguments,\n" | |
88 " GN won't know that the string is actually a file path. These will\n" | |
89 " need to be manually converted to be relative to the build dir using\n" | |
90 " to_build_path().\n" | |
91 "\n" | |
92 " Trailing slashes will not be reflected in the output.\n" | |
93 "\n" | |
94 " Additionally, on Windows, slashes will be converted to backslashes.\n" | |
95 "\n" | |
96 "Example:\n" | |
97 " custom(\"myscript\") {\n" | |
98 " # Don't use for sources, GN will automatically convert these since\n" | |
99 " # it knows they're files.\n" | |
100 " sources = [ \"foo.txt\", \"bar.txt\" ]\n" | |
scottmg
2013/09/14 04:53:16
this ended up very confusing in gyp, and there's s
brettw
2013/09/16 17:59:02
I think it's pretty clear here. Some things like s
| |
101 "\n" | |
102 " # Extra file args passed manually need to be explicitly converted:\n" | |
103 " args = [ \"--data\", to_build_path(\"//mything/data/input.dat\"),\n" | |
104 " \"--rel\", to_build_path(\"relative_path.txt\") ]\n" | |
105 " }\n"; | |
106 | |
107 Value RunToBuildPath(Scope* scope, | |
108 const FunctionCallNode* function, | |
109 const std::vector<Value>& args, | |
110 Err* err) { | |
111 if (args.size() != 1) { | |
112 *err = Err(function->function(), "to_build_path takes one argument."); | |
113 return Value(); | |
114 } | |
115 | |
116 const Value& value = args[0]; | |
117 PathOutput path_output(scope->settings()->build_settings()->build_dir(), | |
118 ESCAPE_NONE, true); | |
119 | |
120 if (value.type() == Value::STRING) { | |
121 return ConvertOneBuildPath(scope, function, value, path_output, err); | |
122 | |
123 } else if (value.type() == Value::LIST) { | |
124 Value ret(function, Value::LIST); | |
125 ret.list_value().reserve(value.list_value().size()); | |
126 | |
127 for (size_t i = 0; i < value.list_value().size(); i++) { | |
128 ret.list_value().push_back( | |
129 ConvertOneBuildPath(scope, function, value.list_value()[i], | |
130 path_output, err)); | |
131 } | |
132 return ret; | |
133 } | |
134 | |
135 *err = Err(function->function(), | |
136 "to_build_path requires a list or a string."); | |
137 return Value(); | |
138 } | |
139 | |
140 } // namespace functions | |
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