a7e9f05119
TBR=reed Moving to private is good. Review URL: https://codereview.chromium.org/1707213002
497 lines
19 KiB
C++
497 lines
19 KiB
C++
/*
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* Copyright 2013 Google Inc.
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*
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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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*/
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#ifndef SK_COMMAND_LINE_FLAGS_H
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#define SK_COMMAND_LINE_FLAGS_H
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#include "../private/SkTArray.h"
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#include "../private/SkTDArray.h"
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#include "SkString.h"
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/**
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* Including this file (and compiling SkCommandLineFlags.cpp) provides command line
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* parsing. In order to use it, use the following macros in global
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* namespace:
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*
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* DEFINE_bool(name, defaultValue, helpString);
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* DEFINE_string(name, defaultValue, helpString);
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* DEFINE_int32(name, defaultValue, helpString);
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* DEFINE_double(name, defaultValue, helpString);
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*
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* Then, in main, call SkCommandLineFlags::SetUsage() to describe usage and call
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* SkCommandLineFlags::Parse() to parse the flags. Henceforth, each flag can
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* be referenced using
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*
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* FLAGS_name
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*
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* For example, the line
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*
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* DEFINE_bool(boolean, false, "The variable boolean does such and such");
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*
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* will create the following variable:
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*
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* bool FLAGS_boolean;
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*
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* which will initially be set to false, and can be set to true by using the
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* flag "--boolean" on the commandline. "--noboolean" will set FLAGS_boolean
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* to false. FLAGS_boolean can also be set using "--boolean=true" or
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* "--boolean true" (where "true" can be replaced by "false", "TRUE", "FALSE",
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* "1" or "0").
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*
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* The helpString will be printed if the help flag (-h or -help) is used.
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*
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* Similarly, the line
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*
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* DEFINE_int32(integer, .., ..);
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*
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* will create
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*
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* int32_t FLAGS_integer;
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*
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* and
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*
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* DEFINE_double(real, .., ..);
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*
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* will create
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*
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* double FLAGS_real;
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*
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* These flags can be set by specifying, for example, "--integer 7" and
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* "--real 3.14" on the command line.
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*
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* Unlike the others, the line
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*
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* DEFINE_string(args, .., ..);
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*
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* creates an array:
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*
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* SkCommandLineFlags::StringArray FLAGS_args;
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*
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* If the default value is the empty string, FLAGS_args will default to a size
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* of zero. Otherwise it will default to a size of 1 with the default string
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* as its value. All strings that follow the flag on the command line (until
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* a string that begins with '-') will be entries in the array.
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*
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* DEFINE_extended_string(args, .., .., extendedHelpString);
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*
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* creates a similar string array flag as DEFINE_string. The flag will have extended help text
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* (extendedHelpString) that can the user can see with '--help <args>' flag.
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*
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* Any flag can be referenced from another file after using the following:
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*
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* DECLARE_x(name);
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*
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* (where 'x' is the type specified in the DEFINE).
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*
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* Inspired by gflags (https://code.google.com/p/gflags/). Is not quite as
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* robust as gflags, but suits our purposes. For example, allows creating
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* a flag -h or -help which will never be used, since SkCommandLineFlags handles it.
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* SkCommandLineFlags will also allow creating --flag and --noflag. Uses the same input
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* format as gflags and creates similarly named variables (i.e. FLAGS_name).
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* Strings are handled differently (resulting variable will be an array of
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* strings) so that a flag can be followed by multiple parameters.
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*/
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class SkFlagInfo;
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class SkCommandLineFlags {
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public:
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/**
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* Call to set the help message to be displayed. Should be called before
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* Parse.
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*/
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static void SetUsage(const char* usage);
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/**
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* Call this to display the help message. Should be called after SetUsage.
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*/
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static void PrintUsage();
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/**
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* Call at the beginning of main to parse flags created by DEFINE_x, above.
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* Must only be called once.
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*/
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static void Parse(int argc, char** argv);
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/**
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* Custom class for holding the arguments for a string flag.
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* Publicly only has accessors so the strings cannot be modified.
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*/
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class StringArray {
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public:
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StringArray() { }
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explicit StringArray(const SkTArray<SkString>& strings)
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: fStrings(strings) {
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}
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const char* operator[](int i) const {
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SkASSERT(i >= 0 && i < fStrings.count());
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return fStrings[i].c_str();
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}
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int count() const {
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return fStrings.count();
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}
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bool isEmpty() const { return this->count() == 0; }
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/**
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* Returns true iff string is equal to one of the strings in this array.
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*/
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bool contains(const char* string) const {
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for (int i = 0; i < fStrings.count(); i++) {
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if (fStrings[i].equals(string)) {
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return true;
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}
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}
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return false;
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}
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void set(int i, const char* str) {
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fStrings[i].set(str);
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}
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private:
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void reset() { fStrings.reset(); }
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void append(const char* string) {
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fStrings.push_back().set(string);
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}
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void append(const char* string, size_t length) {
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fStrings.push_back().set(string, length);
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}
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SkTArray<SkString> fStrings;
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friend class SkFlagInfo;
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};
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/* Takes a list of the form [~][^]match[$]
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~ causes a matching test to always be skipped
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^ requires the start of the test to match
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$ requires the end of the test to match
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^ and $ requires an exact match
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If a test does not match any list entry, it is skipped unless some list entry starts with ~
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*/
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static bool ShouldSkip(const SkTDArray<const char*>& strings, const char* name);
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static bool ShouldSkip(const StringArray& strings, const char* name);
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private:
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static SkFlagInfo* gHead;
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static SkString gUsage;
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// For access to gHead.
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friend class SkFlagInfo;
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};
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#define TO_STRING2(s) #s
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#define TO_STRING(s) TO_STRING2(s)
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#define DEFINE_bool(name, defaultValue, helpString) \
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bool FLAGS_##name; \
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SK_UNUSED static bool unused_##name = SkFlagInfo::CreateBoolFlag(TO_STRING(name), \
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nullptr, \
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&FLAGS_##name, \
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defaultValue, \
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helpString)
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// bool 2 allows specifying a short name. No check is done to ensure that shortName
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// is actually shorter than name.
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#define DEFINE_bool2(name, shortName, defaultValue, helpString) \
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bool FLAGS_##name; \
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SK_UNUSED static bool unused_##name = SkFlagInfo::CreateBoolFlag(TO_STRING(name), \
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TO_STRING(shortName),\
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&FLAGS_##name, \
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defaultValue, \
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helpString)
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#define DECLARE_bool(name) extern bool FLAGS_##name;
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#define DEFINE_string(name, defaultValue, helpString) \
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SkCommandLineFlags::StringArray FLAGS_##name; \
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SK_UNUSED static bool unused_##name = SkFlagInfo::CreateStringFlag(TO_STRING(name), \
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nullptr, \
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&FLAGS_##name, \
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defaultValue, \
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helpString, nullptr)
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#define DEFINE_extended_string(name, defaultValue, helpString, extendedHelpString) \
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SkCommandLineFlags::StringArray FLAGS_##name; \
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SK_UNUSED static bool unused_##name = SkFlagInfo::CreateStringFlag(TO_STRING(name), \
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nullptr, \
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&FLAGS_##name, \
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defaultValue, \
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helpString, \
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extendedHelpString)
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// string2 allows specifying a short name. There is an assert that shortName
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// is only 1 character.
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#define DEFINE_string2(name, shortName, defaultValue, helpString) \
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SkCommandLineFlags::StringArray FLAGS_##name; \
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SK_UNUSED static bool unused_##name = SkFlagInfo::CreateStringFlag(TO_STRING(name), \
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TO_STRING(shortName), \
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&FLAGS_##name, \
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defaultValue, \
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helpString, nullptr)
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#define DECLARE_string(name) extern SkCommandLineFlags::StringArray FLAGS_##name;
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#define DEFINE_int32(name, defaultValue, helpString) \
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int32_t FLAGS_##name; \
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SK_UNUSED static bool unused_##name = SkFlagInfo::CreateIntFlag(TO_STRING(name), \
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&FLAGS_##name, \
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defaultValue, \
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helpString)
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#define DEFINE_int32_2(name, shortName, defaultValue, helpString) \
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int32_t FLAGS_##name; \
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SK_UNUSED static bool unused_##name = SkFlagInfo::CreateIntFlag(TO_STRING(name), \
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TO_STRING(shortName), \
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&FLAGS_##name, \
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defaultValue, \
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helpString)
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#define DECLARE_int32(name) extern int32_t FLAGS_##name;
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#define DEFINE_double(name, defaultValue, helpString) \
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double FLAGS_##name; \
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SK_UNUSED static bool unused_##name = SkFlagInfo::CreateDoubleFlag(TO_STRING(name), \
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&FLAGS_##name, \
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defaultValue, \
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helpString)
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#define DECLARE_double(name) extern double FLAGS_##name;
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class SkFlagInfo {
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public:
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enum FlagTypes {
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kBool_FlagType,
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kString_FlagType,
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kInt_FlagType,
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kDouble_FlagType,
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};
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/**
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* Each Create<Type>Flag function creates an SkFlagInfo of the specified type. The SkFlagInfo
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* object is appended to a list, which is deleted when SkCommandLineFlags::Parse is called.
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* Therefore, each call should be made before the call to ::Parse. They are not intended
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* to be called directly. Instead, use the macros described above.
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* @param name Long version (at least 2 characters) of the name of the flag. This name can
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* be referenced on the command line as "--name" to set the value of this flag.
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* @param shortName Short version (one character) of the name of the flag. This name can
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* be referenced on the command line as "-shortName" to set the value of this flag.
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* @param p<Type> Pointer to a global variable which holds the value set by SkCommandLineFlags.
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* @param defaultValue The default value of this flag. The variable pointed to by p<Type> will
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* be set to this value initially. This is also displayed as part of the help output.
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* @param helpString Explanation of what this flag changes in the program.
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*/
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static bool CreateBoolFlag(const char* name, const char* shortName, bool* pBool,
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bool defaultValue, const char* helpString) {
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SkFlagInfo* info = new SkFlagInfo(name, shortName, kBool_FlagType, helpString, nullptr);
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info->fBoolValue = pBool;
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*info->fBoolValue = info->fDefaultBool = defaultValue;
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return true;
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}
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/**
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* See comments for CreateBoolFlag.
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* @param pStrings Unlike the others, this is a pointer to an array of values.
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* @param defaultValue Thise default will be parsed so that strings separated by spaces
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* will be added to pStrings.
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*/
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static bool CreateStringFlag(const char* name, const char* shortName,
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SkCommandLineFlags::StringArray* pStrings,
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const char* defaultValue, const char* helpString,
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const char* extendedHelpString);
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/**
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* See comments for CreateBoolFlag.
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*/
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static bool CreateIntFlag(const char* name, int32_t* pInt,
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int32_t defaultValue, const char* helpString) {
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SkFlagInfo* info = new SkFlagInfo(name, nullptr, kInt_FlagType, helpString, nullptr);
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info->fIntValue = pInt;
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*info->fIntValue = info->fDefaultInt = defaultValue;
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return true;
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}
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static bool CreateIntFlag(const char* name, const char* shortName, int32_t* pInt,
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int32_t defaultValue, const char* helpString) {
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SkFlagInfo* info = new SkFlagInfo(name, shortName, kInt_FlagType, helpString, nullptr);
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info->fIntValue = pInt;
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*info->fIntValue = info->fDefaultInt = defaultValue;
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return true;
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}
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/**
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* See comments for CreateBoolFlag.
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*/
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static bool CreateDoubleFlag(const char* name, double* pDouble,
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double defaultValue, const char* helpString) {
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SkFlagInfo* info = new SkFlagInfo(name, nullptr, kDouble_FlagType, helpString, nullptr);
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info->fDoubleValue = pDouble;
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*info->fDoubleValue = info->fDefaultDouble = defaultValue;
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return true;
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}
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/**
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* Returns true if the string matches this flag.
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* For a boolean flag, also sets the value, since a boolean flag can be set in a number of ways
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* without looking at the following string:
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* --name
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* --noname
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* --name=true
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* --name=false
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* --name=1
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* --name=0
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* --name=TRUE
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* --name=FALSE
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*/
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bool match(const char* string);
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FlagTypes getFlagType() const { return fFlagType; }
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void resetStrings() {
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if (kString_FlagType == fFlagType) {
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fStrings->reset();
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} else {
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SkDEBUGFAIL("Can only call resetStrings on kString_FlagType");
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}
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}
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void append(const char* string) {
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if (kString_FlagType == fFlagType) {
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fStrings->append(string);
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} else {
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SkDEBUGFAIL("Can only append to kString_FlagType");
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}
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}
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void setInt(int32_t value) {
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if (kInt_FlagType == fFlagType) {
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*fIntValue = value;
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} else {
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SkDEBUGFAIL("Can only call setInt on kInt_FlagType");
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}
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}
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void setDouble(double value) {
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if (kDouble_FlagType == fFlagType) {
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*fDoubleValue = value;
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} else {
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SkDEBUGFAIL("Can only call setDouble on kDouble_FlagType");
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}
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}
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void setBool(bool value) {
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if (kBool_FlagType == fFlagType) {
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*fBoolValue = value;
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} else {
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SkDEBUGFAIL("Can only call setBool on kBool_FlagType");
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}
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}
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SkFlagInfo* next() { return fNext; }
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const SkString& name() const { return fName; }
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const SkString& shortName() const { return fShortName; }
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const SkString& help() const { return fHelpString; }
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const SkString& extendedHelp() const { return fExtendedHelpString; }
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SkString defaultValue() const {
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SkString result;
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switch (fFlagType) {
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case SkFlagInfo::kBool_FlagType:
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result.printf("%s", fDefaultBool ? "true" : "false");
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break;
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case SkFlagInfo::kString_FlagType:
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return fDefaultString;
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case SkFlagInfo::kInt_FlagType:
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result.printf("%i", fDefaultInt);
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break;
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case SkFlagInfo::kDouble_FlagType:
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result.printf("%2.2f", fDefaultDouble);
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break;
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default:
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SkDEBUGFAIL("Invalid flag type");
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}
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return result;
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}
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SkString typeAsString() const {
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switch (fFlagType) {
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case SkFlagInfo::kBool_FlagType:
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return SkString("bool");
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case SkFlagInfo::kString_FlagType:
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return SkString("string");
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case SkFlagInfo::kInt_FlagType:
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return SkString("int");
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case SkFlagInfo::kDouble_FlagType:
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return SkString("double");
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default:
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SkDEBUGFAIL("Invalid flag type");
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return SkString();
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}
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}
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private:
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SkFlagInfo(const char* name, const char* shortName, FlagTypes type, const char* helpString,
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const char* extendedHelpString)
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: fName(name)
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, fShortName(shortName)
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, fFlagType(type)
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, fHelpString(helpString)
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, fExtendedHelpString(extendedHelpString)
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, fBoolValue(nullptr)
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, fDefaultBool(false)
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, fIntValue(nullptr)
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, fDefaultInt(0)
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, fDoubleValue(nullptr)
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, fDefaultDouble(0)
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, fStrings(nullptr) {
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fNext = SkCommandLineFlags::gHead;
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SkCommandLineFlags::gHead = this;
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SkASSERT(name && strlen(name) > 1);
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SkASSERT(nullptr == shortName || 1 == strlen(shortName));
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}
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/**
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* Set a StringArray to hold the values stored in defaultStrings.
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* @param array The StringArray to modify.
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* @param defaultStrings Space separated list of strings that should be inserted into array
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* individually.
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*/
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static void SetDefaultStrings(SkCommandLineFlags::StringArray* array,
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const char* defaultStrings);
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// Name of the flag, without initial dashes
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SkString fName;
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SkString fShortName;
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FlagTypes fFlagType;
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SkString fHelpString;
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SkString fExtendedHelpString;
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bool* fBoolValue;
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bool fDefaultBool;
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int32_t* fIntValue;
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int32_t fDefaultInt;
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double* fDoubleValue;
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double fDefaultDouble;
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SkCommandLineFlags::StringArray* fStrings;
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// Both for the help string and in case fStrings is empty.
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SkString fDefaultString;
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// In order to keep a linked list.
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SkFlagInfo* fNext;
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};
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#endif // SK_COMMAND_LINE_FLAGS_H
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