src/utils/SkRTConf.cpp - skia - Git at Google

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "SkRTConf.h"
 #include "SkOSFile.h"

 #include <stdlib.h>

 SkRTConfRegistry::SkRTConfRegistry(): fConfs(100) {

     FILE *fp = sk_fopen(configFileLocation(), kRead_SkFILE_Flag);

     if (!fp) {
         return;
     }

     char line[1024];

     while (!sk_feof(fp)) {

         if (!sk_fgets(line, sizeof(line), fp)) {
             break;
         }

         char *commentptr = strchr(line, '#');
         if (commentptr == line) {
             continue;
         }
         if (commentptr) {
             *commentptr = '\0';
         }

         char sep[] = " \t\r\n";

         char *keyptr = strtok(line, sep);
         if (!keyptr) {
             continue;
         }

         char *valptr = strtok(nullptr, sep);
         if (!valptr) {
             continue;
         }

         SkString *key = new SkString(keyptr);
         SkString *val = new SkString(valptr);

         fConfigFileKeys.append(1, &key);
         fConfigFileValues.append(1, &val);
     }
     sk_fclose(fp);
 }

 SkRTConfRegistry::~SkRTConfRegistry() {
     ConfMap::Iter iter(fConfs);
     SkTDArray<SkRTConfBase *> *confArray;

     while (iter.next(&confArray)) {
         delete confArray;
     }

     for (int i = 0 ; i < fConfigFileKeys.count() ; i++) {
         delete fConfigFileKeys[i];
         delete fConfigFileValues[i];
     }
 }

 const char *SkRTConfRegistry::configFileLocation() const {
     return "skia.conf"; // for now -- should probably do something fancier like home directories or whatever.
 }

 // dump all known runtime config options to the file with their default values.
 // to trigger this, make a config file of zero size.
 void SkRTConfRegistry::possiblyDumpFile() const {
     const char *path = configFileLocation();
     FILE *fp = sk_fopen(path, kRead_SkFILE_Flag);
     if (!fp) {
         return;
     }
     size_t configFileSize = sk_fgetsize(fp);
     if (configFileSize == 0) {
         printAll(path);
     }
     sk_fclose(fp);
 }

 // Run through every provided configuration option and print a warning if the user hasn't
 // declared a correponding configuration object somewhere.
 void SkRTConfRegistry::validate() const {
     for (int i = 0 ; i < fConfigFileKeys.count() ; i++) {
         if (!fConfs.find(fConfigFileKeys[i]->c_str())) {
             SkDebugf("WARNING: You have config value %s in your configuration file, but I've never heard of that.\n", fConfigFileKeys[i]->c_str());
         }
     }
 }

 void SkRTConfRegistry::printAll(const char *fname) const {
     SkWStream *o;

     if (fname) {
         o = new SkFILEWStream(fname);
     } else {
         o = new SkDebugWStream();
     }

     ConfMap::Iter iter(fConfs);
     SkTDArray<SkRTConfBase *> *confArray;

     while (iter.next(&confArray)) {
         if (confArray->getAt(0)->isDefault()) {
             o->writeText("# ");
         }
         confArray->getAt(0)->print(o);
         o->newline();
     }

     delete o;
 }

 bool SkRTConfRegistry::hasNonDefault() const {
     ConfMap::Iter iter(fConfs);
     SkTDArray<SkRTConfBase *> *confArray;
     while (iter.next(&confArray)) {
         if (!confArray->getAt(0)->isDefault()) {
             return true;
         }
     }
     return false;
 }

 void SkRTConfRegistry::printNonDefault(const char *fname) const {
     SkWStream *o;

     if (fname) {
         o = new SkFILEWStream(fname);
     } else {
         o = new SkDebugWStream();
     }
     ConfMap::Iter iter(fConfs);
     SkTDArray<SkRTConfBase *> *confArray;

     while (iter.next(&confArray)) {
         if (!confArray->getAt(0)->isDefault()) {
             confArray->getAt(0)->print(o);
             o->newline();
         }
     }

     delete o;
 }

 // register a configuration variable after its value has been set by the parser.
 // we maintain a vector of these things instead of just a single one because the
 // user might set the value after initialization time and we need to have
 // all the pointers lying around, not just one.
 void SkRTConfRegistry::registerConf(SkRTConfBase *conf) {
     SkTDArray<SkRTConfBase *> *confArray;
     if (fConfs.find(conf->getName(), &confArray)) {
         if (!conf->equals(confArray->getAt(0))) {
             SkDebugf("WARNING: Skia config \"%s\" was registered more than once in incompatible ways.\n", conf->getName());
         } else {
             confArray->append(1, &conf);
         }
     } else {
         confArray = new SkTDArray<SkRTConfBase *>;
         confArray->append(1, &conf);
         fConfs.set(conf->getName(),confArray);
     }
 }

 template <typename T> T doParse(const char *, bool *success ) {
     SkDebugf("WARNING: Invoked non-specialized doParse function...\n");
     if (success) {
         *success = false;
     }
     return (T) 0;
 }

 template<> bool doParse<bool>(const char *s, bool *success) {
     if (success) {
         *success = true;
     }
     if (!strcmp(s,"1") || !strcmp(s,"true")) {
         return true;
     }
     if (!strcmp(s,"0") || !strcmp(s,"false")) {
         return false;
     }
     if (success) {
         *success = false;
     }
     return false;
 }

 template<> const char * doParse<const char *>(const char * s, bool *success) {
     if (success) {
         *success = true;
     }
     return s;
 }

 template<> int doParse<int>(const char * s, bool *success) {
     if (success) {
         *success = true;
     }
     return atoi(s);
 }

 template<> unsigned int doParse<unsigned int>(const char * s, bool *success) {
     if (success) {
         *success = true;
     }
     return (unsigned int) atoi(s);
 }

 template<> float doParse<float>(const char * s, bool *success) {
     if (success) {
         *success = true;
     }
     return (float) atof(s);
 }

 template<> double doParse<double>(const char * s, bool *success) {
     if (success) {
         *success = true;
     }
     return atof(s);
 }

 static inline void str_replace(char *s, char search, char replace) {
     for (char *ptr = s ; *ptr ; ptr++) {
         if (*ptr == search) {
             *ptr = replace;
         }
     }
 }

 template<typename T> bool SkRTConfRegistry::parse(const char *name, T* value) {
     const char *str = nullptr;

     for (int i = fConfigFileKeys.count() - 1 ; i >= 0; i--) {
         if (fConfigFileKeys[i]->equals(name)) {
             str = fConfigFileValues[i]->c_str();
             break;
         }
     }

     SkString environment_variable("skia.");
     environment_variable.append(name);

     const char *environment_value = getenv(environment_variable.c_str());
     if (environment_value) {
         str = environment_value;
     } else {
         // apparently my shell doesn't let me have environment variables that
         // have periods in them, so also let the user substitute underscores.
         SkAutoTMalloc<char> underscore_name(SkStrDup(environment_variable.c_str()));
         str_replace(underscore_name.get(), '.', '_');
         environment_value = getenv(underscore_name.get());
         if (environment_value) {
             str = environment_value;
         }
     }

     if (!str) {
         return false;
     }

     bool success;
     T new_value = doParse<T>(str, &success);
     if (success) {
         *value = new_value;
     } else {
         SkDebugf("WARNING: Couldn't parse value \'%s\' for variable \'%s\'\n",
                  str, name);
     }
     return success;
 }

 // need to explicitly instantiate the parsing function for every config type we might have...

 template bool SkRTConfRegistry::parse(const char *name, bool *value);
 template bool SkRTConfRegistry::parse(const char *name, int *value);
 template bool SkRTConfRegistry::parse(const char *name, unsigned int *value);
 template bool SkRTConfRegistry::parse(const char *name, float *value);
 template bool SkRTConfRegistry::parse(const char *name, double *value);
 template bool SkRTConfRegistry::parse(const char *name, const char **value);

 template <typename T> void SkRTConfRegistry::set(const char *name,
                                                  T value,
                                                  bool warnIfNotFound) {
     SkTDArray<SkRTConfBase *> *confArray;
     if (!fConfs.find(name, &confArray)) {
         if (warnIfNotFound) {
             SkDebugf("WARNING: Attempting to set configuration value \"%s\","
                      " but I've never heard of that.\n", name);
         }
         return;
     }
     SkASSERT(confArray != nullptr);
     for (SkRTConfBase **confBase = confArray->begin(); confBase != confArray->end(); confBase++) {
         // static_cast here is okay because there's only one kind of child class.
         SkRTConf<T> *concrete = static_cast<SkRTConf<T> *>(*confBase);

         if (concrete) {
             concrete->set(value);
         }
     }
 }

 template void SkRTConfRegistry::set(const char *name, bool value, bool);
 template void SkRTConfRegistry::set(const char *name, int value, bool);
 template void SkRTConfRegistry::set(const char *name, unsigned int value, bool);
 template void SkRTConfRegistry::set(const char *name, float value, bool);
 template void SkRTConfRegistry::set(const char *name, double value, bool);
 template void SkRTConfRegistry::set(const char *name, char * value, bool);

 SkRTConfRegistry &skRTConfRegistry() {
     static SkRTConfRegistry r;
     return r;
 }
	/*
	* Copyright 2013 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "SkRTConf.h"
	#include "SkOSFile.h"

	#include <stdlib.h>

	SkRTConfRegistry::SkRTConfRegistry(): fConfs(100) {

	FILE *fp = sk_fopen(configFileLocation(), kRead_SkFILE_Flag);

	if (!fp) {
	return;
	}

	char line[1024];

	while (!sk_feof(fp)) {

	if (!sk_fgets(line, sizeof(line), fp)) {
	break;
	}

	char *commentptr = strchr(line, '#');
	if (commentptr == line) {
	continue;
	}
	if (commentptr) {
	*commentptr = '\0';
	}

	char sep[] = " \t\r\n";

	char *keyptr = strtok(line, sep);
	if (!keyptr) {
	continue;
	}

	char *valptr = strtok(nullptr, sep);
	if (!valptr) {
	continue;
	}

	SkString *key = new SkString(keyptr);
	SkString *val = new SkString(valptr);

	fConfigFileKeys.append(1, &key);
	fConfigFileValues.append(1, &val);
	}
	sk_fclose(fp);
	}

	SkRTConfRegistry::~SkRTConfRegistry() {
	ConfMap::Iter iter(fConfs);
	SkTDArray<SkRTConfBase > confArray;

	while (iter.next(&confArray)) {
	delete confArray;
	}

	for (int i = 0 ; i < fConfigFileKeys.count() ; i++) {
	delete fConfigFileKeys[i];
	delete fConfigFileValues[i];
	}
	}

	const char *SkRTConfRegistry::configFileLocation() const {
	return "skia.conf"; // for now -- should probably do something fancier like home directories or whatever.
	}

	// dump all known runtime config options to the file with their default values.
	// to trigger this, make a config file of zero size.
	void SkRTConfRegistry::possiblyDumpFile() const {
	const char *path = configFileLocation();
	FILE *fp = sk_fopen(path, kRead_SkFILE_Flag);
	if (!fp) {
	return;
	}
	size_t configFileSize = sk_fgetsize(fp);
	if (configFileSize == 0) {
	printAll(path);
	}
	sk_fclose(fp);
	}

	// Run through every provided configuration option and print a warning if the user hasn't
	// declared a correponding configuration object somewhere.
	void SkRTConfRegistry::validate() const {
	for (int i = 0 ; i < fConfigFileKeys.count() ; i++) {
	if (!fConfs.find(fConfigFileKeys[i]->c_str())) {
	SkDebugf("WARNING: You have config value %s in your configuration file, but I've never heard of that.\n", fConfigFileKeys[i]->c_str());
	}
	}
	}

	void SkRTConfRegistry::printAll(const char *fname) const {
	SkWStream *o;

	if (fname) {
	o = new SkFILEWStream(fname);
	} else {
	o = new SkDebugWStream();
	}

	ConfMap::Iter iter(fConfs);
	SkTDArray<SkRTConfBase > confArray;

	while (iter.next(&confArray)) {
	if (confArray->getAt(0)->isDefault()) {
	o->writeText("# ");
	}
	confArray->getAt(0)->print(o);
	o->newline();
	}

	delete o;
	}

	bool SkRTConfRegistry::hasNonDefault() const {
	ConfMap::Iter iter(fConfs);
	SkTDArray<SkRTConfBase > confArray;
	while (iter.next(&confArray)) {
	if (!confArray->getAt(0)->isDefault()) {
	return true;
	}
	}
	return false;
	}

	void SkRTConfRegistry::printNonDefault(const char *fname) const {
	SkWStream *o;

	if (fname) {
	o = new SkFILEWStream(fname);
	} else {
	o = new SkDebugWStream();
	}
	ConfMap::Iter iter(fConfs);
	SkTDArray<SkRTConfBase > confArray;

	while (iter.next(&confArray)) {
	if (!confArray->getAt(0)->isDefault()) {
	confArray->getAt(0)->print(o);
	o->newline();
	}
	}

	delete o;
	}

	// register a configuration variable after its value has been set by the parser.
	// we maintain a vector of these things instead of just a single one because the
	// user might set the value after initialization time and we need to have
	// all the pointers lying around, not just one.
	void SkRTConfRegistry::registerConf(SkRTConfBase *conf) {
	SkTDArray<SkRTConfBase > confArray;
	if (fConfs.find(conf->getName(), &confArray)) {
	if (!conf->equals(confArray->getAt(0))) {
	SkDebugf("WARNING: Skia config \"%s\" was registered more than once in incompatible ways.\n", conf->getName());
	} else {
	confArray->append(1, &conf);
	}
	} else {
	confArray = new SkTDArray<SkRTConfBase *>;
	confArray->append(1, &conf);
	fConfs.set(conf->getName(),confArray);
	}
	}

	template <typename T> T doParse(const char , bool success ) {
	SkDebugf("WARNING: Invoked non-specialized doParse function...\n");
	if (success) {
	*success = false;
	}
	return (T) 0;
	}

	template<> bool doParse<bool>(const char s, bool success) {
	if (success) {
	*success = true;
	}
	if (!strcmp(s,"1") \|\| !strcmp(s,"true")) {
	return true;
	}
	if (!strcmp(s,"0") \|\| !strcmp(s,"false")) {
	return false;
	}
	if (success) {
	*success = false;
	}
	return false;
	}

	template<> const char * doParse<const char >(const char s, bool *success) {
	if (success) {
	*success = true;
	}
	return s;
	}

	template<> int doParse<int>(const char * s, bool *success) {
	if (success) {
	*success = true;
	}
	return atoi(s);
	}

	template<> unsigned int doParse<unsigned int>(const char * s, bool *success) {
	if (success) {
	*success = true;
	}
	return (unsigned int) atoi(s);
	}

	template<> float doParse<float>(const char * s, bool *success) {
	if (success) {
	*success = true;
	}
	return (float) atof(s);
	}

	template<> double doParse<double>(const char * s, bool *success) {
	if (success) {
	*success = true;
	}
	return atof(s);
	}

	static inline void str_replace(char *s, char search, char replace) {
	for (char ptr = s ; ptr ; ptr++) {
	if (*ptr == search) {
	*ptr = replace;
	}
	}
	}

	template<typename T> bool SkRTConfRegistry::parse(const char name, T value) {
	const char *str = nullptr;

	for (int i = fConfigFileKeys.count() - 1 ; i >= 0; i--) {
	if (fConfigFileKeys[i]->equals(name)) {
	str = fConfigFileValues[i]->c_str();
	break;
	}
	}

	SkString environment_variable("skia.");
	environment_variable.append(name);

	const char *environment_value = getenv(environment_variable.c_str());
	if (environment_value) {
	str = environment_value;
	} else {
	// apparently my shell doesn't let me have environment variables that
	// have periods in them, so also let the user substitute underscores.
	SkAutoTMalloc<char> underscore_name(SkStrDup(environment_variable.c_str()));
	str_replace(underscore_name.get(), '.', '_');
	environment_value = getenv(underscore_name.get());
	if (environment_value) {
	str = environment_value;
	}
	}

	if (!str) {
	return false;
	}

	bool success;
	T new_value = doParse<T>(str, &success);
	if (success) {
	*value = new_value;
	} else {
	SkDebugf("WARNING: Couldn't parse value \'%s\' for variable \'%s\'\n",
	str, name);
	}
	return success;
	}

	// need to explicitly instantiate the parsing function for every config type we might have...

	template bool SkRTConfRegistry::parse(const char name, bool value);
	template bool SkRTConfRegistry::parse(const char name, int value);
	template bool SkRTConfRegistry::parse(const char name, unsigned int value);
	template bool SkRTConfRegistry::parse(const char name, float value);
	template bool SkRTConfRegistry::parse(const char name, double value);
	template bool SkRTConfRegistry::parse(const char name, const char *value);

	template <typename T> void SkRTConfRegistry::set(const char *name,
	T value,
	bool warnIfNotFound) {
	SkTDArray<SkRTConfBase > confArray;
	if (!fConfs.find(name, &confArray)) {
	if (warnIfNotFound) {
	SkDebugf("WARNING: Attempting to set configuration value \"%s\","
	" but I've never heard of that.\n", name);
	}
	return;
	}
	SkASSERT(confArray != nullptr);
	for (SkRTConfBase **confBase = confArray->begin(); confBase != confArray->end(); confBase++) {
	// static_cast here is okay because there's only one kind of child class.
	SkRTConf<T> concrete = static_cast<SkRTConf<T> >(*confBase);

	if (concrete) {
	concrete->set(value);
	}
	}
	}

	template void SkRTConfRegistry::set(const char *name, bool value, bool);
	template void SkRTConfRegistry::set(const char *name, int value, bool);
	template void SkRTConfRegistry::set(const char *name, unsigned int value, bool);
	template void SkRTConfRegistry::set(const char *name, float value, bool);
	template void SkRTConfRegistry::set(const char *name, double value, bool);
	template void SkRTConfRegistry::set(const char name, char value, bool);

	SkRTConfRegistry &skRTConfRegistry() {
	static SkRTConfRegistry r;
	return r;
	}