SkRTConf: eliminate

src/utils/SkRTConf.cpp

-/*
- * 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;
-}