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/*
* 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 "SkFlags.h"
SkFlagInfo* SkFlags::gHead;
SkString SkFlags::gUsage;
void SkFlags::SetUsage(const char* usage) {
gUsage.set(usage);
}
// Maximum line length for the help message.
#define LINE_LENGTH 80
static void print_help_for_flag(const SkFlagInfo* flag) {
SkDebugf("\t--%s", flag->name().c_str());
const SkString& shortName = flag->shortName();
if (shortName.size() > 0) {
SkDebugf(" or -%s", shortName.c_str());
}
SkDebugf(":\ttype: %s", flag->typeAsString().c_str());
if (flag->defaultValue().size() > 0) {
SkDebugf("\tdefault: %s", flag->defaultValue().c_str());
}
SkDebugf("\n");
const SkString& help = flag->help();
size_t length = help.size();
const char* currLine = help.c_str();
const char* stop = currLine + length;
while (currLine < stop) {
if (strlen(currLine) < LINE_LENGTH) {
// Only one line length's worth of text left.
SkDebugf("\t\t%s\n", currLine);
break;
}
int lineBreak = SkStrFind(currLine, "\n");
if (lineBreak < 0 || lineBreak > LINE_LENGTH) {
// No line break within line length. Will need to insert one.
// Find a space before the line break.
int spaceIndex = LINE_LENGTH - 1;
while (spaceIndex > 0 && currLine[spaceIndex] != ' ') {
spaceIndex--;
}
int gap;
if (0 == spaceIndex) {
// No spaces on the entire line. Go ahead and break mid word.
spaceIndex = LINE_LENGTH;
gap = 0;
} else {
// Skip the space on the next line
gap = 1;
}
SkDebugf("\t\t%.*s\n", spaceIndex, currLine);
currLine += spaceIndex + gap;
} else {
// the line break is within the limit. Break there.
lineBreak++;
SkDebugf("\t\t%.*s", lineBreak, currLine);
currLine += lineBreak;
}
}
SkDebugf("\n");
}
void SkFlags::ParseCommandLine(int argc, char** argv) {
// Only allow calling this function once.
static bool gOnce;
if (gOnce) {
SkDebugf("ParseCommandLine should only be called once at the beginning"
" of main!\n");
SkASSERT(false);
return;
}
gOnce = true;
bool helpPrinted = false;
// Loop over argv, starting with 1, since the first is just the name of the program.
for (int i = 1; i < argc; i++) {
if (0 == strcmp("-h", argv[i]) || 0 == strcmp("--h", argv[i])
|| 0 == strcmp("-help", argv[i]) || 0 == strcmp("--help", argv[i])) {
// Print help message.
SkTDArray<const char*> helpFlags;
for (int j = i + 1; j < argc; j++) {
if (SkStrStartsWith(argv[j], '-')) {
break;
}
helpFlags.append(1, &argv[j]);
}
if (0 == helpFlags.count()) {
// Only print general help message if help for specific flags is not requested.
SkDebugf("%s\n%s\n", argv[0], gUsage.c_str());
}
SkDebugf("Flags:\n");
SkFlagInfo* flag = SkFlags::gHead;
while (flag != NULL) {
// If no flags followed --help, print them all
bool printFlag = 0 == helpFlags.count();
if (!printFlag) {
for (int k = 0; k < helpFlags.count(); k++) {
if (flag->name().equals(helpFlags[k]) ||
flag->shortName().equals(helpFlags[k])) {
printFlag = true;
helpFlags.remove(k);
break;
}
}
}
if (printFlag) {
print_help_for_flag(flag);
}
flag = flag->next();
}
if (helpFlags.count() > 0) {
SkDebugf("Requested help for unrecognized flags:\n");
for (int k = 0; k < helpFlags.count(); k++) {
SkDebugf("\t--%s\n", helpFlags[k]);
}
}
helpPrinted = true;
}
if (!helpPrinted) {
bool flagMatched = false;
SkFlagInfo* flag = gHead;
while (flag != NULL) {
if (flag->match(argv[i])) {
flagMatched = true;
switch (flag->getFlagType()) {
case SkFlagInfo::kBool_FlagType:
// Handled by match, above
break;
case SkFlagInfo::kString_FlagType:
flag->resetStrings();
// Add all arguments until another flag is reached.
while (i+1 < argc && !SkStrStartsWith(argv[i+1], '-')) {
i++;
flag->append(argv[i]);
}
break;
case SkFlagInfo::kInt_FlagType:
i++;
flag->setInt(atoi(argv[i]));
break;
case SkFlagInfo::kDouble_FlagType:
i++;
flag->setDouble(atof(argv[i]));
break;
default:
SkASSERT(!"Invalid flag type");
}
break;
}
flag = flag->next();
}
if (!flagMatched) {
SkDebugf("skipping unknown flag %s\n", argv[i]);
}
}
}
// Since all of the flags have been set, release the memory used by each
// flag. FLAGS_x can still be used after this.
SkFlagInfo* flag = gHead;
gHead = NULL;
while (flag != NULL) {
SkFlagInfo* next = flag->next();
SkDELETE(flag);
flag = next;
}
if (helpPrinted) {
exit(0);
}
}
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