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[shared] StorageCartesianFunction: make first default names f, g, h, p

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This commit is contained in:
Émilie Feral
2018-10-12 15:33:36 +02:00
parent 1808629c30
commit bdef6cc85a
1 changed files with 16 additions and 9 deletions
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25
apps/shared/storage_cartesian_function.cpp
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@@ -11,25 +11,32 @@ using namespace Poincare;
namespace Shared {
void StorageCartesianFunction::DefaultName(char buffer[], size_t bufferSize) {
/* a default name is "f[number]", for instance "f12", that does not
* exist yet in the storage */
constexpr int k_maxNumberOfDefaultLetterNames = 4;
static constexpr const char k_defaultLetterNames[k_maxNumberOfDefaultLetterNames] = {
'f', 'g', 'h', 'p'
};
/* First default names are f, g, h, p and then f0, f1... ie, "f[number]",
* for instance "f12", that does not exist yet in the storage. */
size_t constantNameLength = 1; // 'f', no null-terminating char
assert(bufferSize > constantNameLength+1);
// Write the f
buffer[0] = 'f';
// Find the next available number
int currentNumber = 0;
int currentNumberLength = -1;
// Find the next available name
int currentNumber = -k_maxNumberOfDefaultLetterNames;
int currentNumberLength = 0;
int availableBufferSize = bufferSize - constantNameLength;
while (currentNumberLength < availableBufferSize) {
currentNumberLength = Poincare::Integer(currentNumber).serialize(&buffer[1], availableBufferSize);
// Choose letter
buffer[0] = currentNumber < 0 ? k_defaultLetterNames[k_maxNumberOfDefaultLetterNames+currentNumber] : k_defaultLetterNames[0];
// Choose number if required
if (currentNumber >= 0) {
currentNumberLength = Poincare::Integer(currentNumber).serialize(&buffer[1], availableBufferSize);
}
if (GlobalContext::SymbolAbstractNameIsFree(buffer)) {
// Name found
break;
}
currentNumber++;
}
assert(currentNumberLength > 0 && currentNumberLength < availableBufferSize);
assert(currentNumberLength >= 0 && currentNumberLength < availableBufferSize);
buffer[constantNameLength+currentNumberLength] = 0;
}