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PP: Non-functional: Make a proper class out of the atom <-> string mapping.

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This commit is contained in:
John Kessenich 2016-12-21 13:49:16 -07:00
parent 224b1f733b
commit f48faec3ee
6 changed files with 90 additions and 99 deletions
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59
glslang/MachineIndependent/preprocessor/PpAtom.cpp
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@ -149,62 +149,13 @@ const struct {
namespace glslang {
//
// Map an existing string to an atom.
//
// Return 0 if no existing string.
//
int TPpContext::LookUpString(const char* s)
{
auto it = atomMap.find(s);
return it == atomMap.end() ? 0 : it->second;
}
//
// Map a new or existing string to an atom, inventing a new atom if necessary.
//
int TPpContext::LookUpAddString(const char* s)
{
int atom = LookUpString(s);
if (atom == 0) {
atom = nextAtom++;
AddAtomFixed(s, atom);
}
return atom;
}
//
// Lookup up mapping of atom -> string.
//
const char* TPpContext::GetAtomString(int atom)
{
if ((size_t)atom >= stringMap.size())
return "<bad token>";
const TString* atomString = stringMap[atom];
return atomString ? atomString->c_str() : "<bad token>";
}
//
// Add mappings:
// - string -> atom
// - atom -> string
//
void TPpContext::AddAtomFixed(const char* s, int atom)
{
auto it = atomMap.insert(std::pair<TString, int>(s, atom)).first;
if (stringMap.size() < (size_t)atom + 1)
stringMap.resize(atom + 100, 0);
stringMap[atom] = &it->first;
}
//
// Initialize the atom table.
//
void TPpContext::InitAtomTable()
TStringAtomMap::TStringAtomMap()
{
badToken.assign("<bad token>");
// Add single character tokens to the atom table:
const char* s = "~!%^&*()-+=|,.<>/?;:[]{}#\\";
char t[2];
@ -212,13 +163,13 @@ void TPpContext::InitAtomTable()
t[1] = '\0';
while (*s) {
t[0] = *s;
AddAtomFixed(t, s[0]);
addAtomFixed(t, s[0]);
s++;
}
// Add multiple character scanner tokens :
for (size_t ii = 0; ii < sizeof(tokens)/sizeof(tokens[0]); ii++)
AddAtomFixed(tokens[ii].str, tokens[ii].val);
addAtomFixed(tokens[ii].str, tokens[ii].val);
nextAtom = PpAtomLast;
}