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//===--------------------- StringLexer.cpp -----------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/Utility/StringLexer.h"
#include <algorithm>
#include <assert.h>
using namespace lldb_utility;
StringLexer::StringLexer (std::string s) :
m_data(s),
m_position(0)
{ }
StringLexer::StringLexer (const StringLexer& rhs) :
m_data(rhs.m_data),
m_position(rhs.m_position)
{ }
StringLexer::Character
StringLexer::Peek ()
{
return m_data[m_position];
}
bool
StringLexer::NextIf (Character c)
{
auto val = Peek();
if (val == c)
{
Next();
return true;
}
return false;
}
std::pair<bool, StringLexer::Character>
StringLexer::NextIf (std::initializer_list<Character> cs)
{
auto val = Peek();
for (auto c : cs)
{
if (val == c)
{
Next();
return {true,c};
}
}
return {false,0};
}
bool
StringLexer::AdvanceIf (const std::string& token)
{
auto pos = m_position;
bool matches = true;
for (auto c : token)
{
if (!NextIf(c))
{
matches = false;
break;
}
}
if (!matches)
{
m_position = pos;
return false;
}
return true;
}
StringLexer::Character
StringLexer::Next ()
{
auto val = Peek();
Consume();
return val;
}
bool
StringLexer::HasAtLeast (Size s)
{
return (m_data.size() - m_position) >= s;
}
void
StringLexer::PutBack (Size s)
{
assert (m_position >= s);
m_position -= s;
}
bool
StringLexer::HasAny (Character c)
{
return m_data.find(c, m_position) != std::string::npos;
}
std::string
StringLexer::GetUnlexed ()
{
return std::string(m_data, m_position);
}
void
StringLexer::Consume()
{
m_position++;
}
StringLexer&
StringLexer::operator = (const StringLexer& rhs)
{
if (this != &rhs)
{
m_data = rhs.m_data;
m_position = rhs.m_position;
}
return *this;
}
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