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