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/*
* Copyright (c) 2020, Hüseyin Aslıtürk <asliturk@hotmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "INILexer.h"
#include <AK/CharacterTypes.h>
#include <AK/Vector.h>
namespace GUI {
IniLexer::IniLexer(StringView const& input)
: m_input(input)
{
}
char IniLexer::peek(size_t offset) const
{
if ((m_index + offset) >= m_input.length())
return 0;
return m_input[m_index + offset];
}
char IniLexer::consume()
{
VERIFY(m_index < m_input.length());
char ch = m_input[m_index++];
if (ch == '\n') {
m_position.line++;
m_position.column = 0;
} else {
m_position.column++;
}
return ch;
}
Vector<IniToken> IniLexer::lex()
{
Vector<IniToken> tokens;
size_t token_start_index = 0;
IniPosition token_start_position;
auto emit_token = [&](auto type) {
IniToken token;
token.m_type = type;
token.m_start = m_position;
consume();
token.m_end = m_position;
tokens.append(token);
};
auto begin_token = [&] {
token_start_index = m_index;
token_start_position = m_position;
};
auto commit_token = [&](auto type) {
IniToken token;
token.m_type = type;
token.m_start = token_start_position;
token.m_end = m_position;
tokens.append(token);
};
while (m_index < m_input.length()) {
auto ch = peek();
if (is_ascii_space(ch)) {
begin_token();
while (is_ascii_space(peek()))
consume();
commit_token(IniToken::Type::Whitespace);
continue;
}
// ;Comment
if (ch == ';') {
begin_token();
while (peek() && peek() != '\n')
consume();
commit_token(IniToken::Type::Comment);
continue;
}
// [Section]
if (ch == '[') {
// [ Token
begin_token();
consume();
commit_token(IniToken::Type::LeftBracket);
// Section
begin_token();
while (peek() && !(peek() == ']' || peek() == '\n'))
consume();
commit_token(IniToken::Type::section);
// ] Token
if (peek() && peek() == ']') {
begin_token();
consume();
commit_token(IniToken::Type::RightBracket);
}
continue;
}
// Empty Line
if (ch == '\n') {
consume();
emit_token(IniToken::Type::Unknown);
continue;
}
// Name=Value
begin_token();
while (peek() && !(peek() == '=' || peek() == '\n'))
consume();
commit_token(IniToken::Type::Name);
if (peek() && peek() == '=') {
begin_token();
consume();
commit_token(IniToken::Type::Equal);
}
if (peek()) {
begin_token();
while (peek() && peek() != '\n')
consume();
commit_token(IniToken::Type::Value);
}
}
return tokens;
}
}
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