// Copyright Keysight Technologies 2012-2019
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, you can obtain one at http://mozilla.org/MPL/2.0/.
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using System.Collections.Generic;
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namespace OpenTap
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{
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internal enum LicenseToken
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{
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EOF,
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Error,
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LParan, RParan,
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Identifier,
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Process,
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And,
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Or
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}
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internal class TokenEntry
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{
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public LicenseToken Token;
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public int Position;
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public int Length;
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public string Text;
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public TokenEntry(LicenseToken token, string tokenStr, int position)
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{
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Token = token;
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Text = tokenStr;
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Position = position;
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Length = tokenStr.Length;
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}
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public TokenEntry(LicenseToken token, string tokenStr, int position, int length)
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{
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Token = token;
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Text = tokenStr;
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Position = position;
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Length = length;
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}
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}
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internal class Scanner
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{
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string Str;
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int idx = -1;
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char ch = '\0';
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bool EOF { get { return idx >= Str.Length; } }
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public List<TokenEntry> Tokens { get; private set; }
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private void AddToken(LicenseToken Token, string TokenStr = "", int Position = -1, int EndPosition = -1)
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{
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if (EndPosition >= 0)
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Tokens.Add(new TokenEntry(Token, TokenStr, Position, EndPosition - Position));
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else
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Tokens.Add(new TokenEntry(Token, TokenStr, Position));
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}
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private void GetChar()
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{
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idx++;
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if (EOF)
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{
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ch = '\0';
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return;
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}
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else
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ch = Str[idx];
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}
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private void Trim()
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{
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while ((!EOF) && ((int)ch <= 32))
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{
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if (EOF) return;
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GetChar();
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}
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}
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private void Tokenize()
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{
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while (!EOF)
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{
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Trim();
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if (EOF) break;
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int StartIndex = idx;
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if (ch == '(')
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{
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AddToken(LicenseToken.LParan, "(", StartIndex);
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GetChar();
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}
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else if (ch == ')')
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{
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AddToken(LicenseToken.RParan, ")", StartIndex);
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GetChar();
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}
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else if (ch == '&')
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{
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AddToken(LicenseToken.And, "&", StartIndex);
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GetChar();
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}
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else if (ch == '|')
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{
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AddToken(LicenseToken.Or, "|", StartIndex);
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GetChar();
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}
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else if (ch == '"')
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{
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string st = "";
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GetChar();
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while (ch != '"')
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{
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if (EOF)
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{
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Error("String exceeded end of line");
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break;
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}
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st += ch;
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GetChar();
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}
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AddToken(LicenseToken.Identifier, st, StartIndex, idx);
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GetChar();
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}
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else if (ch == '{')
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{
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string st = "";
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GetChar();
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while (ch != '}')
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{
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if (EOF)
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{
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Error("String exceeded end of line");
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break;
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}
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st += ch;
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GetChar();
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}
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AddToken(LicenseToken.Process, st, StartIndex, idx);
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GetChar();
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}
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else if (char.IsLetterOrDigit(ch))
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{
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string st = "";
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while ((char.IsLetterOrDigit(ch) || (ch=='_') || (ch == '-')) && !EOF)
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{
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st += ch;
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GetChar();
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}
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AddToken(LicenseToken.Identifier, st, StartIndex);
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}
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else
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{
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Error("Cannot parse expression");
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GetChar();
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}
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}
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}
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private void Error(string v)
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{
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AddToken(LicenseToken.Error, v);
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}
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public Scanner(string Input)
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{
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Tokens = new List<TokenEntry>();
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Str = Input;
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GetChar();
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Tokenize();
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}
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}
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}
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