mirror of
https://git.do.srb2.org/STJr/UltimateZoneBuilder.git
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353 lines
8.9 KiB
C#
353 lines
8.9 KiB
C#
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#region ================== Copyright (c) 2007 Pascal vd Heiden
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/*
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* Copyright (c) 2007 Pascal vd Heiden, www.codeimp.com
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* This program is released under GNU General Public License
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#endregion
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#region ================== Namespaces
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using System.Globalization;
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using System.Text;
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using System.IO;
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#endregion
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namespace CodeImp.DoomBuilder.ZDoom
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{
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public abstract class ZDTextParser
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{
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#region ================== Constants
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#endregion
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#region ================== Variables
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// Parsing
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protected string whitespace = "\n \t\r\u00A0"; //mxd. non-breaking space is also space :)
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protected string specialtokens = ":{}+-\n;";
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// Input data stream
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protected Stream datastream;
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protected BinaryReader datareader;
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protected string sourcename;
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// Error report
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private int errorline;
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private string errordesc;
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private string errorsource;
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#endregion
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#region ================== Properties
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internal Stream DataStream { get { return datastream; } }
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internal BinaryReader DataReader { get { return datareader; } }
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public int ErrorLine { get { return errorline; } }
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public string ErrorDescription { get { return errordesc; } }
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public string ErrorSource { get { return errorsource; } }
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public bool HasError { get { return (errordesc != null); } }
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#endregion
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#region ================== Constructor / Disposer
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// Constructor
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protected ZDTextParser()
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{
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// Initialize
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errordesc = null;
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}
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#endregion
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#region ================== Parsing
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// This parses the given decorate stream
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// Returns false on errors
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public virtual bool Parse(Stream stream, string sourcefilename)
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{
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datastream = stream;
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datareader = new BinaryReader(stream, Encoding.ASCII);
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sourcename = sourcefilename;
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datastream.Seek(0, SeekOrigin.Begin);
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return true;
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}
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// This returns true if the given character is whitespace
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protected internal bool IsWhitespace(char c)
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{
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return (whitespace.IndexOf(c) > -1);
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}
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// This returns true if the given character is a special token
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protected internal bool IsSpecialToken(char c)
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{
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return (specialtokens.IndexOf(c) > -1);
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}
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// This returns true if the given character is a special token
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protected internal bool IsSpecialToken(string s)
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{
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if(s.Length > 0)
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return (specialtokens.IndexOf(s[0]) > -1);
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else
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return false;
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}
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// This removes beginning and ending quotes from a token
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protected internal string StripTokenQuotes(string token)
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{
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// Remove first character, if it is a quote
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if(!string.IsNullOrEmpty(token) && (token[0] == '"'))
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token = token.Substring(1);
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// Remove last character, if it is a quote
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if(!string.IsNullOrEmpty(token) && (token[token.Length - 1] == '"'))
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token = token.Substring(0, token.Length - 1);
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return token;
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}
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// This skips whitespace on the stream, placing the read
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// position right before the first non-whitespace character
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// Returns false when the end of the stream is reached
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protected internal bool SkipWhitespace(bool skipnewline)
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{
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int offset = skipnewline ? 0 : 1;
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char c;
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do
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{
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if(datastream.Position == datastream.Length) return false;
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c = (char)datareader.ReadByte();
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// Check if this is comment
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if(c == '/')
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{
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if(datastream.Position == datastream.Length) return false;
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char c2 = (char)datareader.ReadByte();
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if(c2 == '/')
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{
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// Check if not a special comment with a token
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if(datastream.Position == datastream.Length) return false;
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char c3 = (char)datareader.ReadByte();
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if(c3 != '$')
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{
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// Skip entire line
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char c4 = ' ';
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while((c4 != '\n') && (datastream.Position < datastream.Length)) { c4 = (char)datareader.ReadByte(); }
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c = c4;
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}
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else
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{
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// Not a comment
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c = c3;
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}
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}
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else if(c2 == '*')
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{
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// Skip until */
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char c4, c3 = '\0';
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do
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{
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c4 = c3;
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c3 = (char)datareader.ReadByte();
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}
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while((c4 != '*') || (c3 != '/'));
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c = ' ';
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}
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else
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{
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// Not a comment, rewind from reading c2
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datastream.Seek(-1, SeekOrigin.Current);
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}
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}
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}
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while(whitespace.IndexOf(c, offset) > -1);
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// Go one character back so we can read this non-whitespace character again
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datastream.Seek(-1, SeekOrigin.Current);
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return true;
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}
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// This reads a token (all sequential non-whitespace characters or a single character)
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// Returns null when the end of the stream has been reached
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protected internal string ReadToken()
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{
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string token = "";
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bool quotedstring = false;
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// Return null when the end of the stream has been reached
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if(datastream.Position == datastream.Length) return null;
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// Start reading
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char c = (char)datareader.ReadByte();
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while(!IsWhitespace(c) || quotedstring || IsSpecialToken(c))
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{
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// Special token?
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if(!quotedstring && IsSpecialToken(c))
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{
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// Not reading a token yet?
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if(token.Length == 0)
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{
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// This is our whole token
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token += c;
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break;
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}
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else
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{
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// This is a new token and shouldn't be read now
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// Go one character back so we can read this token again
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datastream.Seek(-1, SeekOrigin.Current);
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break;
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}
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}
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else
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{
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// Quote?
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if(c == '"')
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{
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// Quote to end the string?
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if(quotedstring) quotedstring = false;
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// First character is a quote?
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if(token.Length == 0) quotedstring = true;
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token += c;
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}
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// Potential comment?
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else if((c == '/') && !quotedstring)
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{
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// Check the next byte
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if(datastream.Position == datastream.Length) return token;
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char c2 = (char)datareader.ReadByte();
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if((c2 == '/') || (c2 == '*'))
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{
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// This is a comment start, so the token ends here
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// Go two characters back so we can read this comment again
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datastream.Seek(-2, SeekOrigin.Current);
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break;
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}
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else
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{
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// Not a comment
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// Go one character back so we can read this char again
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datastream.Seek(-1, SeekOrigin.Current);
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token += c;
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}
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}
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else
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{
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token += c;
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}
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}
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// Next character
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if(datastream.Position < datastream.Length)
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c = (char)datareader.Read();
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else
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break;
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}
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return token;
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}
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// This reads the rest of the line
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// Returns null when the end of the stream has been reached
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protected internal string ReadLine()
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{
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string token = "";
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// Return null when the end of the stream has been reached
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if(datastream.Position == datastream.Length) return null;
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// Start reading
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char c = (char)datareader.ReadByte();
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while(c != '\n')
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{
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token += c;
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// Next character
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if(datastream.Position < datastream.Length)
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c = (char)datareader.Read();
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else
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break;
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}
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return token.Trim();
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}
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//mxd
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protected internal bool ReadSignedFloat(string token, ref float value) {
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int sign = 1;
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if (token == "-") {
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sign = -1;
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token = StripTokenQuotes(ReadToken());
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}
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float val;
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bool success = float.TryParse(token, NumberStyles.Float, CultureInfo.InvariantCulture, out val);
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if (success)
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value = val * sign;
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return success;
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}
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//mxd
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protected internal bool ReadSignedInt(string token, ref int value) {
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int sign = 1;
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if (token == "-") {
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sign = -1;
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token = StripTokenQuotes(ReadToken());
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}
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int val;
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bool success = int.TryParse(token, NumberStyles.Integer, CultureInfo.InvariantCulture, out val);
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if (success)
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value = val * sign;
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return success;
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}
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// This reports an error
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protected internal void ReportError(string message)
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{
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// Set error information
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errordesc = message;
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errorline = GetCurrentLineNumber();
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errorsource = sourcename;
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}
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//mxd
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protected internal int GetCurrentLineNumber() {
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long position = datastream.Position;
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long readpos = 0;
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int linenumber = 1;
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// Find the line on which we found this error
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datastream.Seek(0, SeekOrigin.Begin);
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StreamReader textreader = new StreamReader(datastream, Encoding.ASCII);
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while (readpos < position) {
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string line = textreader.ReadLine();
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if (line == null) break;
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readpos += line.Length + 2;
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linenumber++;
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}
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// Return to original position
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datastream.Seek(position, SeekOrigin.Begin);
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return linenumber;
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}
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#endregion
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}
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}
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