internal static MediaBlock ParseMediaDirective(ParserStream stream)
{
var start = stream.Position;
var media = new StringBuilder();
stream.ScanUntil(media, '{');
var mediaStr = media.ToString().Trim();
if (mediaStr.IsNullOrEmpty())
{
Current.RecordError(ErrorType.Parser, Position.Create(start, stream.Position, Current.CurrentFilePath), "Expected media list");
throw new StoppedParsingException();
}
var mediaQuery = MediaQueryParser.Parse(mediaStr, Position.Create(start, stream.Position, Current.CurrentFilePath));
var contained = new List <Block>();
char c;
while ((c = stream.Peek()) != '}')
{
if (char.IsWhiteSpace(c))
{
stream.AdvancePastWhiteSpace();
continue;
}
// More directive (probably)
if (c == '@')
{
contained.Add(ParseDirective(stream));
continue;
}
// Selector + block time!
contained.Add(ParseSelectorAndBlock(stream));
}
var notAllowed = contained.Where(x => !(x is SelectorAndBlock || x is MoreVariable));
foreach (var illegal in notAllowed)
{
Current.RecordError(ErrorType.Parser, illegal, "@media can only contain blocks and variable declarations");
}
if (notAllowed.Count() != 0)
{
throw new StoppedParsingException();
}
// Skip past }
stream.Advance();
return(new MediaBlock(mediaQuery, contained, start, stream.Position, Current.CurrentFilePath));
}
internal static List <Property> ParseCssRules(Selector selector, ParserStream stream)
{
var ret = new List <Property>();
while (stream.HasMore() && stream.Peek() != '}')
{
var c = stream.Peek();
if (char.IsWhiteSpace(c))
{
stream.AdvancePastWhiteSpace();
}
else
{
ret.Add(ParseRule(stream));
}
}
stream.AdvancePast("}");
return(ret);
}
public List <Block> Parse(string filePath, TextReader reader)
{
try
{
using (var stream = new ParserStream(reader))
{
Current.SwitchToFile(filePath);
var ret = new List <Block>();
while (stream.HasMore())
{
char c = stream.Peek();
//Ignore white space
if (char.IsWhiteSpace(c))
{
stream.AdvancePastWhiteSpace();
continue;
}
// More directive (probably)
if (c == '@')
{
ret.Add(ParseDirective(stream));
continue;
}
// Selector + block time!
ret.Add(ParseSelectorAndBlock(stream));
}
return(ret);
}
}
catch (StoppedParsingException)
{
return(null);
}
}
public List<Block> Parse(string filePath, TextReader reader)
{
try
{
using (var stream = new ParserStream(reader))
{
Current.SwitchToFile(filePath);
var ret = new List<Block>();
while (stream.HasMore())
{
char c = stream.Peek();
//Ignore white space
if (char.IsWhiteSpace(c))
{
stream.AdvancePastWhiteSpace();
continue;
}
// More directive (probably)
if (c == '@')
{
ret.Add(ParseDirective(stream));
continue;
}
// Selector + block time!
ret.Add(ParseSelectorAndBlock(stream));
}
return ret;
}
}
catch (StoppedParsingException)
{
return null;
}
}
internal static List <SpriteRule> ParseSpriteRules(ParserStream stream)
{
var ret = new List <SpriteRule>();
stream.AdvancePast("{");
while (stream.HasMore() && stream.Peek() != '}')
{
var c = stream.Peek();
if (char.IsWhiteSpace(c))
{
stream.AdvancePastWhiteSpace();
}
else
{
ret.Add(ParseSpriteRule(stream));
}
}
stream.AdvancePast("}");
return(ret);
}
internal static ResetBlock ParseResetDirective(ParserStream stream, int start)
{
var ignored = new StringBuilder();
stream.ScanUntil(ignored, '{');
var contained = new List <Block>();
char c;
while ((c = stream.Peek()) != '}')
{
if (char.IsWhiteSpace(c))
{
stream.AdvancePastWhiteSpace();
continue;
}
// More directive (probably)
if (c == '@')
{
contained.Add(ParseDirective(stream));
continue;
}
// Selector + block time!
contained.Add(ParseSelectorAndBlock(stream));
}
var notAllowed = contained.Where(x => !(x is SelectorAndBlock || x is MoreVariable));
foreach (var illegal in notAllowed)
{
Current.RecordError(ErrorType.Parser, illegal, "@reset can only contain blocks and variable declarations");
}
if (notAllowed.Count() != 0)
{
throw new StoppedParsingException();
}
// The whole @reset{} block disappears pretty quickly, but the actual
// blocks need to know what they were "near" for variable resolution.
var variables = contained.OfType <MoreVariable>();
var bound = new List <Block>();
foreach (var x in contained)
{
var asBlock = x as SelectorAndBlock;
if (asBlock != null)
{
bound.Add(asBlock.InReset(variables));
}
else
{
bound.Add(x);
}
}
// Skip past }
stream.Advance();
return(new ResetBlock(bound, start, stream.Position, Current.CurrentFilePath));
}
internal static KeyFramesBlock ParseKeyFramesDirective(string prefix, ParserStream stream, int start)
{
var buffer = new StringBuilder();
stream.ScanUntil(buffer, '{');
var name = buffer.ToString().Trim();
if (name.Length == 0)
{
Current.RecordError(ErrorType.Parser, Position.Create(start, stream.Position, Current.CurrentFilePath), "Expected a name for the keyframe animation");
throw new StoppedParsingException();
}
if ((name[0] != '-' && char.IsDigit(name[0])) ||
(name[0] == '-' && name.Length > 1 && char.IsDigit(name[1])) ||
name.Any(a => a != '-' && !char.IsLetterOrDigit(a)))
{
Current.RecordError(ErrorType.Parser, Position.Create(start, stream.Position, Current.CurrentFilePath), "Animation name `" + name + "` is not a valid identifier");
throw new StoppedParsingException();
}
var frames = new List <KeyFrame>();
var rules = new List <VariableProperty>();
while (stream.HasMore())
{
var c = stream.Peek();
if (char.IsWhiteSpace(c))
{
stream.AdvancePastWhiteSpace();
continue;
}
if (c == '}')
{
break;
}
if (c == '@')
{
var rule = ParseMixinOrVariableRule(stream);
if (!(rule is VariableProperty))
{
Current.RecordError(ErrorType.Parser, rule, "Expected variable declaration");
throw new StoppedParsingException();
}
rules.Add((VariableProperty)rule);
continue;
}
frames.Add(ParseKeyFrame(stream));
}
if (stream.Peek() != '}')
{
Current.RecordError(ErrorType.Parser, Position.Create(start, stream.Position, Current.CurrentFilePath), "Expected '}'");
throw new StoppedParsingException();
}
stream.Advance(); // Skip }
return(new KeyFramesBlock(prefix, name, frames, rules, start, stream.Position, Current.CurrentFilePath));
}
internal static ResetBlock ParseResetDirective(ParserStream stream, int start)
{
var ignored = new StringBuilder();
stream.ScanUntil(ignored, '{');
var contained = new List<Block>();
char c;
while ((c = stream.Peek()) != '}')
{
if (char.IsWhiteSpace(c))
{
stream.AdvancePastWhiteSpace();
continue;
}
// More directive (probably)
if (c == '@')
{
contained.Add(ParseDirective(stream));
continue;
}
// Selector + block time!
contained.Add(ParseSelectorAndBlock(stream));
}
var notAllowed = contained.Where(x => !(x is SelectorAndBlock || x is MoreVariable));
foreach (var illegal in notAllowed)
{
Current.RecordError(ErrorType.Parser, illegal, "@reset can only contain blocks and variable declarations");
}
if (notAllowed.Count() != 0)
{
throw new StoppedParsingException();
}
// The whole @reset{} block disappears pretty quickly, but the actual
// blocks need to know what they were "near" for variable resolution.
var variables = contained.OfType<MoreVariable>();
var bound = new List<Block>();
foreach (var x in contained)
{
var asBlock = x as SelectorAndBlock;
if (asBlock != null)
{
bound.Add(asBlock.InReset(variables));
}
else
{
bound.Add(x);
}
}
// Skip past }
stream.Advance();
return new ResetBlock(bound, start, stream.Position, Current.CurrentFilePath);
}
internal static MediaBlock ParseMediaDirective(ParserStream stream)
{
var start = stream.Position;
var media = new StringBuilder();
stream.ScanUntil(media, '{');
var mediaStr = media.ToString().Trim();
if (mediaStr.IsNullOrEmpty())
{
Current.RecordError(ErrorType.Parser, Position.Create(start, stream.Position, Current.CurrentFilePath), "Expected media list");
throw new StoppedParsingException();
}
var mediaQuery = MediaQueryParser.Parse(mediaStr, Position.Create(start, stream.Position, Current.CurrentFilePath));
var contained = new List<Block>();
char c;
while ((c = stream.Peek()) != '}')
{
if (char.IsWhiteSpace(c))
{
stream.AdvancePastWhiteSpace();
continue;
}
// More directive (probably)
if (c == '@')
{
contained.Add(ParseDirective(stream));
continue;
}
// Selector + block time!
contained.Add(ParseSelectorAndBlock(stream));
}
var notAllowed = contained.Where(x => !(x is SelectorAndBlock || x is MoreVariable));
foreach (var illegal in notAllowed)
{
Current.RecordError(ErrorType.Parser, illegal, "@media can only contain blocks and variable declarations");
}
if (notAllowed.Count() != 0)
{
throw new StoppedParsingException();
}
// Skip past }
stream.Advance();
return new MediaBlock(mediaQuery, contained, start, stream.Position, Current.CurrentFilePath);
}
internal static KeyFramesBlock ParseKeyFramesDirective(string prefix, ParserStream stream, int start)
{
var buffer = new StringBuilder();
stream.ScanUntil(buffer, '{');
var name = buffer.ToString().Trim();
if (name.Length == 0)
{
Current.RecordError(ErrorType.Parser, Position.Create(start, stream.Position, Current.CurrentFilePath), "Expected a name for the keyframe animation");
throw new StoppedParsingException();
}
if((name[0] != '-' && char.IsDigit(name[0])) ||
(name[0] == '-' && name.Length > 1 && char.IsDigit(name[1])) ||
name.Any(a => a != '-' && !char.IsLetterOrDigit(a)))
{
Current.RecordError(ErrorType.Parser, Position.Create(start, stream.Position, Current.CurrentFilePath), "Animation name `"+name+"` is not a valid identifier");
throw new StoppedParsingException();
}
var frames = new List<KeyFrame>();
var rules = new List<VariableProperty>();
while (stream.HasMore())
{
var c = stream.Peek();
if (char.IsWhiteSpace(c))
{
stream.AdvancePastWhiteSpace();
continue;
}
if (c == '}')
{
break;
}
if (c == '@')
{
var rule = ParseMixinOrVariableRule(stream);
if (!(rule is VariableProperty))
{
Current.RecordError(ErrorType.Parser, rule, "Expected variable declaration");
throw new StoppedParsingException();
}
rules.Add((VariableProperty)rule);
continue;
}
frames.Add(ParseKeyFrame(stream));
}
if (stream.Peek() != '}')
{
Current.RecordError(ErrorType.Parser, Position.Create(start, stream.Position, Current.CurrentFilePath), "Expected '}'");
throw new StoppedParsingException();
}
stream.Advance(); // Skip }
return new KeyFramesBlock(prefix, name, frames, rules, start, stream.Position, Current.CurrentFilePath);
}
internal static List<Property> ParseCssRules(Selector selector, ParserStream stream)
{
var ret = new List<Property>();
while (stream.HasMore() && stream.Peek() != '}')
{
var c = stream.Peek();
if (char.IsWhiteSpace(c))
{
stream.AdvancePastWhiteSpace();
}
else
{
ret.Add(ParseRule(stream));
}
}
stream.AdvancePast("}");
return ret;
}
internal static List<SpriteRule> ParseSpriteRules(ParserStream stream)
{
var ret = new List<SpriteRule>();
stream.AdvancePast("{");
while (stream.HasMore() && stream.Peek() != '}')
{
var c = stream.Peek();
if (char.IsWhiteSpace(c))
{
stream.AdvancePastWhiteSpace();
}
else
{
ret.Add(ParseSpriteRule(stream));
}
}
stream.AdvancePast("}");
return ret;
}
internal static Value ParseImpl(ParserStream stream, IPosition forPosition, bool allowSelectorIncludes)
{
Value ret = null;
while (stream.HasMore())
{
var c = stream.Peek();
if (char.IsWhiteSpace(c))
{
stream.AdvancePastWhiteSpace();
continue;
}
if (ret != null)
{
if (c.In('+', '-', '*', '/', '%'))
{
ret = ParseMathValue(c, ret, stream, forPosition);
continue;
}
if (c == '?')
{
stream.Advance(); // skip ?
if (stream.HasMore() && stream.Peek() == '?')
{
if (ret == null)
{
Current.RecordError(ErrorType.Parser, forPosition, "Expected value, found '??'");
throw new StoppedParsingException();
}
stream.Advance(); // skip second ?
var rhs = ParseImpl(stream, forPosition, allowSelectorIncludes);
ret = new MathValue(ret, Operator.Take_Exists, rhs);
continue;
}
ret = new LeftExistsValue(ret);
continue;
}
}
if (char.IsDigit(c) || c == '.' || c == '-')
{
ret = Combine(ret, ParseNumber(stream, forPosition));
continue;
}
if (c == '(')
{
ret = Combine(ret, ParseGroup(stream, forPosition));
continue;
}
if (c.In('\'', '"'))
{
ret = Combine(ret, ParseQuotedString(c, stream, forPosition));
continue;
}
if (c == '#')
{
ret = Combine(ret, ParseHashColor(stream, forPosition));
continue;
}
if (c == '@')
{
ret = Combine(ret, ParseFuncValue(stream, forPosition, allowSelectorIncludes));
continue;
}
ret = Combine(ret, ParseString(stream, forPosition));
}
return ret;
}
internal static Value ParseImpl(ParserStream stream, IPosition forPosition, bool allowSelectorIncludes)
{
Value ret = null;
while (stream.HasMore())
{
var c = stream.Peek();
if (char.IsWhiteSpace(c))
{
stream.AdvancePastWhiteSpace();
continue;
}
if (ret != null)
{
if (c.In('+', '-', '*', '/', '%'))
{
ret = ParseMathValue(c, ret, stream, forPosition);
continue;
}
if (c == '?')
{
stream.Advance(); // skip ?
if (stream.HasMore() && stream.Peek() == '?')
{
if (ret == null)
{
Current.RecordError(ErrorType.Parser, forPosition, "Expected value, found '??'");
throw new StoppedParsingException();
}
stream.Advance(); // skip second ?
var rhs = ParseImpl(stream, forPosition, allowSelectorIncludes);
ret = new MathValue(ret, Operator.Take_Exists, rhs);
continue;
}
ret = new LeftExistsValue(ret);
continue;
}
}
if (char.IsDigit(c) || c == '.' || c == '-')
{
ret = Combine(ret, ParseNumber(stream, forPosition));
continue;
}
if (c == '(')
{
ret = Combine(ret, ParseGroup(stream, forPosition));
continue;
}
if (c.In('\'', '"'))
{
ret = Combine(ret, ParseQuotedString(c, stream, forPosition));
continue;
}
if (c == '#')
{
ret = Combine(ret, ParseHashColor(stream, forPosition));
continue;
}
if (c == '@')
{
ret = Combine(ret, ParseFuncValue(stream, forPosition, allowSelectorIncludes));
continue;
}
ret = Combine(ret, ParseString(stream, forPosition));
}
return(ret);
}
