public override IMatched <Unit> Suffix(ParseState state, Expression expression, Block block)
{
var elseIf = none <If>();
var elseIfParser = new ElseIfParser(fieldName, mutable, assignment);
if (elseIfParser.Scan(state).If(out _, out var _exception))
{
elseIf = elseIfParser.If;
}
else if (_exception.If(out var exception))
{
return(failedMatch <Unit>(exception));
}
var elseBlock = none <Block>();
var elseParser = new ElseParser();
if (elseParser.Scan(state).If(out _, out _exception))
{
elseBlock = elseParser.Block;
}
else if (_exception.If(out var exception))
{
return(failedMatch <Unit>(exception));
}
state.AddStatement(new If(expression, block, elseIf, elseBlock, fieldName, mutable, assignment, true));
return(Unit.Matched());
}
public override IMatched <Unit> ParseStatement(ParseState state, Token[] tokens)
{
state.BeginTransaction();
state.Colorize(tokens, Color.Keyword, Color.Whitespace);
var result =
from comparisand in getExpression(state, ExpressionFlags.Comparisand)
from scanned in state.Scan("^ /(|s|) /':='", Color.Whitespace, Color.Structure)
from expression in getExpression(state, ExpressionFlags.Standard)
from and in getAnd(state)
from block in getBlock(state)
select(comparisand, expression, and, block);
if (result.ValueOrCast <Unit>(out var tuple, out var asUnit))
{
var(comparisand, expression, and, block) = tuple;
var elseBlock = none <Block>();
var elseParser = new ElseParser();
if (elseParser.Scan(state).If(out _, out var anyException))
{
elseBlock = elseParser.Block;
}
else if (anyException.If(out var exception))
{
state.RollBackTransaction();
return(failedMatch <Unit>(exception));
}
if (and.If(out var a))
{
var builder = new ExpressionBuilder(ExpressionFlags.Comparisand);
builder.Add(a);
if (builder.ToExpression().IfNot(out expression, out var exception))
{
state.RollBackTransaction();
return(failedMatch <Unit>(exception));
}
}
state.CommitTransaction();
state.AddStatement(new ConditionalAssign(comparisand, expression, block, elseBlock));
return(Unit.Matched());
}
else
{
state.RollBackTransaction();
return(asUnit);
}
}