// {{#if ...}}
// ^
public static ReadOnlyMemory <char> ParseTemplateScriptBlock(this ReadOnlyMemory <char> literal, ScriptContext context, out PageBlockFragment blockFragment)
{
literal = literal.ParseVarName(out var blockNameSpan);
PageBlockFragment statement;
var blockName = blockNameSpan.ToString();
var endBlock = "{{/" + blockName + "}}";
var endExprPos = literal.IndexOf("}}");
if (endExprPos == -1)
{
throw new SyntaxErrorException($"Unterminated '{blockName}' block expression, near '{literal.DebugLiteral()}'");
}
var argument = literal.Slice(0, endExprPos).Trim();
literal = literal.Advance(endExprPos + 2);
var language = context.ParseAsLanguage.TryGetValue(blockName, out var lang)
? lang
: ScriptTemplate.Language;
if (language.Name == ScriptVerbatim.Language.Name)
{
var endBlockPos = literal.IndexOf(endBlock);
if (endBlockPos == -1)
{
throw new SyntaxErrorException($"Unterminated end block '{endBlock}'");
}
var body = literal.Slice(0, endBlockPos);
literal = literal.Advance(endBlockPos + endBlock.Length).TrimFirstNewLine();
blockFragment = language.ParseVerbatimBlock(blockName, argument, body);
return(literal);
}
literal = literal.ParseTemplateBody(blockNameSpan, out var bodyText);
var bodyFragments = language.Parse(context, bodyText);
var elseBlocks = new List <PageElseBlock>();
while (literal.StartsWith("{{else"))
{
literal = literal.ParseTemplateElseBlock(blockName, out var elseArgument, out var elseBody);
var elseBlock = new PageElseBlock(elseArgument, language.Parse(context, elseBody));
elseBlocks.Add(elseBlock);
}
literal = literal.Advance(2 + 1 + blockName.Length + 2);
//remove new line after partial block end tag
literal = literal.TrimFirstNewLine();
blockFragment = new PageBlockFragment(blockName, argument, bodyFragments, elseBlocks);
return(literal);
}
protected virtual async Task WriteElseAsync(ScriptScopeContext scope, PageElseBlock fragment, CancellationToken token)
{
if (fragment.Body != null)
{
await WriteAsync(scope, fragment.Body, GetElseCallTrace(fragment), token);
}
else if (fragment.BodyStatement?.Statements != null)
{
await WriteAsync(scope, fragment.BodyStatement.Statements, GetElseCallTrace(fragment), token);
}
}
// #if ...
// ^
public static ReadOnlyMemory <char> ParseCodeScriptBlock(this ReadOnlyMemory <char> literal, ScriptContext context,
out PageBlockFragment blockFragment)
{
literal = literal.ParseVarName(out var blockNameSpan);
var endArgumentPos = literal.IndexOf('\n');
var argument = literal.Slice(0, endArgumentPos).Trim();
literal = literal.Slice(endArgumentPos + 1);
var blockName = blockNameSpan.ToString();
var language = context.ParseAsLanguage.TryGetValue(blockName, out var lang)
? lang
: ScriptCode.Language;
if (language.Name == ScriptVerbatim.Language.Name)
{
literal = literal.ParseCodeBody(blockNameSpan, out var body);
body = body.ChopNewLine();
blockFragment = language.ParseVerbatimBlock(blockName, argument, body);
return(literal);
}
literal = literal.ParseCodeBody(blockNameSpan, out var bodyText);
var bodyFragments = language.Parse(context, bodyText);
var elseBlocks = new List <PageElseBlock>();
literal = literal.AdvancePastWhitespace();
while (literal.StartsWith("else"))
{
literal = literal.ParseCodeElseBlock(blockNameSpan, out var elseArgument, out var elseBody);
var elseBlock = new PageElseBlock(elseArgument, language.Parse(context, elseBody));
elseBlocks.Add(elseBlock);
literal = literal.AdvancePastWhitespace();
}
blockFragment = new PageBlockFragment(blockName, argument, bodyFragments, elseBlocks);
return(literal);
}
protected virtual async Task WriteElseAsync(ScriptScopeContext scope, PageElseBlock fragment, CancellationToken token)
{
await WriteAsync(scope, fragment.Body, GetElseCallTrace(fragment), token);
}
protected virtual string GetElseCallTrace(PageElseBlock fragment) => "Block: " + Name + " > Else" +
(fragment.Argument.IsNullOrEmpty() ? "" : " (" + fragment.Argument + ")");
