// ActionClause ::= Action Article ActionSubjectTerminal
private TranslateResult ActionClause(ILexer lexer)
{
var result = new TranslateResult();
var simpleActionResult = ActionVerbTerminal(lexer);
result.Join(simpleActionResult);
if (result.IsSuccessful)
{
var nextToken = lexer.PeekNextToken();
while (nextToken.Type == TokenType.Article)
{
lexer.ConsumeNextToken();
nextToken = lexer.PeekNextToken();
}
var actionSubjectResult = ActionSubjectTerminal(lexer);
result.Join(actionSubjectResult);
if (result.IsSuccessful)
{
result.Code = $"{actionSubjectResult.Code}\n\t\t{simpleActionResult.Code}";
}
}
return(result);
}
// VerbClause ::= ("is")? ConditionVerbTerminal
private TranslateResult VerbClause(ILexer lexer)
{
var nextToken = lexer.PeekNextToken();
while (nextToken.Type == TokenType.NoOp)
{
lexer.ConsumeNextToken();
nextToken = lexer.PeekNextToken();
}
var result = ConditionVerbTerminal(lexer);
return(result);
}
// SubjectClause ::= ( "a" | "an" | "the")? ConditionSubjectTerminal
private TranslateResult SubjectClause(ILexer lexer)
{
var nextToken = lexer.PeekNextToken();
while (nextToken.Type == TokenType.Article)
{
lexer.ConsumeNextToken();
nextToken = lexer.PeekNextToken();
}
var result = ConditionSubjectTerminal(lexer);
return(result);
}
// IfStatement ::= "If" Condition "Then" ActionClause ElseClause?
private TranslateResult IfClause(ILexer lexer)
{
var result = new TranslateResult();
lexer.ConsumeNextToken();
// Execute ConditionStatement
var conditionClauseResult = ConditionClause(lexer);
result.Join(conditionClauseResult);
// Check for "Then"
var token = lexer.PeekNextToken();
if (token.Type != TokenType.Then)
{
result.ErrorMessage = string.Format(ErrorMessageFormat, "then", token.Text);
return(result);
}
lexer.ConsumeNextToken();
var actionClauseResult = ActionClause(lexer);
result.Join(actionClauseResult);
if (result.IsSuccessful)
{
// Execute ElseClause
result.Code = $@"if({conditionClauseResult.Code})
{{
{actionClauseResult.Code}
}}";
}
return(result);
}
