private Ast.Expr ParseExpr(TokenQueue q)
{
var start = q.GetLocation();
var tok = q.SourceToken;
Ast.SqliteSyntaxProduction syntaxNode;
var result = SqliteParser.ReadExpr(q, out syntaxNode);
if (result.IsValid)
{
return(new Ast.Expr {
Sql = q.Substring(start, result.NumValidTokens),
SourceToken = tok,
SqliteSyntax = syntaxNode
});
}
else if (result.InvalidMessage != null)
{
throw new SyntaxException(result.InvalidMessage);
}
else
{
throw new SyntaxException(q);
}
}
private Ast.SqlStmt ParseSqlStmt(TokenQueue q, string rootProdName = "sql-stmt")
{
var start = q.GetLocation();
var tok = q.SourceToken;
Ast.SqliteSyntaxProduction syntaxNode;
var result = SqliteParser.ReadStmt(q, out syntaxNode, rootProdName);
if (result.IsValid)
{
var stmt = new Ast.SqlStmt {
Sql = q.Substring(start, result.NumValidTokens),
SourceToken = tok,
SqliteSyntax = syntaxNode
};
_preprocessor.PreprocessStmt(stmt);
return(stmt);
}
else if (result.InvalidMessage != null)
{
throw new SyntaxException(result.InvalidMessage);
}
else
{
throw new SyntaxException(q);
}
}
private bool PeekExpr(TokenQueue q)
{
var start = q.GetLocation();
var tok = q.SourceToken;
Ast.SqliteSyntaxProduction ast;
var result = SqliteParser.ReadExpr(q, out ast);
q.Jump(start);
return(result.IsValid);
}