// Parse a variable declaration statement
// - might include several variable definitions separated by commas.
// eg: var x=23, y, z=44;
ast.Statement ParseVarDeclStatement(ParseContext ctx)
{
// Is it a variable declaration?
if (t.token == Token.kw_var)
{
var bmk = t.GetBookmark();
t.Next();
// Parse the first varaible declaration
var stmt = new ast.StatementVariableDeclaration(bmk);
ParseVarDecl(ctx, stmt);
// Parse other declarations
while (t.SkipOptional(Token.comma))
{
ParseVarDecl(ctx, stmt);
}
// End of statement
return(stmt);
}
else
{
// Must be just a normal expression statement
return(new ast.StatementExpression(t.GetBookmark(), ParseCompositeExpression(ctx)));
}
}
// Parse a single variable declaration
void ParseVarDecl(ParseContext ctx, ast.StatementVariableDeclaration decl)
{
var bmk = t.GetBookmark();
// Variable name
t.Require(Token.identifier);
var name = t.identifier;
t.Next();
// Optional initial value
ast.Expression InitialValue = null;
if (t.SkipOptional(Token.assign))
{
InitialValue = ParseSingleExpression(ctx);
}
// Store it
decl.AddDeclaration(bmk, name, InitialValue);
}
// Parse a variable declaration statement
// - might include several variable definitions separated by commas.
// eg: var x=23, y, z=44;
ast.Statement ParseVarDeclStatement(ParseContext ctx)
{
// Is it a variable declaration?
if (t.token == Token.kw_var)
{
var bmk = t.GetBookmark();
t.Next();
// Parse the first varaible declaration
var stmt = new ast.StatementVariableDeclaration(bmk);
ParseVarDecl(ctx, stmt);
// Parse other declarations
while (t.SkipOptional(Token.comma))
{
ParseVarDecl(ctx, stmt);
}
// End of statement
return stmt;
}
else
{
// Must be just a normal expression statement
return new ast.StatementExpression(t.GetBookmark(), ParseCompositeExpression(ctx));
}
}