/*
* Transforms obj["foo"] into obj.foo whenever possible, saving 3 bytes.
*/
private static void OptimizeObjectMemberAccess(IList tokens)
{
string tv;
int i, length;
JavaScriptToken token;
for (i = 0, length = tokens.Count; i < length; i++)
{
if (((JavaScriptToken) tokens[i]).TokenType == Token.LB &&
i > 0 && i < length - 2 &&
((JavaScriptToken) tokens[i - 1]).TokenType == Token.NAME &&
((JavaScriptToken) tokens[i + 1]).TokenType == Token.STRING &&
((JavaScriptToken) tokens[i + 2]).TokenType == Token.RB)
{
token = (JavaScriptToken) tokens[i + 1];
tv = token.Value;
tv = tv.Substring(1, tv.Length - 2);
if (IsValidIdentifier(tv))
{
tokens[i] = new JavaScriptToken(Token.DOT, ".");
tokens[i + 1] = new JavaScriptToken(Token.NAME, tv);
tokens.RemoveAt(i + 2);
i = i + 2;
length = length - 1;
}
}
}
}
/*
* Transforms 'foo': ... into foo: ... whenever possible, saving 2 bytes.
*/
private static void OptimizeObjLitMemberDecl(IList tokens)
{
string tv;
int i, length;
JavaScriptToken token;
for (i = 0, length = tokens.Count; i < length; i++)
{
if (((JavaScriptToken) tokens[i]).TokenType == Token.OBJECTLIT &&
i > 0 && ((JavaScriptToken) tokens[i - 1]).TokenType == Token.STRING)
{
token = (JavaScriptToken) tokens[i - 1];
tv = token.Value;
tv = tv.Substring(1, tv.Length - 2);
if (IsValidIdentifier(tv))
{
tokens[i - 1] = new JavaScriptToken(Token.NAME, tv);
}
}
}
}
private static void ProcessStringLiterals(IList tokens, bool merge)
{
string tv;
int i, length = tokens.Count;
JavaScriptToken token, prevToken, nextToken;
if (merge)
{
// Concatenate string literals that are being appended wherever
// it is safe to do so. Note that we take care of the case:
// "a" + "b".toUpperCase()
for (i = 0; i < length; i++)
{
token = (JavaScriptToken) tokens[i];
switch (token.TokenType)
{
case Token.ADD:
if (i > 0 && i < length)
{
prevToken = (JavaScriptToken) tokens[i - 1];
nextToken = (JavaScriptToken) tokens[i + 1];
if (prevToken.TokenType == Token.STRING && nextToken.TokenType == Token.STRING &&
(i == length - 1 || ((JavaScriptToken) tokens[i + 2]).TokenType != Token.DOT))
{
tokens[i - 1] = new JavaScriptToken(Token.STRING,
prevToken.Value + nextToken.Value);
tokens.RemoveAt(i + 1);
tokens.RemoveAt(i);
i = i - 1;
length = length - 2;
break;
}
}
break;
}
}
}
// Second pass...
for (i = 0; i < length; i++)
{
token = (JavaScriptToken) tokens[i];
if (token.TokenType == Token.STRING)
{
tv = token.Value;
// Finally, add the quoting characters and escape the string. We use
// the quoting character that minimizes the amount of escaping to save
// a few additional bytes.
int singleQuoteCount = CountChar(tv, '\'');
int doubleQuoteCount = CountChar(tv, '"');
char quotechar = doubleQuoteCount <= singleQuoteCount ? '"' : '\'';
tv = quotechar + EscapeString(tv, quotechar) + quotechar;
// String concatenation transforms the old script scheme:
// '<scr'+'ipt ...><'+'/script>'
// into the following:
// '<script ...></script>'
// which breaks if this code is embedded inside an HTML document.
// Since this is not the right way to do this, let's fix the code by
// transforming all "</script" into "<\/script"
if (tv.IndexOf("</script", StringComparison.OrdinalIgnoreCase) >= 0)
{
tv = tv.Replace("<\\/script", "<\\\\/script");
}
tokens[i] = new JavaScriptToken(Token.STRING, tv);
}
}
}
