public void parseContents(Parser parser) {
_select = parser.parseExpression(this, "select", null);
parseChildren(parser);
// make sure required attribute(s) have been set
if (_select.isDummy()) {
reportError(this, parser, ErrorMsg.REQUIRED_ATTR_ERR, "select");
}
}
/**
* When the name of this ParserExtension is encountered by a parser with which the extension is
* registered, the parser calls this routine to parse the summation subexpression. The
* subexpression has the form (<variable>,<lower-limit>,<upper-limit>,<expression>). This method
* is not meant to be called directly
*/
public void doParse(Parser parser, ParserContext context) {
int tok = context.next();
String open = context.tokenString;
if (tok == ParserContext.OPCHARS
&& (open.equals("(")
|| (open.equals("[") && (context.options & Parser.BRACKETS) != 0)
|| (open.equals("{") && (context.options & Parser.BRACES) != 0))) {
String close = open.equals("(") ? ")" : (open.equals("[") ? "]" : "}");
tok = context.next(); // Must be an identifier.
if (tok != ParserContext.IDENTIFIER)
throw new ParseError(
"Expected the summation variable as the first argument of " + name + ".", context);
String varName = context.tokenString;
tok = context.next();
if (tok != ParserContext.OPCHARS || !context.tokenString.equals(","))
throw new ParseError(
"Exprected a comma after the index variable, " + varName + ".", context);
parser.parseExpression(context);
tok = context.next();
if (tok != ParserContext.OPCHARS || !context.tokenString.equals(","))
throw new ParseError(
"Exprected a comma after the lower limit expression for " + name + ".", context);
parser.parseExpression(context);
tok = context.next();
if (tok != ParserContext.OPCHARS || !context.tokenString.equals(","))
throw new ParseError(
"Exprected a comma after the upper limit expression for " + name + ".", context);
Variable v = new Variable(varName);
context.mark(); // Temporoarily add the summation variable to the symbol table.
context.add(v);
ExpressionProgram saveProg = context.prog;
context.prog = new ExpressionProgram(); // Compile the expression into a new program.
parser.parseExpression(context);
tok = context.next();
if (tok != ParserContext.OPCHARS || !context.tokenString.equals(close))
throw new ParseError(
"Expected a \"" + close + "\" at the end of the paramter list for " + name + ".",
context);
context.revert(); // Restore the state of the ParserContext.
saveProg.addCommandObject(new Cmd(v, context.prog));
context.prog = saveProg;
} else throw new ParseError("Parentheses required around parameters of summation.", context);
} // end doParse()
/** Parse the attributes of the xsl:sort element */
public void parseContents(Parser parser) {
final SyntaxTreeNode parent = getParent();
if (!(parent instanceof ApplyTemplates) && !(parent instanceof ForEach)) {
reportError(this, parser, ErrorMsg.STRAY_SORT_ERR, null);
return;
}
// Parse the select expression (node string value if no expression)
_select = parser.parseExpression(this, "select", "string(.)");
// Get the sort order; default is 'ascending'
String val = getAttribute("order");
if (val.length() == 0) val = "ascending";
_order = AttributeValue.create(this, val, parser);
// Get the sort data type; default is text
val = getAttribute("data-type");
if (val.length() == 0) {
try {
final Type type = _select.typeCheck(parser.getSymbolTable());
if (type instanceof IntType) val = "number";
else val = "text";
} catch (TypeCheckError e) {
val = "text";
}
}
_dataType = AttributeValue.create(this, val, parser);
_lang = getAttribute("lang"); // bug! see 26869
// val = getAttribute("lang");
// _lang = AttributeValue.create(this, val, parser);
// Get the case order; default is language dependant
val = getAttribute("case-order");
_caseOrder = AttributeValue.create(this, val, parser);
}
/**
* Two-pass parsing of ATVs. In the first pass, double curly braces are replaced by one, and
* expressions are delimited using DELIMITER. The second pass splits up the resulting buffer into
* literal and non-literal expressions. Errors are reported during the first pass.
*/
private void parseAVTemplate(String text, Parser parser) {
StringTokenizer tokenizer = new StringTokenizer(text, "{}\"\'", true);
/*
* First pass: replace double curly braces and delimit expressions
* Simple automaton to parse ATVs, delimit expressions and report
* errors.
*/
String t = null;
String lookahead = null;
StringBuffer buffer = new StringBuffer();
int state = OUT_EXPR;
while (tokenizer.hasMoreTokens()) {
// Use lookahead if available
if (lookahead != null) {
t = lookahead;
lookahead = null;
} else {
t = tokenizer.nextToken();
}
if (t.length() == 1) {
switch (t.charAt(0)) {
case '{':
switch (state) {
case OUT_EXPR:
lookahead = tokenizer.nextToken();
if (lookahead.equals("{")) {
buffer.append(lookahead); // replace {{ by {
lookahead = null;
} else {
buffer.append(DELIMITER);
state = IN_EXPR;
}
break;
case IN_EXPR:
case IN_EXPR_SQUOTES:
case IN_EXPR_DQUOTES:
reportError(getParent(), parser, ErrorMsg.ATTR_VAL_TEMPLATE_ERR, text);
break;
}
break;
case '}':
switch (state) {
case OUT_EXPR:
lookahead = tokenizer.nextToken();
if (lookahead.equals("}")) {
buffer.append(lookahead); // replace }} by }
lookahead = null;
} else {
reportError(getParent(), parser, ErrorMsg.ATTR_VAL_TEMPLATE_ERR, text);
}
break;
case IN_EXPR:
buffer.append(DELIMITER);
state = OUT_EXPR;
break;
case IN_EXPR_SQUOTES:
case IN_EXPR_DQUOTES:
buffer.append(t);
break;
}
break;
case '\'':
switch (state) {
case IN_EXPR:
state = IN_EXPR_SQUOTES;
break;
case IN_EXPR_SQUOTES:
state = IN_EXPR;
break;
case OUT_EXPR:
case IN_EXPR_DQUOTES:
break;
}
buffer.append(t);
break;
case '\"':
switch (state) {
case IN_EXPR:
state = IN_EXPR_DQUOTES;
break;
case IN_EXPR_DQUOTES:
state = IN_EXPR;
break;
case OUT_EXPR:
case IN_EXPR_SQUOTES:
break;
}
buffer.append(t);
break;
default:
buffer.append(t);
break;
}
} else {
buffer.append(t);
}
}
// Must be in OUT_EXPR at the end of parsing
if (state != OUT_EXPR) {
reportError(getParent(), parser, ErrorMsg.ATTR_VAL_TEMPLATE_ERR, text);
}
/*
* Second pass: split up buffer into literal and non-literal expressions.
*/
tokenizer = new StringTokenizer(buffer.toString(), DELIMITER, true);
while (tokenizer.hasMoreTokens()) {
t = tokenizer.nextToken();
if (t.equals(DELIMITER)) {
addElement(parser.parseExpression(this, tokenizer.nextToken()));
tokenizer.nextToken(); // consume other delimiter
} else {
addElement(new LiteralExpr(t));
}
}
}
