Examples with WordInfo uk.me.parabola.mkgmap.scan.WordInfo used on opensource projects

Example 1 with WordInfo

use of uk.me.parabola.mkgmap.scan.WordInfo in project mkgmap by openstreetmap.

the class ExpressionReader method readConditions.

/**
 * Read the conditions.  They are terminated by a '[' or '{' character
 * or by end of file.
 * @param ifStack expressions of enclosing if / else
 */
public Op readConditions(Collection<Op[]> ifStack) {
    boolean consumedNonBlank = false;
    while (!scanner.isEndOfFile()) {
        scanner.skipSpace();
        if (scanner.checkToken("[") || scanner.checkToken("{") || scanner.checkToken("then"))
            break;
        consumedNonBlank = true;
        WordInfo wordInfo = scanner.nextWordWithInfo();
        if (isOperation(wordInfo)) {
            saveOp(wordInfo.getText());
        } else if (wordInfo.isQuoted()) {
            pushValue(wordInfo.getText());
        } else if (wordInfo.getText().charAt(0) == '$') {
            String tagname = scanner.nextWord();
            if (tagname.equals("{")) {
                tagname = scanner.nextWord();
                scanner.validateNext("}");
            }
            stack.push(new GetTagFunction(tagname));
        } else if (scanner.checkToken("(")) {
            // it is a function
            // this requires a () after the function name
            scanner.validateNext("(");
            scanner.validateNext(")");
            saveFunction(wordInfo.getText());
        } else {
            pushValue(wordInfo.getText());
        }
    }
    // Complete building the tree
    while (!opStack.isEmpty()) runOp(scanner);
    if (consumedNonBlank && !ifStack.isEmpty() && stack.size() <= 1) {
        // add expressions from enclosing if /else statements
        Op op = null;
        if (!stack.isEmpty())
            op = stack.pop();
        stack.push(appendIfExpr(op, ifStack));
    }
    // The stack should contain one entry which is the complete tree
    if (stack.size() != 1) {
        throw new SyntaxException(scanner, "Stack size is " + stack.size() + " (missing or incomplete expression)");
    }
    assert stack.size() == 1;
    Op op = stack.pop();
    if (op instanceof ValueOp)
        throw new SyntaxException(scanner, "Incomplete expression, just a single symbol: " + op);
    return op;
}