Method parseIf

chapter21/src/main/java/com/seaofnodes/simple/Parser.java:509–514

Parses a statement if ( expression ) statement [else statement] @return a Node, never null

()

        // Parse predicate
        require("(");
        var pred = require(parseAsgn(), ")");
        return parseTrinary(pred,true,"else");
    }

    // Parse a conditional expression, merging results.
    private Node parseTrinary( Node pred, boolean stmt, String fside ) {
        pred.keep();

        // IfNode takes current control and predicate