add basic support for parsing new expressions

src/expression/parse.js

@@ -51,7 +51,7 @@ class RootExpression extends ParsedExpression {
 class TypeCastExpression extends ParsedExpression {
     /**
      * 
-     * @param {string} cast_type 
+     * @param {ParsedExpression} cast_type 
      * @param {ParsedExpression} rhs 
      */
     constructor(cast_type, rhs) {
@@ -143,6 +143,44 @@ class MemberExpression extends QualifierExpression {
     }
 }
 
+class BracketedExpression extends ParsedExpression {
+    constructor(expression, qualified_terms) {
+        super();
+        this.expression = expression;
+        this.qualified_terms = qualified_terms;
+    }
+}
+
+class ParsedNewExpression extends ParsedExpression {}
+
+class NewObjectExpression extends ParsedNewExpression {
+    /**
+     * @param {RootExpression} ctr_call 
+     * @param {QualifierExpression[]} post_ctr_qualifiers
+     * @param {string} method_body
+     */
+    constructor(ctr_call, post_ctr_qualifiers, method_body) {
+        super();
+        this.ctr_call = ctr_call;
+        this.qualified_terms = post_ctr_qualifiers;
+        this.method_body = method_body;
+    }
+}
+
+class NewArrayExpression extends ParsedNewExpression {
+    /**
+     * @param {RootExpression} type 
+     * @param {ArrayIndexExpression[]} arrdim_initers
+     * @param {QualifierExpression[]} post_ctr_qualifiers
+     */
+    constructor(type, arrdim_initers, post_ctr_qualifiers) {
+        super();
+        this.type = type;
+        this.arrdim_initers = arrdim_initers;
+        this.post_ctr_qualifiers = post_ctr_qualifiers;
+    }
+}
+
 /**
  * Remove characters from the expression followed by any leading whitespace/comments
  * @param {ExpressionText} e
@@ -226,17 +264,21 @@ function parseBracketOrCastExpression(e) {
     if (!strip(e, ')')) {
         return null;
     }
-    if (res instanceof RootExpression) {
-        if (/^(int|long|byte|short|double|float|char|boolean)$/.test(res.root_term) && !res.qualified_terms.length) {
-            // primitive typecast
-            const castexpr = parse_expression_term(e);
-            if (!castexpr) {
-                return null;
-            }
-            res = new TypeCastExpression(res.root_term, castexpr);
+    // note - a bracketed expression followed by another bracketed expression is assumed to be a cast:
+    // double d = (double)(float)5; - is ok
+    // XYZ xyz = (new XYZ)(1,2,3); - nope
+    // - this will still need to be resolved for +/- e.g (int)+5 vs (some.field)+5
+    if (/^[\w"'(!~]/.test(e.expr)) {
+        // typecast
+        const castexpr = parse_expression(e);
+        if (!castexpr) {
+            return null;
         }
+        return new TypeCastExpression(res, castexpr);
     }
-    return res;
+
+    const qt = parse_qualified_terms(e);
+    return new BracketedExpression(res, qt);
 }
 
 /**
@@ -257,6 +299,89 @@ function parseUnaryExpression(e, unop) {
     return res;
 }
 
+/**
+ * @param {ExpressionText} e 
+ * @param {RootExpression} ctr 
+ * @param {QualifierExpression[]} ctr_qualifiers
+ * @param {QualifierExpression[]} post_ctr_qualifiers
+ */
+function parseNewObjectExpression(e, ctr, ctr_qualifiers, post_ctr_qualifiers) {
+    const ctr_call = new RootExpression(ctr.root_term, ctr.root_term_type, ctr_qualifiers);
+    let method_body = null;
+    if (!post_ctr_qualifiers.length) {
+        // if there are no qualifiers following the constructor, look for an anonymous method body
+        if (e.expr.startsWith('{')) {
+            // don't parse it - just scan for the closing brace
+            const brace_re = /\/\*[\d\D]*?\*\/|\/\/.*|".*?"|".*|'.'?|(\{)|(\})/g;
+            let balance = 0, body_end = e.expr.length;
+            for (let m; m = brace_re.exec(e.expr); ) {
+                if (m[1]) balance++;
+                else if (m[2] && (--balance === 0)) {
+                    body_end = m.index + 1;
+                    break;
+                }
+            }
+            method_body = e.expr.slice(0, body_end);
+            strip(e, method_body.length);
+        }
+    }
+    return new NewObjectExpression(ctr_call, post_ctr_qualifiers, method_body);
+}
+
+/**
+ * @param {ExpressionText} e 
+ * @param {RootExpression} ctr 
+ * @param {Number} first_array_qualifier_idx
+ */
+function parseNewArrayExpression(e, ctr, first_array_qualifier_idx) {
+    let arrdim_initers = [];
+    let i = first_array_qualifier_idx;
+    for (; i < ctr.qualified_terms.length; i++) {
+        const term = ctr.qualified_terms[i];
+        if (term instanceof ArrayIndexExpression) {
+            arrdim_initers.push(term);
+            continue;
+        }
+        break;
+    }
+    const type = new RootExpression(ctr.root_term, ctr.root_term_type, ctr.qualified_terms.slice(0, first_array_qualifier_idx));
+    return new NewArrayExpression(type, arrdim_initers, ctr.qualified_terms.slice(i));
+}
+    
+/**
+ * @param {ExpressionText} e 
+ */
+function parseNewExpression(e) {
+    const ctr = parse_expression_term(e);
+    if (!(ctr instanceof RootExpression)) {
+        return null;
+    }
+    let new_expression = null;
+    ctr.qualified_terms.find((qt,idx) => {
+        if (qt instanceof MethodCallExpression) {
+            // new object contructor - split into constructor qualifiers and post-ctr-qualifiers
+            const qualified_terms = ctr.qualified_terms.slice();
+            const ctr_qualifiers = qualified_terms.splice(0, idx + 1);
+            new_expression = parseNewObjectExpression(e, ctr, ctr_qualifiers, qualified_terms);
+            return true;
+        }
+        if (qt instanceof ArrayIndexExpression) {
+            // new array constructor
+            // in java, multi-dimensional array constructors have priority over array accessors
+            // e.g new int[2][1] - is a 2D array, 
+            //     (new int[2])[1] - is the 1th element of a 1D array
+            new_expression = parseNewArrayExpression(e, ctr, idx);
+            return true;
+        }
+    });
+    if (!new_expression) {
+        // treat unqualified new expressions as object constructors with no parameters
+        // eg. new XYZ === new XYZ()
+        new_expression = parseNewObjectExpression(e, ctr, ctr.qualified_terms, []);
+    }
+    return new_expression;
+}
+
 /**
  * @param {ExpressionText} e 
  */
@@ -279,10 +404,6 @@ function parse_expression_term(e) {
     if (qualified_terms === null) {
         return null;
     }
-    // the root term is not allowed to be a method call
-    if (qualified_terms[0] instanceof MethodCallExpression) {
-        return null;
-    }
     return new RootExpression(root_term[0], root_term_type, qualified_terms);
 }
 
@@ -299,6 +420,11 @@ function getBinaryOperator(s) {
  * @returns {ParsedExpression}
  */
 function parse_expression(e) {
+    const newop = e.expr.match(/^new\b/);
+    if (newop) {
+        strip(e, 3);
+        return parseNewExpression(e);
+    }
     const prefix_incdec = e.expr.match(/^(?:(\+\+)|\-\-)(?=[a-zA-Z_])/);
     if (prefix_incdec) {
         strip(e, 2);
@@ -355,6 +481,8 @@ module.exports = {
     ExpressionText,
     MemberExpression,
     MethodCallExpression,
+    NewArrayExpression,
+    NewObjectExpression,
     parse_expression,
     ParsedExpression,
     QualifierExpression,