move fancy_syntax into Dart SVN

pkg/polymer_expressions/test/parser_test.dart

+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library parser_test;
+
+import 'package:polymer_expressions/parser.dart';
+import 'package:polymer_expressions/expression.dart';
+import 'package:unittest/unittest.dart';
+
+expectParse(String s, Expression e) =>
+    expect(new Parser(s).parse(), e, reason: s);
+
+main() {
+
+  group('parser', () {
+
+    test('should parse an empty expression', () {
+      expectParse('', empty());
+    });
+
+    test('should parse an identifier', () {
+      expectParse('abc', ident('abc'));
+    });
+
+    test('should parse a string literal', () {
+      expectParse('"abc"', literal('abc'));
+    });
+
+    test('should parse an integer literal', () {
+      expectParse('123', literal(123));
+    });
+
+    test('should parse a double literal', () {
+      expectParse('1.23', literal(1.23));
+    });
+
+    test('should parse a positive double literal', () {
+      expectParse('+1.23', literal(1.23));
+    });
+
+    test('should parse a negative double literal', () {
+      expectParse('-1.23', literal(-1.23));
+    });
+
+    test('should parse a plus operator with literals', () {
+      expectParse('1 + 2', binary(literal(1), '+', literal(2)));
+    });
+
+    test('should parse binary operators', () {
+      expectParse('a && b', binary(ident('a'), '&&', ident('b')));
+      expectParse('1 && 2', binary(literal(1), '&&', literal(2)));
+      expectParse('false && true', binary(literal(false), '&&', literal(true)));
+      expectParse('false || true', binary(literal(false), '||', literal(true)));
+    });
+
+    test('should give multiply higher associativity than plus', () {
+      expectParse('a + b * c',
+          binary(
+              ident('a'),
+              '+',
+              binary(ident('b'), '*', ident('c'))));
+    });
+
+    test('should give multiply higher associativity than plus 2', () {
+      expectParse('a * b + c',
+          binary(
+              binary(ident('a'), '*', ident('b')),
+              '+',
+              ident('c')));
+    });
+
+    test('should parse a dot operator', () {
+      expectParse('a.b', invoke(ident('a'), 'b'));
+    });
+
+    test('should parse chained dot operators', () {
+      expectParse('a.b.c', invoke(invoke(ident('a'), 'b'), 'c'));
+    });
+
+    test('should give dot high associativity', () {
+      expectParse('a * b.c', binary(ident('a'), '*', invoke(ident('b'), 'c')));
+    });
+
+    test('should parse a function with no arguments', () {
+      expectParse('a()', invoke(ident('a'), null, []));
+    });
+
+    test('should parse a single function argument', () {
+      expectParse('a(b)', invoke(ident('a'), null, [ident('b')]));
+    });
+
+    test('should parse a function call as a subexpression', () {
+      expectParse('a() + 1',
+          binary(
+              invoke(ident('a'), null, []),
+              '+',
+              literal(1)));
+    });
+
+    test('should parse multiple function arguments', () {
+      expectParse('a(b, c)',
+          invoke(ident('a'), null, [ident('b'), ident('c')]));
+    });
+
+    test('should parse nested function calls', () {
+      expectParse('a(b(c))', invoke(ident('a'), null, [
+          invoke(ident('b'), null, [ident('c')])]));
+    });
+
+    test('should parse an empty method call', () {
+      expectParse('a.b()', invoke(ident('a'), 'b', []));
+    });
+
+    test('should parse a method call with a single argument', () {
+      expectParse('a.b(c)', invoke(ident('a'), 'b', [ident('c')]));
+    });
+
+    test('should parse a method call with multiple arguments', () {
+      expectParse('a.b(c, d)',
+          invoke(ident('a'), 'b', [ident('c'), ident('d')]));
+    });
+
+    test('should parse chained method calls', () {
+      expectParse('a.b().c()', invoke(invoke(ident('a'), 'b', []), 'c', []));
+    });
+
+    test('should parse chained function calls', () {
+      expectParse('a()()', invoke(invoke(ident('a'), null, []), null, []));
+    });
+
+    test('should parse parenthesized expression', () {
+      expectParse('(a)', paren(ident('a')));
+      expectParse('(( 3 * ((1 + 2)) ))', paren(paren(
+          binary(literal(3), '*', paren(paren(
+              binary(literal(1), '+', literal(2))))))));
+    });
+
+    test('should parse an index operator', () {
+      expectParse('a[b]', invoke(ident('a'), '[]', [ident('b')]));
+      expectParse('a.b[c]', invoke(invoke(ident('a'), 'b', null),
+          '[]', [ident('c')]));
+    });
+
+    test('should parse chained index operators', () {
+      expectParse('a[][]', invoke(invoke(ident('a'), '[]', []), '[]', []));
+    });
+
+    test('should parse multiple index operators', () {
+      expectParse('a[b] + c[d]', binary(
+          invoke(ident('a'), '[]', [ident('b')]),
+          '+',
+          invoke(ident('c'), '[]', [ident('d')])));
+    });
+
+    test('should parse a filter chain', () {
+      expectParse('a | b | c', binary(binary(ident('a'), '|', ident('b')),
+          '|', ident('c')));
+    });
+
+    test('should parse comprehension', () {
+      expectParse('a in b', inExpr(ident('a'), ident('b')));
+      expectParse('a in b.c',
+          inExpr(ident('a'), invoke(ident('b'), 'c', null)));
+      expectParse('a in b + c',
+          inExpr(ident('a'), binary(ident('b'), '+', ident('c'))));
+    });
+
+    test('should reject comprehension with non-assignable left expression', () {
+      expect(() => parse('a + 1 in b'), throwsException);
+    });
+
+    test('should reject keywords as identifiers', () {
+      expect(() => parse('a.in'), throwsException);
+    });
+
+    test('should parse map literals', () {
+      expectParse("{'a': 1}",
+          mapLiteral([mapLiteralEntry(literal('a'), literal(1))]));
+      expectParse("{'a': 1, 'b': 2 + 3}",
+          mapLiteral([
+              mapLiteralEntry(literal('a'), literal(1)),
+              mapLiteralEntry(literal('b'),
+                  binary(literal(2), '+', literal(3)))]));
+      expectParse("{'a': foo()}",
+          mapLiteral([mapLiteralEntry(
+              literal('a'), invoke(ident('foo'), null, []))]));
+      expectParse("{'a': foo('a')}",
+          mapLiteral([mapLiteralEntry(
+              literal('a'), invoke(ident('foo'), null, [literal('a')]))]));
+    });
+
+    test('should parse map literals with method calls', () {
+      expectParse("{'a': 1}.length",
+          invoke(mapLiteral([mapLiteralEntry(literal('a'), literal(1))]),
+              'length'));
+    });
+  });
+}