Move PEG parser test into testing framework.

utils/peg/pegparser_test.dart

-// Copyright (c) 2011, 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.
-
-#import('pegparser.dart');
-
-testParens() {
-  Grammar g = new Grammar();
-  Symbol a = g['A'];
-
-  a.def = ['(', MANY(a, min:0), ')', (a) => a];
-
-  check(g, a, "", null);
-  check(g, a, "()", '[]');
-  check(g, a, "(()())", '[[],[]]');
-  check(g, a, "(()((()))())", '[[],[[[]]],[]]');
-}
-
-testBlockComment() {
-
-  // Block comment in whitespace.
-
-  Grammar g = new Grammar();
-  Symbol blockComment = g['blockComment'];
-
-  blockComment.def =
-      ['/*',
-       MANY(OR([blockComment,
-                [NOT('*/'), CHAR()],
-                [END, ERROR('EOF in block comment')]
-                ]),
-            min: 0),
-       '*/'];
-  print(blockComment);
-
-  var a = MANY(TEXT('x'));
-
-  g.whitespace = OR([g.whitespace, blockComment]);
-
-  check(g, a, "x /**/ x", '[x,x]');
-  check(g, a, "x /*/**/*/ x", '[x,x]');
-  check(g, a, "x /*/***/ x", 'EOF in block comment');
-  check(g, a, "x /*/*/x**/**/ x", '[x,x]');
-
-  check(g, a, @"""
-/* Comment */
-/* Following comment with /* nested comment*/ */
-x
-/* x in comment */
-x /* outside comment */
-""",
-        '[x,x]');
-}
-
-testTEXT() {
-  Grammar g = new Grammar();
-
-  // TEXT grabs the parsed text,
-  check(g, TEXT(LEX(MANY(OR(['1','a'])))), '  1a1  ', '1a1');
-
-  // Without the lexical context, TEXT will grab intervening whitespace.
-  check(g, TEXT(MANY(OR(['1','a']))), '  1a1  ', '1a1');
-  check(g, TEXT(MANY(OR(['1','a']))), '  1  a 1  ', '1  a 1');
-
-  // Custom processing of the TEXT substring.
-  var binaryNumber =
-      TEXT(LEX(MANY(OR(['0','1']))),
-           (str, start, end) {
-             var r = 0;
-             var zero = '0'.charCodeAt(0);
-             for (int i = start; i < end; i++)
-               r = r * 2 + (str.charCodeAt(i) - zero);
-             return r;
-           });
-
-  check(g, binaryNumber, ' 10101 ', 21);
-  check(g, binaryNumber, '1010111', 87);
-  check(g, binaryNumber, '1010 111', null);
-}
-
-testOR() {
-  // OR matches the first match.
-  Grammar g = new Grammar();
-  check(g, OR([['a', NOT(END), () => 1],
-               ['a', () => 2],
-               ['a', () => 3]]),
-        'a', 2);
-}
-
-testCODE() {
-  Grammar g = new Grammar();
-  var a = TEXT(LEX('thing', MANY(CHAR('bcd'))));
-
-  check(g, a, 'bbb', 'bbb');
-  check(g, a, 'ccc', 'ccc');
-  check(g, a, 'ddd', 'ddd');
-  check(g, a, 'bad', null);  // a is outside range.
-  check(g, a, 'bed', null);  // e is outside range.
-}
-
-testC() {
-  // Curried tree builders.
-  binary(operation) => (second) => (first) => [operation, first, second];
-  unary(operation) => () => (first) => [operation, first];
-  reform(a, fns) {
-    var r = a;
-    for (var fn in fns)
-      r = fn(r);
-    return r;
-  }
-
-  Grammar g = new Grammar();
-
-  Symbol expression = g['expression'];
-  Symbol postfix_e = g['postfix_e'];
-  Symbol unary_e = g['unary_e'];
-  Symbol cast_e = g['cast_e'];
-  Symbol mult_e = g['mult_e'];
-  Symbol add_e = g['add_e'];
-  Symbol shift_e = g['shift_e'];
-  Symbol relational_e = g['relational_e'];
-  Symbol equality_e = g['equality_e'];
-  Symbol cond_e = g['cond_e'];
-  Symbol assignment_e = g['assignment_e'];
-
-  // Lexical elements.
-  var idStartChar = CHAR(
-      @"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz");
-  var idNextChar = CHAR(
-      @"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789$_");
-
-  var id = TEXT(LEX('identifier', [idStartChar, MANY(idNextChar, min: 0)]));
-
-  var lit = TEXT(LEX('literal', MANY(CHAR('0123456789'))));
-
-
-  var type_name = id;
-
-
-  // Expression grammar.
-  var primary_e = OR([id,
-                      lit,
-                      ['(', expression, ')', (e) => e]
-                      ]);
-
-  var postfixes = OR([['(', MANY(assignment_e, ',', 0), ')', binary('apply')],
-                      ['++', unary('postinc')],
-                      ['--', unary('postdec')],
-                      ['.', id, binary('field')],
-                      ['->', id, binary('ptr')],
-                      ]);
-
-  postfix_e.def = [primary_e, MANY(postfixes, min:0), reform];
-
-
-  var unary_op = OR([['&', () => 'address'],
-                     ['*', () => 'indir'],
-                     ['!', () => 'not'],
-                     ['~', () => 'not'],
-                     ['-', () => 'negate'],
-                     ['+', () => 'uplus'],
-                     ]);
-  var sizeof = LEX('sizeof', ['sizeof', NOT(idNextChar)]);
-
-  Symbol unary_e_plain = g['unary_e_plain'];
-  unary_e_plain.def =
-      OR([ ['++', unary_e, (e) => ['preinc', e]],
-           ['--', unary_e, (e) => ['predec', e]],
-           [unary_op, cast_e, (o, e) => [o, e]],
-           [sizeof, unary_e, (e) => ['sizeof-expr', e]],
-           [sizeof, '(', type_name , ')', (t) => ['sizeof-type', t]],
-           postfix_e
-           ]);
-
-  unary_e.def = MEMO(unary_e_plain);
-  //unary_e.def = unary_e_plain;
-
-  cast_e.def = OR([ ['(', type_name, ')', cast_e, (t, e) => ['cast', t, e]],
-                    unary_e,
-                         ]);
-
-  var mult_ops = OR([['*', cast_e, binary('mult')],
-                     ['/', cast_e, binary('div')],
-                     ['%', cast_e, binary('rem')],
-                     ]);
-  mult_e.def = [cast_e, MANY(mult_ops, min:0), reform];
-
-  var add_ops = OR([['+', mult_e, binary('add')],
-                    ['-', mult_e, binary('sub')],
-                    ]);
-  add_e.def = [mult_e, MANY(add_ops, min:0), reform];
-
-  var shift_ops = OR([['>>', add_e, binary('shl')],
-                      ['<<', add_e, binary('shr')],
-                      ]);
-  shift_e.def = [add_e, MANY(shift_ops, min:0), reform];
-
-  var relational_ops = OR([['<=', shift_e, binary('le')],
-                           ['>=', shift_e, binary('ge')],
-                           ['<', shift_e, binary('lt')],
-                           ['>', shift_e, binary('gt')],
-                           ]);
-  relational_e.def = [shift_e, MANY(relational_ops, min:0), reform];
-
-
-  var equality_ops = OR([['==', shift_e, binary('eq')],
-                         ['!=', shift_e, binary('ne')],
-                         ]);
-  equality_e.def = [relational_e, MANY(equality_ops, min:0), reform];
-
-
-  var bit_and_op = LEX('&', ['&', NOT('&')]);  // Don't see '&&' and '&', '&'
-  var bit_or_op = LEX('|', ['|', NOT('|')]);
-
-  var and_e = [equality_e, MANY([bit_and_op, equality_e, binary('bitand')], min:0), reform];
-  var xor_e = [and_e, MANY(['^', and_e, binary('bitxor')], min:0), reform];
-  var or_e = [xor_e, MANY([bit_or_op, xor_e, binary('bitor')], min:0), reform];
-
-  var log_and_e = [or_e, MANY(['&&', or_e, binary('and')], min:0), reform];
-
-  var log_or_e = [log_and_e, MANY(['||', log_and_e, binary('or')], min:0), reform];
-
-  //cond_e.def = OR([ [log_or_e, '?', expression, ':', cond_e,
-  //                   (p,a,b) => ['cond', p, a, b]],
-  //                  log_or_e]);
-  // Alternate version avoids reparsing log_or_e.
-  cond_e.def = [log_or_e, MAYBE(['?', expression, ':', cond_e]),
-                (p, r) => r == null || r == false ? p : ['cond', p, r[0], r[1]]];
-
-  var assign_op = OR([['*=', () => 'mulassign'],
-                      ['=', () => 'assign']]);
-
-  // TODO: Figure out how not to re-parse a unary_e.
-  // Order matters - cond_e can't go first since cond_e will succeed on, e.g. 'a'.
-  assignment_e.def = OR([[unary_e, assign_op, assignment_e,
-                          (u, op, a) => [op, u, a]],
-                         cond_e]);
-
-  expression.def = [assignment_e,
-                    MANY([',', assignment_e, binary('comma')], min:0),
-                    reform];
-
-  show(g, expression, 'a');
-  check(g, expression, 'a', 'a');
-  check(g, expression, '(a)', 'a');
-  check(g, expression, '  (  ( a ) ) ', 'a');
-
-  check(g, expression, 'a(~1,2)',  '[apply,a,[[not,1],2]]');
-  check(g, expression, 'a(1)(x,2)', '[apply,[apply,a,[1]],[x,2]]');
-  check(g, expression, 'a(1,2())', '[apply,a,[1,[apply,2,[]]]]');
-
-  check(g, expression, '++a++', '[preinc,[postinc,a]]');
-  check(g, expression, 'a++++b', null);
-  check(g, expression, 'a++ ++b', null);
-  check(g, expression, 'a+ +++b', '[add,a,[preinc,[uplus,b]]]');
-  check(g, expression, 'a+ + ++b', '[add,a,[uplus,[preinc,b]]]');
-  check(g, expression, 'a+ + + +b', '[add,a,[uplus,[uplus,[uplus,b]]]]');
-  check(g, expression, 'a+ ++ +b', '[add,a,[preinc,[uplus,b]]]');
-  check(g, expression, 'a++ + +b', '[add,[postinc,a],[uplus,b]]');
-  check(g, expression, 'a+++ +b', '[add,[postinc,a],[uplus,b]]');
-
-  check(g, expression, '((T)f)(x)', '[apply,[cast,T,f],[x]]');
-  check(g, expression, '(T)f(x)', '[cast,T,[apply,f,[x]]]');
-
-  check(g, expression, 'a++*++b', '[mult,[postinc,a],[preinc,b]]');
-
-  check(g, expression, 'a<<1>>++b', '[shl,[shr,a,1],[preinc,b]]');
-
-  check(g, expression, 'a<1&&b', '[and,[lt,a,1],b]');
-
-  check(g, expression, 'a<1 & &b', '[bitand,[lt,a,1],[address,b]]');
-  check(g, expression,
-        'a ? b ? c : d : e ? f : g',
-        '[cond,a,[cond,b,c,d],[cond,e,f,g]]');
-
-  check(g, expression, 'a,b,c', '[comma,[comma,a,b],c]');
-  check(g, expression, 'a=1,b,c', '[comma,[comma,[assign,a,1],b],c]');
-
-  check(g, expression,
-        '((((((((((((a))))))))))))=1,b,c', '[comma,[comma,[assign,a,1],b],c]');
-
-  check(g, expression, 'sizeof a', '[sizeof-expr,a]');
-  check(g, expression, 'sizeofa', 'sizeofa');
-  check(g, expression, 'sizeof (a)', '[sizeof-expr,a]');
-}
-
-
-show(grammar, rule, input) {
-  print('show: "$input"');
-  var ast;
-  try {
-    ast = grammar.parse(rule, input);
-  } catch (var exception) {
-    if (exception is ParseError)
-      ast = exception;
-    else
-      throw;
-  }
-  print('${printList(ast)}');
-}
-
-void check(grammar, rule, input, expected) {
-  // If [expected] is String then the result is coerced to string.
-  // If [expected] is !String, the result is compared directly.
-  print('check: "$input"');
-  var ast;
-  try {
-    ast = grammar.parse(rule, input);
-  } catch (var exception) {
-    ast = exception;
-  }
-
-  var formatted = ast;
-  if (expected is String)
-    formatted = printList(ast);
-
-  Expect.equals(expected, formatted, "parse: $input");
-}
-
-// Prints the list in [1,2,3] notation, including nested lists.
-void printList(item) {
-  if (item is List) {
-    StringBuffer sb = new StringBuffer();
-    sb.add('[');
-    var sep = '';
-    for (var x in item) {
-      sb.add(sep);
-      sb.add(printList(x));
-      sep = ',';
-    }
-    sb.add(']');
-    return sb.toString();
-  }
-  if (item == null)
-    return 'null';
-  return item.toString();
-}
-
-main() {
-  testCODE();
-  testParens();
-  testOR();
-  testTEXT();
-  testBlockComment();
-  testC();
-}