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refactor(Parser): cleanup

This commit is contained in:
vsavkin 2014-11-06 12:00:09 -08:00
parent cb276fe412
commit 90fd1a9227
4 changed files with 259 additions and 148 deletions
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3
modules/change_detection/src/parser/ast.js
View File

@ -326,6 +326,9 @@ export class FunctionCall extends AST {
eval(context) {
var obj = this.target.eval(context);
if (! (obj instanceof Function)) {
throw new BaseException(`${obj} is not a function`);
}
return FunctionWrapper.apply(obj, evalList(context, this.args));
}

5
modules/change_detection/src/parser/closure_map.es6
View File

@ -10,6 +10,9 @@ export class ClosureMap {
}
fn(name:string) {
return new Function('o', 'args', 'return o.' + name + '.apply(o, args);');
var method = `o.${name}`;
return new Function('o', 'args',
`if (!${method}) throw new Error('"${name}" is undefined');` +
`return ${method}.apply(o, args);`);
}
}

18
modules/change_detection/src/parser/parser.js
View File

@ -115,7 +115,7 @@ class _ParseAST {
expectIdentifierOrKeywordOrString():string {
var n = this.next;
if (!n.isIdentifier() && !n.isKeyword() && !n.isString()) {
this.error(`Unexpected token ${n}, expected identifier, or keyword, or string`)
this.error(`Unexpected token ${n}, expected identifier, keyword, or string`)
}
this.advance();
return n.toString();
@ -127,10 +127,13 @@ class _ParseAST {
var expr = this.parseFormatter();
ListWrapper.push(exprs, expr);
while (this.optionalCharacter($SEMICOLON)) {
if (this.optionalCharacter($SEMICOLON)) {
if (! this.parseAction) {
this.error("Binding expression cannot contain chained expression");
}
while (this.optionalCharacter($SEMICOLON)){} //read all semicolons
} else if (this.index < this.tokens.length) {
this.error(`Unexpected token '${this.next}'`);
}
}
return exprs.length == 1 ? exprs[0] : new Chain(exprs);
@ -163,6 +166,10 @@ class _ParseAST {
this.error(`Expression ${expression} is not assignable`);
}
if (!this.parseAction) {
this.error("Binding expression cannot contain assignments");
}
this.expectOperator('=');
result = new Assignment(result, this.parseConditional());
}
@ -303,7 +310,12 @@ class _ParseAST {
}
parsePrimary() {
if (this.next.isKeywordNull() || this.next.isKeywordUndefined()) {
if (this.optionalCharacter($LPAREN)) {
var result = this.parseFormatter();
this.expectCharacter($RPAREN);
return result;
} else if (this.next.isKeywordNull() || this.next.isKeywordUndefined()) {
this.advance();
return new LiteralPrimitive(null);

265
modules/change_detection/test/parser/parser_spec.js
View File

@ -1,4 +1,4 @@
import {ddescribe, describe, it, iit, expect, beforeEach} from 'test_lib/test_lib';
import {ddescribe, describe, it, xit, iit, expect, beforeEach} from 'test_lib/test_lib';
import {BaseException, isBlank} from 'facade/lang';
import {MapWrapper} from 'facade/collection';
import {Parser} from 'change_detection/parser/parser';
@ -22,12 +22,6 @@ class TestData {
}
}
class ContextWithErrors {
get boo() {
throw new BaseException("boo to you");
}
}
export function main() {
function td(a = 0, b = 0, fnReturnValue = "constant") {
return new TestData(a, b, fnReturnValue);
@ -56,19 +50,20 @@ export function main() {
describe("parser", () => {
describe("parseAction", () => {
it("should parse field access", () => {
expectEval("a", td(999)).toEqual(999);
expectEval("a.a", td(td(999))).toEqual(999);
});
it('should throw when accessing a field on null', () => {
expectEvalError("a.a.a").toThrowError();
});
describe("basic expressions", () => {
it('should parse numerical expressions', () => {
expectEval("1").toEqual(1);
});
it('should parse strings', () => {
expectEval("'1'").toEqual('1');
expectEval('"1"').toEqual('1');
});
it('should parse null', () => {
expectEval("null").toBe(null);
});
it('should parse unary - expressions', () => {
expectEval("-1").toEqual(-1);
expectEval("+1").toEqual(1);
@ -76,6 +71,7 @@ export function main() {
it('should parse unary ! expressions', () => {
expectEval("!true").toEqual(!true);
expectEval("!!true").toEqual(!!true);
});
it('should parse multiplicative expressions', () => {
@ -108,14 +104,16 @@ export function main() {
expectEval("false||false").toEqual(false || false);
});
it('should parse ternary/conditional expressions', () => {
expectEval("7==3+4?10:20").toEqual(10);
expectEval("false?10:20").toEqual(20);
it('should short-circuit AND operator', () => {
expectEval('false && a()', td(() => {throw "BOOM"})).toBe(false);
});
it('should throw on incorrect ternary operator syntax', () => {
expectEvalError("true?1").
toThrowError(new RegExp('Parser Error: Conditional expression true\\?1 requires all 3 expressions'));
it('should short-circuit OR operator', () => {
expectEval('true || a()', td(() => {throw "BOOM"})).toBe(true);
});
it('should evaluate grouped expressions', () => {
expectEval("(1+2)*3").toEqual((1+2)*3);
});
it('should auto convert ints to strings', () => {
@ -126,7 +124,7 @@ export function main() {
expectEval("'str ' + 4 + 4").toEqual("str 44");
});
it('should eval binary operators with null as null', () => {
it('should throw when one of the operands is null', () => {
expectEvalError("null < 0").toThrowError();
expectEvalError("null * 3").toThrowError();
expectEvalError("null + 6").toThrowError();
@ -136,65 +134,9 @@ export function main() {
expectEvalError("null + null").toThrowError();
expectEvalError("null - null").toThrowError();
});
it('should only allow identifier or keyword as member names', () => {
expect(() => parseAction("x.(")).toThrowError(new RegExp('identifier or keyword'));
expect(() => parseAction('x. 1234')).toThrowError(new RegExp('identifier or keyword'));
expect(() => parseAction('x."foo"')).toThrowError(new RegExp('identifier or keyword'));
});
it("should error when using formatters", () => {
expectEvalError('x|blah').toThrowError(new RegExp('Cannot have a formatter'));
});
it('should pass exceptions', () => {
expect(() => {
createParser().parseAction('boo').eval(new ContextWithErrors());
}).toThrowError('boo to you');
});
it('should evaluate assignments', () => {
var context = td();
expectEval("a=12", context).toEqual(12);
expect(context.a).toEqual(12);
context = td(td(td()));
expectEval("a.a.a=123;", context).toEqual(123);
expect(context.a.a.a).toEqual(123);
context = td();
expectEval("a=123; b=234", context).toEqual(234);
expect(context.a).toEqual(123);
expect(context.b).toEqual(234);
context = td([100]);
expectEval('a[0] = 200', context).toEqual(200);
expect(context.a[0]).toEqual(200);
context = td(MapWrapper.createFromPairs([["key", 100]]));
expectEval('a["key"] = 200', context).toEqual(200);
expect(MapWrapper.get(context.a, "key")).toEqual(200);
context = td([MapWrapper.createFromPairs([["key", 100]])]);
expectEval('a[0]["key"] = 200', context).toEqual(200);
expect(MapWrapper.get(context.a[0], "key")).toEqual(200);
});
it('should throw on bad assignment', () => {
expectEvalError("5=4").toThrowError(new RegExp("Expression 5 is not assignable"));
});
it("should evaluate method calls", () => {
expectEval("fn()", td(0,0, "constant")).toEqual("constant");
expectEval("add(1,2)").toEqual(3);
expectEval("a.add(1,2)", td(td())).toEqual(3);
expectEval("fn().add(1,2)", td(0,0,td())).toEqual(3);
});
it("should evaluate function calls", () => {
expectEval("fn()(1,2)", td(0, 0, (a,b) => a + b)).toEqual(3);
});
describe("literals", () => {
it('should evaluate array', () => {
expectEval("[1][0]").toEqual(1);
expectEval("[[1]][0][0]").toEqual(1);
@ -203,10 +145,6 @@ export function main() {
expectEval("[1, 2].length").toEqual(2);
});
it("should error when unfinished exception", () => {
expectEvalError('a[0').toThrowError(new RegExp("Missing expected ]"));
});
it('should evaluate map', () => {
expectEval("{}").toEqual(MapWrapper.create());
expectEval("{a:'b'}['a']").toEqual('b');
@ -217,23 +155,178 @@ export function main() {
expectEval("{\"a\":'b'}['invalid']").not.toBeDefined();
});
it('should only allow identifier, string, or keyword as map key', () => {
expectEvalError('{(:0}').toThrowError(new RegExp('expected identifier, keyword, or string'));
expectEvalError('{1234:0}').toThrowError(new RegExp('expected identifier, keyword, or string'));
});
});
describe("member access", () => {
it("should parse field access", () => {
expectEval("a", td(999)).toEqual(999);
expectEval("a.a", td(td(999))).toEqual(999);
});
it('should throw when accessing a field on null', () => {
expectEvalError("a.a.a").toThrowError();
});
it('should only allow identifier or keyword as member names', () => {
expectEvalError('x.(').toThrowError(new RegExp('identifier or keyword'));
expectEvalError('x. 1234').toThrowError(new RegExp('identifier or keyword'));
expectEvalError('x."foo"').toThrowError(new RegExp('identifier or keyword'));
});
});
describe("method calls", () => {
it("should evaluate method calls", () => {
expectEval("fn()", td(0, 0, "constant")).toEqual("constant");
expectEval("add(1,2)").toEqual(3);
expectEval("a.add(1,2)", td(td())).toEqual(3);
expectEval("fn().add(1,2)", td(0, 0, td())).toEqual(3);
});
it('should throw when no method', () => {
expectEvalError("blah()").toThrowError();
});
});
describe("functional calls", () => {
it("should evaluate function calls", () => {
expectEval("fn()(1,2)", td(0, 0, (a, b) => a + b)).toEqual(3);
});
it('should throw on non-function function calls', () => {
expectEvalError("4()").toThrowError(new RegExp('4 is not a function'));
});
it('should parse functions for object indices', () => {
expectEval('a[b()]()', td([()=>6], () => 0)).toEqual(6);
});
});
describe("conditional", () => {
it('should parse ternary/conditional expressions', () => {
expectEval("7==3+4?10:20").toEqual(10);
expectEval("false?10:20").toEqual(20);
});
it('should throw on incorrect ternary operator syntax', () => {
expectEvalError("true?1").
toThrowError(new RegExp('Parser Error: Conditional expression true\\?1 requires all 3 expressions'));
});
});
describe("assignment", () => {
it("should support field assignments", () => {
var context = td();
expectEval("a=12", context).toEqual(12);
expect(context.a).toEqual(12);
});
it("should support nested field assignments", () => {
var context = td(td(td()));
expectEval("a.a.a=123;", context).toEqual(123);
expect(context.a.a.a).toEqual(123);
});
it("should support multiple assignments", () => {
var context = td();
expectEval("a=123; b=234", context).toEqual(234);
expect(context.a).toEqual(123);
expect(context.b).toEqual(234);
});
it("should support array updates", () => {
var context = td([100]);
expectEval('a[0] = 200', context).toEqual(200);
expect(context.a[0]).toEqual(200);
});
it("should support map updates", () => {
var context = td(MapWrapper.createFromPairs([["key", 100]]));
expectEval('a["key"] = 200', context).toEqual(200);
expect(MapWrapper.get(context.a, "key")).toEqual(200);
});
it("should support array/map updates", () => {
var context = td([MapWrapper.createFromPairs([["key", 100]])]);
expectEval('a[0]["key"] = 200', context).toEqual(200);
expect(MapWrapper.get(context.a[0], "key")).toEqual(200);
});
it('should allow assignment after array dereference', () => {
var context = td([td()]);
expectEval('a[0].a = 200', context).toEqual(200);
expect(context.a[0].a).toEqual(200);
});
it('should throw on bad assignment', () => {
expectEvalError("5=4").toThrowError(new RegExp("Expression 5 is not assignable"));
});
});
describe("general error handling", () => {
it("should throw on an unexpected token", () => {
expectEvalError("[1,2] trac")
.toThrowError(new RegExp('Unexpected token \'trac\''));
});
it('should throw a reasonable error for unconsumed tokens', () => {
expectEvalError(")").toThrowError(new RegExp("Unexpected token \\) at column 1 in \\[\\)\\]"));
});
it('should throw on missing expected token', () => {
expectEvalError("a(b").toThrowError(new RegExp("Missing expected \\) at the end of the expression \\[a\\(b\\]"));
});
});
it("should error when using formatters", () => {
expectEvalError('x|blah').toThrowError(new RegExp('Cannot have a formatter'));
});
it('should pass exceptions', () => {
expect(() => {
createParser().parseAction('a()').eval(td(() => {throw new BaseException("boo to you")}));
}).toThrowError('boo to you');
});
describe("multiple statements", () => {
it("should return the last non-blank value", () => {
expectEval("a=1;b=3;a+b").toEqual(4);
expectEval("1;;").toEqual(1);
});
});
});
describe("parseBinding", () => {
it("should parse formatters", function () {
describe("formatters", () => {
it("should parse formatters", () => {
var exp = parseBinding("'Foo'|uppercase");
expect(exp).toBeAnInstanceOf(Formatter);
expect(exp.name).toEqual("uppercase");
});
it("should parse formatters with args", function () {
it("should parse formatters with args", () => {
var exp = parseBinding("1|increment:2");
expect(exp).toBeAnInstanceOf(Formatter);
expect(exp.name).toEqual("increment");
expect(exp.args[0]).toBeAnInstanceOf(LiteralPrimitive);
});
it('should only allow identifier or keyword as formatter names', () => {
expect(() => parseBinding('"Foo"|(')).toThrowError(new RegExp('identifier or keyword'));
expect(() => parseBinding('"Foo"|1234')).toThrowError(new RegExp('identifier or keyword'));
expect(() => parseBinding('"Foo"|"uppercase"')).toThrowError(new RegExp('identifier or keyword'));
});
});
it('should throw on chain expressions', () => {
expect(() => parseBinding("1;2")).toThrowError(new RegExp("contain chained expression"));
});
it('should throw on assignmnt', () => {
expect(() => parseBinding("1;2")).toThrowError(new RegExp("contain chained expression"));
});
});
});