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Reserve _i and _n as names we often want to generate

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This commit is contained in:
Cyrus Najmabadi 2015-03-13 16:45:58 -07:00
parent 5e85595df6
commit 285497edf8
3 changed files with 56 additions and 49 deletions
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39
src/compiler/emitter.ts
View File

@ -2116,16 +2116,23 @@ module ts {
// Create a temporary variable with a unique unused name. The forLoopVariable parameter signals that the
// name should be one that is appropriate for a for loop variable.
function createTempVariable(location: Node, forLoopVariable?: boolean): Identifier {
let name = forLoopVariable ? "_i" : undefined;
while (true) {
if (name && !isExistingName(location, name)) {
break;
}
function createTempVariable(location: Node, preferredName?: string): Identifier {
let name = preferredName;
for ( ; !name || isExistingName(location, name); tempCount++) {
// _a .. _h, _j ... _z, _0, _1, ...
// Note that _i is skipped
name = "_" + (tempCount < 25 ? String.fromCharCode(tempCount + (tempCount < 8 ? 0 : 1) + CharacterCodes.a) : tempCount - 25);
tempCount++;
// Note: we avoid generating _i and _n as those are common names we want in other places.
var char = CharacterCodes.a + tempCount;
if (char === CharacterCodes.i || char === CharacterCodes.n) {
continue;
}
if (tempCount < 26) {
name = "_" + String.fromCharCode(char);
}
else {
name = "_" + (tempCount - 26);
}
}
// This is necessary so that a name generated via renameNonTopLevelLetAndConst will see the name
@ -2144,8 +2151,8 @@ module ts {
tempVariables.push(name);
}
function createAndRecordTempVariable(location: Node): Identifier {
let temp = createTempVariable(location, /*forLoopVariable*/ false);
function createAndRecordTempVariable(location: Node, preferredName?: string): Identifier {
let temp = createTempVariable(location, preferredName);
recordTempDeclaration(temp);
return temp;
@ -3580,10 +3587,10 @@ module ts {
//
// we don't want to emit a temporary variable for the RHS, just use it directly.
let rhsIsIdentifier = node.expression.kind === SyntaxKind.Identifier;
let counter = createTempVariable(node, /*forLoopVariable*/ true);
let rhsReference = rhsIsIdentifier ? <Identifier>node.expression : createTempVariable(node, /*forLoopVariable*/ false);
let counter = createTempVariable(node, /*preferredName*/ "_i");
let rhsReference = rhsIsIdentifier ? <Identifier>node.expression : createTempVariable(node);
var cachedLength = compilerOptions.cacheDownlevelForOfLength ? createTempVariable(node, /*forLoopVariable:*/ false) : undefined;
var cachedLength = compilerOptions.cacheDownlevelForOfLength ? createTempVariable(node, /*preferredName:*/ "_n") : undefined;
// This is the let keyword for the counter and rhsReference. The let keyword for
// the LHS will be emitted inside the body.
@ -3668,7 +3675,7 @@ module ts {
else {
// It's an empty declaration list. This can only happen in an error case, if the user wrote
// for (let of []) {}
emitNodeWithoutSourceMap(createTempVariable(node, /*forLoopVariable*/ false));
emitNodeWithoutSourceMap(createTempVariable(node));
write(" = ");
emitNodeWithoutSourceMap(rhsIterationValue);
}
@ -4251,7 +4258,7 @@ module ts {
if (languageVersion < ScriptTarget.ES6 && hasRestParameters(node)) {
let restIndex = node.parameters.length - 1;
let restParam = node.parameters[restIndex];
let tempName = createTempVariable(node, /*forLoopVariable*/ true).text;
let tempName = createTempVariable(node, /*preferredName:*/ "_i").text;
writeLine();
emitLeadingComments(restParam);
emitStart(restParam);

44
tests/baselines/reference/taggedTemplateStringsTypeArgumentInference.js
View File

@ -145,23 +145,16 @@ function someGenerics4(strs, n, f) {
// 2 parameter generic tag with argument 2 of type parameter type and argument 1 of function type whose parameter is of type parameter type
function someGenerics5(strs, n, f) {
}
(_n = ["", " ", ""], _n.raw = ["", " ", ""], someGenerics5(_n, 4, function () {
(_o = ["", " ", ""], _o.raw = ["", " ", ""], someGenerics5(_o, 4, function () {
return null;
}));
(_o = ["", "", ""], _o.raw = ["", "", ""], someGenerics5(_o, '', function () {
(_p = ["", "", ""], _p.raw = ["", "", ""], someGenerics5(_p, '', function () {
return 3;
}));
(_p = ["", "", ""], _p.raw = ["", "", ""], someGenerics5(_p, null, null));
(_q = ["", "", ""], _q.raw = ["", "", ""], someGenerics5(_q, null, null));
// Generic tag with multiple arguments of function types that each have parameters of the same generic type
function someGenerics6(strs, a, b, c) {
}
(_q = ["", "", "", ""], _q.raw = ["", "", "", ""], someGenerics6(_q, function (n) {
return n;
}, function (n) {
return n;
}, function (n) {
return n;
}));
(_r = ["", "", "", ""], _r.raw = ["", "", "", ""], someGenerics6(_r, function (n) {
return n;
}, function (n) {
@ -176,16 +169,16 @@ function someGenerics6(strs, a, b, c) {
}, function (n) {
return n;
}));
// Generic tag with multiple arguments of function types that each have parameters of different generic type
function someGenerics7(strs, a, b, c) {
}
(_t = ["", "", "", ""], _t.raw = ["", "", "", ""], someGenerics7(_t, function (n) {
(_t = ["", "", "", ""], _t.raw = ["", "", "", ""], someGenerics6(_t, function (n) {
return n;
}, function (n) {
return n;
}, function (n) {
return n;
}));
// Generic tag with multiple arguments of function types that each have parameters of different generic type
function someGenerics7(strs, a, b, c) {
}
(_u = ["", "", "", ""], _u.raw = ["", "", "", ""], someGenerics7(_u, function (n) {
return n;
}, function (n) {
@ -200,19 +193,26 @@ function someGenerics7(strs, a, b, c) {
}, function (n) {
return n;
}));
(_w = ["", "", "", ""], _w.raw = ["", "", "", ""], someGenerics7(_w, function (n) {
return n;
}, function (n) {
return n;
}, function (n) {
return n;
}));
// Generic tag with argument of generic function type
function someGenerics8(strs, n) {
return n;
}
var x = (_w = ["", ""], _w.raw = ["", ""], someGenerics8(_w, someGenerics7));
(_x = ["", "", "", ""], _x.raw = ["", "", "", ""], x(_x, null, null, null));
var x = (_x = ["", ""], _x.raw = ["", ""], someGenerics8(_x, someGenerics7));
(_y = ["", "", "", ""], _y.raw = ["", "", "", ""], x(_y, null, null, null));
// Generic tag with multiple parameters of generic type passed arguments with no best common type
function someGenerics9(strs, a, b, c) {
return null;
}
var a9a = (_y = ["", "", "", ""], _y.raw = ["", "", "", ""], someGenerics9(_y, '', 0, []));
var a9a = (_z = ["", "", "", ""], _z.raw = ["", "", "", ""], someGenerics9(_z, '', 0, []));
var a9a;
var a9e = (_z = ["", "", "", ""], _z.raw = ["", "", "", ""], someGenerics9(_z, undefined, {
var a9e = (_0 = ["", "", "", ""], _0.raw = ["", "", "", ""], someGenerics9(_0, undefined, {
x: 6,
z: new Date()
}, {
@ -221,7 +221,7 @@ var a9e = (_z = ["", "", "", ""], _z.raw = ["", "", "", ""], someGenerics9(_z, u
}));
var a9e;
// Generic tag with multiple parameters of generic type passed arguments with a single best common type
var a9d = (_0 = ["", "", "", ""], _0.raw = ["", "", "", ""], someGenerics9(_0, {
var a9d = (_1 = ["", "", "", ""], _1.raw = ["", "", "", ""], someGenerics9(_1, {
x: 3
}, {
x: 6
@ -231,9 +231,9 @@ var a9d = (_0 = ["", "", "", ""], _0.raw = ["", "", "", ""], someGenerics9(_0, {
var a9d;
// Generic tag with multiple parameters of generic type where one argument is of type 'any'
var anyVar;
var a = (_1 = ["", "", "", ""], _1.raw = ["", "", "", ""], someGenerics9(_1, 7, anyVar, 4));
var a = (_2 = ["", "", "", ""], _2.raw = ["", "", "", ""], someGenerics9(_2, 7, anyVar, 4));
var a;
// Generic tag with multiple parameters of generic type where one argument is [] and the other is not 'any'
var arr = (_2 = ["", "", "", ""], _2.raw = ["", "", "", ""], someGenerics9(_2, [], null, undefined));
var arr = (_3 = ["", "", "", ""], _3.raw = ["", "", "", ""], someGenerics9(_3, [], null, undefined));
var arr;
var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k, _l, _m, _n, _o, _p, _q, _r, _s, _t, _u, _v, _w, _x, _y, _z, _0, _1, _2;
var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k, _l, _m, _o, _p, _q, _r, _s, _t, _u, _v, _w, _x, _y, _z, _0, _1, _2, _3;

22
tests/baselines/reference/taggedTemplateStringsWithOverloadResolution3.js
View File

@ -103,26 +103,26 @@ var s = (_k = ["", ""], _k.raw = ["", ""], fn3(_k, 4));
var s = (_l = ["", "", "", ""], _l.raw = ["", "", "", ""], fn3(_l, '', '', ''));
var n = (_m = ["", "", "", ""], _m.raw = ["", "", "", ""], fn3(_m, '', '', 3));
// Generic overloads with differing arity tagging with argument count that doesn't match any overload
(_n = [""], _n.raw = [""], fn3(_n)); // Error
(_o = [""], _o.raw = [""], fn3(_o)); // Error
function fn4() {
}
// Generic overloads with constraints tagged with types that satisfy the constraints
(_o = ["", "", ""], _o.raw = ["", "", ""], fn4(_o, '', 3));
(_p = ["", "", ""], _p.raw = ["", "", ""], fn4(_p, 3, ''));
(_q = ["", "", ""], _q.raw = ["", "", ""], fn4(_q, 3, undefined));
(_r = ["", "", ""], _r.raw = ["", "", ""], fn4(_r, '', null));
(_p = ["", "", ""], _p.raw = ["", "", ""], fn4(_p, '', 3));
(_q = ["", "", ""], _q.raw = ["", "", ""], fn4(_q, 3, ''));
(_r = ["", "", ""], _r.raw = ["", "", ""], fn4(_r, 3, undefined));
(_s = ["", "", ""], _s.raw = ["", "", ""], fn4(_s, '', null));
// Generic overloads with constraints called with type arguments that do not satisfy the constraints
(_s = ["", "", ""], _s.raw = ["", "", ""], fn4(_s, null, null)); // Error
(_t = ["", "", ""], _t.raw = ["", "", ""], fn4(_t, null, null)); // Error
// Generic overloads with constraints called without type arguments but with types that do not satisfy the constraints
(_t = ["", "", ""], _t.raw = ["", "", ""], fn4(_t, true, null));
(_u = ["", "", ""], _u.raw = ["", "", ""], fn4(_u, null, true));
(_u = ["", "", ""], _u.raw = ["", "", ""], fn4(_u, true, null));
(_v = ["", "", ""], _v.raw = ["", "", ""], fn4(_v, null, true));
function fn5() {
return undefined;
}
(_v = ["", ""], _v.raw = ["", ""], fn5(_v, function (n) {
(_w = ["", ""], _w.raw = ["", ""], fn5(_w, function (n) {
return n.toFixed();
})); // will error; 'n' should have type 'string'.
(_w = ["", ""], _w.raw = ["", ""], fn5(_w, function (n) {
(_x = ["", ""], _x.raw = ["", ""], fn5(_x, function (n) {
return n.substr(0);
}));
var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k, _l, _m, _n, _o, _p, _q, _r, _s, _t, _u, _v, _w;
var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k, _l, _m, _o, _p, _q, _r, _s, _t, _u, _v, _w, _x;