604 lines
19 KiB
JavaScript
604 lines
19 KiB
JavaScript
import {LooseParser} from "./state"
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import {isDummy} from "./parseutil"
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import {tokTypes as tt} from ".."
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const lp = LooseParser.prototype
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lp.checkLVal = function(expr) {
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if (!expr) return expr;
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switch (expr.type) {
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case "Identifier":
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case "MemberExpression":
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case "ObjectPattern":
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case "ArrayPattern":
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case "RestElement":
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case "AssignmentPattern":
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return expr;
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default:
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return this.dummyIdent();
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}
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};
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lp.parseExpression = function(noIn) {
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var start = this.storeCurrentPos();
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var expr = this.parseMaybeAssign(noIn);
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if (this.tok.type === tt.comma) {
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var node = this.startNodeAt(start);
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node.expressions = [expr];
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while (this.eat(tt.comma)) node.expressions.push(this.parseMaybeAssign(noIn));
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return this.finishNode(node, "SequenceExpression");
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}
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return expr;
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};
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lp.parseParenExpression = function() {
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this.pushCx();
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this.expect(tt.parenL);
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var val = this.parseExpression();
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this.popCx();
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this.expect(tt.parenR);
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return val;
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};
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lp.parseMaybeAssign = function(noIn) {
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var start = this.storeCurrentPos();
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var left = this.parseMaybeConditional(noIn);
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if (this.tok.type.isAssign) {
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var node = this.startNodeAt(start);
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node.operator = this.tok.value;
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node.left = this.tok.type === tt.eq ? this.toAssignable(left) : this.checkLVal(left);
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this.next();
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node.right = this.parseMaybeAssign(noIn);
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return this.finishNode(node, "AssignmentExpression");
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}
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return left;
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};
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lp.parseMaybeConditional = function(noIn) {
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var start = this.storeCurrentPos();
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var expr = this.parseExprOps(noIn);
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if (this.eat(tt.question)) {
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var node = this.startNodeAt(start);
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node.test = expr;
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node.consequent = this.parseMaybeAssign();
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node.alternate = this.expect(tt.colon) ? this.parseMaybeAssign(noIn) : this.dummyIdent();
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return this.finishNode(node, "ConditionalExpression");
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}
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return expr;
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};
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lp.parseExprOps = function(noIn) {
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var start = this.storeCurrentPos();
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var indent = this.curIndent, line = this.curLineStart;
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return this.parseExprOp(this.parseMaybeUnary(noIn), start, -1, noIn, indent, line);
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};
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lp.parseExprOp = function(left, start, minPrec, noIn, indent, line) {
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if (this.curLineStart != line && this.curIndent < indent && this.tokenStartsLine()) return left;
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var prec = this.tok.type.binop;
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if (prec != null && (!noIn || this.tok.type !== tt._in)) {
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if (prec > minPrec) {
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var node = this.startNodeAt(start);
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node.left = left;
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node.operator = this.tok.value;
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this.next();
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if (this.curLineStart != line && this.curIndent < indent && this.tokenStartsLine()) {
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node.right = this.dummyIdent();
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} else {
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var rightStart = this.storeCurrentPos();
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node.right = this.parseExprOp(this.parseMaybeUnary(noIn), rightStart, prec, noIn, indent, line);
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}
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this.finishNode(node, /&&|\|\|/.test(node.operator) ? "LogicalExpression" : "BinaryExpression");
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return this.parseExprOp(node, start, minPrec, noIn, indent, line);
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}
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}
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return left;
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};
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lp.parseMaybeUnary = function(noIn) {
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if (this.tok.type.prefix) {
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var node = this.startNode(), update = this.tok.type === tt.incDec;
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node.operator = this.tok.value;
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node.prefix = true;
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this.next();
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node.argument = this.parseMaybeUnary(noIn);
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if (update) node.argument = this.checkLVal(node.argument);
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return this.finishNode(node, update ? "UpdateExpression" : "UnaryExpression");
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} else if (this.tok.type === tt.ellipsis) {
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var node = this.startNode();
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this.next();
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node.argument = this.parseMaybeUnary(noIn);
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return this.finishNode(node, "SpreadElement");
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}
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var start = this.storeCurrentPos();
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var expr = this.parseExprSubscripts();
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while (this.tok.type.postfix && !this.canInsertSemicolon()) {
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var node = this.startNodeAt(start);
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node.operator = this.tok.value;
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node.prefix = false;
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node.argument = this.checkLVal(expr);
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this.next();
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expr = this.finishNode(node, "UpdateExpression");
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}
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return expr;
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};
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lp.parseExprSubscripts = function() {
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var start = this.storeCurrentPos();
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return this.parseSubscripts(this.parseExprAtom(), start, false, this.curIndent, this.curLineStart);
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};
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lp.parseSubscripts = function(base, start, noCalls, startIndent, line) {
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for (;;) {
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if (this.curLineStart != line && this.curIndent <= startIndent && this.tokenStartsLine()) {
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if (this.tok.type == tt.dot && this.curIndent == startIndent)
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--startIndent;
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else
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return base;
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}
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if (this.eat(tt.dot)) {
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var node = this.startNodeAt(start);
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node.object = base;
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if (this.curLineStart != line && this.curIndent <= startIndent && this.tokenStartsLine())
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node.property = this.dummyIdent();
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else
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node.property = this.parsePropertyAccessor() || this.dummyIdent();
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node.computed = false;
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base = this.finishNode(node, "MemberExpression");
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} else if (this.tok.type == tt.bracketL) {
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this.pushCx();
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this.next();
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var node = this.startNodeAt(start);
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node.object = base;
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node.property = this.parseExpression();
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node.computed = true;
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this.popCx();
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this.expect(tt.bracketR);
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base = this.finishNode(node, "MemberExpression");
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} else if (!noCalls && this.tok.type == tt.parenL) {
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this.pushCx();
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var node = this.startNodeAt(start);
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node.callee = base;
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node.arguments = this.parseExprList(tt.parenR);
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base = this.finishNode(node, "CallExpression");
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} else if (this.tok.type == tt.backQuote) {
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var node = this.startNodeAt(start);
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node.tag = base;
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node.quasi = this.parseTemplate();
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base = this.finishNode(node, "TaggedTemplateExpression");
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} else {
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return base;
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}
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}
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};
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lp.parseExprAtom = function() {
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switch (this.tok.type) {
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case tt._this:
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case tt._super:
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var type = this.tok.type === tt._this ? "ThisExpression" : "SuperExpression";
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var node = this.startNode();
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this.next();
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return this.finishNode(node, type);
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case tt.name:
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var start = this.storeCurrentPos();
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var id = this.parseIdent();
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return this.eat(tt.arrow) ? this.parseArrowExpression(this.startNodeAt(start), [id]) : id;
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case tt.regexp:
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var node = this.startNode();
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var val = this.tok.value;
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node.regex = {pattern: val.pattern, flags: val.flags};
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node.value = val.value;
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node.raw = this.input.slice(this.tok.start, this.tok.end);
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this.next();
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return this.finishNode(node, "Literal");
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case tt.num: case tt.string:
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var node = this.startNode();
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node.value = this.tok.value;
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node.raw = this.input.slice(this.tok.start, this.tok.end);
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this.next();
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return this.finishNode(node, "Literal");
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case tt._null: case tt._true: case tt._false:
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var node = this.startNode();
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node.value = this.tok.type === tt._null ? null : this.tok.type === tt._true;
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node.raw = this.tok.type.keyword;
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this.next();
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return this.finishNode(node, "Literal");
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case tt.parenL:
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var start = this.storeCurrentPos();
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this.next();
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var val = this.parseExpression();
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this.expect(tt.parenR);
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if (this.eat(tt.arrow)) {
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return this.parseArrowExpression(this.startNodeAt(start), val.expressions || (isDummy(val) ? [] : [val]));
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}
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if (this.options.preserveParens) {
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var par = this.startNodeAt(start);
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par.expression = val;
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val = this.finishNode(par, "ParenthesizedExpression");
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}
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return val;
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case tt.bracketL:
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var node = this.startNode();
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this.pushCx();
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node.elements = this.parseExprList(tt.bracketR, true);
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return this.finishNode(node, "ArrayExpression");
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case tt.braceL:
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return this.parseObj();
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case tt._class:
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return this.parseClass();
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case tt._function:
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var node = this.startNode();
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this.next();
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return this.parseFunction(node, false);
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case tt._new:
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return this.parseNew();
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case tt._yield:
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var node = this.startNode();
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this.next();
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if (this.semicolon() || this.canInsertSemicolon() || (this.tok.type != tt.star && !this.tok.type.startsExpr)) {
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node.delegate = false;
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node.argument = null;
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} else {
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node.delegate = this.eat(tt.star);
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node.argument = this.parseMaybeAssign();
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}
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return this.finishNode(node, "YieldExpression");
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case tt.backQuote:
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return this.parseTemplate();
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default:
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return this.dummyIdent();
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}
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};
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lp.parseNew = function() {
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var node = this.startNode(), startIndent = this.curIndent, line = this.curLineStart;
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this.next();
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var start = this.storeCurrentPos();
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node.callee = this.parseSubscripts(this.parseExprAtom(), start, true, startIndent, line);
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if (this.tok.type == tt.parenL) {
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this.pushCx();
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node.arguments = this.parseExprList(tt.parenR);
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} else {
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node.arguments = [];
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}
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return this.finishNode(node, "NewExpression");
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};
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lp.parseTemplateElement = function() {
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var elem = this.startNode();
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elem.value = {
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raw: this.input.slice(this.tok.start, this.tok.end),
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cooked: this.tok.value
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};
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this.next();
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elem.tail = this.tok.type === tt.backQuote;
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return this.finishNode(elem, "TemplateElement");
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};
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lp.parseTemplate = function() {
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var node = this.startNode();
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this.next();
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node.expressions = [];
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var curElt = this.parseTemplateElement();
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node.quasis = [curElt];
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while (!curElt.tail) {
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this.next();
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node.expressions.push(this.parseExpression());
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if (this.expect(tt.braceR)) {
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curElt = this.parseTemplateElement();
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} else {
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curElt = this.startNode();
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curElt.value = {cooked: '', raw: ''};
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curElt.tail = true;
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}
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node.quasis.push(curElt);
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}
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this.expect(tt.backQuote);
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return this.finishNode(node, "TemplateLiteral");
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};
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lp.parseObj = function() {
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var node = this.startNode();
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node.properties = [];
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this.pushCx();
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var indent = this.curIndent + 1, line = this.curLineStart;
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this.eat(tt.braceL);
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if (this.curIndent + 1 < indent) { indent = this.curIndent; line = this.curLineStart; }
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while (!this.closes(tt.braceR, indent, line)) {
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var prop = this.startNode(), isGenerator, start;
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if (this.options.ecmaVersion >= 6) {
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start = this.storeCurrentPos();
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prop.method = false;
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prop.shorthand = false;
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isGenerator = this.eat(tt.star);
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}
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this.parsePropertyName(prop);
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if (isDummy(prop.key)) { if (isDummy(this.parseMaybeAssign())) this.next(); this.eat(tt.comma); continue; }
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if (this.eat(tt.colon)) {
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prop.kind = "init";
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prop.value = this.parseMaybeAssign();
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} else if (this.options.ecmaVersion >= 6 && (this.tok.type === tt.parenL || this.tok.type === tt.braceL)) {
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prop.kind = "init";
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prop.method = true;
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prop.value = this.parseMethod(isGenerator);
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} else if (this.options.ecmaVersion >= 5 && prop.key.type === "Identifier" &&
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!prop.computed && (prop.key.name === "get" || prop.key.name === "set") &&
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(this.tok.type != tt.comma && this.tok.type != tt.braceR)) {
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prop.kind = prop.key.name;
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this.parsePropertyName(prop);
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prop.value = this.parseMethod(false);
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} else {
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prop.kind = "init";
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if (this.options.ecmaVersion >= 6) {
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if (this.eat(tt.eq)) {
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var assign = this.startNodeAt(start);
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assign.operator = "=";
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assign.left = prop.key;
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assign.right = this.parseMaybeAssign();
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prop.value = this.finishNode(assign, "AssignmentExpression");
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} else {
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prop.value = prop.key;
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}
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} else {
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prop.value = this.dummyIdent();
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}
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prop.shorthand = true;
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}
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node.properties.push(this.finishNode(prop, "Property"));
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this.eat(tt.comma);
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}
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this.popCx();
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if (!this.eat(tt.braceR)) {
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// If there is no closing brace, make the node span to the start
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// of the next token (this is useful for Tern)
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this.last.end = this.tok.start;
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if (this.options.locations) this.last.loc.end = this.tok.loc.start;
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}
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return this.finishNode(node, "ObjectExpression");
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};
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lp.parsePropertyName = function(prop) {
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if (this.options.ecmaVersion >= 6) {
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if (this.eat(tt.bracketL)) {
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prop.computed = true;
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prop.key = this.parseExpression();
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this.expect(tt.bracketR);
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return;
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} else {
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prop.computed = false;
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}
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}
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var key = (this.tok.type === tt.num || this.tok.type === tt.string) ? this.parseExprAtom() : this.parseIdent();
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prop.key = key || this.dummyIdent();
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};
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lp.parsePropertyAccessor = function() {
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if (this.tok.type === tt.name || this.tok.type.keyword) return this.parseIdent();
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};
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lp.parseIdent = function() {
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var node = this.startNode();
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node.name = this.tok.type === tt.name ? this.tok.value : this.tok.type.keyword;
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this.next();
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return this.finishNode(node, "Identifier");
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};
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lp.initFunction = function(node) {
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node.id = null;
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node.params = [];
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if (this.options.ecmaVersion >= 6) {
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node.generator = false;
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node.expression = false;
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}
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};
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// Convert existing expression atom to assignable pattern
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// if possible.
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lp.toAssignable = function(node) {
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if (this.options.ecmaVersion >= 6 && node) {
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switch (node.type) {
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case "ObjectExpression":
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node.type = "ObjectPattern";
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var props = node.properties;
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for (var i = 0; i < props.length; i++)
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this.toAssignable(props[i].value);
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break;
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case "ArrayExpression":
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node.type = "ArrayPattern";
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this.toAssignableList(node.elements);
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break;
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case "SpreadElement":
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node.type = "RestElement";
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node.argument = this.toAssignable(node.argument);
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break;
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case "AssignmentExpression":
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node.type = "AssignmentPattern";
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break;
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}
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}
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return this.checkLVal(node);
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};
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lp.toAssignableList = function(exprList) {
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for (var i = 0; i < exprList.length; i++)
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this.toAssignable(exprList[i]);
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return exprList;
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};
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lp.parseFunctionParams = function(params) {
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this.pushCx();
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params = this.parseExprList(tt.parenR);
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return this.toAssignableList(params);
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};
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lp.parseMethod = function(isGenerator) {
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var node = this.startNode();
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this.initFunction(node);
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node.params = this.parseFunctionParams();
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node.generator = isGenerator || false;
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node.expression = this.options.ecmaVersion >= 6 && this.tok.type !== tt.braceL;
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node.body = node.expression ? this.parseMaybeAssign() : this.parseBlock();
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return this.finishNode(node, "FunctionExpression");
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};
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lp.parseArrowExpression = function(node, params) {
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this.initFunction(node);
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node.params = this.toAssignableList(params);
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node.expression = this.tok.type !== tt.braceL;
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node.body = node.expression ? this.parseMaybeAssign() : this.parseBlock();
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return this.finishNode(node, "ArrowFunctionExpression");
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};
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lp.parseExport = function() {
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var node = this.startNode();
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this.next();
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if (this.eat(tt.star)) {
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node.source = this.eatContextual("from") ? this.parseExprAtom() : null;
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return this.finishNode(node, "ExportAllDeclaration");
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}
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if (this.eat(tt._default)) {
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var expr = this.parseMaybeAssign();
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if (expr.id) {
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switch (expr.type) {
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case "FunctionExpression": expr.type = "FunctionDeclaration"; break;
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case "ClassExpression": expr.type = "ClassDeclaration"; break;
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}
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}
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node.declaration = expr;
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this.semicolon();
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return this.finishNode(node, "ExportDefaultDeclaration");
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}
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if (this.tok.type.keyword) {
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node.declaration = this.parseStatement();
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node.specifiers = [];
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node.source = null;
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} else {
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node.declaration = null;
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node.specifiers = this.parseExportSpecifierList();
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node.source = this.eatContextual("from") ? this.parseExprAtom() : null;
|
|
this.semicolon();
|
|
}
|
|
return this.finishNode(node, "ExportNamedDeclaration");
|
|
};
|
|
|
|
lp.parseImport = function() {
|
|
var node = this.startNode();
|
|
this.next();
|
|
if (this.tok.type === tt.string) {
|
|
node.specifiers = [];
|
|
node.source = this.parseExprAtom();
|
|
node.kind = '';
|
|
} else {
|
|
if (this.tok.type === tt.name && this.tok.value !== "from") {
|
|
var elt = this.startNode();
|
|
elt.local = this.parseIdent();
|
|
this.finishNode(elt, "ImportDefaultSpecifier");
|
|
this.eat(tt.comma);
|
|
}
|
|
node.specifiers = this.parseImportSpecifierList();
|
|
node.source = this.eatContextual("from") ? this.parseExprAtom() : null;
|
|
if (elt) node.specifiers.unshift(elt);
|
|
}
|
|
this.semicolon();
|
|
return this.finishNode(node, "ImportDeclaration");
|
|
};
|
|
|
|
lp.parseImportSpecifierList = function() {
|
|
var elts = [];
|
|
if (this.tok.type === tt.star) {
|
|
var elt = this.startNode();
|
|
this.next();
|
|
if (this.eatContextual("as")) elt.local = this.parseIdent();
|
|
elts.push(this.finishNode(elt, "ImportNamespaceSpecifier"));
|
|
} else {
|
|
var indent = this.curIndent, line = this.curLineStart, continuedLine = this.nextLineStart;
|
|
this.pushCx();
|
|
this.eat(tt.braceL);
|
|
if (this.curLineStart > continuedLine) continuedLine = this.curLineStart;
|
|
while (!this.closes(tt.braceR, indent + (this.curLineStart <= continuedLine ? 1 : 0), line)) {
|
|
var elt = this.startNode();
|
|
if (this.eat(tt.star)) {
|
|
if (this.eatContextual("as")) elt.local = this.parseIdent();
|
|
this.finishNode(elt, "ImportNamespaceSpecifier");
|
|
} else {
|
|
if (this.isContextual("from")) break;
|
|
elt.imported = this.parseIdent();
|
|
elt.local = this.eatContextual("as") ? this.parseIdent() : elt.imported;
|
|
this.finishNode(elt, "ImportSpecifier");
|
|
}
|
|
elts.push(elt);
|
|
this.eat(tt.comma);
|
|
}
|
|
this.eat(tt.braceR);
|
|
this.popCx();
|
|
}
|
|
return elts;
|
|
};
|
|
|
|
lp.parseExportSpecifierList = function() {
|
|
var elts = [];
|
|
var indent = this.curIndent, line = this.curLineStart, continuedLine = this.nextLineStart;
|
|
this.pushCx();
|
|
this.eat(tt.braceL);
|
|
if (this.curLineStart > continuedLine) continuedLine = this.curLineStart;
|
|
while (!this.closes(tt.braceR, indent + (this.curLineStart <= continuedLine ? 1 : 0), line)) {
|
|
if (this.isContextual("from")) break;
|
|
var elt = this.startNode();
|
|
elt.local = this.parseIdent();
|
|
elt.exported = this.eatContextual("as") ? this.parseIdent() : elt.local;
|
|
this.finishNode(elt, "ExportSpecifier");
|
|
elts.push(elt);
|
|
this.eat(tt.comma);
|
|
}
|
|
this.eat(tt.braceR);
|
|
this.popCx();
|
|
return elts;
|
|
};
|
|
|
|
lp.parseExprList = function(close, allowEmpty) {
|
|
var indent = this.curIndent, line = this.curLineStart, elts = [];
|
|
this.next(); // Opening bracket
|
|
while (!this.closes(close, indent + 1, line)) {
|
|
if (this.eat(tt.comma)) {
|
|
elts.push(allowEmpty ? null : this.dummyIdent());
|
|
continue;
|
|
}
|
|
var elt = this.parseMaybeAssign();
|
|
if (isDummy(elt)) {
|
|
if (this.closes(close, indent, line)) break;
|
|
this.next();
|
|
} else {
|
|
elts.push(elt);
|
|
}
|
|
this.eat(tt.comma);
|
|
}
|
|
this.popCx();
|
|
if (!this.eat(close)) {
|
|
// If there is no closing brace, make the node span to the start
|
|
// of the next token (this is useful for Tern)
|
|
this.last.end = this.tok.start;
|
|
if (this.options.locations) this.last.loc.end = this.tok.loc.start;
|
|
}
|
|
return elts;
|
|
};
|