(function (factory) {
    if (typeof module === "object" && typeof module.exports === "object") {
        var v = factory(require, exports);
        if (v !== undefined) module.exports = v;
    }
    else if (typeof define === "function" && define.amd) {
        define(["require", "exports", "./scssScanner", "./cssScanner", "./cssParser", "./cssNodes", "./scssErrors", "./cssErrors"], factory);
    }
})(function (require, exports) {
    /*---------------------------------------------------------------------------------------------
     *  Copyright (c) Microsoft Corporation. All rights reserved.
     *  Licensed under the MIT License. See License.txt in the project root for license information.
     *--------------------------------------------------------------------------------------------*/
    'use strict';
    Object.defineProperty(exports, "__esModule", { value: true });
    exports.SCSSParser = void 0;
    const scssScanner = require("./scssScanner");
    const cssScanner_1 = require("./cssScanner");
    const cssParser = require("./cssParser");
    const nodes = require("./cssNodes");
    const scssErrors_1 = require("./scssErrors");
    const cssErrors_1 = require("./cssErrors");
    /// <summary>
    /// A parser for scss
    /// http://sass-lang.com/documentation/file.SASS_REFERENCE.html
    /// </summary>
    class SCSSParser extends cssParser.Parser {
        constructor() {
            super(new scssScanner.SCSSScanner());
        }
        _parseStylesheetStatement(isNested = false) {
            if (this.peek(cssScanner_1.TokenType.AtKeyword)) {
                return this._parseWarnAndDebug() // @warn, @debug and @error statements
                    || this._parseControlStatement() // @if, @while, @for, @each
                    || this._parseMixinDeclaration() // @mixin
                    || this._parseMixinContent() // @content
                    || this._parseMixinReference() // @include
                    || this._parseFunctionDeclaration() // @function
                    || this._parseForward() // @forward
                    || this._parseUse() // @use
                    || this._parseRuleset(isNested) // @at-rule
                    || super._parseStylesheetAtStatement(isNested);
            }
            return this._parseRuleset(true) || this._parseVariableDeclaration();
        }
        _parseImport() {
            if (!this.peekKeyword('@import')) {
                return null;
            }
            const node = this.create(nodes.Import);
            this.consumeToken();
            if (!node.addChild(this._parseURILiteral()) && !node.addChild(this._parseStringLiteral())) {
                return this.finish(node, cssErrors_1.ParseError.URIOrStringExpected);
            }
            while (this.accept(cssScanner_1.TokenType.Comma)) {
                if (!node.addChild(this._parseURILiteral()) && !node.addChild(this._parseStringLiteral())) {
                    return this.finish(node, cssErrors_1.ParseError.URIOrStringExpected);
                }
            }
            if (!this.peek(cssScanner_1.TokenType.SemiColon) && !this.peek(cssScanner_1.TokenType.EOF)) {
                node.setMedialist(this._parseMediaQueryList());
            }
            return this.finish(node);
        }
        // scss variables: $font-size: 12px;
        _parseVariableDeclaration(panic = []) {
            if (!this.peek(scssScanner.VariableName)) {
                return null;
            }
            const node = this.create(nodes.VariableDeclaration);
            if (!node.setVariable(this._parseVariable())) {
                return null;
            }
            if (!this.accept(cssScanner_1.TokenType.Colon)) {
                return this.finish(node, cssErrors_1.ParseError.ColonExpected);
            }
            if (this.prevToken) {
                node.colonPosition = this.prevToken.offset;
            }
            if (!node.setValue(this._parseExpr())) {
                return this.finish(node, cssErrors_1.ParseError.VariableValueExpected, [], panic);
            }
            while (this.peek(cssScanner_1.TokenType.Exclamation)) {
                if (node.addChild(this._tryParsePrio())) {
                    // !important
                }
                else {
                    this.consumeToken();
                    if (!this.peekRegExp(cssScanner_1.TokenType.Ident, /^(default|global)$/)) {
                        return this.finish(node, cssErrors_1.ParseError.UnknownKeyword);
                    }
                    this.consumeToken();
                }
            }
            if (this.peek(cssScanner_1.TokenType.SemiColon)) {
                node.semicolonPosition = this.token.offset; // not part of the declaration, but useful information for code assist
            }
            return this.finish(node);
        }
        _parseMediaCondition() {
            return this._parseInterpolation() || super._parseMediaCondition();
        }
        _parseMediaFeatureName() {
            return this._parseModuleMember()
                || this._parseFunction() // function before ident
                || this._parseIdent()
                || this._parseVariable();
        }
        _parseKeyframeSelector() {
            return this._tryParseKeyframeSelector()
                || this._parseControlStatement(this._parseKeyframeSelector.bind(this))
                || this._parseVariableDeclaration()
                || this._parseMixinContent();
        }
        _parseVariable() {
            if (!this.peek(scssScanner.VariableName)) {
                return null;
            }
            const node = this.create(nodes.Variable);
            this.consumeToken();
            return node;
        }
        _parseModuleMember() {
            const pos = this.mark();
            const node = this.create(nodes.Module);
            if (!node.setIdentifier(this._parseIdent([nodes.ReferenceType.Module]))) {
                return null;
            }
            if (this.hasWhitespace()
                || !this.acceptDelim('.')
                || this.hasWhitespace()) {
                this.restoreAtMark(pos);
                return null;
            }
            if (!node.addChild(this._parseVariable() || this._parseFunction())) {
                return this.finish(node, cssErrors_1.ParseError.IdentifierOrVariableExpected);
            }
            return node;
        }
        _parseIdent(referenceTypes) {
            if (!this.peek(cssScanner_1.TokenType.Ident) && !this.peek(scssScanner.InterpolationFunction) && !this.peekDelim('-')) {
                return null;
            }
            const node = this.create(nodes.Identifier);
            node.referenceTypes = referenceTypes;
            node.isCustomProperty = this.peekRegExp(cssScanner_1.TokenType.Ident, /^--/);
            let hasContent = false;
            const indentInterpolation = () => {
                const pos = this.mark();
                if (this.acceptDelim('-')) {
                    if (!this.hasWhitespace()) {
                        this.acceptDelim('-');
                    }
                    if (this.hasWhitespace()) {
                        this.restoreAtMark(pos);
                        return null;
                    }
                }
                return this._parseInterpolation();
            };
            while (this.accept(cssScanner_1.TokenType.Ident) || node.addChild(indentInterpolation()) || (hasContent && this.acceptRegexp(/^[\w-]/))) {
                hasContent = true;
                if (this.hasWhitespace()) {
                    break;
                }
            }
            return hasContent ? this.finish(node) : null;
        }
        _parseTermExpression() {
            return this._parseModuleMember() ||
                this._parseVariable() ||
                this._parseSelectorCombinator() ||
                //this._tryParsePrio() ||
                super._parseTermExpression();
        }
        _parseInterpolation() {
            if (this.peek(scssScanner.InterpolationFunction)) {
                const node = this.create(nodes.Interpolation);
                this.consumeToken();
                if (!node.addChild(this._parseExpr()) && !this._parseSelectorCombinator()) {
                    if (this.accept(cssScanner_1.TokenType.CurlyR)) {
                        return this.finish(node);
                    }
                    return this.finish(node, cssErrors_1.ParseError.ExpressionExpected);
                }
                if (!this.accept(cssScanner_1.TokenType.CurlyR)) {
                    return this.finish(node, cssErrors_1.ParseError.RightCurlyExpected);
                }
                return this.finish(node);
            }
            return null;
        }
        _parseOperator() {
            if (this.peek(scssScanner.EqualsOperator) || this.peek(scssScanner.NotEqualsOperator)
                || this.peek(scssScanner.GreaterEqualsOperator) || this.peek(scssScanner.SmallerEqualsOperator)
                || this.peekDelim('>') || this.peekDelim('<')
                || this.peekIdent('and') || this.peekIdent('or')
                || this.peekDelim('%')) {
                const node = this.createNode(nodes.NodeType.Operator);
                this.consumeToken();
                return this.finish(node);
            }
            return super._parseOperator();
        }
        _parseUnaryOperator() {
            if (this.peekIdent('not')) {
                const node = this.create(nodes.Node);
                this.consumeToken();
                return this.finish(node);
            }
            return super._parseUnaryOperator();
        }
        _parseRuleSetDeclaration() {
            if (this.peek(cssScanner_1.TokenType.AtKeyword)) {
                return this._parseKeyframe() // nested @keyframe
                    || this._parseImport() // nested @import
                    || this._parseMedia(true) // nested @media
                    || this._parseFontFace() // nested @font-face
                    || this._parseWarnAndDebug() // @warn, @debug and @error statements
                    || this._parseControlStatement() // @if, @while, @for, @each
                    || this._parseFunctionDeclaration() // @function
                    || this._parseExtends() // @extends
                    || this._parseMixinReference() // @include
                    || this._parseMixinContent() // @content
                    || this._parseMixinDeclaration() // nested @mixin
                    || this._parseRuleset(true) // @at-rule
                    || this._parseSupports(true) // @supports
                    || this._parseLayer() // @layer
                    || this._parsePropertyAtRule() // @property
                    || super._parseRuleSetDeclarationAtStatement();
            }
            return this._parseVariableDeclaration() // variable declaration
                || this._tryParseRuleset(true) // nested ruleset
                || super._parseRuleSetDeclaration(); // try css ruleset declaration as last so in the error case, the ast will contain a declaration
        }
        _parseDeclaration(stopTokens) {
            const custonProperty = this._tryParseCustomPropertyDeclaration(stopTokens);
            if (custonProperty) {
                return custonProperty;
            }
            const node = this.create(nodes.Declaration);
            if (!node.setProperty(this._parseProperty())) {
                return null;
            }
            if (!this.accept(cssScanner_1.TokenType.Colon)) {
                return this.finish(node, cssErrors_1.ParseError.ColonExpected, [cssScanner_1.TokenType.Colon], stopTokens || [cssScanner_1.TokenType.SemiColon]);
            }
            if (this.prevToken) {
                node.colonPosition = this.prevToken.offset;
            }
            let hasContent = false;
            if (node.setValue(this._parseExpr())) {
                hasContent = true;
                node.addChild(this._parsePrio());
            }
            if (this.peek(cssScanner_1.TokenType.CurlyL)) {
                node.setNestedProperties(this._parseNestedProperties());
            }
            else {
                if (!hasContent) {
                    return this.finish(node, cssErrors_1.ParseError.PropertyValueExpected);
                }
            }
            if (this.peek(cssScanner_1.TokenType.SemiColon)) {
                node.semicolonPosition = this.token.offset; // not part of the declaration, but useful information for code assist
            }
            return this.finish(node);
        }
        _parseNestedProperties() {
            const node = this.create(nodes.NestedProperties);
            return this._parseBody(node, this._parseDeclaration.bind(this));
        }
        _parseExtends() {
            if (this.peekKeyword('@extend')) {
                const node = this.create(nodes.ExtendsReference);
                this.consumeToken();
                if (!node.getSelectors().addChild(this._parseSimpleSelector())) {
                    return this.finish(node, cssErrors_1.ParseError.SelectorExpected);
                }
                while (this.accept(cssScanner_1.TokenType.Comma)) {
                    node.getSelectors().addChild(this._parseSimpleSelector());
                }
                if (this.accept(cssScanner_1.TokenType.Exclamation)) {
                    if (!this.acceptIdent('optional')) {
                        return this.finish(node, cssErrors_1.ParseError.UnknownKeyword);
                    }
                }
                return this.finish(node);
            }
            return null;
        }
        _parseSimpleSelectorBody() {
            return this._parseSelectorCombinator() || this._parseSelectorPlaceholder() || super._parseSimpleSelectorBody();
        }
        _parseSelectorCombinator() {
            if (this.peekDelim('&')) {
                const node = this.createNode(nodes.NodeType.SelectorCombinator);
                this.consumeToken();
                while (!this.hasWhitespace() && (this.acceptDelim('-') || this.accept(cssScanner_1.TokenType.Num) || this.accept(cssScanner_1.TokenType.Dimension) || node.addChild(this._parseIdent()) || this.acceptDelim('&'))) {
                    //  support &-foo-1
                }
                return this.finish(node);
            }
            return null;
        }
        _parseSelectorPlaceholder() {
            if (this.peekDelim('%')) {
                const node = this.createNode(nodes.NodeType.SelectorPlaceholder);
                this.consumeToken();
                this._parseIdent();
                return this.finish(node);
            }
            else if (this.peekKeyword('@at-root')) {
                const node = this.createNode(nodes.NodeType.SelectorPlaceholder);
                this.consumeToken();
                if (this.accept(cssScanner_1.TokenType.ParenthesisL)) {
                    if (!this.acceptIdent('with') && !this.acceptIdent('without')) {
                        return this.finish(node, cssErrors_1.ParseError.IdentifierExpected);
                    }
                    if (!this.accept(cssScanner_1.TokenType.Colon)) {
                        return this.finish(node, cssErrors_1.ParseError.ColonExpected);
                    }
                    if (!node.addChild(this._parseIdent())) {
                        return this.finish(node, cssErrors_1.ParseError.IdentifierExpected);
                    }
                    if (!this.accept(cssScanner_1.TokenType.ParenthesisR)) {
                        return this.finish(node, cssErrors_1.ParseError.RightParenthesisExpected, [cssScanner_1.TokenType.CurlyR]);
                    }
                }
                return this.finish(node);
            }
            return null;
        }
        _parseElementName() {
            const pos = this.mark();
            const node = super._parseElementName();
            if (node && !this.hasWhitespace() && this.peek(cssScanner_1.TokenType.ParenthesisL)) { // for #49589
                this.restoreAtMark(pos);
                return null;
            }
            return node;
        }
        _tryParsePseudoIdentifier() {
            return this._parseInterpolation() || super._tryParsePseudoIdentifier(); // for #49589
        }
        _parseWarnAndDebug() {
            if (!this.peekKeyword('@debug')
                && !this.peekKeyword('@warn')
                && !this.peekKeyword('@error')) {
                return null;
            }
            const node = this.createNode(nodes.NodeType.Debug);
            this.consumeToken(); // @debug, @warn or @error
            node.addChild(this._parseExpr()); // optional
            return this.finish(node);
        }
        _parseControlStatement(parseStatement = this._parseRuleSetDeclaration.bind(this)) {
            if (!this.peek(cssScanner_1.TokenType.AtKeyword)) {
                return null;
            }
            return this._parseIfStatement(parseStatement) || this._parseForStatement(parseStatement)
                || this._parseEachStatement(parseStatement) || this._parseWhileStatement(parseStatement);
        }
        _parseIfStatement(parseStatement) {
            if (!this.peekKeyword('@if')) {
                return null;
            }
            return this._internalParseIfStatement(parseStatement);
        }
        _internalParseIfStatement(parseStatement) {
            const node = this.create(nodes.IfStatement);
            this.consumeToken(); // @if or if
            if (!node.setExpression(this._parseExpr(true))) {
                return this.finish(node, cssErrors_1.ParseError.ExpressionExpected);
            }
            this._parseBody(node, parseStatement);
            if (this.acceptKeyword('@else')) {
                if (this.peekIdent('if')) {
                    node.setElseClause(this._internalParseIfStatement(parseStatement));
                }
                else if (this.peek(cssScanner_1.TokenType.CurlyL)) {
                    const elseNode = this.create(nodes.ElseStatement);
                    this._parseBody(elseNode, parseStatement);
                    node.setElseClause(elseNode);
                }
            }
            return this.finish(node);
        }
        _parseForStatement(parseStatement) {
            if (!this.peekKeyword('@for')) {
                return null;
            }
            const node = this.create(nodes.ForStatement);
            this.consumeToken(); // @for
            if (!node.setVariable(this._parseVariable())) {
                return this.finish(node, cssErrors_1.ParseError.VariableNameExpected, [cssScanner_1.TokenType.CurlyR]);
            }
            if (!this.acceptIdent('from')) {
                return this.finish(node, scssErrors_1.SCSSParseError.FromExpected, [cssScanner_1.TokenType.CurlyR]);
            }
            if (!node.addChild(this._parseBinaryExpr())) {
                return this.finish(node, cssErrors_1.ParseError.ExpressionExpected, [cssScanner_1.TokenType.CurlyR]);
            }
            if (!this.acceptIdent('to') && !this.acceptIdent('through')) {
                return this.finish(node, scssErrors_1.SCSSParseError.ThroughOrToExpected, [cssScanner_1.TokenType.CurlyR]);
            }
            if (!node.addChild(this._parseBinaryExpr())) {
                return this.finish(node, cssErrors_1.ParseError.ExpressionExpected, [cssScanner_1.TokenType.CurlyR]);
            }
            return this._parseBody(node, parseStatement);
        }
        _parseEachStatement(parseStatement) {
            if (!this.peekKeyword('@each')) {
                return null;
            }
            const node = this.create(nodes.EachStatement);
            this.consumeToken(); // @each
            const variables = node.getVariables();
            if (!variables.addChild(this._parseVariable())) {
                return this.finish(node, cssErrors_1.ParseError.VariableNameExpected, [cssScanner_1.TokenType.CurlyR]);
            }
            while (this.accept(cssScanner_1.TokenType.Comma)) {
                if (!variables.addChild(this._parseVariable())) {
                    return this.finish(node, cssErrors_1.ParseError.VariableNameExpected, [cssScanner_1.TokenType.CurlyR]);
                }
            }
            this.finish(variables);
            if (!this.acceptIdent('in')) {
                return this.finish(node, scssErrors_1.SCSSParseError.InExpected, [cssScanner_1.TokenType.CurlyR]);
            }
            if (!node.addChild(this._parseExpr())) {
                return this.finish(node, cssErrors_1.ParseError.ExpressionExpected, [cssScanner_1.TokenType.CurlyR]);
            }
            return this._parseBody(node, parseStatement);
        }
        _parseWhileStatement(parseStatement) {
            if (!this.peekKeyword('@while')) {
                return null;
            }
            const node = this.create(nodes.WhileStatement);
            this.consumeToken(); // @while
            if (!node.addChild(this._parseBinaryExpr())) {
                return this.finish(node, cssErrors_1.ParseError.ExpressionExpected, [cssScanner_1.TokenType.CurlyR]);
            }
            return this._parseBody(node, parseStatement);
        }
        _parseFunctionBodyDeclaration() {
            return this._parseVariableDeclaration() || this._parseReturnStatement() || this._parseWarnAndDebug()
                || this._parseControlStatement(this._parseFunctionBodyDeclaration.bind(this));
        }
        _parseFunctionDeclaration() {
            if (!this.peekKeyword('@function')) {
                return null;
            }
            const node = this.create(nodes.FunctionDeclaration);
            this.consumeToken(); // @function
            if (!node.setIdentifier(this._parseIdent([nodes.ReferenceType.Function]))) {
                return this.finish(node, cssErrors_1.ParseError.IdentifierExpected, [cssScanner_1.TokenType.CurlyR]);
            }
            if (!this.accept(cssScanner_1.TokenType.ParenthesisL)) {
                return this.finish(node, cssErrors_1.ParseError.LeftParenthesisExpected, [cssScanner_1.TokenType.CurlyR]);
            }
            if (node.getParameters().addChild(this._parseParameterDeclaration())) {
                while (this.accept(cssScanner_1.TokenType.Comma)) {
                    if (this.peek(cssScanner_1.TokenType.ParenthesisR)) {
                        break;
                    }
                    if (!node.getParameters().addChild(this._parseParameterDeclaration())) {
                        return this.finish(node, cssErrors_1.ParseError.VariableNameExpected);
                    }
                }
            }
            if (!this.accept(cssScanner_1.TokenType.ParenthesisR)) {
                return this.finish(node, cssErrors_1.ParseError.RightParenthesisExpected, [cssScanner_1.TokenType.CurlyR]);
            }
            return this._parseBody(node, this._parseFunctionBodyDeclaration.bind(this));
        }
        _parseReturnStatement() {
            if (!this.peekKeyword('@return')) {
                return null;
            }
            const node = this.createNode(nodes.NodeType.ReturnStatement);
            this.consumeToken(); // @function
            if (!node.addChild(this._parseExpr())) {
                return this.finish(node, cssErrors_1.ParseError.ExpressionExpected);
            }
            return this.finish(node);
        }
        _parseMixinDeclaration() {
            if (!this.peekKeyword('@mixin')) {
                return null;
            }
            const node = this.create(nodes.MixinDeclaration);
            this.consumeToken();
            if (!node.setIdentifier(this._parseIdent([nodes.ReferenceType.Mixin]))) {
                return this.finish(node, cssErrors_1.ParseError.IdentifierExpected, [cssScanner_1.TokenType.CurlyR]);
            }
            if (this.accept(cssScanner_1.TokenType.ParenthesisL)) {
                if (node.getParameters().addChild(this._parseParameterDeclaration())) {
                    while (this.accept(cssScanner_1.TokenType.Comma)) {
                        if (this.peek(cssScanner_1.TokenType.ParenthesisR)) {
                            break;
                        }
                        if (!node.getParameters().addChild(this._parseParameterDeclaration())) {
                            return this.finish(node, cssErrors_1.ParseError.VariableNameExpected);
                        }
                    }
                }
                if (!this.accept(cssScanner_1.TokenType.ParenthesisR)) {
                    return this.finish(node, cssErrors_1.ParseError.RightParenthesisExpected, [cssScanner_1.TokenType.CurlyR]);
                }
            }
            return this._parseBody(node, this._parseRuleSetDeclaration.bind(this));
        }
        _parseParameterDeclaration() {
            const node = this.create(nodes.FunctionParameter);
            if (!node.setIdentifier(this._parseVariable())) {
                return null;
            }
            if (this.accept(scssScanner.Ellipsis)) {
                // ok
            }
            if (this.accept(cssScanner_1.TokenType.Colon)) {
                if (!node.setDefaultValue(this._parseExpr(true))) {
                    return this.finish(node, cssErrors_1.ParseError.VariableValueExpected, [], [cssScanner_1.TokenType.Comma, cssScanner_1.TokenType.ParenthesisR]);
                }
            }
            return this.finish(node);
        }
        _parseMixinContent() {
            if (!this.peekKeyword('@content')) {
                return null;
            }
            const node = this.create(nodes.MixinContentReference);
            this.consumeToken();
            if (this.accept(cssScanner_1.TokenType.ParenthesisL)) {
                if (node.getArguments().addChild(this._parseFunctionArgument())) {
                    while (this.accept(cssScanner_1.TokenType.Comma)) {
                        if (this.peek(cssScanner_1.TokenType.ParenthesisR)) {
                            break;
                        }
                        if (!node.getArguments().addChild(this._parseFunctionArgument())) {
                            return this.finish(node, cssErrors_1.ParseError.ExpressionExpected);
                        }
                    }
                }
                if (!this.accept(cssScanner_1.TokenType.ParenthesisR)) {
                    return this.finish(node, cssErrors_1.ParseError.RightParenthesisExpected);
                }
            }
            return this.finish(node);
        }
        _parseMixinReference() {
            if (!this.peekKeyword('@include')) {
                return null;
            }
            const node = this.create(nodes.MixinReference);
            this.consumeToken();
            // Could be module or mixin identifier, set as mixin as default.
            const firstIdent = this._parseIdent([nodes.ReferenceType.Mixin]);
            if (!node.setIdentifier(firstIdent)) {
                return this.finish(node, cssErrors_1.ParseError.IdentifierExpected, [cssScanner_1.TokenType.CurlyR]);
            }
            // Is a module accessor.
            if (!this.hasWhitespace() && this.acceptDelim('.') && !this.hasWhitespace()) {
                const secondIdent = this._parseIdent([nodes.ReferenceType.Mixin]);
                if (!secondIdent) {
                    return this.finish(node, cssErrors_1.ParseError.IdentifierExpected, [cssScanner_1.TokenType.CurlyR]);
                }
                const moduleToken = this.create(nodes.Module);
                // Re-purpose first matched ident as identifier for module token.
                firstIdent.referenceTypes = [nodes.ReferenceType.Module];
                moduleToken.setIdentifier(firstIdent);
                // Override identifier with second ident.
                node.setIdentifier(secondIdent);
                node.addChild(moduleToken);
            }
            if (this.accept(cssScanner_1.TokenType.ParenthesisL)) {
                if (node.getArguments().addChild(this._parseFunctionArgument())) {
                    while (this.accept(cssScanner_1.TokenType.Comma)) {
                        if (this.peek(cssScanner_1.TokenType.ParenthesisR)) {
                            break;
                        }
                        if (!node.getArguments().addChild(this._parseFunctionArgument())) {
                            return this.finish(node, cssErrors_1.ParseError.ExpressionExpected);
                        }
                    }
                }
                if (!this.accept(cssScanner_1.TokenType.ParenthesisR)) {
                    return this.finish(node, cssErrors_1.ParseError.RightParenthesisExpected);
                }
            }
            if (this.peekIdent('using') || this.peek(cssScanner_1.TokenType.CurlyL)) {
                node.setContent(this._parseMixinContentDeclaration());
            }
            return this.finish(node);
        }
        _parseMixinContentDeclaration() {
            const node = this.create(nodes.MixinContentDeclaration);
            if (this.acceptIdent('using')) {
                if (!this.accept(cssScanner_1.TokenType.ParenthesisL)) {
                    return this.finish(node, cssErrors_1.ParseError.LeftParenthesisExpected, [cssScanner_1.TokenType.CurlyL]);
                }
                if (node.getParameters().addChild(this._parseParameterDeclaration())) {
                    while (this.accept(cssScanner_1.TokenType.Comma)) {
                        if (this.peek(cssScanner_1.TokenType.ParenthesisR)) {
                            break;
                        }
                        if (!node.getParameters().addChild(this._parseParameterDeclaration())) {
                            return this.finish(node, cssErrors_1.ParseError.VariableNameExpected);
                        }
                    }
                }
                if (!this.accept(cssScanner_1.TokenType.ParenthesisR)) {
                    return this.finish(node, cssErrors_1.ParseError.RightParenthesisExpected, [cssScanner_1.TokenType.CurlyL]);
                }
            }
            if (this.peek(cssScanner_1.TokenType.CurlyL)) {
                this._parseBody(node, this._parseMixinReferenceBodyStatement.bind(this));
            }
            return this.finish(node);
        }
        _parseMixinReferenceBodyStatement() {
            return this._tryParseKeyframeSelector() || this._parseRuleSetDeclaration();
        }
        _parseFunctionArgument() {
            // [variableName ':'] expression | variableName '...'
            const node = this.create(nodes.FunctionArgument);
            const pos = this.mark();
            const argument = this._parseVariable();
            if (argument) {
                if (!this.accept(cssScanner_1.TokenType.Colon)) {
                    if (this.accept(scssScanner.Ellipsis)) { // optional
                        node.setValue(argument);
                        return this.finish(node);
                    }
                    else {
                        this.restoreAtMark(pos);
                    }
                }
                else {
                    node.setIdentifier(argument);
                }
            }
            if (node.setValue(this._parseExpr(true))) {
                this.accept(scssScanner.Ellipsis); // #43746
                node.addChild(this._parsePrio()); // #9859
                return this.finish(node);
            }
            else if (node.setValue(this._tryParsePrio())) {
                return this.finish(node);
            }
            return null;
        }
        _parseURLArgument() {
            const pos = this.mark();
            const node = super._parseURLArgument();
            if (!node || !this.peek(cssScanner_1.TokenType.ParenthesisR)) {
                this.restoreAtMark(pos);
                const node = this.create(nodes.Node);
                node.addChild(this._parseBinaryExpr());
                return this.finish(node);
            }
            return node;
        }
        _parseOperation() {
            if (!this.peek(cssScanner_1.TokenType.ParenthesisL)) {
                return null;
            }
            const node = this.create(nodes.Node);
            this.consumeToken();
            while (node.addChild(this._parseListElement())) {
                this.accept(cssScanner_1.TokenType.Comma); // optional
            }
            if (!this.accept(cssScanner_1.TokenType.ParenthesisR)) {
                return this.finish(node, cssErrors_1.ParseError.RightParenthesisExpected);
            }
            return this.finish(node);
        }
        _parseListElement() {
            const node = this.create(nodes.ListEntry);
            const child = this._parseBinaryExpr();
            if (!child) {
                return null;
            }
            if (this.accept(cssScanner_1.TokenType.Colon)) {
                node.setKey(child);
                if (!node.setValue(this._parseBinaryExpr())) {
                    return this.finish(node, cssErrors_1.ParseError.ExpressionExpected);
                }
            }
            else {
                node.setValue(child);
            }
            return this.finish(node);
        }
        _parseUse() {
            if (!this.peekKeyword('@use')) {
                return null;
            }
            const node = this.create(nodes.Use);
            this.consumeToken(); // @use
            if (!node.addChild(this._parseStringLiteral())) {
                return this.finish(node, cssErrors_1.ParseError.StringLiteralExpected);
            }
            if (!this.peek(cssScanner_1.TokenType.SemiColon) && !this.peek(cssScanner_1.TokenType.EOF)) {
                if (!this.peekRegExp(cssScanner_1.TokenType.Ident, /as|with/)) {
                    return this.finish(node, cssErrors_1.ParseError.UnknownKeyword);
                }
                if (this.acceptIdent('as') &&
                    (!node.setIdentifier(this._parseIdent([nodes.ReferenceType.Module])) && !this.acceptDelim('*'))) {
                    return this.finish(node, cssErrors_1.ParseError.IdentifierOrWildcardExpected);
                }
                if (this.acceptIdent('with')) {
                    if (!this.accept(cssScanner_1.TokenType.ParenthesisL)) {
                        return this.finish(node, cssErrors_1.ParseError.LeftParenthesisExpected, [cssScanner_1.TokenType.ParenthesisR]);
                    }
                    // First variable statement, no comma.
                    if (!node.getParameters().addChild(this._parseModuleConfigDeclaration())) {
                        return this.finish(node, cssErrors_1.ParseError.VariableNameExpected);
                    }
                    while (this.accept(cssScanner_1.TokenType.Comma)) {
                        if (this.peek(cssScanner_1.TokenType.ParenthesisR)) {
                            break;
                        }
                        if (!node.getParameters().addChild(this._parseModuleConfigDeclaration())) {
                            return this.finish(node, cssErrors_1.ParseError.VariableNameExpected);
                        }
                    }
                    if (!this.accept(cssScanner_1.TokenType.ParenthesisR)) {
                        return this.finish(node, cssErrors_1.ParseError.RightParenthesisExpected);
                    }
                }
            }
            if (!this.accept(cssScanner_1.TokenType.SemiColon) && !this.accept(cssScanner_1.TokenType.EOF)) {
                return this.finish(node, cssErrors_1.ParseError.SemiColonExpected);
            }
            return this.finish(node);
        }
        _parseModuleConfigDeclaration() {
            const node = this.create(nodes.ModuleConfiguration);
            if (!node.setIdentifier(this._parseVariable())) {
                return null;
            }
            if (!this.accept(cssScanner_1.TokenType.Colon) || !node.setValue(this._parseExpr(true))) {
                return this.finish(node, cssErrors_1.ParseError.VariableValueExpected, [], [cssScanner_1.TokenType.Comma, cssScanner_1.TokenType.ParenthesisR]);
            }
            if (this.accept(cssScanner_1.TokenType.Exclamation)) {
                if (this.hasWhitespace() || !this.acceptIdent('default')) {
                    return this.finish(node, cssErrors_1.ParseError.UnknownKeyword);
                }
            }
            return this.finish(node);
        }
        _parseForward() {
            if (!this.peekKeyword('@forward')) {
                return null;
            }
            const node = this.create(nodes.Forward);
            this.consumeToken();
            if (!node.addChild(this._parseStringLiteral())) {
                return this.finish(node, cssErrors_1.ParseError.StringLiteralExpected);
            }
            if (this.acceptIdent('as')) {
                const identifier = this._parseIdent([nodes.ReferenceType.Forward]);
                if (!node.setIdentifier(identifier)) {
                    return this.finish(node, cssErrors_1.ParseError.IdentifierExpected);
                }
                // Wildcard must be the next character after the identifier string.
                if (this.hasWhitespace() || !this.acceptDelim('*')) {
                    return this.finish(node, cssErrors_1.ParseError.WildcardExpected);
                }
            }
            if (this.acceptIdent('with')) {
                if (!this.accept(cssScanner_1.TokenType.ParenthesisL)) {
                    return this.finish(node, cssErrors_1.ParseError.LeftParenthesisExpected, [cssScanner_1.TokenType.ParenthesisR]);
                }
                // First variable statement, no comma.
                if (!node.getParameters().addChild(this._parseModuleConfigDeclaration())) {
                    return this.finish(node, cssErrors_1.ParseError.VariableNameExpected);
                }
                while (this.accept(cssScanner_1.TokenType.Comma)) {
                    if (this.peek(cssScanner_1.TokenType.ParenthesisR)) {
                        break;
                    }
                    if (!node.getParameters().addChild(this._parseModuleConfigDeclaration())) {
                        return this.finish(node, cssErrors_1.ParseError.VariableNameExpected);
                    }
                }
                if (!this.accept(cssScanner_1.TokenType.ParenthesisR)) {
                    return this.finish(node, cssErrors_1.ParseError.RightParenthesisExpected);
                }
            }
            else if (this.peekIdent('hide') || this.peekIdent('show')) {
                if (!node.addChild(this._parseForwardVisibility())) {
                    return this.finish(node, cssErrors_1.ParseError.IdentifierOrVariableExpected);
                }
            }
            if (!this.accept(cssScanner_1.TokenType.SemiColon) && !this.accept(cssScanner_1.TokenType.EOF)) {
                return this.finish(node, cssErrors_1.ParseError.SemiColonExpected);
            }
            return this.finish(node);
        }
        _parseForwardVisibility() {
            const node = this.create(nodes.ForwardVisibility);
            // Assume to be "hide" or "show".
            node.setIdentifier(this._parseIdent());
            while (node.addChild(this._parseVariable() || this._parseIdent())) {
                // Consume all variables and idents ahead.
                this.accept(cssScanner_1.TokenType.Comma);
            }
            // More than just identifier 
            return node.getChildren().length > 1 ? node : null;
        }
        _parseSupportsCondition() {
            return this._parseInterpolation() || super._parseSupportsCondition();
        }
    }
    exports.SCSSParser = SCSSParser;
});
