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}\n\n    for (let i = 0; i < propertiesToCopy.length; i++) {\n        if (original.hasOwnProperty(propertiesToCopy[i])) {\n            destination[propertiesToCopy[i]] = original[propertiesToCopy[i]];\n        }\n    }\n};\n\n/*\n parse is used whilst parsing\n */\nconst parseCopyProperties = [\n    // options\n    'paths',            // option - unmodified - paths to search for imports on\n    'rewriteUrls',      // option - whether to adjust URL's to be relative\n    'rootpath',         // option - rootpath to append to URL's\n    'strictImports',    // option -\n    'insecure',         // option - whether to allow imports from insecure ssl hosts\n    'dumpLineNumbers',  // option - whether to dump line numbers\n    'compress',         // option - whether to compress\n    'syncImport',       // option - whether to import synchronously\n    'chunkInput',       // option - whether to chunk input. more performant but causes parse issues.\n    'mime',             // browser only - mime type for sheet import\n    'useFileCache',     // browser only - whether to use the per file session cache\n    // context\n    'processImports',   // option & context - whether to process imports. if false then imports will not be imported.\n    // Used by the import manager to stop multiple import visitors being created.\n    'pluginManager'     // Used as the plugin manager for the session\n];\n\ncontexts.Parse = function(options) {\n    copyFromOriginal(options, this, parseCopyProperties);\n\n    if (typeof this.paths === 'string') { this.paths = [this.paths]; }\n};\n\nconst evalCopyProperties = [\n    'paths',             // additional include paths\n    'compress',          // whether to compress\n    'math',              // whether math has to be within parenthesis\n    'strictUnits',       // whether units need to evaluate correctly\n    'sourceMap',         // whether to output a source map\n    'importMultiple',    // whether we are currently importing multiple copies\n    'urlArgs',           // whether to add args into url tokens\n    'javascriptEnabled', // option - whether Inline JavaScript is enabled. if undefined, defaults to false\n    'pluginManager',     // Used as the plugin manager for the session\n    'importantScope',    // used to bubble up !important statements\n    'rewriteUrls'        // option - whether to adjust URL's to be relative\n];\n\ncontexts.Eval = function(options, frames) {\n    copyFromOriginal(options, this, evalCopyProperties);\n\n    if (typeof this.paths === 'string') { this.paths = [this.paths]; }\n\n    this.frames = frames || [];\n    this.importantScope = this.importantScope || [];\n};\n\ncontexts.Eval.prototype.enterCalc = function () {\n    if (!this.calcStack) {\n        this.calcStack = [];\n    }\n    this.calcStack.push(true);\n    this.inCalc = true;\n};\n\ncontexts.Eval.prototype.exitCalc = function () {\n    this.calcStack.pop();\n    if (!this.calcStack.length) {\n        this.inCalc = false;\n    }\n};\n\ncontexts.Eval.prototype.inParenthesis = function () {\n    if (!this.parensStack) {\n        this.parensStack = [];\n    }\n    this.parensStack.push(true);\n};\n\ncontexts.Eval.prototype.outOfParenthesis = function () {\n    this.parensStack.pop();\n};\n\ncontexts.Eval.prototype.inCalc = false;\ncontexts.Eval.prototype.mathOn = true;\ncontexts.Eval.prototype.isMathOn = function (op) {\n    if (!this.mathOn) {\n        return false;\n    }\n    if (op === '/' && this.math !== Constants.Math.ALWAYS && (!this.parensStack || !this.parensStack.length)) {\n        return false;\n    }\n    if (this.math > Constants.Math.PARENS_DIVISION) {\n        return this.parensStack && this.parensStack.length;\n    }\n    return true;\n};\n\ncontexts.Eval.prototype.pathRequiresRewrite = function (path) {\n    const isRelative = this.rewriteUrls === Constants.RewriteUrls.LOCAL ? isPathLocalRelative : isPathRelative;\n\n    return isRelative(path);\n};\n\ncontexts.Eval.prototype.rewritePath = function (path, rootpath) {\n    let newPath;\n\n    rootpath = rootpath || '';\n    newPath = this.normalizePath(rootpath + path);\n\n    // If a path was explicit relative and the rootpath was not an absolute path\n    // we must ensure that the new path is also explicit relative.\n    if (isPathLocalRelative(path) &&\n        isPathRelative(rootpath) &&\n        isPathLocalRelative(newPath) === false) {\n        newPath = `./${newPath}`;\n    }\n\n    return newPath;\n};\n\ncontexts.Eval.prototype.normalizePath = function (path) {\n    const segments = path.split('/').reverse();\n    let segment;\n\n    path = [];\n    while (segments.length !== 0) {\n        segment = segments.pop();\n        switch ( segment ) {\n            case '.':\n                break;\n            case '..':\n                if ((path.length === 0) || (path[path.length - 1] === '..')) {\n                    path.push( segment );\n                } else {\n                    path.pop();\n                }\n                break;\n            default:\n                path.push(segment);\n                break;\n        }\n    }\n\n    return path.join('/');\n};\n\nfunction isPathRelative(path) {\n    return !/^(?:[a-z-]+:|\\/|#)/i.test(path);\n}\n\nfunction isPathLocalRelative(path) {\n    return path.charAt(0) === '.';\n}\n\n// todo - do the same for the toCSS ?\n"]}