source: node_modules/prismjs/components/prism-stan.js

(function (Prism) {

        // https://mc-stan.org/docs/2_28/reference-manual/bnf-grammars.html

        var higherOrderFunctions = /\b(?:algebra_solver|algebra_solver_newton|integrate_1d|integrate_ode|integrate_ode_bdf|integrate_ode_rk45|map_rect|ode_(?:adams|bdf|ckrk|rk45)(?:_tol)?|ode_adjoint_tol_ctl|reduce_sum|reduce_sum_static)\b/;

        Prism.languages.stan = {
                'comment': /\/\/.*|\/\*[\s\S]*?\*\/|#(?!include).*/,
                'string': {
                        // String literals can contain spaces and any printable ASCII characters except for " and \
                        // https://mc-stan.org/docs/2_24/reference-manual/print-statements-section.html#string-literals
                        pattern: /"[\x20\x21\x23-\x5B\x5D-\x7E]*"/,
                        greedy: true
                },
                'directive': {
                        pattern: /^([ \t]*)#include\b.*/m,
                        lookbehind: true,
                        alias: 'property'
                },

                'function-arg': {
                        pattern: RegExp(
                                '(' +
                                higherOrderFunctions.source +
                                /\s*\(\s*/.source +
                                ')' +
                                /[a-zA-Z]\w*/.source
                        ),
                        lookbehind: true,
                        alias: 'function'
                },
                'constraint': {
                        pattern: /(\b(?:int|matrix|real|row_vector|vector)\s*)<[^<>]*>/,
                        lookbehind: true,
                        inside: {
                                'expression': {
                                        pattern: /(=\s*)\S(?:\S|\s+(?!\s))*?(?=\s*(?:>$|,\s*\w+\s*=))/,
                                        lookbehind: true,
                                        inside: null // see below
                                },
                                'property': /\b[a-z]\w*(?=\s*=)/i,
                                'operator': /=/,
                                'punctuation': /^<|>$|,/
                        }
                },
                'keyword': [
                        {
                                pattern: /\bdata(?=\s*\{)|\b(?:functions|generated|model|parameters|quantities|transformed)\b/,
                                alias: 'program-block'
                        },
                        /\b(?:array|break|cholesky_factor_corr|cholesky_factor_cov|complex|continue|corr_matrix|cov_matrix|data|else|for|if|in|increment_log_prob|int|matrix|ordered|positive_ordered|print|real|reject|return|row_vector|simplex|target|unit_vector|vector|void|while)\b/,
                        // these are functions that are known to take another function as their first argument.
                        higherOrderFunctions
                ],
                'function': /\b[a-z]\w*(?=\s*\()/i,
                'number': /(?:\b\d+(?:_\d+)*(?:\.(?:\d+(?:_\d+)*)?)?|\B\.\d+(?:_\d+)*)(?:E[+-]?\d+(?:_\d+)*)?i?(?!\w)/i,
                'boolean': /\b(?:false|true)\b/,

                'operator': /<-|\.[*/]=?|\|\|?|&&|[!=<>+\-*/]=?|['^%~?:]/,
                'punctuation': /[()\[\]{},;]/
        };

        Prism.languages.stan.constraint.inside.expression.inside = Prism.languages.stan;

}(Prism));