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✏️ Editing: scheme.js

// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

/**
 * Author: Koh Zi Han, based on implementation by Koh Zi Chun
 * Improved by: Jakub T. Jankiewicz
 */

(function(mod) {
  if (typeof exports == "object" && typeof module == "object") // CommonJS
    mod(require("../../lib/codemirror"));
  else if (typeof define == "function" && define.amd) // AMD
    define(["../../lib/codemirror"], mod);
  else // Plain browser env
    mod(CodeMirror);
})(function(CodeMirror) {
"use strict";

CodeMirror.defineMode("scheme", function () {
    var BUILTIN = "builtin", COMMENT = "comment", STRING = "string",
        SYMBOL = "symbol", ATOM = "atom", NUMBER = "number", BRACKET = "bracket";
    var INDENT_WORD_SKIP = 2;

function makeKeywords(str) {
        var obj = {}, words = str.split(" ");
        for (var i = 0; i < words.length; ++i) obj[words[i]] = true;
        return obj;
    }

var keywords = makeKeywords("λ case-lambda call/cc class cond-expand define-class define-values exit-handler field import inherit init-field interface let*-values let-values let/ec mixin opt-lambda override protect provide public rename require require-for-syntax syntax syntax-case syntax-error unit/sig unless when with-syntax and begin call-with-current-continuation call-with-input-file call-with-output-file case cond define define-syntax define-macro defmacro delay do dynamic-wind else for-each if lambda let let* let-syntax letrec letrec-syntax map or syntax-rules abs acos angle append apply asin assoc assq assv atan boolean? caar cadr call-with-input-file call-with-output-file call-with-values car cdddar cddddr cdr ceiling char->integer char-alphabetic? char-ci<=? char-ci<? char-ci=? char-ci>=? char-ci>? char-downcase char-lower-case? char-numeric? char-ready? char-upcase char-upper-case? char-whitespace? char<=? char<? char=? char>=? char>? char? close-input-port close-output-port complex? cons cos current-input-port current-output-port denominator display eof-object? eq? equal? eqv? eval even? exact->inexact exact? exp expt #f floor force gcd imag-part inexact->exact inexact? input-port? integer->char integer? interaction-environment lcm length list list->string list->vector list-ref list-tail list? load log magnitude make-polar make-rectangular make-string make-vector max member memq memv min modulo negative? newline not null-environment null? number->string number? numerator odd? open-input-file open-output-file output-port? pair? peek-char port? positive? procedure? quasiquote quote quotient rational? rationalize read read-char real-part real? remainder reverse round scheme-report-environment set! set-car! set-cdr! sin sqrt string string->list string->number string->symbol string-append string-ci<=? string-ci<? string-ci=? string-ci>=? string-ci>? string-copy string-fill! string-length string-ref string-set! string<=? string<? string=? string>=? string>? string? substring symbol->string symbol? #t tan transcript-off transcript-on truncate values vector vector->list vector-fill! vector-length vector-ref vector-set! with-input-from-file with-output-to-file write write-char zero?");
    var indentKeys = makeKeywords("define let letrec let* lambda define-macro defmacro let-syntax letrec-syntax let-values let*-values define-syntax syntax-rules define-values when unless");

function stateStack(indent, type, prev) { // represents a state stack object
        this.indent = indent;
        this.type = type;
        this.prev = prev;
    }

function pushStack(state, indent, type) {
        state.indentStack = new stateStack(indent, type, state.indentStack);
    }

function popStack(state) {
        state.indentStack = state.indentStack.prev;
    }

var binaryMatcher = new RegExp(/^(?:[-+]i|[-+][01]+#*(?:\/[01]+#*)?i|[-+]?[01]+#*(?:\/[01]+#*)?@[-+]?[01]+#*(?:\/[01]+#*)?|[-+]?[01]+#*(?:\/[01]+#*)?[-+](?:[01]+#*(?:\/[01]+#*)?)?i|[-+]?[01]+#*(?:\/[01]+#*)?)(?=[()\s;"]|$)/i);
    var octalMatcher = new RegExp(/^(?:[-+]i|[-+][0-7]+#*(?:\/[0-7]+#*)?i|[-+]?[0-7]+#*(?:\/[0-7]+#*)?@[-+]?[0-7]+#*(?:\/[0-7]+#*)?|[-+]?[0-7]+#*(?:\/[0-7]+#*)?[-+](?:[0-7]+#*(?:\/[0-7]+#*)?)?i|[-+]?[0-7]+#*(?:\/[0-7]+#*)?)(?=[()\s;"]|$)/i);
    var hexMatcher = new RegExp(/^(?:[-+]i|[-+][\da-f]+#*(?:\/[\da-f]+#*)?i|[-+]?[\da-f]+#*(?:\/[\da-f]+#*)?@[-+]?[\da-f]+#*(?:\/[\da-f]+#*)?|[-+]?[\da-f]+#*(?:\/[\da-f]+#*)?[-+](?:[\da-f]+#*(?:\/[\da-f]+#*)?)?i|[-+]?[\da-f]+#*(?:\/[\da-f]+#*)?)(?=[()\s;"]|$)/i);
    var decimalMatcher = new RegExp(/^(?:[-+]i|[-+](?:(?:(?:\d+#+\.?#*|\d+\.\d*#*|\.\d+#*|\d+)(?:[esfdl][-+]?\d+)?)|\d+#*\/\d+#*)i|[-+]?(?:(?:(?:\d+#+\.?#*|\d+\.\d*#*|\.\d+#*|\d+)(?:[esfdl][-+]?\d+)?)|\d+#*\/\d+#*)@[-+]?(?:(?:(?:\d+#+\.?#*|\d+\.\d*#*|\.\d+#*|\d+)(?:[esfdl][-+]?\d+)?)|\d+#*\/\d+#*)|[-+]?(?:(?:(?:\d+#+\.?#*|\d+\.\d*#*|\.\d+#*|\d+)(?:[esfdl][-+]?\d+)?)|\d+#*\/\d+#*)[-+](?:(?:(?:\d+#+\.?#*|\d+\.\d*#*|\.\d+#*|\d+)(?:[esfdl][-+]?\d+)?)|\d+#*\/\d+#*)?i|(?:(?:(?:\d+#+\.?#*|\d+\.\d*#*|\.\d+#*|\d+)(?:[esfdl][-+]?\d+)?)|\d+#*\/\d+#*))(?=[()\s;"]|$)/i);

function isBinaryNumber (stream) {
        return stream.match(binaryMatcher);
    }

function isOctalNumber (stream) {
        return stream.match(octalMatcher);
    }

function isDecimalNumber (stream, backup) {
        if (backup === true) {
            stream.backUp(1);
        }
        return stream.match(decimalMatcher);
    }

function isHexNumber (stream) {
        return stream.match(hexMatcher);
    }

function processEscapedSequence(stream, options) {
        var next, escaped = false;
        while ((next = stream.next()) != null) {
            if (next == options.token && !escaped) {

options.state.mode = false;
                break;
            }
            escaped = !escaped && next == "\\";
        }
    }

return {
        startState: function () {
            return {
                indentStack: null,
                indentation: 0,
                mode: false,
                sExprComment: false,
                sExprQuote: false
            };
        },

token: function (stream, state) {
            if (state.indentStack == null && stream.sol()) {
                // update indentation, but only if indentStack is empty
                state.indentation = stream.indentation();
            }

// skip spaces
            if (stream.eatSpace()) {
                return null;
            }
            var returnType = null;

switch(state.mode){
                case "string": // multi-line string parsing mode
                    processEscapedSequence(stream, {
                        token: "\"",
                        state: state
                    });
                    returnType = STRING; // continue on in scheme-string mode
                    break;
                case "symbol": // escape symbol
                    processEscapedSequence(stream, {
                        token: "|",
                        state: state
                    });
                    returnType = SYMBOL; // continue on in scheme-symbol mode
                    break;
                case "comment": // comment parsing mode
                    var next, maybeEnd = false;
                    while ((next = stream.next()) != null) {
                        if (next == "#" && maybeEnd) {

state.mode = false;
                            break;
                        }
                        maybeEnd = (next == "|");
                    }
                    returnType = COMMENT;
                    break;
                case "s-expr-comment": // s-expr commenting mode
                    state.mode = false;
                    if(stream.peek() == "(" || stream.peek() == "["){
                        // actually start scheme s-expr commenting mode
                        state.sExprComment = 0;
                    }else{
                        // if not we just comment the entire of the next token
                        stream.eatWhile(/[^\s\[\]]/); // eat symbol atom
                        returnType = COMMENT;
                        break;
                    }
                default: // default parsing mode
                    var ch = stream.next();

if (ch == "\"") {
                        state.mode = "string";
                        returnType = STRING;

} else if (ch == "'") {
                        if (stream.peek() == "(" || stream.peek() == "["){
                            if (typeof state.sExprQuote != "number") {
                                state.sExprQuote = 0;
                            } // else already in a quoted expression
                            returnType = ATOM;
                        } else {
                            stream.eatWhile(/[\w_\-!$%&*+\.\/:<=>?@\^~]/);
                            returnType = ATOM;
                        }
                    } else if (ch == '|') {
                        state.mode = "symbol";
                        returnType = SYMBOL;
                    } else if (ch == '#') {
                        if (stream.eat("|")) {                    // Multi-line comment
                            state.mode = "comment"; // toggle to comment mode
                            returnType = COMMENT;
                        } else if (stream.eat(/[tf]/i)) {            // #t/#f (atom)
                            returnType = ATOM;
                        } else if (stream.eat(';')) {                // S-Expr comment
                            state.mode = "s-expr-comment";
                            returnType = COMMENT;
                        } else {
                            var numTest = null, hasExactness = false, hasRadix = true;
                            if (stream.eat(/[ei]/i)) {
                                hasExactness = true;
                            } else {
                                stream.backUp(1);       // must be radix specifier
                            }
                            if (stream.match(/^#b/i)) {
                                numTest = isBinaryNumber;
                            } else if (stream.match(/^#o/i)) {
                                numTest = isOctalNumber;
                            } else if (stream.match(/^#x/i)) {
                                numTest = isHexNumber;
                            } else if (stream.match(/^#d/i)) {
                                numTest = isDecimalNumber;
                            } else if (stream.match(/^[-+0-9.]/, false)) {
                                hasRadix = false;
                                numTest = isDecimalNumber;
                            // re-consume the initial # if all matches failed
                            } else if (!hasExactness) {
                                stream.eat('#');
                            }
                            if (numTest != null) {
                                if (hasRadix && !hasExactness) {
                                    // consume optional exactness after radix
                                    stream.match(/^#[ei]/i);
                                }
                                if (numTest(stream))
                                    returnType = NUMBER;
                            }
                        }
                    } else if (/^[-+0-9.]/.test(ch) && isDecimalNumber(stream, true)) { // match non-prefixed number, must be decimal
                        returnType = NUMBER;
                    } else if (ch == ";") { // comment
                        stream.skipToEnd(); // rest of the line is a comment
                        returnType = COMMENT;
                    } else if (ch == "(" || ch == "[") {
                      var keyWord = ''; var indentTemp = stream.column(), letter;
                        /**
                        Either
                        (indent-word ..
                        (non-indent-word ..
                        (;something else, bracket, etc.
                        */

while ((letter = stream.eat(/[^\s$\[\;$\]]/)) != null) {
                            keyWord += letter;
                        }

if (keyWord.length > 0 && indentKeys.propertyIsEnumerable(keyWord)) { // indent-word

pushStack(state, indentTemp + INDENT_WORD_SKIP, ch);
                        } else { // non-indent word
                            // we continue eating the spaces
                            stream.eatSpace();
                            if (stream.eol() || stream.peek() == ";") {
                                // nothing significant after
                                // we restart indentation 1 space after
                                pushStack(state, indentTemp + 1, ch);
                            } else {
                                pushStack(state, indentTemp + stream.current().length, ch); // else we match
                            }
                        }
                        stream.backUp(stream.current().length - 1); // undo all the eating

if(typeof state.sExprComment == "number") state.sExprComment++;
                        if(typeof state.sExprQuote == "number") state.sExprQuote++;

returnType = BRACKET;
                    } else if (ch == ")" || ch == "]") {
                        returnType = BRACKET;
                        if (state.indentStack != null && state.indentStack.type == (ch == ")" ? "(" : "[")) {
                            popStack(state);

if(typeof state.sExprComment == "number"){
                                if(--state.sExprComment == 0){
                                    returnType = COMMENT; // final closing bracket
                                    state.sExprComment = false; // turn off s-expr commenting mode
                                }
                            }
                            if(typeof state.sExprQuote == "number"){
                                if(--state.sExprQuote == 0){
                                    returnType = ATOM; // final closing bracket
                                    state.sExprQuote = false; // turn off s-expr quote mode
                                }
                            }
                        }
                    } else {
                        stream.eatWhile(/[\w_\-!$%&*+\.\/:<=>?@\^~]/);

if (keywords && keywords.propertyIsEnumerable(stream.current())) {
                            returnType = BUILTIN;
                        } else returnType = "variable";
                    }
            }
            return (typeof state.sExprComment == "number") ? COMMENT : ((typeof state.sExprQuote == "number") ? ATOM : returnType);
        },

indent: function (state) {
            if (state.indentStack == null) return state.indentation;
            return state.indentStack.indent;
        },

fold: "brace-paren",
        closeBrackets: {pairs: "()[]{}\"\""},
        lineComment: ";;"
    };
});

CodeMirror.defineMIME("text/x-scheme", "scheme");

});

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