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// CodeMirror, copyright (c) by Marijn Haverbeke and others
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// Distributed under an MIT license: https://codemirror.net/LICENSE
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(function(mod) {
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  if (typeof exports == "object" && typeof module == "object") // CommonJS
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    mod(require("../../lib/codemirror"));
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  else if (typeof define == "function" && define.amd) // AMD
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    define(["../../lib/codemirror"], mod);
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  else // Plain browser env
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    mod(CodeMirror);
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})(function(CodeMirror) {
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  "use strict";
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  CodeMirror.defineMode("crystal", function(config) {
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    function wordRegExp(words, end) {
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      return new RegExp((end ? "" : "^") + "(?:" + words.join("|") + ")" + (end ? "$" : "\\b"));
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    }
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    function chain(tokenize, stream, state) {
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      state.tokenize.push(tokenize);
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      return tokenize(stream, state);
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    }
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    var operators = /^(?:[-+/%|&^]|\*\*?|[<>]{2})/;
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    var conditionalOperators = /^(?:[=!]~|===|<=>|[<>=!]=?|[|&]{2}|~)/;
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    var indexingOperators = /^(?:\[\][?=]?)/;
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    var anotherOperators = /^(?:\.(?:\.{2})?|->|[?:])/;
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    var idents = /^[a-z_\u009F-\uFFFF][a-zA-Z0-9_\u009F-\uFFFF]*/;
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    var types = /^[A-Z_\u009F-\uFFFF][a-zA-Z0-9_\u009F-\uFFFF]*/;
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    var keywords = wordRegExp([
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      "abstract", "alias", "as", "asm", "begin", "break", "case", "class", "def", "do",
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      "else", "elsif", "end", "ensure", "enum", "extend", "for", "fun", "if",
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      "include", "instance_sizeof", "lib", "macro", "module", "next", "of", "out", "pointerof",
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      "private", "protected", "rescue", "return", "require", "select", "sizeof", "struct",
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      "super", "then", "type", "typeof", "uninitialized", "union", "unless", "until", "when", "while", "with",
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      "yield", "__DIR__", "__END_LINE__", "__FILE__", "__LINE__"
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    ]);
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    var atomWords = wordRegExp(["true", "false", "nil", "self"]);
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    var indentKeywordsArray = [
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      "def", "fun", "macro",
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      "class", "module", "struct", "lib", "enum", "union",
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      "do", "for"
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    ];
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    var indentKeywords = wordRegExp(indentKeywordsArray);
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    var indentExpressionKeywordsArray = ["if", "unless", "case", "while", "until", "begin", "then"];
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    var indentExpressionKeywords = wordRegExp(indentExpressionKeywordsArray);
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    var dedentKeywordsArray = ["end", "else", "elsif", "rescue", "ensure"];
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    var dedentKeywords = wordRegExp(dedentKeywordsArray);
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    var dedentPunctualsArray = ["\\)", "\\}", "\\]"];
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    var dedentPunctuals = new RegExp("^(?:" + dedentPunctualsArray.join("|") + ")$");
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    var nextTokenizer = {
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      "def": tokenFollowIdent, "fun": tokenFollowIdent, "macro": tokenMacroDef,
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      "class": tokenFollowType, "module": tokenFollowType, "struct": tokenFollowType,
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      "lib": tokenFollowType, "enum": tokenFollowType, "union": tokenFollowType
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    };
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    var matching = {"[": "]", "{": "}", "(": ")", "<": ">"};
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    function tokenBase(stream, state) {
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      if (stream.eatSpace()) {
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        return null;
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      }
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      // Macros
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      if (state.lastToken != "\\" && stream.match("{%", false)) {
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        return chain(tokenMacro("%", "%"), stream, state);
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      }
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      if (state.lastToken != "\\" && stream.match("{{", false)) {
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        return chain(tokenMacro("{", "}"), stream, state);
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      }
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      // Comments
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      if (stream.peek() == "#") {
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        stream.skipToEnd();
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        return "comment";
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      }
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      // Variables and keywords
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      var matched;
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      if (stream.match(idents)) {
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        stream.eat(/[?!]/);
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        matched = stream.current();
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        if (stream.eat(":")) {
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          return "atom";
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        } else if (state.lastToken == ".") {
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          return "property";
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        } else if (keywords.test(matched)) {
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          if (indentKeywords.test(matched)) {
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            if (!(matched == "fun" && state.blocks.indexOf("lib") >= 0) && !(matched == "def" && state.lastToken == "abstract")) {
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              state.blocks.push(matched);
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              state.currentIndent += 1;
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            }
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          } else if ((state.lastStyle == "operator" || !state.lastStyle) && indentExpressionKeywords.test(matched)) {
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            state.blocks.push(matched);
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            state.currentIndent += 1;
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          } else if (matched == "end") {
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            state.blocks.pop();
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            state.currentIndent -= 1;
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          }
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          if (nextTokenizer.hasOwnProperty(matched)) {
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            state.tokenize.push(nextTokenizer[matched]);
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          }
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          return "keyword";
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        } else if (atomWords.test(matched)) {
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          return "atom";
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        }
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        return "variable";
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      }
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      // Class variables and instance variables
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      // or attributes
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      if (stream.eat("@")) {
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        if (stream.peek() == "[") {
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          return chain(tokenNest("[", "]", "meta"), stream, state);
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        }
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        stream.eat("@");
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        stream.match(idents) || stream.match(types);
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        return "variable-2";
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      }
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      // Constants and types
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      if (stream.match(types)) {
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        return "tag";
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      }
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      // Symbols or ':' operator
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      if (stream.eat(":")) {
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        if (stream.eat("\"")) {
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          return chain(tokenQuote("\"", "atom", false), stream, state);
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        } else if (stream.match(idents) || stream.match(types) ||
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                   stream.match(operators) || stream.match(conditionalOperators) || stream.match(indexingOperators)) {
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          return "atom";
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        }
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        stream.eat(":");
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        return "operator";
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      }
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      // Strings
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      if (stream.eat("\"")) {
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        return chain(tokenQuote("\"", "string", true), stream, state);
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      }
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      // Strings or regexps or macro variables or '%' operator
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      if (stream.peek() == "%") {
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        var style = "string";
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        var embed = true;
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        var delim;
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        if (stream.match("%r")) {
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          // Regexps
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          style = "string-2";
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          delim = stream.next();
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        } else if (stream.match("%w")) {
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          embed = false;
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          delim = stream.next();
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        } else if (stream.match("%q")) {
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          embed = false;
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          delim = stream.next();
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        } else {
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          if(delim = stream.match(/^%([^\w\s=])/)) {
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            delim = delim[1];
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          } else if (stream.match(/^%[a-zA-Z_\u009F-\uFFFF][\w\u009F-\uFFFF]*/)) {
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            // Macro variables
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            return "meta";
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          } else if (stream.eat('%')) {
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            // '%' operator
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            return "operator";
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          }
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        }
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        if (matching.hasOwnProperty(delim)) {
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          delim = matching[delim];
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        }
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        return chain(tokenQuote(delim, style, embed), stream, state);
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      }
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      // Here Docs
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      if (matched = stream.match(/^<<-('?)([A-Z]\w*)\1/)) {
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        return chain(tokenHereDoc(matched[2], !matched[1]), stream, state)
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      }
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      // Characters
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      if (stream.eat("'")) {
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        stream.match(/^(?:[^']|\\(?:[befnrtv0'"]|[0-7]{3}|u(?:[0-9a-fA-F]{4}|\{[0-9a-fA-F]{1,6}\})))/);
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        stream.eat("'");
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        return "atom";
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      }
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      // Numbers
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      if (stream.eat("0")) {
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        if (stream.eat("x")) {
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          stream.match(/^[0-9a-fA-F_]+/);
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        } else if (stream.eat("o")) {
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          stream.match(/^[0-7_]+/);
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        } else if (stream.eat("b")) {
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          stream.match(/^[01_]+/);
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        }
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        return "number";
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      }
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      if (stream.eat(/^\d/)) {
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        stream.match(/^[\d_]*(?:\.[\d_]+)?(?:[eE][+-]?\d+)?/);
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        return "number";
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      }
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      // Operators
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      if (stream.match(operators)) {
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        stream.eat("="); // Operators can follow assign symbol.
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        return "operator";
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      }
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      if (stream.match(conditionalOperators) || stream.match(anotherOperators)) {
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        return "operator";
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      }
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      // Parens and braces
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      if (matched = stream.match(/[({[]/, false)) {
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        matched = matched[0];
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        return chain(tokenNest(matched, matching[matched], null), stream, state);
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      }
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      // Escapes
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      if (stream.eat("\\")) {
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        stream.next();
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        return "meta";
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      }
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      stream.next();
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      return null;
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    }
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    function tokenNest(begin, end, style, started) {
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      return function (stream, state) {
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        if (!started && stream.match(begin)) {
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          state.tokenize[state.tokenize.length - 1] = tokenNest(begin, end, style, true);
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          state.currentIndent += 1;
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          return style;
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        }
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        var nextStyle = tokenBase(stream, state);
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        if (stream.current() === end) {
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          state.tokenize.pop();
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          state.currentIndent -= 1;
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          nextStyle = style;
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        }
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        return nextStyle;
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      };
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    }
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    function tokenMacro(begin, end, started) {
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      return function (stream, state) {
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        if (!started && stream.match("{" + begin)) {
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          state.currentIndent += 1;
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          state.tokenize[state.tokenize.length - 1] = tokenMacro(begin, end, true);
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          return "meta";
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        }
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        if (stream.match(end + "}")) {
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          state.currentIndent -= 1;
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          state.tokenize.pop();
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          return "meta";
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        }
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        return tokenBase(stream, state);
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      };
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    }
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    function tokenMacroDef(stream, state) {
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      if (stream.eatSpace()) {
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        return null;
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      }
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      var matched;
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      if (matched = stream.match(idents)) {
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        if (matched == "def") {
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          return "keyword";
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        }
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        stream.eat(/[?!]/);
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      }
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      state.tokenize.pop();
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      return "def";
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    }
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    function tokenFollowIdent(stream, state) {
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      if (stream.eatSpace()) {
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        return null;
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      }
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      if (stream.match(idents)) {
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        stream.eat(/[!?]/);
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      } else {
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        stream.match(operators) || stream.match(conditionalOperators) || stream.match(indexingOperators);
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      }
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      state.tokenize.pop();
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      return "def";
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    }
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    function tokenFollowType(stream, state) {
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      if (stream.eatSpace()) {
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        return null;
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      }
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      stream.match(types);
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      state.tokenize.pop();
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      return "def";
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    }
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    function tokenQuote(end, style, embed) {
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      return function (stream, state) {
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        var escaped = false;
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        while (stream.peek()) {
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          if (!escaped) {
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            if (stream.match("{%", false)) {
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              state.tokenize.push(tokenMacro("%", "%"));
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              return style;
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            }
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            if (stream.match("{{", false)) {
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              state.tokenize.push(tokenMacro("{", "}"));
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              return style;
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            }
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            if (embed && stream.match("#{", false)) {
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              state.tokenize.push(tokenNest("#{", "}", "meta"));
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              return style;
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            }
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            var ch = stream.next();
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            if (ch == end) {
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              state.tokenize.pop();
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              return style;
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            }
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            escaped = embed && ch == "\\";
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          } else {
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            stream.next();
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            escaped = false;
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          }
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        }
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        return style;
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      };
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    }
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    function tokenHereDoc(phrase, embed) {
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      return function (stream, state) {
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        if (stream.sol()) {
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          stream.eatSpace()
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          if (stream.match(phrase)) {
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            state.tokenize.pop();
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            return "string";
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          }
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        }
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        var escaped = false;
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        while (stream.peek()) {
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          if (!escaped) {
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            if (stream.match("{%", false)) {
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              state.tokenize.push(tokenMacro("%", "%"));
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              return "string";
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            }
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            if (stream.match("{{", false)) {
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              state.tokenize.push(tokenMacro("{", "}"));
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              return "string";
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            }
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            if (embed && stream.match("#{", false)) {
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              state.tokenize.push(tokenNest("#{", "}", "meta"));
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              return "string";
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            }
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            escaped = embed && stream.next() == "\\";
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          } else {
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            stream.next();
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            escaped = false;
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          }
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        }
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        return "string";
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      }
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    }
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    return {
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      startState: function () {
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        return {
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          tokenize: [tokenBase],
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          currentIndent: 0,
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          lastToken: null,
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          lastStyle: null,
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          blocks: []
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        };
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      },
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      token: function (stream, state) {
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        var style = state.tokenize[state.tokenize.length - 1](stream, state);
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        var token = stream.current();
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        if (style && style != "comment") {
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          state.lastToken = token;
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          state.lastStyle = style;
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        }
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        return style;
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      },
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      indent: function (state, textAfter) {
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        textAfter = textAfter.replace(/^\s*(?:\{%)?\s*|\s*(?:%\})?\s*$/g, "");
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        if (dedentKeywords.test(textAfter) || dedentPunctuals.test(textAfter)) {
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          return config.indentUnit * (state.currentIndent - 1);
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        }
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        return config.indentUnit * state.currentIndent;
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      },
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      fold: "indent",
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      electricInput: wordRegExp(dedentPunctualsArray.concat(dedentKeywordsArray), true),
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      lineComment: '#'
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    };
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  });
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  CodeMirror.defineMIME("text/x-crystal", "crystal");
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});
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