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

(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("crystal", function(config) {
    function wordRegExp(words, end) {
      return new RegExp((end ? "" : "^") + "(?:" + words.join("|") + ")" + (end ? "$" : "\\b"));
    }

function chain(tokenize, stream, state) {
      state.tokenize.push(tokenize);
      return tokenize(stream, state);
    }

function tokenBase(stream, state) {
      if (stream.eatSpace()) {
        return null;
      }

// Macros
      if (state.lastToken != "\\" && stream.match("{%", false)) {
        return chain(tokenMacro("%", "%"), stream, state);
      }

if (state.lastToken != "\\" && stream.match("{{", false)) {
        return chain(tokenMacro("{", "}"), stream, state);
      }

// Comments
      if (stream.peek() == "#") {
        stream.skipToEnd();
        return "comment";
      }

// Variables and keywords
      var matched;
      if (stream.match(idents)) {
        stream.eat(/[?!]/);

matched = stream.current();
        if (stream.eat(":")) {
          return "atom";
        } else if (state.lastToken == ".") {
          return "property";
        } else if (keywords.test(matched)) {
          if (state.lastToken != "abstract" && indentKeywords.test(matched)) {
            if (!(matched == "fun" && state.blocks.indexOf("lib") >= 0)) {
              state.blocks.push(matched);
              state.currentIndent += 1;
            }
          } else if (dedentKeywords.test(matched)) {
            state.blocks.pop();
            state.currentIndent -= 1;
          }

if (nextTokenizer.hasOwnProperty(matched)) {
            state.tokenize.push(nextTokenizer[matched]);
          }

return "keyword";
        } else if (atomWords.test(matched)) {
          return "atom";
        }

return "variable";
      }

// Class variables and instance variables
      // or attributes
      if (stream.eat("@")) {
        if (stream.peek() == "[") {
          return chain(tokenNest("[", "]", "meta"), stream, state);
        }

stream.eat("@");
        stream.match(idents) || stream.match(types);
        return "variable-2";
      }

// Global variables
      if (stream.eat("$")) {
        stream.eat(/[0-9]+|\?/) || stream.match(idents) || stream.match(types);
        return "variable-3";
      }

// Constants and types
      if (stream.match(types)) {
        return "tag";
      }

// Symbols or ':' operator
      if (stream.eat(":")) {
        if (stream.eat("\"")) {
          return chain(tokenQuote("\"", "atom", false), stream, state);
        } else if (stream.match(idents) || stream.match(types) ||
                   stream.match(operators) || stream.match(conditionalOperators) || stream.match(indexingOperators)) {
          return "atom";
        }
        stream.eat(":");
        return "operator";
      }

// Strings
      if (stream.eat("\"")) {
        return chain(tokenQuote("\"", "string", true), stream, state);
      }

// Strings or regexps or macro variables or '%' operator
      if (stream.peek() == "%") {
        var style = "string";
        var embed = true;
        var delim;

if (stream.match("%r")) {
          // Regexps
          style = "string-2";
          delim = stream.next();
        } else if (stream.match("%w")) {
          embed = false;
          delim = stream.next();
        } else {
          if(delim = stream.match(/^%([^\w\s=])/)) {
            delim = delim[1];
          } else if (stream.match(/^%[a-zA-Z0-9_\u009F-\uFFFF]*/)) {
            // Macro variables
            return "meta";
          } else {
            // '%' operator
            return "operator";
          }
        }

if (matching.hasOwnProperty(delim)) {
          delim = matching[delim];
        }
        return chain(tokenQuote(delim, style, embed), stream, state);
      }

// Characters
      if (stream.eat("'")) {
        stream.match(/^(?:[^']|\\(?:[befnrtv0'"]|[0-7]{3}|u(?:[0-9a-fA-F]{4}|\{[0-9a-fA-F]{1,6}\})))/);
        stream.eat("'");
        return "atom";
      }

// Numbers
      if (stream.eat("0")) {
        if (stream.eat("x")) {
          stream.match(/^[0-9a-fA-F]+/);
        } else if (stream.eat("o")) {
          stream.match(/^[0-7]+/);
        } else if (stream.eat("b")) {
          stream.match(/^[01]+/);
        }
        return "number";
      }

if (stream.eat(/\d/)) {
        stream.match(/^\d*(?:\.\d+)?(?:[eE][+-]?\d+)?/);
        return "number";
      }

// Operators
      if (stream.match(operators)) {
        stream.eat("="); // Operators can follow assign symbol.
        return "operator";
      }

if (stream.match(conditionalOperators) || stream.match(anotherOperators)) {
        return "operator";
      }

// Parens and braces
      if (matched = stream.match(/[({[]/, false)) {
        matched = matched[0];
        return chain(tokenNest(matched, matching[matched], null), stream, state);
      }

// Escapes
      if (stream.eat("\\")) {
        stream.next();
        return "meta";
      }

stream.next();
      return null;
    }

function tokenNest(begin, end, style, started) {
      return function (stream, state) {
        if (!started && stream.match(begin)) {
          state.tokenize[state.tokenize.length - 1] = tokenNest(begin, end, style, true);
          state.currentIndent += 1;
          return style;
        }

var nextStyle = tokenBase(stream, state);
        if (stream.current() === end) {
          state.tokenize.pop();
          state.currentIndent -= 1;
          nextStyle = style;
        }

return nextStyle;
      };
    }

function tokenMacro(begin, end, started) {
      return function (stream, state) {
        if (!started && stream.match("{" + begin)) {
          state.currentIndent += 1;
          state.tokenize[state.tokenize.length - 1] = tokenMacro(begin, end, true);
          return "meta";
        }

if (stream.match(end + "}")) {
          state.currentIndent -= 1;
          state.tokenize.pop();
          return "meta";
        }

return tokenBase(stream, state);
      };
    }

function tokenMacroDef(stream, state) {
      if (stream.eatSpace()) {
        return null;
      }

var matched;
      if (matched = stream.match(idents)) {
        if (matched == "def") {
          return "keyword";
        }
        stream.eat(/[?!]/);
      }

state.tokenize.pop();
      return "def";
    }

function tokenFollowIdent(stream, state) {
      if (stream.eatSpace()) {
        return null;
      }

if (stream.match(idents)) {
        stream.eat(/[!?]/);
      } else {
        stream.match(operators) || stream.match(conditionalOperators) || stream.match(indexingOperators);
      }
      state.tokenize.pop();
      return "def";
    }

function tokenFollowType(stream, state) {
      if (stream.eatSpace()) {
        return null;
      }

stream.match(types);
      state.tokenize.pop();
      return "def";
    }

function tokenQuote(end, style, embed) {
      return function (stream, state) {
        var escaped = false;

while (stream.peek()) {
          if (!escaped) {
            if (stream.match("{%", false)) {
              state.tokenize.push(tokenMacro("%", "%"));
              return style;
            }

if (stream.match("{{", false)) {
              state.tokenize.push(tokenMacro("{", "}"));
              return style;
            }

if (embed && stream.match("#{", false)) {
              state.tokenize.push(tokenNest("#{", "}", "meta"));
              return style;
            }

var ch = stream.next();

if (ch == end) {
              state.tokenize.pop();
              return style;
            }

escaped = ch == "\\";
          } else {
            stream.next();
            escaped = false;
          }
        }

return style;
      };
    }

return {
      startState: function () {
        return {
          tokenize: [tokenBase],
          currentIndent: 0,
          lastToken: null,
          blocks: []
        };
      },

token: function (stream, state) {
        var style = state.tokenize[state.tokenize.length - 1](stream, state);
        var token = stream.current();

if (style && style != "comment") {
          state.lastToken = token;
        }

return style;
      },

indent: function (state, textAfter) {
        textAfter = textAfter.replace(/^\s*(?:\{%)?\s*|\s*(?:%\})?\s*$/g, "");

if (dedentKeywords.test(textAfter) || dedentPunctuals.test(textAfter)) {
          return config.indentUnit * (state.currentIndent - 1);
        }

return config.indentUnit * state.currentIndent;
      },

fold: "indent",
      electricInput: wordRegExp(dedentPunctualsArray.concat(dedentKeywordsArray), true),
      lineComment: '#'
    };
  });

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

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