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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.defineSimpleMode = function(name, states) {
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    CodeMirror.defineMode(name, function(config) {
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      return CodeMirror.simpleMode(config, states);
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    });
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  };
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  CodeMirror.simpleMode = function(config, states) {
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    ensureState(states, "start");
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    var states_ = {}, meta = states.meta || {}, hasIndentation = false;
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    for (var state in states) if (state != meta && states.hasOwnProperty(state)) {
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      var list = states_[state] = [], orig = states[state];
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      for (var i = 0; i < orig.length; i++) {
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        var data = orig[i];
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        list.push(new Rule(data, states));
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        if (data.indent || data.dedent) hasIndentation = true;
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      }
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    }
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    var mode = {
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      startState: function() {
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        return {state: "start", pending: null,
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                local: null, localState: null,
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                indent: hasIndentation ? [] : null};
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      },
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      copyState: function(state) {
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        var s = {state: state.state, pending: state.pending,
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                 local: state.local, localState: null,
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                 indent: state.indent && state.indent.slice(0)};
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        if (state.localState)
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          s.localState = CodeMirror.copyState(state.local.mode, state.localState);
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        if (state.stack)
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          s.stack = state.stack.slice(0);
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        for (var pers = state.persistentStates; pers; pers = pers.next)
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          s.persistentStates = {mode: pers.mode,
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                                spec: pers.spec,
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                                state: pers.state == state.localState ? s.localState : CodeMirror.copyState(pers.mode, pers.state),
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                                next: s.persistentStates};
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        return s;
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      },
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      token: tokenFunction(states_, config),
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      innerMode: function(state) { return state.local && {mode: state.local.mode, state: state.localState}; },
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      indent: indentFunction(states_, meta)
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    };
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    if (meta) for (var prop in meta) if (meta.hasOwnProperty(prop))
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      mode[prop] = meta[prop];
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    return mode;
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  };
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  function ensureState(states, name) {
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    if (!states.hasOwnProperty(name))
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      throw new Error("Undefined state " + name + " in simple mode");
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  }
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  function toRegex(val, caret) {
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    if (!val) return /(?:)/;
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    var flags = "";
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    if (val instanceof RegExp) {
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      if (val.ignoreCase) flags = "i";
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      if (val.unicode) flags += "u"
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      val = val.source;
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    } else {
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      val = String(val);
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    }
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    return new RegExp((caret === false ? "" : "^") + "(?:" + val + ")", flags);
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  }
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  function asToken(val) {
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    if (!val) return null;
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    if (val.apply) return val
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    if (typeof val == "string") return val.replace(/\./g, " ");
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    var result = [];
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    for (var i = 0; i < val.length; i++)
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      result.push(val[i] && val[i].replace(/\./g, " "));
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    return result;
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  }
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  function Rule(data, states) {
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    if (data.next || data.push) ensureState(states, data.next || data.push);
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    this.regex = toRegex(data.regex);
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    this.token = asToken(data.token);
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    this.data = data;
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  }
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  function tokenFunction(states, config) {
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    return function(stream, state) {
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      if (state.pending) {
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        var pend = state.pending.shift();
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        if (state.pending.length == 0) state.pending = null;
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        stream.pos += pend.text.length;
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        return pend.token;
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      }
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      if (state.local) {
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        if (state.local.end && stream.match(state.local.end)) {
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          var tok = state.local.endToken || null;
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          state.local = state.localState = null;
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          return tok;
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        } else {
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          var tok = state.local.mode.token(stream, state.localState), m;
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          if (state.local.endScan && (m = state.local.endScan.exec(stream.current())))
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            stream.pos = stream.start + m.index;
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          return tok;
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        }
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      }
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      var curState = states[state.state];
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      for (var i = 0; i < curState.length; i++) {
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        var rule = curState[i];
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        var matches = (!rule.data.sol || stream.sol()) && stream.match(rule.regex);
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        if (matches) {
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          if (rule.data.next) {
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            state.state = rule.data.next;
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          } else if (rule.data.push) {
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            (state.stack || (state.stack = [])).push(state.state);
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            state.state = rule.data.push;
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          } else if (rule.data.pop && state.stack && state.stack.length) {
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            state.state = state.stack.pop();
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          }
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          if (rule.data.mode)
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            enterLocalMode(config, state, rule.data.mode, rule.token);
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          if (rule.data.indent)
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            state.indent.push(stream.indentation() + config.indentUnit);
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          if (rule.data.dedent)
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            state.indent.pop();
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          var token = rule.token
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          if (token && token.apply) token = token(matches)
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          if (matches.length > 2 && rule.token && typeof rule.token != "string") {
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            for (var j = 2; j < matches.length; j++)
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              if (matches[j])
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                (state.pending || (state.pending = [])).push({text: matches[j], token: rule.token[j - 1]});
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            stream.backUp(matches[0].length - (matches[1] ? matches[1].length : 0));
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            return token[0];
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          } else if (token && token.join) {
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            return token[0];
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          } else {
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            return token;
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          }
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        }
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      }
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      stream.next();
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      return null;
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    };
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  }
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  function cmp(a, b) {
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    if (a === b) return true;
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    if (!a || typeof a != "object" || !b || typeof b != "object") return false;
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    var props = 0;
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    for (var prop in a) if (a.hasOwnProperty(prop)) {
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      if (!b.hasOwnProperty(prop) || !cmp(a[prop], b[prop])) return false;
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      props++;
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    }
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    for (var prop in b) if (b.hasOwnProperty(prop)) props--;
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    return props == 0;
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  }
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  function enterLocalMode(config, state, spec, token) {
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    var pers;
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    if (spec.persistent) for (var p = state.persistentStates; p && !pers; p = p.next)
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      if (spec.spec ? cmp(spec.spec, p.spec) : spec.mode == p.mode) pers = p;
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    var mode = pers ? pers.mode : spec.mode || CodeMirror.getMode(config, spec.spec);
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    var lState = pers ? pers.state : CodeMirror.startState(mode);
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    if (spec.persistent && !pers)
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      state.persistentStates = {mode: mode, spec: spec.spec, state: lState, next: state.persistentStates};
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    state.localState = lState;
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    state.local = {mode: mode,
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                   end: spec.end && toRegex(spec.end),
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                   endScan: spec.end && spec.forceEnd !== false && toRegex(spec.end, false),
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                   endToken: token && token.join ? token[token.length - 1] : token};
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  }
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  function indexOf(val, arr) {
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    for (var i = 0; i < arr.length; i++) if (arr[i] === val) return true;
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  }
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  function indentFunction(states, meta) {
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    return function(state, textAfter, line) {
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      if (state.local && state.local.mode.indent)
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        return state.local.mode.indent(state.localState, textAfter, line);
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      if (state.indent == null || state.local || meta.dontIndentStates && indexOf(state.state, meta.dontIndentStates) > -1)
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        return CodeMirror.Pass;
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      var pos = state.indent.length - 1, rules = states[state.state];
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      scan: for (;;) {
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        for (var i = 0; i < rules.length; i++) {
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          var rule = rules[i];
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          if (rule.data.dedent && rule.data.dedentIfLineStart !== false) {
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            var m = rule.regex.exec(textAfter);
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            if (m && m[0]) {
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              pos--;
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              if (rule.next || rule.push) rules = states[rule.next || rule.push];
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              textAfter = textAfter.slice(m[0].length);
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              continue scan;
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            }
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          }
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        }
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        break;
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      }
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      return pos < 0 ? 0 : state.indent[pos];
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    };
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  }
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});
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