1// CodeMirror, copyright (c) by Marijn Haverbeke and others
  2// Distributed under an MIT license: https://codemirror.net/LICENSE
  3
  4(function(mod) {
  5  if (typeof exports == "object" && typeof module == "object") // CommonJS
  6    mod(require("../../lib/codemirror"));
  7  else if (typeof define == "function" && define.amd) // AMD
  8    define(["../../lib/codemirror"], mod);
  9  else // Plain browser env
 10    mod(CodeMirror);
 11})(function(CodeMirror) {
 12  "use strict";
 13
 14  CodeMirror.defineSimpleMode = function(name, states) {
 15    CodeMirror.defineMode(name, function(config) {
 16      return CodeMirror.simpleMode(config, states);
 17    });
 18  };
 19
 20  CodeMirror.simpleMode = function(config, states) {
 21    ensureState(states, "start");
 22    var states_ = {}, meta = states.meta || {}, hasIndentation = false;
 23    for (var state in states) if (state != meta && states.hasOwnProperty(state)) {
 24      var list = states_[state] = [], orig = states[state];
 25      for (var i = 0; i < orig.length; i++) {
 26        var data = orig[i];
 27        list.push(new Rule(data, states));
 28        if (data.indent || data.dedent) hasIndentation = true;
 29      }
 30    }
 31    var mode = {
 32      startState: function() {
 33        return {state: "start", pending: null,
 34                local: null, localState: null,
 35                indent: hasIndentation ? [] : null};
 36      },
 37      copyState: function(state) {
 38        var s = {state: state.state, pending: state.pending,
 39                 local: state.local, localState: null,
 40                 indent: state.indent && state.indent.slice(0)};
 41        if (state.localState)
 42          s.localState = CodeMirror.copyState(state.local.mode, state.localState);
 43        if (state.stack)
 44          s.stack = state.stack.slice(0);
 45        for (var pers = state.persistentStates; pers; pers = pers.next)
 46          s.persistentStates = {mode: pers.mode,
 47                                spec: pers.spec,
 48                                state: pers.state == state.localState ? s.localState : CodeMirror.copyState(pers.mode, pers.state),
 49                                next: s.persistentStates};
 50        return s;
 51      },
 52      token: tokenFunction(states_, config),
 53      innerMode: function(state) { return state.local && {mode: state.local.mode, state: state.localState}; },
 54      indent: indentFunction(states_, meta)
 55    };
 56    if (meta) for (var prop in meta) if (meta.hasOwnProperty(prop))
 57      mode[prop] = meta[prop];
 58    return mode;
 59  };
 60
 61  function ensureState(states, name) {
 62    if (!states.hasOwnProperty(name))
 63      throw new Error("Undefined state " + name + " in simple mode");
 64  }
 65
 66  function toRegex(val, caret) {
 67    if (!val) return /(?:)/;
 68    var flags = "";
 69    if (val instanceof RegExp) {
 70      if (val.ignoreCase) flags = "i";
 71      val = val.source;
 72    } else {
 73      val = String(val);
 74    }
 75    return new RegExp((caret === false ? "" : "^") + "(?:" + val + ")", flags);
 76  }
 77
 78  function asToken(val) {
 79    if (!val) return null;
 80    if (val.apply) return val
 81    if (typeof val == "string") return val.replace(/\./g, " ");
 82    var result = [];
 83    for (var i = 0; i < val.length; i++)
 84      result.push(val[i] && val[i].replace(/\./g, " "));
 85    return result;
 86  }
 87
 88  function Rule(data, states) {
 89    if (data.next || data.push) ensureState(states, data.next || data.push);
 90    this.regex = toRegex(data.regex);
 91    this.token = asToken(data.token);
 92    this.data = data;
 93  }
 94
 95  function tokenFunction(states, config) {
 96    return function(stream, state) {
 97      if (state.pending) {
 98        var pend = state.pending.shift();
 99        if (state.pending.length == 0) state.pending = null;
100        stream.pos += pend.text.length;
101        return pend.token;
102      }
103
104      if (state.local) {
105        if (state.local.end && stream.match(state.local.end)) {
106          var tok = state.local.endToken || null;
107          state.local = state.localState = null;
108          return tok;
109        } else {
110          var tok = state.local.mode.token(stream, state.localState), m;
111          if (state.local.endScan && (m = state.local.endScan.exec(stream.current())))
112            stream.pos = stream.start + m.index;
113          return tok;
114        }
115      }
116
117      var curState = states[state.state];
118      for (var i = 0; i < curState.length; i++) {
119        var rule = curState[i];
120        var matches = (!rule.data.sol || stream.sol()) && stream.match(rule.regex);
121        if (matches) {
122          if (rule.data.next) {
123            state.state = rule.data.next;
124          } else if (rule.data.push) {
125            (state.stack || (state.stack = [])).push(state.state);
126            state.state = rule.data.push;
127          } else if (rule.data.pop && state.stack && state.stack.length) {
128            state.state = state.stack.pop();
129          }
130
131          if (rule.data.mode)
132            enterLocalMode(config, state, rule.data.mode, rule.token);
133          if (rule.data.indent)
134            state.indent.push(stream.indentation() + config.indentUnit);
135          if (rule.data.dedent)
136            state.indent.pop();
137          var token = rule.token
138          if (token && token.apply) token = token(matches)
139          if (matches.length > 2 && rule.token && typeof rule.token != "string") {
140            state.pending = [];
141            for (var j = 2; j < matches.length; j++)
142              if (matches[j])
143                state.pending.push({text: matches[j], token: rule.token[j - 1]});
144            stream.backUp(matches[0].length - (matches[1] ? matches[1].length : 0));
145            return token[0];
146          } else if (token && token.join) {
147            return token[0];
148          } else {
149            return token;
150          }
151        }
152      }
153      stream.next();
154      return null;
155    };
156  }
157
158  function cmp(a, b) {
159    if (a === b) return true;
160    if (!a || typeof a != "object" || !b || typeof b != "object") return false;
161    var props = 0;
162    for (var prop in a) if (a.hasOwnProperty(prop)) {
163      if (!b.hasOwnProperty(prop) || !cmp(a[prop], b[prop])) return false;
164      props++;
165    }
166    for (var prop in b) if (b.hasOwnProperty(prop)) props--;
167    return props == 0;
168  }
169
170  function enterLocalMode(config, state, spec, token) {
171    var pers;
172    if (spec.persistent) for (var p = state.persistentStates; p && !pers; p = p.next)
173      if (spec.spec ? cmp(spec.spec, p.spec) : spec.mode == p.mode) pers = p;
174    var mode = pers ? pers.mode : spec.mode || CodeMirror.getMode(config, spec.spec);
175    var lState = pers ? pers.state : CodeMirror.startState(mode);
176    if (spec.persistent && !pers)
177      state.persistentStates = {mode: mode, spec: spec.spec, state: lState, next: state.persistentStates};
178
179    state.localState = lState;
180    state.local = {mode: mode,
181                   end: spec.end && toRegex(spec.end),
182                   endScan: spec.end && spec.forceEnd !== false && toRegex(spec.end, false),
183                   endToken: token && token.join ? token[token.length - 1] : token};
184  }
185
186  function indexOf(val, arr) {
187    for (var i = 0; i < arr.length; i++) if (arr[i] === val) return true;
188  }
189
190  function indentFunction(states, meta) {
191    return function(state, textAfter, line) {
192      if (state.local && state.local.mode.indent)
193        return state.local.mode.indent(state.localState, textAfter, line);
194      if (state.indent == null || state.local || meta.dontIndentStates && indexOf(state.state, meta.dontIndentStates) > -1)
195        return CodeMirror.Pass;
196
197      var pos = state.indent.length - 1, rules = states[state.state];
198      scan: for (;;) {
199        for (var i = 0; i < rules.length; i++) {
200          var rule = rules[i];
201          if (rule.data.dedent && rule.data.dedentIfLineStart !== false) {
202            var m = rule.regex.exec(textAfter);
203            if (m && m[0]) {
204              pos--;
205              if (rule.next || rule.push) rules = states[rule.next || rule.push];
206              textAfter = textAfter.slice(m[0].length);
207              continue scan;
208            }
209          }
210        }
211        break;
212      }
213      return pos < 0 ? 0 : state.indent[pos];
214    };
215  }
216});