// CodeMirror, copyright © by Marijn Haverbeke and others // Distributed under an MIT license: 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(“xquery”, function() {

// The keywords object is set to the result of this self executing
// function. Each keyword is a property of the keywords object whose
// value is {type: atype, style: astyle}
var keywords = function(){
  // conveinence functions used to build keywords object
  function kw(type) {return {type: type, style: "keyword"};}
  var A = kw("keyword a")
    , B = kw("keyword b")
    , C = kw("keyword c")
    , operator = kw("operator")
    , atom = {type: "atom", style: "atom"}
    , punctuation = {type: "punctuation", style: null}
    , qualifier = {type: "axis_specifier", style: "qualifier"};

  // kwObj is what is return from this function at the end
  var kwObj = {
    'if': A, 'switch': A, 'while': A, 'for': A,
    'else': B, 'then': B, 'try': B, 'finally': B, 'catch': B,
    'element': C, 'attribute': C, 'let': C, 'implements': C, 'import': C, 'module': C, 'namespace': C,
    'return': C, 'super': C, 'this': C, 'throws': C, 'where': C, 'private': C,
    ',': punctuation,
    'null': atom, 'fn:false()': atom, 'fn:true()': atom
  };

  // a list of 'basic' keywords. For each add a property to kwObj with the value of
  // {type: basic[i], style: "keyword"} e.g. 'after' --> {type: "after", style: "keyword"}
  var basic = ['after','ancestor','ancestor-or-self','and','as','ascending','assert','attribute','before',
  'by','case','cast','child','comment','declare','default','define','descendant','descendant-or-self',
  'descending','document','document-node','element','else','eq','every','except','external','following',
  'following-sibling','follows','for','function','if','import','in','instance','intersect','item',
  'let','module','namespace','node','node','of','only','or','order','parent','precedes','preceding',
  'preceding-sibling','processing-instruction','ref','return','returns','satisfies','schema','schema-element',
  'self','some','sortby','stable','text','then','to','treat','typeswitch','union','variable','version','where',
  'xquery', 'empty-sequence'];
  for(var i=0, l=basic.length; i < l; i++) { kwObj[basic[i]] = kw(basic[i]);};

  // a list of types. For each add a property to kwObj with the value of
  // {type: "atom", style: "atom"}
  var types = ['xs:string', 'xs:float', 'xs:decimal', 'xs:double', 'xs:integer', 'xs:boolean', 'xs:date', 'xs:dateTime',
  'xs:time', 'xs:duration', 'xs:dayTimeDuration', 'xs:time', 'xs:yearMonthDuration', 'numeric', 'xs:hexBinary',
  'xs:base64Binary', 'xs:anyURI', 'xs:QName', 'xs:byte','xs:boolean','xs:anyURI','xf:yearMonthDuration'];
  for(var i=0, l=types.length; i < l; i++) { kwObj[types[i]] = atom;};

  // each operator will add a property to kwObj with value of {type: "operator", style: "keyword"}
  var operators = ['eq', 'ne', 'lt', 'le', 'gt', 'ge', ':=', '=', '>', '>=', '<', '<=', '.', '|', '?', 'and', 'or', 'div', 'idiv', 'mod', '*', '/', '+', '-'];
  for(var i=0, l=operators.length; i < l; i++) { kwObj[operators[i]] = operator;};

  // each axis_specifiers will add a property to kwObj with value of {type: "axis_specifier", style: "qualifier"}
  var axis_specifiers = ["self::", "attribute::", "child::", "descendant::", "descendant-or-self::", "parent::",
  "ancestor::", "ancestor-or-self::", "following::", "preceding::", "following-sibling::", "preceding-sibling::"];
  for(var i=0, l=axis_specifiers.length; i < l; i++) { kwObj[axis_specifiers[i]] = qualifier; };

  return kwObj;
}();

// Used as scratch variables to communicate multiple values without
// consing up tons of objects.
var type, content;

function ret(tp, style, cont) {
  type = tp; content = cont;
  return style;
}

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

// the primary mode tokenizer
function tokenBase(stream, state) {
  var ch = stream.next(),
      mightBeFunction = false,
      isEQName = isEQNameAhead(stream);

  // an XML tag (if not in some sub, chained tokenizer)
  if (ch == "<") {
    if(stream.match("!--", true))
      return chain(stream, state, tokenXMLComment);

    if(stream.match("![CDATA", false)) {
      state.tokenize = tokenCDATA;
      return ret("tag", "tag");
    }

    if(stream.match("?", false)) {
      return chain(stream, state, tokenPreProcessing);
    }

    var isclose = stream.eat("/");
    stream.eatSpace();
    var tagName = "", c;
    while ((c = stream.eat(/[^\s\u00a0=<>\"\'\/?]/))) tagName += c;

    return chain(stream, state, tokenTag(tagName, isclose));
  }
  // start code block
  else if(ch == "{") {
    pushStateStack(state,{ type: "codeblock"});
    return ret("", null);
  }
  // end code block
  else if(ch == "}") {
    popStateStack(state);
    return ret("", null);
  }
  // if we're in an XML block
  else if(isInXmlBlock(state)) {
    if(ch == ">")
      return ret("tag", "tag");
    else if(ch == "/" && stream.eat(">")) {
      popStateStack(state);
      return ret("tag", "tag");
    }
    else
      return ret("word", "variable");
  }
  // if a number
  else if (/\d/.test(ch)) {
    stream.match(/^\d*(?:\.\d*)?(?:E[+\-]?\d+)?/);
    return ret("number", "atom");
  }
  // comment start
  else if (ch === "(" && stream.eat(":")) {
    pushStateStack(state, { type: "comment"});
    return chain(stream, state, tokenComment);
  }
  // quoted string
  else if (  !isEQName && (ch === '"' || ch === "'"))
    return chain(stream, state, tokenString(ch));
  // variable
  else if(ch === "$") {
    return chain(stream, state, tokenVariable);
  }
  // assignment
  else if(ch ===":" && stream.eat("=")) {
    return ret("operator", "keyword");
  }
  // open paren
  else if(ch === "(") {
    pushStateStack(state, { type: "paren"});
    return ret("", null);
  }
  // close paren
  else if(ch === ")") {
    popStateStack(state);
    return ret("", null);
  }
  // open paren
  else if(ch === "[") {
    pushStateStack(state, { type: "bracket"});
    return ret("", null);
  }
  // close paren
  else if(ch === "]") {
    popStateStack(state);
    return ret("", null);
  }
  else {
    var known = keywords.propertyIsEnumerable(ch) && keywords[ch];

    // if there's a EQName ahead, consume the rest of the string portion, it's likely a function
    if(isEQName && ch === '\"') while(stream.next() !== '"'){}
    if(isEQName && ch === '\'') while(stream.next() !== '\''){}

    // gobble up a word if the character is not known
    if(!known) stream.eatWhile(/[\w\$_-]/);

    // gobble a colon in the case that is a lib func type call fn:doc
    var foundColon = stream.eat(":");

    // if there's not a second colon, gobble another word. Otherwise, it's probably an axis specifier
    // which should get matched as a keyword
    if(!stream.eat(":") && foundColon) {
      stream.eatWhile(/[\w\$_-]/);
    }
    // if the next non whitespace character is an open paren, this is probably a function (if not a keyword of other sort)
    if(stream.match(/^[ \t]*\(/, false)) {
      mightBeFunction = true;
    }
    // is the word a keyword?
    var word = stream.current();
    known = keywords.propertyIsEnumerable(word) && keywords[word];

    // if we think it's a function call but not yet known,
    // set style to variable for now for lack of something better
    if(mightBeFunction && !known) known = {type: "function_call", style: "variable def"};

    // if the previous word was element, attribute, axis specifier, this word should be the name of that
    if(isInXmlConstructor(state)) {
      popStateStack(state);
      return ret("word", "variable", word);
    }
    // as previously checked, if the word is element,attribute, axis specifier, call it an "xmlconstructor" and
    // push the stack so we know to look for it on the next word
    if(word == "element" || word == "attribute" || known.type == "axis_specifier") pushStateStack(state, {type: "xmlconstructor"});

    // if the word is known, return the details of that else just call this a generic 'word'
    return known ? ret(known.type, known.style, word) :
                   ret("word", "variable", word);
  }
}

// handle comments, including nested
function tokenComment(stream, state) {
  var maybeEnd = false, maybeNested = false, nestedCount = 0, ch;
  while (ch = stream.next()) {
    if (ch == ")" && maybeEnd) {
      if(nestedCount > 0)
        nestedCount--;
      else {
        popStateStack(state);
        break;
      }
    }
    else if(ch == ":" && maybeNested) {
      nestedCount++;
    }
    maybeEnd = (ch == ":");
    maybeNested = (ch == "(");
  }

  return ret("comment", "comment");
}

// tokenizer for string literals
// optionally pass a tokenizer function to set state.tokenize back to when finished
function tokenString(quote, f) {
  return function(stream, state) {
    var ch;

    if(isInString(state) && stream.current() == quote) {
      popStateStack(state);
      if(f) state.tokenize = f;
      return ret("string", "string");
    }

    pushStateStack(state, { type: "string", name: quote, tokenize: tokenString(quote, f) });

    // if we're in a string and in an XML block, allow an embedded code block
    if(stream.match("{", false) && isInXmlAttributeBlock(state)) {
      state.tokenize = tokenBase;
      return ret("string", "string");
    }

    while (ch = stream.next()) {
      if (ch ==  quote) {
        popStateStack(state);
        if(f) state.tokenize = f;
        break;
      }
      else {
        // if we're in a string and in an XML block, allow an embedded code block in an attribute
        if(stream.match("{", false) && isInXmlAttributeBlock(state)) {
          state.tokenize = tokenBase;
          return ret("string", "string");
        }

      }
    }

    return ret("string", "string");
  };
}

// tokenizer for variables
function tokenVariable(stream, state) {
  var isVariableChar = /[\w\$_-]/;

  // a variable may start with a quoted EQName so if the next character is quote, consume to the next quote
  if(stream.eat("\"")) {
    while(stream.next() !== '\"'){};
    stream.eat(":");
  } else {
    stream.eatWhile(isVariableChar);
    if(!stream.match(":=", false)) stream.eat(":");
  }
  stream.eatWhile(isVariableChar);
  state.tokenize = tokenBase;
  return ret("variable", "variable");
}

// tokenizer for XML tags
function tokenTag(name, isclose) {
  return function(stream, state) {
    stream.eatSpace();
    if(isclose && stream.eat(">")) {
      popStateStack(state);
      state.tokenize = tokenBase;
      return ret("tag", "tag");
    }
    // self closing tag without attributes?
    if(!stream.eat("/"))
      pushStateStack(state, { type: "tag", name: name, tokenize: tokenBase});
    if(!stream.eat(">")) {
      state.tokenize = tokenAttribute;
      return ret("tag", "tag");
    }
    else {
      state.tokenize = tokenBase;
    }
    return ret("tag", "tag");
  };
}

// tokenizer for XML attributes
function tokenAttribute(stream, state) {
  var ch = stream.next();

  if(ch == "/" && stream.eat(">")) {
    if(isInXmlAttributeBlock(state)) popStateStack(state);
    if(isInXmlBlock(state)) popStateStack(state);
    return ret("tag", "tag");
  }
  if(ch == ">") {
    if(isInXmlAttributeBlock(state)) popStateStack(state);
    return ret("tag", "tag");
  }
  if(ch == "=")
    return ret("", null);
  // quoted string
  if (ch == '"' || ch == "'")
    return chain(stream, state, tokenString(ch, tokenAttribute));

  if(!isInXmlAttributeBlock(state))
    pushStateStack(state, { type: "attribute", tokenize: tokenAttribute});

  stream.eat(/[a-zA-Z_:]/);
  stream.eatWhile(/[-a-zA-Z0-9_:.]/);
  stream.eatSpace();

  // the case where the attribute has not value and the tag was closed
  if(stream.match(">", false) || stream.match("/", false)) {
    popStateStack(state);
    state.tokenize = tokenBase;
  }

  return ret("attribute", "attribute");
}

// handle comments, including nested
function tokenXMLComment(stream, state) {
  var ch;
  while (ch = stream.next()) {
    if (ch == "-" && stream.match("->", true)) {
      state.tokenize = tokenBase;
      return ret("comment", "comment");
    }
  }
}

// handle CDATA
function tokenCDATA(stream, state) {
  var ch;
  while (ch = stream.next()) {
    if (ch == "]" && stream.match("]", true)) {
      state.tokenize = tokenBase;
      return ret("comment", "comment");
    }
  }
}

// handle preprocessing instructions
function tokenPreProcessing(stream, state) {
  var ch;
  while (ch = stream.next()) {
    if (ch == "?" && stream.match(">", true)) {
      state.tokenize = tokenBase;
      return ret("comment", "comment meta");
    }
  }
}

// functions to test the current context of the state
function isInXmlBlock(state) { return isIn(state, "tag"); }
function isInXmlAttributeBlock(state) { return isIn(state, "attribute"); }
function isInXmlConstructor(state) { return isIn(state, "xmlconstructor"); }
function isInString(state) { return isIn(state, "string"); }

function isEQNameAhead(stream) {
  // assume we've already eaten a quote (")
  if(stream.current() === '"')
    return stream.match(/^[^\"]+\"\:/, false);
  else if(stream.current() === '\'')
    return stream.match(/^[^\"]+\'\:/, false);
  else
    return false;
}

function isIn(state, type) {
  return (state.stack.length && state.stack[state.stack.length - 1].type == type);
}

function pushStateStack(state, newState) {
  state.stack.push(newState);
}

function popStateStack(state) {
  state.stack.pop();
  var reinstateTokenize = state.stack.length && state.stack[state.stack.length-1].tokenize;
  state.tokenize = reinstateTokenize || tokenBase;
}

// the interface for the mode API
return {
  startState: function() {
    return {
      tokenize: tokenBase,
      cc: [],
      stack: []
    };
  },

  token: function(stream, state) {
    if (stream.eatSpace()) return null;
    var style = state.tokenize(stream, state);
    return style;
  },

  blockCommentStart: "(:",
  blockCommentEnd: ":)"

};

});

CodeMirror.defineMIME(“application/xquery”, “xquery”);

});