// 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"), require("../htmlmixed/htmlmixed"));
else if (typeof define == "function" && define.amd) // AMD
  define(["../../lib/codemirror", "../htmlmixed/htmlmixed"], mod);
else // Plain browser env
  mod(CodeMirror);

})(function(CodeMirror) {

"use strict";

var indentingTags = ["template", "literal", "msg", "fallbackmsg", "let", "if", "elseif",
                     "else", "switch", "case", "default", "foreach", "ifempty", "for",
                     "call", "param", "deltemplate", "delcall", "log"];

CodeMirror.defineMode("soy", function(config) {
  var textMode = CodeMirror.getMode(config, "text/plain");
  var modes = {
    html: CodeMirror.getMode(config, {name: "text/html", multilineTagIndentFactor: 2, multilineTagIndentPastTag: false}),
    attributes: textMode,
    text: textMode,
    uri: textMode,
    css: CodeMirror.getMode(config, "text/css"),
    js: CodeMirror.getMode(config, {name: "text/javascript", statementIndent: 2 * config.indentUnit})
  };

  function last(array) {
    return array[array.length - 1];
  }

  function tokenUntil(stream, state, untilRegExp) {
    if (stream.sol()) {
      for (var indent = 0; indent < state.indent; indent++) {
        if (!stream.eat(/\s/)) break;
      }
      if (indent) return null;
    }
    var oldString = stream.string;
    var match = untilRegExp.exec(oldString.substr(stream.pos));
    if (match) {
      // We don't use backUp because it backs up just the position, not the state.
      // This uses an undocumented API.
      stream.string = oldString.substr(0, stream.pos + match.index);
    }
    var result = stream.hideFirstChars(state.indent, function() {
      var localState = last(state.localStates);
      return localState.mode.token(stream, localState.state);
    });
    stream.string = oldString;
    return result;
  }

  function contains(list, element) {
    while (list) {
      if (list.element === element) return true;
      list = list.next;
    }
    return false;
  }

  function prepend(list, element) {
    return {
      element: element,
      next: list
    };
  }

  // Reference a variable `name` in `list`.
  // Let `loose` be truthy to ignore missing identifiers.
  function ref(list, name, loose) {
    return contains(list, name) ? "variable-2" : (loose ? "variable" : "variable-2 error");
  }

  function popscope(state) {
    if (state.scopes) {
      state.variables = state.scopes.element;
      state.scopes = state.scopes.next;
    }
  }

  return {
    startState: function() {
      return {
        kind: [],
        kindTag: [],
        soyState: [],
        templates: null,
        variables: null,
        scopes: null,
        indent: 0,
        quoteKind: null,
        localStates: [{
          mode: modes.html,
          state: CodeMirror.startState(modes.html)
        }]
      };
    },

    copyState: function(state) {
      return {
        tag: state.tag, // Last seen Soy tag.
        kind: state.kind.concat([]), // Values of kind="" attributes.
        kindTag: state.kindTag.concat([]), // Opened tags with kind="" attributes.
        soyState: state.soyState.concat([]),
        templates: state.templates,
        variables: state.variables,
        scopes: state.scopes,
        indent: state.indent, // Indentation of the following line.
        quoteKind: state.quoteKind,
        localStates: state.localStates.map(function(localState) {
          return {
            mode: localState.mode,
            state: CodeMirror.copyState(localState.mode, localState.state)
          };
        })
      };
    },

    token: function(stream, state) {
      var match;

      switch (last(state.soyState)) {
        case "comment":
          if (stream.match(/^.*?\*\//)) {
            state.soyState.pop();
          } else {
            stream.skipToEnd();
          }
          return "comment";

        case "templ-def":
          if (match = stream.match(/^\.?([\w]+(?!\.[\w]+)*)/)) {
            state.templates = prepend(state.templates, match[1]);
            state.scopes = prepend(state.scopes, state.variables);
            state.soyState.pop();
            return "def";
          }
          stream.next();
          return null;

        case "templ-ref":
          if (match = stream.match(/^\.?([\w]+)/)) {
            state.soyState.pop();
            // If the first character is '.', try to match against a local template name.
            if (match[0][0] == '.') {
              return ref(state.templates, match[1], true);
            }
            // Otherwise
            return "variable";
          }
          stream.next();
          return null;

        case "param-def":
          if (match = stream.match(/^\w+/)) {
            state.variables = prepend(state.variables, match[0]);
            state.soyState.pop();
            state.soyState.push("param-type");
            return "def";
          }
          stream.next();
          return null;

        case "param-type":
          if (stream.peek() == "}") {
            state.soyState.pop();
            return null;
          }
          if (stream.eatWhile(/^[\w]+/)) {
            return "variable-3";
          }
          stream.next();
          return null;

        case "var-def":
          if (match = stream.match(/^\$([\w]+)/)) {
            state.variables = prepend(state.variables, match[1]);
            state.soyState.pop();
            return "def";
          }
          stream.next();
          return null;

        case "tag":
          if (stream.match(/^\/?}/)) {
            if (state.tag == "/template" || state.tag == "/deltemplate") {
              popscope(state);
              state.indent = 0;
            } else {
              if (state.tag == "/for" || state.tag == "/foreach") {
                popscope(state);
              }
              state.indent -= config.indentUnit *
                  (stream.current() == "/}" || indentingTags.indexOf(state.tag) == -1 ? 2 : 1);
            }
            state.soyState.pop();
            return "keyword";
          } else if (stream.match(/^([\w?]+)(?==)/)) {
            if (stream.current() == "kind" && (match = stream.match(/^="([^"]+)/, false))) {
              var kind = match[1];
              state.kind.push(kind);
              state.kindTag.push(state.tag);
              var mode = modes[kind] || modes.html;
              var localState = last(state.localStates);
              if (localState.mode.indent) {
                state.indent += localState.mode.indent(localState.state, "");
              }
              state.localStates.push({
                mode: mode,
                state: CodeMirror.startState(mode)
              });
            }
            return "attribute";
          } else if (match = stream.match(/^["']/)) {
            state.soyState.push("string");
            state.quoteKind = match;
            return "string";
          }
          if (match = stream.match(/^\$([\w]+)/)) {
            return ref(state.variables, match[1]);
          }
          if (match = stream.match(/^\w+/)) {
            return /^(?:as|and|or|not|in)$/.test(match[0]) ? "keyword" : null;
          }
          stream.next();
          return null;

        case "literal":
          if (stream.match(/^(?=\{\/literal})/)) {
            state.indent -= config.indentUnit;
            state.soyState.pop();
            return this.token(stream, state);
          }
          return tokenUntil(stream, state, /\{\/literal}/);

        case "string":
          var match = stream.match(/^.*?(["']|\\[\s\S])/);
          if (!match) {
            stream.skipToEnd();
          } else if (match[1] == state.quoteKind) {
            state.quoteKind = null;
            state.soyState.pop();
          }
          return "string";
      }

      if (stream.match(/^\/\*/)) {
        state.soyState.push("comment");
        return "comment";
      } else if (stream.match(stream.sol() ? /^\s*\/\/.*/ : /^\s+\/\/.*/)) {
        return "comment";
      } else if (stream.match(/^\{literal}/)) {
        state.indent += config.indentUnit;
        state.soyState.push("literal");
        return "keyword";

      // A tag-keyword must be followed by whitespace or a closing tag.
      } else if (match = stream.match(/^\{([\/@\\]?\w+\??)(?=[\s\}])/)) {
        if (match[1] != "/switch")
          state.indent += (/^(\/|(else|elseif|ifempty|case|fallbackmsg|default)$)/.test(match[1]) && state.tag != "switch" ? 1 : 2) * config.indentUnit;
        state.tag = match[1];
        if (state.tag == "/" + last(state.kindTag)) {
          // We found the tag that opened the current kind="".
          state.kind.pop();
          state.kindTag.pop();
          state.localStates.pop();
          var localState = last(state.localStates);
          if (localState.mode.indent) {
            state.indent -= localState.mode.indent(localState.state, "");
          }
        }
        state.soyState.push("tag");
        if (state.tag == "template" || state.tag == "deltemplate") {
          state.soyState.push("templ-def");
        }
        if (state.tag == "call" || state.tag == "delcall") {
          state.soyState.push("templ-ref");
        }
        if (state.tag == "let") {
          state.soyState.push("var-def");
        }
        if (state.tag == "for" || state.tag == "foreach") {
          state.scopes = prepend(state.scopes, state.variables);
          state.soyState.push("var-def");
        }
        if (state.tag.match(/^@(?:param\??|inject)/)) {
          state.soyState.push("param-def");
        }
        return "keyword";

      // Not a tag-keyword; it's an implicit print tag.
      } else if (stream.eat('{')) {
        state.tag = "print";
        state.indent += 2 * config.indentUnit;
        state.soyState.push("tag");
        return "keyword";
      }

      return tokenUntil(stream, state, /\{|\s+\/\/|\/\*/);
    },

    indent: function(state, textAfter) {
      var indent = state.indent, top = last(state.soyState);
      if (top == "comment") return CodeMirror.Pass;

      if (top == "literal") {
        if (/^\{\/literal}/.test(textAfter)) indent -= config.indentUnit;
      } else {
        if (/^\s*\{\/(template|deltemplate)\b/.test(textAfter)) return 0;
        if (/^\{(\/|(fallbackmsg|elseif|else|ifempty)\b)/.test(textAfter)) indent -= config.indentUnit;
        if (state.tag != "switch" && /^\{(case|default)\b/.test(textAfter)) indent -= config.indentUnit;
        if (/^\{\/switch\b/.test(textAfter)) indent -= config.indentUnit;
      }
      var localState = last(state.localStates);
      if (indent && localState.mode.indent) {
        indent += localState.mode.indent(localState.state, textAfter);
      }
      return indent;
    },

    innerMode: function(state) {
      if (state.soyState.length && last(state.soyState) != "literal") return null;
      else return last(state.localStates);
    },

    electricInput: /^\s*\{(\/|\/template|\/deltemplate|\/switch|fallbackmsg|elseif|else|case|default|ifempty|\/literal\})$/,
    lineComment: "//",
    blockCommentStart: "/*",
    blockCommentEnd: "*/",
    blockCommentContinue: " * ",
    useInnerComments: false,
    fold: "indent"
  };
}, "htmlmixed");

CodeMirror.registerHelper("hintWords", "soy", indentingTags.concat(
    ["delpackage", "namespace", "alias", "print", "css", "debugger"]));

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

});