define(['exports', '../exception'], function (exports, _exception) {
  'use strict';

  exports.__esModule = true;
  exports.SourceLocation = SourceLocation;
  exports.id = id;
  exports.stripFlags = stripFlags;
  exports.stripComment = stripComment;
  exports.preparePath = preparePath;
  exports.prepareMustache = prepareMustache;
  exports.prepareRawBlock = prepareRawBlock;
  exports.prepareBlock = prepareBlock;
  exports.prepareProgram = prepareProgram;
  exports.preparePartialBlock = preparePartialBlock;
  // istanbul ignore next

  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }

  var _Exception = _interopRequireDefault(_exception);

  function validateClose(open, close) {
    close = close.path ? close.path.original : close;

    if (open.path.original !== close) {
      var errorNode = { loc: open.path.loc };

      throw new _Exception['default'](open.path.original + " doesn't match " + close, errorNode);
    }
  }

  function SourceLocation(source, locInfo) {
    this.source = source;
    this.start = {
      line: locInfo.first_line,
      column: locInfo.first_column
    };
    this.end = {
      line: locInfo.last_line,
      column: locInfo.last_column
    };
  }

  function id(token) {
    if (/^\[.*\]$/.test(token)) {
      return token.substring(1, token.length - 1);
    } else {
      return token;
    }
  }

  function stripFlags(open, close) {
    return {
      open: open.charAt(2) === '~',
      close: close.charAt(close.length - 3) === '~'
    };
  }

  function stripComment(comment) {
    return comment.replace(/^\{\{~?!-?-?/, '').replace(/-?-?~?\}\}$/, '');
  }

  function preparePath(data, parts, loc) {
    loc = this.locInfo(loc);

    var original = data ? '@' : '',
        dig = [],
        depth = 0;

    for (var i = 0, l = parts.length; i < l; i++) {
      var part = parts[i].part,

      // If we have [] syntax then we do not treat path references as operators,
      // i.e. foo.[this] resolves to approximately context.foo['this']
      isLiteral = parts[i].original !== part;
      original += (parts[i].separator || '') + part;

      if (!isLiteral && (part === '..' || part === '.' || part === 'this')) {
        if (dig.length > 0) {
          throw new _Exception['default']('Invalid path: ' + original, { loc: loc });
        } else if (part === '..') {
          depth++;
        }
      } else {
        dig.push(part);
      }
    }

    return {
      type: 'PathExpression',
      data: data,
      depth: depth,
      parts: dig,
      original: original,
      loc: loc
    };
  }

  function prepareMustache(path, params, hash, open, strip, locInfo) {
    // Must use charAt to support IE pre-10
    var escapeFlag = open.charAt(3) || open.charAt(2),
        escaped = escapeFlag !== '{' && escapeFlag !== '&';

    var decorator = /\*/.test(open);
    return {
      type: decorator ? 'Decorator' : 'MustacheStatement',
      path: path,
      params: params,
      hash: hash,
      escaped: escaped,
      strip: strip,
      loc: this.locInfo(locInfo)
    };
  }

  function prepareRawBlock(openRawBlock, contents, close, locInfo) {
    validateClose(openRawBlock, close);

    locInfo = this.locInfo(locInfo);
    var program = {
      type: 'Program',
      body: contents,
      strip: {},
      loc: locInfo
    };

    return {
      type: 'BlockStatement',
      path: openRawBlock.path,
      params: openRawBlock.params,
      hash: openRawBlock.hash,
      program: program,
      openStrip: {},
      inverseStrip: {},
      closeStrip: {},
      loc: locInfo
    };
  }

  function prepareBlock(openBlock, program, inverseAndProgram, close, inverted, locInfo) {
    if (close && close.path) {
      validateClose(openBlock, close);
    }

    var decorator = /\*/.test(openBlock.open);

    program.blockParams = openBlock.blockParams;

    var inverse = undefined,
        inverseStrip = undefined;

    if (inverseAndProgram) {
      if (decorator) {
        throw new _Exception['default']('Unexpected inverse block on decorator', inverseAndProgram);
      }

      if (inverseAndProgram.chain) {
        inverseAndProgram.program.body[0].closeStrip = close.strip;
      }

      inverseStrip = inverseAndProgram.strip;
      inverse = inverseAndProgram.program;
    }

    if (inverted) {
      inverted = inverse;
      inverse = program;
      program = inverted;
    }

    return {
      type: decorator ? 'DecoratorBlock' : 'BlockStatement',
      path: openBlock.path,
      params: openBlock.params,
      hash: openBlock.hash,
      program: program,
      inverse: inverse,
      openStrip: openBlock.strip,
      inverseStrip: inverseStrip,
      closeStrip: close && close.strip,
      loc: this.locInfo(locInfo)
    };
  }

  function prepareProgram(statements, loc) {
    if (!loc && statements.length) {
      var firstLoc = statements[0].loc,
          lastLoc = statements[statements.length - 1].loc;

      /* istanbul ignore else */
      if (firstLoc && lastLoc) {
        loc = {
          source: firstLoc.source,
          start: {
            line: firstLoc.start.line,
            column: firstLoc.start.column
          },
          end: {
            line: lastLoc.end.line,
            column: lastLoc.end.column
          }
        };
      }
    }

    return {
      type: 'Program',
      body: statements,
      strip: {},
      loc: loc
    };
  }

  function preparePartialBlock(open, program, close, locInfo) {
    validateClose(open, close);

    return {
      type: 'PartialBlockStatement',
      name: open.path,
      params: open.params,
      hash: open.hash,
      program: program,
      openStrip: open.strip,
      closeStrip: close && close.strip,
      loc: this.locInfo(locInfo)
    };
  }
});
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