liquid-node/lib/liquid/block.js

Node.js port of Tobias Lütke's Liquid template engine.

// Generated by CoffeeScript 1.10.0
(function() {
  var Block, Liquid, Promise_each, util,
    extend = function(child, parent) { for (var key in parent) { if (hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; },
    hasProp = {}.hasOwnProperty;

  Liquid = require("../liquid");

  util = require("util");

  Promise_each = function(promises, cb) {
    var iterator;
    iterator = function(index) {
      var promise;
      if (index >= promises.length) {
        return Promise.resolve();
      }
      promise = promises[index];
      return Promise.resolve(promise).then(function(value) {
        return Promise.resolve(cb(value)).then(function() {
          return iterator(index + 1);
        });
      });
    };
    return iterator(0);
  };

  module.exports = Block = (function(superClass) {
    extend(Block, superClass);

    function Block() {
      return Block.__super__.constructor.apply(this, arguments);
    }

    Block.IsTag = RegExp("^" + Liquid.TagStart.source);

    Block.IsVariable = RegExp("^" + Liquid.VariableStart.source);

    Block.FullToken = RegExp("^" + Liquid.TagStart.source + "\\s*(\\w+)\\s*(.*)?" + Liquid.TagEnd.source + "$");

    Block.ContentOfVariable = RegExp("^" + Liquid.VariableStart.source + "(.*)" + Liquid.VariableEnd.source + "$");

    Block.prototype.beforeParse = function() {
      if (this.nodelist == null) {
        this.nodelist = [];
      }
      return this.nodelist.length = 0;
    };

    Block.prototype.afterParse = function() {
      return this.assertMissingDelimitation();
    };

    Block.prototype.parse = function(tokens) {
      var token;
      if (tokens.length === 0 || this.ended) {
        return Promise.resolve();
      }
      token = tokens.shift();
      return Promise.resolve().then((function(_this) {
        return function() {
          return _this.parseToken(token, tokens);
        };
      })(this))["catch"](function(e) {
        e.message = e.message + "\n    at " + token.value + " (" + token.filename + ":" + token.line + ":" + token.col + ")";
        if (e.location == null) {
          e.location = {
            col: token.col,
            line: token.line,
            filename: token.filename
          };
        }
        throw e;
      }).then((function(_this) {
        return function() {
          return _this.parse(tokens);
        };
      })(this));
    };

    Block.prototype.parseToken = function(token, tokens) {
      var Tag, match, tag;
      if (Block.IsTag.test(token.value)) {
        match = Block.FullToken.exec(token.value);
        if (!match) {
          throw new Liquid.SyntaxError("Tag '" + token.value + "' was not properly terminated with regexp: " + Liquid.TagEnd.inspect);
        }
        if (this.blockDelimiter() === match[1]) {
          return this.endTag();
        }
        Tag = this.template.tags[match[1]];
        if (!Tag) {
          return this.unknownTag(match[1], match[2], tokens);
        }
        tag = new Tag(this.template, match[1], match[2]);
        this.nodelist.push(tag);
        return tag.parseWithCallbacks(tokens);
      } else if (Block.IsVariable.test(token.value)) {
        return this.nodelist.push(this.createVariable(token));
      } else if (token.value.length === 0) {

      } else {
        return this.nodelist.push(token.value);
      }
    };

    Block.prototype.endTag = function() {
      return this.ended = true;
    };

    Block.prototype.unknownTag = function(tag, params, tokens) {
      if (tag === 'else') {
        throw new Liquid.SyntaxError((this.blockName()) + " tag does not expect else tag");
      } else if (tag === 'end') {
        throw new Liquid.SyntaxError("'end' is not a valid delimiter for " + (this.blockName()) + " tags. use " + (this.blockDelimiter()));
      } else {
        throw new Liquid.SyntaxError("Unknown tag '" + tag + "'");
      }
    };

    Block.prototype.blockDelimiter = function() {
      return "end" + (this.blockName());
    };

    Block.prototype.blockName = function() {
      return this.tagName;
    };

    Block.prototype.createVariable = function(token) {
      var match, ref;
      match = (ref = Liquid.Block.ContentOfVariable.exec(token.value)) != null ? ref[1] : void 0;
      if (match) {
        return new Liquid.Variable(match);
      }
      throw new Liquid.SyntaxError("Variable '" + token.value + "' was not properly terminated with regexp: " + Liquid.VariableEnd.inspect);
    };

    Block.prototype.render = function(context) {
      return this.renderAll(this.nodelist, context);
    };

    Block.prototype.assertMissingDelimitation = function() {
      if (!this.ended) {
        throw new Liquid.SyntaxError((this.blockName()) + " tag was never closed");
      }
    };

    Block.prototype.renderAll = function(list, context) {
      var accumulator;
      accumulator = [];
      return Promise_each(list, function(token) {
        if (typeof (token != null ? token.render : void 0) !== "function") {
          accumulator.push(token);
          return;
        }
        return Promise.resolve().then(function() {
          return token.render(context);
        }).then(function(s) {
          return accumulator.push(s);
        }, function(e) {
          return accumulator.push(context.handleError(e));
        });
      }).then(function() {
        return accumulator;
      });
    };

    return Block;

  })(Liquid.Tag);

}).call(this);

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