text: var Handlebars = require("./base");
  
  // BEGIN(BROWSER)
  Handlebars.Compiler = function() {};
  Handlebars.JavaScriptCompiler = function() {};
  
  (function(Compiler, JavaScriptCompiler) {
    Compiler.OPCODE_MAP = {
      appendContent: 1,
      getContext: 2,
      lookupWithHelpers: 3,
      lookup: 4,
      append: 5,
      invokeMustache: 6,
      appendEscaped: 7,
      pushString: 8,
      truthyOrFallback: 9,
      functionOrFallback: 10,
      invokeProgram: 11,
      invokePartial: 12,
      push: 13,
      assignToHash: 15,
      pushStringParam: 16
    };
  
    Compiler.MULTI_PARAM_OPCODES = {
      appendContent: 1,
      getContext: 1,
      lookupWithHelpers: 2,
      lookup: 1,
      invokeMustache: 3,
      pushString: 1,
      truthyOrFallback: 1,
      functionOrFallback: 1,
      invokeProgram: 3,
      invokePartial: 1,
      push: 1,
      assignToHash: 1,
      pushStringParam: 1
    };
  
    Compiler.DISASSEMBLE_MAP = {};
  
    for(var prop in Compiler.OPCODE_MAP) {
      var value = Compiler.OPCODE_MAP[prop];
      Compiler.DISASSEMBLE_MAP[value] = prop;
    }
  
    Compiler.multiParamSize = function(code) {
      return Compiler.MULTI_PARAM_OPCODES[Compiler.DISASSEMBLE_MAP[code]];
    };
  
    Compiler.prototype = {
      compiler: Compiler,
  
      disassemble: function() {
        var opcodes = this.opcodes, opcode, nextCode;
        var out = [], str, name, value;
  
        for(var i=0, l=opcodes.length; i<l; i++) {
          opcode = opcodes[i];
  
          if(opcode === 'DECLARE') {
            name = opcodes[++i];
            value = opcodes[++i];
            out.push("DECLARE " + name + " = " + value);
          } else {
            str = Compiler.DISASSEMBLE_MAP[opcode];
  
            var extraParams = Compiler.multiParamSize(opcode);
            var codes = [];
  
            for(var j=0; j<extraParams; j++) {
              nextCode = opcodes[++i];
  
              if(typeof nextCode === "string") {
                nextCode = "\"" + nextCode.replace("\n", "\\n") + "\"";
              }
  
              codes.push(nextCode);
            }
  
            str = str + " " + codes.join(" ");
  
            out.push(str);
          }
        }
  
        return out.join("\n");
      },
  
      guid: 0,
  
      compile: function(program, options) {
        this.children = [];
        this.depths = {list: []};
        this.options = options;
  
        // These changes will propagate to the other compiler components
        var knownHelpers = this.options.knownHelpers;
        this.options.knownHelpers = {
          'helperMissing': true,
          'blockHelperMissing': true,
          'each': true,
          'if': true,
          'unless': true,
          'with': true,
          'log': true
        };
        if (knownHelpers) {
          for (var name in knownHelpers) {
            this.options.knownHelpers[name] = knownHelpers[name];
          }
        }
  
        return this.program(program);
      },
  
      accept: function(node) {
        return this[node.type](node);
      },
  
      program: function(program) {
        var statements = program.statements, statement;
        this.opcodes = [];
  
        for(var i=0, l=statements.length; i<l; i++) {
          statement = statements[i];
          this[statement.type](statement);
        }
        this.isSimple = l === 1;
  
        this.depths.list = this.depths.list.sort(function(a, b) {
          return a - b;
        });
  
        return this;
      },
  
      compileProgram: function(program) {
        var result = new this.compiler().compile(program, this.options);
        var guid = this.guid++;
  
        this.usePartial = this.usePartial || result.usePartial;
  
        this.children[guid] = result;
  
        for(var i=0, l=result.depths.list.length; i<l; i++) {
          depth = result.depths.list[i];
  
          if(depth < 2) { continue; }
          else { this.addDepth(depth - 1); }
        }
  
        return guid;
      },
  
      block: function(block) {
        var mustache = block.mustache;
        var depth, child, inverse, inverseGuid;
  
        var params = this.setupStackForMustache(mustache);
  
        var programGuid = this.compileProgram(block.program);
  
        if(block.program.inverse) {
          inverseGuid = this.compileProgram(block.program.inverse);
          this.declare('inverse', inverseGuid);
        }
  
        this.opcode('invokeProgram', programGuid, params.length, !!mustache.hash);
        this.declare('inverse', null);
        this.opcode('append');
      },
  
      inverse: function(block) {
        var params = this.setupStackForMustache(block.mustache);
  
        var programGuid = this.compileProgram(block.program);
  
        this.declare('inverse', programGuid);
  
        this.opcode('invokeProgram', null, params.length, !!block.mustache.hash);
        this.declare('inverse', null);
        this.opcode('append');
      },
  
      hash: function(hash) {
        var pairs = hash.pairs, pair, val;
  
        this.opcode('push', '{}');
  
        for(var i=0, l=pairs.length; i<l; i++) {
          pair = pairs[i];
          val  = pair[1];
  
          this.accept(val);
          this.opcode('assignToHash', pair[0]);
        }
      },
  
      partial: function(partial) {
        var id = partial.id;
        this.usePartial = true;
  
        if(partial.context) {
          this.ID(partial.context);
        } else {
          this.opcode('push', 'depth0');
        }
  
        this.opcode('invokePartial', id.original);
        this.opcode('append');
      },
  
      content: function(content) {
        this.opcode('appendContent', content.string);
      },
  
      mustache: function(mustache) {
        var params = this.setupStackForMustache(mustache);
  
        this.opcode('invokeMustache', params.length, mustache.id.original, !!mustache.hash);
  
        if(mustache.escaped && !this.options.noEscape) {
          this.opcode('appendEscaped');
        } else {
          this.opcode('append');
        }
      },
  
      ID: function(id) {
        this.addDepth(id.depth);
  
        this.opcode('getContext', id.depth);
  
        this.opcode('lookupWithHelpers', id.parts[0] || null, id.isScoped || false);
  
        for(var i=1, l=id.parts.length; i<l; i++) {
          this.opcode('lookup', id.parts[i]);
        }
      },
  
      STRING: function(string) {
        this.opcode('pushString', string.string);
      },
  
      INTEGER: function(integer) {
        this.opcode('push', integer.integer);
      },
  
      BOOLEAN: function(bool) {
        this.opcode('push', bool.bool);
      },
  
      comment: function() {},
  
      // HELPERS
      pushParams: function(params) {
        var i = params.length, param;
  
        while(i--) {
          param = params[i];
  
          if(this.options.stringParams) {
            if(param.depth) {
              this.addDepth(param.depth);
            }
  
            this.opcode('getContext', param.depth || 0);
            this.opcode('pushStringParam', param.string);
          } else {
            this[param.type](param);
          }
        }
      },
  
      opcode: function(name, val1, val2, val3) {
        this.opcodes.push(Compiler.OPCODE_MAP[name]);
        if(val1 !== undefined) { this.opcodes.push(val1); }
        if(val2 !== undefined) { this.opcodes.push(val2); }
        if(val3 !== undefined) { this.opcodes.push(val3); }
      },
  
      declare: function(name, value) {
        this.opcodes.push('DECLARE');
        this.opcodes.push(name);
        this.opcodes.push(value);
      },
  
      addDepth: function(depth) {
        if(depth === 0) { return; }
  
        if(!this.depths[depth]) {
          this.depths[depth] = true;
          this.depths.list.push(depth);
        }
      },
  
      setupStackForMustache: function(mustache) {
        var params = mustache.params;
  
        this.pushParams(params);
  
        if(mustache.hash) {
          this.hash(mustache.hash);
        }
  
        this.ID(mustache.id);
  
        return params;
      }
    };
  
    JavaScriptCompiler.prototype = {
      // PUBLIC API: You can override these methods in a subclass to provide
      // alternative compiled forms for name lookup and buffering semantics
      nameLookup: function(parent, name, type) {
        if (/^[0-9]+$/.test(name)) {
          return parent + "[" + name + "]";
        } else if (JavaScriptCompiler.isValidJavaScriptVariableName(name)) {
          return parent + "." + name;
        }
        else {
          return parent + "['" + name + "']";
        }
      },
  
      appendToBuffer: function(string) {
        if (this.environment.isSimple) {
          return "return " + string + ";";
        } else {
          return "buffer += " + string + ";";
        }
      },
  
      initializeBuffer: function() {
        return this.quotedString("");
      },
  
      namespace: "Handlebars",
      // END PUBLIC API
  
      compile: function(environment, options, context, asObject) {
        this.environment = environment;
        this.options = options || {};
  
        this.name = this.environment.name;
        this.isChild = !!context;
        this.context = context || {
          programs: [],
          aliases: { self: 'this' },
          registers: {list: []}
        };
  
        this.preamble();
  
        this.stackSlot = 0;
        this.stackVars = [];
  
        this.compileChildren(environment, options);
  
        var opcodes = environment.opcodes, opcode;
  
        this.i = 0;
  
        for(l=opcodes.length; this.i<l; this.i++) {
          opcode = this.nextOpcode(0);
  
          if(opcode[0] === 'DECLARE') {
            this.i = this.i + 2;
            this[opcode[1]] = opcode[2];
          } else {
            this.i = this.i + opcode[1].length;
            this[opcode[0]].apply(this, opcode[1]);
          }
        }
  
        return this.createFunctionContext(asObject);
      },
  
      nextOpcode: function(n) {
        var opcodes = this.environment.opcodes, opcode = opcodes[this.i + n], name, val;
        var extraParams, codes;
  
        if(opcode === 'DECLARE') {
          name = opcodes[this.i + 1];
          val  = opcodes[this.i + 2];
          return ['DECLARE', name, val];
        } else {
          name = Compiler.DISASSEMBLE_MAP[opcode];
  
          extraParams = Compiler.multiParamSize(opcode);
          codes = [];
  
          for(var j=0; j<extraParams; j++) {
            codes.push(opcodes[this.i + j + 1 + n]);
          }
  
          return [name, codes];
        }
      },
  
      eat: function(opcode) {
        this.i = this.i + opcode.length;
      },
  
      preamble: function() {
        var out = [];
  
        // this register will disambiguate helper lookup from finding a function in
        // a context. This is necessary for mustache compatibility, which requires
        // that context functions in blocks are evaluated by blockHelperMissing, and
        // then proceed as if the resulting value was provided to blockHelperMissing.
        this.useRegister('foundHelper');
  
        if (!this.isChild) {
          var namespace = this.namespace;
          var copies = "helpers = helpers || " + namespace + ".helpers;";
          if(this.environment.usePartial) { copies = copies + " partials = partials || " + namespace + ".partials;"; }
          out.push(copies);
        } else {
          out.push('');
        }
  
        if (!this.environment.isSimple) {
          out.push(", buffer = " + this.initializeBuffer());
        } else {
          out.push("");
        }
  
        // track the last context pushed into place to allow skipping the
        // getContext opcode when it would be a noop
        this.lastContext = 0;
        this.source = out;
      },
  
      createFunctionContext: function(asObject) {
        var locals = this.stackVars;
        if (!this.isChild) {
          locals = locals.concat(this.context.registers.list);
        }
  
        if(locals.length > 0) {
          this.source[1] = this.source[1] + ", " + locals.join(", ");
        }
  
        // Generate minimizer alias mappings
        if (!this.isChild) {
          var aliases = [];
          for (var alias in this.context.aliases) {
            this.source[1] = this.source[1] + ', ' + alias + '=' + this.context.aliases[alias];
          }
        }
  
        if (this.source[1]) {
          this.source[1] = "var " + this.source[1].substring(2) + ";";
        }
  
        // Merge children
        if (!this.isChild) {
          this.source[1] += '\n' + this.context.programs.join('\n') + '\n';
        }
  
        if (!this.environment.isSimple) {
          this.source.push("return buffer;");
        }
  
        var params = this.isChild ? ["depth0", "data"] : ["Handlebars", "depth0", "helpers", "partials", "data"];
  
        for(var i=0, l=this.environment.depths.list.length; i<l; i++) {
          params.push("depth" + this.environment.depths.list[i]);
        }
  
        if (asObject) {
          params.push(this.source.join("\n  "));
  
          return Function.apply(this, params);
        } else {
          var functionSource = 'function ' + (this.name || '') + '(' + params.join(',') + ') {\n  ' + this.source.join("\n  ") + '}';
          Handlebars.log(Handlebars.logger.DEBUG, functionSource + "\n\n");
          return functionSource;
        }
      },
  
      appendContent: function(content) {
        this.source.push(this.appendToBuffer(this.quotedString(content)));
      },
  
      append: function() {
        var local = this.popStack();
        this.source.push("if(" + local + " || " + local + " === 0) { " + this.appendToBuffer(local) + " }");
        if (this.environment.isSimple) {
          this.source.push("else { " + this.appendToBuffer("''") + " }");
        }
      },
  
      appendEscaped: function() {
        var opcode = this.nextOpcode(1), extra = "";
        this.context.aliases.escapeExpression = 'this.escapeExpression';
  
        if(opcode[0] === 'appendContent') {
          extra = " + " + this.quotedString(opcode[1][0]);
          this.eat(opcode);
        }
  
        this.source.push(this.appendToBuffer("escapeExpression(" + this.popStack() + ")" + extra));
      },
  
      getContext: function(depth) {
        if(this.lastContext !== depth) {
          this.lastContext = depth;
        }
      },
  
      lookupWithHelpers: function(name, isScoped) {
        if(name) {
          var topStack = this.nextStack();
  
          this.usingKnownHelper = false;
  
          var toPush;
          if (!isScoped && this.options.knownHelpers[name]) {
            toPush = topStack + " = " + this.nameLookup('helpers', name, 'helper');
            this.usingKnownHelper = true;
          } else if (isScoped || this.options.knownHelpersOnly) {
            toPush = topStack + " = " + this.nameLookup('depth' + this.lastContext, name, 'context');
          } else {
            this.register('foundHelper', this.nameLookup('helpers', name, 'helper'));
            toPush = topStack + " = foundHelper || " + this.nameLookup('depth' + this.lastContext, name, 'context');
          }
  
          toPush += ';';
          this.source.push(toPush);
        } else {
          this.pushStack('depth' + this.lastContext);
        }
      },
  
      lookup: function(name) {
        var topStack = this.topStack();
        this.source.push(topStack + " = (" + topStack + " === null || " + topStack + " === undefined || " + topStack + " === false ? " +
           topStack + " : " + this.nameLookup(topStack, name, 'context') + ");");
      },
  
      pushStringParam: function(string) {
        this.pushStack('depth' + this.lastContext);
        this.pushString(string);
      },
  
      pushString: function(string) {
        this.pushStack(this.quotedString(string));
      },
  
      push: function(name) {
        this.pushStack(name);
      },
  
      invokeMustache: function(paramSize, original, hasHash) {
        this.populateParams(paramSize, this.quotedString(original), "{}", null, hasHash, function(nextStack, helperMissingString, id) {
          if (!this.usingKnownHelper) {
            this.context.aliases.helperMissing = 'helpers.helperMissing';
            this.context.aliases.undef = 'void 0';
            this.source.push("else if(" + id + "=== undef) { " + nextStack + " = helperMissing.call(" + helperMissingString + "); }");
            if (nextStack !== id) {
              this.source.push("else { " + nextStack + " = " + id + "; }");
            }
          }
        });
      },
  
      invokeProgram: function(guid, paramSize, hasHash) {
        var inverse = this.programExpression(this.inverse);
        var mainProgram = this.programExpression(guid);
  
        this.populateParams(paramSize, null, mainProgram, inverse, hasHash, function(nextStack, helperMissingString, id) {
          if (!this.usingKnownHelper) {
            this.context.aliases.blockHelperMissing = 'helpers.blockHelperMissing';
            this.source.push("else { " + nextStack + " = blockHelperMissing.call(" + helperMissingString + "); }");
          }
        });
      },
  
      populateParams: function(paramSize, helperId, program, inverse, hasHash, fn) {
        var needsRegister = hasHash || this.options.stringParams || inverse || this.options.data;
        var id = this.popStack(), nextStack;
        var params = [], param, stringParam, stringOptions;
  
        if (needsRegister) {
          this.register('tmp1', program);
          stringOptions = 'tmp1';
        } else {
          stringOptions = '{ hash: {} }';
        }
  
        if (needsRegister) {
          var hash = (hasHash ? this.popStack() : '{}');
          this.source.push('tmp1.hash = ' + hash + ';');
        }
  
        if(this.options.stringParams) {
          this.source.push('tmp1.contexts = [];');
        }
  
        for(var i=0; i<paramSize; i++) {
          param = this.popStack();
          params.push(param);
  
          if(this.options.stringParams) {
            this.source.push('tmp1.contexts.push(' + this.popStack() + ');');
          }
        }
  
        if(inverse) {
          this.source.push('tmp1.fn = tmp1;');
          this.source.push('tmp1.inverse = ' + inverse + ';');
        }
  
        if(this.options.data) {
          this.source.push('tmp1.data = data;');
        }
  
        params.push(stringOptions);
  
        this.populateCall(params, id, helperId || id, fn, program !== '{}');
      },
  
      populateCall: function(params, id, helperId, fn, program) {
        var paramString = ["depth0"].concat(params).join(", ");
        var helperMissingString = ["depth0"].concat(helperId).concat(params).join(", ");
  
        var nextStack = this.nextStack();
  
        if (this.usingKnownHelper) {
          this.source.push(nextStack + " = " + id + ".call(" + paramString + ");");
        } else {
          this.context.aliases.functionType = '"function"';
          var condition = program ? "foundHelper && " : "";
          this.source.push("if(" + condition + "typeof " + id + " === functionType) { " + nextStack + " = " + id + ".call(" + paramString + "); }");
        }
        fn.call(this, nextStack, helperMissingString, id);
        this.usingKnownHelper = false;
      },
  
      invokePartial: function(context) {
        params = [this.nameLookup('partials', context, 'partial'), "'" + context + "'", this.popStack(), "helpers", "partials"];
  
        if (this.options.data) {
          params.push("data");
        }
  
        this.pushStack("self.invokePartial(" + params.join(", ") + ");");
      },
  
      assignToHash: function(key) {
        var value = this.popStack();
        var hash = this.topStack();
  
        this.source.push(hash + "['" + key + "'] = " + value + ";");
      },
  
      // HELPERS
  
      compiler: JavaScriptCompiler,
  
      compileChildren: function(environment, options) {
        var children = environment.children, child, compiler;
  
        for(var i=0, l=children.length; i<l; i++) {
          child = children[i];
          compiler = new this.compiler();
  
          this.context.programs.push('');     // Placeholder to prevent name conflicts for nested children
          var index = this.context.programs.length;
          child.index = index;
          child.name = 'program' + index;
          this.context.programs[index] = compiler.compile(child, options, this.context);
        }
      },
  
      programExpression: function(guid) {
        if(guid == null) { return "self.noop"; }
  
        var child = this.environment.children[guid],
            depths = child.depths.list;
        var programParams = [child.index, child.name, "data"];
  
        for(var i=0, l = depths.length; i<l; i++) {
          depth = depths[i];
  
          if(depth === 1) { programParams.push("depth0"); }
          else { programParams.push("depth" + (depth - 1)); }
        }
  
        if(depths.length === 0) {
          return "self.program(" + programParams.join(", ") + ")";
        } else {
          programParams.shift();
          return "self.programWithDepth(" + programParams.join(", ") + ")";
        }
      },
  
      register: function(name, val) {
        this.useRegister(name);
        this.source.push(name + " = " + val + ";");
      },
  
      useRegister: function(name) {
        if(!this.context.registers[name]) {
          this.context.registers[name] = true;
          this.context.registers.list.push(name);
        }
      },
  
      pushStack: function(item) {
        this.source.push(this.nextStack() + " = " + item + ";");
        return "stack" + this.stackSlot;
      },
  
      nextStack: function() {
        this.stackSlot++;
        if(this.stackSlot > this.stackVars.length) { this.stackVars.push("stack" + this.stackSlot); }
        return "stack" + this.stackSlot;
      },
  
      popStack: function() {
        return "stack" + this.stackSlot--;
      },
  
      topStack: function() {
        return "stack" + this.stackSlot;
      },
  
      quotedString: function(str) {
        return '"' + str
          .replace(/\\/g, '\\\\')
          .replace(/"/g, '\\"')
          .replace(/\n/g, '\\n')
          .replace(/\r/g, '\\r') + '"';
      }
    };
  
    var reservedWords = (
      "break else new var" +
      " case finally return void" +
      " catch for switch while" +
      " continue function this with" +
      " default if throw" +
      " delete in try" +
      " do instanceof typeof" +
      " abstract enum int short" +
      " boolean export interface static" +
      " byte extends long super" +
      " char final native synchronized" +
      " class float package throws" +
      " const goto private transient" +
      " debugger implements protected volatile" +
      " double import public let yield"
    ).split(" ");
  
    var compilerWords = JavaScriptCompiler.RESERVED_WORDS = {};
  
    for(var i=0, l=reservedWords.length; i<l; i++) {
      compilerWords[reservedWords[i]] = true;
    }
  
    JavaScriptCompiler.isValidJavaScriptVariableName = function(name) {
      if(!JavaScriptCompiler.RESERVED_WORDS[name] && /^[a-zA-Z_$][0-9a-zA-Z_$]+$/.test(name)) {
        return true;
      }
      return false;
    };
  
  })(Handlebars.Compiler, Handlebars.JavaScriptCompiler);
  
  Handlebars.precompile = function(string, options) {
    options = options || {};
  
    var ast = Handlebars.parse(string);
    var environment = new Handlebars.Compiler().compile(ast, options);
    return new Handlebars.JavaScriptCompiler().compile(environment, options);
  };
  
  Handlebars.compile = function(string, options) {
    options = options || {};
  
    var compiled;
    function compile() {
      var ast = Handlebars.parse(string);
      var environment = new Handlebars.Compiler().compile(ast, options);
      var templateSpec = new Handlebars.JavaScriptCompiler().compile(environment, options, undefined, true);
      return Handlebars.template(templateSpec);
    }
  
    // Template is only compiled on first use and cached after that point.
    return function(context, options) {
      if (!compiled) {
        compiled = compile();
      }
      return compiled.call(this, context, options);
    };
  };
  
  // END(BROWSER)
  
  