handlebars
Version:
Handlebars provides the power necessary to let you build semantic templates effectively with no frustration
710 lines • 74 kB
JavaScript
/* eslint-disable new-cap */
'use strict';
exports.__esModule = true;
exports.Compiler = Compiler;
exports.precompile = precompile;
exports.compile = compile;
// istanbul ignore next
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }
var _exception = require('../exception');
var _exception2 = _interopRequireDefault(_exception);
var _utils = require('../utils');
var _ast = require('./ast');
var _ast2 = _interopRequireDefault(_ast);
var _nodeTypes = require('./node-types');
var slice = [].slice;
function Compiler() {}
// the foundHelper 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.
Compiler.prototype = {
compiler: Compiler,
equals: function equals(other) {
var len = this.opcodes.length;
if (other.opcodes.length !== len) {
return false;
}
for (var i = 0; i < len; i++) {
var opcode = this.opcodes[i],
otherOpcode = other.opcodes[i];
if (opcode.opcode !== otherOpcode.opcode || !argEquals(opcode.args, otherOpcode.args)) {
return false;
}
}
// We know that length is the same between the two arrays because they are directly tied
// to the opcode behavior above.
len = this.children.length;
for (var i = 0; i < len; i++) {
if (!this.children[i].equals(other.children[i])) {
return false;
}
}
return true;
},
guid: 0,
compile: function compile(program, options) {
this.sourceNode = [];
this.opcodes = [];
this.children = [];
this.options = options;
this.stringParams = options.stringParams;
this.trackIds = options.trackIds;
options.blockParams = options.blockParams || [];
options.knownHelpers = _utils.extend(Object.create(null), {
helperMissing: true,
blockHelperMissing: true,
each: true,
'if': true,
unless: true,
'with': true,
log: true,
lookup: true
}, options.knownHelpers);
return this.accept(program);
},
compileProgram: function compileProgram(program) {
var childCompiler = new this.compiler(),
// eslint-disable-line new-cap
result = childCompiler.compile(program, this.options),
guid = this.guid++;
this.usePartial = this.usePartial || result.usePartial;
this.children[guid] = result;
this.useDepths = this.useDepths || result.useDepths;
return guid;
},
accept: function accept(node) {
// Dispatching on an unknown type could call an arbitrary Compiler method.
if (_utils.indexOf(_nodeTypes.NODE_TYPES, node.type) === -1 || !this[node.type]) {
throw new _exception2['default']('Unknown type: ' + node.type, node);
}
this.sourceNode.unshift(node);
var ret = this[node.type](node);
this.sourceNode.shift();
return ret;
},
Program: function Program(program) {
validateBlockParams(program);
this.options.blockParams.unshift(program.blockParams);
var body = program.body,
bodyLength = body.length;
for (var i = 0; i < bodyLength; i++) {
this.accept(body[i]);
}
this.options.blockParams.shift();
this.isSimple = bodyLength === 1;
this.blockParams = program.blockParams ? program.blockParams.length : 0;
return this;
},
BlockStatement: function BlockStatement(block) {
transformLiteralToPath(block);
var program = block.program,
inverse = block.inverse;
program = program && this.compileProgram(program);
inverse = inverse && this.compileProgram(inverse);
var type = this.classifySexpr(block);
if (type === 'helper') {
this.helperSexpr(block, program, inverse);
} else if (type === 'simple') {
this.simpleSexpr(block);
// now that the simple mustache is resolved, we need to
// evaluate it by executing `blockHelperMissing`
this.opcode('pushProgram', program);
this.opcode('pushProgram', inverse);
this.opcode('emptyHash');
this.opcode('blockValue', block.path.original);
} else {
this.ambiguousSexpr(block, program, inverse);
// now that the simple mustache is resolved, we need to
// evaluate it by executing `blockHelperMissing`
this.opcode('pushProgram', program);
this.opcode('pushProgram', inverse);
this.opcode('emptyHash');
this.opcode('ambiguousBlockValue');
}
this.opcode('append');
},
DecoratorBlock: function DecoratorBlock(decorator) {
var program = decorator.program && this.compileProgram(decorator.program);
var params = this.setupFullMustacheParams(decorator, program, undefined),
path = decorator.path;
this.useDecorators = true;
this.opcode('registerDecorator', params.length, path.original);
},
PartialStatement: function PartialStatement(partial) {
this.usePartial = true;
var program = partial.program;
if (program) {
program = this.compileProgram(partial.program);
}
var params = partial.params;
if (params.length > 1) {
throw new _exception2['default']('Unsupported number of partial arguments: ' + params.length, partial);
} else if (!params.length) {
if (this.options.explicitPartialContext) {
this.opcode('pushLiteral', 'undefined');
} else {
params.push({ type: 'PathExpression', parts: [], depth: 0 });
}
}
var partialName = partial.name.original,
isDynamic = partial.name.type === 'SubExpression';
if (isDynamic) {
this.accept(partial.name);
}
this.setupFullMustacheParams(partial, program, undefined, true);
var indent = partial.indent || '';
if (this.options.preventIndent && indent) {
this.opcode('appendContent', indent);
indent = '';
}
this.opcode('invokePartial', isDynamic, partialName, indent);
this.opcode('append');
},
PartialBlockStatement: function PartialBlockStatement(partialBlock) {
this.PartialStatement(partialBlock);
},
MustacheStatement: function MustacheStatement(mustache) {
this.SubExpression(mustache);
if (mustache.escaped && !this.options.noEscape) {
this.opcode('appendEscaped');
} else {
this.opcode('append');
}
},
Decorator: function Decorator(decorator) {
this.DecoratorBlock(decorator);
},
ContentStatement: function ContentStatement(content) {
if (content.value != null && typeof content.value !== 'string') {
throw invalidAst(content, 'value must be a string');
}
if (content.value) {
this.opcode('appendContent', content.value);
}
},
CommentStatement: function CommentStatement() {},
SubExpression: function SubExpression(sexpr) {
transformLiteralToPath(sexpr);
var type = this.classifySexpr(sexpr);
if (type === 'simple') {
this.simpleSexpr(sexpr);
} else if (type === 'helper') {
this.helperSexpr(sexpr);
} else {
this.ambiguousSexpr(sexpr);
}
},
ambiguousSexpr: function ambiguousSexpr(sexpr, program, inverse) {
var path = sexpr.path,
name = path.parts[0],
isBlock = program != null || inverse != null;
this.opcode('getContext', validateDepth(path));
this.opcode('pushProgram', program);
this.opcode('pushProgram', inverse);
path.strict = true;
this.accept(path);
this.opcode('invokeAmbiguous', name, isBlock);
},
simpleSexpr: function simpleSexpr(sexpr) {
var path = sexpr.path;
path.strict = true;
this.accept(path);
this.opcode('resolvePossibleLambda');
},
helperSexpr: function helperSexpr(sexpr, program, inverse) {
var params = this.setupFullMustacheParams(sexpr, program, inverse),
path = sexpr.path,
name = path.parts[0];
if (this.options.knownHelpers[name]) {
this.opcode('invokeKnownHelper', params.length, name);
} else if (this.options.knownHelpersOnly) {
throw new _exception2['default']('You specified knownHelpersOnly, but used the unknown helper ' + name, sexpr);
} else {
path.strict = true;
path.falsy = true;
this.accept(path);
this.opcode('invokeHelper', params.length, path.original, _ast2['default'].helpers.simpleId(path));
}
},
PathExpression: function PathExpression(path) {
// Validate AST values at the compiler boundary: javascript-compiler.js
// trusts all opcode arguments to be safe.
var depth = validateDepth(path);
var parts = validateParts(path);
this.addDepth(depth);
this.opcode('getContext', depth);
var name = parts[0],
scoped = _ast2['default'].helpers.scopedId(path),
blockParamId = !depth && !scoped && this.blockParamIndex(name);
if (blockParamId) {
this.opcode('lookupBlockParam', blockParamId, parts);
} else if (!name) {
// Context reference, i.e. `{{foo .}}` or `{{foo ..}}`
this.opcode('pushContext');
} else if (path.data) {
this.options.data = true;
this.opcode('lookupData', depth, parts, path.strict);
} else {
this.opcode('lookupOnContext', parts, path.falsy, path.strict, scoped);
}
},
StringLiteral: function StringLiteral(string) {
validateLiteral(string);
this.opcode('pushString', string.value);
},
NumberLiteral: function NumberLiteral(number) {
validateLiteral(number);
this.opcode('pushLiteral', number.value);
},
BooleanLiteral: function BooleanLiteral(bool) {
validateLiteral(bool);
this.opcode('pushLiteral', bool.value);
},
UndefinedLiteral: function UndefinedLiteral() {
this.opcode('pushLiteral', 'undefined');
},
NullLiteral: function NullLiteral() {
this.opcode('pushLiteral', 'null');
},
Hash: function Hash(hash) {
var pairs = hash.pairs,
i = 0,
l = undefined;
if (!_utils.isArray(pairs)) {
throw invalidAst(hash, 'pairs must be an array');
}
l = pairs.length;
for (var j = 0; j < l; j++) {
if (!pairs[j] || typeof pairs[j].key !== 'string') {
throw invalidAst(hash, 'pair keys must be strings');
}
}
this.opcode('pushHash');
for (; i < l; i++) {
this.pushParam(pairs[i].value);
}
while (i--) {
this.opcode('assignToHash', pairs[i].key);
}
this.opcode('popHash');
},
// HELPERS
opcode: function opcode(name) {
this.opcodes.push({
opcode: name,
args: slice.call(arguments, 1),
loc: this.sourceNode[0].loc
});
},
addDepth: function addDepth(depth) {
if (!depth) {
return;
}
this.useDepths = true;
},
classifySexpr: function classifySexpr(sexpr) {
// The first part is used as a helper name below, e.g. for known helpers,
// before the PathExpression handler gets to validate the parts.
validateParts(sexpr.path);
var isSimple = _ast2['default'].helpers.simpleId(sexpr.path);
var isBlockParam = isSimple && !!this.blockParamIndex(sexpr.path.parts[0]);
// a mustache is an eligible helper if:
// * its id is simple (a single part, not `this` or `..`)
var isHelper = !isBlockParam && _ast2['default'].helpers.helperExpression(sexpr);
// if a mustache is an eligible helper but not a definite
// helper, it is ambiguous, and will be resolved in a later
// pass or at runtime.
var isEligible = !isBlockParam && (isHelper || isSimple);
// if ambiguous, we can possibly resolve the ambiguity now
// An eligible helper is one that does not have a complex path, i.e. `this.foo`, `../foo` etc.
if (isEligible && !isHelper) {
var _name = sexpr.path.parts[0],
options = this.options;
if (options.knownHelpers[_name]) {
isHelper = true;
} else if (options.knownHelpersOnly) {
isEligible = false;
}
}
if (isHelper) {
return 'helper';
} else if (isEligible) {
return 'ambiguous';
} else {
return 'simple';
}
},
pushParams: function pushParams(params) {
for (var i = 0, l = params.length; i < l; i++) {
this.pushParam(params[i]);
}
},
pushParam: function pushParam(val) {
// Literal params are not visited by their node handlers in stringParams
// mode, so their values must be validated here as well.
validateLiteral(val);
var value = val.value != null ? val.value : val.original || '';
var depth = validateDepth(val);
if (this.stringParams) {
// pushStringParam emits non-string values as raw JavaScript literals.
// Literal values are validated above, but `original` is not, so
// anything that is not a number or boolean is stringified.
if (typeof value !== 'number' && typeof value !== 'boolean') {
value = String(value);
}
if (value.replace) {
value = value.replace(/^(\.?\.\/)*/g, '').replace(/\//g, '.');
}
if (depth) {
this.addDepth(depth);
}
this.opcode('getContext', depth);
this.opcode('pushStringParam', value, val.type);
if (val.type === 'SubExpression') {
// SubExpressions get evaluated and passed in
// in string params mode.
this.accept(val);
}
} else {
if (this.trackIds) {
var blockParamIndex = undefined;
if (val.parts && !_ast2['default'].helpers.scopedId(val) && !depth) {
// The parts are read here before the PathExpression handler,
// invoked by accept() below, gets to validate them.
blockParamIndex = this.blockParamIndex(validateParts(val)[0]);
}
if (blockParamIndex) {
var blockParamChild = val.parts.slice(1).join('.');
this.opcode('pushId', 'BlockParam', blockParamIndex, blockParamChild);
} else {
value = val.original || value;
if (value.replace) {
value = value.replace(/^this(?:\.|$)/, '').replace(/^\.\//, '').replace(/^\.$/, '');
}
this.opcode('pushId', val.type, value);
}
}
this.accept(val);
}
},
setupFullMustacheParams: function setupFullMustacheParams(sexpr, program, inverse, omitEmpty) {
var params = sexpr.params;
this.pushParams(params);
this.opcode('pushProgram', program);
this.opcode('pushProgram', inverse);
if (sexpr.hash) {
this.accept(sexpr.hash);
} else {
this.opcode('emptyHash', omitEmpty);
}
return params;
},
blockParamIndex: function blockParamIndex(name) {
for (var depth = 0, len = this.options.blockParams.length; depth < len; depth++) {
var blockParams = this.options.blockParams[depth],
param = blockParams && _utils.indexOf(blockParams, name);
if (blockParams && param >= 0) {
return [depth, param];
}
}
}
};
function precompile(input, options, env) {
if (input == null || typeof input !== 'string' && input.type !== 'Program') {
throw new _exception2['default']('You must pass a string or Handlebars AST to Handlebars.precompile. You passed ' + input);
}
options = options || {};
if (!('data' in options)) {
options.data = true;
}
if (options.compat) {
options.useDepths = true;
}
var ast = env.parse(input, options),
environment = new env.Compiler().compile(ast, options);
return new env.JavaScriptCompiler().compile(environment, options);
}
function compile(input, options, env) {
if (options === undefined) options = {};
if (input == null || typeof input !== 'string' && input.type !== 'Program') {
throw new _exception2['default']('You must pass a string or Handlebars AST to Handlebars.compile. You passed ' + input);
}
options = _utils.extend({}, options);
if (!('data' in options)) {
options.data = true;
}
if (options.compat) {
options.useDepths = true;
}
var compiled = undefined;
function compileInput() {
var ast = env.parse(input, options),
environment = new env.Compiler().compile(ast, options),
templateSpec = new env.JavaScriptCompiler().compile(environment, options, undefined, true);
return env.template(templateSpec);
}
// Template is only compiled on first use and cached after that point.
function ret(context, execOptions) {
if (!compiled) {
compiled = compileInput();
}
return compiled.call(this, context, execOptions);
}
ret._setup = function (setupOptions) {
if (!compiled) {
compiled = compileInput();
}
return compiled._setup(setupOptions);
};
ret._child = function (i, data, blockParams, depths) {
if (!compiled) {
compiled = compileInput();
}
return compiled._child(i, data, blockParams, depths);
};
return ret;
}
/**
* Create the exception thrown for an AST node that fails validation.
*
* @param {Object} node the offending AST node; its `type` is included in the
* message and its `loc`, if present, in the error location
* @param {string} message what is wrong with the node
* @returns {Exception} the exception to throw
*/
function invalidAst(node, message) {
return new _exception2['default']('Invalid AST: ' + node.type + ' ' + message, node);
}
/**
* Validate the `depth` of a path or param node.
*
* A missing depth is treated as 0, because ASTs built by hand or by other
* tools commonly omit it. Any depth that is present must be a non-negative
* integer, since it is written into the generated code.
*
* @param {Object} node the AST node whose `depth` is validated
* @returns {number} the validated depth, or 0 if the node has none
* @throws {Exception} if the depth is present but not a non-negative integer
*/
function validateDepth(node) {
var depth = node.depth;
if (depth == null) {
return 0;
}
if (typeof depth !== 'number' || !isFinite(depth) || Math.floor(depth) !== depth || depth < 0) {
throw invalidAst(node, 'depth must be a non-negative integer');
}
return depth;
}
/**
* Validate the `value` of a StringLiteral, NumberLiteral or BooleanLiteral.
*
* Literal values are written into the generated code, so they must have
* exactly the type their node promises. Nodes of any other type pass through
* unchanged.
*
* Numbers need not be finite: the parser produces Infinity for very long
* number literals, and Infinity and NaN are emitted as the read-only globals
* of the same name.
*
* @param {Object} node the AST node to validate
* @throws {Exception} if the value does not match the literal type
*/
function validateLiteral(node) {
var value = node.value;
if (node.type === 'StringLiteral' && typeof value !== 'string') {
throw invalidAst(node, 'value must be a string');
} else if (node.type === 'NumberLiteral' && typeof value !== 'number') {
throw invalidAst(node, 'value must be a number');
} else if (node.type === 'BooleanLiteral' && typeof value !== 'boolean') {
throw invalidAst(node, 'value must be a boolean');
}
}
/**
* Validate that a node property is an array containing only strings.
*
* @param {Object} node the AST node the property belongs to, for the error
* @param {*} value the property value to validate
* @param {string} name the property name, used in the error message
* @returns {string[]} the validated array
* @throws {Exception} if the value is not an array or contains non-strings
*/
function validateStringArray(node, value, name) {
if (!_utils.isArray(value)) {
throw invalidAst(node, name + ' must be an array');
}
for (var i = 0; i < value.length; i++) {
if (typeof value[i] !== 'string') {
throw invalidAst(node, name + ' must only contain strings');
}
}
return value;
}
/**
* Validate the `parts` of a PathExpression node.
*
* @param {Object} path the PathExpression node
* @returns {string[]} the validated parts
* @throws {Exception} if `parts` is not an array of strings
*/
function validateParts(path) {
return validateStringArray(path, path.parts, 'parts');
}
/**
* Validate the optional `blockParams` of a Program node. Its length is
* written into the generated code, so it must be an array of strings when
* present.
*
* @param {Object} program the Program node
* @throws {Exception} if `blockParams` is present and not an array of strings
*/
function validateBlockParams(program) {
if (program.blockParams != null) {
validateStringArray(program, program.blockParams, 'blockParams');
}
}
function argEquals(a, b) {
if (a === b) {
return true;
}
if (_utils.isArray(a) && _utils.isArray(b) && a.length === b.length) {
for (var i = 0; i < a.length; i++) {
if (!argEquals(a[i], b[i])) {
return false;
}
}
return true;
}
}
function transformLiteralToPath(sexpr) {
if (!sexpr.path.parts) {
var literal = sexpr.path;
// Casting to string here to make false and 0 literal values play nicely with the rest
// of the system.
sexpr.path = {
type: 'PathExpression',
data: false,
depth: 0,
parts: [literal.original + ''],
original: literal.original + '',
loc: literal.loc
};
}
}
//# 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eslint-disable new-cap */\n\nimport Exception from '../exception';\nimport { isArray, indexOf, extend } from '../utils';\nimport AST from './ast';\nimport { NODE_TYPES } from './node-types';\n\nconst slice = [].slice;\n\nexport function Compiler() {}\n\n// the foundHelper register will disambiguate helper lookup from finding a\n// function in a context. This is necessary for mustache compatibility, which\n// requires that context functions in blocks are evaluated by blockHelperMissing,\n// and then proceed as if the resulting value was provided to blockHelperMissing.\n\nCompiler.prototype = {\n  compiler: Compiler,\n\n  equals: function(other) {\n    let len = this.opcodes.length;\n    if (other.opcodes.length !== len) {\n      return false;\n    }\n\n    for (let i = 0; i < len; i++) {\n      let opcode = this.opcodes[i],\n        otherOpcode = other.opcodes[i];\n      if (\n        opcode.opcode !== otherOpcode.opcode ||\n        !argEquals(opcode.args, otherOpcode.args)\n      ) {\n        return false;\n      }\n    }\n\n    // We know that length is the same between the two arrays because they are directly tied\n    // to the opcode behavior above.\n    len = this.children.length;\n    for (let i = 0; i < len; i++) {\n      if (!this.children[i].equals(other.children[i])) {\n        return false;\n      }\n    }\n\n    return true;\n  },\n\n  guid: 0,\n\n  compile: function(program, options) {\n    this.sourceNode = [];\n    this.opcodes = [];\n    this.children = [];\n    this.options = options;\n    this.stringParams = options.stringParams;\n    this.trackIds = options.trackIds;\n\n    options.blockParams = options.blockParams || [];\n\n    options.knownHelpers = extend(\n      Object.create(null),\n      {\n        helperMissing: true,\n        blockHelperMissing: true,\n        each: true,\n        if: true,\n        unless: true,\n        with: true,\n        log: true,\n        lookup: true\n      },\n      options.knownHelpers\n    );\n\n    return this.accept(program);\n  },\n\n  compileProgram: function(program) {\n    let childCompiler = new this.compiler(), // eslint-disable-line new-cap\n      result = childCompiler.compile(program, this.options),\n      guid = this.guid++;\n\n    this.usePartial = this.usePartial || result.usePartial;\n\n    this.children[guid] = result;\n    this.useDepths = this.useDepths || result.useDepths;\n\n    return guid;\n  },\n\n  accept: function(node) {\n    // Dispatching on an unknown type could call an arbitrary Compiler method.\n    if (indexOf(NODE_TYPES, node.type) === -1 || !this[node.type]) {\n      throw new Exception('Unknown type: ' + node.type, node);\n    }\n\n    this.sourceNode.unshift(node);\n    let ret = this[node.type](node);\n    this.sourceNode.shift();\n    return ret;\n  },\n\n  Program: function(program) {\n    validateBlockParams(program);\n    this.options.blockParams.unshift(program.blockParams);\n\n    let body = program.body,\n      bodyLength = body.length;\n    for (let i = 0; i < bodyLength; i++) {\n      this.accept(body[i]);\n    }\n\n    this.options.blockParams.shift();\n\n    this.isSimple = bodyLength === 1;\n    this.blockParams = program.blockParams ? program.blockParams.length : 0;\n\n    return this;\n  },\n\n  BlockStatement: function(block) {\n    transformLiteralToPath(block);\n\n    let program = block.program,\n      inverse = block.inverse;\n\n    program = program && this.compileProgram(program);\n    inverse = inverse && this.compileProgram(inverse);\n\n    let type = this.classifySexpr(block);\n\n    if (type === 'helper') {\n      this.helperSexpr(block, program, inverse);\n    } else if (type === 'simple') {\n      this.simpleSexpr(block);\n\n      // now that the simple mustache is resolved, we need to\n      // evaluate it by executing `blockHelperMissing`\n      this.opcode('pushProgram', program);\n      this.opcode('pushProgram', inverse);\n      this.opcode('emptyHash');\n      this.opcode('blockValue', block.path.original);\n    } else {\n      this.ambiguousSexpr(block, program, inverse);\n\n      // now that the simple mustache is resolved, we need to\n      // evaluate it by executing `blockHelperMissing`\n      this.opcode('pushProgram', program);\n      this.opcode('pushProgram', inverse);\n      this.opcode('emptyHash');\n      this.opcode('ambiguousBlockValue');\n    }\n\n    this.opcode('append');\n  },\n\n  DecoratorBlock(decorator) {\n    let program = decorator.program && this.compileProgram(decorator.program);\n    let params = this.setupFullMustacheParams(decorator, program, undefined),\n      path = decorator.path;\n\n    this.useDecorators = true;\n    this.opcode('registerDecorator', params.length, path.original);\n  },\n\n  PartialStatement: function(partial) {\n    this.usePartial = true;\n\n    let program = partial.program;\n    if (program) {\n      program = this.compileProgram(partial.program);\n    }\n\n    let params = partial.params;\n    if (params.length > 1) {\n      throw new Exception(\n        'Unsupported number of partial arguments: ' + params.length,\n        partial\n      );\n    } else if (!params.length) {\n      if (this.options.explicitPartialContext) {\n        this.opcode('pushLiteral', 'undefined');\n      } else {\n        params.push({ type: 'PathExpression', parts: [], depth: 0 });\n      }\n    }\n\n    let partialName = partial.name.original,\n      isDynamic = partial.name.type === 'SubExpression';\n    if (isDynamic) {\n      this.accept(partial.name);\n    }\n\n    this.setupFullMustacheParams(partial, program, undefined, true);\n\n    let indent = partial.indent || '';\n    if (this.options.preventIndent && indent) {\n      this.opcode('appendContent', indent);\n      indent = '';\n    }\n\n    this.opcode('invokePartial', isDynamic, partialName, indent);\n    this.opcode('append');\n  },\n  PartialBlockStatement: function(partialBlock) {\n    this.PartialStatement(partialBlock);\n  },\n\n  MustacheStatement: function(mustache) {\n    this.SubExpression(mustache);\n\n    if (mustache.escaped && !this.options.noEscape) {\n      this.opcode('appendEscaped');\n    } else {\n      this.opcode('append');\n    }\n  },\n  Decorator(decorator) {\n    this.DecoratorBlock(decorator);\n  },\n\n  ContentStatement: function(content) {\n    if (content.value != null && typeof content.value !== 'string') {\n      throw invalidAst(content, 'value must be a string');\n    }\n    if (content.value) {\n      this.opcode('appendContent', content.value);\n    }\n  },\n\n  CommentStatement: function() {},\n\n  SubExpression: function(sexpr) {\n    transformLiteralToPath(sexpr);\n    let type = this.classifySexpr(sexpr);\n\n    if (type === 'simple') {\n      this.simpleSexpr(sexpr);\n    } else if (type === 'helper') {\n      this.helperSexpr(sexpr);\n    } else {\n      this.ambiguousSexpr(sexpr);\n    }\n  },\n  ambiguousSexpr: function(sexpr, program, inverse) {\n    let path = sexpr.path,\n      name = path.parts[0],\n      isBlock = program != null || inverse != null;\n\n    this.opcode('getContext', validateDepth(path));\n\n    this.opcode('pushProgram', program);\n    this.opcode('pushProgram', inverse);\n\n    path.strict = true;\n    this.accept(path);\n\n    this.opcode('invokeAmbiguous', name, isBlock);\n  },\n\n  simpleSexpr: function(sexpr) {\n    let path = sexpr.path;\n    path.strict = true;\n    this.accept(path);\n    this.opcode('resolvePossibleLambda');\n  },\n\n  helperSexpr: function(sexpr, program, inverse) {\n    let params = this.setupFullMustacheParams(sexpr, program, inverse),\n      path = sexpr.path,\n      name = path.parts[0];\n\n    if (this.options.knownHelpers[name]) {\n      this.opcode('invokeKnownHelper', params.length, name);\n    } else if (this.options.knownHelpersOnly) {\n      throw new Exception(\n        'You specified knownHelpersOnly, but used the unknown helper ' + name,\n        sexpr\n      );\n    } else {\n      path.strict = true;\n      path.falsy = true;\n\n      this.accept(path);\n      this.opcode(\n        'invokeHelper',\n        params.length,\n        path.original,\n        AST.helpers.simpleId(path)\n      );\n    }\n  },\n\n  PathExpression: function(path) {\n    // Validate AST values at the compiler boundary: javascript-compiler.js\n    // trusts all opcode arguments to be safe.\n    const depth = validateDepth(path);\n    const parts = validateParts(path);\n\n    this.addDepth(depth);\n    this.opcode('getContext', depth);\n\n    let name = parts[0],\n      scoped = AST.helpers.scopedId(path),\n      blockParamId = !depth && !scoped && this.blockParamIndex(name);\n\n    if (blockParamId) {\n      this.opcode('lookupBlockParam', blockParamId, parts);\n    } else if (!name) {\n      // Context reference, i.e. `{{foo .}}` or `{{foo ..}}`\n      this.opcode('pushContext');\n    } else if (path.data) {\n      this.options.data = true;\n      this.opcode('lookupData', depth, parts, path.strict);\n    } else {\n      this.opcode('lookupOnContext', parts, path.falsy, path.strict, scoped);\n    }\n  },\n\n  StringLiteral: function(string) {\n    validateLiteral(string);\n    this.opcode('pushString', string.value);\n  },\n\n  NumberLiteral: function(number) {\n    validateLiteral(number);\n    this.opcode('pushLiteral', number.value);\n  },\n\n  BooleanLiteral: function(bool) {\n    validateLiteral(bool);\n    this.opcode('pushLiteral', bool.value);\n  },\n\n  UndefinedLiteral: function() {\n    this.opcode('pushLiteral', 'undefined');\n  },\n\n  NullLiteral: function() {\n    this.opcode('pushLiteral', 'null');\n  },\n\n  Hash: function(hash) {\n    let pairs = hash.pairs,\n      i = 0,\n      l;\n\n    if (!isArray(pairs)) {\n      throw invalidAst(hash, 'pairs must be an array');\n    }\n    l = pairs.length;\n    for (let j = 0; j < l; j++) {\n      if (!pairs[j] || typeof pairs[j].key !== 'string') {\n        throw invalidAst(hash, 'pair keys must be strings');\n      }\n    }\n\n    this.opcode('pushHash');\n\n    for (; i < l; i++) {\n      this.pushParam(pairs[i].value);\n    }\n    while (i--) {\n      this.opcode('assignToHash', pairs[i].key);\n    }\n    this.opcode('popHash');\n  },\n\n  // HELPERS\n  opcode: function(name) {\n    this.opcodes.push({\n      opcode: name,\n      args: slice.call(arguments, 1),\n      loc: this.sourceNode[0].loc\n    });\n  },\n\n  addDepth: function(depth) {\n    if (!depth) {\n      return;\n    }\n\n    this.useDepths = true;\n  },\n\n  classifySexpr: function(sexpr) {\n    // The first part is used as a helper name below, e.g. for known helpers,\n    // before the PathExpression handler gets to validate the parts.\n    validateParts(sexpr.path);\n    let isSimple = AST.helpers.simpleId(sexpr.path);\n\n    let isBlockParam = isSimple && !!this.blockParamIndex(sexpr.path.parts[0]);\n\n    // a mustache is an eligible helper if:\n    // * its id is simple (a single part, not `this` or `..`)\n    let isHelper = !isBlockParam && AST.helpers.helperExpression(sexpr);\n\n    // if a mustache is an eligible helper but not a definite\n    // helper, it is ambiguous, and will be resolved in a later\n    // pass or at runtime.\n    let isEligible = !isBlockParam && (isHelper || isSimple);\n\n    // if ambiguous, we can possibly resolve the ambiguity now\n    // An eligible helper is one that does not have a complex path, i.e. `this.foo`, `../foo` etc.\n    if (isEligible && !isHelper) {\n      let name = sexpr.path.parts[0],\n        options = this.options;\n      if (options.knownHelpers[name]) {\n        isHelper = true;\n      } else if (options.knownHelpersOnly) {\n        isEligible = false;\n      }\n    }\n\n    if (isHelper) {\n      return 'helper';\n    } else if (isEligible) {\n      return 'ambiguous';\n    } else {\n      return 'simple';\n    }\n  },\n\n  pushParams: function(params) {\n    for (let i = 0, l = params.length; i < l; i++) {\n      this.pushParam(params[i]);\n    }\n  },\n\n  pushParam: function(val) {\n    // Literal params are not visited by their node handlers in stringParams\n    // mode, so their values must be validated here as well.\n    validateLiteral(val);\n    let value = val.value != null ? val.value : val.original || '';\n    let depth = validateDepth(val);\n\n    if (this.stringParams) {\n      // pushStringParam emits non-string values as raw JavaScript literals.\n      // Literal values are validated above, but `original` is not, so\n      // anything that is not a number or boolean is stringified.\n      if (typeof value !== 'number' && typeof value !== 'boolean') {\n        value = String(value);\n      }\n      if (value.replace) {\n        value = value.replace(/^(\\.?\\.\\/)*/g, '').replace(/\\//g, '.');\n      }\n      if (depth) {\n        this.addDepth(depth);\n      }\n      this.opcode('getContext', depth);\n      this.opcode('pushStringParam', value, val.type);\n\n      if (val.type === 'SubExpression') {\n        // SubExpressions get evaluated and passed in\n        // in string params mode.\n        this.accept(val);\n      }\n    } else {\n      if (this.trackIds) {\n        let blockParamIndex;\n        if (val.parts && !AST.helpers.scopedId(val) && !depth) {\n          // The parts are read here before the PathExpression handler,\n          // invoked by accept() below, gets to validate them.\n          blockParamIndex = this.blockParamIndex(validateParts(val)[0]);\n        }\n        if (blockParamIndex) {\n          let blockParamChild = val.parts.slice(1).join('.');\n          this.opcode('pushId', 'BlockParam', blockParamIndex, blockParamChild);\n        } else {\n          value = val.original || value;\n          if (value.replace) {\n            value = value\n              .replace(/^this(?:\\.|$)/, '')\n              .replace(/^\\.\\//, '')\n              .replace(/^\\.$/, '');\n          }\n\n          this.opcode('pushId', val.type, value);\n        }\n      }\n      this.accept(val);\n    }\n  },\n\n  setupFullMustacheParams: function(sexpr, program, inverse, omitEmpty) {\n    let params = sexpr.params;\n    this.pushParams(params);\n\n    this.opcode('pushProgram', program);\n    this.opcode('pushProgram', inverse);\n\n    if (sexpr.hash) {\n      this.accept(sexpr.hash);\n    } else {\n      this.opcode('emptyHash', omitEmpty);\n    }\n\n    return params;\n  },\n\n  blockParamIndex: function(name) {\n    for (\n      let depth = 0, len = this.options.blockParams.length;\n      depth < len;\n      depth++\n    ) {\n      let blockParams = this.options.blockParams[depth],\n        param = blockParams && indexOf(blockParams, name);\n      if (blockParams && param >= 0) {\n        return [depth, param];\n      }\n    }\n  }\n};\n\nexport function precompile(input, options, env) {\n  if (\n    input == null ||\n    (typeof input !== 'string' && input.type !== 'Program')\n  ) {\n    throw new Exception(\n      'You must pass a string or Handlebars AST to Handlebars.precompile. You passed ' +\n        input\n    );\n  }\n\n  options = options || {};\n  if (!('data' in options)) {\n    options.data = true;\n  }\n  if (options.compat) {\n    options.useDepths = true;\n  }\n\n  let ast = env.parse(input, options),\n    environment = new env.Compiler().compile(ast, options);\n  return new env.JavaScriptCompiler().compile(environment, options);\n}\n\nexport function compile(input, options = {}, env) {\n  if (\n    input == null ||\n    (typeof input !== 'string' && input.type !== 'Program')\n  ) {\n    throw new Exception(\n      'You must pass a string or Handlebars AST to Handlebars.compile. You passed ' +\n        input\n    );\n  }\n\n  options = extend({}, options);\n  if (!('data' in options)) {\n    options.data = true;\n  }\n  if (options.compat) {\n    options.useDepths = true;\n  }\n\n  let compiled;\n\n  function compileInput() {\n    let ast = env.parse(input, options),\n      environment = new env.Compiler().compile(ast, options),\n      templateSpec = new env.JavaScriptCompiler().compile(\n        environment,\n        options,\n        undefined,\n        true\n      );\n    return env.template(templateSpec);\n  }\n\n  // Template is only compiled on first use and cached after that point.\n  function ret(context, execOptions) {\n    if (!compiled) {\n      compiled = compileInput();\n    }\n    return compiled.call(this, context, execOptions);\n  }\n  ret._setup = function(setupOptions) {\n    if (!compiled) {\n      compiled = compileInput();\n    }\n    return compiled._setup(setupOptions);\n  };\n  ret._child = function(i, data, blockParams, depths) {\n    if (!compiled) {\n      compiled = compileInput();\n    }\n    return compiled._child(i, data, blockParams, depths);\n  };\n  return ret;\n}\n\n/**\n * Create the exception thrown for an AST node that fails validation.\n *\n * @param {Object} node the offending AST node; its `type` is included in the\n *   message and its `loc`, if present, in the error location\n * @param {string} message what is wrong with the node\n * @returns {Exception} the exception to throw\n */\nfunction invalidAst(node, message) {\n  return new Exception('Invalid AST: ' + node.type + ' ' + message, node);\n}\n\n/**\n * Validate the `depth` of a path or param node.\n *\n * A missing depth is treated as 0, because ASTs built by hand or by other\n * tools commonly omit it. Any depth that is present must be a non-negative\n * integer, since it is written into the generated code.\n *\n * @param {Object} node the AST node whose `depth` is validated\n * @returns {number} the validated depth, or 0 if the node has none\n * @throws {Exception} if the depth is present but not a non-negative integer\n */\nfunction validateDepth(node) {\n  let depth = node.depth;\n  if (depth == null) {\n    return 0;\n  }\n  if (\n    typeof depth !== 'number' ||\n    !isFinite(depth) ||\n    Math.floor(depth) !== depth ||\n    depth < 0\n  ) {\n    throw invalidAst(node, 'depth must be a non-negative integer');\n  }\n  return depth;\n}\n\n/**\n * Validate the `value` of a StringLiteral, NumberLiteral or BooleanLiteral.\n *\n * Literal values are written into the generated code, so they must have\n * exactly the type their node promises. Nodes of any other type pass through\n * unchanged.\n *\n * Numbers need not be finite: the parser produces Infinity for very long\n * number literals, and Infinity and NaN are emitted as the read-only globals\n * of the same name.\n *\n * @param {Object} node the AST node to validate\n * @throws {Exception} if the value does not match the literal type\n */\nfunction validateLiteral(node) {\n  let value = node.value;\n  if (node.type === 'StringLiteral' && typeof value !== 'string') {\n    throw invalidAst(node, 'value must be a string');\n  } else if (node.type === 'NumberLiteral' && typeof value !== 'number') {\n    throw invalidAst(node, 'value must be a number');\n  } else if (node.type === 'BooleanLiteral' && typeof value !== 'boolean') {\n    throw invalidAst(node, 'value must be a boolean');\n  }\n}\n\n/**\n * Validate that a node property is an array containing only strings.\n *\n * @param {Object} node the AST node the property belongs to, for the error\n * @param {*} value the property value to validate\n * @param {string} name the property name, used in the error message\n * @returns {string[]} the validated array\n * @throws {Exception} if the value is not an array or contains non-strings\n */\nfunction validateStringArray(node, value, name) {\n  if (!isArray(value)) {\n    throw invalidAst(node, name + ' must be an array');\n  }\n  for (let i = 0; i < value.length; i++) {\n    if (typeof value[i] !== 'string') {\n      throw invalidAst(node, name + ' must only contain strings');\n    }\n  }\n  return value;\n}\n\n/**\n * Validate the `parts` of a PathExpression node.\n *\n * @param {Object} path the PathExpression node\n * @returns {string[]} the validated parts\n * @throws {Exception} if `parts` is not an array of strings\n */\nfunction validateParts(path) {\n  return validateStringArray(path, path.parts, 'parts');\n}\n\n/**\n * Validate the optional `blockParams` of a Program node. Its length is\n * written into the generated code, so it must be an array of strings when\n * present.\n *\n * @param {Object} program the Program node\n * @throws {Exception} if `blockParams` is present and not an array of strings\n */\nfunction validateBlockParams(program) {\n  if (program.blockParams != null) {\n    validateStringArray(program, program.blockParams, 'blockParams');\n  }\n}\n\nfunction argEquals(a, b) {\n  if (a === b) {\n    return true;\n  }\n\n  if (isArray(a) && isArray(b) && a.length === b.length) {\n    for (let i = 0; i < a.length; i++) {\n      if (!argEquals(a[i], b[i])) {\n        return false;\n      }\n    }\n    return true;\n  }\n}\n\nfunction transformLiteralToPath(sexpr) {\n  if (!sexpr.path.parts) {\n    let literal = sexpr.path;\n    // Casting to string here to make false and 0 literal values play nicely with the rest\n    // of the system.\n    sexpr.path = {\n      type: 'PathExpression',\n      data: false,\n      depth: 0,\n      parts: [literal.original + ''],\n      original: literal.original + '',\n      loc: literal.loc\n    };\n  }\n}\n"]}