1/* eslint-disable new-cap */ 2 3'use strict'; 4 5exports.__esModule = true; 6exports.Compiler = Compiler; 7exports.precompile = precompile; 8exports.compile = compile; 9// istanbul ignore next 10 11function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; } 12 13var _exception = require('../exception'); 14 15var _exception2 = _interopRequireDefault(_exception); 16 17var _utils = require('../utils'); 18 19var _ast = require('./ast'); 20 21var _ast2 = _interopRequireDefault(_ast); 22 23var slice = [].slice; 24 25function Compiler() {} 26 27// the foundHelper register will disambiguate helper lookup from finding a 28// function in a context. This is necessary for mustache compatibility, which 29// requires that context functions in blocks are evaluated by blockHelperMissing, 30// and then proceed as if the resulting value was provided to blockHelperMissing. 31 32Compiler.prototype = { 33 compiler: Compiler, 34 35 equals: function equals(other) { 36 var len = this.opcodes.length; 37 if (other.opcodes.length !== len) { 38 return false; 39 } 40 41 for (var i = 0; i < len; i++) { 42 var opcode = this.opcodes[i], 43 otherOpcode = other.opcodes[i]; 44 if (opcode.opcode !== otherOpcode.opcode || !argEquals(opcode.args, otherOpcode.args)) { 45 return false; 46 } 47 } 48 49 // We know that length is the same between the two arrays because they are directly tied 50 // to the opcode behavior above. 51 len = this.children.length; 52 for (var i = 0; i < len; i++) { 53 if (!this.children[i].equals(other.children[i])) { 54 return false; 55 } 56 } 57 58 return true; 59 }, 60 61 guid: 0, 62 63 compile: function compile(program, options) { 64 this.sourceNode = []; 65 this.opcodes = []; 66 this.children = []; 67 this.options = options; 68 this.stringParams = options.stringParams; 69 this.trackIds = options.trackIds; 70 71 options.blockParams = options.blockParams || []; 72 73 options.knownHelpers = _utils.extend(Object.create(null), { 74 helperMissing: true, 75 blockHelperMissing: true, 76 each: true, 77 'if': true, 78 unless: true, 79 'with': true, 80 log: true, 81 lookup: true 82 }, options.knownHelpers); 83 84 return this.accept(program); 85 }, 86 87 compileProgram: function compileProgram(program) { 88 var childCompiler = new this.compiler(), 89 // eslint-disable-line new-cap 90 result = childCompiler.compile(program, this.options), 91 guid = this.guid++; 92 93 this.usePartial = this.usePartial || result.usePartial; 94 95 this.children[guid] = result; 96 this.useDepths = this.useDepths || result.useDepths; 97 98 return guid; 99 }, 100 101 accept: function accept(node) { 102 /* istanbul ignore next: Sanity code */ 103 if (!this[node.type]) { 104 throw new _exception2['default']('Unknown type: ' + node.type, node); 105 } 106 107 this.sourceNode.unshift(node); 108 var ret = this[node.type](node); 109 this.sourceNode.shift(); 110 return ret; 111 }, 112 113 Program: function Program(program) { 114 this.options.blockParams.unshift(program.blockParams); 115 116 var body = program.body, 117 bodyLength = body.length; 118 for (var i = 0; i < bodyLength; i++) { 119 this.accept(body[i]); 120 } 121 122 this.options.blockParams.shift(); 123 124 this.isSimple = bodyLength === 1; 125 this.blockParams = program.blockParams ? program.blockParams.length : 0; 126 127 return this; 128 }, 129 130 BlockStatement: function BlockStatement(block) { 131 transformLiteralToPath(block); 132 133 var program = block.program, 134 inverse = block.inverse; 135 136 program = program && this.compileProgram(program); 137 inverse = inverse && this.compileProgram(inverse); 138 139 var type = this.classifySexpr(block); 140 141 if (type === 'helper') { 142 this.helperSexpr(block, program, inverse); 143 } else if (type === 'simple') { 144 this.simpleSexpr(block); 145 146 // now that the simple mustache is resolved, we need to 147 // evaluate it by executing `blockHelperMissing` 148 this.opcode('pushProgram', program); 149 this.opcode('pushProgram', inverse); 150 this.opcode('emptyHash'); 151 this.opcode('blockValue', block.path.original); 152 } else { 153 this.ambiguousSexpr(block, program, inverse); 154 155 // now that the simple mustache is resolved, we need to 156 // evaluate it by executing `blockHelperMissing` 157 this.opcode('pushProgram', program); 158 this.opcode('pushProgram', inverse); 159 this.opcode('emptyHash'); 160 this.opcode('ambiguousBlockValue'); 161 } 162 163 this.opcode('append'); 164 }, 165 166 DecoratorBlock: function DecoratorBlock(decorator) { 167 var program = decorator.program && this.compileProgram(decorator.program); 168 var params = this.setupFullMustacheParams(decorator, program, undefined), 169 path = decorator.path; 170 171 this.useDecorators = true; 172 this.opcode('registerDecorator', params.length, path.original); 173 }, 174 175 PartialStatement: function PartialStatement(partial) { 176 this.usePartial = true; 177 178 var program = partial.program; 179 if (program) { 180 program = this.compileProgram(partial.program); 181 } 182 183 var params = partial.params; 184 if (params.length > 1) { 185 throw new _exception2['default']('Unsupported number of partial arguments: ' + params.length, partial); 186 } else if (!params.length) { 187 if (this.options.explicitPartialContext) { 188 this.opcode('pushLiteral', 'undefined'); 189 } else { 190 params.push({ type: 'PathExpression', parts: [], depth: 0 }); 191 } 192 } 193 194 var partialName = partial.name.original, 195 isDynamic = partial.name.type === 'SubExpression'; 196 if (isDynamic) { 197 this.accept(partial.name); 198 } 199 200 this.setupFullMustacheParams(partial, program, undefined, true); 201 202 var indent = partial.indent || ''; 203 if (this.options.preventIndent && indent) { 204 this.opcode('appendContent', indent); 205 indent = ''; 206 } 207 208 this.opcode('invokePartial', isDynamic, partialName, indent); 209 this.opcode('append'); 210 }, 211 PartialBlockStatement: function PartialBlockStatement(partialBlock) { 212 this.PartialStatement(partialBlock); 213 }, 214 215 MustacheStatement: function MustacheStatement(mustache) { 216 this.SubExpression(mustache); 217 218 if (mustache.escaped && !this.options.noEscape) { 219 this.opcode('appendEscaped'); 220 } else { 221 this.opcode('append'); 222 } 223 }, 224 Decorator: function Decorator(decorator) { 225 this.DecoratorBlock(decorator); 226 }, 227 228 ContentStatement: function ContentStatement(content) { 229 if (content.value) { 230 this.opcode('appendContent', content.value); 231 } 232 }, 233 234 CommentStatement: function CommentStatement() {}, 235 236 SubExpression: function SubExpression(sexpr) { 237 transformLiteralToPath(sexpr); 238 var type = this.classifySexpr(sexpr); 239 240 if (type === 'simple') { 241 this.simpleSexpr(sexpr); 242 } else if (type === 'helper') { 243 this.helperSexpr(sexpr); 244 } else { 245 this.ambiguousSexpr(sexpr); 246 } 247 }, 248 ambiguousSexpr: function ambiguousSexpr(sexpr, program, inverse) { 249 var path = sexpr.path, 250 name = path.parts[0], 251 isBlock = program != null || inverse != null; 252 253 this.opcode('getContext', path.depth); 254 255 this.opcode('pushProgram', program); 256 this.opcode('pushProgram', inverse); 257 258 path.strict = true; 259 this.accept(path); 260 261 this.opcode('invokeAmbiguous', name, isBlock); 262 }, 263 264 simpleSexpr: function simpleSexpr(sexpr) { 265 var path = sexpr.path; 266 path.strict = true; 267 this.accept(path); 268 this.opcode('resolvePossibleLambda'); 269 }, 270 271 helperSexpr: function helperSexpr(sexpr, program, inverse) { 272 var params = this.setupFullMustacheParams(sexpr, program, inverse), 273 path = sexpr.path, 274 name = path.parts[0]; 275 276 if (this.options.knownHelpers[name]) { 277 this.opcode('invokeKnownHelper', params.length, name); 278 } else if (this.options.knownHelpersOnly) { 279 throw new _exception2['default']('You specified knownHelpersOnly, but used the unknown helper ' + name, sexpr); 280 } else { 281 path.strict = true; 282 path.falsy = true; 283 284 this.accept(path); 285 this.opcode('invokeHelper', params.length, path.original, _ast2['default'].helpers.simpleId(path)); 286 } 287 }, 288 289 PathExpression: function PathExpression(path) { 290 this.addDepth(path.depth); 291 this.opcode('getContext', path.depth); 292 293 var name = path.parts[0], 294 scoped = _ast2['default'].helpers.scopedId(path), 295 blockParamId = !path.depth && !scoped && this.blockParamIndex(name); 296 297 if (blockParamId) { 298 this.opcode('lookupBlockParam', blockParamId, path.parts); 299 } else if (!name) { 300 // Context reference, i.e. `{{foo .}}` or `{{foo ..}}` 301 this.opcode('pushContext'); 302 } else if (path.data) { 303 this.options.data = true; 304 this.opcode('lookupData', path.depth, path.parts, path.strict); 305 } else { 306 this.opcode('lookupOnContext', path.parts, path.falsy, path.strict, scoped); 307 } 308 }, 309 310 StringLiteral: function StringLiteral(string) { 311 this.opcode('pushString', string.value); 312 }, 313 314 NumberLiteral: function NumberLiteral(number) { 315 this.opcode('pushLiteral', number.value); 316 }, 317 318 BooleanLiteral: function BooleanLiteral(bool) { 319 this.opcode('pushLiteral', bool.value); 320 }, 321 322 UndefinedLiteral: function UndefinedLiteral() { 323 this.opcode('pushLiteral', 'undefined'); 324 }, 325 326 NullLiteral: function NullLiteral() { 327 this.opcode('pushLiteral', 'null'); 328 }, 329 330 Hash: function Hash(hash) { 331 var pairs = hash.pairs, 332 i = 0, 333 l = pairs.length; 334 335 this.opcode('pushHash'); 336 337 for (; i < l; i++) { 338 this.pushParam(pairs[i].value); 339 } 340 while (i--) { 341 this.opcode('assignToHash', pairs[i].key); 342 } 343 this.opcode('popHash'); 344 }, 345 346 // HELPERS 347 opcode: function opcode(name) { 348 this.opcodes.push({ 349 opcode: name, 350 args: slice.call(arguments, 1), 351 loc: this.sourceNode[0].loc 352 }); 353 }, 354 355 addDepth: function addDepth(depth) { 356 if (!depth) { 357 return; 358 } 359 360 this.useDepths = true; 361 }, 362 363 classifySexpr: function classifySexpr(sexpr) { 364 var isSimple = _ast2['default'].helpers.simpleId(sexpr.path); 365 366 var isBlockParam = isSimple && !!this.blockParamIndex(sexpr.path.parts[0]); 367 368 // a mustache is an eligible helper if: 369 // * its id is simple (a single part, not `this` or `..`) 370 var isHelper = !isBlockParam && _ast2['default'].helpers.helperExpression(sexpr); 371 372 // if a mustache is an eligible helper but not a definite 373 // helper, it is ambiguous, and will be resolved in a later 374 // pass or at runtime. 375 var isEligible = !isBlockParam && (isHelper || isSimple); 376 377 // if ambiguous, we can possibly resolve the ambiguity now 378 // An eligible helper is one that does not have a complex path, i.e. `this.foo`, `../foo` etc. 379 if (isEligible && !isHelper) { 380 var _name = sexpr.path.parts[0], 381 options = this.options; 382 if (options.knownHelpers[_name]) { 383 isHelper = true; 384 } else if (options.knownHelpersOnly) { 385 isEligible = false; 386 } 387 } 388 389 if (isHelper) { 390 return 'helper'; 391 } else if (isEligible) { 392 return 'ambiguous'; 393 } else { 394 return 'simple'; 395 } 396 }, 397 398 pushParams: function pushParams(params) { 399 for (var i = 0, l = params.length; i < l; i++) { 400 this.pushParam(params[i]); 401 } 402 }, 403 404 pushParam: function pushParam(val) { 405 var value = val.value != null ? val.value : val.original || ''; 406 407 if (this.stringParams) { 408 if (value.replace) { 409 value = value.replace(/^(\.?\.\/)*/g, '').replace(/\//g, '.'); 410 } 411 412 if (val.depth) { 413 this.addDepth(val.depth); 414 } 415 this.opcode('getContext', val.depth || 0); 416 this.opcode('pushStringParam', value, val.type); 417 418 if (val.type === 'SubExpression') { 419 // SubExpressions get evaluated and passed in 420 // in string params mode. 421 this.accept(val); 422 } 423 } else { 424 if (this.trackIds) { 425 var blockParamIndex = undefined; 426 if (val.parts && !_ast2['default'].helpers.scopedId(val) && !val.depth) { 427 blockParamIndex = this.blockParamIndex(val.parts[0]); 428 } 429 if (blockParamIndex) { 430 var blockParamChild = val.parts.slice(1).join('.'); 431 this.opcode('pushId', 'BlockParam', blockParamIndex, blockParamChild); 432 } else { 433 value = val.original || value; 434 if (value.replace) { 435 value = value.replace(/^this(?:\.|$)/, '').replace(/^\.\//, '').replace(/^\.$/, ''); 436 } 437 438 this.opcode('pushId', val.type, value); 439 } 440 } 441 this.accept(val); 442 } 443 }, 444 445 setupFullMustacheParams: function setupFullMustacheParams(sexpr, program, inverse, omitEmpty) { 446 var params = sexpr.params; 447 this.pushParams(params); 448 449 this.opcode('pushProgram', program); 450 this.opcode('pushProgram', inverse); 451 452 if (sexpr.hash) { 453 this.accept(sexpr.hash); 454 } else { 455 this.opcode('emptyHash', omitEmpty); 456 } 457 458 return params; 459 }, 460 461 blockParamIndex: function blockParamIndex(name) { 462 for (var depth = 0, len = this.options.blockParams.length; depth < len; depth++) { 463 var blockParams = this.options.blockParams[depth], 464 param = blockParams && _utils.indexOf(blockParams, name); 465 if (blockParams && param >= 0) { 466 return [depth, param]; 467 } 468 } 469 } 470}; 471 472function precompile(input, options, env) { 473 if (input == null || typeof input !== 'string' && input.type !== 'Program') { 474 throw new _exception2['default']('You must pass a string or Handlebars AST to Handlebars.precompile. You passed ' + input); 475 } 476 477 options = options || {}; 478 if (!('data' in options)) { 479 options.data = true; 480 } 481 if (options.compat) { 482 options.useDepths = true; 483 } 484 485 var ast = env.parse(input, options), 486 environment = new env.Compiler().compile(ast, options); 487 return new env.JavaScriptCompiler().compile(environment, options); 488} 489 490function compile(input, options, env) { 491 if (options === undefined) options = {}; 492 493 if (input == null || typeof input !== 'string' && input.type !== 'Program') { 494 throw new _exception2['default']('You must pass a string or Handlebars AST to Handlebars.compile. You passed ' + input); 495 } 496 497 options = _utils.extend({}, options); 498 if (!('data' in options)) { 499 options.data = true; 500 } 501 if (options.compat) { 502 options.useDepths = true; 503 } 504 505 var compiled = undefined; 506 507 function compileInput() { 508 var ast = env.parse(input, options), 509 environment = new env.Compiler().compile(ast, options), 510 templateSpec = new env.JavaScriptCompiler().compile(environment, options, undefined, true); 511 return env.template(templateSpec); 512 } 513 514 // Template is only compiled on first use and cached after that point. 515 function ret(context, execOptions) { 516 if (!compiled) { 517 compiled = compileInput(); 518 } 519 return compiled.call(this, context, execOptions); 520 } 521 ret._setup = function (setupOptions) { 522 if (!compiled) { 523 compiled = compileInput(); 524 } 525 return compiled._setup(setupOptions); 526 }; 527 ret._child = function (i, data, blockParams, depths) { 528 if (!compiled) { 529 compiled = compileInput(); 530 } 531 return compiled._child(i, data, blockParams, depths); 532 }; 533 return ret; 534} 535 536function argEquals(a, b) { 537 if (a === b) { 538 return true; 539 } 540 541 if (_utils.isArray(a) && _utils.isArray(b) && a.length === b.length) { 542 for (var i = 0; i < a.length; i++) { 543 if (!argEquals(a[i], b[i])) { 544 return false; 545 } 546 } 547 return true; 548 } 549} 550 551function transformLiteralToPath(sexpr) { 552 if (!sexpr.path.parts) { 553 var literal = sexpr.path; 554 // Casting to string here to make false and 0 literal values play nicely with the rest 555 // of the system. 556 sexpr.path = { 557 type: 'PathExpression', 558 data: false, 559 depth: 0, 560 parts: [literal.original + ''], 561 original: literal.original + '', 562 loc: literal.loc 563 }; 564 } 565} 566//# 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eslint-disable new-cap */\n\nimport Exception from '../exception';\nimport { isArray, indexOf, extend } from '../utils';\nimport AST from './ast';\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    /* istanbul ignore next: Sanity code */\n    if (!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    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) {\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', path.depth);\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    this.addDepth(path.depth);\n    this.opcode('getContext', path.depth);\n\n    let name = path.parts[0],\n      scoped = AST.helpers.scopedId(path),\n      blockParamId = !path.depth && !scoped && this.blockParamIndex(name);\n\n    if (blockParamId) {\n      this.opcode('lookupBlockParam', blockParamId, path.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', path.depth, path.parts, path.strict);\n    } else {\n      this.opcode(\n        'lookupOnContext',\n        path.parts,\n        path.falsy,\n        path.strict,\n        scoped\n      );\n    }\n  },\n\n  StringLiteral: function(string) {\n    this.opcode('pushString', string.value);\n  },\n\n  NumberLiteral: function(number) {\n    this.opcode('pushLiteral', number.value);\n  },\n\n  BooleanLiteral: function(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 = pairs.length;\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    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    let value = val.value != null ? val.value : val.original || '';\n\n    if (this.stringParams) {\n      if (value.replace) {\n        value = value.replace(/^(\\.?\\.\\/)*/g, '').replace(/\\//g, '.');\n      }\n\n      if (val.depth) {\n        this.addDepth(val.depth);\n      }\n      this.opcode('getContext', val.depth || 0);\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) && !val.depth) {\n          blockParamIndex = this.blockParamIndex(val.parts[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\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"]} 567