--- /dev/null
+import { COMPILER_REVISION, REVISION_CHANGES } from "../base";
+import Exception from "../exception";
+
+function Literal(value) {
+ this.value = value;
+}
+
+function JavaScriptCompiler() {}
+
+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 (JavaScriptCompiler.isValidJavaScriptVariableName(name)) {
+ return parent + "." + name;
+ } else {
+ return parent + "['" + name + "']";
+ }
+ },
+ depthedLookup: function(name) {
+ this.aliases.lookup = 'this.lookup';
+
+ return 'lookup(depths, "' + name + '")';
+ },
+
+ compilerInfo: function() {
+ var revision = COMPILER_REVISION,
+ versions = REVISION_CHANGES[revision];
+ return [revision, versions];
+ },
+
+ appendToBuffer: function(string) {
+ if (this.environment.isSimple) {
+ return "return " + string + ";";
+ } else {
+ return {
+ appendToBuffer: true,
+ content: string,
+ toString: function() { 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.stringParams = this.options.stringParams;
+ this.trackIds = this.options.trackIds;
+ this.precompile = !asObject;
+
+ this.name = this.environment.name;
+ this.isChild = !!context;
+ this.context = context || {
+ programs: [],
+ environments: []
+ };
+
+ this.preamble();
+
+ this.stackSlot = 0;
+ this.stackVars = [];
+ this.aliases = {};
+ this.registers = { list: [] };
+ this.hashes = [];
+ this.compileStack = [];
+ this.inlineStack = [];
+
+ this.compileChildren(environment, options);
+
+ this.useDepths = this.useDepths || environment.depths.list.length || this.options.compat;
+
+ var opcodes = environment.opcodes,
+ opcode,
+ i,
+ l;
+
+ for (i = 0, l = opcodes.length; i < l; i++) {
+ opcode = opcodes[i];
+
+ this[opcode.opcode].apply(this, opcode.args);
+ }
+
+ // Flush any trailing content that might be pending.
+ this.pushSource('');
+
+ /* istanbul ignore next */
+ if (this.stackSlot || this.inlineStack.length || this.compileStack.length) {
+ throw new Exception('Compile completed with content left on stack');
+ }
+
+ var fn = this.createFunctionContext(asObject);
+ if (!this.isChild) {
+ var ret = {
+ compiler: this.compilerInfo(),
+ main: fn
+ };
+ var programs = this.context.programs;
+ for (i = 0, l = programs.length; i < l; i++) {
+ if (programs[i]) {
+ ret[i] = programs[i];
+ }
+ }
+
+ if (this.environment.usePartial) {
+ ret.usePartial = true;
+ }
+ if (this.options.data) {
+ ret.useData = true;
+ }
+ if (this.useDepths) {
+ ret.useDepths = true;
+ }
+ if (this.options.compat) {
+ ret.compat = true;
+ }
+
+ if (!asObject) {
+ ret.compiler = JSON.stringify(ret.compiler);
+ ret = this.objectLiteral(ret);
+ }
+
+ return ret;
+ } else {
+ return fn;
+ }
+ },
+
+ preamble: function() {
+ // track the last context pushed into place to allow skipping the
+ // getContext opcode when it would be a noop
+ this.lastContext = 0;
+ this.source = [];
+ },
+
+ createFunctionContext: function(asObject) {
+ var varDeclarations = '';
+
+ var locals = this.stackVars.concat(this.registers.list);
+ if(locals.length > 0) {
+ varDeclarations += ", " + locals.join(", ");
+ }
+
+ // Generate minimizer alias mappings
+ for (var alias in this.aliases) {
+ if (this.aliases.hasOwnProperty(alias)) {
+ varDeclarations += ', ' + alias + '=' + this.aliases[alias];
+ }
+ }
+
+ var params = ["depth0", "helpers", "partials", "data"];
+
+ if (this.useDepths) {
+ params.push('depths');
+ }
+
+ // Perform a second pass over the output to merge content when possible
+ var source = this.mergeSource(varDeclarations);
+
+ if (asObject) {
+ params.push(source);
+
+ return Function.apply(this, params);
+ } else {
+ return 'function(' + params.join(',') + ') {\n ' + source + '}';
+ }
+ },
+ mergeSource: function(varDeclarations) {
+ var source = '',
+ buffer,
+ appendOnly = !this.forceBuffer,
+ appendFirst;
+
+ for (var i = 0, len = this.source.length; i < len; i++) {
+ var line = this.source[i];
+ if (line.appendToBuffer) {
+ if (buffer) {
+ buffer = buffer + '\n + ' + line.content;
+ } else {
+ buffer = line.content;
+ }
+ } else {
+ if (buffer) {
+ if (!source) {
+ appendFirst = true;
+ source = buffer + ';\n ';
+ } else {
+ source += 'buffer += ' + buffer + ';\n ';
+ }
+ buffer = undefined;
+ }
+ source += line + '\n ';
+
+ if (!this.environment.isSimple) {
+ appendOnly = false;
+ }
+ }
+ }
+
+ if (appendOnly) {
+ if (buffer || !source) {
+ source += 'return ' + (buffer || '""') + ';\n';
+ }
+ } else {
+ varDeclarations += ", buffer = " + (appendFirst ? '' : this.initializeBuffer());
+ if (buffer) {
+ source += 'return buffer + ' + buffer + ';\n';
+ } else {
+ source += 'return buffer;\n';
+ }
+ }
+
+ if (varDeclarations) {
+ source = 'var ' + varDeclarations.substring(2) + (appendFirst ? '' : ';\n ') + source;
+ }
+
+ return source;
+ },
+
+ // [blockValue]
+ //
+ // On stack, before: hash, inverse, program, value
+ // On stack, after: return value of blockHelperMissing
+ //
+ // The purpose of this opcode is to take a block of the form
+ // `{{#this.foo}}...{{/this.foo}}`, resolve the value of `foo`, and
+ // replace it on the stack with the result of properly
+ // invoking blockHelperMissing.
+ blockValue: function(name) {
+ this.aliases.blockHelperMissing = 'helpers.blockHelperMissing';
+
+ var params = [this.contextName(0)];
+ this.setupParams(name, 0, params);
+
+ var blockName = this.popStack();
+ params.splice(1, 0, blockName);
+
+ this.push('blockHelperMissing.call(' + params.join(', ') + ')');
+ },
+
+ // [ambiguousBlockValue]
+ //
+ // On stack, before: hash, inverse, program, value
+ // Compiler value, before: lastHelper=value of last found helper, if any
+ // On stack, after, if no lastHelper: same as [blockValue]
+ // On stack, after, if lastHelper: value
+ ambiguousBlockValue: function() {
+ this.aliases.blockHelperMissing = 'helpers.blockHelperMissing';
+
+ // We're being a bit cheeky and reusing the options value from the prior exec
+ var params = [this.contextName(0)];
+ this.setupParams('', 0, params, true);
+
+ this.flushInline();
+
+ var current = this.topStack();
+ params.splice(1, 0, current);
+
+ this.pushSource("if (!" + this.lastHelper + ") { " + current + " = blockHelperMissing.call(" + params.join(", ") + "); }");
+ },
+
+ // [appendContent]
+ //
+ // On stack, before: ...
+ // On stack, after: ...
+ //
+ // Appends the string value of `content` to the current buffer
+ appendContent: function(content) {
+ if (this.pendingContent) {
+ content = this.pendingContent + content;
+ }
+
+ this.pendingContent = content;
+ },
+
+ // [append]
+ //
+ // On stack, before: value, ...
+ // On stack, after: ...
+ //
+ // Coerces `value` to a String and appends it to the current buffer.
+ //
+ // If `value` is truthy, or 0, it is coerced into a string and appended
+ // Otherwise, the empty string is appended
+ append: function() {
+ // Force anything that is inlined onto the stack so we don't have duplication
+ // when we examine local
+ this.flushInline();
+ var local = this.popStack();
+ this.pushSource('if (' + local + ' != null) { ' + this.appendToBuffer(local) + ' }');
+ if (this.environment.isSimple) {
+ this.pushSource("else { " + this.appendToBuffer("''") + " }");
+ }
+ },
+
+ // [appendEscaped]
+ //
+ // On stack, before: value, ...
+ // On stack, after: ...
+ //
+ // Escape `value` and append it to the buffer
+ appendEscaped: function() {
+ this.aliases.escapeExpression = 'this.escapeExpression';
+
+ this.pushSource(this.appendToBuffer("escapeExpression(" + this.popStack() + ")"));
+ },
+
+ // [getContext]
+ //
+ // On stack, before: ...
+ // On stack, after: ...
+ // Compiler value, after: lastContext=depth
+ //
+ // Set the value of the `lastContext` compiler value to the depth
+ getContext: function(depth) {
+ this.lastContext = depth;
+ },
+
+ // [pushContext]
+ //
+ // On stack, before: ...
+ // On stack, after: currentContext, ...
+ //
+ // Pushes the value of the current context onto the stack.
+ pushContext: function() {
+ this.pushStackLiteral(this.contextName(this.lastContext));
+ },
+
+ // [lookupOnContext]
+ //
+ // On stack, before: ...
+ // On stack, after: currentContext[name], ...
+ //
+ // Looks up the value of `name` on the current context and pushes
+ // it onto the stack.
+ lookupOnContext: function(parts, falsy, scoped) {
+ /*jshint -W083 */
+ var i = 0,
+ len = parts.length;
+
+ if (!scoped && this.options.compat && !this.lastContext) {
+ // The depthed query is expected to handle the undefined logic for the root level that
+ // is implemented below, so we evaluate that directly in compat mode
+ this.push(this.depthedLookup(parts[i++]));
+ } else {
+ this.pushContext();
+ }
+
+ for (; i < len; i++) {
+ this.replaceStack(function(current) {
+ var lookup = this.nameLookup(current, parts[i], 'context');
+ // We want to ensure that zero and false are handled properly if the context (falsy flag)
+ // needs to have the special handling for these values.
+ if (!falsy) {
+ return ' != null ? ' + lookup + ' : ' + current;
+ } else {
+ // Otherwise we can use generic falsy handling
+ return ' && ' + lookup;
+ }
+ });
+ }
+ },
+
+ // [lookupData]
+ //
+ // On stack, before: ...
+ // On stack, after: data, ...
+ //
+ // Push the data lookup operator
+ lookupData: function(depth, parts) {
+ /*jshint -W083 */
+ if (!depth) {
+ this.pushStackLiteral('data');
+ } else {
+ this.pushStackLiteral('this.data(data, ' + depth + ')');
+ }
+
+ var len = parts.length;
+ for (var i = 0; i < len; i++) {
+ this.replaceStack(function(current) {
+ return ' && ' + this.nameLookup(current, parts[i], 'data');
+ });
+ }
+ },
+
+ // [resolvePossibleLambda]
+ //
+ // On stack, before: value, ...
+ // On stack, after: resolved value, ...
+ //
+ // If the `value` is a lambda, replace it on the stack by
+ // the return value of the lambda
+ resolvePossibleLambda: function() {
+ this.aliases.lambda = 'this.lambda';
+
+ this.push('lambda(' + this.popStack() + ', ' + this.contextName(0) + ')');
+ },
+
+ // [pushStringParam]
+ //
+ // On stack, before: ...
+ // On stack, after: string, currentContext, ...
+ //
+ // This opcode is designed for use in string mode, which
+ // provides the string value of a parameter along with its
+ // depth rather than resolving it immediately.
+ pushStringParam: function(string, type) {
+ this.pushContext();
+ this.pushString(type);
+
+ // If it's a subexpression, the string result
+ // will be pushed after this opcode.
+ if (type !== 'sexpr') {
+ if (typeof string === 'string') {
+ this.pushString(string);
+ } else {
+ this.pushStackLiteral(string);
+ }
+ }
+ },
+
+ emptyHash: function() {
+ this.pushStackLiteral('{}');
+
+ if (this.trackIds) {
+ this.push('{}'); // hashIds
+ }
+ if (this.stringParams) {
+ this.push('{}'); // hashContexts
+ this.push('{}'); // hashTypes
+ }
+ },
+ pushHash: function() {
+ if (this.hash) {
+ this.hashes.push(this.hash);
+ }
+ this.hash = {values: [], types: [], contexts: [], ids: []};
+ },
+ popHash: function() {
+ var hash = this.hash;
+ this.hash = this.hashes.pop();
+
+ if (this.trackIds) {
+ this.push('{' + hash.ids.join(',') + '}');
+ }
+ if (this.stringParams) {
+ this.push('{' + hash.contexts.join(',') + '}');
+ this.push('{' + hash.types.join(',') + '}');
+ }
+
+ this.push('{\n ' + hash.values.join(',\n ') + '\n }');
+ },
+
+ // [pushString]
+ //
+ // On stack, before: ...
+ // On stack, after: quotedString(string), ...
+ //
+ // Push a quoted version of `string` onto the stack
+ pushString: function(string) {
+ this.pushStackLiteral(this.quotedString(string));
+ },
+
+ // [push]
+ //
+ // On stack, before: ...
+ // On stack, after: expr, ...
+ //
+ // Push an expression onto the stack
+ push: function(expr) {
+ this.inlineStack.push(expr);
+ return expr;
+ },
+
+ // [pushLiteral]
+ //
+ // On stack, before: ...
+ // On stack, after: value, ...
+ //
+ // Pushes a value onto the stack. This operation prevents
+ // the compiler from creating a temporary variable to hold
+ // it.
+ pushLiteral: function(value) {
+ this.pushStackLiteral(value);
+ },
+
+ // [pushProgram]
+ //
+ // On stack, before: ...
+ // On stack, after: program(guid), ...
+ //
+ // Push a program expression onto the stack. This takes
+ // a compile-time guid and converts it into a runtime-accessible
+ // expression.
+ pushProgram: function(guid) {
+ if (guid != null) {
+ this.pushStackLiteral(this.programExpression(guid));
+ } else {
+ this.pushStackLiteral(null);
+ }
+ },
+
+ // [invokeHelper]
+ //
+ // On stack, before: hash, inverse, program, params..., ...
+ // On stack, after: result of helper invocation
+ //
+ // Pops off the helper's parameters, invokes the helper,
+ // and pushes the helper's return value onto the stack.
+ //
+ // If the helper is not found, `helperMissing` is called.
+ invokeHelper: function(paramSize, name, isSimple) {
+ this.aliases.helperMissing = 'helpers.helperMissing';
+
+ var nonHelper = this.popStack();
+ var helper = this.setupHelper(paramSize, name);
+
+ var lookup = (isSimple ? helper.name + ' || ' : '') + nonHelper + ' || helperMissing';
+ this.push('((' + lookup + ').call(' + helper.callParams + '))');
+ },
+
+ // [invokeKnownHelper]
+ //
+ // On stack, before: hash, inverse, program, params..., ...
+ // On stack, after: result of helper invocation
+ //
+ // This operation is used when the helper is known to exist,
+ // so a `helperMissing` fallback is not required.
+ invokeKnownHelper: function(paramSize, name) {
+ var helper = this.setupHelper(paramSize, name);
+ this.push(helper.name + ".call(" + helper.callParams + ")");
+ },
+
+ // [invokeAmbiguous]
+ //
+ // On stack, before: hash, inverse, program, params..., ...
+ // On stack, after: result of disambiguation
+ //
+ // This operation is used when an expression like `{{foo}}`
+ // is provided, but we don't know at compile-time whether it
+ // is a helper or a path.
+ //
+ // This operation emits more code than the other options,
+ // and can be avoided by passing the `knownHelpers` and
+ // `knownHelpersOnly` flags at compile-time.
+ invokeAmbiguous: function(name, helperCall) {
+ this.aliases.functionType = '"function"';
+ this.aliases.helperMissing = 'helpers.helperMissing';
+ this.useRegister('helper');
+
+ var nonHelper = this.popStack();
+
+ this.emptyHash();
+ var helper = this.setupHelper(0, name, helperCall);
+
+ var helperName = this.lastHelper = this.nameLookup('helpers', name, 'helper');
+
+ this.push(
+ '((helper = (helper = ' + helperName + ' || ' + nonHelper + ') != null ? helper : helperMissing'
+ + (helper.paramsInit ? '),(' + helper.paramsInit : '') + '),'
+ + '(typeof helper === functionType ? helper.call(' + helper.callParams + ') : helper))');
+ },
+
+ // [invokePartial]
+ //
+ // On stack, before: context, ...
+ // On stack after: result of partial invocation
+ //
+ // This operation pops off a context, invokes a partial with that context,
+ // and pushes the result of the invocation back.
+ invokePartial: function(name, indent) {
+ var params = [this.nameLookup('partials', name, 'partial'), "'" + indent + "'", "'" + name + "'", this.popStack(), this.popStack(), "helpers", "partials"];
+
+ if (this.options.data) {
+ params.push("data");
+ } else if (this.options.compat) {
+ params.push('undefined');
+ }
+ if (this.options.compat) {
+ params.push('depths');
+ }
+
+ this.push("this.invokePartial(" + params.join(", ") + ")");
+ },
+
+ // [assignToHash]
+ //
+ // On stack, before: value, ..., hash, ...
+ // On stack, after: ..., hash, ...
+ //
+ // Pops a value off the stack and assigns it to the current hash
+ assignToHash: function(key) {
+ var value = this.popStack(),
+ context,
+ type,
+ id;
+
+ if (this.trackIds) {
+ id = this.popStack();
+ }
+ if (this.stringParams) {
+ type = this.popStack();
+ context = this.popStack();
+ }
+
+ var hash = this.hash;
+ if (context) {
+ hash.contexts.push("'" + key + "': " + context);
+ }
+ if (type) {
+ hash.types.push("'" + key + "': " + type);
+ }
+ if (id) {
+ hash.ids.push("'" + key + "': " + id);
+ }
+ hash.values.push("'" + key + "': (" + value + ")");
+ },
+
+ pushId: function(type, name) {
+ if (type === 'ID' || type === 'DATA') {
+ this.pushString(name);
+ } else if (type === 'sexpr') {
+ this.pushStackLiteral('true');
+ } else {
+ this.pushStackLiteral('null');
+ }
+ },
+
+ // 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();
+
+ var index = this.matchExistingProgram(child);
+
+ if (index == null) {
+ this.context.programs.push(''); // Placeholder to prevent name conflicts for nested children
+ index = this.context.programs.length;
+ child.index = index;
+ child.name = 'program' + index;
+ this.context.programs[index] = compiler.compile(child, options, this.context, !this.precompile);
+ this.context.environments[index] = child;
+
+ this.useDepths = this.useDepths || compiler.useDepths;
+ } else {
+ child.index = index;
+ child.name = 'program' + index;
+ }
+ }
+ },
+ matchExistingProgram: function(child) {
+ for (var i = 0, len = this.context.environments.length; i < len; i++) {
+ var environment = this.context.environments[i];
+ if (environment && environment.equals(child)) {
+ return i;
+ }
+ }
+ },
+
+ programExpression: function(guid) {
+ var child = this.environment.children[guid],
+ depths = child.depths.list,
+ useDepths = this.useDepths,
+ depth;
+
+ var programParams = [child.index, 'data'];
+
+ if (useDepths) {
+ programParams.push('depths');
+ }
+
+ return 'this.program(' + programParams.join(', ') + ')';
+ },
+
+ useRegister: function(name) {
+ if(!this.registers[name]) {
+ this.registers[name] = true;
+ this.registers.list.push(name);
+ }
+ },
+
+ pushStackLiteral: function(item) {
+ return this.push(new Literal(item));
+ },
+
+ pushSource: function(source) {
+ if (this.pendingContent) {
+ this.source.push(this.appendToBuffer(this.quotedString(this.pendingContent)));
+ this.pendingContent = undefined;
+ }
+
+ if (source) {
+ this.source.push(source);
+ }
+ },
+
+ pushStack: function(item) {
+ this.flushInline();
+
+ var stack = this.incrStack();
+ this.pushSource(stack + " = " + item + ";");
+ this.compileStack.push(stack);
+ return stack;
+ },
+
+ replaceStack: function(callback) {
+ var prefix = '',
+ inline = this.isInline(),
+ stack,
+ createdStack,
+ usedLiteral;
+
+ /* istanbul ignore next */
+ if (!this.isInline()) {
+ throw new Exception('replaceStack on non-inline');
+ }
+
+ // We want to merge the inline statement into the replacement statement via ','
+ var top = this.popStack(true);
+
+ if (top instanceof Literal) {
+ // Literals do not need to be inlined
+ prefix = stack = top.value;
+ usedLiteral = true;
+ } else {
+ // Get or create the current stack name for use by the inline
+ createdStack = !this.stackSlot;
+ var name = !createdStack ? this.topStackName() : this.incrStack();
+
+ prefix = '(' + this.push(name) + ' = ' + top + ')';
+ stack = this.topStack();
+ }
+
+ var item = callback.call(this, stack);
+
+ if (!usedLiteral) {
+ this.popStack();
+ }
+ if (createdStack) {
+ this.stackSlot--;
+ }
+ this.push('(' + prefix + item + ')');
+ },
+
+ incrStack: function() {
+ this.stackSlot++;
+ if(this.stackSlot > this.stackVars.length) { this.stackVars.push("stack" + this.stackSlot); }
+ return this.topStackName();
+ },
+ topStackName: function() {
+ return "stack" + this.stackSlot;
+ },
+ flushInline: function() {
+ var inlineStack = this.inlineStack;
+ if (inlineStack.length) {
+ this.inlineStack = [];
+ for (var i = 0, len = inlineStack.length; i < len; i++) {
+ var entry = inlineStack[i];
+ if (entry instanceof Literal) {
+ this.compileStack.push(entry);
+ } else {
+ this.pushStack(entry);
+ }
+ }
+ }
+ },
+ isInline: function() {
+ return this.inlineStack.length;
+ },
+
+ popStack: function(wrapped) {
+ var inline = this.isInline(),
+ item = (inline ? this.inlineStack : this.compileStack).pop();
+
+ if (!wrapped && (item instanceof Literal)) {
+ return item.value;
+ } else {
+ if (!inline) {
+ /* istanbul ignore next */
+ if (!this.stackSlot) {
+ throw new Exception('Invalid stack pop');
+ }
+ this.stackSlot--;
+ }
+ return item;
+ }
+ },
+
+ topStack: function() {
+ var stack = (this.isInline() ? this.inlineStack : this.compileStack),
+ item = stack[stack.length - 1];
+
+ if (item instanceof Literal) {
+ return item.value;
+ } else {
+ return item;
+ }
+ },
+
+ contextName: function(context) {
+ if (this.useDepths && context) {
+ return 'depths[' + context + ']';
+ } else {
+ return 'depth' + context;
+ }
+ },
+
+ quotedString: function(str) {
+ return '"' + str
+ .replace(/\\/g, '\\\\')
+ .replace(/"/g, '\\"')
+ .replace(/\n/g, '\\n')
+ .replace(/\r/g, '\\r')
+ .replace(/\u2028/g, '\\u2028') // Per Ecma-262 7.3 + 7.8.4
+ .replace(/\u2029/g, '\\u2029') + '"';
+ },
+
+ objectLiteral: function(obj) {
+ var pairs = [];
+
+ for (var key in obj) {
+ if (obj.hasOwnProperty(key)) {
+ pairs.push(this.quotedString(key) + ':' + obj[key]);
+ }
+ }
+
+ return '{' + pairs.join(',') + '}';
+ },
+
+ setupHelper: function(paramSize, name, blockHelper) {
+ var params = [],
+ paramsInit = this.setupParams(name, paramSize, params, blockHelper);
+ var foundHelper = this.nameLookup('helpers', name, 'helper');
+
+ return {
+ params: params,
+ paramsInit: paramsInit,
+ name: foundHelper,
+ callParams: [this.contextName(0)].concat(params).join(", ")
+ };
+ },
+
+ setupOptions: function(helper, paramSize, params) {
+ var options = {}, contexts = [], types = [], ids = [], param, inverse, program;
+
+ options.name = this.quotedString(helper);
+ options.hash = this.popStack();
+
+ if (this.trackIds) {
+ options.hashIds = this.popStack();
+ }
+ if (this.stringParams) {
+ options.hashTypes = this.popStack();
+ options.hashContexts = this.popStack();
+ }
+
+ inverse = this.popStack();
+ program = this.popStack();
+
+ // Avoid setting fn and inverse if neither are set. This allows
+ // helpers to do a check for `if (options.fn)`
+ if (program || inverse) {
+ if (!program) {
+ program = 'this.noop';
+ }
+
+ if (!inverse) {
+ inverse = 'this.noop';
+ }
+
+ options.fn = program;
+ options.inverse = inverse;
+ }
+
+ // The parameters go on to the stack in order (making sure that they are evaluated in order)
+ // so we need to pop them off the stack in reverse order
+ var i = paramSize;
+ while (i--) {
+ param = this.popStack();
+ params[i] = param;
+
+ if (this.trackIds) {
+ ids[i] = this.popStack();
+ }
+ if (this.stringParams) {
+ types[i] = this.popStack();
+ contexts[i] = this.popStack();
+ }
+ }
+
+ if (this.trackIds) {
+ options.ids = "[" + ids.join(",") + "]";
+ }
+ if (this.stringParams) {
+ options.types = "[" + types.join(",") + "]";
+ options.contexts = "[" + contexts.join(",") + "]";
+ }
+
+ if (this.options.data) {
+ options.data = "data";
+ }
+
+ return options;
+ },
+
+ // the params and contexts arguments are passed in arrays
+ // to fill in
+ setupParams: function(helperName, paramSize, params, useRegister) {
+ var options = this.objectLiteral(this.setupOptions(helperName, paramSize, params));
+
+ if (useRegister) {
+ this.useRegister('options');
+ params.push('options');
+ return 'options=' + options;
+ } else {
+ params.push(options);
+ return '';
+ }
+ }
+};
+
+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) {
+ return !JavaScriptCompiler.RESERVED_WORDS[name] && /^[a-zA-Z_$][0-9a-zA-Z_$]*$/.test(name);
+};
+
+export default JavaScriptCompiler;