import { COMPILER_REVISION, REVISION_CHANGES } from '../base';
import Exception from '../exception';
import { isArray } from '../utils';
import CodeGen from './code-gen';
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 */) {
return this.internalNameLookup(parent, name);
},
depthedLookup: function(name) {
return [
this.aliasable('container.lookup'),
'(depths, ',
JSON.stringify(name),
')'
];
},
compilerInfo: function() {
const revision = COMPILER_REVISION,
versions = REVISION_CHANGES[revision];
return [revision, versions];
},
appendToBuffer: function(source, location, explicit) {
// Force a source as this simplifies the merge logic.
if (!isArray(source)) {
source = [source];
}
source = this.source.wrap(source, location);
if (this.environment.isSimple) {
return ['return ', source, ';'];
} else if (explicit) {
// This is a case where the buffer operation occurs as a child of another
// construct, generally braces. We have to explicitly output these buffer
// operations to ensure that the emitted code goes in the correct location.
return ['buffer += ', source, ';'];
} else {
source.appendToBuffer = true;
return source;
}
},
initializeBuffer: function() {
return this.quotedString('');
},
// END PUBLIC API
internalNameLookup: function(parent, name) {
this.lookupPropertyFunctionIsUsed = true;
return ['lookupProperty(', parent, ',', JSON.stringify(name), ')'];
},
lookupPropertyFunctionIsUsed: false,
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 || {
decorators: [],
programs: [],
environments: []
};
this.preamble();
this.stackSlot = 0;
this.stackVars = [];
this.aliases = {};
this.registers = { list: [] };
this.hashes = [];
this.compileStack = [];
this.inlineStack = [];
this.blockParams = [];
this.compileChildren(environment, options);
this.useDepths =
this.useDepths ||
environment.useDepths ||
environment.useDecorators ||
this.options.compat;
this.useBlockParams = this.useBlockParams || environment.useBlockParams;
let opcodes = environment.opcodes,
opcode,
firstLoc,
i,
l;
for (i = 0, l = opcodes.length; i < l; i++) {
opcode = opcodes[i];
this.source.currentLocation = opcode.loc;
firstLoc = firstLoc || opcode.loc;
this[opcode.opcode].apply(this, opcode.args);
}
// Flush any trailing content that might be pending.
this.source.currentLocation = firstLoc;
this.pushSource('');
/* istanbul ignore next */
if (this.stackSlot || this.inlineStack.length || this.compileStack.length) {
throw new Exception('Compile completed with content left on stack');
}
if (!this.decorators.isEmpty()) {
this.useDecorators = true;
this.decorators.prepend([
'var decorators = container.decorators, ',
this.lookupPropertyFunctionVarDeclaration(),
';\n'
]);
this.decorators.push('return fn;');
if (asObject) {
this.decorators = Function.apply(this, [
'fn',
'props',
'container',
'depth0',
'data',
'blockParams',
'depths',
this.decorators.merge()
]);
} else {
this.decorators.prepend(
'function(fn, props, container, depth0, data, blockParams, depths) {\n'
);
this.decorators.push('}\n');
this.decorators = this.decorators.merge();
}
} else {
this.decorators = undefined;
}
let fn = this.createFunctionContext(asObject);
if (!this.isChild) {
let ret = {
compiler: this.compilerInfo(),
main: fn
};
if (this.decorators) {
ret.main_d = this.decorators; // eslint-disable-line camelcase
ret.useDecorators = true;
}
let { programs, decorators } = this.context;
for (i = 0, l = programs.length; i < l; i++) {
if (programs[i]) {
ret[i] = programs[i];
if (decorators[i]) {
ret[i + '_d'] = decorators[i];
ret.useDecorators = true;
}
}
}
if (this.environment.usePartial) {
ret.usePartial = true;
}
if (this.options.data) {
ret.useData = true;
}
if (this.useDepths) {
ret.useDepths = true;
}
if (this.useBlockParams) {
ret.useBlockParams = true;
}
if (this.options.compat) {
ret.compat = true;
}
if (!asObject) {
ret.compiler = JSON.stringify(ret.compiler);
this.source.currentLocation = { start: { line: 1, column: 0 } };
ret = this.objectLiteral(ret);
if (options.srcName) {
ret = ret.toStringWithSourceMap({ file: options.destName });
ret.map = ret.map && ret.map.toString();
} else {
ret = ret.toString();
}
} else {
ret.compilerOptions = this.options;
}
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 = new CodeGen(this.options.srcName);
this.decorators = new CodeGen(this.options.srcName);
},
createFunctionContext: function(asObject) {
let varDeclarations = '';
let locals = this.stackVars.concat(this.registers.list);
if (locals.length > 0) {
varDeclarations += ', ' + locals.join(', ');
}
// Generate minimizer alias mappings
//
// When using true SourceNodes, this will update all references to the given alias
// as the source nodes are reused in situ. For the non-source node compilation mode,
// aliases will not be used, but this case is already being run on the client and
// we aren't concern about minimizing the template size.
let aliasCount = 0;
Object.keys(this.aliases).forEach(alias => {
let node = this.aliases[alias];
if (node.children && node.referenceCount > 1) {
varDeclarations += ', alias' + ++aliasCount + '=' + alias;
node.children[0] = 'alias' + aliasCount;
}
});
if (this.lookupPropertyFunctionIsUsed) {
varDeclarations += ', ' + this.lookupPropertyFunctionVarDeclaration();
}
let params = ['container', 'depth0', 'helpers', 'partials', 'data'];
if (this.useBlockParams || this.useDepths) {
params.push('blockParams');
}
if (this.useDepths) {
params.push('depths');
}
// Perform a second pass over the output to merge content when possible
let source = this.mergeSource(varDeclarations);
if (asObject) {
params.push(source);
return Function.apply(this, params);
} else {
return this.source.wrap([
'function(',
params.join(','),
') {\n ',
source,
'}'
]);
}
},
mergeSource: function(varDeclarations) {
let isSimple = this.environment.isSimple,
appendOnly = !this.forceBuffer,
appendFirst,
sourceSeen,
bufferStart,
bufferEnd;
this.source.each(line => {
if (line.appendToBuffer) {
if (bufferStart) {
line.prepend(' + ');
} else {
bufferStart = line;
}
bufferEnd = line;
} else {
if (bufferStart) {
if (!sourceSeen) {
appendFirst = true;
} else {
bufferStart.prepend('buffer += ');
}
bufferEnd.add(';');
bufferStart = bufferEnd = undefined;
}
sourceSeen = true;
if (!isSimple) {
appendOnly = false;
}
}
});
if (appendOnly) {
if (bufferStart) {
bufferStart.prepend('return ');
bufferEnd.add(';');
} else if (!sourceSeen) {
this.source.push('return "";');
}
} else {
varDeclarations +=
', buffer = ' + (appendFirst ? '' : this.initializeBuffer());
if (bufferStart) {
bufferStart.prepend('return buffer + ');
bufferEnd.add(';');
} else {
this.source.push('return buffer;');
}
}
if (varDeclarations) {
this.source.prepend(
'var ' + varDeclarations.substring(2) + (appendFirst ? '' : ';\n')
);
}
return this.source.merge();
},
lookupPropertyFunctionVarDeclaration: function() {
return `
lookupProperty = container.lookupProperty || function(parent, propertyName) {
if (Object.prototype.hasOwnProperty.call(parent, propertyName)) {
return parent[propertyName];
}
return undefined
}
`.trim();
},
// [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) {
let blockHelperMissing = this.aliasable(
'container.hooks.blockHelperMissing'
),
params = [this.contextName(0)];
this.setupHelperArgs(name, 0, params);
let blockName = this.popStack();
params.splice(1, 0, blockName);
this.push(this.source.functionCall(blockHelperMissing, 'call', params));
},
// [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() {
// We're being a bit cheeky and reusing the options value from the prior exec
let blockHelperMissing = this.aliasable(
'container.hooks.blockHelperMissing'
),
params = [this.contextName(0)];
this.setupHelperArgs('', 0, params, true);
this.flushInline();
let current = this.topStack();
params.splice(1, 0, current);
this.pushSource([
'if (!',
this.lastHelper,
') { ',
current,
' = ',
this.source.functionCall(blockHelperMissing, 'call', params),
'}'
]);
},
// [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;
} else {
this.pendingLocation = this.source.currentLocation;
}
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() {
if (this.isInline()) {
this.replaceStack(current => [' != null ? ', current, ' : ""']);
this.pushSource(this.appendToBuffer(this.popStack()));
} else {
let local = this.popStack();
this.pushSource([
'if (',
local,
' != null) { ',
this.appendToBuffer(local, undefined, true),
' }'
]);
if (this.environment.isSimple) {
this.pushSource([
'else { ',
this.appendToBuffer("''", undefined, true),
' }'
]);
}
}
},
// [appendEscaped]
//
// On stack, before: value, ...
// On stack, after: ...
//
// Escape `value` and append it to the buffer
appendEscaped: function() {
this.pushSource(
this.appendToBuffer([
this.aliasable('container.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, strict, scoped) {
let i = 0;
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();
}
this.resolvePath('context', parts, i, falsy, strict);
},
// [lookupBlockParam]
//
// On stack, before: ...
// On stack, after: blockParam[name], ...
//
// Looks up the value of `parts` on the given block param and pushes
// it onto the stack.
lookupBlockParam: function(blockParamId, parts) {
this.useBlockParams = true;
this.push(['blockParams[', blockParamId[0], '][', blockParamId[1], ']']);
this.resolvePath('context', parts, 1);
},
// [lookupData]
//
// On stack, before: ...
// On stack, after: data, ...
//
// Push the data lookup operator
lookupData: function(depth, parts, strict) {
if (!depth) {
this.pushStackLiteral('data');
} else {
this.pushStackLiteral('container.data(data, ' + depth + ')');
}
this.resolvePath('data', parts, 0, true, strict);
},
resolvePath: function(type, parts, i, falsy, strict) {
if (this.options.strict || this.options.assumeObjects) {
this.push(strictLookup(this.options.strict && strict, this, parts, type));
return;
}
let len = parts.length;
for (; i < len; i++) {
/* eslint-disable no-loop-func */
this.replaceStack(current => {
let lookup = this.nameLookup(current, parts[i], type);
// 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];
}
});
/* eslint-enable no-loop-func */
}
},
// [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.push([
this.aliasable('container.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 !== 'SubExpression') {
if (typeof string === 'string') {
this.pushString(string);
} else {
this.pushStackLiteral(string);
}
}
},
emptyHash: function(omitEmpty) {
if (this.trackIds) {
this.push('{}'); // hashIds
}
if (this.stringParams) {
this.push('{}'); // hashContexts
this.push('{}'); // hashTypes
}
this.pushStackLiteral(omitEmpty ? 'undefined' : '{}');
},
pushHash: function() {
if (this.hash) {
this.hashes.push(this.hash);
}
this.hash = { values: {}, types: [], contexts: [], ids: [] };
},
popHash: function() {
let hash = this.hash;
this.hash = this.hashes.pop();
if (this.trackIds) {
this.push(this.objectLiteral(hash.ids));
}
if (this.stringParams) {
this.push(this.objectLiteral(hash.contexts));
this.push(this.objectLiteral(hash.types));
}
this.push(this.objectLiteral(hash.values));
},
// [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));
},
// [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);
}
},
// [registerDecorator]
//
// On stack, before: hash, program, params..., ...
// On stack, after: ...
//
// Pops off the decorator's parameters, invokes the decorator,
// and inserts the decorator into the decorators list.
registerDecorator(paramSize, name) {
let foundDecorator = this.nameLookup('decorators', name, 'decorator'),
options = this.setupHelperArgs(name, paramSize);
this.decorators.push([
'fn = ',
this.decorators.functionCall(foundDecorator, '', [
'fn',
'props',
'container',
options
]),
' || fn;'
]);
},
// [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) {
let nonHelper = this.popStack(),
helper = this.setupHelper(paramSize, name);
let possibleFunctionCalls = [];
if (isSimple) {
// direct call to helper
possibleFunctionCalls.push(helper.name);
}
// call a function from the input object
possibleFunctionCalls.push(nonHelper);
if (!this.options.strict) {
possibleFunctionCalls.push(
this.aliasable('container.hooks.helperMissing')
);
}
let functionLookupCode = [
'(',
this.itemsSeparatedBy(possibleFunctionCalls, '||'),
')'
];
let functionCall = this.source.functionCall(
functionLookupCode,
'call',
helper.callParams
);
this.push(functionCall);
},
itemsSeparatedBy: function(items, separator) {
let result = [];
result.push(items[0]);
for (let i = 1; i < items.length; i++) {
result.push(separator, items[i]);
}
return result;
},
// [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) {
let helper = this.setupHelper(paramSize, name);
this.push(this.source.functionCall(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.useRegister('helper');
let nonHelper = this.popStack();
this.emptyHash();
let helper = this.setupHelper(0, name, helperCall);
let helperName = (this.lastHelper = this.nameLookup(
'helpers',
name,
'helper'
));
let lookup = ['(', '(helper = ', helperName, ' || ', nonHelper, ')'];
if (!this.options.strict) {
lookup[0] = '(helper = ';
lookup.push(
' != null ? helper : ',
this.aliasable('container.hooks.helperMissing')
);
}
this.push([
'(',
lookup,
helper.paramsInit ? ['),(', helper.paramsInit] : [],
'),',
'(typeof helper === ',
this.aliasable('"function"'),
' ? ',
this.source.functionCall('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(isDynamic, name, indent) {
let params = [],
options = this.setupParams(name, 1, params);
if (isDynamic) {
name = this.popStack();
delete options.name;
}
if (indent) {
options.indent = JSON.stringify(indent);
}
options.helpers = 'helpers';
options.partials = 'partials';
options.decorators = 'container.decorators';
if (!isDynamic) {
params.unshift(this.nameLookup('partials', name, 'partial'));
} else {
params.unshift(name);
}
if (this.options.compat) {
options.depths = 'depths';
}
options = this.objectLiteral(options);
params.push(options);
this.push(this.source.functionCall('container.invokePartial', '', params));
},
// [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) {
let value = this.popStack(),
context,
type,
id;
if (this.trackIds) {
id = this.popStack();
}
if (this.stringParams) {
type = this.popStack();
context = this.popStack();
}
let hash = this.hash;
if (context) {
hash.contexts[key] = context;
}
if (type) {
hash.types[key] = type;
}
if (id) {
hash.ids[key] = id;
}
hash.values[key] = value;
},
pushId: function(type, name, child) {
if (type === 'BlockParam') {
this.pushStackLiteral(
'blockParams[' +
name[0] +
'].path[' +
name[1] +
']' +
(child ? ' + ' + JSON.stringify('.' + child) : '')
);
} else if (type === 'PathExpression') {
this.pushString(name);
} else if (type === 'SubExpression') {
this.pushStackLiteral('true');
} else {
this.pushStackLiteral('null');
}
},
// HELPERS
compiler: JavaScriptCompiler,
compileChildren: function(environment, options) {
let children = environment.children,
child,
compiler;
for (let i = 0, l = children.length; i < l; i++) {
child = children[i];
compiler = new this.compiler(); // eslint-disable-line new-cap
let existing = this.matchExistingProgram(child);
if (existing == null) {
this.context.programs.push(''); // Placeholder to prevent name conflicts for nested children
let 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.decorators[index] = compiler.decorators;
this.context.environments[index] = child;
this.useDepths = this.useDepths || compiler.useDepths;
this.useBlockParams = this.useBlockParams || compiler.useBlockParams;
child.useDepths = this.useDepths;
child.useBlockParams = this.useBlockParams;
} else {
child.index = existing.index;
child.name = 'program' + existing.index;
this.useDepths = this.useDepths || existing.useDepths;
this.useBlockParams = this.useBlockParams || existing.useBlockParams;
}
}
},
matchExistingProgram: function(child) {
for (let i = 0, len = this.context.environments.length; i < len; i++) {
let environment = this.context.environments[i];
if (environment && environment.equals(child)) {
return environment;
}
}
},
programExpression: function(guid) {
let child = this.environment.children[guid],
programParams = [child.index, 'data', child.blockParams];
if (this.useBlockParams || this.useDepths) {
programParams.push('blockParams');
}
if (this.useDepths) {
programParams.push('depths');
}
return 'container.program(' + programParams.join(', ') + ')';
},
useRegister: function(name) {
if (!this.registers[name]) {
this.registers[name] = true;
this.registers.list.push(name);
}
},
push: function(expr) {
if (!(expr instanceof Literal)) {
expr = this.source.wrap(expr);
}
this.inlineStack.push(expr);
return expr;
},
pushStackLiteral: function(item) {
this.push(new Literal(item));
},
pushSource: function(source) {
if (this.pendingContent) {
this.source.push(
this.appendToBuffer(
this.source.quotedString(this.pendingContent),
this.pendingLocation
)
);
this.pendingContent = undefined;
}
if (source) {
this.source.push(source);
}
},
replaceStack: function(callback) {
let prefix = ['('],
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 ','
let top = this.popStack(true);
if (top instanceof Literal) {
// Literals do not need to be inlined
stack = [top.value];
prefix = ['(', stack];
usedLiteral = true;
} else {
// Get or create the current stack name for use by the inline
createdStack = true;
let name = this.incrStack();
prefix = ['((', this.push(name), ' = ', top, ')'];
stack = this.topStack();
}
let item = callback.call(this, stack);
if (!usedLiteral) {
this.popStack();
}
if (createdStack) {
this.stackSlot--;
}
this.push(prefix.concat(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() {
let inlineStack = this.inlineStack;
this.inlineStack = [];
for (let i = 0, len = inlineStack.length; i < len; i++) {
let entry = inlineStack[i];
/* istanbul ignore if */
if (entry instanceof Literal) {
this.compileStack.push(entry);
} else {
let stack = this.incrStack();
this.pushSource([stack, ' = ', entry, ';']);
this.compileStack.push(stack);
}
}
},
isInline: function() {
return this.inlineStack.length;
},
popStack: function(wrapped) {
let 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() {
let stack = this.isInline() ? this.inlineStack : this.compileStack,
item = stack[stack.length - 1];
/* istanbul ignore if */
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 this.source.quotedString(str);
},
objectLiteral: function(obj) {
return this.source.objectLiteral(obj);
},
aliasable: function(name) {
let ret = this.aliases[name];
if (ret) {
ret.referenceCount++;
return ret;
}
ret = this.aliases[name] = this.source.wrap(name);
ret.aliasable = true;
ret.referenceCount = 1;
return ret;
},
setupHelper: function(paramSize, name, blockHelper) {
let params = [],
paramsInit = this.setupHelperArgs(name, paramSize, params, blockHelper);
let foundHelper = this.nameLookup('helpers', name, 'helper'),
callContext = this.aliasable(
`${this.contextName(0)} != null ? ${this.contextName(
0
)} : (container.nullContext || {})`
);
return {
params: params,
paramsInit: paramsInit,
name: foundHelper,
callParams: [callContext].concat(params)
};
},
setupParams: function(helper, paramSize, params) {
let options = {},
contexts = [],
types = [],
ids = [],
objectArgs = !params,
param;
if (objectArgs) {
params = [];
}
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();
}
let 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) {
options.fn = program || 'container.noop';
options.inverse = inverse || 'container.noop';
}
// 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
let 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 (objectArgs) {
options.args = this.source.generateArray(params);
}
if (this.trackIds) {
options.ids = this.source.generateArray(ids);
}
if (this.stringParams) {
options.types = this.source.generateArray(types);
options.contexts = this.source.generateArray(contexts);
}
if (this.options.data) {
options.data = 'data';
}
if (this.useBlockParams) {
options.blockParams = 'blockParams';
}
return options;
},
setupHelperArgs: function(helper, paramSize, params, useRegister) {
let options = this.setupParams(helper, paramSize, params);
options.loc = JSON.stringify(this.source.currentLocation);
options = this.objectLiteral(options);
if (useRegister) {
this.useRegister('options');
params.push('options');
return ['options=', options];
} else if (params) {
params.push(options);
return '';
} else {
return options;
}
}
};
(function() {
const 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 await' +
' null true false'
).split(' ');
const compilerWords = (JavaScriptCompiler.RESERVED_WORDS = {});
for (let i = 0, l = reservedWords.length; i < l; i++) {
compilerWords[reservedWords[i]] = true;
}
})();
/**
* @deprecated May be removed in the next major version
*/
JavaScriptCompiler.isValidJavaScriptVariableName = function(name) {
return (
!JavaScriptCompiler.RESERVED_WORDS[name] &&
/^[a-zA-Z_$][0-9a-zA-Z_$]*$/.test(name)
);
};
function strictLookup(requireTerminal, compiler, parts, type) {
let stack = compiler.popStack(),
i = 0,
len = parts.length;
if (requireTerminal) {
len--;
}
for (; i < len; i++) {
stack = compiler.nameLookup(stack, parts[i], type);
}
if (requireTerminal) {
return [
compiler.aliasable('container.strict'),
'(',
stack,
', ',
compiler.quotedString(parts[i]),
', ',
JSON.stringify(compiler.source.currentLocation),
' )'
];
} else {
return stack;
}
}
export default JavaScriptCompiler;
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