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import {
RootNode,
TemplateChildNode,
TextNode,
CommentNode,
ExpressionNode,
NodeTypes,
JSChildNode,
CallExpression,
ArrayExpression,
ObjectExpression,
Position,
InterpolationNode,
CompoundExpressionNode,
SimpleExpressionNode,
FunctionExpression,
ConditionalExpression,
CacheExpression,
locStub,
SSRCodegenNode,
TemplateLiteral,
IfStatement,
AssignmentExpression,
ReturnStatement,
VNodeCall,
SequenceExpression
} from './ast'
import { SourceMapGenerator, RawSourceMap } from 'source-map'
import {
advancePositionWithMutation,
assert,
getVNodeBlockHelper,
getVNodeHelper,
isSimpleIdentifier,
toValidAssetId
} from './utils'
import { isString, isArray, isSymbol } from '@vue/shared'
import {
helperNameMap,
TO_DISPLAY_STRING,
CREATE_VNODE,
RESOLVE_COMPONENT,
RESOLVE_DIRECTIVE,
SET_BLOCK_TRACKING,
CREATE_COMMENT,
CREATE_TEXT,
PUSH_SCOPE_ID,
POP_SCOPE_ID,
WITH_DIRECTIVES,
CREATE_ELEMENT_VNODE,
OPEN_BLOCK,
CREATE_STATIC,
WITH_CTX,
RESOLVE_FILTER
} from './runtimeHelpers'
import { ImportItem } from './transform'
const PURE_ANNOTATION = `/*#__PURE__*/`
const aliasHelper = (s: symbol) => `${helperNameMap[s]}: _${helperNameMap[s]}`
type CodegenNode = TemplateChildNode | JSChildNode | SSRCodegenNode
export interface CodegenResult {
code: string
preamble: string
ast: RootNode
map?: RawSourceMap
}
export interface CodegenContext
extends Omit<Required<CodegenOptions>, 'bindingMetadata' | 'inline'> {
source: string
code: string
line: number
column: number
offset: number
indentLevel: number
pure: boolean
map?: SourceMapGenerator
helper(key: symbol): string
push(code: string, node?: CodegenNode): void
indent(): void
deindent(withoutNewLine?: boolean): void
newline(): void
}
function createCodegenContext(
ast: RootNode,
{
mode = 'function',
prefixIdentifiers = mode === 'module',
sourceMap = false,
filename = `template.vue.html`,
scopeId = null,
optimizeImports = false,
runtimeGlobalName = `Vue`,
runtimeModuleName = `vue`,
ssrRuntimeModuleName = 'vue/server-renderer',
ssr = false,
isTS = false,
inSSR = false
}: CodegenOptions
): CodegenContext {
const context: CodegenContext = {
mode,
prefixIdentifiers,
sourceMap,
filename,
scopeId,
optimizeImports,
runtimeGlobalName,
runtimeModuleName,
ssrRuntimeModuleName,
ssr,
isTS,
inSSR,
source: ast.loc.source,
code: ``,
column: 1,
line: 1,
offset: 0,
indentLevel: 0,
pure: false,
map: undefined,
helper(key) {
return `_${helperNameMap[key]}`
},
push(code, node) {
context.code += code
if (!__BROWSER__ && context.map) {
if (node) {
let name
if (node.type === NodeTypes.SIMPLE_EXPRESSION && !node.isStatic) {
const content = node.content.replace(/^_ctx\./, '')
if (content !== node.content && isSimpleIdentifier(content)) {
name = content
}
}
addMapping(node.loc.start, name)
}
advancePositionWithMutation(context, code)
if (node && node.loc !== locStub) {
addMapping(node.loc.end)
}
}
},
indent() {
newline(++context.indentLevel)
},
deindent(withoutNewLine = false) {
if (withoutNewLine) {
--context.indentLevel
} else {
newline(--context.indentLevel)
}
},
newline() {
newline(context.indentLevel)
}
}
function newline(n: number) {
context.push('\n' + ` `.repeat(n))
}
function addMapping(loc: Position, name?: string) {
context.map!.addMapping({
name,
source: context.filename,
original: {
line: loc.line,
column: loc.column - 1 // source-map column is 0 based
},
generated: {
line: context.line,
column: context.column - 1
}
})
}
if (!__BROWSER__ && sourceMap) {
// lazy require source-map implementation, only in non-browser builds
context.map = new SourceMapGenerator()
context.map!.setSourceContent(filename, context.source)
}
return context
}
export function generate(
ast: RootNode,
options: CodegenOptions & {
onContextCreated?: (context: CodegenContext) => void
} = {}
): CodegenResult {
const context = createCodegenContext(ast, options)
Iif (options.onContextCreated) options.onContextCreated(context)
const {
mode,
push,
prefixIdentifiers,
indent,
deindent,
newline,
scopeId,
ssr
} = context
const hasHelpers = ast.helpers.length > 0
const useWithBlock = !prefixIdentifiers && mode !== 'module'
const genScopeId = !__BROWSER__ && scopeId != null && mode === 'module'
const isSetupInlined = !__BROWSER__ && !!options.inline
// preambles
// in setup() inline mode, the preamble is generated in a sub context
// and returned separately.
const preambleContext = isSetupInlined
? createCodegenContext(ast, options)
: context
if (!__BROWSER__ && mode === 'module') {
genModulePreamble(ast, preambleContext, genScopeId, isSetupInlined)
} else {
genFunctionPreamble(ast, preambleContext)
}
// enter render function
const functionName = ssr ? `ssrRender` : `render`
const args = ssr ? ['_ctx', '_push', '_parent', '_attrs'] : ['_ctx', '_cache']
if (!__BROWSER__ && options.bindingMetadata && !options.inline) {
// binding optimization args
args.push('$props', '$setup', '$data', '$options')
}
const signature =
!__BROWSER__ && options.isTS
? args.map(arg => `${arg}: any`).join(',')
: args.join(', ')
if (isSetupInlined) {
push(`(${signature}) => {`)
} else {
push(`function ${functionName}(${signature}) {`)
}
indent()
if (useWithBlock) {
push(`with (_ctx) {`)
indent()
// function mode const declarations should be inside with block
// also they should be renamed to avoid collision with user properties
if (hasHelpers) {
push(`const { ${ast.helpers.map(aliasHelper).join(', ')} } = _Vue`)
push(`\n`)
newline()
}
}
// generate asset resolution statements
if (ast.components.length) {
genAssets(ast.components, 'component', context)
if (ast.directives.length || ast.temps > 0) {
newline()
}
}
if (ast.directives.length) {
genAssets(ast.directives, 'directive', context)
if (ast.temps > 0) {
newline()
}
}
if (__COMPAT__ && ast.filters && ast.filters.length) {
newline()
genAssets(ast.filters, 'filter', context)
newline()
}
if (ast.temps > 0) {
push(`let `)
for (let i = 0; i < ast.temps; i++) {
push(`${i > 0 ? `, ` : ``}_temp${i}`)
}
}
if (ast.components.length || ast.directives.length || ast.temps) {
push(`\n`)
newline()
}
// generate the VNode tree expression
if (!ssr) {
push(`return `)
}
if (ast.codegenNode) {
genNode(ast.codegenNode, context)
} else {
push(`null`)
}
if (useWithBlock) {
deindent()
push(`}`)
}
deindent()
push(`}`)
return {
ast,
code: context.code,
preamble: isSetupInlined ? preambleContext.code : ``,
// SourceMapGenerator does have toJSON() method but it's not in the types
map: context.map ? (context.map as any).toJSON() : undefined
}
}
function genFunctionPreamble(ast: RootNode, context: CodegenContext) {
const {
ssr,
prefixIdentifiers,
push,
newline,
runtimeModuleName,
runtimeGlobalName,
ssrRuntimeModuleName
} = context
const VueBinding =
!__BROWSER__ && ssr
? `require(${JSON.stringify(runtimeModuleName)})`
: runtimeGlobalName
// Generate const declaration for helpers
// In prefix mode, we place the const declaration at top so it's done
// only once; But if we not prefixing, we place the declaration inside the
// with block so it doesn't incur the `in` check cost for every helper access.
if (ast.helpers.length > 0) {
if (!__BROWSER__ && prefixIdentifiers) {
push(
`const { ${ast.helpers.map(aliasHelper).join(', ')} } = ${VueBinding}\n`
)
} else {
// "with" mode.
// save Vue in a separate variable to avoid collision
push(`const _Vue = ${VueBinding}\n`)
// in "with" mode, helpers are declared inside the with block to avoid
// has check cost, but hoists are lifted out of the function - we need
// to provide the helper here.
if (ast.hoists.length) {
const staticHelpers = [
CREATE_VNODE,
CREATE_ELEMENT_VNODE,
CREATE_COMMENT,
CREATE_TEXT,
CREATE_STATIC
]
.filter(helper => ast.helpers.includes(helper))
.map(aliasHelper)
.join(', ')
push(`const { ${staticHelpers} } = _Vue\n`)
}
}
}
// generate variables for ssr helpers
if (!__BROWSER__ && ast.ssrHelpers && ast.ssrHelpers.length) {
// ssr guarantees prefixIdentifier: true
push(
`const { ${ast.ssrHelpers
.map(aliasHelper)
.join(', ')} } = require("${ssrRuntimeModuleName}")\n`
)
}
genHoists(ast.hoists, context)
newline()
push(`return `)
}
function genModulePreamble(
ast: RootNode,
context: CodegenContext,
genScopeId: boolean,
inline?: boolean
) {
const {
push,
newline,
optimizeImports,
runtimeModuleName,
ssrRuntimeModuleName
} = context
if (genScopeId && ast.hoists.length) {
ast.helpers.push(PUSH_SCOPE_ID, POP_SCOPE_ID)
}
// generate import statements for helpers
if (ast.helpers.length) {
if (optimizeImports) {
// when bundled with webpack with code-split, calling an import binding
// as a function leads to it being wrapped with `Object(a.b)` or `(0,a.b)`,
// incurring both payload size increase and potential perf overhead.
// therefore we assign the imports to variables (which is a constant ~50b
// cost per-component instead of scaling with template size)
push(
`import { ${ast.helpers
.map(s => helperNameMap[s])
.join(', ')} } from ${JSON.stringify(runtimeModuleName)}\n`
)
push(
`\n// Binding optimization for webpack code-split\nconst ${ast.helpers
.map(s => `_${helperNameMap[s]} = ${helperNameMap[s]}`)
.join(', ')}\n`
)
} else {
push(
`import { ${ast.helpers
.map(s => `${helperNameMap[s]} as _${helperNameMap[s]}`)
.join(', ')} } from ${JSON.stringify(runtimeModuleName)}\n`
)
}
}
if (ast.ssrHelpers && ast.ssrHelpers.length) {
push(
`import { ${ast.ssrHelpers
.map(s => `${helperNameMap[s]} as _${helperNameMap[s]}`)
.join(', ')} } from "${ssrRuntimeModuleName}"\n`
)
}
if (ast.imports.length) {
genImports(ast.imports, context)
newline()
}
genHoists(ast.hoists, context)
newline()
if (!inline) {
push(`export `)
}
}
function genAssets(
assets: string[],
type: 'component' | 'directive' | 'filter',
{ helper, push, newline, isTS }: CodegenContext
) {
const resolver = helper(
__COMPAT__ && type === 'filter'
? RESOLVE_FILTER
: type === 'component'
? RESOLVE_COMPONENT
: RESOLVE_DIRECTIVE
)
for (let i = 0; i < assets.length; i++) {
let id = assets[i]
// potential component implicit self-reference inferred from SFC filename
const maybeSelfReference = id.endsWith('__self')
if (maybeSelfReference) {
id = id.slice(0, -6)
}
push(
`const ${toValidAssetId(id, type)} = ${resolver}(${JSON.stringify(id)}${
maybeSelfReference ? `, true` : ``
})${isTS ? `!` : ``}`
)
if (i < assets.length - 1) {
newline()
}
}
}
function genHoists(hoists: (JSChildNode | null)[], context: CodegenContext) {
if (!hoists.length) {
return
}
context.pure = true
const { push, newline, helper, scopeId, mode } = context
const genScopeId = !__BROWSER__ && scopeId != null && mode !== 'function'
newline()
// generate inlined withScopeId helper
if (genScopeId) {
push(
`const _withScopeId = n => (${helper(
PUSH_SCOPE_ID
)}("${scopeId}"),n=n(),${helper(POP_SCOPE_ID)}(),n)`
)
newline()
}
for (let i = 0; i < hoists.length; i++) {
const exp = hoists[i]
if (exp) {
const needScopeIdWrapper = genScopeId && exp.type === NodeTypes.VNODE_CALL
push(
`const _hoisted_${i + 1} = ${
needScopeIdWrapper ? `${PURE_ANNOTATION} _withScopeId(() => ` : ``
}`
)
genNode(exp, context)
if (needScopeIdWrapper) {
push(`)`)
}
newline()
}
}
context.pure = false
}
function genImports(importsOptions: ImportItem[], context: CodegenContext) {
Iif (!importsOptions.length) {
return
}
importsOptions.forEach(imports => {
context.push(`import `)
genNode(imports.exp, context)
context.push(` from '${imports.path}'`)
context.newline()
})
}
function isText(n: string | CodegenNode) {
return (
isString(n) ||
n.type === NodeTypes.SIMPLE_EXPRESSION ||
n.type === NodeTypes.TEXT ||
n.type === NodeTypes.INTERPOLATION ||
n.type === NodeTypes.COMPOUND_EXPRESSION
)
}
function genNodeListAsArray(
nodes: (string | CodegenNode | TemplateChildNode[])[],
context: CodegenContext
) {
const multilines =
nodes.length > 3 ||
((!__BROWSER__ || __DEV__) && nodes.some(n => isArray(n) || !isText(n)))
context.push(`[`)
multilines && context.indent()
genNodeList(nodes, context, multilines)
multilines && context.deindent()
context.push(`]`)
}
function genNodeList(
nodes: (string | symbol | CodegenNode | TemplateChildNode[])[],
context: CodegenContext,
multilines: boolean = false,
comma: boolean = true
) {
const { push, newline } = context
for (let i = 0; i < nodes.length; i++) {
const node = nodes[i]
if (isString(node)) {
push(node)
} else if (isArray(node)) {
genNodeListAsArray(node, context)
} else {
genNode(node, context)
}
if (i < nodes.length - 1) {
if (multilines) {
comma && push(',')
newline()
} else {
comma && push(', ')
}
}
}
}
function genNode(node: CodegenNode | symbol | string, context: CodegenContext) {
Iif (isString(node)) {
context.push(node)
return
}
if (isSymbol(node)) {
context.push(context.helper(node))
return
}
switch (node.type) {
case NodeTypes.ELEMENT:
case NodeTypes.IF:
case NodeTypes.FOR:
__DEV__ &&
assert(
node.codegenNode != null,
`Codegen node is missing for element/if/for node. ` +
`Apply appropriate transforms first.`
)
genNode(node.codegenNode!, context)
break
case NodeTypes.TEXT:
genText(node, context)
break
case NodeTypes.SIMPLE_EXPRESSION:
genExpression(node, context)
break
case NodeTypes.INTERPOLATION:
genInterpolation(node, context)
break
case NodeTypes.TEXT_CALL:
genNode(node.codegenNode, context)
break
case NodeTypes.COMPOUND_EXPRESSION:
genCompoundExpression(node, context)
break
case NodeTypes.COMMENT:
genComment(node, context)
break
case NodeTypes.VNODE_CALL:
genVNodeCall(node, context)
break
case NodeTypes.JS_CALL_EXPRESSION:
genCallExpression(node, context)
break
case NodeTypes.JS_OBJECT_EXPRESSION:
genObjectExpression(node, context)
break
case NodeTypes.JS_ARRAY_EXPRESSION:
genArrayExpression(node, context)
break
case NodeTypes.JS_FUNCTION_EXPRESSION:
genFunctionExpression(node, context)
break
case NodeTypes.JS_CONDITIONAL_EXPRESSION:
genConditionalExpression(node, context)
break
case NodeTypes.JS_CACHE_EXPRESSION:
genCacheExpression(node, context)
break
case NodeTypes.JS_BLOCK_STATEMENT:
genNodeList(node.body, context, true, false)
break
// SSR only types
case NodeTypes.JS_TEMPLATE_LITERAL:
!__BROWSER__ && genTemplateLiteral(node, context)
break
case NodeTypes.JS_IF_STATEMENT:
!__BROWSER__ && genIfStatement(node, context)
break
case NodeTypes.JS_ASSIGNMENT_EXPRESSION:
!__BROWSER__ && genAssignmentExpression(node, context)
break
case NodeTypes.JS_SEQUENCE_EXPRESSION:
!__BROWSER__ && genSequenceExpression(node, context)
break
case NodeTypes.JS_RETURN_STATEMENT:
!__BROWSER__ && genReturnStatement(node, context)
break
/* istanbul ignore next */
case NodeTypes.IF_BRANCH:
// noop
break
default:
Iif (__DEV__) {
assert(false, `unhandled codegen node type: ${(node as any).type}`)
// make sure we exhaust all possible types
const exhaustiveCheck: never = node
return exhaustiveCheck
}
}
}
function genText(
node: TextNode | SimpleExpressionNode,
context: CodegenContext
) {
context.push(JSON.stringify(node.content), node)
}
function genExpression(node: SimpleExpressionNode, context: CodegenContext) {
const { content, isStatic } = node
context.push(isStatic ? JSON.stringify(content) : content, node)
}
function genInterpolation(node: InterpolationNode, context: CodegenContext) {
const { push, helper, pure } = context
if (pure) push(PURE_ANNOTATION)
push(`${helper(TO_DISPLAY_STRING)}(`)
genNode(node.content, context)
push(`)`)
}
function genCompoundExpression(
node: CompoundExpressionNode,
context: CodegenContext
) {
for (let i = 0; i < node.children!.length; i++) {
const child = node.children![i]
if (isString(child)) {
context.push(child)
} else {
genNode(child, context)
}
}
}
function genExpressionAsPropertyKey(
node: ExpressionNode,
context: CodegenContext
) {
const { push } = context
if (node.type === NodeTypes.COMPOUND_EXPRESSION) {
push(`[`)
genCompoundExpression(node, context)
push(`]`)
} else if (node.isStatic) {
// only quote keys if necessary
const text = isSimpleIdentifier(node.content)
? node.content
: JSON.stringify(node.content)
push(text, node)
} else {
push(`[${node.content}]`, node)
}
}
function genComment(node: CommentNode, context: CodegenContext) {
const { push, helper, pure } = context
if (pure) {
push(PURE_ANNOTATION)
}
push(`${helper(CREATE_COMMENT)}(${JSON.stringify(node.content)})`, node)
}
function genVNodeCall(node: VNodeCall, context: CodegenContext) {
const { push, helper, pure } = context
const {
tag,
props,
children,
patchFlag,
dynamicProps,
directives,
isBlock,
disableTracking,
isComponent
} = node
if (directives) {
push(helper(WITH_DIRECTIVES) + `(`)
}
if (isBlock) {
push(`(${helper(OPEN_BLOCK)}(${disableTracking ? `true` : ``}), `)
}
if (pure) {
push(PURE_ANNOTATION)
}
const callHelper: symbol = isBlock
? getVNodeBlockHelper(context.inSSR, isComponent)
: getVNodeHelper(context.inSSR, isComponent)
push(helper(callHelper) + `(`, node)
genNodeList(
genNullableArgs([tag, props, children, patchFlag, dynamicProps]),
context
)
push(`)`)
if (isBlock) {
push(`)`)
}
if (directives) {
push(`, `)
genNode(directives, context)
push(`)`)
}
}
function genNullableArgs(args: any[]): CallExpression['arguments'] {
let i = args.length
while (i--) {
if (args[i] != null) break
}
return args.slice(0, i + 1).map(arg => arg || `null`)
}
// JavaScript
function genCallExpression(node: CallExpression, context: CodegenContext) {
const { push, helper, pure } = context
const callee = isString(node.callee) ? node.callee : helper(node.callee)
if (pure) {
push(PURE_ANNOTATION)
}
push(callee + `(`, node)
genNodeList(node.arguments, context)
push(`)`)
}
function genObjectExpression(node: ObjectExpression, context: CodegenContext) {
const { push, indent, deindent, newline } = context
const { properties } = node
Iif (!properties.length) {
push(`{}`, node)
return
}
const multilines =
properties.length > 1 ||
((!__BROWSER__ || __DEV__) &&
properties.some(p => p.value.type !== NodeTypes.SIMPLE_EXPRESSION))
push(multilines ? `{` : `{ `)
multilines && indent()
for (let i = 0; i < properties.length; i++) {
const { key, value } = properties[i]
// key
genExpressionAsPropertyKey(key, context)
push(`: `)
// value
genNode(value, context)
if (i < properties.length - 1) {
// will only reach this if it's multilines
push(`,`)
newline()
}
}
multilines && deindent()
push(multilines ? `}` : ` }`)
}
function genArrayExpression(node: ArrayExpression, context: CodegenContext) {
genNodeListAsArray(node.elements as CodegenNode[], context)
}
function genFunctionExpression(
node: FunctionExpression,
context: CodegenContext
) {
const { push, indent, deindent } = context
const { params, returns, body, newline, isSlot } = node
if (isSlot) {
// wrap slot functions with owner context
push(`_${helperNameMap[WITH_CTX]}(`)
}
push(`(`, node)
if (isArray(params)) {
genNodeList(params, context)
} else if (params) {
genNode(params, context)
}
push(`) => `)
if (newline || body) {
push(`{`)
indent()
}
if (returns) {
if (newline) {
push(`return `)
}
if (isArray(returns)) {
genNodeListAsArray(returns, context)
} else {
genNode(returns, context)
}
} else if (body) {
genNode(body, context)
}
if (newline || body) {
deindent()
push(`}`)
}
if (isSlot) {
if (__COMPAT__ && node.isNonScopedSlot) {
push(`, undefined, true`)
}
push(`)`)
}
}
function genConditionalExpression(
node: ConditionalExpression,
context: CodegenContext
) {
const { test, consequent, alternate, newline: needNewline } = node
const { push, indent, deindent, newline } = context
if (test.type === NodeTypes.SIMPLE_EXPRESSION) {
const needsParens = !isSimpleIdentifier(test.content)
needsParens && push(`(`)
genExpression(test, context)
needsParens && push(`)`)
} else {
push(`(`)
genNode(test, context)
push(`)`)
}
needNewline && indent()
context.indentLevel++
needNewline || push(` `)
push(`? `)
genNode(consequent, context)
context.indentLevel--
needNewline && newline()
needNewline || push(` `)
push(`: `)
const isNested = alternate.type === NodeTypes.JS_CONDITIONAL_EXPRESSION
if (!isNested) {
context.indentLevel++
}
genNode(alternate, context)
if (!isNested) {
context.indentLevel--
}
needNewline && deindent(true /* without newline */)
}
function genCacheExpression(node: CacheExpression, context: CodegenContext) {
const { push, helper, indent, deindent, newline } = context
push(`_cache[${node.index}] || (`)
if (node.isVNode) {
indent()
push(`${helper(SET_BLOCK_TRACKING)}(-1),`)
newline()
}
push(`_cache[${node.index}] = `)
genNode(node.value, context)
if (node.isVNode) {
push(`,`)
newline()
push(`${helper(SET_BLOCK_TRACKING)}(1),`)
newline()
push(`_cache[${node.index}]`)
deindent()
}
push(`)`)
}
function genTemplateLiteral(node: TemplateLiteral, context: CodegenContext) {
const { push, indent, deindent } = context
push('`')
const l = node.elements.length
const multilines = l > 3
for (let i = 0; i < l; i++) {
const e = node.elements[i]
if (isString(e)) {
push(e.replace(/(`|\$|\\)/g, '\\$1'))
} else {
push('${')
if (multilines) indent()
genNode(e, context)
if (multilines) deindent()
push('}')
}
}
push('`')
}
function genIfStatement(node: IfStatement, context: CodegenContext) {
const { push, indent, deindent } = context
const { test, consequent, alternate } = node
push(`if (`)
genNode(test, context)
push(`) {`)
indent()
genNode(consequent, context)
deindent()
push(`}`)
if (alternate) {
push(` else `)
if (alternate.type === NodeTypes.JS_IF_STATEMENT) {
genIfStatement(alternate, context)
} else {
push(`{`)
indent()
genNode(alternate, context)
deindent()
push(`}`)
}
}
}
function genAssignmentExpression(
node: AssignmentExpression,
context: CodegenContext
) {
genNode(node.left, context)
context.push(` = `)
genNode(node.right, context)
}
function genSequenceExpression(
node: SequenceExpression,
context: CodegenContext
) {
context.push(`(`)
genNodeList(node.expressions, context)
context.push(`)`)
}
function genReturnStatement(
{ returns }: ReturnStatement,
context: CodegenContext
) {
context.push(`return `)
if (isArray(returns)) {
genNodeListAsArray(returns, context)
} else E{
genNode(returns, context)
}
}
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