959 lines
23 KiB
TypeScript
959 lines
23 KiB
TypeScript
import { CodegenOptions } from './options'
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import {
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RootNode,
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TemplateChildNode,
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TextNode,
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CommentNode,
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ExpressionNode,
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NodeTypes,
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JSChildNode,
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CallExpression,
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ArrayExpression,
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ObjectExpression,
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Position,
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InterpolationNode,
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CompoundExpressionNode,
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SimpleExpressionNode,
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FunctionExpression,
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ConditionalExpression,
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CacheExpression,
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locStub,
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SSRCodegenNode,
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TemplateLiteral,
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IfStatement,
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AssignmentExpression,
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ReturnStatement,
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VNodeCall,
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SequenceExpression
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} from './ast'
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import { SourceMapGenerator, RawSourceMap } from 'source-map'
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import {
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advancePositionWithMutation,
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assert,
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isSimpleIdentifier,
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toValidAssetId
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} from './utils'
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import { isString, isArray, isSymbol } from '@vue/shared'
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import {
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helperNameMap,
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TO_DISPLAY_STRING,
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CREATE_VNODE,
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RESOLVE_COMPONENT,
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RESOLVE_DIRECTIVE,
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SET_BLOCK_TRACKING,
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CREATE_COMMENT,
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CREATE_TEXT,
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PUSH_SCOPE_ID,
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POP_SCOPE_ID,
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WITH_SCOPE_ID,
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WITH_DIRECTIVES,
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CREATE_BLOCK,
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OPEN_BLOCK,
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CREATE_STATIC,
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WITH_CTX
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} from './runtimeHelpers'
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import { ImportItem } from './transform'
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const PURE_ANNOTATION = `/*#__PURE__*/`
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type CodegenNode = TemplateChildNode | JSChildNode | SSRCodegenNode
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export interface CodegenResult {
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code: string
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ast: RootNode
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map?: RawSourceMap
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}
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export interface CodegenContext extends Required<CodegenOptions> {
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source: string
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code: string
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line: number
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column: number
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offset: number
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indentLevel: number
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pure: boolean
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map?: SourceMapGenerator
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helper(key: symbol): string
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push(code: string, node?: CodegenNode): void
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indent(): void
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deindent(withoutNewLine?: boolean): void
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newline(): void
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}
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function createCodegenContext(
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ast: RootNode,
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{
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mode = 'function',
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prefixIdentifiers = mode === 'module',
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sourceMap = false,
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filename = `template.vue.html`,
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scopeId = null,
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optimizeBindings = false,
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runtimeGlobalName = `Vue`,
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runtimeModuleName = `vue`,
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ssr = false
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}: CodegenOptions
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): CodegenContext {
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const context: CodegenContext = {
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mode,
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prefixIdentifiers,
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sourceMap,
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filename,
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scopeId,
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optimizeBindings,
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runtimeGlobalName,
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runtimeModuleName,
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ssr,
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source: ast.loc.source,
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code: ``,
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column: 1,
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line: 1,
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offset: 0,
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indentLevel: 0,
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pure: false,
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map: undefined,
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helper(key) {
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return `_${helperNameMap[key]}`
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},
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push(code, node) {
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context.code += code
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if (!__BROWSER__ && context.map) {
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if (node) {
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let name
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if (node.type === NodeTypes.SIMPLE_EXPRESSION && !node.isStatic) {
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const content = node.content.replace(/^_ctx\./, '')
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if (content !== node.content && isSimpleIdentifier(content)) {
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name = content
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}
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}
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addMapping(node.loc.start, name)
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}
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advancePositionWithMutation(context, code)
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if (node && node.loc !== locStub) {
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addMapping(node.loc.end)
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}
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}
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},
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indent() {
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newline(++context.indentLevel)
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},
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deindent(withoutNewLine = false) {
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if (withoutNewLine) {
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--context.indentLevel
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} else {
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newline(--context.indentLevel)
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}
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},
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newline() {
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newline(context.indentLevel)
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}
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}
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function newline(n: number) {
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context.push('\n' + ` `.repeat(n))
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}
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function addMapping(loc: Position, name?: string) {
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context.map!.addMapping({
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name,
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source: context.filename,
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original: {
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line: loc.line,
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column: loc.column - 1 // source-map column is 0 based
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},
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generated: {
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line: context.line,
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column: context.column - 1
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}
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})
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}
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if (!__BROWSER__ && sourceMap) {
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// lazy require source-map implementation, only in non-browser builds
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context.map = new SourceMapGenerator()
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context.map!.setSourceContent(filename, context.source)
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}
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return context
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}
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export function generate(
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ast: RootNode,
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options: CodegenOptions = {}
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): CodegenResult {
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const context = createCodegenContext(ast, options)
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const {
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mode,
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push,
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prefixIdentifiers,
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indent,
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deindent,
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newline,
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scopeId,
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ssr
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} = context
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const hasHelpers = ast.helpers.length > 0
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const useWithBlock = !prefixIdentifiers && mode !== 'module'
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const genScopeId = !__BROWSER__ && scopeId != null && mode === 'module'
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// preambles
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if (!__BROWSER__ && mode === 'module') {
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genModulePreamble(ast, context, genScopeId)
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} else {
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genFunctionPreamble(ast, context)
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}
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// enter render function
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if (genScopeId && !ssr) {
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push(`const render = ${PURE_ANNOTATION}_withId(`)
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}
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if (!ssr) {
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push(`function render(_ctx, _cache) {`)
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} else {
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push(`function ssrRender(_ctx, _push, _parent) {`)
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}
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indent()
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if (useWithBlock) {
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push(`with (_ctx) {`)
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indent()
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// function mode const declarations should be inside with block
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// also they should be renamed to avoid collision with user properties
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if (hasHelpers) {
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push(
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`const { ${ast.helpers
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.map(s => `${helperNameMap[s]}: _${helperNameMap[s]}`)
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.join(', ')} } = _Vue`
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)
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push(`\n`)
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newline()
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}
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}
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// generate asset resolution statements
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if (ast.components.length) {
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genAssets(ast.components, 'component', context)
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if (ast.directives.length || ast.temps > 0) {
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newline()
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}
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}
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if (ast.directives.length) {
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genAssets(ast.directives, 'directive', context)
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if (ast.temps > 0) {
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newline()
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}
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}
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if (ast.temps > 0) {
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push(`let `)
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for (let i = 0; i < ast.temps; i++) {
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push(`${i > 0 ? `, ` : ``}_temp${i}`)
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}
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}
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if (ast.components.length || ast.directives.length || ast.temps) {
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push(`\n`)
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newline()
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}
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// generate the VNode tree expression
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if (!ssr) {
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push(`return `)
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}
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if (ast.codegenNode) {
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genNode(ast.codegenNode, context)
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} else {
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push(`null`)
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}
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if (useWithBlock) {
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deindent()
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push(`}`)
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}
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deindent()
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push(`}`)
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if (genScopeId && !ssr) {
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push(`)`)
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}
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return {
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ast,
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code: context.code,
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// SourceMapGenerator does have toJSON() method but it's not in the types
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map: context.map ? (context.map as any).toJSON() : undefined
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}
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}
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function genFunctionPreamble(ast: RootNode, context: CodegenContext) {
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const {
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ssr,
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prefixIdentifiers,
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push,
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newline,
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runtimeModuleName,
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runtimeGlobalName
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} = context
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const VueBinding =
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!__BROWSER__ && ssr
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? `require(${JSON.stringify(runtimeModuleName)})`
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: runtimeGlobalName
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const aliasHelper = (s: symbol) => `${helperNameMap[s]}: _${helperNameMap[s]}`
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// Generate const declaration for helpers
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// In prefix mode, we place the const declaration at top so it's done
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// only once; But if we not prefixing, we place the declaration inside the
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// with block so it doesn't incur the `in` check cost for every helper access.
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if (ast.helpers.length > 0) {
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if (!__BROWSER__ && prefixIdentifiers) {
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push(
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`const { ${ast.helpers.map(aliasHelper).join(', ')} } = ${VueBinding}\n`
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)
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} else {
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// "with" mode.
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// save Vue in a separate variable to avoid collision
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push(`const _Vue = ${VueBinding}\n`)
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// in "with" mode, helpers are declared inside the with block to avoid
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// has check cost, but hoists are lifted out of the function - we need
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// to provide the helper here.
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if (ast.hoists.length) {
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const staticHelpers = [
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CREATE_VNODE,
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CREATE_COMMENT,
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CREATE_TEXT,
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CREATE_STATIC
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]
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.filter(helper => ast.helpers.includes(helper))
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.map(aliasHelper)
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.join(', ')
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push(`const { ${staticHelpers} } = _Vue\n`)
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}
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}
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}
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// generate variables for ssr helpers
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if (!__BROWSER__ && ast.ssrHelpers && ast.ssrHelpers.length) {
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// ssr guaruntees prefixIdentifier: true
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push(
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`const { ${ast.ssrHelpers
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.map(aliasHelper)
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.join(', ')} } = require("@vue/server-renderer")\n`
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)
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}
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genHoists(ast.hoists, context)
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newline()
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push(`return `)
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}
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function genModulePreamble(
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ast: RootNode,
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context: CodegenContext,
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genScopeId: boolean
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) {
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const {
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push,
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helper,
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newline,
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scopeId,
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optimizeBindings,
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runtimeModuleName
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} = context
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if (genScopeId) {
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ast.helpers.push(WITH_SCOPE_ID)
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if (ast.hoists.length) {
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ast.helpers.push(PUSH_SCOPE_ID, POP_SCOPE_ID)
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}
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}
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// generate import statements for helpers
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if (ast.helpers.length) {
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if (optimizeBindings) {
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// when bundled with webpack with code-split, calling an import binding
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// as a function leads to it being wrapped with `Object(a.b)` or `(0,a.b)`,
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// incurring both payload size increase and potential perf overhead.
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// therefore we assign the imports to vairables (which is a constant ~50b
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// cost per-component instead of scaling with template size)
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push(
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`import { ${ast.helpers
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.map(s => helperNameMap[s])
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.join(', ')} } from ${JSON.stringify(runtimeModuleName)}\n`
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)
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push(
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`\n// Binding optimization for webpack code-split\nconst ${ast.helpers
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.map(s => `_${helperNameMap[s]} = ${helperNameMap[s]}`)
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.join(', ')}\n`
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)
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} else {
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push(
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`import { ${ast.helpers
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.map(s => `${helperNameMap[s]} as _${helperNameMap[s]}`)
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.join(', ')} } from ${JSON.stringify(runtimeModuleName)}\n`
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)
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}
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}
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if (ast.ssrHelpers && ast.ssrHelpers.length) {
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push(
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`import { ${ast.ssrHelpers
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.map(s => `${helperNameMap[s]} as _${helperNameMap[s]}`)
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.join(', ')} } from "@vue/server-renderer"\n`
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)
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}
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if (ast.imports.length) {
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genImports(ast.imports, context)
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newline()
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}
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if (genScopeId) {
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push(
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`const _withId = ${PURE_ANNOTATION}${helper(WITH_SCOPE_ID)}("${scopeId}")`
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)
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newline()
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}
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genHoists(ast.hoists, context)
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newline()
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push(`export `)
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}
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function genAssets(
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assets: string[],
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type: 'component' | 'directive',
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{ helper, push, newline }: CodegenContext
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) {
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const resolver = helper(
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type === 'component' ? RESOLVE_COMPONENT : RESOLVE_DIRECTIVE
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)
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for (let i = 0; i < assets.length; i++) {
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const id = assets[i]
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push(
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`const ${toValidAssetId(id, type)} = ${resolver}(${JSON.stringify(id)})`
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)
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if (i < assets.length - 1) {
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newline()
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}
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}
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}
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function genHoists(hoists: (JSChildNode | null)[], context: CodegenContext) {
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if (!hoists.length) {
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return
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}
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context.pure = true
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const { push, newline, helper, scopeId, mode } = context
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const genScopeId = !__BROWSER__ && scopeId != null && mode !== 'function'
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newline()
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// push scope Id before initilaizing hoisted vnodes so that these vnodes
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// get the proper scopeId as well.
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if (genScopeId) {
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push(`${helper(PUSH_SCOPE_ID)}("${scopeId}")`)
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newline()
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}
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hoists.forEach((exp, i) => {
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if (exp) {
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push(`const _hoisted_${i + 1} = `)
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genNode(exp, context)
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newline()
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}
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})
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if (genScopeId) {
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push(`${helper(POP_SCOPE_ID)}()`)
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newline()
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}
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context.pure = false
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}
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function genImports(importsOptions: ImportItem[], context: CodegenContext) {
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if (!importsOptions.length) {
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return
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}
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importsOptions.forEach(imports => {
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context.push(`import `)
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genNode(imports.exp, context)
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context.push(` from '${imports.path}'`)
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context.newline()
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})
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}
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function isText(n: string | CodegenNode) {
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return (
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isString(n) ||
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n.type === NodeTypes.SIMPLE_EXPRESSION ||
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n.type === NodeTypes.TEXT ||
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n.type === NodeTypes.INTERPOLATION ||
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n.type === NodeTypes.COMPOUND_EXPRESSION
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)
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}
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function genNodeListAsArray(
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nodes: (string | CodegenNode | TemplateChildNode[])[],
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context: CodegenContext
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) {
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const multilines =
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nodes.length > 3 ||
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((!__BROWSER__ || __DEV__) && nodes.some(n => isArray(n) || !isText(n)))
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context.push(`[`)
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multilines && context.indent()
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genNodeList(nodes, context, multilines)
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multilines && context.deindent()
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context.push(`]`)
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}
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function genNodeList(
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nodes: (string | symbol | CodegenNode | TemplateChildNode[])[],
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context: CodegenContext,
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multilines: boolean = false,
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comma: boolean = true
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) {
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const { push, newline } = context
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for (let i = 0; i < nodes.length; i++) {
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const node = nodes[i]
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if (isString(node)) {
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push(node)
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} else if (isArray(node)) {
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genNodeListAsArray(node, context)
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} else {
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genNode(node, context)
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}
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if (i < nodes.length - 1) {
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if (multilines) {
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comma && push(',')
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newline()
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} else {
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comma && push(', ')
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}
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}
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}
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}
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function genNode(node: CodegenNode | symbol | string, context: CodegenContext) {
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if (isString(node)) {
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context.push(node)
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return
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}
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if (isSymbol(node)) {
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context.push(context.helper(node))
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return
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}
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switch (node.type) {
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case NodeTypes.ELEMENT:
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case NodeTypes.IF:
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case NodeTypes.FOR:
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__DEV__ &&
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assert(
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node.codegenNode != null,
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`Codegen node is missing for element/if/for node. ` +
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`Apply appropriate transforms first.`
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)
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genNode(node.codegenNode!, context)
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break
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case NodeTypes.TEXT:
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genText(node, context)
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break
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case NodeTypes.SIMPLE_EXPRESSION:
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genExpression(node, context)
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break
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case NodeTypes.INTERPOLATION:
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genInterpolation(node, context)
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break
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case NodeTypes.TEXT_CALL:
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genNode(node.codegenNode, context)
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break
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case NodeTypes.COMPOUND_EXPRESSION:
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genCompoundExpression(node, context)
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break
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case NodeTypes.COMMENT:
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genComment(node, context)
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break
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case NodeTypes.VNODE_CALL:
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genVNodeCall(node, context)
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break
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case NodeTypes.JS_CALL_EXPRESSION:
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genCallExpression(node, context)
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break
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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
|
|
|
|
// SSR only types
|
|
case NodeTypes.JS_BLOCK_STATEMENT:
|
|
!__BROWSER__ && genNodeList(node.body, context, true, false)
|
|
break
|
|
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:
|
|
if (__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(`[${node.content}]`, node)
|
|
}
|
|
}
|
|
|
|
function genComment(node: CommentNode, context: CodegenContext) {
|
|
if (__DEV__) {
|
|
const { push, helper, pure } = context
|
|
if (pure) {
|
|
push(PURE_ANNOTATION)
|
|
}
|
|
push(`${helper(CREATE_COMMENT)}(${JSON.stringify(node.content)})`, node)
|
|
}
|
|
}
|
|
|
|
function genVNodeCall(node: VNodeCall, context: CodegenContext) {
|
|
const { push, helper, pure } = context
|
|
const {
|
|
tag,
|
|
props,
|
|
children,
|
|
patchFlag,
|
|
dynamicProps,
|
|
directives,
|
|
isBlock,
|
|
isForBlock
|
|
} = node
|
|
if (directives) {
|
|
push(helper(WITH_DIRECTIVES) + `(`)
|
|
}
|
|
if (isBlock) {
|
|
push(`(${helper(OPEN_BLOCK)}(${isForBlock ? `true` : ``}), `)
|
|
}
|
|
if (pure) {
|
|
push(PURE_ANNOTATION)
|
|
}
|
|
push(helper(isBlock ? CREATE_BLOCK : CREATE_VNODE) + `(`, 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
|
|
if (!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, context)
|
|
}
|
|
|
|
function genFunctionExpression(
|
|
node: FunctionExpression,
|
|
context: CodegenContext
|
|
) {
|
|
const { push, indent, deindent, scopeId, mode } = context
|
|
const { params, returns, body, newline, isSlot } = node
|
|
// slot functions also need to push scopeId before rendering its content
|
|
const genScopeId =
|
|
!__BROWSER__ && isSlot && scopeId != null && mode !== 'function'
|
|
|
|
if (genScopeId) {
|
|
push(`_withId(`)
|
|
} else if (isSlot) {
|
|
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 (genScopeId || isSlot) {
|
|
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[${node.index}]`)
|
|
deindent()
|
|
}
|
|
push(`)`)
|
|
}
|
|
|
|
function genTemplateLiteral(node: TemplateLiteral, context: CodegenContext) {
|
|
const { push, indent, deindent } = context
|
|
push('`')
|
|
const l = node.elements.length
|
|
const multilines = l > 3
|
|
for (let i = 0; i < l; i++) {
|
|
const e = node.elements[i]
|
|
if (isString(e)) {
|
|
push(e.replace(/`/g, '\\`'))
|
|
} else {
|
|
push('${')
|
|
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 {
|
|
genNode(returns, context)
|
|
}
|
|
}
|