616 lines
15 KiB
TypeScript
616 lines
15 KiB
TypeScript
import {
|
|
RootNode,
|
|
TemplateChildNode,
|
|
TextNode,
|
|
CommentNode,
|
|
ExpressionNode,
|
|
NodeTypes,
|
|
JSChildNode,
|
|
CallExpression,
|
|
ArrayExpression,
|
|
ObjectExpression,
|
|
SourceLocation,
|
|
Position,
|
|
InterpolationNode,
|
|
CompoundExpressionNode,
|
|
SimpleExpressionNode,
|
|
FunctionExpression,
|
|
SequenceExpression,
|
|
ConditionalExpression
|
|
} from './ast'
|
|
import { SourceMapGenerator, RawSourceMap } from 'source-map'
|
|
import {
|
|
advancePositionWithMutation,
|
|
assert,
|
|
isSimpleIdentifier,
|
|
loadDep,
|
|
toValidAssetId
|
|
} from './utils'
|
|
import { isString, isArray, isSymbol } from '@vue/shared'
|
|
import {
|
|
TO_STRING,
|
|
CREATE_VNODE,
|
|
COMMENT,
|
|
helperNameMap,
|
|
RESOLVE_COMPONENT,
|
|
RESOLVE_DIRECTIVE,
|
|
RuntimeHelper
|
|
} from './runtimeHelpers'
|
|
|
|
type CodegenNode = TemplateChildNode | JSChildNode
|
|
|
|
export interface CodegenOptions {
|
|
// - Module mode will generate ES module import statements for helpers
|
|
// and export the render function as the default export.
|
|
// - Function mode will generate a single `const { helpers... } = Vue`
|
|
// statement and return the render function. It is meant to be used with
|
|
// `new Function(code)()` to generate a render function at runtime.
|
|
// Default: 'function'
|
|
mode?: 'module' | 'function'
|
|
// Prefix suitable identifiers with _ctx.
|
|
// If this option is false, the generated code will be wrapped in a
|
|
// `with (this) { ... }` block.
|
|
// Default: false
|
|
prefixIdentifiers?: boolean
|
|
// Generate source map?
|
|
// Default: false
|
|
sourceMap?: boolean
|
|
// Filename for source map generation.
|
|
// Default: `template.vue.html`
|
|
filename?: string
|
|
}
|
|
|
|
export interface CodegenResult {
|
|
code: string
|
|
ast: RootNode
|
|
map?: RawSourceMap
|
|
}
|
|
|
|
export interface CodegenContext extends Required<CodegenOptions> {
|
|
source: string
|
|
code: string
|
|
line: number
|
|
column: number
|
|
offset: number
|
|
indentLevel: number
|
|
map?: SourceMapGenerator
|
|
helper(key: RuntimeHelper): string
|
|
push(code: string, node?: CodegenNode, openOnly?: boolean): void
|
|
resetMapping(loc: SourceLocation): void
|
|
indent(): void
|
|
deindent(withoutNewLine?: boolean): void
|
|
newline(): void
|
|
}
|
|
|
|
function createCodegenContext(
|
|
ast: RootNode,
|
|
{
|
|
mode = 'function',
|
|
prefixIdentifiers = mode === 'module',
|
|
sourceMap = false,
|
|
filename = `template.vue.html`
|
|
}: CodegenOptions
|
|
): CodegenContext {
|
|
const context: CodegenContext = {
|
|
mode,
|
|
prefixIdentifiers,
|
|
sourceMap,
|
|
filename,
|
|
source: ast.loc.source,
|
|
code: ``,
|
|
column: 1,
|
|
line: 1,
|
|
offset: 0,
|
|
indentLevel: 0,
|
|
|
|
// lazy require source-map implementation, only in non-browser builds!
|
|
map:
|
|
__BROWSER__ || !sourceMap
|
|
? undefined
|
|
: new (loadDep('source-map')).SourceMapGenerator(),
|
|
|
|
helper(key) {
|
|
const name = helperNameMap[key]
|
|
return prefixIdentifiers ? name : `_${name}`
|
|
},
|
|
push(code, node, openOnly) {
|
|
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 && !openOnly) {
|
|
addMapping(node.loc.end)
|
|
}
|
|
}
|
|
},
|
|
resetMapping(loc: SourceLocation) {
|
|
if (!__BROWSER__ && context.map) {
|
|
addMapping(loc.start)
|
|
}
|
|
},
|
|
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__ && context.map) {
|
|
context.map.setSourceContent(filename, context.source)
|
|
}
|
|
return context
|
|
}
|
|
|
|
export function generate(
|
|
ast: RootNode,
|
|
options: CodegenOptions = {}
|
|
): CodegenResult {
|
|
const context = createCodegenContext(ast, options)
|
|
const {
|
|
mode,
|
|
push,
|
|
helper,
|
|
prefixIdentifiers,
|
|
indent,
|
|
deindent,
|
|
newline
|
|
} = context
|
|
const hasHelpers = ast.helpers.length > 0
|
|
const useWithBlock = !prefixIdentifiers && mode !== 'module'
|
|
|
|
// preambles
|
|
if (mode === 'function') {
|
|
// 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 (hasHelpers) {
|
|
if (prefixIdentifiers) {
|
|
push(`const { ${ast.helpers.map(helper).join(', ')} } = Vue\n`)
|
|
} else {
|
|
// "with" mode.
|
|
// save Vue in a separate variable to avoid collision
|
|
push(`const _Vue = Vue\n`)
|
|
// in "with" mode, helpers are declared inside the with block to avoid
|
|
// has check cost, but hoists are lifted out of the function - we need
|
|
// to provide the helper here.
|
|
if (ast.hoists.length) {
|
|
push(`const _${helperNameMap[CREATE_VNODE]} = Vue.createVNode\n`)
|
|
}
|
|
}
|
|
}
|
|
genHoists(ast.hoists, context)
|
|
context.newline()
|
|
push(`return `)
|
|
} else {
|
|
// generate import statements for helpers
|
|
if (hasHelpers) {
|
|
push(`import { ${ast.helpers.map(helper).join(', ')} } from "vue"\n`)
|
|
}
|
|
genHoists(ast.hoists, context)
|
|
context.newline()
|
|
push(`export default `)
|
|
}
|
|
|
|
// enter render function
|
|
push(`function render() {`)
|
|
indent()
|
|
|
|
if (useWithBlock) {
|
|
push(`with (this) {`)
|
|
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 { ${ast.helpers
|
|
.map(s => `${helperNameMap[s]}: _${helperNameMap[s]}`)
|
|
.join(', ')} } = _Vue`
|
|
)
|
|
newline()
|
|
newline()
|
|
}
|
|
} else {
|
|
push(`const _ctx = this`)
|
|
newline()
|
|
}
|
|
|
|
// generate asset resolution statements
|
|
if (ast.components.length) {
|
|
genAssets(ast.components, 'component', context)
|
|
}
|
|
if (ast.directives.length) {
|
|
genAssets(ast.directives, 'directive', context)
|
|
}
|
|
if (ast.components.length || ast.directives.length) {
|
|
newline()
|
|
}
|
|
|
|
// generate the VNode tree expression
|
|
push(`return `)
|
|
if (ast.codegenNode) {
|
|
genNode(ast.codegenNode, context)
|
|
} else {
|
|
push(`null`)
|
|
}
|
|
|
|
if (useWithBlock) {
|
|
deindent()
|
|
push(`}`)
|
|
}
|
|
|
|
deindent()
|
|
push(`}`)
|
|
return {
|
|
ast,
|
|
code: context.code,
|
|
map: context.map ? context.map.toJSON() : undefined
|
|
}
|
|
}
|
|
|
|
function genAssets(
|
|
assets: string[],
|
|
type: 'component' | 'directive',
|
|
context: CodegenContext
|
|
) {
|
|
const resolver = context.helper(
|
|
type === 'component' ? RESOLVE_COMPONENT : RESOLVE_DIRECTIVE
|
|
)
|
|
for (let i = 0; i < assets.length; i++) {
|
|
const id = assets[i]
|
|
context.push(
|
|
`const ${toValidAssetId(id, type)} = ${resolver}(${JSON.stringify(id)})`
|
|
)
|
|
context.newline()
|
|
}
|
|
}
|
|
|
|
function genHoists(hoists: JSChildNode[], context: CodegenContext) {
|
|
if (!hoists.length) {
|
|
return
|
|
}
|
|
context.newline()
|
|
hoists.forEach((exp, i) => {
|
|
context.push(`const _hoisted_${i + 1} = `)
|
|
genNode(exp, context)
|
|
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 | RuntimeHelper | CodegenNode | TemplateChildNode[])[],
|
|
context: CodegenContext,
|
|
multilines: boolean = false
|
|
) {
|
|
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) {
|
|
push(',')
|
|
newline()
|
|
} else {
|
|
push(', ')
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
function genNode(
|
|
node: CodegenNode | RuntimeHelper | string,
|
|
context: CodegenContext
|
|
) {
|
|
if (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.COMPOUND_EXPRESSION:
|
|
genCompoundExpression(node, context)
|
|
break
|
|
case NodeTypes.COMMENT:
|
|
genComment(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_SEQUENCE_EXPRESSION:
|
|
genSequenceExpression(node, context)
|
|
break
|
|
case NodeTypes.JS_CONDITIONAL_EXPRESSION:
|
|
genConditionalExpression(node, context)
|
|
break
|
|
/* istanbul ignore next */
|
|
default:
|
|
if (__DEV__) {
|
|
assert(false, `unhandled codegen node type: ${(node as any).type}`)
|
|
// make sure we exhaust all possible types
|
|
const exhaustiveCheck: never = node
|
|
return exhaustiveCheck
|
|
}
|
|
}
|
|
}
|
|
|
|
function genText(
|
|
node: TextNode | SimpleExpressionNode,
|
|
context: CodegenContext
|
|
) {
|
|
context.push(JSON.stringify(node.content), node)
|
|
}
|
|
|
|
function genExpression(node: SimpleExpressionNode, context: CodegenContext) {
|
|
const { content, isStatic } = node
|
|
context.push(isStatic ? JSON.stringify(content) : content, node)
|
|
}
|
|
|
|
function genInterpolation(node: InterpolationNode, context: CodegenContext) {
|
|
const { push, helper } = context
|
|
push(`${helper(TO_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(`[${node.content}]`, node)
|
|
}
|
|
}
|
|
|
|
function genComment(node: CommentNode, context: CodegenContext) {
|
|
if (__DEV__) {
|
|
const { push, helper } = context
|
|
push(
|
|
`${helper(CREATE_VNODE)}(${helper(COMMENT)}, 0, ${JSON.stringify(
|
|
node.content
|
|
)})`,
|
|
node
|
|
)
|
|
}
|
|
}
|
|
|
|
// JavaScript
|
|
function genCallExpression(node: CallExpression, context: CodegenContext) {
|
|
const callee = isString(node.callee)
|
|
? node.callee
|
|
: context.helper(node.callee)
|
|
context.push(callee + `(`, node, true)
|
|
genNodeList(node.arguments, context)
|
|
context.push(`)`)
|
|
}
|
|
|
|
function genObjectExpression(node: ObjectExpression, context: CodegenContext) {
|
|
const { push, indent, deindent, newline, resetMapping } = 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, loc } = properties[i]
|
|
resetMapping(loc) // reset source mapping for every property.
|
|
// 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()
|
|
const lastChar = context.code[context.code.length - 1]
|
|
push(multilines || /[\])}]/.test(lastChar) ? `}` : ` }`)
|
|
}
|
|
|
|
function genArrayExpression(node: ArrayExpression, context: CodegenContext) {
|
|
genNodeListAsArray(node.elements, context)
|
|
}
|
|
|
|
function genFunctionExpression(
|
|
node: FunctionExpression,
|
|
context: CodegenContext
|
|
) {
|
|
const { push, indent, deindent } = context
|
|
const { params, returns, newline } = node
|
|
push(`(`, node)
|
|
if (isArray(params)) {
|
|
genNodeList(params, context)
|
|
} else if (params) {
|
|
genNode(params, context)
|
|
}
|
|
push(`) => `)
|
|
if (newline) {
|
|
push(`{`)
|
|
indent()
|
|
push(`return `)
|
|
}
|
|
if (isArray(returns)) {
|
|
genNodeListAsArray(returns, context)
|
|
} else {
|
|
genNode(returns, context)
|
|
}
|
|
if (newline) {
|
|
deindent()
|
|
push(`}`)
|
|
}
|
|
}
|
|
|
|
function genConditionalExpression(
|
|
node: ConditionalExpression,
|
|
context: CodegenContext
|
|
) {
|
|
const { test, consequent, alternate } = 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(`(`)
|
|
genCompoundExpression(test, context)
|
|
push(`)`)
|
|
}
|
|
indent()
|
|
context.indentLevel++
|
|
push(`? `)
|
|
genNode(consequent, context)
|
|
context.indentLevel--
|
|
newline()
|
|
push(`: `)
|
|
const isNested = alternate.type === NodeTypes.JS_CONDITIONAL_EXPRESSION
|
|
if (!isNested) {
|
|
context.indentLevel++
|
|
}
|
|
genNode(alternate, context)
|
|
if (!isNested) {
|
|
context.indentLevel--
|
|
}
|
|
deindent(true /* without newline */)
|
|
}
|
|
|
|
function genSequenceExpression(
|
|
node: SequenceExpression,
|
|
context: CodegenContext
|
|
) {
|
|
context.push(`(`)
|
|
genNodeList(node.expressions, context)
|
|
context.push(`)`)
|
|
}
|