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perf(compiler): should only perform assertions during tests

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Compiler assertions are made to ensure implementation correctness,
but they have performance costs that should not affect users
during development.
This commit is contained in:
Evan You
2019-11-15 17:29:08 -05:00
parent 51d57b4566
commit 353b06df77
4 changed files with 32 additions and 25 deletions
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28
packages/compiler-core/src/parse.ts
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@@ -141,7 +141,7 @@ function parseChildren(
const nodes: TemplateChildNode[] = []
while (!isEnd(context, mode, ancestors)) {
__DEV__ && assert(context.source.length > 0)
__TEST__ && assert(context.source.length > 0)
const s = context.source
let node: TemplateChildNode | TemplateChildNode[] | undefined = undefined
@@ -286,16 +286,16 @@ function parseCDATA(
context: ParserContext,
ancestors: ElementNode[]
): TemplateChildNode[] {
__DEV__ &&
__TEST__ &&
assert(last(ancestors) == null || last(ancestors)!.ns !== Namespaces.HTML)
__DEV__ && assert(startsWith(context.source, '<![CDATA['))
__TEST__ && assert(startsWith(context.source, '<![CDATA['))
advanceBy(context, 9)
const nodes = parseChildren(context, TextModes.CDATA, ancestors)
if (context.source.length === 0) {
emitError(context, ErrorCodes.EOF_IN_CDATA)
} else {
__DEV__ && assert(startsWith(context.source, ']]>'))
__TEST__ && assert(startsWith(context.source, ']]>'))
advanceBy(context, 3)
}
@@ -303,7 +303,7 @@ function parseCDATA(
}
function parseComment(context: ParserContext): CommentNode {
__DEV__ && assert(startsWith(context.source, '<!--'))
__TEST__ && assert(startsWith(context.source, '<!--'))
const start = getCursor(context)
let content: string
@@ -345,7 +345,7 @@ function parseComment(context: ParserContext): CommentNode {
}
function parseBogusComment(context: ParserContext): CommentNode | undefined {
__DEV__ && assert(/^<(?:[\!\?]|\/[^a-z>])/i.test(context.source))
__TEST__ && assert(/^<(?:[\!\?]|\/[^a-z>])/i.test(context.source))
const start = getCursor(context)
const contentStart = context.source[1] === '?' ? 1 : 2
@@ -371,7 +371,7 @@ function parseElement(
context: ParserContext,
ancestors: ElementNode[]
): ElementNode | undefined {
__DEV__ && assert(/^<[a-z]/i.test(context.source))
__TEST__ && assert(/^<[a-z]/i.test(context.source))
// Start tag.
const wasInPre = context.inPre
@@ -425,8 +425,8 @@ function parseTag(
type: TagType,
parent: ElementNode | undefined
): ElementNode {
__DEV__ && assert(/^<\/?[a-z]/i.test(context.source))
__DEV__ &&
__TEST__ && assert(/^<\/?[a-z]/i.test(context.source))
__TEST__ &&
assert(
type === (startsWith(context.source, '</') ? TagType.End : TagType.Start)
)
@@ -538,7 +538,7 @@ function parseAttribute(
context: ParserContext,
nameSet: Set<string>
): AttributeNode | DirectiveNode {
__DEV__ && assert(/^[^\t\r\n\f />]/.test(context.source))
__TEST__ && assert(/^[^\t\r\n\f />]/.test(context.source))
// Name.
const start = getCursor(context)
@@ -725,7 +725,7 @@ function parseInterpolation(
mode: TextModes
): InterpolationNode | undefined {
const [open, close] = context.options.delimiters
__DEV__ && assert(startsWith(context.source, open))
__TEST__ && assert(startsWith(context.source, open))
const closeIndex = context.source.indexOf(close, open.length)
if (closeIndex === -1) {
@@ -765,7 +765,7 @@ function parseInterpolation(
}
function parseText(context: ParserContext, mode: TextModes): TextNode {
__DEV__ && assert(context.source.length > 0)
__TEST__ && assert(context.source.length > 0)
const [open] = context.options.delimiters
// TODO could probably use some perf optimization
@@ -777,7 +777,7 @@ function parseText(context: ParserContext, mode: TextModes): TextNode {
context.source.length
].filter(n => n !== -1)
)
__DEV__ && assert(endIndex > 0)
__TEST__ && assert(endIndex > 0)
const start = getCursor(context)
const content = parseTextData(context, endIndex, mode)
@@ -951,7 +951,7 @@ function startsWith(source: string, searchString: string): boolean {
function advanceBy(context: ParserContext, numberOfCharacters: number): void {
const { source } = context
__DEV__ && assert(numberOfCharacters <= source.length)
__TEST__ && assert(numberOfCharacters <= source.length)
advancePositionWithMutation(context, source, numberOfCharacters)
context.source = source.slice(numberOfCharacters)
}