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perf: cache json strings into const (#713)
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@nigrosimone
nigrosimone committed Apr 23, 2024
1 parent 43919dc commit 0fdf19e
Showing 1 changed file with 32 additions and 20 deletions.
52 changes: 32 additions & 20 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -140,21 +140,33 @@ function build (schema, options) {
const location = new Location(schema, context.rootSchemaId)
const code = buildValue(context, location, 'input')

let contextFunctionCode
let contextFunctionCode = `
const JSON_STR_BEGIN_OBJECT = '{'
const JSON_STR_END_OBJECT = '}'
const JSON_STR_BEGIN_ARRAY = '['
const JSON_STR_END_ARRAY = ']'
const JSON_STR_COMMA = ','
const JSON_STR_COLONS = ':'
const JSON_STR_QUOTE = '"'
const JSON_STR_EMPTY_OBJECT = JSON_STR_BEGIN_OBJECT + JSON_STR_END_OBJECT
const JSON_STR_EMPTY_ARRAY = JSON_STR_BEGIN_ARRAY + JSON_STR_END_ARRAY
const JSON_STR_EMPTY_STRING = JSON_STR_QUOTE + JSON_STR_QUOTE
const JSON_STR_NULL = 'null'
`

// If we have only the invocation of the 'anonymous0' function, we would
// basically just wrap the 'anonymous0' function in the 'main' function and
// and the overhead of the intermediate variable 'json'. We can avoid the
// wrapping and the unnecessary memory allocation by aliasing 'anonymous0' to
// 'main'
if (code === 'json += anonymous0(input)') {
contextFunctionCode = `
contextFunctionCode += `
${context.functions.join('\n')}
const main = anonymous0
return main
`
} else {
contextFunctionCode = `
contextFunctionCode += `
function main (input) {
let json = ''
${code}
Expand Down Expand Up @@ -284,7 +296,7 @@ function buildExtraObjectPropertiesSerializer (context, location, addComma) {
code += `
if (/${propertyKey.replace(/\\*\//g, '\\/')}/.test(key)) {
${addComma}
json += serializer.asString(key) + ':'
json += serializer.asString(key) + JSON_STR_COLONS
${buildValue(context, propertyLocation, 'value')}
continue
}
Expand All @@ -299,13 +311,13 @@ function buildExtraObjectPropertiesSerializer (context, location, addComma) {
if (additionalPropertiesSchema === true) {
code += `
${addComma}
json += serializer.asString(key) + ':' + JSON.stringify(value)
json += serializer.asString(key) + JSON_STR_COLONS + JSON.stringify(value)
`
} else {
const propertyLocation = location.getPropertyLocation('additionalProperties')
code += `
${addComma}
json += serializer.asString(key) + ':'
json += serializer.asString(key) + JSON_STR_COLONS
${buildValue(context, propertyLocation, 'value')}
`
}
Expand Down Expand Up @@ -341,12 +353,12 @@ function buildInnerObject (context, location) {
}
}

code += 'let json = \'{\'\n'
code += 'let json = JSON_STR_BEGIN_OBJECT\n'

let addComma = ''
if (!hasRequiredProperties) {
code += 'let addComma = false\n'
addComma = '!addComma && (addComma = true) || (json += \',\')'
addComma = '!addComma && (addComma = true) || (json += JSON_STR_COMMA)'
}

for (const key of propertiesKeys) {
Expand Down Expand Up @@ -392,7 +404,7 @@ function buildInnerObject (context, location) {
}

code += `
return json + '}'
return json + JSON_STR_END_OBJECT
`
return code
}
Expand Down Expand Up @@ -483,7 +495,7 @@ function buildObject (context, location) {
// ${schemaRef}
function ${functionName} (input) {
const obj = ${toJSON('input')}
${!nullable ? 'if (obj === null) return \'{}\'' : ''}
${!nullable ? 'if (obj === null) return JSON_STR_EMPTY_OBJECT' : ''}
${buildInnerObject(context, location)}
}
Expand Down Expand Up @@ -524,7 +536,7 @@ function buildArray (context, location) {

const nullable = schema.nullable === true
functionCode += `
${!nullable ? 'if (obj === null) return \'[]\'' : ''}
${!nullable ? 'if (obj === null) return JSON_STR_EMPTY_ARRAY' : ''}
if (!Array.isArray(obj)) {
throw new TypeError(\`The value of '${schemaRef}' does not match schema definition.\`)
}
Expand Down Expand Up @@ -559,7 +571,7 @@ function buildArray (context, location) {
if (${buildArrayTypeCondition(item.type, `[${i}]`)}) {
${tmpRes}
if (${i} < arrayEnd) {
json += ','
json += JSON_STR_COMMA
}
} else {
throw new Error(\`Item at ${i} does not match schema definition.\`)
Expand All @@ -573,7 +585,7 @@ function buildArray (context, location) {
for (let i = ${itemsSchema.length}; i < arrayLength; i++) {
json += JSON.stringify(obj[i])
if (i < arrayEnd) {
json += ','
json += JSON_STR_COMMA
}
}`
}
Expand All @@ -583,13 +595,13 @@ function buildArray (context, location) {
for (let i = 0; i < arrayLength; i++) {
${code}
if (i < arrayEnd) {
json += ','
json += JSON_STR_COMMA
}
}`
}

functionCode += `
return \`[\${json}]\`
return JSON_STR_BEGIN_ARRAY + json + JSON_STR_END_ARRAY
}`

context.functions.push(functionCode)
Expand Down Expand Up @@ -717,7 +729,7 @@ function buildSingleTypeSerializer (context, location, input) {

switch (schema.type) {
case 'null':
return 'json += \'null\''
return 'json += JSON_STR_NULL'
case 'string': {
if (schema.format === 'date-time') {
return `json += serializer.asDateTime(${input})`
Expand All @@ -731,9 +743,9 @@ function buildSingleTypeSerializer (context, location, input) {
return `
if (typeof ${input} !== 'string') {
if (${input} === null) {
json += '""'
json += JSON_STR_EMPTY_STRING
} else if (${input} instanceof Date) {
json += '"' + ${input}.toISOString() + '"'
json += JSON_STR_QUOTE + ${input}.toISOString() + JSON_STR_QUOTE
} else if (${input} instanceof RegExp) {
json += serializer.asString(${input}.source)
} else {
Expand Down Expand Up @@ -777,7 +789,7 @@ function buildConstSerializer (location, input) {
if (hasNullType) {
code += `
if (${input} === null) {
json += 'null'
json += JSON_STR_NULL
} else {
`
}
Expand Down Expand Up @@ -984,7 +996,7 @@ function buildValue (context, location, input) {
if (nullable) {
code += `
if (${input} === null) {
json += 'null'
json += JSON_STR_NULL
} else {
`
}
Expand Down

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