limit.ts
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import type Ajv from "ajv"
import type {
Plugin,
CodeKeywordDefinition,
KeywordErrorDefinition,
Code,
Name,
ErrorObject,
} from "ajv"
import type {AddedFormat} from "ajv/dist/types"
import type {Rule} from "ajv/dist/compile/rules"
import {KeywordCxt} from "ajv"
import {_, str, or, getProperty, operators} from "ajv/dist/compile/codegen"
type Kwd = "formatMaximum" | "formatMinimum" | "formatExclusiveMaximum" | "formatExclusiveMinimum"
type Comparison = "<=" | ">=" | "<" | ">"
const ops = operators
const KWDs: {[K in Kwd]: {okStr: Comparison; ok: Code; fail: Code}} = {
formatMaximum: {okStr: "<=", ok: ops.LTE, fail: ops.GT},
formatMinimum: {okStr: ">=", ok: ops.GTE, fail: ops.LT},
formatExclusiveMaximum: {okStr: "<", ok: ops.LT, fail: ops.GTE},
formatExclusiveMinimum: {okStr: ">", ok: ops.GT, fail: ops.LTE},
}
export type LimitFormatError = ErrorObject<Kwd, {limit: string; comparison: Comparison}>
const error: KeywordErrorDefinition = {
message: ({keyword, schemaCode}) => str`should be ${KWDs[keyword as Kwd].okStr} ${schemaCode}`,
params: ({keyword, schemaCode}) =>
_`{comparison: ${KWDs[keyword as Kwd].okStr}, limit: ${schemaCode}}`,
}
export const formatLimitDefinition: CodeKeywordDefinition = {
keyword: Object.keys(KWDs),
type: "string",
schemaType: "string",
$data: true,
error,
code(cxt) {
const {gen, data, schemaCode, keyword, it} = cxt
const {opts, self} = it
if (!opts.validateFormats) return
const fCxt = new KeywordCxt(it, (self.RULES.all.format as Rule).definition, "format")
if (fCxt.$data) validate$DataFormat()
else validateFormat()
function validate$DataFormat(): void {
const fmts = gen.scopeValue("formats", {
ref: self.formats,
code: opts.code.formats,
})
const fmt = gen.const("fmt", _`${fmts}[${fCxt.schemaCode}]`)
cxt.fail$data(
or(
_`typeof ${fmt} != "object"`,
_`${fmt} instanceof RegExp`,
_`typeof ${fmt}.compare != "function"`,
compareCode(fmt)
)
)
}
function validateFormat(): void {
const format = fCxt.schema as string
const fmtDef: AddedFormat | undefined = self.formats[format]
if (!fmtDef || fmtDef === true) return
if (
typeof fmtDef != "object" ||
fmtDef instanceof RegExp ||
typeof fmtDef.compare != "function"
) {
throw new Error(`"${keyword}": format "${format}" does not define "compare" function`)
}
const fmt = gen.scopeValue("formats", {
key: format,
ref: fmtDef,
code: opts.code.formats ? _`${opts.code.formats}${getProperty(format)}` : undefined,
})
cxt.fail$data(compareCode(fmt))
}
function compareCode(fmt: Name): Code {
return _`${fmt}.compare(${data}, ${schemaCode}) ${KWDs[keyword as Kwd].fail} 0`
}
},
dependencies: ["format"],
}
const formatLimitPlugin: Plugin<undefined> = (ajv: Ajv): Ajv => {
ajv.addKeyword(formatLimitDefinition)
return ajv
}
export default formatLimitPlugin