412 lines
12 KiB
TypeScript
412 lines
12 KiB
TypeScript
import type Ajv from "../../core"
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import type {SchemaObject} from "../../types"
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import {jtdForms, JTDForm, SchemaObjectMap} from "./types"
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import {SchemaEnv, getCompilingSchema} from ".."
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import {_, str, and, or, nil, not, CodeGen, Code, Name, SafeExpr} from "../codegen"
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import MissingRefError from "../ref_error"
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import N from "../names"
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import {hasPropFunc} from "../../vocabularies/code"
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import {hasRef} from "../../vocabularies/jtd/ref"
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import {intRange, IntType} from "../../vocabularies/jtd/type"
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import {parseJson, parseJsonNumber, parseJsonString} from "../../runtime/parseJson"
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import {useFunc} from "../util"
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import validTimestamp from "../../runtime/timestamp"
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type GenParse = (cxt: ParseCxt) => void
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const genParse: {[F in JTDForm]: GenParse} = {
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elements: parseElements,
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values: parseValues,
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discriminator: parseDiscriminator,
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properties: parseProperties,
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optionalProperties: parseProperties,
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enum: parseEnum,
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type: parseType,
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ref: parseRef,
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}
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interface ParseCxt {
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readonly gen: CodeGen
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readonly self: Ajv // current Ajv instance
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readonly schemaEnv: SchemaEnv
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readonly definitions: SchemaObjectMap
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schema: SchemaObject
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data: Code
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parseName: Name
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char: Name
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}
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export default function compileParser(
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this: Ajv,
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sch: SchemaEnv,
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definitions: SchemaObjectMap
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): SchemaEnv {
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const _sch = getCompilingSchema.call(this, sch)
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if (_sch) return _sch
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const {es5, lines} = this.opts.code
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const {ownProperties} = this.opts
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const gen = new CodeGen(this.scope, {es5, lines, ownProperties})
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const parseName = gen.scopeName("parse")
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const cxt: ParseCxt = {
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self: this,
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gen,
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schema: sch.schema as SchemaObject,
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schemaEnv: sch,
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definitions,
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data: N.data,
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parseName,
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char: gen.name("c"),
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}
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let sourceCode: string | undefined
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try {
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this._compilations.add(sch)
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sch.parseName = parseName
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parserFunction(cxt)
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gen.optimize(this.opts.code.optimize)
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const parseFuncCode = gen.toString()
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sourceCode = `${gen.scopeRefs(N.scope)}return ${parseFuncCode}`
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const makeParse = new Function(`${N.scope}`, sourceCode)
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const parse: (json: string) => unknown = makeParse(this.scope.get())
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this.scope.value(parseName, {ref: parse})
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sch.parse = parse
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} catch (e) {
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if (sourceCode) this.logger.error("Error compiling parser, function code:", sourceCode)
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delete sch.parse
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delete sch.parseName
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throw e
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} finally {
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this._compilations.delete(sch)
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}
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return sch
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}
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const undef = _`undefined`
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function parserFunction(cxt: ParseCxt): void {
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const {gen, parseName, char} = cxt
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gen.func(parseName, _`${N.json}, ${N.jsonPos}, ${N.jsonPart}`, false, () => {
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gen.let(N.data)
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gen.let(char)
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gen.assign(_`${parseName}.message`, undef)
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gen.assign(_`${parseName}.position`, undef)
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gen.assign(N.jsonPos, _`${N.jsonPos} || 0`)
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gen.const(N.jsonLen, _`${N.json}.length`)
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parseCode(cxt)
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skipWhitespace(cxt)
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gen.if(N.jsonPart, () => {
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gen.assign(_`${parseName}.position`, N.jsonPos)
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gen.return(N.data)
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})
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gen.if(_`${N.jsonPos} === ${N.jsonLen}`, () => gen.return(N.data))
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jsonSyntaxError(cxt)
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})
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}
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function parseCode(cxt: ParseCxt): void {
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let form: JTDForm | undefined
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for (const key of jtdForms) {
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if (key in cxt.schema) {
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form = key
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break
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}
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}
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if (form) parseNullable(cxt, genParse[form])
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else parseEmpty(cxt)
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}
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const parseBoolean = parseBooleanToken(true, parseBooleanToken(false, jsonSyntaxError))
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function parseNullable(cxt: ParseCxt, parseForm: GenParse): void {
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const {gen, schema, data} = cxt
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if (!schema.nullable) return parseForm(cxt)
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tryParseToken(cxt, "null", parseForm, () => gen.assign(data, null))
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}
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function parseElements(cxt: ParseCxt): void {
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const {gen, schema, data} = cxt
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parseToken(cxt, "[")
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const ix = gen.let("i", 0)
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gen.assign(data, _`[]`)
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parseItems(cxt, "]", () => {
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const el = gen.let("el")
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parseCode({...cxt, schema: schema.elements, data: el})
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gen.assign(_`${data}[${ix}++]`, el)
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})
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}
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function parseValues(cxt: ParseCxt): void {
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const {gen, schema, data} = cxt
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parseToken(cxt, "{")
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gen.assign(data, _`{}`)
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parseItems(cxt, "}", () => parseKeyValue(cxt, schema.values))
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}
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function parseItems(cxt: ParseCxt, endToken: string, block: () => void): void {
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tryParseItems(cxt, endToken, block)
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parseToken(cxt, endToken)
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}
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function tryParseItems(cxt: ParseCxt, endToken: string, block: () => void): void {
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const {gen} = cxt
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gen.for(_`;${N.jsonPos}<${N.jsonLen} && ${jsonSlice(1)}!==${endToken};`, () => {
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block()
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tryParseToken(cxt, ",", () => gen.break(), hasItem)
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})
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function hasItem(): void {
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tryParseToken(cxt, endToken, () => {}, jsonSyntaxError)
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}
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}
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function parseKeyValue(cxt: ParseCxt, schema: SchemaObject): void {
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const {gen} = cxt
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const key = gen.let("key")
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parseString({...cxt, data: key})
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parseToken(cxt, ":")
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parsePropertyValue(cxt, key, schema)
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}
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function parseDiscriminator(cxt: ParseCxt): void {
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const {gen, data, schema} = cxt
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const {discriminator, mapping} = schema
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parseToken(cxt, "{")
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gen.assign(data, _`{}`)
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const startPos = gen.const("pos", N.jsonPos)
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const value = gen.let("value")
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const tag = gen.let("tag")
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tryParseItems(cxt, "}", () => {
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const key = gen.let("key")
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parseString({...cxt, data: key})
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parseToken(cxt, ":")
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gen.if(
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_`${key} === ${discriminator}`,
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() => {
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parseString({...cxt, data: tag})
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gen.assign(_`${data}[${key}]`, tag)
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gen.break()
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},
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() => parseEmpty({...cxt, data: value}) // can be discarded/skipped
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)
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})
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gen.assign(N.jsonPos, startPos)
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gen.if(_`${tag} === undefined`)
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parsingError(cxt, str`discriminator tag not found`)
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for (const tagValue in mapping) {
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gen.elseIf(_`${tag} === ${tagValue}`)
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parseSchemaProperties({...cxt, schema: mapping[tagValue]}, discriminator)
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}
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gen.else()
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parsingError(cxt, str`discriminator value not in schema`)
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gen.endIf()
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}
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function parseProperties(cxt: ParseCxt): void {
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const {gen, data} = cxt
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parseToken(cxt, "{")
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gen.assign(data, _`{}`)
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parseSchemaProperties(cxt)
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}
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function parseSchemaProperties(cxt: ParseCxt, discriminator?: string): void {
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const {gen, schema, data} = cxt
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const {properties, optionalProperties, additionalProperties} = schema
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parseItems(cxt, "}", () => {
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const key = gen.let("key")
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parseString({...cxt, data: key})
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parseToken(cxt, ":")
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gen.if(false)
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parseDefinedProperty(cxt, key, properties)
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parseDefinedProperty(cxt, key, optionalProperties)
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if (discriminator) {
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gen.elseIf(_`${key} === ${discriminator}`)
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const tag = gen.let("tag")
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parseString({...cxt, data: tag}) // can be discarded, it is already assigned
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}
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gen.else()
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if (additionalProperties) {
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parseEmpty({...cxt, data: _`${data}[${key}]`})
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} else {
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parsingError(cxt, str`property ${key} not allowed`)
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}
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gen.endIf()
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})
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if (properties) {
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const hasProp = hasPropFunc(gen)
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const allProps: Code = and(
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...Object.keys(properties).map((p): Code => _`${hasProp}.call(${data}, ${p})`)
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)
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gen.if(not(allProps), () => parsingError(cxt, str`missing required properties`))
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}
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}
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function parseDefinedProperty(cxt: ParseCxt, key: Name, schemas: SchemaObjectMap = {}): void {
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const {gen} = cxt
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for (const prop in schemas) {
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gen.elseIf(_`${key} === ${prop}`)
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parsePropertyValue(cxt, key, schemas[prop] as SchemaObject)
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}
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}
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function parsePropertyValue(cxt: ParseCxt, key: Name, schema: SchemaObject): void {
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parseCode({...cxt, schema, data: _`${cxt.data}[${key}]`})
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}
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function parseType(cxt: ParseCxt): void {
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const {gen, schema, data, self} = cxt
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switch (schema.type) {
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case "boolean":
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parseBoolean(cxt)
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break
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case "string":
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parseString(cxt)
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break
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case "timestamp": {
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parseString(cxt)
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const vts = useFunc(gen, validTimestamp)
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const {allowDate, parseDate} = self.opts
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const notValid = allowDate ? _`!${vts}(${data}, true)` : _`!${vts}(${data})`
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const fail: Code = parseDate
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? or(notValid, _`(${data} = new Date(${data}), false)`, _`isNaN(${data}.valueOf())`)
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: notValid
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gen.if(fail, () => parsingError(cxt, str`invalid timestamp`))
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break
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}
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case "float32":
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case "float64":
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parseNumber(cxt)
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break
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default: {
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const t = schema.type as IntType
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if (!self.opts.int32range && (t === "int32" || t === "uint32")) {
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parseNumber(cxt, 16) // 2 ** 53 - max safe integer
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if (t === "uint32") {
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gen.if(_`${data} < 0`, () => parsingError(cxt, str`integer out of range`))
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}
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} else {
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const [min, max, maxDigits] = intRange[t]
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parseNumber(cxt, maxDigits)
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gen.if(_`${data} < ${min} || ${data} > ${max}`, () =>
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parsingError(cxt, str`integer out of range`)
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)
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}
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}
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}
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}
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function parseString(cxt: ParseCxt): void {
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parseToken(cxt, '"')
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parseWith(cxt, parseJsonString)
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}
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function parseEnum(cxt: ParseCxt): void {
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const {gen, data, schema} = cxt
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const enumSch = schema.enum
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parseToken(cxt, '"')
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// TODO loopEnum
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gen.if(false)
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for (const value of enumSch) {
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const valueStr = JSON.stringify(value).slice(1) // remove starting quote
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gen.elseIf(_`${jsonSlice(valueStr.length)} === ${valueStr}`)
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gen.assign(data, str`${value}`)
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gen.add(N.jsonPos, valueStr.length)
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}
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gen.else()
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jsonSyntaxError(cxt)
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gen.endIf()
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}
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function parseNumber(cxt: ParseCxt, maxDigits?: number): void {
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const {gen} = cxt
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skipWhitespace(cxt)
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gen.if(
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_`"-0123456789".indexOf(${jsonSlice(1)}) < 0`,
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() => jsonSyntaxError(cxt),
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() => parseWith(cxt, parseJsonNumber, maxDigits)
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)
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}
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function parseBooleanToken(bool: boolean, fail: GenParse): GenParse {
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return (cxt) => {
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const {gen, data} = cxt
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tryParseToken(
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cxt,
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`${bool}`,
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() => fail(cxt),
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() => gen.assign(data, bool)
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)
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}
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}
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function parseRef(cxt: ParseCxt): void {
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const {gen, self, definitions, schema, schemaEnv} = cxt
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const {ref} = schema
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const refSchema = definitions[ref]
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if (!refSchema) throw new MissingRefError(self.opts.uriResolver, "", ref, `No definition ${ref}`)
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if (!hasRef(refSchema)) return parseCode({...cxt, schema: refSchema})
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const {root} = schemaEnv
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const sch = compileParser.call(self, new SchemaEnv({schema: refSchema, root}), definitions)
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partialParse(cxt, getParser(gen, sch), true)
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}
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function getParser(gen: CodeGen, sch: SchemaEnv): Code {
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return sch.parse
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? gen.scopeValue("parse", {ref: sch.parse})
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: _`${gen.scopeValue("wrapper", {ref: sch})}.parse`
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}
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function parseEmpty(cxt: ParseCxt): void {
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parseWith(cxt, parseJson)
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}
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function parseWith(cxt: ParseCxt, parseFunc: {code: string}, args?: SafeExpr): void {
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partialParse(cxt, useFunc(cxt.gen, parseFunc), args)
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}
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function partialParse(cxt: ParseCxt, parseFunc: Name, args?: SafeExpr): void {
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const {gen, data} = cxt
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gen.assign(data, _`${parseFunc}(${N.json}, ${N.jsonPos}${args ? _`, ${args}` : nil})`)
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gen.assign(N.jsonPos, _`${parseFunc}.position`)
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gen.if(_`${data} === undefined`, () => parsingError(cxt, _`${parseFunc}.message`))
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}
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function parseToken(cxt: ParseCxt, tok: string): void {
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tryParseToken(cxt, tok, jsonSyntaxError)
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}
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function tryParseToken(cxt: ParseCxt, tok: string, fail: GenParse, success?: GenParse): void {
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const {gen} = cxt
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const n = tok.length
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skipWhitespace(cxt)
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gen.if(
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_`${jsonSlice(n)} === ${tok}`,
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() => {
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gen.add(N.jsonPos, n)
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success?.(cxt)
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},
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() => fail(cxt)
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)
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}
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function skipWhitespace({gen, char: c}: ParseCxt): void {
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gen.code(
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_`while((${c}=${N.json}[${N.jsonPos}],${c}===" "||${c}==="\\n"||${c}==="\\r"||${c}==="\\t"))${N.jsonPos}++;`
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)
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}
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function jsonSlice(len: number | Name): Code {
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return len === 1
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? _`${N.json}[${N.jsonPos}]`
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: _`${N.json}.slice(${N.jsonPos}, ${N.jsonPos}+${len})`
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}
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function jsonSyntaxError(cxt: ParseCxt): void {
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parsingError(cxt, _`"unexpected token " + ${N.json}[${N.jsonPos}]`)
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}
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function parsingError({gen, parseName}: ParseCxt, msg: Code): void {
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gen.assign(_`${parseName}.message`, msg)
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gen.assign(_`${parseName}.position`, N.jsonPos)
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gen.return(undef)
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}
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