@dpkit/table
Version:
Data Package implementation in TypeScript.
118 lines • 16.5 kB
JavaScript
import { col } from "nodejs-polars";
import { getPolarsSchema } from "../schema/index.js";
export async function inferSchema(table, options) {
const { sampleRows = 100, confidence = 0.9 } = options ?? {};
const schema = {
fields: [],
};
const typeMapping = createTypeMapping();
const regexMapping = createRegexMapping(options);
const sample = await table.head(sampleRows).collect();
const polarsSchema = getPolarsSchema(sample.schema);
const failureThreshold = sample.height - Math.floor(sample.height * confidence) || 1;
for (const polarsField of polarsSchema.fields) {
const name = polarsField.name;
const type = typeMapping[polarsField.type.variant] ?? "any";
let field = { name, type };
if (type === "string") {
for (const [regex, patch] of Object.entries(regexMapping)) {
const failures = sample
.filter(col(name).str.contains(regex).not())
.head(failureThreshold).height;
if (failures < failureThreshold) {
field = { ...field, ...patch };
break;
}
}
}
schema.fields.push(field);
}
return schema;
}
function createTypeMapping() {
const mapping = {
Array: "array",
Bool: "boolean",
Categorical: "string",
Date: "date",
Datetime: "datetime",
Decimal: "number",
Float32: "number",
Float64: "number",
Int16: "integer",
Int32: "integer",
Int64: "integer",
Int8: "integer",
List: "array",
Null: "any",
Object: "object",
String: "string",
Struct: "object",
Time: "time",
UInt16: "integer",
UInt32: "integer",
UInt64: "integer",
UInt8: "integer",
Utf8: "string",
};
return mapping;
}
function createRegexMapping(options) {
const { commaDecimal, monthFirst } = options ?? {};
const mapping = {
// Numeric
"^\\d+$": { type: "integer" },
"^[,\\d]+$": commaDecimal
? { type: "number" }
: { type: "integer", groupChar: "," },
"^\\d+\\.\\d+$": commaDecimal
? { type: "integer", groupChar: "." }
: { type: "number" },
"^[,\\d]+\\.\\d+$": { type: "number", groupChar: "," },
"^[.\\d]+\\,\\d+$": { type: "number", groupChar: ".", decimalChar: "," },
// Boolean
"^(true|True|TRUE|false|False|FALSE)$": { type: "boolean" },
// Date
"^\\d{4}-\\d{2}-\\d{2}$": { type: "date" },
"^\\d{4}/\\d{2}/\\d{2}$": { type: "date", format: "%Y/%m/%d" },
"^\\d{2}/\\d{2}/\\d{4}$": monthFirst
? { type: "date", format: "%m/%d/%Y" }
: { type: "date", format: "%d/%m/%Y" },
"^\\d{2}-\\d{2}-\\d{4}$": monthFirst
? { type: "date", format: "%m-%d-%Y" }
: { type: "date", format: "%d-%m-%Y" },
"^\\d{2}\\.\\d{2}\\.\\d{4}$": monthFirst
? { type: "date", format: "%m.%d.%Y" }
: { type: "date", format: "%d.%m.%Y" },
// Time
"^\\d{2}:\\d{2}:\\d{2}$": { type: "time" },
"^\\d{2}:\\d{2}$": { type: "time", format: "%H:%M" },
"^\\d{1,2}:\\d{2}:\\d{2}\\s*(am|pm|AM|PM)$": {
type: "time",
format: "%I:%M:%S %p",
},
"^\\d{1,2}:\\d{2}\\s*(am|pm|AM|PM)$": { type: "time", format: "%I:%M %p" },
"^\\d{2}:\\d{2}:\\d{2}[+-]\\d{2}:?\\d{2}$": { type: "time" },
// Datetime - ISO format
"^\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}Z?$": { type: "datetime" },
"^\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}[+-]\\d{2}:?\\d{2}$": {
type: "datetime",
},
"^\\d{4}-\\d{2}-\\d{2} \\d{2}:\\d{2}:\\d{2}$": {
type: "datetime",
format: "%Y-%m-%d %H:%M:%S",
},
"^\\d{2}/\\d{2}/\\d{4} \\d{2}:\\d{2}$": monthFirst
? { type: "datetime", format: "%m/%d/%Y %H:%M" }
: { type: "datetime", format: "%d/%m/%Y %H:%M" },
"^\\d{2}/\\d{2}/\\d{4} \\d{2}:\\d{2}:\\d{2}$": monthFirst
? { type: "datetime", format: "%m/%d/%Y %H:%M:%S" }
: { type: "datetime", format: "%d/%m/%Y %H:%M:%S" },
// Object
"^\\{": { type: "object" },
// Array
"^\\[": { type: "array" },
};
return mapping;
}
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{}\n  const schema: Schema = {\n    fields: [],\n  }\n\n  const typeMapping = createTypeMapping()\n  const regexMapping = createRegexMapping(options)\n\n  const sample = await table.head(sampleRows).collect()\n  const polarsSchema = getPolarsSchema(sample.schema)\n\n  const failureThreshold =\n    sample.height - Math.floor(sample.height * confidence) || 1\n\n  for (const polarsField of polarsSchema.fields) {\n    const name = polarsField.name\n    const type = typeMapping[polarsField.type.variant] ?? \"any\"\n\n    let field = { name, type }\n\n    if (type === \"string\") {\n      for (const [regex, patch] of Object.entries(regexMapping)) {\n        const failures = sample\n          .filter(col(name).str.contains(regex).not())\n          .head(failureThreshold).height\n        if (failures < failureThreshold) {\n          field = { ...field, ...patch }\n          break\n        }\n      }\n    }\n\n    schema.fields.push(field)\n  }\n\n  return schema\n}\n\nfunction createTypeMapping() {\n  const mapping: Record<string, Field[\"type\"]> = {\n    Array: \"array\",\n    Bool: \"boolean\",\n    Categorical: \"string\",\n    Date: \"date\",\n    Datetime: \"datetime\",\n    Decimal: \"number\",\n    Float32: \"number\",\n    Float64: \"number\",\n    Int16: \"integer\",\n    Int32: \"integer\",\n    Int64: \"integer\",\n    Int8: \"integer\",\n    List: \"array\",\n    Null: \"any\",\n    Object: \"object\",\n    String: \"string\",\n    Struct: \"object\",\n    Time: \"time\",\n    UInt16: \"integer\",\n    UInt32: \"integer\",\n    UInt64: \"integer\",\n    UInt8: \"integer\",\n    Utf8: \"string\",\n  }\n\n  return mapping\n}\n\nfunction createRegexMapping(options?: {\n  commaDecimal?: boolean\n  monthFirst?: boolean\n}) {\n  const { commaDecimal, monthFirst } = options ?? {}\n\n  const mapping: Record<string, Partial<Field>> = {\n    // Numeric\n    \"^\\\\d+$\": { type: \"integer\" },\n    \"^[,\\\\d]+$\": commaDecimal\n      ? { type: \"number\" }\n      : { type: \"integer\", groupChar: \",\" },\n    \"^\\\\d+\\\\.\\\\d+$\": commaDecimal\n      ? { type: \"integer\", groupChar: \".\" }\n      : { type: \"number\" },\n    \"^[,\\\\d]+\\\\.\\\\d+$\": { type: \"number\", groupChar: \",\" },\n    \"^[.\\\\d]+\\\\,\\\\d+$\": { type: \"number\", groupChar: \".\", decimalChar: \",\" },\n\n    // Boolean\n    \"^(true|True|TRUE|false|False|FALSE)$\": { type: \"boolean\" },\n\n    // Date\n    \"^\\\\d{4}-\\\\d{2}-\\\\d{2}$\": { type: \"date\" },\n    \"^\\\\d{4}/\\\\d{2}/\\\\d{2}$\": { type: \"date\", format: \"%Y/%m/%d\" },\n    \"^\\\\d{2}/\\\\d{2}/\\\\d{4}$\": monthFirst\n      ? { type: \"date\", format: \"%m/%d/%Y\" }\n      : { type: \"date\", format: \"%d/%m/%Y\" },\n    \"^\\\\d{2}-\\\\d{2}-\\\\d{4}$\": monthFirst\n      ? { type: \"date\", format: \"%m-%d-%Y\" }\n      : { type: \"date\", format: \"%d-%m-%Y\" },\n    \"^\\\\d{2}\\\\.\\\\d{2}\\\\.\\\\d{4}$\": monthFirst\n      ? { type: \"date\", format: \"%m.%d.%Y\" }\n      : { type: \"date\", format: \"%d.%m.%Y\" },\n\n    // Time\n    \"^\\\\d{2}:\\\\d{2}:\\\\d{2}$\": { type: \"time\" },\n    \"^\\\\d{2}:\\\\d{2}$\": { type: \"time\", format: \"%H:%M\" },\n    \"^\\\\d{1,2}:\\\\d{2}:\\\\d{2}\\\\s*(am|pm|AM|PM)$\": {\n      type: \"time\",\n      format: \"%I:%M:%S %p\",\n    },\n    \"^\\\\d{1,2}:\\\\d{2}\\\\s*(am|pm|AM|PM)$\": { type: \"time\", format: \"%I:%M %p\" },\n    \"^\\\\d{2}:\\\\d{2}:\\\\d{2}[+-]\\\\d{2}:?\\\\d{2}$\": { type: \"time\" },\n\n    // Datetime - ISO format\n    \"^\\\\d{4}-\\\\d{2}-\\\\d{2}T\\\\d{2}:\\\\d{2}:\\\\d{2}Z?$\": { type: \"datetime\" },\n    \"^\\\\d{4}-\\\\d{2}-\\\\d{2}T\\\\d{2}:\\\\d{2}:\\\\d{2}[+-]\\\\d{2}:?\\\\d{2}$\": {\n      type: \"datetime\",\n    },\n    \"^\\\\d{4}-\\\\d{2}-\\\\d{2} \\\\d{2}:\\\\d{2}:\\\\d{2}$\": {\n      type: \"datetime\",\n      format: \"%Y-%m-%d %H:%M:%S\",\n    },\n    \"^\\\\d{2}/\\\\d{2}/\\\\d{4} \\\\d{2}:\\\\d{2}$\": monthFirst\n      ? { type: \"datetime\", format: \"%m/%d/%Y %H:%M\" }\n      : { type: \"datetime\", format: \"%d/%m/%Y %H:%M\" },\n    \"^\\\\d{2}/\\\\d{2}/\\\\d{4} \\\\d{2}:\\\\d{2}:\\\\d{2}$\": monthFirst\n      ? { type: \"datetime\", format: \"%m/%d/%Y %H:%M:%S\" }\n      : { type: \"datetime\", format: \"%d/%m/%Y %H:%M:%S\" },\n\n    // Object\n    \"^\\\\{\": { type: \"object\" },\n\n    // Array\n    \"^\\\\[\": { type: \"array\" },\n  }\n\n  return mapping\n}\n"]}