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qwen/nodejs/node_modules/pg/lib/utils.js

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+'use strict'
+
+const defaults = require('./defaults')
+
+const util = require('util')
+const { isDate } = util.types || util // Node 8 doesn't have `util.types`
+
+function escapeElement(elementRepresentation) {
+  const escaped = elementRepresentation.replace(/\\/g, '\\\\').replace(/"/g, '\\"')
+
+  return '"' + escaped + '"'
+}
+
+// convert a JS array to a postgres array literal
+// uses comma separator so won't work for types like box that use
+// a different array separator.
+function arrayString(val) {
+  let result = '{'
+  for (let i = 0; i < val.length; i++) {
+    if (i > 0) {
+      result = result + ','
+    }
+    if (val[i] === null || typeof val[i] === 'undefined') {
+      result = result + 'NULL'
+    } else if (Array.isArray(val[i])) {
+      result = result + arrayString(val[i])
+    } else if (ArrayBuffer.isView(val[i])) {
+      let item = val[i]
+      if (!(item instanceof Buffer)) {
+        const buf = Buffer.from(item.buffer, item.byteOffset, item.byteLength)
+        if (buf.length === item.byteLength) {
+          item = buf
+        } else {
+          item = buf.slice(item.byteOffset, item.byteOffset + item.byteLength)
+        }
+      }
+      result += '\\\\x' + item.toString('hex')
+    } else {
+      result += escapeElement(prepareValue(val[i]))
+    }
+  }
+  result = result + '}'
+  return result
+}
+
+// converts values from javascript types
+// to their 'raw' counterparts for use as a postgres parameter
+// note: you can override this function to provide your own conversion mechanism
+// for complex types, etc...
+const prepareValue = function (val, seen) {
+  // null and undefined are both null for postgres
+  if (val == null) {
+    return null
+  }
+  if (typeof val === 'object') {
+    if (val instanceof Buffer) {
+      return val
+    }
+    if (ArrayBuffer.isView(val)) {
+      const buf = Buffer.from(val.buffer, val.byteOffset, val.byteLength)
+      if (buf.length === val.byteLength) {
+        return buf
+      }
+      return buf.slice(val.byteOffset, val.byteOffset + val.byteLength) // Node.js v4 does not support those Buffer.from params
+    }
+    if (isDate(val)) {
+      if (defaults.parseInputDatesAsUTC) {
+        return dateToStringUTC(val)
+      } else {
+        return dateToString(val)
+      }
+    }
+    if (Array.isArray(val)) {
+      return arrayString(val)
+    }
+
+    return prepareObject(val, seen)
+  }
+  return val.toString()
+}
+
+function prepareObject(val, seen) {
+  if (val && typeof val.toPostgres === 'function') {
+    seen = seen || []
+    if (seen.indexOf(val) !== -1) {
+      throw new Error('circular reference detected while preparing "' + val + '" for query')
+    }
+    seen.push(val)
+
+    return prepareValue(val.toPostgres(prepareValue), seen)
+  }
+  return JSON.stringify(val)
+}
+
+function dateToString(date) {
+  let offset = -date.getTimezoneOffset()
+
+  let year = date.getFullYear()
+  const isBCYear = year < 1
+  if (isBCYear) year = Math.abs(year) + 1 // negative years are 1 off their BC representation
+
+  let ret =
+    String(year).padStart(4, '0') +
+    '-' +
+    String(date.getMonth() + 1).padStart(2, '0') +
+    '-' +
+    String(date.getDate()).padStart(2, '0') +
+    'T' +
+    String(date.getHours()).padStart(2, '0') +
+    ':' +
+    String(date.getMinutes()).padStart(2, '0') +
+    ':' +
+    String(date.getSeconds()).padStart(2, '0') +
+    '.' +
+    String(date.getMilliseconds()).padStart(3, '0')
+
+  if (offset < 0) {
+    ret += '-'
+    offset *= -1
+  } else {
+    ret += '+'
+  }
+
+  ret += String(Math.floor(offset / 60)).padStart(2, '0') + ':' + String(offset % 60).padStart(2, '0')
+  if (isBCYear) ret += ' BC'
+  return ret
+}
+
+function dateToStringUTC(date) {
+  let year = date.getUTCFullYear()
+  const isBCYear = year < 1
+  if (isBCYear) year = Math.abs(year) + 1 // negative years are 1 off their BC representation
+
+  let ret =
+    String(year).padStart(4, '0') +
+    '-' +
+    String(date.getUTCMonth() + 1).padStart(2, '0') +
+    '-' +
+    String(date.getUTCDate()).padStart(2, '0') +
+    'T' +
+    String(date.getUTCHours()).padStart(2, '0') +
+    ':' +
+    String(date.getUTCMinutes()).padStart(2, '0') +
+    ':' +
+    String(date.getUTCSeconds()).padStart(2, '0') +
+    '.' +
+    String(date.getUTCMilliseconds()).padStart(3, '0')
+
+  ret += '+00:00'
+  if (isBCYear) ret += ' BC'
+  return ret
+}
+
+function normalizeQueryConfig(config, values, callback) {
+  // can take in strings or config objects
+  config = typeof config === 'string' ? { text: config } : config
+  if (values) {
+    if (typeof values === 'function') {
+      config.callback = values
+    } else {
+      config.values = values
+    }
+  }
+  if (callback) {
+    config.callback = callback
+  }
+  return config
+}
+
+// Ported from PostgreSQL 9.2.4 source code in src/interfaces/libpq/fe-exec.c
+const escapeIdentifier = function (str) {
+  return '"' + str.replace(/"/g, '""') + '"'
+}
+
+const escapeLiteral = function (str) {
+  let hasBackslash = false
+  let escaped = "'"
+
+  if (str == null) {
+    return "''"
+  }
+
+  if (typeof str !== 'string') {
+    return "''"
+  }
+
+  for (let i = 0; i < str.length; i++) {
+    const c = str[i]
+    if (c === "'") {
+      escaped += c + c
+    } else if (c === '\\') {
+      escaped += c + c
+      hasBackslash = true
+    } else {
+      escaped += c
+    }
+  }
+
+  escaped += "'"
+
+  if (hasBackslash === true) {
+    escaped = ' E' + escaped
+  }
+
+  return escaped
+}
+
+module.exports = {
+  prepareValue: function prepareValueWrapper(value) {
+    // this ensures that extra arguments do not get passed into prepareValue
+    // by accident, eg: from calling values.map(utils.prepareValue)
+    return prepareValue(value)
+  },
+  normalizeQueryConfig,
+  escapeIdentifier,
+  escapeLiteral,
+}