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feat(getSegments): custom highlighter (#57)
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‎README.md‎

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Original file line numberDiff line numberDiff line change
@@ -89,6 +89,41 @@ The following options may be passed to the `highlight` function.
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}
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```
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**Get segments for custom highlighter**
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```js
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const { getSegments } = require('sql-highlight')
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const sqlString = "SELECT `id`, `username` FROM `users` WHERE `email` = '[email protected]'"
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const segments = getSegments(sqlString)
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console.log(segments)
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```
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**Output:**
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```js
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[
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{ name: 'keyword', content: 'SELECT' },
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{ name: 'default', content: ' ' },
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{ name: 'string', content: '`id`' },
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{ name: 'special', content: ',' },
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{ name: 'default', content: ' ' },
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{ name: 'string', content: '`username`' },
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{ name: 'default', content: ' ' },
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{ name: 'keyword', content: 'FROM' },
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{ name: 'default', content: ' ' },
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{ name: 'string', content: '`users`' },
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{ name: 'default', content: ' ' },
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{ name: 'keyword', content: 'WHERE' },
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{ name: 'default', content: ' ' },
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{ name: 'string', content: '`email`' },
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{ name: 'default', content: ' ' },
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{ name: 'special', content: '=' },
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{ name: 'default', content: ' ' },
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{ name: 'string', content: "'[email protected]'" }
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]
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```
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## Contributing
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See the [contribution guidelines](CONTRIBUTING.md).

‎index.test.js‎

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Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
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const { highlight } = require('./lib')
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const { highlight, getSegments } = require('./lib')
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const OPTIONS = {
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colors: {
@@ -182,3 +182,49 @@ describe('html', () => {
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.toBe('<span class="sql-hl-keyword">SELECT</span> id <span class="sql-hl-keyword">FROM</span> users')
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})
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})
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describe('getSegments', () => {
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it('complex query', () => {
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expect(getSegments("SELECT COUNT(id), `id`, `username` FROM `users` WHERE `email` = '[email protected]' AND `foo` = 'BAR' OR 1=1"))
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.toStrictEqual([
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{ name: 'keyword', content: 'SELECT' },
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{ name: 'default', content: ' ' },
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{ name: 'function', content: 'COUNT' },
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{ name: 'bracket', content: '(' },
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{ name: 'default', content: 'id' },
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{ name: 'bracket', content: ')' },
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{ name: 'special', content: ',' },
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{ name: 'default', content: ' ' },
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{ name: 'string', content: '`id`' },
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{ name: 'special', content: ',' },
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{ name: 'default', content: ' ' },
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{ name: 'string', content: '`username`' },
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{ name: 'default', content: ' ' },
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{ name: 'keyword', content: 'FROM' },
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{ name: 'default', content: ' ' },
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{ name: 'string', content: '`users`' },
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{ name: 'default', content: ' ' },
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{ name: 'keyword', content: 'WHERE' },
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{ name: 'default', content: ' ' },
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{ name: 'string', content: '`email`' },
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{ name: 'default', content: ' ' },
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{ name: 'special', content: '=' },
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{ name: 'default', content: ' ' },
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{ name: 'string', content: "'[email protected]'" },
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{ name: 'default', content: ' ' },
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{ name: 'keyword', content: 'AND' },
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{ name: 'default', content: ' ' },
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{ name: 'string', content: '`foo`' },
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{ name: 'default', content: ' ' },
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{ name: 'special', content: '=' },
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{ name: 'default', content: ' ' },
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{ name: 'string', content: "'BAR'" },
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{ name: 'default', content: ' ' },
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{ name: 'keyword', content: 'OR' },
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{ name: 'default', content: ' ' },
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{ name: 'number', content: '1' },
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{ name: 'special', content: '=' },
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{ name: 'number', content: '1' }
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])
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})
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})

‎lib/index.d.ts‎

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Original file line numberDiff line numberDiff line change
@@ -12,6 +12,12 @@ declare module 'sql-highlight' {
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clear: string;
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};
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}
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export interface Segment {
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name: string;
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content: string;
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}
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export function getSegments(sqlString: string): Array<Segment>;
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export function highlight(sqlString: string, options?: HighlightOptions): string;
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}

‎lib/index.js‎

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Original file line numberDiff line numberDiff line change
@@ -18,6 +18,8 @@ const DEFAULT_OPTIONS = {
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const SPLIT_CHARS = '[^a-zA-Z_]'
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const DEFAULT_KEYWORD = 'default'
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const highlighters = [
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{
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name: 'keyword',
@@ -47,9 +49,7 @@ const highlighters = [
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}
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]
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function highlight (sqlString, options) {
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options = Object.assign({}, DEFAULT_OPTIONS, options)
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function getSegments (sqlString) {
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const matches = []
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for (const hl of highlighters) {
@@ -70,53 +70,72 @@ function highlight (sqlString, options) {
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}
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}
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const trimmedText = hl.trimEnd
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? text.substring(0, text.length - hl.trimEnd)
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: text
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matches.push({
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name: hl.name,
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start: match.index + boringLength,
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length: (hl.trimEnd ? text.substr(0, text.length - hl.trimEnd) : text).length
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length: trimmedText.length
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})
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}
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}
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const sortedMatches = matches.slice().sort((a, b) => a.start - b.start)
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// filter/exclude nested matches (matches within the last match)
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const filteredMatches = []
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const segments = []
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let upperBound = 0
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for (let i = 0; i < sortedMatches.length; i++) {
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if (sortedMatches[i].start >= upperBound) {
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filteredMatches.push(sortedMatches[i])
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upperBound = sortedMatches[i].start + sortedMatches[i].length
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}
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}
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93-
let highlighted = ''
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if (sortedMatches[i].start < upperBound) { break }
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95-
for (let i = 0; i < filteredMatches.length; i++) {
96-
const match = filteredMatches[i]
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const nextMatch = filteredMatches[i + 1]
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// If no match, add a default segment
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if (sortedMatches[i].start > upperBound) {
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segments.push({
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name: DEFAULT_KEYWORD,
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content: sqlString.substring(upperBound, sortedMatches[i].start)
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})
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}
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const stringMatch = sqlString.substr(match.start, match.length)
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segments.push({
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name: sortedMatches[i].name,
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content: sqlString.substring(
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sortedMatches[i].start,
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sortedMatches[i].start + sortedMatches[i].length
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)
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})
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upperBound = sortedMatches[i].start + sortedMatches[i].length
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}
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101-
if (options.html) {
102-
highlighted += `<span class="${options.classPrefix}${match.name}">`
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highlighted += stringMatch
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highlighted += '</span>'
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} else {
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highlighted += options.colors[match.name]
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highlighted += stringMatch
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highlighted += options.colors.clear
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}
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if (nextMatch) {
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highlighted += sqlString.substr(match.start + match.length, nextMatch.start - (match.start + match.length))
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} else if (sqlString.length > (match.start + match.length)) {
113-
highlighted += sqlString.substr(match.start + match.length)
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}
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if (upperBound < sqlString.length - 1) {
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segments.push({
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name: DEFAULT_KEYWORD,
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content: sqlString.substring(
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upperBound,
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upperBound + sqlString.length + 1
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)
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})
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}
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return segments
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}
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return highlighted
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function highlight (sqlString, options) {
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options = Object.assign({}, DEFAULT_OPTIONS, options)
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return getSegments(sqlString)
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.map(({ name, content }) => {
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if (name === DEFAULT_KEYWORD) {
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return content
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}
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if (options.html) {
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return `<span class="${options.classPrefix}${name}">${content}</span>`
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}
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return options.colors[name] + content + options.colors.clear
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})
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.join('')
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}
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module.exports = {
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getSegments,
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highlight
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}

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