94 lines
2.3 KiB
Markdown
94 lines
2.3 KiB
Markdown
# dt-sql-parser-semantic-analyse-plugin
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A [dt-sql-parser](https://github.com/DTStack/dt-sql-parser) plugin with semantic result. [Theory(zh-CN)](https://github.com/Kijin-Seija/dt-sql-parser-analyse-demo).
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## Installation
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```
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npm install dt-sql-parser-semantic-analyse-plugin
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```
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## Quick Usage
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```typescript
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const myPlugin = new DtSqlParserSemAnalysePlugin()
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const sql = 'SELECT a| FROM t'
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const caretColumn = sql.indexOf('|') + 1
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const result = myPlugin.parse(sql.replace('|', ''), { lineNumber: 1, columnNumber: caretColumn })
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console.log(result)
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```
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This will use a postgresql Parser and build-in rules/preprocessors
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## Add a Rule Chain
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```typescript
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import { PostgresSQL } from 'dt-sql-parser'
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import { PostgreSQLParser } from 'dt-sql-parser/dist/lib/pgsql/PostgreSQLParser'
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const myPlugin = new DtSqlParserSemAnalysePlugin({
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parse: {
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parser: new PostgresSQL()
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alias: {
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selectstmt: 'selectStatement',
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target_el: 'target_label'
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}
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stmts: [
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'selectstmt'
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],
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entities: [
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'column_name'
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],
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rules: {
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'select_columns': [
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PostgreSQLParser.RULE_insertstmt,
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PostgreSQLParser.RULE_column_name
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]
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}
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}
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})
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const sql = 'SELECT a| FROM t'
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const caretColumn = sql.indexOf('|') + 1
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const result = myPlugin.parse(sql.replace('|', ''), { lineNumber: 1, columnNumber: caretColumn })
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console.log(result)
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```
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**Notice: A rule must start with a/an statement/entity and stop with an entity. You should add a node keywords(keyword is in your parser with format: `RULE_[keyword]`) into stmts/entities before using it.**
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## Rule Chain Opeator
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You can set a negative number whose abs equals to a ruleIndex. That means exclude this rule.
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Example:
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```typescript
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select_target_alias: [
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PostgreSqlParser.RULE_target_el,
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-PostgreSqlParser.RULE_attr_name,
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PostgreSqlParser.RULE_collabel
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]
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```
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🚧 I will later work on `Operator.AND` and `Operator.OR`.
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## Alias
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Some node names in dt-sql-parser code are different from its antlr4's definition.
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You can find possible alias in https://github.com/DTStack/dt-sql-parser/blob/main/src/grammar/postgresql/PostgreSqlParser.g4, then add it into `alias` option.
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Example:
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## Add a preprocessor
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```typescript
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const myPlugin = new DtSqlParserSemAnalysePlugin({
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preprocessor: [
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(sql) => sql.toUpperCase()
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})
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```
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