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sqlgenerate.js
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sqlgenerate.js
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'use strict';
// Needed to allow its use in older versions of Node and Browsers.
import 'babel-polyfill';
import {map, join, head, compose, curry, toUpper, prop, equals, isEmpty, F, isArrayLike, concat, __, pluck, contains} from 'ramda';
import {} from 'underscore.string.fp';
const INDENT = '\t';
const LINE_END = '\n';
// This allows calling a function recursivly based on node type. Some of the
// nodes have non-standard types and so we need to modify how we call the
// Generator.
const recurse = curry((Generator, n) => {
switch (n.type) {
case 'function':
return Generator['function'](n);
case 'module':
return Generator.module(n);
case 'assignment':
return Generator.assignment(n);
case 'event':
return Generator.event(n);
default:
return Generator[n.type][n.variant](n);
}
});
const mapr = compose(map, recurse);
const datatype = (n) => n.variant;
const returnNewLine = join('\n');
const joinList = join(', ');
const terminateStatements = map(concat(__, ';'));
const containsSelect = (s) => (s.indexOf('SELECT') !== -1);
const isOfFormat = (n) => compose(equals(n), prop('format'));
var Generator = {
assignment : (n) => {
const recurser = recurse(Generator);
const target = recurser(n.target);
const value = recurser(n.value);
return `${target} = ${value}`;
},
statement : {
list : (n) => {
const recourseOverList = mapr(Generator);
const statements = compose(returnNewLine, terminateStatements, recourseOverList);
return statements(n.statement);
},
select : (n) => {
const recurser = recurse(Generator);
const recourseList = mapr(Generator);
const argsList = compose(joinList, recourseList);
var str = [''];
if (n.with) {
const withS = recourseList(n.with);
const isRecursive = (n) => isArrayLike(n) ? compose(contains('recursive'), pluck('variant'))(n) : F;
const w = isRecursive(n.with) ? 'WITH RECURSIVE' : 'WITH';
str.push(`${w} ${withS}${LINE_END}`);
}
str.push('SELECT ');
if (n.result) {
const results = argsList(n.result);
str.push(`${results}${LINE_END}`);
}
if (n.from) {
const from = recurser(n.from);
str.push(`${INDENT}FROM (${from})${LINE_END}`);
}
if (n.where) {
const where = recurser(head(n.where));
str.push(`${INDENT}WHERE ${where}${LINE_END}`);
}
if (n.group) {
const group = recurser(n.group);
str.push(`${INDENT}GROUP BY ${group}${LINE_END}`);
}
if (n.having) {
const having = recurser(n.having);
str.push(`${INDENT}HAVING ${having}${LINE_END}`);
}
if (n.order) {
const order = recurser(head(n.order));
str.push(`${INDENT}ORDER BY ${order}${LINE_END}`);
}
if (n.limit) {
const limit = recurser(n.limit);
str.push(`${INDENT}${limit}`);
}
return str.join('');
},
compound : (n) => {
const statement = recurse(Generator)(n.statement);
const compound = mapr(Generator)(n.compound);
return `${statement}${compound}`;
},
create : (n) => {
const recurser = recurse(Generator);
const isCreateIndex = isOfFormat('index');
const isCreateTable = isOfFormat('table');
const isCreateView = isOfFormat('view');
const isCreateVirtual = isOfFormat('virtual');
const isCreateTrigger = isOfFormat('trigger');
if(isCreateTrigger(n)){
const m = mapr(Generator);
const target = recurser(n.target);
const by = n.by ? `FOR EACH ${n.by}` : '';
const event = recurser(n.event);
const on = recurser(n.on);
const action = compose(join(';\n'), m)(n.action);
const when = recurser(n.when);
const temporary = (!!n.temporary) ? 'TEMPORARY' : '';
const condition = (n.condition) ? m(n.condition) : '';
return `CREATE ${temporary} TRIGGER ${condition} ${target} ${event} ON ${on} ${by} WHEN ${when} BEGIN ${action}; END`;
}
if(isCreateVirtual(n)){
const target = recurser(n.target);
const result = recurser(n.result);
return `CREATE VIRTUAL TABLE ${target} USING ${result}`;
}
if(isCreateView(n)){
const viewName = recurser(n.target);
const result = recurser(n.result);
return `CREATE VIEW ${viewName}${LINE_END}AS ${result}`;
}
if (isCreateIndex(n)) {
const indexName = n.target.name;
const onColumns = recurser(n.on);
const where = recurser(head(n.where));
return `CREATE INDEX ${indexName}${LINE_END}ON ${onColumns}${LINE_END}WHERE ${where}`;
}
if (isCreateTable(n)) {
const tableName = recurse(Generator)(n.name);
const definitionsList = compose(join(`,${LINE_END}`), mapr(Generator));
const definitions = definitionsList(n.definition);
// Can probable be refactored to be a bit more elegant... :/
const defaultCreateSyntax = `CREATE TABLE ${tableName} (${LINE_END}${definitions}${LINE_END})`;
const createTableFromSelect = `CREATE TABLE ${tableName} AS${LINE_END}${definitions}${LINE_END}`;
return containsSelect(definitions) ? createTableFromSelect
: defaultCreateSyntax;
}
return ``;
},
insert : (n) => {
const recurser = recurse(Generator);
const into = recurser(n.into);
// This is an insert into default values
if (n.result.variant === 'default'){
return `INSERT INTO ${into}${LINE_END}DEFAULT VALUES`;
}
// This is an insert into select
if (n.result.variant === 'select'){
const result = recurser(n.result);
return `INSERT INTO ${into}${LINE_END}${result}`;
}
// Otherwise we build up the values to be inserted
const addBrackets = map((s) => `(${s})`);
const valuesList = compose(join(`,${LINE_END}`), addBrackets, mapr(Generator));
const result = valuesList(n.result);
return `INSERT INTO ${into}${LINE_END}VALUES ${result}`;
},
'delete' : (n) => {
const recurser = recurse(Generator);
var str = ['DELETE '];
if (n.from) {
const from = recurser(n.from);
str.push(`${INDENT}FROM ${from}${LINE_END}`);
}
if (n.where) {
const whereNode = head(n.where);
const where = recurser(whereNode);
str.push(`${INDENT}WHERE ${where}${LINE_END}`);
}
if (n.limit) {
const limit = recurser(n.limit);
str.push(`${INDENT}${limit}`);
}
return str.join('');
},
drop : (n) => {
const recurser = recurse(Generator);
const condition = (n.condition.length > 0) ? mapr(Generator)(n.condition) : '';
const target = recurser(n.target);
return `DROP ${n.format} ${condition} ${target}`;
},
update : (n) => {
const recurser = recurse(Generator);
const into = recurser(n.into);
const setS = mapr(Generator)(n.set);
var str = [`UPDATE ${into} SET ${setS}`];
if (n.where) {
const whereNode = head(n.where);
const where = recurser(whereNode);
str.push(`${INDENT}WHERE ${where}${LINE_END}`);
}
if (n.limit) {
const limit = recurser(n.limit);
str.push(`${INDENT}${limit}`);
}
return str.join('');
},
transaction : (n) => {
const isOfActionType = (type) => (action) => (action === type);
const isBegin = isOfActionType('begin');
const isRollback = isOfActionType('rollback');
if (isBegin(n.action)){
return `${n.action} ${n.defer} TRANSACTION`;
}
if (isRollback(n.action)){
return `ROLLBACK TRANSACTION TO SAVEPOINT ${n.savepoint.name}`;
}
return `COMMIT`;
},
release : (n) => {
const recurser = recurse(Generator);
const savepoint = recurser(n.target.savepoint);
return `RELEASE SAVEPOINT ${savepoint}`;
},
savepoint : (n) => {
const recurser = recurse(Generator);
const savepoint = recurser(n.target.savepoint);
return `SAVEPOINT ${savepoint}`;
}
},
compound : {
union : (n) => {
const statement = recurse(Generator)(n.statement);
return `${toUpper(n.variant)}${LINE_END}${statement}`;
},
get 'union all'(){
return this.union;
},
get 'except'(){
return this.union;
},
get 'intersect'(){
return this.union;
},
},
identifier : {
star : (n) => n.name,
table : (n) => {
const alias = (n.alias) ? `AS ${n.alias}` : '';
const index = (n.index) ? recurse(Generator)(n.index) : '';
return `\`${n.name}\` ${alias} ${index}`;
},
index : (n) => `INDEXED BY ${n.name}`,
column : (n) => {
const recurser = recurse(Generator);
const alias = (n.alias) ? `AS \`${n.alias}\`` : '';
const index = (n.index) ? recurser(n.index) : '';
return `\`${n.name}\` ${alias} ${index}`;
},
'function' : (n) => n.name,
expression : (n) => {
const m = mapr(Generator);
return `\`${n.name}\`(${m(n.columns)})`;
},
view : (n) => n.name,
savepoint : (n) => n.name,
trigger : (n) => `"${n.name}"`
},
literal : {
text : (n) => `'${n.value}'`,
decimal : (n) => `${n.value}`,
null : () => 'NULL'
},
expression : {
operation : (n) => {
const recurser = recurse(Generator);
const isUnaryOperation = isOfFormat('unary');
if(isUnaryOperation(n)){
const expression = recurser(n.expression);
const operator = (n.operator) ? `${n.operator}` : '';
const alias = (n.alias) ? `AS [${n.alias}]` : '';
return `${operator} ${expression} ${alias}`;
}
const isBetween = (n) => (n.operation === 'between');
const isExpression = (n) => (n.type === 'expression');
const side = (s) => {
const sideOp = recurser(n[s]);
return !isBetween(n) && (isExpression(n[s]) || containsSelect(sideOp)) ? `(${sideOp})` : sideOp;
};
const left = side('left');
const right = side('right');
return `${left} ${n.operation} ${right}`;
},
list : (n) => {
const argsList = compose(joinList, mapr(Generator));
return argsList(n.expression);
},
order : (n) => {
const recurser = recurse(Generator);
const expression = recurser(n.expression);
const direction = n.direction;
return `${expression} ${toUpper(direction)}`;
},
limit : (n) => {
const recurser = recurse(Generator);
const limit = recurser(n.start);
const offset = recurser(n.offset);
return `LIMIT ${limit}${LINE_END}${INDENT}OFFSET ${offset}`;
},
cast : (n) => {
const recurser = recurse(Generator);
const expression = recurser(n.expression);
const as = recurser(n.as);
const alias = (n.alias) ? `AS [${n.alias}]` : '';
return `CAST(${expression} AS ${as})${alias}`;
},
common : (n) => {
const recurser = recurse(Generator);
const expression = recurser(n.expression);
const target = recurser(n.target);
return `${target} AS (${expression})`;
},
'case' : (n) => {
const mapConditions = compose(join(LINE_END), mapr(Generator));
const conditions = mapConditions(n.expression);
const alias = (n.alias) ? `AS [${n.alias}]` : '';
return `CASE ${conditions} END ${alias}`;
},
recursive : (n) => {
const recurser = recurse(Generator);
const target = recurser(n.target);
const expression = recurser(n.expression);
return `${target} AS (${expression})`;
},
exists : (n) => n.operator
},
condition : {
when : (n) => {
const recurser = recurse(Generator);
const when = recurser(n.condition);
const then = recurser(n.consequent);
return `WHEN ${when} THEN ${then}`;
},
'else' : (n) => {
const recurser = recurse(Generator);
const elseS = recurser(n.consequent);
return `ELSE ${elseS}`;
},
'if' : (n) => {
const recurser = recurse(Generator);
const exists = recurser(n.condition);
return `IF ${exists}`;
}
},
'function' : (n) => {
const recurser = recurse(Generator);
const name = toUpper(recurser(n.name));
const args = recurser(n.args);
const alias = (n.alias) ? `AS \`${n.alias}\`` : '';
return `${name}(${args}) ${alias}`;
},
module : (n) => {
const recurser = recurse(Generator);
const args = recurser(n.args);
const alias = (n.alias) ? `AS \`${n.alias}\`` : '';
return `${n.name}(${args}) ${alias}`;
},
event : ({event, occurs, of}) => {
const processedOf = (of) ? `OF ${mapr(Generator)(of)}` : '';
return `${occurs} ${event} ${processedOf}`;
},
map : {
join : (n) => {
const recurser = recurse(Generator);
const source = recurser(n.source);
const sourceAlias = (n.source.alias)? n.source.alias : '';
const join = recurser(head(n.map));
// Its a select subquery
if (containsSelect(source)){
const subquery = `(${source}) AS ${sourceAlias} ${join}`;
return subquery;
}
// Its an inner join.
return `${source} ${join}`;
}
},
join : {
join : (n) => {
const recurser = recurse(Generator);
const source = recurser(n.source);
const constraint = recurser(n.constraint);
return `${INDENT}JOIN ${source}${LINE_END}${constraint}`;
},
'inner join' : (n) => {
const recurser = recurse(Generator);
const source = recurser(n.source);
const sourceAlias = (n.source.alias)? ` AS ${n.source.alias}` : '';
const constraint = recurser(n.constraint);
return `${INDENT}INNER JOIN (${source})${sourceAlias}${LINE_END}${constraint}`;
},
'left outer join' : (n) => {
const recurser = recurse(Generator);
const source = recurser(n.source);
const constraint = recurser(n.constraint);
return `${INDENT}LEFT OUTER JOIN ${source}${LINE_END}${constraint}`;
},
'cross join' : (n) => {
const recurser = recurse(Generator);
const source = recurser(n.source);
return `, ${source}`;
}
},
constraint : {
join : (n) => {
const isFormatUsing = isOfFormat('using');
const isFormatOn = isOfFormat('on');
const recurser = recurse(Generator);
if(isFormatOn(n)){
const on = recurser(n.on);
return `${INDENT}ON ${on}${LINE_END}`;
}
if(isFormatUsing(n)){
const using = mapr(Generator)(n.using.columns);
return `${INDENT}USING (${using})${LINE_END}`;
}
return '';
},
'primary key' : () => `PRIMARY KEY`,
'not null': () => `NOT NULL`,
unique : () => `UNIQUE`,
check : (n) => {
const check = recurse(Generator)(n.expression);
return `CHECK (${check})`;
},
'foreign key' : (n) => {
const recurser = recurse(Generator);
const ref = recurser(n.references);
return `REFERENCES ${ref}`;
},
'null' : () => 'NULL'
},
definition : {
column : (n) => {
const recurser = recurse(Generator);
const datatype = isArrayLike(n.datatype) ? mapr(Generator, n.datatype) : recurser(n.datatype);
const constraintsList = compose(join(' '), map(recurser));
const constraints = constraintsList(n.definition);
return `${n.name} ${datatype} ${constraints}`;
},
constraint : (n) => {
const recurser = recurse(Generator);
const checkConstraint = (type) => (n) => {
if (isEmpty(n)) { return F;}
const constraintType = compose(prop('variant'), head);
return equals(constraintType(n), type);
};
const isForeignKey = checkConstraint('foreign key');
const isPrimaryKey = checkConstraint('primary key');
if(isForeignKey(n.definition)){
const childKey = recurser(head(n.columns));
const parentKey = recurser(head(n.definition));
return `FOREIGN KEY (${childKey}) ${parentKey}`;
}
if(isPrimaryKey(n.definition)){
const field = recurser(head(n.columns));
const conflict = prop('conflict', head(n.definition));
return `PRIMARY KEY (${field}) ON CONFLICT ${conflict}`;
}
return recurser(head(n.definition));
}
},
datatype : {
int : datatype,
varchar : (n) => {
const arg = recurse(Generator)(n.args);
return `${n.variant}(${arg})`;
},
blob : datatype,
double : datatype,
int8 : datatype,
text : datatype,
tinyint : datatype,
smallint : datatype,
mediumint :datatype,
bigint : datatype,
int4 : datatype,
integer : datatype,
time : datatype,
timestamp : datatype,
datetime : datatype,
date : datatype,
boolean : datatype,
decimal : (n) => {
const arg = recurse(Generator)(n.args);
return `${n.variant}(${arg})`;
},
numeric : datatype,
real : datatype,
float : datatype,
'double precision' : datatype,
clob : (n) => {
const arg = recurse(Generator)(n.args);
return `${n.variant}(${arg})`;
},
longtext : datatype,
mediumtext : datatype,
tinytext : datatype,
char : (n) => {
const arg = recurse(Generator)(n.args);
return `${n.variant}(${arg})`;
},
nvarchar : (n) => {
const arg = recurse(Generator)(n.args);
return `${n.variant}(${arg})`;
}
}
};
module.exports = {
version : require('./package.json').version,
generate : (n) => Generator[n.type][n.variant](n)
};