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orm.v
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orm.v
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// Copyright (c) 2019-2024 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module parser
import v.ast
// select from User
// insert user into User returning id
fn (mut p Parser) sql_expr() ast.Expr {
tmp_inside_match := p.inside_match
p.inside_orm = true
p.inside_match = true
// `sql db {`
pos := p.tok.pos()
p.check_name()
db_expr := p.check_expr(0) or {
p.unexpected(prepend_msg: 'invalid expression:', expecting: 'database')
}
p.check(.lcbr)
// p.check(.key_select)
is_select := p.tok.kind == .key_select
is_insert := p.tok.lit == 'insert'
if !is_select && !is_insert {
p.error('expected "select" or "insert" in an ORM expression')
}
p.next()
// kind := if is_select { ast.SqlExprKind.select_ } else { ast.SqlExprKind.insert }
mut inserted_var := ''
mut is_count := false
if is_insert {
inserted_var = p.check_name()
into := p.check_name()
if into != 'into' {
p.error('expecting `into`')
}
} else if is_select {
is_count = p.check_name() == 'count'
}
mut typ := ast.void_type
if is_count {
n := p.check_name() // from
if n != 'from' {
p.error('expecting "from" in a "select count" ORM statement')
}
}
table_pos := p.tok.pos()
table_type := p.parse_type() // `User`
mut where_expr := ast.empty_expr
has_where := p.tok.kind == .name && p.tok.lit == 'where'
if has_where {
p.next()
where_expr = p.expr(0)
where_check_result := p.check_sql_where_expr_has_no_undefined_variables(&where_expr,
[])
if where_check_result is ast.NodeError {
return where_check_result
}
}
mut has_limit := false
mut limit_expr := ast.empty_expr
mut has_offset := false
mut offset_expr := ast.empty_expr
mut has_order := false
mut order_expr := ast.empty_expr
mut has_desc := false
if p.tok.kind == .name && p.tok.lit == 'order' {
p.check_name() // `order`
order_pos := p.tok.pos()
if p.tok.kind == .name && p.tok.lit == 'by' {
p.check_name() // `by`
} else {
return p.error_with_pos('use `order by` in ORM queries', order_pos)
}
has_order = true
order_expr = p.expr(0)
if p.tok.kind == .name && p.tok.lit == 'desc' {
p.check_name() // `desc`
has_desc = true
}
}
if p.tok.kind == .name && p.tok.lit == 'limit' {
p.check_name() // `limit`
has_limit = true
limit_expr = p.expr(0)
}
if p.tok.kind == .name && p.tok.lit == 'offset' {
p.check_name() // `offset`
has_offset = true
offset_expr = p.expr(0)
}
if is_count {
typ = ast.int_type
} else {
typ = ast.new_type(p.table.find_or_register_array(table_type))
}
p.check(.rcbr)
p.inside_match = false
p.inside_orm = false
or_expr := p.parse_sql_or_block()
p.inside_match = tmp_inside_match
return ast.SqlExpr{
is_count: is_count
is_insert: is_insert
typ: typ.set_flag(.result)
or_expr: or_expr
db_expr: db_expr
where_expr: where_expr
has_where: has_where
has_limit: has_limit
limit_expr: limit_expr
has_offset: has_offset
offset_expr: offset_expr
has_order: has_order
order_expr: order_expr
has_desc: has_desc
is_array: if is_count { false } else { true }
is_generated: false
inserted_var: inserted_var
pos: pos.extend(p.prev_tok.pos())
table_expr: ast.TypeNode{
typ: table_type
pos: table_pos
}
}
}
// insert user into User
// update User set nr_oders=nr_orders+1 where id == user_id
// delete
fn (mut p Parser) sql_stmt() ast.SqlStmt {
mut pos := p.tok.pos()
p.inside_orm = true
p.inside_match = true
defer {
p.inside_orm = false
p.inside_match = false
}
// `sql db {`
p.check_name()
db_expr := p.check_expr(0) or {
p.unexpected(prepend_msg: 'invalid expression:', expecting: 'database')
}
// println(typeof(db_expr))
p.check(.lcbr)
mut lines := []ast.SqlStmtLine{}
for p.tok.kind != .rcbr {
if p.tok.kind == .eof {
p.unexpected_with_pos(pos, got: 'eof, while parsing an SQL statement')
return ast.SqlStmt{}
}
lines << p.parse_sql_stmt_line()
}
p.next()
mut or_expr := p.parse_sql_or_block()
pos.last_line = p.prev_tok.line_nr
return ast.SqlStmt{
pos: pos.extend(p.prev_tok.pos())
db_expr: db_expr
lines: lines
or_expr: or_expr
}
}
fn (mut p Parser) parse_sql_or_block() ast.OrExpr {
mut stmts := []ast.Stmt{}
mut kind := ast.OrKind.absent
mut pos := p.tok.pos()
if p.tok.kind == .key_orelse {
kind = .block
stmts, pos = p.or_block(.with_err_var)
} else if p.tok.kind == .not {
kind = .propagate_result
p.next()
}
return ast.OrExpr{
stmts: stmts
kind: kind
pos: pos
}
}
fn (mut p Parser) parse_sql_stmt_line() ast.SqlStmtLine {
mut n := p.check_name() // insert
pos := p.tok.pos()
mut kind := ast.SqlStmtKind.insert
if n == 'delete' {
kind = .delete
} else if n == 'update' {
kind = .update
} else if n == 'create' {
kind = .create
table := p.check_name()
if table != 'table' {
p.error('expected `table` got `${table}`')
return ast.SqlStmtLine{}
}
typ := p.parse_type()
typ_pos := p.tok.pos()
return ast.SqlStmtLine{
kind: kind
pos: pos.extend(p.prev_tok.pos())
table_expr: ast.TypeNode{
typ: typ
pos: typ_pos
}
scope: p.scope
is_generated: false
}
} else if n == 'drop' {
kind = .drop
table := p.check_name()
if table != 'table' {
p.error('expected `table` got `${table}`')
return ast.SqlStmtLine{}
}
typ := p.parse_type()
typ_pos := p.tok.pos()
return ast.SqlStmtLine{
kind: kind
pos: pos.extend(p.prev_tok.pos())
table_expr: ast.TypeNode{
typ: typ
pos: typ_pos
}
is_generated: false
scope: p.scope
}
}
mut inserted_var := ''
mut table_type := ast.Type(0)
if kind != .delete {
if kind == .update {
table_type = p.parse_type()
} else if kind == .insert {
expr := p.expr(0)
if expr is ast.Ident {
inserted_var = expr.name
} else {
p.error('can only insert variables')
return ast.SqlStmtLine{}
}
}
}
n = p.check_name() // into
mut updated_columns := []string{}
mut update_exprs := []ast.Expr{cap: 5}
if kind == .insert && n != 'into' {
p.error('expecting `into`')
return ast.SqlStmtLine{}
} else if kind == .update {
if n != 'set' {
p.error('expecting `set`')
return ast.SqlStmtLine{}
}
for {
column := p.check_name()
updated_columns << column
p.check(.assign)
update_exprs << p.expr(0)
if p.tok.kind == .comma {
p.check(.comma)
} else {
break
}
}
} else if kind == .delete && n != 'from' {
p.error('expecting `from`')
return ast.SqlStmtLine{}
}
mut table_pos := p.tok.pos()
mut where_expr := ast.empty_expr
if kind == .insert {
table_pos = p.tok.pos()
table_type = p.parse_type()
} else if kind == .update {
p.check_sql_keyword('where') or { return ast.SqlStmtLine{} }
where_expr = p.expr(0)
} else if kind == .delete {
table_pos = p.tok.pos()
table_type = p.parse_type()
p.check_sql_keyword('where') or { return ast.SqlStmtLine{} }
where_expr = p.expr(0)
}
return ast.SqlStmtLine{
table_expr: ast.TypeNode{
typ: table_type
pos: table_pos
}
object_var: inserted_var
pos: pos
updated_columns: updated_columns
update_exprs: update_exprs
kind: kind
where_expr: where_expr
is_generated: false
scope: p.scope
}
}
fn (mut p Parser) check_sql_keyword(name string) ?bool {
if p.check_name() != name {
p.error('ORM: expecting `${name}`')
return none
}
return true
}
// check_sql_where_expr_has_no_undefined_variables recursively tries to find undefined variables in the right part of infix expressions.
fn (mut p Parser) check_sql_where_expr_has_no_undefined_variables(expr &ast.Expr, unacceptable_variable_names []string) ast.Expr {
if expr is ast.Ident {
if !p.scope.known_var(expr.name) {
p.check_undefined_variables(unacceptable_variable_names, expr) or {
return p.error_with_pos(err.msg(), expr.pos)
}
}
} else if expr is ast.InfixExpr {
if expr.left is ast.Ident && expr.right is ast.Ident {
return p.check_sql_where_expr_has_no_undefined_variables(expr.right, [
expr.left.str(),
])
}
left_check_result := p.check_sql_where_expr_has_no_undefined_variables(expr.left,
[])
if left_check_result is ast.NodeError {
return left_check_result
}
variable_names := if expr.left is ast.Ident { [expr.left.str()] } else { []string{} }
right_check_result := p.check_sql_where_expr_has_no_undefined_variables(expr.right,
variable_names)
if right_check_result is ast.NodeError {
return right_check_result
}
} else if expr is ast.ParExpr {
return p.check_sql_where_expr_has_no_undefined_variables(expr.expr, [])
}
return ast.empty_expr
}