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parse_field.go
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/
parse_field.go
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// Copyright (C) 2019 Storj Labs, Inc.
// Copyright (C) 2017 Space Monkey, Inc.
// See LICENSE for copying information.
package syntax
import (
"strconv"
"storj.io/dbx/ast"
"storj.io/dbx/errutil"
)
func parseField(node *tupleNode) (*ast.Field, error) {
field := new(ast.Field)
field.Pos = node.getPos()
field_name_token, err := node.consumeToken(Ident)
if err != nil {
return nil, err
}
field.Name = stringFromToken(field_name_token)
field.Type, field.Relation, err = parseFieldType(node)
if err != nil {
return nil, err
}
if field.Relation != nil {
err = parseRelation(node, field)
if err != nil {
return nil, err
}
return field, nil
}
attributes_list := node.consumeIfList()
if attributes_list != nil {
err := attributes_list.consumeAnyTuples(tupleCases{
"column": func(node *tupleNode) error {
if field.Column != nil {
return previouslyDefined(node.getPos(), "field", "column",
field.Column.Pos)
}
name_token, err := node.consumeToken(Ident)
if err != nil {
return err
}
field.Column = stringFromToken(name_token)
return nil
},
"nullable": tupleFlagField("field", "nullable",
&field.Nullable),
"autoupdate": tupleFlagField("field", "autoupdate",
&field.AutoUpdate),
"updatable": tupleFlagField("field", "updatable",
&field.Updatable),
"autoinsert": tupleFlagField("field", "autoinsert",
&field.AutoInsert),
"length": func(node *tupleNode) error {
if field.Length != nil {
return previouslyDefined(node.getPos(), "field", "length",
field.Length.Pos)
}
length_token, err := node.consumeToken(Int)
if err != nil {
return err
}
value, err := strconv.Atoi(length_token.text)
if err != nil {
return errutil.New(length_token.getPos(),
"unable to parse integer %q: %v",
length_token.text, err)
}
field.Length = intFromValue(length_token, value)
return nil
},
"default": func(node *tupleNode) error {
if field.Default != nil {
return previouslyDefined(node.getPos(), "field", "default",
field.Default.Pos)
}
value, err := node.consumeToken()
if err != nil {
return err
}
field.Default = stringFromValue(value, value.text)
return nil
},
})
if err != nil {
return nil, err
}
}
if node.assertEmpty() != nil {
invalid, _ := node.consume()
return nil, errutil.New(invalid.getPos(),
"expected list or end of tuple. got %s", invalid)
}
return field, nil
}
func parseFieldType(node *tupleNode) (*ast.FieldType, *ast.FieldRef, error) {
first, second, err := node.consumeDottedIdents()
if err != nil {
return nil, nil, err
}
if second == nil {
first.debugAssertToken(Ident)
field_type, ok := fieldTypeMapping[first.text]
if !ok {
return nil, nil, expectedKeyword(
first.getPos(), first.text, validFieldTypes()...)
}
return fieldTypeFromValue(first, field_type), nil, nil
}
return nil, &ast.FieldRef{
Pos: node.getPos(),
Model: stringFromToken(first),
Field: stringFromToken(second),
}, nil
}