mirror of
https://github.com/pikami/cosmium.git
synced 2024-11-29 08:57:30 +00:00
334 lines
9.4 KiB
Plaintext
334 lines
9.4 KiB
Plaintext
{
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package nosql
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import "github.com/pikami/cosmium/parsers"
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func makeSelectStmt(columns, table, whereClause interface{}, count interface{}, orderList interface{}) (parsers.SelectStmt, error) {
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selectStmt := parsers.SelectStmt{
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SelectItems: columns.([]parsers.SelectItem),
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Table: table.(parsers.Table),
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}
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if filters, ok := whereClause.(parsers.ComparisonExpression); ok {
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selectStmt.Filters = filters
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} else if filters, ok := whereClause.(parsers.LogicalExpression); ok {
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selectStmt.Filters = filters
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} else if filters, ok := whereClause.(parsers.Constant); ok {
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selectStmt.Filters = filters
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}
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if n, ok := count.(int); ok {
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selectStmt.Count = n
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}
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if orderExpressions, ok := orderList.([]parsers.OrderExpression); ok {
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selectStmt.OrderExpressions = orderExpressions
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}
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return selectStmt, nil
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}
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func makeSelectItem(name interface{}, path interface{}, selectItemType parsers.SelectItemType) (parsers.SelectItem, error) {
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ps := path.([]interface{})
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paths := make([]string, 1)
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paths[0] = name.(string)
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for _, p := range ps {
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paths = append(paths, p.(string))
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}
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return parsers.SelectItem{Path: paths, Type: selectItemType}, nil
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}
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func makeColumnList(column interface{}, other_columns interface{}) ([]parsers.SelectItem, error) {
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collsAsArray := other_columns.([]interface{})
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columnList := make([]parsers.SelectItem, len(collsAsArray) + 1)
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columnList[0] = column.(parsers.SelectItem)
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for i, v := range collsAsArray {
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if col, ok := v.(parsers.SelectItem); ok {
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columnList[i+1] = col
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}
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}
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return columnList, nil
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}
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func makeSelectArray(columns interface{}) (parsers.SelectItem, error) {
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return parsers.SelectItem{
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SelectItems: columns.([]parsers.SelectItem),
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Type: parsers.SelectItemTypeArray,
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}, nil
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}
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func makeSelectObject(field interface{}, other_fields interface{}) (parsers.SelectItem, error) {
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fieldsAsArray := other_fields.([]interface{})
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fieldsList := make([]parsers.SelectItem, len(fieldsAsArray)+1)
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fieldsList[0] = field.(parsers.SelectItem)
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for i, v := range fieldsAsArray {
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if col, ok := v.(parsers.SelectItem); ok {
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fieldsList[i+1] = col
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}
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}
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return parsers.SelectItem{
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SelectItems: fieldsList,
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Type: parsers.SelectItemTypeObject,
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}, nil
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}
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func makeOrderByClause(ex1 interface{}, others interface{}) ([]parsers.OrderExpression, error) {
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othersArray := others.([]interface{})
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orderList := make([]parsers.OrderExpression, len(othersArray)+1)
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orderList[0] = ex1.(parsers.OrderExpression)
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for i, v := range othersArray {
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if col, ok := v.(parsers.OrderExpression); ok {
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orderList[i+1] = col
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}
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}
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return orderList, nil
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}
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func makeOrderExpression(field interface{}, order interface{}) (parsers.OrderExpression, error) {
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value := parsers.OrderExpression{
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SelectItem: field.(parsers.SelectItem),
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Direction: parsers.OrderDirectionAsc,
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}
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if orderValue, ok := order.(parsers.OrderDirection); ok {
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value.Direction = orderValue
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}
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return value, nil
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}
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func joinStrings(array []interface{}) string {
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var stringsArray []string
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for _, elem := range array {
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str, ok := elem.(string)
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if !ok {
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continue
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}
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stringsArray = append(stringsArray, str)
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}
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return strings.Join(stringsArray, "")
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}
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func combineExpressions(ex1 interface{}, exs interface{}, operation parsers.LogicalExpressionType) (interface{}, error) {
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if exs == nil || len(exs.([]interface{})) < 1 {
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return ex1, nil
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}
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return parsers.LogicalExpression{
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Expressions: append([]interface{}{ex1}, exs.([]interface{})...),
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Operation: operation,
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}, nil
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}
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}
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Input <- selectStmt:SelectStmt {
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return selectStmt, nil
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}
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SelectStmt <- Select ws topClause:TopClause? ws columns:Selection ws
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From ws table:TableName ws
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whereClause:(ws Where ws condition:Condition { return condition, nil })?
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orderByClause:OrderByClause? {
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return makeSelectStmt(columns, table, whereClause, topClause, orderByClause)
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}
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TopClause <- Top ws count:Integer {
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return count, nil
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}
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Selection <- SelectValueSpec / ColumnList / SelectAsterisk
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SelectAsterisk <- "*" {
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selectItem, _ := makeSelectItem("c", make([]interface{}, 0), parsers.SelectItemTypeField)
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selectItem.IsTopLevel = true
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return makeColumnList(selectItem, make([]interface{}, 0))
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}
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ColumnList <- column:SelectItem other_columns:(ws "," ws coll:SelectItem {return coll, nil })* {
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return makeColumnList(column, other_columns)
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}
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SelectValueSpec <- "VALUE"i ws column:SelectItem {
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selectItem := column.(parsers.SelectItem)
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selectItem.IsTopLevel = true
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return makeColumnList(selectItem, make([]interface{}, 0))
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}
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TableName <- key:Identifier {
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return parsers.Table{Value: key.(string)}, nil
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}
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SelectArray <- "[" ws columns:ColumnList ws "]" {
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return makeSelectArray(columns)
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}
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SelectObject <- "{" ws field:SelectObjectField ws other_fields:(ws "," ws coll:SelectObjectField {return coll, nil })* ws "}" {
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return makeSelectObject(field, other_fields)
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}
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SelectObjectField <- name:(Identifier / "\"" key:Identifier "\"" { return key, nil }) ws ":" ws selectItem:SelectItem {
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item := selectItem.(parsers.SelectItem)
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item.Alias = name.(string)
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return item, nil
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}
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SelectProperty <- name:Identifier path:(DotFieldAccess / ArrayFieldAccess)* {
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return makeSelectItem(name, path, parsers.SelectItemTypeField)
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}
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SelectItem <- selectItem:(Literal / StringEqualsExpression / SelectArray / SelectObject / SelectProperty) asClause:AsClause? {
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var itemResult parsers.SelectItem
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switch typedValue := selectItem.(type) {
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case parsers.SelectItem:
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itemResult = typedValue
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case parsers.Constant:
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itemResult = parsers.SelectItem{
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Type: parsers.SelectItemTypeConstant,
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Value: typedValue,
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}
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case parsers.FunctionCall:
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itemResult = parsers.SelectItem{
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Type: parsers.SelectItemTypeFunctionCall,
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Value: typedValue,
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}
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}
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if aliasValue, ok := asClause.(string); ok {
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itemResult.Alias = aliasValue
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}
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return itemResult, nil
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}
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AsClause <- ws As ws alias:Identifier { return alias, nil }
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DotFieldAccess <- "." id:Identifier {
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return id, nil
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}
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ArrayFieldAccess <- "[\"" id:Identifier "\"]" {
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return id, nil
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}
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Identifier <- [a-zA-Z_][a-zA-Z0-9_]* {
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return string(c.text), nil
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}
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Condition <- expression:OrExpression {
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return expression, nil
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}
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OrExpression <- ex1:AndExpression ex2:(ws Or ws ex:AndExpression { return ex, nil })* {
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return combineExpressions(ex1, ex2, parsers.LogicalExpressionTypeOr)
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}
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AndExpression <- ex1:ComparisonExpression ex2:(ws And ws ex:ComparisonExpression { return ex, nil })* {
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return combineExpressions(ex1, ex2, parsers.LogicalExpressionTypeAnd)
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}
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ComparisonExpression <- "(" ws ex:OrExpression ws ")" { return ex, nil }
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/ left:SelectItem ws op:ComparisonOperator ws right:SelectItem {
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return parsers.ComparisonExpression{Left:left,Right:right,Operation:string(op.([]uint8))}, nil
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} / ex:BooleanLiteral { return ex, nil }
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OrderByClause <- OrderBy ws ex1:OrderExpression others:(ws "," ws ex:OrderExpression { return ex, nil })* {
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return makeOrderByClause(ex1, others)
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}
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OrderExpression <- field:SelectProperty ws order:OrderDirection? {
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return makeOrderExpression(field, order)
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}
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OrderDirection <- ("ASC"i / "DESC"i) {
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if strings.EqualFold(string(c.text), "DESC") {
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return parsers.OrderDirectionDesc, nil
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}
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return parsers.OrderDirectionAsc, nil
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}
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Select <- "SELECT"i
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Top <- "TOP"i
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As <- "AS"i
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From <- "FROM"i
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Where <- "WHERE"i
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And <- "AND"i
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Or <- "OR"i
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OrderBy <- "ORDER"i ws "BY"i
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ComparisonOperator <- "=" / "!=" / "<" / "<=" / ">" / ">=" {
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return string(c.text), nil
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}
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StringEquals <- "STRINGEQUALS"i
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Literal <- FloatLiteral / IntegerLiteral / StringLiteral / BooleanLiteral / ParameterConstant / NullConstant
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ParameterConstant <- "@" Identifier {
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return parsers.Constant{Type: parsers.ConstantTypeParameterConstant, Value: string(c.text)}, nil
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}
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NullConstant <- "null" {
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return parsers.Constant{Value: nil}, nil
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}
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IntegerLiteral <- number:Integer {
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return parsers.Constant{Type: parsers.ConstantTypeInteger, Value: number.(int)}, nil
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}
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StringLiteral <- "\"" chars:StringCharacter* "\"" {
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return parsers.Constant{Type: parsers.ConstantTypeString,Value: joinStrings(chars.([]interface{}))}, nil
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}
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FloatLiteral <- [0-9]+"."[0-9]+ {
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floatValue, _ := strconv.ParseFloat(string(c.text), 64)
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return parsers.Constant{Type: parsers.ConstantTypeFloat, Value: floatValue}, nil
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}
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BooleanLiteral <- ("true"i / "false"i) {
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boolValue, _ := strconv.ParseBool(string(c.text))
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return parsers.Constant{Type: parsers.ConstantTypeBoolean, Value: boolValue}, nil
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}
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StringEqualsExpression <- StringEquals ws "(" ws ex1:SelectItem ws "," ws ex2:SelectItem ws ignoreCase:("," ws boolean:SelectItem { return boolean, nil })? ")" {
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return parsers.FunctionCall{Type: parsers.FunctionCallStringEquals, Arguments: []interface{}{ex1, ex2, ignoreCase}}, nil
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}
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Integer <- [0-9]+ {
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return strconv.Atoi(string(c.text))
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}
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StringCharacter <- !('"' / "\\") . { return string(c.text), nil }
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/ "\\" seq:EscapeSequenceCharacter { return seq, nil }
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EscapeSequenceCharacter <- char:EscapeCharacter
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EscapeCharacter <- "'"
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/ '"'
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/ "\\"
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/ "b" { return "\b", nil }
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/ "f" { return "\f", nil }
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/ "n" { return "\n", nil }
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/ "r" { return "\r", nil }
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/ "t" { return "\t", nil }
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non_escape_character <- !(escape_character) char:.
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{ return string(c.text), nil }
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ws <- [ \t\n\r]*
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EOF <- !.
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