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parameters.go
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parameters.go
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package rewrite
import (
"fmt"
"strings"
"github.com/sqlc-dev/sqlc/internal/config"
"github.com/sqlc-dev/sqlc/internal/source"
"github.com/sqlc-dev/sqlc/internal/sql/ast"
"github.com/sqlc-dev/sqlc/internal/sql/astutils"
"github.com/sqlc-dev/sqlc/internal/sql/named"
)
// Given an AST node, return the string representation of names
func flatten(root ast.Node) (string, bool) {
sw := &stringWalker{}
astutils.Walk(sw, root)
return sw.String, sw.IsConst
}
type stringWalker struct {
String string
IsConst bool
}
func (s *stringWalker) Visit(node ast.Node) astutils.Visitor {
if _, ok := node.(*ast.A_Const); ok {
s.IsConst = true
}
if n, ok := node.(*ast.String); ok {
s.String += n.Str
}
return s
}
func isNamedParamSignCast(node ast.Node) bool {
expr, ok := node.(*ast.A_Expr)
if !ok {
return false
}
_, cast := expr.Rexpr.(*ast.TypeCast)
return astutils.Join(expr.Name, ".") == "@" && cast
}
// paramFromFuncCall creates a param from sqlc.n?arg() calls return the
// parameter and whether the parameter name was specified a best guess as its
// "source" string representation (used for replacing this function call in the
// original SQL query)
func paramFromFuncCall(call *ast.FuncCall) (named.Param, string) {
paramName, isConst := flatten(call.Args)
// origName keeps track of how the parameter was specified in the source SQL
origName := paramName
if isConst {
origName = fmt.Sprintf("'%s'", paramName)
}
var param named.Param
switch call.Func.Name {
case "narg":
param = named.NewUserNullableParam(paramName)
case "slice":
param = named.NewSqlcSlice(paramName)
default:
param = named.NewParam(paramName)
}
// TODO: This code assumes that sqlc.arg(name) / sqlc.narg(name) is on a single line
// with no extraneous spaces (or any non-significant tokens for that matter)
// except between the function name and argument
funcName := call.Func.Schema + "." + call.Func.Name
spaces := ""
if call.Args != nil && len(call.Args.Items) > 0 {
leftParen := call.Args.Items[0].Pos() - 1
spaces = strings.Repeat(" ", leftParen-call.Location-len(funcName))
}
origText := fmt.Sprintf("%s%s(%s)", funcName, spaces, origName)
return param, origText
}
func NamedParameters(engine config.Engine, raw *ast.RawStmt, numbs map[int]bool, dollar bool) (*ast.RawStmt, *named.ParamSet, []source.Edit) {
foundFunc := astutils.Search(raw, named.IsParamFunc)
foundSign := astutils.Search(raw, named.IsParamSign)
hasNamedParameterSupport := engine != config.EngineMySQL
allParams := named.NewParamSet(numbs, hasNamedParameterSupport)
if len(foundFunc.Items)+len(foundSign.Items) == 0 {
return raw, allParams, nil
}
var edits []source.Edit
node := astutils.Apply(raw, func(cr *astutils.Cursor) bool {
node := cr.Node()
switch {
case named.IsParamFunc(node):
fun := node.(*ast.FuncCall)
param, origText := paramFromFuncCall(fun)
argn := allParams.Add(param)
cr.Replace(&ast.ParamRef{
Number: argn,
Location: fun.Location,
})
var replace string
if engine == config.EngineMySQL || engine == config.EngineSQLite || !dollar {
if param.IsSqlcSlice() {
// This sequence is also replicated in internal/codegen/golang.Field
// since it's needed during template generation for replacement
replace = fmt.Sprintf(`/*SLICE:%s*/?`, param.Name())
} else {
if engine == config.EngineSQLite {
replace = fmt.Sprintf("?%d", argn)
} else {
replace = "?"
}
}
} else {
replace = fmt.Sprintf("$%d", argn)
}
edits = append(edits, source.Edit{
Location: fun.Location - raw.StmtLocation,
Old: origText,
New: replace,
})
return false
case isNamedParamSignCast(node):
expr := node.(*ast.A_Expr)
cast := expr.Rexpr.(*ast.TypeCast)
paramName, _ := flatten(cast.Arg)
param := named.NewParam(paramName)
argn := allParams.Add(param)
cast.Arg = &ast.ParamRef{
Number: argn,
Location: expr.Location,
}
cr.Replace(cast)
// TODO: This code assumes that @foo::bool is on a single line
var replace string
if engine == config.EngineMySQL || !dollar {
replace = "?"
} else if engine == config.EngineSQLite {
replace = fmt.Sprintf("?%d", argn)
} else {
replace = fmt.Sprintf("$%d", argn)
}
edits = append(edits, source.Edit{
Location: expr.Location - raw.StmtLocation,
Old: fmt.Sprintf("@%s", paramName),
New: replace,
})
return false
case named.IsParamSign(node):
expr := node.(*ast.A_Expr)
paramName, _ := flatten(expr.Rexpr)
param := named.NewParam(paramName)
argn := allParams.Add(param)
cr.Replace(&ast.ParamRef{
Number: argn,
Location: expr.Location,
})
// TODO: This code assumes that @foo is on a single line
var replace string
if engine == config.EngineMySQL || !dollar {
replace = "?"
} else if engine == config.EngineSQLite {
replace = fmt.Sprintf("?%d", argn)
} else {
replace = fmt.Sprintf("$%d", argn)
}
edits = append(edits, source.Edit{
Location: expr.Location - raw.StmtLocation,
Old: fmt.Sprintf("@%s", paramName),
New: replace,
})
return false
default:
return true
}
}, nil)
return node.(*ast.RawStmt), allParams, edits
}