rewrite: Move parameter rewrite to package (#499)

Author: kyleconroy

internal/dinosql/parser.go

@@ -11,18 +11,20 @@ import (
 	"strings"
 	"unicode"
 
+	"github.com/davecgh/go-spew/spew"
+	pg "github.com/lfittl/pg_query_go"
+	nodes "github.com/lfittl/pg_query_go/nodes"
+
 	"github.com/kyleconroy/sqlc/internal/catalog"
 	"github.com/kyleconroy/sqlc/internal/migrations"
 	"github.com/kyleconroy/sqlc/internal/multierr"
 	core "github.com/kyleconroy/sqlc/internal/pg"
 	"github.com/kyleconroy/sqlc/internal/postgres"
 	"github.com/kyleconroy/sqlc/internal/postgresql/ast"
+	"github.com/kyleconroy/sqlc/internal/postgresql/rewrite"
 	"github.com/kyleconroy/sqlc/internal/postgresql/validate"
+	"github.com/kyleconroy/sqlc/internal/source"
 	"github.com/kyleconroy/sqlc/internal/sql/sqlpath"
-
-	"github.com/davecgh/go-spew/spew"
-	pg "github.com/lfittl/pg_query_go"
-	nodes "github.com/lfittl/pg_query_go/nodes"
 )
 
 func keepSpew() {
@@ -344,7 +346,7 @@ func parseQuery(c core.Catalog, stmt nodes.Node, source string, rewriteParameter
 	}
 
 	// Re-write query AST
-	raw, namedParams, edits := rewriteNamedParameters(raw)
+	raw, namedParams, edits := rewrite.NamedParameters(raw)
 	rvs := rangeVars(raw.Stmt)
 	refs := findParameters(raw.Stmt)
 	if rewriteParameters {
@@ -403,10 +405,10 @@ func parseQuery(c core.Catalog, stmt nodes.Node, source string, rewriteParameter
 	}, nil
 }
 
-func rewriteNumberedParameters(refs []paramRef, raw nodes.RawStmt, sql string) ([]edit, error) {
-	edits := make([]edit, len(refs))
+func rewriteNumberedParameters(refs []paramRef, raw nodes.RawStmt, sql string) ([]source.Edit, error) {
+	edits := make([]source.Edit, len(refs))
 	for i, ref := range refs {
-		edits[i] = edit{
+		edits[i] = source.Edit{
 			Location: ref.ref.Location - raw.StmtLocation,
 			Old:      fmt.Sprintf("$%d", ref.ref.Number),
 			New:      "?",
@@ -431,13 +433,7 @@ func stripComments(sql string) (string, []string, error) {
 	return strings.Join(lines, "\n"), comments, s.Err()
 }
 
-type edit struct {
-	Location int
-	Old      string
-	New      string
-}
-
-func expand(qc *QueryCatalog, raw nodes.RawStmt) ([]edit, error) {
+func expand(qc *QueryCatalog, raw nodes.RawStmt) ([]source.Edit, error) {
 	list := ast.Search(raw, func(node nodes.Node) bool {
 		switch node.(type) {
 		case nodes.DeleteStmt:
@@ -452,7 +448,7 @@ func expand(qc *QueryCatalog, raw nodes.RawStmt) ([]edit, error) {
 	if len(list.Items) == 0 {
 		return nil, nil
 	}
-	var edits []edit
+	var edits []source.Edit
 	for _, item := range list.Items {
 		edit, err := expandStmt(qc, raw, item)
 		if err != nil {
@@ -470,7 +466,7 @@ func quoteIdent(ident string) string {
 	return ident
 }
 
-func expandStmt(qc *QueryCatalog, raw nodes.RawStmt, node nodes.Node) ([]edit, error) {
+func expandStmt(qc *QueryCatalog, raw nodes.RawStmt, node nodes.Node) ([]source.Edit, error) {
 	tables, err := sourceTables(qc, node)
 	if err != nil {
 		return nil, err
@@ -490,7 +486,7 @@ func expandStmt(qc *QueryCatalog, raw nodes.RawStmt, node nodes.Node) ([]edit, e
 		return nil, fmt.Errorf("outputColumns: unsupported node type: %T", n)
 	}
 
-	var edits []edit
+	var edits []source.Edit
 	for _, target := range targets.Items {
 		res, ok := target.(nodes.ResTarget)
 		if !ok {
@@ -548,7 +544,7 @@ func expandStmt(qc *QueryCatalog, raw nodes.RawStmt, node nodes.Node) ([]edit, e
 		for _, p := range parts {
 			old = append(old, quoteIdent(p))
 		}
-		edits = append(edits, edit{
+		edits = append(edits, source.Edit{
 			Location: res.Location - raw.StmtLocation,
 			Old:      strings.Join(old, "."),
 			New:      strings.Join(cols, ", "),
@@ -557,7 +553,7 @@ func expandStmt(qc *QueryCatalog, raw nodes.RawStmt, node nodes.Node) ([]edit, e
 	return edits, nil
 }
 
-func editQuery(raw string, a []edit) (string, error) {
+func editQuery(raw string, a []source.Edit) (string, error) {
 	if len(a) == 0 {
 		return raw, nil
 	}

internal/dinosql/parser_test.go

@@ -6,12 +6,12 @@ import (
 	"path"
 	"testing"
 
-	"github.com/kyleconroy/sqlc/internal/source"
-	"github.com/kyleconroy/sqlc/internal/sql/sqlpath"
-
 	"github.com/google/go-cmp/cmp"
 	pg "github.com/lfittl/pg_query_go"
 	nodes "github.com/lfittl/pg_query_go/nodes"
+
+	"github.com/kyleconroy/sqlc/internal/source"
+	"github.com/kyleconroy/sqlc/internal/sql/sqlpath"
 )
 
 const pluck = `
@@ -177,7 +177,7 @@ func TestExpand(t *testing.T) {
 	// pretend that foo has two columns, a and b
 	raw := `SELECT *, *, foo.* FROM foo`
 	expected := `SELECT a, b, a, b, foo.a, foo.b FROM foo`
-	edits := []edit{
+	edits := []source.Edit{
 		{7, "*", "a, b"},
 		{10, "*", "a, b"},
 		{13, "foo.*", "foo.a, foo.b"},

internal/dinosql/rewrite.go internal/postgresql/rewrite/parameters.gointernal/dinosql/rewrite.go renamed to internal/postgresql/rewrite/parameters.go

@@ -1,4 +1,4 @@
-package dinosql
+package rewrite
 
 import (
 	"fmt"
@@ -7,6 +7,7 @@ import (
 
 	"github.com/kyleconroy/sqlc/internal/postgresql"
 	"github.com/kyleconroy/sqlc/internal/postgresql/ast"
+	"github.com/kyleconroy/sqlc/internal/source"
 )
 
 // Given an AST node, return the string representation of names
@@ -40,7 +41,7 @@ func isNamedParamSignCast(node nodes.Node) bool {
 	return ast.Join(expr.Name, ".") == "@" && cast
 }
 
-func rewriteNamedParameters(raw nodes.RawStmt) (nodes.RawStmt, map[int]string, []edit) {
+func NamedParameters(raw nodes.RawStmt) (nodes.RawStmt, map[int]string, []source.Edit) {
 	foundFunc := ast.Search(raw, postgresql.IsNamedParamFunc)
 	foundSign := ast.Search(raw, postgresql.IsNamedParamSign)
 	if len(foundFunc.Items)+len(foundSign.Items) == 0 {
@@ -49,7 +50,7 @@ func rewriteNamedParameters(raw nodes.RawStmt) (nodes.RawStmt, map[int]string, [
 
 	args := map[string]int{}
 	argn := 0
-	var edits []edit
+	var edits []source.Edit
 	node := ast.Apply(raw, func(cr *ast.Cursor) bool {
 		node := cr.Node()
 		switch {
@@ -77,7 +78,7 @@ func rewriteNamedParameters(raw nodes.RawStmt) (nodes.RawStmt, map[int]string, [
 			} else {
 				old = fmt.Sprintf("sqlc.arg(%s)", param)
 			}
-			edits = append(edits, edit{
+			edits = append(edits, source.Edit{
 				Location: fun.Location - raw.StmtLocation,
 				Old:      old,
 				New:      fmt.Sprintf("$%d", args[param]),
@@ -104,7 +105,7 @@ func rewriteNamedParameters(raw nodes.RawStmt) (nodes.RawStmt, map[int]string, [
 				cr.Replace(cast)
 			}
 			// TODO: This code assumes that @foo::bool is on a single line
-			edits = append(edits, edit{
+			edits = append(edits, source.Edit{
 				Location: expr.Location - raw.StmtLocation,
 				Old:      fmt.Sprintf("@%s", param),
 				New:      fmt.Sprintf("$%d", args[param]),
@@ -128,7 +129,7 @@ func rewriteNamedParameters(raw nodes.RawStmt) (nodes.RawStmt, map[int]string, [
 				})
 			}
 			// TODO: This code assumes that @foo is on a single line
-			edits = append(edits, edit{
+			edits = append(edits, source.Edit{
 				Location: expr.Location - raw.StmtLocation,
 				Old:      fmt.Sprintf("@%s", param),
 				New:      fmt.Sprintf("$%d", args[param]),

internal/source/code.go

@@ -2,6 +2,12 @@ package source
 
 import "unicode"
 
+type Edit struct {
+	Location int
+	Old      string
+	New      string
+}
+
 func LineNumber(source string, head int) (int, int) {
 	// Calculate the true line and column number for a query, ignoring spaces
 	var comment bool