forked from gowade/wade
/
formatter.go
131 lines (112 loc) · 2.6 KB
/
formatter.go
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package main
import (
"fmt"
"io"
"log"
"os/exec"
)
func write(w io.Writer, content string) {
w.Write([]byte(content))
}
func writeCodeGofmt(w io.WriteCloser, file string, root *codeNode) {
write(w, Prelude)
emitCodeNaive(w, root)
w.Close()
cmd := exec.Command("go", "fmt", file)
out, err := cmd.CombinedOutput()
fmt.Printf(`Running "go fmt" on file "%v". Output: %v`+"\n", file, string(out))
if err != nil {
fmt.Println(`fuel requires that the standard go command is available. ` +
`Please make sure it works.`)
log.Fatal(err)
}
}
func emitCodeNaive(w io.Writer, node *codeNode) {
switch node.typ {
case StringCodeNode:
write(w, fmt.Sprintf(`%q`, node.code))
case NakedCodeNode:
write(w, node.code)
case FuncCallCodeNode:
write(w, node.code+"(")
for i, c := range node.children {
emitCodeNaive(w, c)
if i < len(node.children)-1 {
write(w, ",")
}
}
write(w, ")")
case SliceVarCodeNode:
panic("Unexpected case, something is wrong, please report this.")
case ElemListCodeNode, AppendListCodeNode:
handleElemListCN(w, node)
case VarDeclAreaCodeNode:
write(w, "\n")
for _, c := range node.children {
emitCodeNaive(w, c)
write(w, "\n")
}
case CompositeCodeNode, BlockCodeNode:
write(w, node.code+"{\n")
for _, c := range node.children {
emitCodeNaive(w, c)
if node.typ == CompositeCodeNode {
write(w, ",")
}
write(w, "\n")
}
write(w, "}")
}
}
func handleElemListCN(w io.Writer, node *codeNode) {
opening := ElementListOpener + "{\n"
closing := "}"
//isAppend := node.typ == AppendListCodeNode
// separate the list into parts to facilitate special constructs (for and if)
rparts := [][]*codeNode{node.children}
if len(node.children) > 1 {
rparts = [][]*codeNode{make([]*codeNode, 0)}
i := 0
for _, c := range node.children {
if c.typ == SliceVarCodeNode {
rparts = append(rparts, []*codeNode{c})
rparts = append(rparts, []*codeNode{})
i = len(rparts) - 1
} else {
rparts[i] = append(rparts[i], c)
}
}
}
parts := make([][]*codeNode, 0, len(rparts))
for _, part := range rparts {
if len(part) > 0 {
parts = append(parts, part)
}
}
write(w, node.code)
for i, part := range parts {
if i < len(parts)-1 {
write(w, "append(")
}
if len(part) == 1 && part[0].typ == SliceVarCodeNode {
write(w, part[0].code)
} else {
write(w, opening)
for i, c := range part {
emitCodeNaive(w, c)
if i < len(part)-1 {
write(w, ",\n")
}
}
write(w, closing)
}
if i < len(parts)-1 {
write(w, ", ")
}
}
if len(parts) > 1 {
for range parts[1:] {
write(w, "...)")
}
}
}