func pairsAux(L *lua.State) int {
L.CheckType(1, lua.LUA_TTABLE)
L.SetTop(2) // Create a 2nd argument if there isn't one.
if L.Next(1) != 0 {
return 2
}
L.PushNil()
return 1
}
// ProxyPairs implements Lua 5.2 'pairs' functions.
// It respects the __pairs metamethod.
//
// It is only useful for compatibility with Lua 5.1.
func ProxyPairs(L *lua.State) int {
// See Lua >=5.2 source code.
if L.GetMetaField(1, "__pairs") {
L.PushValue(1)
L.Call(1, 3)
return 3
}
L.CheckType(1, lua.LUA_TTABLE)
L.PushGoFunction(pairsAux)
L.PushValue(1)
L.PushNil()
return 3
}
func TableFormat(state *lua.State) int {
state.CheckType(1, lua.LUA_TTABLE)
state.CheckType(2, lua.LUA_TTABLE) // ( ??? -- tbl tblFields )
log.Println("Formatting a table by a table")
printStackTypes(state)
numFields := int(state.ObjLen(-1))
fields := make([]string, numFields)
maxFieldLen := make(map[string]int)
for i := 0; i < numFields; i++ {
state.RawGeti(-1, i+1) // ( tbl tblFields -- tbl tblFields strHeader )
fieldName := state.ToString(-1)
fields[i] = fieldName
maxFieldLen[fieldName] = len(fieldName)
state.Pop(1) // ( tbl tblFields strField -- tbl tblFields )
}
state.Pop(1) // ( tbl tblFields -- tbl )
log.Println("Slurped up the fields list (table #2)")
printStackTypes(state)
numRows := int(state.ObjLen(-1))
rows := make([]map[string]string, numRows)
for i := 0; i < numRows; i++ {
state.RawGeti(-1, i+1) // ( tbl -- tbl tblRow )
row := make(map[string]string)
for _, field := range fields {
state.PushString(field) // ( tbl tblRow -- tbl tblRow strField )
state.RawGet(-2) // ( tbl tblRow strField -- tbl tblRow tblField )
row[field] = state.ToString(-1)
if maxFieldLen[field] < len(row[field]) {
maxFieldLen[field] = len(row[field])
}
state.Pop(1) // ( tbl tblRow tblField -- tbl tblRow )
}
rows[i] = row
state.Pop(1) // ( tbl tblRow -- tbl )
}
state.Pop(1) // ( tbl -- )
log.Println("Slurped up the data table (table #1)")
printStackTypes(state)
// %5s %10s %13s
fmtStrings := make([]string, numFields)
for i, field := range fields {
fmtStrings[i] = fmt.Sprintf("%%-%ds", maxFieldLen[field])
}
fmtString := strings.Join(fmtStrings, " ")
log.Println("Figured out the format string:", fmtString)
rowStrings := make([]string, numRows+1)
rowFields := make([]interface{}, numFields)
for i, row := range rows {
for j, field := range fields {
rowFields[j] = row[field]
}
rowStrings[i+1] = fmt.Sprintf(fmtString, rowFields...)
}
for i := 0; i < numFields; i++ {
rowFields[i] = strings.Title(fields[i])
}
rowStrings[0] = fmt.Sprintf(fmtString, rowFields...)
log.Println("Yay formatted all the strings")
formattedTable := strings.Join(rowStrings, "\n")
state.PushString(formattedTable) // ( -- str )
log.Println("All done formatting this table!")
printStackTypes(state)
return 1
}