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/*
Copyright 2020 Kyle Gunger
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package texec
import (
"fmt"
"os"
)
/**
libtnsl module stub. Contains only parts of the io sub-module.
Parts included:
- io.print
- io.println
- io.open_file
- io.File API for file objects
Types included:
- tnsl.io.File
- string ({}charp)
- charp
- int
- float
- null
*/
// I really hope this works.
// Generic in-built types
var (
tFile = TType{Pre: []string{}, T: TArtifact{Path: []string{"tnsl", "io"}, Name: "File"}, Post: []string{}}
tString = TType{Pre: []string{"{}"}, T: TArtifact{Path: []string{}, Name:"charp"}, Post: []string{}}
tInt = TType{Pre: []string{}, T: TArtifact{Path: []string{}, Name:"int"}, Post: []string{}}
tFloat = TType{Pre: []string{}, T: TArtifact{Path: []string{}, Name:"float"}, Post: []string{}}
tCharp = TType{Pre: []string{}, T: TArtifact{Path: []string{}, Name:"charp"}, Post: []string{}}
tNull = TType{Pre: []string{}, T: TArtifact{Path: []string{}, Name: "null"}, Post: []string{}}
)
// tells if the stub supports a function
func tnslResolve(callPath TArtifact) int {
l := len(callPath.Path)
if l < 2 || l > 3 || callPath.Path[0] != "tnsl" || callPath.Path[1] != "io" {
return -1
}
if l > 2 && callPath.Path[2] != "File" {
return -1
}
if l > 2 {
if callPath.Name == "write" || callPath.Name == "read" || callPath.Name == "close" {
return 1;
}
} else {
if callPath.Name == "print" || callPath.Name == "println" || callPath.Name == "open_file" {
return 0;
}
}
return -1
}
// evaluate a function call.
// in is the variable in (if any)
// out is the variable out (if any)
// function is the name of the function
func tnslEval(in TVariable, function string) TVariable {
switch function {
case "print":
tprint(in)
case "println":
tprintln(in)
case "open_file":
return topen_file(in)
}
return TVariable{tNull, nil}
}
// evaluate a call on a file object
func tnslFileEval(file, in TVariable, function string) TVariable {
switch function {
case "close":
tfile_close(file)
case "read":
return tfile_read(file)
case "write":
tfile_write(file, in)
}
return TVariable{tNull, nil}
}
// Generic IO funcs
func tprint(in TVariable) {
fmt.Printf("%v", in.Data)
}
func tprintln(in TVariable) {
fmt.Printf("%v\n", in.Data)
}
func topen_file(in TVariable) TVariable {
if equateType(in.Type, tString) {
panic("Tried to open a file, but did not use a string type for the file name.")
}
fd, err := os.Create(in.Data.(string))
if err != nil {
panic(fmt.Sprintf("Failed to open file %v as requested by the program. Aborting.\n%v", in.Data, err))
}
return TVariable{tFile, fd}
}
// File API
// tnsl.io.File.close
func tfile_close(file TVariable) {
if equateType(file.Type, tFile) {
(file.Data).(*os.File).Close()
}
}
// tnsl.io.File.read
func tfile_read(file TVariable) TVariable {
b := []byte{1}
(file.Data).(*os.File).Read(b)
return TVariable{tCharp, b[0]}
}
// tnsl.io.File.write
func tfile_write(file, in TVariable) {
b := []byte{0}
if equateType(file.Type, tFile) && (equateType(in.Type, tCharp) || equateType(in.Type, tInt)) {
b[0] = (in.Data).(byte)
(file.Data).(*os.File).Write(b)
} else {
(file.Data).(*os.File).Close()
panic(fmt.Sprintf("Failed to write to file, attempted to use unsupported type (%v)\n", in.Type))
}
}
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