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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 "strings"
import "strconv"
import "unicode"
import "tparse"
import "fmt"
// Check if a block is the main function
func funcName(n tparse.Node) string {
if n.Data.Data == "block" {
if n.Sub[0].Data.Data == "bdef" {
for i := 0; i < len(n.Sub[0].Sub); i++ {
if n.Sub[0].Sub[i].Data.Type == tparse.DEFWORD {
return n.Sub[0].Sub[i].Data.Data
}
}
}
}
return ""
}
// Default values for variables
func defaultVaule(t string) interface{} {
switch t {
case "int", "uint", "int8", "uint8", "char", "charp":
return 0
case "string":
return ""
}
return nil
}
// Match specific type (t) with general type (g)
func typeMatches(t, g string) bool {
switch t {
case "int", "uint", "int8", "uint8":
return g == "integer"
case "float":
return g == "float"
case "char", "charp":
return g == "char"
case "string":
return g == "string"
}
return false
}
// Get the control flow's name
func cfType(n tparse.Node) string {
if n.Data.Data == "block" {
if n.Sub[0].Data.Data == "bdef" {
for i := 0; i < len(n.Sub[0].Sub); i++ {
if n.Sub[0].Sub[i].Data.Type == tparse.KEYWORD {
if n.Sub[0].Sub[i].Data.Data == "if" || n.Sub[0].Sub[i].Data.Data == "elif" || n.Sub[0].Sub[i].Data.Data == "else" || n.Sub[0].Sub[i].Data.Data == "match" || n.Sub[0].Sub[i].Data.Data == "case" || n.Sub[0].Sub[i].Data.Data == "loop" {
return n.Sub[0].Sub[i].Data.Data
}
}
}
}
}
return ""
}
// Get type as string from nodes
func evalType(n tparse.Node) string {
return ""
}
// Returns generated value and general "type" of value (string, number)
func evalPreLiteral(n tparse.Node) string {
r := tparse.StringAsRunes(n.Data.Data)
l := len(r)
if r[0] == '"' || r[0] == '\'' {
return tparse.RunesAsString(r[1:l - 1])
}
return ""
}
// Returns generated value and general "type" of value (string, number)
func evalLiteral(n tparse.Node) (interface{}, string) {
r := tparse.StringAsRunes(n.Data.Data)
l := len(r)
if r[0] == '"' {
return tparse.RunesAsString(r[1:l - 1]), "string"
} else if r[0] == '\'' {
return tparse.RunesAsString(r[1:l - 1]), "char"
} else if unicode.IsNumber(r[0]) {
if strings.Contains(n.Data.Data, ".") {
f, _ := strconv.ParseFloat(n.Data.Data, 64)
return f, "float"
} else {
i, _ := strconv.Atoi(n.Data.Data)
return i, "integer"
}
}
return nil, ""
}
// Evaluates a definition and sets up a TVariable in the context's var map
func evalDef(n tparse.Node, ctx *TContext) {
vars := len(ctx.VarMap) - 1
t := evalType(n.Sub[0])
for i := 0; i < len(n.Sub[1].Sub); i++ {
name := n.Sub[1].Sub[i].Data.Data
_, prs := ctx.VarMap[vars][name]
if prs {
panic(fmt.Sprintf("Attempted re-definition of a variable %v", name))
}
val := defaultVaule(t)
if n.Sub[1].Sub[i].Data.Data == "=" {
name = n.Sub[1].Sub[i].Sub[0].Data.Data
val = evalValue(n.Sub[1].Sub[i].Sub[1], ctx)
}
ctx.VarMap[vars][name] = TVariable{t, val}
}
}
func delScopeVars(sV []string, ctx *TContext) {
m := len(ctx.VarMap) - 1
for i := 0; i < len(sV); i++ {
delete(ctx.VarMap[m], sV[i])
}
}
// Evaluates a value statement
func evalValue(artifact tparse.Node, ctx *TContext) interface{} {
vars := len(ctx.VarMap) - 1
}
// Evaluates a loop
func evalLoop(artifact tparse.Node, ctx *TContext) {
}
func evalIf(artifact tparse.Node, ctx *TContext) bool {
var scopeVars []string
}
// Evaluate a block (Assume that all blocks have only one output for now)
func evalBlock(artifact tparse.Node, ctx *TContext) interface{} {
}
// EvalTNSL starts the evaluation on the root TModule's main function with the given flags passed to the program
func EvalTNSL(root *TModule, f string) {
flags := strings.Split(f, " ")
}
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