umx_compiler

commit 4dea3b2e446b0a0628a452a4a69552cb28c841b3
parent 620e9910e6807c8bf8ab9fcf0a9a982f7cf491c9
Author: bsandro <email@bsandro.tech>
Date:   Fri,  1 Jul 2022 01:05:57 +0300

support for running script files from command line

Diffstat:
M
main.go
 | 
15
+++++++++++++--
M
repl/repl.go
 | 
14
+++++++++++++-
M
test.in
 | 
12
++++++++++--

3 files changed, 36 insertions(+), 5 deletions(-)
diff --git a/main.go b/main.go
@@ -12,6 +12,17 @@ func main() {
 	if err != nil {
 		panic(err)
 	}
-	fmt.Printf("ehlo %s, this is a potato interpretator cleverly named 'interp'\n", user.Username)
-	repl.Start(os.Stdin, os.Stdout)
+
+	if len(os.Args) > 1 {
+		fname := os.Args[1]
+		script, err := os.ReadFile(fname)
+		if err != nil {
+			fmt.Printf("error opening file %s: %s\n", fname, err.Error())
+			return
+		}
+		repl.Run(string(script), os.Stdout)
+	} else {
+		fmt.Printf("ehlo %s, this is a potato interpretator cleverly named 'interp'\n", user.Username)
+		repl.Start(os.Stdin, os.Stdout)
+	}
 }
diff --git a/repl/repl.go b/repl/repl.go
@@ -5,8 +5,8 @@ import (
 	"fmt"
 	"interp/eval"
 	"interp/lexer"
-	"interp/parser"
 	"interp/object"
+	"interp/parser"
 	"io"
 )
 
@@ -42,3 +42,15 @@ func printParserErrors(out io.Writer, errors []string) {
 		io.WriteString(out, "\t"+msg+"\n")
 	}
 }
+
+func Run(script string, out io.Writer) {
+	ctx := object.NewContext()
+	l := lexer.New(script)
+	p := parser.New(l)
+	prg := p.ParseProgram()
+	if len(p.Errors()) == 0 {
+		eval.Eval(prg, ctx)
+	} else {
+		printParserErrors(out, p.Errors())
+	}
+}
diff --git a/test.in b/test.in
@@ -1,6 +1,14 @@
-let myhash = {"value1": 1,"value2": "two"};
+let myhash = {
+  "value1": 1,
+  "value2": "two",
+  "value3": "three"
+};
 
 let one = "value";
 let two = "2";
 
-puts(one, two, myhash[one+two]);
+let myfunc = fn(h) {
+  puts(h[one+two]);
+};
+
+myfunc(myhash);