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package main
import (
"encoding/json"
"fmt"
"io"
"os"
"driver/lexer"
"driver/parser"
spec "spec/grammar"
)
func runGenerate(args []string) error {
cgram, err := readCompiledGrammar(args[0])
if err != nil {
return fmt.Errorf("Cannot read a compiled grammar: %w", err)
}
{
b, err := lexer.GenLexer(cgram.Lexical, "main")
if err != nil {
return fmt.Errorf("Failed to generate a lexer: %w", err)
}
filePath := fmt.Sprintf("%v_lexer.go", cgram.Name)
f, err := os.OpenFile(filePath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return fmt.Errorf("Failed to create an output file: %v", err)
}
defer f.Close()
_, err = f.Write(b)
if err != nil {
return fmt.Errorf("Failed to write lexer source code: %v", err)
}
}
{
b, err := parser.GenParser(cgram, "main")
if err != nil {
return fmt.Errorf("Failed to generate a parser: %w", err)
}
filePath := fmt.Sprintf("%v_parser.go", cgram.Name)
f, err := os.OpenFile(filePath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return fmt.Errorf("Failed to create an output file: %v", err)
}
defer f.Close()
_, err = f.Write(b)
if err != nil {
return fmt.Errorf("Failed to write parser source code: %v", err)
}
}
{
b, err := parser.GenSemanticAction("main")
if err != nil {
return fmt.Errorf("Failed to generate a semantic action set: %w", err)
}
filePath := fmt.Sprintf("%v_semantic_action.go", cgram.Name)
f, err := os.OpenFile(filePath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return fmt.Errorf("Failed to create an output file: %v", err)
}
defer f.Close()
_, err = f.Write(b)
if err != nil {
return fmt.Errorf("Failed to write semantic action source code: %v", err)
}
}
return nil
}
func readCompiledGrammar(path string) (*spec.CompiledGrammar, error) {
f, err := os.Open(path)
if err != nil {
return nil, err
}
data, err := io.ReadAll(f)
if err != nil {
return nil, err
}
cgram := &spec.CompiledGrammar{}
err = json.Unmarshal(data, cgram)
if err != nil {
return nil, err
}
return cgram, nil
}
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