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+// Copyright 2019 The go-ethereum Authors
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+// This file is part of the go-ethereum library.
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+//
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+// The go-ethereum library is free software: you can redistribute it and/or modify
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+// it under the terms of the GNU Lesser General Public License as published by
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+// the Free Software Foundation, either version 3 of the License, or
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+// (at your option) any later version.
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+//
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+// The go-ethereum library is distributed in the hope that it will be useful,
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+// but WITHOUT ANY WARRANTY; without even the implied warranty of
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+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+// GNU Lesser General Public License for more details.
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+//
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+// You should have received a copy of the GNU Lesser General Public License
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+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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+
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+// Package compiler wraps the Solidity and Vyper compiler executables (solc; vyper).
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+package compiler
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+
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+import (
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+ "bytes"
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+ "encoding/json"
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+ "errors"
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+ "fmt"
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+ "os/exec"
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+ "strconv"
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+ "strings"
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+)
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+
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+// Vyper contains information about the vyper compiler.
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+type Vyper struct {
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+ Path, Version, FullVersion string
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+ Major, Minor, Patch int
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+}
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+
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+func (s *Vyper) makeArgs() []string {
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+ p := []string{
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+ "-f", "combined_json",
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+ }
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+ return p
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+}
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+
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+// VyperVersion runs vyper and parses its version output.
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+func VyperVersion(vyper string) (*Vyper, error) {
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+ if vyper == "" {
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+ vyper = "vyper"
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+ }
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+ var out bytes.Buffer
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+ cmd := exec.Command(vyper, "--version")
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+ cmd.Stdout = &out
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+ err := cmd.Run()
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+ if err != nil {
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+ return nil, err
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+ }
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+ matches := versionRegexp.FindStringSubmatch(out.String())
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+ if len(matches) != 4 {
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+ return nil, fmt.Errorf("can't parse vyper version %q", out.String())
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+ }
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+ s := &Vyper{Path: cmd.Path, FullVersion: out.String(), Version: matches[0]}
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+ if s.Major, err = strconv.Atoi(matches[1]); err != nil {
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+ return nil, err
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+ }
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+ if s.Minor, err = strconv.Atoi(matches[2]); err != nil {
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+ return nil, err
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+ }
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+ if s.Patch, err = strconv.Atoi(matches[3]); err != nil {
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+ return nil, err
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+ }
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+ return s, nil
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+}
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+
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+// CompileVyper compiles all given Vyper source files.
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+func CompileVyper(vyper string, sourcefiles ...string) (map[string]*Contract, error) {
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+ if len(sourcefiles) == 0 {
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+ return nil, errors.New("vyper: no source files")
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+ }
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+ source, err := slurpFiles(sourcefiles)
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+ if err != nil {
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+ return nil, err
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+ }
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+ s, err := VyperVersion(vyper)
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+ if err != nil {
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+ return nil, err
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+ }
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+ args := s.makeArgs()
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+ cmd := exec.Command(s.Path, append(args, sourcefiles...)...)
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+ return s.run(cmd, source)
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+}
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+
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+func (s *Vyper) run(cmd *exec.Cmd, source string) (map[string]*Contract, error) {
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+ var stderr, stdout bytes.Buffer
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+ cmd.Stderr = &stderr
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+ cmd.Stdout = &stdout
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+ if err := cmd.Run(); err != nil {
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+ return nil, fmt.Errorf("vyper: %v\n%s", err, stderr.Bytes())
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+ }
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+
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+ return ParseVyperJSON(stdout.Bytes(), source, s.Version, s.Version, strings.Join(s.makeArgs(), " "))
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+}
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+
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+// ParseVyperJSON takes the direct output of a vyper --f combined_json run and
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+// parses it into a map of string contract name to Contract structs. The
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+// provided source, language and compiler version, and compiler options are all
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+// passed through into the Contract structs.
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+//
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+// The vyper output is expected to contain ABI and source mapping.
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+//
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+// Returns an error if the JSON is malformed or missing data, or if the JSON
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+// embedded within the JSON is malformed.
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+func ParseVyperJSON(combinedJSON []byte, source string, languageVersion string, compilerVersion string, compilerOptions string) (map[string]*Contract, error) {
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+ var output map[string]interface{}
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+ if err := json.Unmarshal(combinedJSON, &output); err != nil {
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+ return nil, err
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+ }
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+
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+ // Compilation succeeded, assemble and return the contracts.
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+ contracts := make(map[string]*Contract)
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+ for name, info := range output {
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+ // Parse the individual compilation results.
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+ if name == "version" {
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+ continue
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+ }
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+ c := info.(map[string]interface{})
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+
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+ contracts[name] = &Contract{
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+ Code: c["bytecode"].(string),
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+ RuntimeCode: c["bytecode_runtime"].(string),
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+ Info: ContractInfo{
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+ Source: source,
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+ Language: "Vyper",
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+ LanguageVersion: languageVersion,
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+ CompilerVersion: compilerVersion,
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+ CompilerOptions: compilerOptions,
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+ SrcMap: c["source_map"],
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+ SrcMapRuntime: "",
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+ AbiDefinition: c["abi"],
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+ UserDoc: "",
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+ DeveloperDoc: "",
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+ Metadata: "",
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+ },
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+ }
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+ }
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+ return contracts, nil
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+}
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Kushagra Sharma