101 lines
2.2 KiB
Go
101 lines
2.2 KiB
Go
/*
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* Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package pysig
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import (
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"strings"
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)
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type Arg struct {
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Name string
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Type string
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DefVal string
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}
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// Parse parses a Python function signature.
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func Parse(sig string) (args []*Arg) {
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sig = strings.TrimPrefix(sig, "(")
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for {
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pos := strings.IndexAny(sig, ",:=)")
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if pos <= 0 {
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return
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}
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arg := &Arg{Name: strings.TrimSpace(sig[:pos])}
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args = append(args, arg)
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c := sig[pos]
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sig = sig[pos+1:]
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switch c {
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case ',':
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continue
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case ':':
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arg.Type, sig = parseType(sig)
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if strings.HasPrefix(sig, "=") {
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arg.DefVal, sig = parseDefVal(sig[1:])
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}
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case '=':
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arg.DefVal, sig = parseDefVal(sig)
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case ')':
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return
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}
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sig = strings.TrimPrefix(sig, ",")
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}
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}
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const (
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allSpecials = "([<'\""
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)
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var pairStops = map[byte]string{
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'(': ")" + allSpecials,
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'[': "]" + allSpecials,
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'<': ">" + allSpecials,
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'\'': "'" + allSpecials,
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'"': "\"",
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}
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func parseText(sig string, stops string) (left string) {
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for {
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pos := strings.IndexAny(sig, stops)
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if pos < 0 {
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return sig
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}
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if c := sig[pos]; c != stops[0] {
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if pstop, ok := pairStops[c]; ok {
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sig = strings.TrimPrefix(parseText(sig[pos+1:], pstop), pstop[:1])
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continue
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}
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}
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return sig[pos:]
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}
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}
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// stops: "=,)"
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func parseType(sig string) (string, string) {
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left := parseText(sig, "=,)"+allSpecials)
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return resultOf(sig, left), left
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}
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// stops: ",)"
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func parseDefVal(sig string) (string, string) {
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left := parseText(sig, ",)"+allSpecials)
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return resultOf(sig, left), left
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}
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func resultOf(sig, left string) string {
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return strings.TrimSpace(sig[:len(sig)-len(left)])
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}
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