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interface.go
132 lines (108 loc) · 3.03 KB
/
interface.go
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// Copyright 2018 The CUE Authors
//
// 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.
// This file contains the exported entry points for invoking the
package parser
import (
"io"
"github.com/acorn-io/aml/pkg/ast"
"github.com/acorn-io/aml/pkg/errors"
"github.com/acorn-io/aml/pkg/parser/filemap"
"github.com/acorn-io/aml/pkg/token"
)
// Option specifies a parse option.
type Option func(p *parser)
var (
// Trace causes parsing to print a trace of parsed productions.
Trace Option = traceOpt
traceOpt = func(p *parser) {
p.mode |= traceMode
}
)
// A mode value is a set of flags (or 0).
// They control the amount of source code parsed and other optional
// parser functionality.
type mode uint
const (
parseCommentsMode mode = 1 << iota // parse comments and add them to AST
traceMode // print a trace of parsed productions
)
func ParseFile(filename string, src io.Reader, mode ...Option) (retFile *ast.File, retErr error) {
text, err := io.ReadAll(src)
if err != nil {
return nil, err
}
var (
pp parser
result = ast.File{
Filename: filename,
}
)
defer func() {
if pp.panicking {
_ = recover()
}
// set result values
if retFile == nil {
retFile = &ast.File{}
}
retErr = errors.SanitizeParserErrors(retErr)
}()
fileMap, err := filemap.FromBytes(filename, text)
if err != nil {
return nil, err
}
for _, entry := range fileMap.Files() {
// reset parser
pp = parser{}
// parse source
pp.init(entry.Filename, entry.Data, mode)
f := pp.parseFile()
if f == nil {
return nil, errors.Join(pp.errors...)
}
if len(pp.errors) > 0 {
return nil, errors.Join(pp.errors...)
}
result.Decls = append(result.Decls, f.Decls...)
result.SetComments(append(result.Comments(), f.Comments()...))
}
return &result, nil
}
func ParseExpr(filename string, src io.Reader, mode ...Option) (_ ast.Expr, retErr error) {
text, err := io.ReadAll(src)
if err != nil {
return nil, err
}
var p parser
defer func() {
if p.panicking {
_ = recover()
}
retErr = errors.SanitizeParserErrors(retErr)
}()
// parse expr
p.init(filename, text, mode)
// Set up pkg-level scopes to avoid nil-pointer errors.
// This is not needed for a correct expression x as the
// parser will be ok with a nil topScope, but be cautious
// in case of an erroneous x.
e := p.parseRHS()
// If a comma was inserted, consume it;
// report an error if there's more tokens.
if p.tok == token.COMMA && p.lit == "\n" {
p.next()
}
p.expect(token.EOF)
return e, errors.Join(p.errors...)
}