b19583e7d3
This is an initial implementation of the mgmt language. It is a declarative (immutable) functional, reactive, domain specific programming language. It is intended to be a language that is: * safe * powerful * easy to reason about With these properties, we hope this language, and the mgmt engine will allow you to model the real-time systems that you'd like to automate. This also includes a number of other associated changes. Sorry for the large size of this patch.
81 lines
2.7 KiB
Go
81 lines
2.7 KiB
Go
// Mgmt
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// Copyright (C) 2013-2018+ James Shubin and the project contributors
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// Written by James Shubin <james@shubin.ca> and the project contributors
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU 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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// This program 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 General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package lang // TODO: move this into a sub package of lang/$name?
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import (
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"fmt"
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"io"
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"github.com/purpleidea/mgmt/lang/interfaces"
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)
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// These constants represent the different possible lexer/parser errors.
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const (
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ErrLexerUnrecognized = interfaces.Error("unrecognized")
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ErrLexerStringBadEscaping = interfaces.Error("string: bad escaping")
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ErrLexerIntegerOverflow = interfaces.Error("integer: overflow")
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ErrLexerFloatOverflow = interfaces.Error("float: overflow")
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ErrParseError = interfaces.Error("parser")
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ErrParseAdditionalEquals = interfaces.Error(errstrParseAdditionalEquals)
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ErrParseExpectingComma = interfaces.Error(errstrParseExpectingComma)
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)
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// LexParseErr is a permanent failure error to notify about borkage.
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type LexParseErr struct {
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Err interfaces.Error
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Str string
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Row int // this is zero-indexed (the first line is 0)
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Col int // this is zero-indexed (the first char is 0)
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}
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// Error displays this error with all the relevant state information.
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func (e *LexParseErr) Error() string {
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return fmt.Sprintf("%s: `%s` @%d:%d", e.Err, e.Str, e.Row+1, e.Col+1)
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}
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// lexParseAST is a struct which we pass into the lexer/parser so that we have a
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// location to store the AST to avoid having to use a global variable.
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type lexParseAST struct {
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ast interfaces.Stmt
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row int
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col int
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lexerErr error // from lexer
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parseErr error // from Error(e string)
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}
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// LexParse runs the lexer/parser machinery and returns the AST.
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func LexParse(input io.Reader) (interfaces.Stmt, error) {
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lp := &lexParseAST{}
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// parseResult is a seemingly unused field in the Lexer struct for us...
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lexer := NewLexerWithInit(input, func(y *Lexer) { y.parseResult = lp })
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yyParse(lexer) // writes the result to lp.ast
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var err error
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if e := lp.parseErr; e != nil {
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err = e
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}
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if e := lp.lexerErr; e != nil {
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err = e
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}
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if err != nil {
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return nil, err
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}
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return lp.ast, nil
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}
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