bootstrap

package

v0.0.0-...-6735110 Latest Latest Go to latest Published: Apr 9, 2015 License: BSD-3-Clause Imports: 10 Imported by: 0

Details

Valid go.mod file
Redistributable license
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Repository

github.com/alecthomas/pigeon

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Documentation ¶

Overview ¶

Package bootstrap implements the scanner and parser to bootstrap the PEG parser generator.

It parses the PEG grammar into an ast that is then used to generate a parser generator based on this PEG grammar. The generated parser can then parse the grammar again, without the bootstrap package.

Index ¶

type Parser
- func NewParser() *Parser
- func (p *Parser) Parse(filename string, r io.Reader) (*ast.Grammar, error)
type Scanner
- func (s *Scanner) Init(filename string, r io.Reader, errh func(ast.Pos, error))
- func (s *Scanner) Scan() (Token, bool)
type Token
- func (t Token) String() string

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

This section is empty.

Types ¶

type Parser ¶

type Parser struct {
	// contains filtered or unexported fields
}

Parser holds the state to parse the PEG grammar into an abstract syntax tree (AST).

func NewParser ¶

func NewParser() *Parser

NewParser creates a new Parser.

func (*Parser) Parse ¶

func (p *Parser) Parse(filename string, r io.Reader) (*ast.Grammar, error)

Parse parses the data from the reader r and generates the AST or returns an error if it fails. The filename is used as information in the error messages.

type Scanner ¶

type Scanner struct {
	// contains filtered or unexported fields
}

Scanner tokenizes an input source for the PEG grammar.

func (*Scanner) Init ¶

func (s *Scanner) Init(filename string, r io.Reader, errh func(ast.Pos, error))

Init initializes the scanner to read and tokenize text from r.

func (*Scanner) Scan ¶

func (s *Scanner) Scan() (Token, bool)

Scan returns the next token, along with a boolean indicating if EOF was reached (false means no more tokens).

type Token ¶

type Token struct {
	// contains filtered or unexported fields
}

Token is a syntactic token generated by the scanner.

func (Token) String ¶

func (t Token) String() string

Source Files ¶

View all Source files

Directories ¶

Path	Synopsis
cmd
bootstrap-build Command bootstrap-build bootstraps the PEG parser generator by parsing the bootstrap grammar and creating a basic parser generator sufficiently complete to parse the pigeon PEG grammar.	Command bootstrap-build bootstraps the PEG parser generator by parsing the bootstrap grammar and creating a basic parser generator sufficiently complete to parse the pigeon PEG grammar.
bootstrap-pigeon Command bootstrap-pigeon generates a PEG parser from a PEG grammar to bootstrap the pigeon command-line tool, as it is built using a simplified bootstrapping grammar that understands just enough of the pigeon grammar to parse it and build the tool.	Command bootstrap-pigeon generates a PEG parser from a PEG grammar to bootstrap the pigeon command-line tool, as it is built using a simplified bootstrapping grammar that understands just enough of the pigeon grammar to parse it and build the tool.
pegparse Command pegparse is a helper command-line tool to test the bootstrap parser.	Command pegparse is a helper command-line tool to test the bootstrap parser.
pegscan Command pegscan is a helper command-line tool to test the bootstrap scanner.	Command pegscan is a helper command-line tool to test the bootstrap scanner.

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