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[dotfiles/.git] / .config / coc / extensions / coc-go-data / tools / pkg / mod / golang.org / x / tools@v0.0.0-20201105173854-bc9fc8d8c4bc / cmd / goyacc / doc.go

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-// Copyright 2009 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-/*
-
-Goyacc is a version of yacc for Go.
-It is written in Go and generates parsers written in Go.
-
-Usage:
-
-       goyacc args...
-
-It is largely transliterated from the Inferno version written in Limbo
-which in turn was largely transliterated from the Plan 9 version
-written in C and documented at
-
-       https://9p.io/magic/man2html/1/yacc
-
-Adepts of the original yacc will have no trouble adapting to this
-form of the tool.
-
-The directory $GOPATH/src/golang.org/x/tools/cmd/goyacc/testdata/expr
-is a yacc program for a very simple expression parser. See expr.y and
-main.go in that directory for examples of how to write and build
-goyacc programs.
-
-The generated parser is reentrant. The parsing function yyParse expects
-to be given an argument that conforms to the following interface:
-
-       type yyLexer interface {
-               Lex(lval *yySymType) int
-               Error(e string)
-       }
-
-Lex should return the token identifier, and place other token
-information in lval (which replaces the usual yylval).
-Error is equivalent to yyerror in the original yacc.
-
-Code inside the grammar actions may refer to the variable yylex,
-which holds the yyLexer passed to yyParse.
-
-Clients that need to understand more about the parser state can
-create the parser separately from invoking it. The function yyNewParser
-returns a yyParser conforming to the following interface:
-
-       type yyParser interface {
-               Parse(yyLex) int
-               Lookahead() int
-       }
-
-Parse runs the parser; the top-level call yyParse(yylex) is equivalent
-to yyNewParser().Parse(yylex).
-
-Lookahead can be called during grammar actions to read (but not consume)
-the value of the current lookahead token, as returned by yylex.Lex.
-If there is no current lookahead token (because the parser has not called Lex
-or has consumed the token returned by the most recent call to Lex),
-Lookahead returns -1. Calling Lookahead is equivalent to reading
-yychar from within in a grammar action.
-
-Multiple grammars compiled into a single program should be placed in
-distinct packages.  If that is impossible, the "-p prefix" flag to
-goyacc sets the prefix, by default yy, that begins the names of
-symbols, including types, the parser, and the lexer, generated and
-referenced by yacc's generated code.  Setting it to distinct values
-allows multiple grammars to be placed in a single package.
-
-*/
-package main