forked from Telodendria/Telodendria
Jordan Bancino
0b1b4a8b29
This workaround allows us to parse the Routes.h properly, although it notably lacks support for multi-word unknown expressions.
125 lines
3.5 KiB
C
125 lines
3.5 KiB
C
/*
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* Copyright (C) 2022-2023 Jordan Bancino <@jordan:bancino.net>
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef TELODENDRIA_HEADERPARSER_H
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#define TELODENDRIA_HEADERPARSER_H
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/***
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* @Nm HeaderParser
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* @Nd Parse simple C header files.
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* @Dd April 29 2023
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*
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* .Nm
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* is an extremely simple parser that lacks most of the functionality
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* one would expect from a C code parser. It simply maps a stream
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* of tokens into a few categories, parsing major ``milestones'' in
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* a header, without actually understanding any of the details.
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* .Pp
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* This exists because it is used to generate man pages from headers.
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* See
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* .Xr hdoc 1
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* for example usage of this parser.
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*/
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#include <Stream.h>
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#include <Array.h>
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#define HEADER_EXPR_MAX 4096
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/**
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* Headers are parsed as expressions. These are the expressions that
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* this parser recognizes.
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*/
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typedef enum HeaderExprType
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{
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HP_COMMENT,
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HP_PREPROCESSOR_DIRECTIVE,
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HP_TYPEDEF,
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HP_DECLARATION,
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HP_GLOBAL,
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HP_UNKNOWN,
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HP_SYNTAX_ERROR,
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HP_PARSE_ERROR,
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HP_EOF
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} HeaderExprType;
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/**
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* A representation of a function declaration.
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*/
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typedef struct HeaderDeclaration
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{
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char returnType[64];
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char name[32]; /* Enforced by ANSI C */
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Array *args;
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} HeaderDeclaration;
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/**
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* A global variable declaration. The type must be of the same size
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* as the function declaration's return type due to the way parsing
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* them is implemented.
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*/
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typedef struct HeaderGlobal
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{
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char type[64];
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char name[HEADER_EXPR_MAX - 64];
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} HeaderGlobal;
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/**
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* A representation of a single header expression. Note that that state
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* structure is entirely internally managed, so it should not be
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* accessed or manipulated by functions outside the functions defined
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* here.
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* .Pp
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* The type field should be used to determine which field in the data
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* union is valid.
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*/
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typedef struct HeaderExpr
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{
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HeaderExprType type;
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union
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{
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char text[HEADER_EXPR_MAX];
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HeaderDeclaration declaration;
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HeaderGlobal global;
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struct
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{
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int lineNo;
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char *msg;
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} error;
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} data;
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struct
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{
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Stream *stream;
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int lineNo;
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} state;
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} HeaderExpr;
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/**
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* Parse the next expression into the given header expression structure.
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* To parse an entire C header, this function should be called in a
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* loop until the type of the expression is HP_EOF.
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*/
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extern void HeaderParse(Stream *, HeaderExpr *);
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#endif /* TELODENDRIA_HEADERPARSER_H */
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