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2024-07-24 19:41:54 +03:00
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schemagen/ezxml.c Normal file
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/* ezxml.h
*
* Copyright 2004-2006 Aaron Voisine <aaron@voisine.org>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef _EZXML_H
#define _EZXML_H
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <fcntl.h>
#ifdef __cplusplus
extern "C" {
#endif
#define EZXML_BUFSIZE 1024 // size of internal memory buffers
#define EZXML_NAMEM 0x80 // name is malloced
#define EZXML_TXTM 0x40 // txt is malloced
#define EZXML_DUP 0x20 // attribute name and value are strduped
typedef struct ezxml *ezxml_t;
struct ezxml {
char *name; // tag name
char **attr; // tag attributes { name, value, name, value, ... NULL }
char *txt; // tag character content, empty string if none
size_t off; // tag offset from start of parent tag character content
ezxml_t next; // next tag with same name in this section at this depth
ezxml_t sibling; // next tag with different name in same section and depth
ezxml_t ordered; // next tag, same section and depth, in original order
ezxml_t child; // head of sub tag list, NULL if none
ezxml_t parent; // parent tag, NULL if current tag is root tag
short flags; // additional information
};
// Given a string of xml data and its length, parses it and creates an ezxml
// structure. For efficiency, modifies the data by adding null terminators
// and decoding ampersand sequences. If you don't want this, copy the data and
// pass in the copy. Returns NULL on failure.
ezxml_t ezxml_parse_str(char *s, size_t len);
// A wrapper for ezxml_parse_str() that accepts a file descriptor. First
// attempts to mem map the file. Failing that, reads the file into memory.
// Returns NULL on failure.
ezxml_t ezxml_parse_fd(int fd);
// a wrapper for ezxml_parse_fd() that accepts a file name
ezxml_t ezxml_parse_file(const char *file);
// Wrapper for ezxml_parse_str() that accepts a file stream. Reads the entire
// stream into memory and then parses it. For xml files, use ezxml_parse_file()
// or ezxml_parse_fd()
ezxml_t ezxml_parse_fp(FILE *fp);
// returns the first child tag (one level deeper) with the given name or NULL
// if not found
ezxml_t ezxml_child(ezxml_t xml, const char *name);
// returns the next tag of the same name in the same section and depth or NULL
// if not found
#define ezxml_next(xml) ((xml) ? xml->next : NULL)
// Returns the Nth tag with the same name in the same section at the same depth
// or NULL if not found. An index of 0 returns the tag given.
ezxml_t ezxml_idx(ezxml_t xml, int idx);
// returns the name of the given tag
#define ezxml_name(xml) ((xml) ? xml->name : NULL)
// returns the given tag's character content or empty string if none
#define ezxml_txt(xml) ((xml) ? xml->txt : "")
// returns the value of the requested tag attribute, or NULL if not found
const char *ezxml_attr(ezxml_t xml, const char *attr);
// Traverses the ezxml sturcture to retrieve a specific subtag. Takes a
// variable length list of tag names and indexes. The argument list must be
// terminated by either an index of -1 or an empty string tag name. Example:
// title = ezxml_get(library, "shelf", 0, "book", 2, "title", -1);
// This retrieves the title of the 3rd book on the 1st shelf of library.
// Returns NULL if not found.
ezxml_t ezxml_get(ezxml_t xml, ...);
// Converts an ezxml structure back to xml. Returns a string of xml data that
// must be freed.
char *ezxml_toxml(ezxml_t xml);
// returns a NULL terminated array of processing instructions for the given
// target
const char **ezxml_pi(ezxml_t xml, const char *target);
// frees the memory allocated for an ezxml structure
void ezxml_free(ezxml_t xml);
// returns parser error message or empty string if none
const char *ezxml_error(ezxml_t xml);
// returns a new empty ezxml structure with the given root tag name
ezxml_t ezxml_new(const char *name);
// wrapper for ezxml_new() that strdup()s name
#define ezxml_new_d(name) ezxml_set_flag(ezxml_new(strdup(name)), EZXML_NAMEM)
// Adds a child tag. off is the offset of the child tag relative to the start
// of the parent tag's character content. Returns the child tag.
ezxml_t ezxml_add_child(ezxml_t xml, const char *name, size_t off);
// wrapper for ezxml_add_child() that strdup()s name
#define ezxml_add_child_d(xml, name, off) \
ezxml_set_flag(ezxml_add_child(xml, strdup(name), off), EZXML_NAMEM)
// sets the character content for the given tag and returns the tag
ezxml_t ezxml_set_txt(ezxml_t xml, const char *txt);
// wrapper for ezxml_set_txt() that strdup()s txt
#define ezxml_set_txt_d(xml, txt) \
ezxml_set_flag(ezxml_set_txt(xml, strdup(txt)), EZXML_TXTM)
// Sets the given tag attribute or adds a new attribute if not found. A value
// of NULL will remove the specified attribute. Returns the tag given.
ezxml_t ezxml_set_attr(ezxml_t xml, const char *name, const char *value);
// Wrapper for ezxml_set_attr() that strdup()s name/value. Value cannot be NULL
#define ezxml_set_attr_d(xml, name, value) \
ezxml_set_attr(ezxml_set_flag(xml, EZXML_DUP), strdup(name), strdup(value))
// sets a flag for the given tag and returns the tag
ezxml_t ezxml_set_flag(ezxml_t xml, short flag);
// removes a tag along with its subtags without freeing its memory
ezxml_t ezxml_cut(ezxml_t xml);
// inserts an existing tag into an ezxml structure
ezxml_t ezxml_insert(ezxml_t xml, ezxml_t dest, size_t off);
// Moves an existing tag to become a subtag of dest at the given offset from
// the start of dest's character content. Returns the moved tag.
#define ezxml_move(xml, dest, off) ezxml_insert(ezxml_cut(xml), dest, off)
// removes a tag along with all its subtags
#define ezxml_remove(xml) ezxml_free(ezxml_cut(xml))
#ifdef __cplusplus
}
#endif
#endif // _EZXML_H

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#include<stdio.h>
#include"ezxml.h"
#include<ctype.h>
#include<stdlib.h>
#include<string.h>
int main(int argc, char **argv) {
ezxml_t schema = ezxml_parse_file(argv[1]);
char *Name = strdup(argv[2]);
char *NAME = strdup(Name);
for(char *c = NAME; *c; c++) {
*c = toupper(*c);
}
char *name = strdup(Name);
for(char *c = name; *c; c++) {
*c = tolower(*c);
}
printf("#ifndef %s_PARSER_H\n", NAME);
printf("#define %s_PARSER_H\n", NAME);
printf("#include<stdint.h>\n");
printf("#include<stddef.h>\n");
printf("#include<stdlib.h>\n");
printf("#include<string.h>\n");
printf("#include\"reader.h\"\n");
for(ezxml_t el = ezxml_child(schema, "element"); el; el = el->next) {
printf("#define %s_%s %sL\n", NAME, ezxml_attr(el, "name"), ezxml_attr(el, "id"));
}
printf("typedef struct %sParser {\n", Name);
printf("\tvoid *ud;\n");
printf("\tuint8_t *accum;\n");
printf("\tsize_t accumLen;\n");
printf("\tEBMLReader ebml;\n");
for(ezxml_t el = ezxml_child(schema, "element"); el; el = el->next) {
const char *type = ezxml_attr(el, "type");
if(!strcmp(type, "master")) {
printf("\tvoid(*On%s)(struct %sParser*);\n", ezxml_attr(el, "name"), Name);
} else if(!strcmp(type, "uinteger")) {
printf("\tvoid(*On%s)(struct %sParser*, uint64_t value);\n", ezxml_attr(el, "name"), Name);
} else if(!strcmp(type, "integer")) {
printf("\tvoid(*On%s)(struct %sParser*, int64_t value);\n", ezxml_attr(el, "name"), Name);
} else if(!strcmp(type, "date")) {
printf("\tvoid(*On%s)(struct %sParser*, int64_t value);\n", ezxml_attr(el, "name"), Name);
} else if(!strcmp(type, "float")) {
printf("\tvoid(*On%s)(struct %sParser*, double value);\n", ezxml_attr(el, "name"), Name);
} else {
if(strcmp(type, "binary") && strcmp(type, "utf-8") && strcmp(type, "string")) {
fprintf(stderr, "Interpreting unknown element type \"%s\" as binary\n", type);
}
printf("\tvoid(*On%s)(struct %sParser*, const uint8_t *data, size_t length);\n", ezxml_attr(el, "name"), Name);
}
}
printf("} %sParser;\n", Name);
printf("void %s_parser_init(%sParser*);\n", name, Name);
printf("size_t %s_parser_feed(%sParser*, const uint8_t *data, size_t length);\n", name, Name);
printf("#ifdef %s_PARSER_IMPLEMENTATION\n", NAME);
printf("EBMLElementType %s_event_enter_element(EBMLReader *rdr, uint64_t id, uint64_t length) {\n", name);
printf("\t%sParser *self = rdr->ud;\n", Name);
for(ezxml_t el = ezxml_child(schema, "element"); el; el = el->next) {
const char *type = ezxml_attr(el, "type");
if(!strcmp(type, "master")) {
printf("\tif(id == %s_%s) {\n", NAME, ezxml_attr(el, "name"));
printf("\t\tif(self->On%s) self->On%s(self);\n", ezxml_attr(el, "name"), ezxml_attr(el, "name"));
printf("\t\treturn EBML_TREE;\n");
printf("\t}\n");
}
}
printf("\treturn EBML_BINARY;\n");
printf("}\n");
printf("void %s_event_data_chunk(EBMLReader *rdr, const uint8_t *data, uint64_t length) {\n", name);
printf("\t%sParser *self = rdr->ud;\n", Name);
printf("\tself->accum = realloc(self->accum, self->accumLen + length);\n");
printf("\tmemcpy(self->accum + self->accumLen, data, length);\n");
printf("\tself->accumLen += length;\n");
printf("}\n");
printf("void %s_event_exit_element(EBMLReader *rdr) {\n", name);
printf("\t%sParser *self = rdr->ud;\n", Name);
printf("\tuint64_t id = rdr->idStack[rdr->currentDepth - 1];\n");
for(ezxml_t el = ezxml_child(schema, "element"); el; el = el->next) {
const char *type = ezxml_attr(el, "type");
printf("\tif(id == %s_%s) {\n", NAME, ezxml_attr(el, "name"));
if(!strcmp(type, "uinteger") || !strcmp(type, "integer") || !strcmp(type, "date")) {
printf("\t\t%s val = 0;\n", !strcmp(type, "uinteger") ? "uint64_t" : "int64_t");
printf("\t\tmemcpy((uint8_t*) &val + 8 - self->accumLen, self->accum, self->accumLen);\n");
printf("\t\tval = be64toh(val);\n");
printf("\t\tif(self->On%s) self->On%s(self, val);\n", ezxml_attr(el, "name"), ezxml_attr(el, "name"));
} else if(!strcmp(type, "string") || !strcmp(type, "utf-8") || !strcmp(type, "binary")) {
if(strcmp(type, "binary") != 0) {
printf("\t\tself->accum = realloc(self->accum, self->accumLen + 1);\n");
printf("\t\tself->accum[self->accumLen] = 0;\n");
}
printf("\t\tif(self->On%s) self->On%s(self, self->accum, self->accumLen);\n", ezxml_attr(el, "name"), ezxml_attr(el, "name"));
} else if(!strcmp(type, "float")) {
printf("\t\tdouble val;\n");
printf("\t\tif(self->accumLen == 4) {\n");
printf("\t\t\tfloat fval;\n");
printf("\t\t\tmemcpy(&fval, self->accum, 4);\n");
printf("\t\t\t*(uint32_t*) &fval = be32toh(*(uint32_t*) &fval);\n");
printf("\t\t\tval = fval;\n");
printf("\t\t} else {\n");
printf("\t\t\tmemcpy(&val, self->accum, 8);\n");
printf("\t\t\t*(uint64_t*) &val = be64toh(*(uint64_t*) &val);\n");
printf("\t\t}\n");
printf("\t\tif(self->On%s) self->On%s(self, val);\n", ezxml_attr(el, "name"), ezxml_attr(el, "name"));
} else if(!strcmp(type, "master")) {
// Do nothing.
} else {
fprintf(stderr, "Ignoring unknown type \"%s\"\n", type);
}
printf("\t}\n");
}
printf("\tfree(self->accum); self->accum = NULL; self->accumLen = 0;\n");
printf("}\n");
printf("void %s_parser_init(%sParser *self) {\n", name, Name);
printf("\tmemset(self, 0, sizeof(*self));\n");
printf("\tebml_reader_init(&self->ebml);\n");
printf("\tself->ebml.eventEnterElement = %s_event_enter_element;\n", name);
printf("\tself->ebml.eventDataChunk = %s_event_data_chunk;\n", name);
printf("\tself->ebml.eventExitElement = %s_event_exit_element;\n", name);
printf("\tself->ebml.ud = self;\n");
printf("}\n");
printf("size_t %s_parser_feed(%sParser *self, const uint8_t *data, size_t length) {\n", name, Name);
printf("\treturn ebml_reader_feed(&self->ebml, data, length);\n");
printf("}\n");
printf("#endif\n");
printf("#endif\n");
}