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foxbox/lib/skin_parser/skin_parser.c
Thomas Jarosch fdd4aef340 Make thirty functions static to reduce binary size 
If any of those functions should be (unused) API functions,
they can easily be turned back once really needed.

Detected using a new cppcheck check that
uses the internal symbol database to catch
functions that are only used in the current file.

Change-Id: Ic2b1e5b8020b76397f11cefc4e205f3b7ac1f184
2015-01-05 18:44:36 +01:00

1217 lines
33 KiB
C
Raw Blame History

/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2010 Robert Bieber
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <ctype.h>
#include "skin_buffer.h"
#include "skin_parser.h"
#include "skin_debug.h"
#include "tag_table.h"
#include "symbols.h"
#include "skin_scan.h"
/* Global variables for the parser */
int skin_line = 0;
char* skin_start = 0;
int viewport_line = 0;
#ifdef ROCKBOX
static skin_callback callback = NULL;
static void* callback_data;
#endif
/* Auxiliary parsing functions (not visible at global scope) */
static struct skin_element* skin_parse_viewport(const char** document);
static struct skin_element* skin_parse_line(const char** document);
static struct skin_element* skin_parse_line_optional(const char** document,
int conditional);
static struct skin_element* skin_parse_sublines(const char** document);
static struct skin_element* skin_parse_sublines_optional(const char** document,
int conditional);
static int skin_parse_tag(struct skin_element* element, const char** document);
static int skin_parse_text(struct skin_element* element, const char** document,
int conditional);
static int skin_parse_conditional(struct skin_element* element,
const char** document);
static int skin_parse_comment(struct skin_element* element, const char** document);
static struct skin_element* skin_parse_code_as_arg(const char** document);
static void skip_whitespace(const char** document)
{
while(**document == ' ' || **document == '\t')
(*document)++;
}
#ifdef ROCKBOX
struct skin_element* skin_parse(const char* document,
skin_callback cb, void* cb_data)
{
callback = cb;
callback_data = cb_data;
#else
struct skin_element* skin_parse(const char* document)
{
#endif
struct skin_element* root = NULL;
struct skin_element* last = NULL;
const char* cursor = document; /*Keeps track of location in the document*/
skin_line = 1;
skin_start = (char*)document;
viewport_line = 0;
skin_clear_errors();
while(*cursor != '\0')
{
struct skin_element* tree = skin_parse_viewport(&cursor);
if(!root)
{
root = tree;
last = root;
}
else
{
last->next = skin_buffer_to_offset(tree);
last = tree;
}
if(!last)
{
skin_free_tree(root); /* Clearing any memory already used */
return NULL;
}
/* Making sure last is at the end */
while(IS_VALID_OFFSET(last->next))
last = skin_buffer_from_offset(last->next);
}
return root;
}
static struct skin_element* skin_parse_viewport(const char** document)
{
struct skin_element* root = NULL;
struct skin_element* last = NULL;
struct skin_element* retval = NULL;
retval = skin_alloc_element();
if (!retval)
return NULL;
retval->type = VIEWPORT;
retval->children_count = 1;
retval->line = skin_line;
viewport_line = skin_line;
OFFSETTYPE(struct skin_element*)* children;
const char* cursor = *document; /* Keeps track of location in the document */
const char* bookmark; /* Used when we need to look ahead */
int sublines = 0; /* Flag for parsing sublines */
/* Parsing out the viewport tag if there is one */
if(check_viewport(cursor))
{
if (!skin_parse_tag(retval, &cursor))
return NULL;
if(*cursor == '\n')
{
cursor++;
skin_line++;
}
}
#ifdef ROCKBOX
else if (callback)
{
if (callback(retval, callback_data) == CALLBACK_ERROR)
{
skin_error(GOT_CALLBACK_ERROR, cursor);
return NULL;
}
}
#endif
if (check_viewport(cursor))
{
retval->children_count = 0;
*document = cursor;
return retval;
}
retval->children_count = 1;
children = skin_alloc_children(1);
if (!children)
return NULL;
do
{
/* First, we check to see if this line will contain sublines */
bookmark = cursor;
sublines = 0;
while(*cursor != '\n' && *cursor != '\0'
&& !(check_viewport(cursor) && cursor != *document))
{
if(*cursor == MULTILINESYM)
{
sublines = 1;
break;
}
else if(*cursor == TAGSYM)
{
skip_tag(&cursor);
}
else if(*cursor == COMMENTSYM)
{
skip_comment(&cursor);
}
else
{
/* Advancing the cursor as normal */
cursor++;
}
}
cursor = bookmark;
if(sublines)
{
struct skin_element* out = skin_parse_sublines(&cursor);
if (!root)
{
root = out;
last = root;
}
else
{
last->next = skin_buffer_to_offset(out);
last = out;
}
if(!last)
return NULL;
}
else
{
#ifdef ROCKBOX
/* strip all leading comments */
while(*cursor == '#')
{
skip_comment(&cursor);
skin_line++;
}
if (check_viewport(cursor))
break;
#endif
struct skin_element* out = skin_parse_line(&cursor);
if (!root)
{
root = out;
last = root;
}
else
{
last->next = skin_buffer_to_offset(out);
last = out;
}
if(!last)
return NULL;
}
/* Making sure last is at the end */
while(IS_VALID_OFFSET(last->next))
last = skin_buffer_from_offset(last->next);
if(*cursor == '\n')
{
cursor++;
skin_line++;
}
#ifdef ROCKBOX
/* strip all comments */
while(*cursor == '#')
{
skip_comment(&cursor);
skin_line++;
}
if (check_viewport(cursor))
break;
#endif
}
while(*cursor != '\0' && !(check_viewport(cursor) && cursor != *document));
*document = cursor;
children[0] = skin_buffer_to_offset(root);
retval->children = skin_buffer_to_offset(children);
return retval;
}
/* Auxiliary Parsing Functions */
static struct skin_element* skin_parse_line(const char**document)
{
return skin_parse_line_optional(document, 0);
}
/*
* If conditional is set to true, then this will break upon encountering
* SEPARATESYM. This should only be used when parsing a line inside a
* conditional, otherwise just use the wrapper function skin_parse_line()
*/
static struct skin_element* skin_parse_line_optional(const char** document,
int conditional)
{
const char* cursor = *document;
struct skin_element* root = NULL;
struct skin_element* current = NULL;
struct skin_element* retval = NULL;
OFFSETTYPE(struct skin_element*)* children = NULL;
/* A wrapper for the line */
retval = skin_alloc_element();
if (!retval)
return NULL;
retval->type = LINE;
retval->line = skin_line;
while (*cursor == '\t')
cursor++;
if(*cursor != '\0' && *cursor != '\n' && *cursor != MULTILINESYM
&& !(conditional && (*cursor == ARGLISTSEPARATESYM
|| *cursor == ARGLISTCLOSESYM
|| *cursor == ENUMLISTSEPARATESYM
|| *cursor == ENUMLISTCLOSESYM)))
{
retval->children_count = 1;
}
else
{
retval->children_count = 0;
}
if(retval->children_count > 0)
{
children = skin_alloc_children(1);
if (!children)
return NULL;
}
#ifdef ROCKBOX
if (callback)
{
switch (callback(retval, callback_data))
{
case CALLBACK_ERROR:
skin_error(GOT_CALLBACK_ERROR, cursor);
return NULL;
default:
break;
}
}
#endif
while(*cursor != '\n' && *cursor != '\0' && *cursor != MULTILINESYM
&& !((*cursor == ARGLISTSEPARATESYM
|| *cursor == ARGLISTCLOSESYM
|| *cursor == ENUMLISTSEPARATESYM
|| *cursor == ENUMLISTCLOSESYM)
&& conditional)
&& !(check_viewport(cursor) && cursor != *document))
{
/* Allocating memory if necessary */
if(root)
{
struct skin_element *next = skin_alloc_element();
if (!next)
return NULL;
current->next = skin_buffer_to_offset(next);
current = next;
}
else
{
current = skin_alloc_element();
if (!current)
return NULL;
root = current;
}
/* Parsing the current element */
if(*cursor == TAGSYM && cursor[1] == CONDITIONSYM)
{
if(!skin_parse_conditional(current, &cursor))
return NULL;
}
else if(*cursor == TAGSYM && !find_escape_character(cursor[1]))
{
if(!skin_parse_tag(current, &cursor))
return NULL;
}
else if(*cursor == COMMENTSYM)
{
if(!skin_parse_comment(current, &cursor))
return NULL;
}
else
{
if(!skin_parse_text(current, &cursor, conditional))
return NULL;
}
}
/* Moving up the calling function's pointer */
*document = cursor;
if(root)
{
children[0] = skin_buffer_to_offset(root);
retval->children = skin_buffer_to_offset(children);
}
return retval;
}
static struct skin_element* skin_parse_sublines(const char** document)
{
return skin_parse_sublines_optional(document, 0);
}
static struct skin_element* skin_parse_sublines_optional(const char** document,
int conditional)
{
struct skin_element* retval;
OFFSETTYPE(struct skin_element*)* children;
const char* cursor = *document;
int sublines = 1;
int i;
retval = skin_alloc_element();
if (!retval)
return NULL;
retval->type = LINE_ALTERNATOR;
retval->next = skin_buffer_to_offset(NULL);
retval->line = skin_line;
while (*cursor == '\t')
cursor++;
/* First we count the sublines */
while(*cursor != '\0' && *cursor != '\n'
&& !((*cursor == ARGLISTSEPARATESYM
|| *cursor == ARGLISTCLOSESYM
|| *cursor == ENUMLISTSEPARATESYM
|| *cursor == ENUMLISTCLOSESYM)
&& conditional)
&& !(check_viewport(cursor) && cursor != *document))
{
if(*cursor == COMMENTSYM)
{
skip_comment(&cursor);
}
else if(*cursor == TAGSYM)
{
skip_tag(&cursor);
}
else if(*cursor == MULTILINESYM)
{
sublines++;
cursor++;
}
else
{
cursor++;
}
}
/* ...and then we parse them */
retval->children_count = sublines;
children = skin_alloc_children(sublines);
if (!children)
return NULL;
cursor = *document;
for(i = 0; i < sublines; i++)
{
children[i] = skin_buffer_to_offset(skin_parse_line_optional(&cursor, conditional));
if (children[i] < 0)
return NULL;
skip_whitespace(&cursor);
if(*cursor != MULTILINESYM && i != sublines - 1)
{
skin_error(MULTILINE_EXPECTED, cursor);
return NULL;
}
else if(i != sublines - 1)
{
cursor++;
}
}
#ifdef ROCKBOX
if (callback)
{
if (callback(retval, callback_data) == CALLBACK_ERROR)
{
skin_error(GOT_CALLBACK_ERROR, *document);
return NULL;
}
}
#endif
*document = cursor;
retval->children = skin_buffer_to_offset(children);
return retval;
}
static int skin_parse_tag(struct skin_element* element, const char** document)
{
const char* cursor = *document + 1;
const char* bookmark;
char *open_square_bracket = NULL;
char tag_name[MAX_TAG_LENGTH];
char* tag_args;
const struct tag_info *tag;
struct skin_tag_parameter* params = NULL;
int num_args = 1;
int i;
int qmark = 0; /* Flag for the all-or-none option */
int optional = 0;
/* Checking the tag name */
for (i=0; cursor[i] && i<MAX_TAG_LENGTH; i++)
tag_name[i] = cursor[i];
/* First we check the two characters after the '%', then a single char */
tag = NULL;
i = MAX_TAG_LENGTH;
while (!tag && i > 1)
{
tag_name[i-1] = '\0';
tag = find_tag(tag_name);
i--;
}
if(!tag)
{
skin_error(ILLEGAL_TAG, cursor);
return 0;
}
cursor += i;
/* Copying basic tag info */
if(element->type != CONDITIONAL && element->type != VIEWPORT)
element->type = TAG;
element->tag = tag;
tag_args = tag->params;
element->line = skin_line;
/* Checking for the * flag */
if(tag_args[0] == '?')
{
qmark = 1;
tag_args++;
}
/* If this tag has no arguments, we can bail out now */
if(strlen(tag_args) == 0
|| (tag_args[0] == '|' && *cursor != ARGLISTOPENSYM)
|| (qmark && *cursor != ARGLISTOPENSYM))
{
#ifdef ROCKBOX
if (callback)
{
if (callback(element, callback_data) == CALLBACK_ERROR)
{
skin_error(GOT_CALLBACK_ERROR, cursor);
return 0;
}
}
#endif
*document = cursor;
return 1;
}
/* Checking the number of arguments and allocating args */
if(*cursor != ARGLISTOPENSYM && tag_args[0] != '|')
{
skin_error(ARGLIST_EXPECTED, cursor);
return 0;
}
else
{
cursor++;
}
bookmark = cursor;
while(*cursor != '\n' && *cursor != '\0' && *cursor != ARGLISTCLOSESYM)
{
/* Skipping over escaped characters */
if(*cursor == TAGSYM && *(cursor+1) != ARGLISTSEPARATESYM)
{
skip_tag(&cursor);
}
else if(*cursor == COMMENTSYM)
{
skip_comment(&cursor);
}
else if(*cursor == ARGLISTSEPARATESYM)
{
num_args++;
cursor++;
}
else
{
cursor++;
}
}
cursor = bookmark; /* Restoring the cursor */
element->params_count = num_args;
params = skin_alloc_params(num_args);
if (!params)
return 0;
/* Now we have to actually parse each argument */
for(i = 0; i < num_args; i++)
{
char type_code;
/* Making sure we haven't run out of arguments */
if(*tag_args == '\0')
{
skin_error(TOO_MANY_ARGS, cursor);
return 0;
}
/* Checking for the optional bar */
if(*tag_args == '|')
{
optional = 1;
tag_args++;
}
/* Scanning the arguments */
skip_whitespace(&cursor);
/* Checking for comments */
if(*cursor == COMMENTSYM)
skip_comment(&cursor);
if (*tag_args == '[')
{
/* we need to guess which type of param it is.
* guess using this priority:
* default > decimal/integer > single tag/code > string
*/
int j=0;
bool canbedefault = false, last_char_is_percent = false;
bool haspercent = false, number = true, hasdecimal = false;
char temp_params[8];
open_square_bracket = tag_args;
tag_args++;
while (*tag_args != ']')
{
if (*tag_args >= 'a' && *tag_args <= 'z')
canbedefault = true;
temp_params[j++] = tolower(*tag_args++);
}
temp_params[j] = '\0';
j = 0;
while (cursor[j] && cursor[j] != ',' && cursor[j] != ')')
{
haspercent = haspercent || (cursor[j] == '%');
hasdecimal = hasdecimal || (cursor[j] == '.');
number = number && (isdigit(cursor[j]) ||
(cursor[j] == '.') ||
(cursor[j] == '-') ||
(cursor[j] == '%'));
j++;
}
last_char_is_percent = cursor[j-1] == '%';
type_code = '?';
if (canbedefault && *cursor == DEFAULTSYM && !isdigit(cursor[1]))
{
type_code = 'i';
}
else if (number && hasdecimal && strchr(temp_params, 'd'))
{
type_code = 'd';
}
else if (number && last_char_is_percent && strchr(temp_params, 'p'))
{
type_code = 'p';
}
else if (number &&
(strchr(temp_params, 'i') || strchr(temp_params, 'd')))
{
type_code = strchr(temp_params, 'i') ? 'i' : 'd';
}
else if (haspercent &&
(strchr(temp_params, 't') || strchr(temp_params, 'c')))
{
type_code = strchr(temp_params, 't') ? 't' : 'c';
}
else if (strchr(temp_params, 's'))
{
type_code = 's';
}
if (type_code == '?')
{
skin_error(INSUFFICIENT_ARGS, cursor);
return 0;
}
}
else
type_code = *tag_args;
/* Storing the type code */
params[i].type_code = type_code;
/* Checking a nullable argument for null. */
if(*cursor == DEFAULTSYM && !isdigit(cursor[1]))
{
if(islower(type_code))
{
params[i].type = DEFAULT;
cursor++;
}
else
{
skin_error(DEFAULT_NOT_ALLOWED, cursor);
return 0;
}
}
else if(tolower(type_code) == 'i')
{
/* Scanning an int argument */
if(!isdigit(*cursor) && *cursor != '-')
{
skin_error(INT_EXPECTED, cursor);
return 0;
}
params[i].type = INTEGER;
params[i].data.number = scan_int(&cursor);
}
else if(tolower(type_code) == 'd' || tolower(type_code) == 'p')
{
int val = 0;
bool have_point = false;
bool have_tenth = false;
while ( isdigit(*cursor) || *cursor == '.' )
{
if (*cursor != '.')
{
val *= 10;
val += *cursor - '0';
if (have_point)
{
have_tenth = true;
cursor++;
break;
}
}
else
have_point = true;
cursor++;
}
if (have_tenth == false)
val *= 10;
if (tolower(type_code) == 'd')
params[i].type = DECIMAL;
else
{
params[i].type = PERCENT;
cursor++; /* skip trailing % sign */
}
params[i].data.number = val;
}
else if(tolower(type_code) == 's' || tolower(type_code) == 'f')
{
/* Scanning a string argument */
params[i].type = STRING;
params[i].data.text = skin_buffer_to_offset(scan_string(&cursor));
}
else if(tolower(type_code) == 'c')
{
/* Recursively parsing a code argument */
params[i].type = CODE;
params[i].data.code = skin_buffer_to_offset(skin_parse_code_as_arg(&cursor));
if(params[i].data.code < 0)
return 0;
}
else if (tolower(type_code) == 't')
{
struct skin_element* child = skin_alloc_element();
child->type = TAG;
if (!skin_parse_tag(child, &cursor))
return 0;
child->next = skin_buffer_to_offset(NULL);
params[i].type = CODE;
params[i].data.code = skin_buffer_to_offset(child);
}
skip_whitespace(&cursor);
if(*cursor != ARGLISTSEPARATESYM && i < num_args - 1)
{
skin_error(SEPARATOR_EXPECTED, cursor);
return 0;
}
else if(*cursor != ARGLISTCLOSESYM && i == num_args - 1)
{
skin_error(CLOSE_EXPECTED, cursor);
return 0;
}
else
{
cursor++;
}
if (*(tag_args + 1) == '*')
{
if (i+1 == num_args)
tag_args += 2;
else if (open_square_bracket && *tag_args == ']')
{
tag_args = open_square_bracket;
open_square_bracket = NULL;
}
}
else
tag_args++;
/* Checking for the optional bar */
if(*tag_args == '|')
{
optional = 1;
tag_args++;
}
}
element->params = skin_buffer_to_offset(params);
/* Checking for a premature end */
if(*tag_args != '\0' && !optional)
{
skin_error(INSUFFICIENT_ARGS, cursor);
return 0;
}
#ifdef ROCKBOX
if (callback)
{
if (callback(element, callback_data) == CALLBACK_ERROR)
{
skin_error(GOT_CALLBACK_ERROR, *document);
return 0;
}
}
#endif
*document = cursor;
return 1;
}
/*
* If the conditional flag is set true, then parsing text will stop at an
* ARGLISTSEPARATESYM. Only set that flag when parsing within a conditional
*/
static int skin_parse_text(struct skin_element* element, const char** document,
int conditional)
{
const char* cursor = *document;
int length = 0;
int dest;
char *text = NULL;
/* First figure out how much text we're copying */
while(*cursor != '\0' && *cursor != '\n' && *cursor != MULTILINESYM
&& *cursor != COMMENTSYM
&& !((*cursor == ARGLISTSEPARATESYM
|| *cursor == ARGLISTCLOSESYM
|| *cursor == ENUMLISTSEPARATESYM
|| *cursor == ENUMLISTCLOSESYM)
&& conditional))
{
/* Dealing with possibility of escaped characters */
if(*cursor == TAGSYM)
{
if(find_escape_character(cursor[1]))
cursor++;
else
break;
}
length++;
cursor++;
}
cursor = *document;
/* Copying the text into the element struct */
element->type = TEXT;
element->line = skin_line;
element->next = skin_buffer_to_offset(NULL);
text = skin_alloc_string(length);
element->data = skin_buffer_to_offset(text);
if (element->data < 0)
return 0;
for(dest = 0; dest < length; dest++)
{
/* Advancing cursor if we've encountered an escaped character */
if(*cursor == TAGSYM)
cursor++;
text[dest] = *cursor;
cursor++;
}
text[length] = '\0';
#ifdef ROCKBOX
if (callback)
{
if (callback(element, callback_data) == CALLBACK_ERROR)
{
skin_error(GOT_CALLBACK_ERROR, *document);
return 0;
}
}
#endif
*document = cursor;
return 1;
}
static int skin_parse_conditional(struct skin_element* element, const char** document)
{
const char* cursor = *document + 1; /* Starting past the "%" */
const char* bookmark;
int children = 1;
int i;
#ifdef ROCKBOX
bool feature_available = true;
const char *false_branch = NULL;
const char *conditional_end = NULL;
#endif
OFFSETTYPE(struct skin_element*)* children_array = NULL;
/* Some conditional tags allow for target feature checking,
* so to handle that call the callback as usual with type == TAG
* then call it a second time with type == CONDITIONAL and check the return
* value */
element->type = TAG;
element->line = skin_line;
/* Parsing the tag first */
if(!skin_parse_tag(element, &cursor))
return 0;
element->type = CONDITIONAL;
#ifdef ROCKBOX
if (callback)
{
switch (callback(element, callback_data))
{
case FEATURE_NOT_AVAILABLE:
feature_available = false;
break;
case CALLBACK_ERROR:
return 0;
default:
break;
}
}
#endif
/* Counting the children */
if(*(cursor++) != ENUMLISTOPENSYM)
{
skin_error(ARGLIST_EXPECTED, cursor);
return 0;
}
bookmark = cursor;
while(*cursor != ENUMLISTCLOSESYM && *cursor != '\0')
{
if(*cursor == COMMENTSYM)
{
skip_comment(&cursor);
}
else if(*cursor == TAGSYM)
{
skip_tag(&cursor);
}
else if(*cursor == ENUMLISTSEPARATESYM)
{
children++;
cursor++;
if (*cursor == '\n')
cursor++;
#ifdef ROCKBOX
if (false_branch == NULL && !feature_available)
{
false_branch = cursor;
children--;
}
#endif
}
else
{
cursor++;
}
}
#ifdef ROCKBOX
if (*cursor == ENUMLISTCLOSESYM &&
false_branch == NULL && !feature_available)
{
false_branch = cursor+1;
children--;
}
if (element->tag->flags&FEATURE_TAG)
{
if (feature_available && children > 1)
children--;
}
conditional_end = cursor;
/* if we are skipping the true branch fix that up */
cursor = false_branch ? false_branch : bookmark;
#else
cursor = bookmark;
#endif
/* Parsing the children */
/* Feature tags could end up having 0 children which breaks
* the render in dangerous ways. Minor hack, but insert an empty
* child. (e.g %?xx<foo> when xx isnt available ) */
if (children == 0)
{
const char* emptyline= "";
children = 1;
children_array = skin_alloc_children(children);
if (!children_array)
return 0;
element->children_count = children;
children_array[0] = skin_buffer_to_offset(skin_parse_code_as_arg(&emptyline));
}
else
{
children_array = skin_alloc_children(children);
if (!children_array)
return 0;
element->children_count = children;
for(i = 0; i < children; i++)
{
if (*cursor == '\n')
{
skin_line++;
cursor++;
}
children_array[i] = skin_buffer_to_offset(skin_parse_code_as_arg(&cursor));
if (children_array[i] < 0)
return 0;
skip_whitespace(&cursor);
#ifdef ROCKBOX
if ((element->tag->flags&FEATURE_TAG) && feature_available)
cursor = conditional_end;
#endif
if(i < children - 1 && *cursor != ENUMLISTSEPARATESYM)
{
skin_error(SEPARATOR_EXPECTED, cursor);
return 0;
}
else if(i == children - 1 && *cursor != ENUMLISTCLOSESYM)
{
skin_error(CLOSE_EXPECTED, cursor);
return 0;
}
else
{
cursor++;
}
}
}
*document = cursor;
element->children = skin_buffer_to_offset(children_array);
return 1;
}
static int skin_parse_comment(struct skin_element* element, const char** document)
{
const char* cursor = *document;
#ifndef ROCKBOX
char* text = NULL;
#endif
int length;
/*
* Finding the index of the ending newline or null-terminator
* The length of the string of interest doesn't include the leading #, the
* length we need to reserve is the same as the index of the last character
*/
for(length = 0; cursor[length] != '\n' && cursor[length] != '\0'; length++);
element->type = COMMENT;
element->line = skin_line;
#ifdef ROCKBOX
element->data = INVALID_OFFSET;
#else
element->data = text = skin_alloc_string(length);
if (!element->data)
return 0;
/* We copy from one char past cursor to leave out the # */
memcpy((void*)text, (void*)(cursor + 1),
sizeof(char) * (length-1));
text[length - 1] = '\0';
#endif
if(cursor[length] == '\n')
skin_line++;
*document += (length); /* Move cursor up past # and all text */
if(**document == '\n')
(*document)++;
return 1;
}
static struct skin_element* skin_parse_code_as_arg(const char** document)
{
int sublines = 0;
const char* cursor = *document;
/* Checking for sublines */
while(*cursor != '\n' && *cursor != '\0'
&& *cursor != ENUMLISTSEPARATESYM && *cursor != ARGLISTSEPARATESYM
&& *cursor != ENUMLISTCLOSESYM && *cursor != ARGLISTCLOSESYM)
{
if(*cursor == MULTILINESYM)
{
sublines = 1;
break;
}
else if(*cursor == TAGSYM)
{
skip_tag(&cursor);
}
else
{
/* Advancing the cursor as normal */
cursor++;
}
}
if(sublines)
return skin_parse_sublines_optional(document, 1);
else
return skin_parse_line_optional(document, 1);
}
/* Memory management */
static struct skin_element* skin_alloc_element()
{
struct skin_element* retval = (struct skin_element*)
skin_buffer_alloc(sizeof(struct skin_element));
if (!retval)
return NULL;
retval->type = UNKNOWN;
retval->next = skin_buffer_to_offset(NULL);
retval->params = skin_buffer_to_offset(NULL);
retval->tag = NULL;
retval->params_count = 0;
retval->children_count = 0;
retval->data = INVALID_OFFSET;
return retval;
}
/* On a ROCKBOX build we try to save space as much as possible
* so if we can, use a shared param pool which should be more then large
* enough for any tag. params should be used straight away by the callback
* so this is safe.
*/
static struct skin_tag_parameter* skin_alloc_params(int count)
{
size_t size = sizeof(struct skin_tag_parameter) * count;
return (struct skin_tag_parameter*)skin_buffer_alloc(size);
}
char* skin_alloc_string(int length)
{
return (char*)skin_buffer_alloc(sizeof(char) * (length + 1));
}
static OFFSETTYPE(struct skin_element*)* skin_alloc_children(int count)
{
return (OFFSETTYPE(struct skin_element*)*)
skin_buffer_alloc(sizeof(struct skin_element*) * count);
}
void skin_free_tree(struct skin_element* root)
{
#ifndef ROCKBOX
int i;
/* First make the recursive call */
if(!root)
return;
skin_free_tree(root->next);
/* Free any text */
if(root->type == TEXT || root->type == COMMENT)
free(root->data);
/* Then recursively free any children, before freeing their pointers */
for(i = 0; i < root->children_count; i++)
skin_free_tree(root->children[i]);
if(root->children_count > 0)
free(root->children);
/* Free any parameters, making sure to deallocate strings */
for(i = 0; i < root->params_count; i++)
if(root->params[i].type == STRING)
free(root->params[i].data.text);
if(root->params_count > 0)
free(root->params);
/* Finally, delete root's memory */
free(root);
#else
(void)root;
#endif
}
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