diff options
author | SmileTheory <SmileTheory@gmail.com> | 2016-02-10 16:25:32 -0800 |
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committer | Tim Angus <tim@ngus.net> | 2016-04-07 11:54:13 +0100 |
commit | e4a4b0b57899bde1f35565e18bcb9bb1b06f6320 (patch) | |
tree | 82dbf87041fc9d385223cfac1be0926c6c2b66c1 /src/qcommon | |
parent | d5ba7bb70ef327c8856165475b58e946c8fbd8ce (diff) |
OpenGL2: Add named cubemaps and per-map env.json parsing.
Diffstat (limited to 'src/qcommon')
-rw-r--r-- | src/qcommon/json.h | 353 |
1 files changed, 353 insertions, 0 deletions
diff --git a/src/qcommon/json.h b/src/qcommon/json.h new file mode 100644 index 00000000..cfc5b3ca --- /dev/null +++ b/src/qcommon/json.h @@ -0,0 +1,353 @@ +/* +=========================================================================== +Copyright (C) 2016 James Canete + +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 program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program; if not, write to the Free Software +Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. +=========================================================================== +*/ + +#ifndef JSON_H +#define JSON_H + +enum +{ + JSONTYPE_STRING, // string + JSONTYPE_OBJECT, // object + JSONTYPE_ARRAY, // array + JSONTYPE_VALUE, // number, true, false, or null + JSONTYPE_ERROR // out of data +}; + +// -------------------------------------------------------------------------- +// Array Functions +// -------------------------------------------------------------------------- + +// Get pointer to first value in array +// When given pointer to an array, returns pointer to the first +// returns NULL if array is empty or not an array. +const char *JSON_ArrayGetFirstValue(const char *json, const char *jsonEnd); + +// Get pointer to next value in array +// When given pointer to a value, returns pointer to the next value +// returns NULL when no next value. +const char *JSON_ArrayGetNextValue(const char *json, const char *jsonEnd); + +// Get pointers to values in an array +// returns 0 if not an array, array is empty, or out of data +// returns number of values in the array and copies into index if successful +unsigned int JSON_ArrayGetIndex(const char *json, const char *jsonEnd, const char **indexes, unsigned int numIndexes); + +// Get pointer to indexed value from array +// returns NULL if not an array, no index, or out of data +const char *JSON_ArrayGetValue(const char *json, const char *jsonEnd, unsigned int index); + +// -------------------------------------------------------------------------- +// Object Functions +// -------------------------------------------------------------------------- + +// Get pointer to named value from object +// returns NULL if not an object, name not found, or out of data +const char *JSON_ObjectGetNamedValue(const char *json, const char *jsonEnd, const char *name); + +// -------------------------------------------------------------------------- +// Value Functions +// -------------------------------------------------------------------------- + +// Get type of value +// returns JSONTYPE_ERROR if out of data +unsigned int JSON_ValueGetType(const char *json, const char *jsonEnd); + +// Get value as string +// returns 0 if out of data +// returns length and copies into string if successful, including terminating nul. +// string values are stripped of enclosing quotes but not escaped +unsigned int JSON_ValueGetString(const char *json, const char *jsonEnd, char *outString, unsigned int stringLen); + +// Get value as appropriate type +// returns 0 if value is false, value is null, or out of data +// returns 1 if value is true +// returns value otherwise +double JSON_ValueGetDouble(const char *json, const char *jsonEnd); +float JSON_ValueGetFloat(const char *json, const char *jsonEnd); +int JSON_ValueGetInt(const char *json, const char *jsonEnd); + +#endif + +#ifdef JSON_IMPLEMENTATION +#include <stdio.h> + +// -------------------------------------------------------------------------- +// Internal Functions +// -------------------------------------------------------------------------- + +static const char *JSON_SkipSeparators(const char *json, const char *jsonEnd); +static const char *JSON_SkipString(const char *json, const char *jsonEnd); +static const char *JSON_SkipStruct(const char *json, const char *jsonEnd); +static const char *JSON_SkipValue(const char *json, const char *jsonEnd); +static const char *JSON_SkipValueAndSeparators(const char *json, const char *jsonEnd); + +#define IS_SEPARATOR(x) ((x) == ' ' || (x) == '\t' || (x) == '\n' || (x) == '\r' || (x) == ',' || (x) == ':') +#define IS_STRUCT_OPEN(x) ((x) == '{' || (x) == '[') +#define IS_STRUCT_CLOSE(x) ((x) == '}' || (x) == ']') + +static const char *JSON_SkipSeparators(const char *json, const char *jsonEnd) +{ + while (json < jsonEnd && IS_SEPARATOR(*json)) + json++; + + return json; +} + +static const char *JSON_SkipString(const char *json, const char *jsonEnd) +{ + for (json++; json < jsonEnd && *json != '"'; json++) + if (*json == '\\') + json++; + + return (json + 1 > jsonEnd) ? jsonEnd : json + 1; +} + +static const char *JSON_SkipStruct(const char *json, const char *jsonEnd) +{ + json = JSON_SkipSeparators(json + 1, jsonEnd); + while (json < jsonEnd && !IS_STRUCT_CLOSE(*json)) + json = JSON_SkipValueAndSeparators(json, jsonEnd); + + return (json + 1 > jsonEnd) ? jsonEnd : json + 1; +} + +static const char *JSON_SkipValue(const char *json, const char *jsonEnd) +{ + if (json >= jsonEnd) + return jsonEnd; + else if (*json == '"') + json = JSON_SkipString(json, jsonEnd); + else if (IS_STRUCT_OPEN(*json)) + json = JSON_SkipStruct(json, jsonEnd); + else + { + while (json < jsonEnd && !IS_SEPARATOR(*json) && !IS_STRUCT_CLOSE(*json)) + json++; + } + + return json; +} + +static const char *JSON_SkipValueAndSeparators(const char *json, const char *jsonEnd) +{ + json = JSON_SkipValue(json, jsonEnd); + return JSON_SkipSeparators(json, jsonEnd); +} + +// returns 0 if value requires more parsing, 1 if no more data/false/null, 2 if true +static unsigned int JSON_NoParse(const char *json, const char *jsonEnd) +{ + if (!json || json >= jsonEnd || *json == 'f' || *json == 'n') + return 1; + + if (*json == 't') + return 2; + + return 0; +} + +// -------------------------------------------------------------------------- +// Array Functions +// -------------------------------------------------------------------------- + +const char *JSON_ArrayGetFirstValue(const char *json, const char *jsonEnd) +{ + if (!json || json >= jsonEnd || !IS_STRUCT_OPEN(*json)) + return NULL; + + json = JSON_SkipSeparators(json + 1, jsonEnd); + + return (json >= jsonEnd || IS_STRUCT_CLOSE(*json)) ? NULL : json; +} + +const char *JSON_ArrayGetNextValue(const char *json, const char *jsonEnd) +{ + if (!json || json >= jsonEnd || IS_STRUCT_CLOSE(*json)) + return NULL; + + json = JSON_SkipValueAndSeparators(json, jsonEnd); + + return (json >= jsonEnd || IS_STRUCT_CLOSE(*json)) ? NULL : json; +} + +unsigned int JSON_ArrayGetIndex(const char *json, const char *jsonEnd, const char **indexes, unsigned int numIndexes) +{ + unsigned int length = 0; + + for (json = JSON_ArrayGetFirstValue(json, jsonEnd); json; json = JSON_ArrayGetNextValue(json, jsonEnd)) + { + if (indexes && numIndexes) + { + *indexes++ = json; + numIndexes--; + } + length++; + } + + return length; +} + +const char *JSON_ArrayGetValue(const char *json, const char *jsonEnd, unsigned int index) +{ + for (json = JSON_ArrayGetFirstValue(json, jsonEnd); json && index; json = JSON_ArrayGetNextValue(json, jsonEnd)) + index--; + + return json; +} + +// -------------------------------------------------------------------------- +// Object Functions +// -------------------------------------------------------------------------- + +const char *JSON_ObjectGetNamedValue(const char *json, const char *jsonEnd, const char *name) +{ + unsigned int nameLen = strlen(name); + + for (json = JSON_ArrayGetFirstValue(json, jsonEnd); json; json = JSON_ArrayGetNextValue(json, jsonEnd)) + { + if (*json == '"') + { + const char *thisNameStart, *thisNameEnd; + + thisNameStart = json + 1; + json = JSON_SkipString(json, jsonEnd); + thisNameEnd = json - 1; + json = JSON_SkipSeparators(json, jsonEnd); + + if ((unsigned int)(thisNameEnd - thisNameStart) == nameLen) + if (strncmp(thisNameStart, name, nameLen) == 0) + return json; + } + } + + return NULL; +} + +// -------------------------------------------------------------------------- +// Value Functions +// -------------------------------------------------------------------------- + +unsigned int JSON_ValueGetType(const char *json, const char *jsonEnd) +{ + if (!json || json >= jsonEnd) + return JSONTYPE_ERROR; + else if (*json == '"') + return JSONTYPE_STRING; + else if (*json == '{') + return JSONTYPE_OBJECT; + else if (*json == '[') + return JSONTYPE_ARRAY; + + return JSONTYPE_VALUE; +} + +unsigned int JSON_ValueGetString(const char *json, const char *jsonEnd, char *outString, unsigned int stringLen) +{ + const char *stringEnd, *stringStart; + + if (!json) + { + *outString = '\0'; + return 0; + } + + stringStart = json; + stringEnd = JSON_SkipValue(stringStart, jsonEnd); + if (stringEnd >= jsonEnd) + { + *outString = '\0'; + return 0; + } + + // skip enclosing quotes if they exist + if (*stringStart == '"') + stringStart++; + + if (*(stringEnd - 1) == '"') + stringEnd--; + + stringLen--; + if (stringLen > stringEnd - stringStart) + stringLen = stringEnd - stringStart; + + json = stringStart; + while (stringLen--) + *outString++ = *json++; + *outString = '\0'; + + return stringEnd - stringStart; +} + +double JSON_ValueGetDouble(const char *json, const char *jsonEnd) +{ + char cValue[256]; + double dValue = 0.0; + unsigned int np = JSON_NoParse(json, jsonEnd); + + if (np) + return (double)(np - 1); + + if (!JSON_ValueGetString(json, jsonEnd, cValue, 256)) + return 0.0; + + sscanf(cValue, "%lf", &dValue); + + return dValue; +} + +float JSON_ValueGetFloat(const char *json, const char *jsonEnd) +{ + char cValue[256]; + float fValue = 0.0f; + unsigned int np = JSON_NoParse(json, jsonEnd); + + if (np) + return (float)(np - 1); + + if (!JSON_ValueGetString(json, jsonEnd, cValue, 256)) + return 0.0f; + + sscanf(cValue, "%f", &fValue); + + return fValue; +} + +int JSON_ValueGetInt(const char *json, const char *jsonEnd) +{ + char cValue[256]; + int iValue = 0; + unsigned int np = JSON_NoParse(json, jsonEnd); + + if (np) + return np - 1; + + if (!JSON_ValueGetString(json, jsonEnd, cValue, 256)) + return 0; + + sscanf(cValue, "%d", &iValue); + + return iValue; +} + +#undef IS_SEPARATOR +#undef IS_STRUCT_OPEN +#undef IS_STRUCT_CLOSE + +#endif |