514 lines
9.9 KiB
C++
514 lines
9.9 KiB
C++
// q_parse.c -- support for parsing text files
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#include "q_shared.h"
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/*
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============================================================================
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PARSING
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============================================================================
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*/
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// multiple character punctuation tokens
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static const char *punctuation[] = {
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"+=", "-=", "*=", "/=", "&=", "|=", "++", "--",
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"&&", "||", "<=", ">=", "==", "!=",
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NULL
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};
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typedef struct {
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char token[MAX_TOKEN_CHARS];
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int lines;
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qboolean ungetToken;
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char parseFile[MAX_QPATH];
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} parseInfo_t;
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#define MAX_PARSE_INFO 16
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static parseInfo_t parseInfo[MAX_PARSE_INFO];
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static int parseInfoNum;
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static parseInfo_t *pi = &parseInfo[0];
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/*
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===================
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Com_BeginParseSession
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===================
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*/
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void Com_BeginParseSession( const char *filename ) {
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if ( parseInfoNum == MAX_PARSE_INFO - 1 ) {
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Com_Error( ERR_FATAL, "Com_BeginParseSession: session overflow" );
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}
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parseInfoNum++;
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pi = &parseInfo[parseInfoNum];
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pi->lines = 1;
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Q_strncpyz( pi->parseFile, filename, sizeof( pi->parseFile ) );
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}
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/*
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===================
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Com_EndParseSession
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===================
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*/
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void Com_EndParseSession( void ) {
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if ( parseInfoNum == 0 ) {
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Com_Error( ERR_FATAL, "Com_EndParseSession: session underflow" );
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}
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parseInfoNum--;
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pi = &parseInfo[parseInfoNum];
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}
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/*
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===================
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Com_GetCurrentParseLine
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===================
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*/
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int Com_GetCurrentParseLine( void ) {
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return pi->lines;
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}
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/*
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===================
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Com_ScriptError
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Prints the script name and line number in the message
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===================
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*/
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void Com_ScriptError( const char *msg, ... ) {
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va_list argptr;
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char string[32000];
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va_start( argptr, msg );
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vsprintf( string, msg,argptr );
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va_end( argptr );
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Com_Error( ERR_DROP, "File %s, line %i: %s", pi->parseFile, pi->lines, string );
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}
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void Com_ScriptWarning( const char *msg, ... ) {
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va_list argptr;
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char string[32000];
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va_start( argptr, msg );
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vsprintf( string, msg,argptr );
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va_end( argptr );
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Com_Printf( "File %s, line %i: %s", pi->parseFile, pi->lines, string );
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}
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/*
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===================
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Com_UngetToken
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Calling this will make the next Com_Parse return
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the current token instead of advancing the pointer
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===================
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*/
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void Com_UngetToken( void ) {
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if ( pi->ungetToken ) {
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Com_ScriptError( "UngetToken called twice" );
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}
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pi->ungetToken = qtrue;
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}
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static const char *SkipWhitespace( const char (*data), qboolean *hasNewLines ) {
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int c;
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while( (c = *data) <= ' ') {
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if( !c ) {
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return NULL;
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}
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if( c == '\n' ) {
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pi->lines++;
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*hasNewLines = qtrue;
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}
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data++;
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}
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return data;
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}
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/*
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==============
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Com_ParseExt
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Parse a token out of a string
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Will never return NULL, just empty strings.
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An empty string will only be returned at end of file.
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If "allowLineBreaks" is qtrue then an empty
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string will be returned if the next token is
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a newline.
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==============
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*/
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static char *Com_ParseExt( const char *(*data_p), qboolean allowLineBreaks ) {
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int c = 0, len;
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qboolean hasNewLines = qfalse;
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const char *data;
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const char **punc;
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if ( !data_p ) {
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Com_Error( ERR_FATAL, "Com_ParseExt: NULL data_p" );
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}
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data = *data_p;
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len = 0;
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pi->token[0] = 0;
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// make sure incoming data is valid
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if ( !data ) {
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*data_p = NULL;
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return pi->token;
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}
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// skip any leading whitespace
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while ( 1 ) {
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// skip whitespace
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data = SkipWhitespace( data, &hasNewLines );
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if ( !data ) {
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*data_p = NULL;
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return pi->token;
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}
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if ( hasNewLines && !allowLineBreaks ) {
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*data_p = data;
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return pi->token;
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}
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c = *data;
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// skip double slash comments
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if ( c == '/' && data[1] == '/' ) {
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while (*data && *data != '\n') {
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data++;
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}
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continue;
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}
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// skip /* */ comments
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if ( c=='/' && data[1] == '*' ) {
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while ( *data && ( *data != '*' || data[1] != '/' ) ) {
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if( *data == '\n' ) {
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pi->lines++;
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}
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data++;
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}
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if ( *data ) {
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data += 2;
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}
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continue;
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}
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// a real token to parse
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break;
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}
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// handle quoted strings
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if ( c == '\"' ) {
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data++;
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while( 1 ) {
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c = *data++;
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if ( ( c=='\\' ) && ( *data == '\"' ) ) {
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// allow quoted strings to use \" to indicate the " character
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data++;
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} else if ( c=='\"' || !c ) {
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pi->token[len] = 0;
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*data_p = ( char * ) data;
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return pi->token;
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} else if( *data == '\n' ) {
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pi->lines++;
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}
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if ( len < MAX_TOKEN_CHARS - 1 ) {
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pi->token[len] = c;
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len++;
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}
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}
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}
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// check for a number
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// is this parsing of negative numbers going to cause expression problems
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if ( ( c >= '0' && c <= '9' ) || ( c == '-' && data[ 1 ] >= '0' && data[ 1 ] <= '9' ) ||
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( c == '.' && data[ 1 ] >= '0' && data[ 1 ] <= '9' ) ) {
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do {
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if (len < MAX_TOKEN_CHARS - 1) {
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pi->token[len] = c;
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len++;
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}
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data++;
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c = *data;
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} while ( ( c >= '0' && c <= '9' ) || c == '.' );
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// parse the exponent
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if ( c == 'e' || c == 'E' ) {
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if (len < MAX_TOKEN_CHARS - 1) {
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pi->token[len] = c;
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len++;
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}
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data++;
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c = *data;
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if ( c == '-' || c == '+' ) {
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if (len < MAX_TOKEN_CHARS - 1) {
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pi->token[len] = c;
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len++;
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}
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data++;
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c = *data;
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}
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do {
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if (len < MAX_TOKEN_CHARS - 1) {
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pi->token[len] = c;
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len++;
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}
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data++;
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c = *data;
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} while ( c >= '0' && c <= '9' );
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}
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if (len == MAX_TOKEN_CHARS) {
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len = 0;
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}
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pi->token[len] = 0;
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*data_p = ( char * ) data;
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return pi->token;
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}
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// check for a regular word
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// we still allow forward and back slashes in name tokens for pathnames
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// and also colons for drive letters
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if ( ( c >= 'a' && c <= 'z' ) || ( c >= 'A' && c <= 'Z' ) || c == '_' || c == '/' || c == '\\' ) {
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do {
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if (len < MAX_TOKEN_CHARS - 1) {
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pi->token[len] = c;
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len++;
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}
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data++;
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c = *data;
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} while ( ( c >= 'a' && c <= 'z' ) || ( c >= 'A' && c <= 'Z' ) || c == '_'
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|| ( c >= '0' && c <= '9' ) || c == '/' || c == '\\' || c == ':' || c == '.' );
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if (len == MAX_TOKEN_CHARS) {
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len = 0;
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}
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pi->token[len] = 0;
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*data_p = ( char * ) data;
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return pi->token;
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}
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// check for multi-character punctuation token
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for ( punc = punctuation ; *punc ; punc++ ) {
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int l;
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int j;
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l = strlen( *punc );
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for ( j = 0 ; j < l ; j++ ) {
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if ( data[j] != (*punc)[j] ) {
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break;
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}
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}
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if ( j == l ) {
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// a valid multi-character punctuation
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memcpy( pi->token, *punc, l );
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pi->token[l] = 0;
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data += l;
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*data_p = (char *)data;
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return pi->token;
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}
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}
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// single character punctuation
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pi->token[0] = *data;
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pi->token[1] = 0;
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data++;
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*data_p = (char *)data;
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return pi->token;
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}
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/*
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===================
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Com_Parse
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===================
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*/
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const char *Com_Parse( const char *(*data_p) ) {
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if ( pi->ungetToken ) {
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pi->ungetToken = qfalse;
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return pi->token;
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}
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return Com_ParseExt( data_p, qtrue );
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}
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/*
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===================
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Com_ParseOnLine
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===================
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*/
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const char *Com_ParseOnLine( const char *(*data_p) ) {
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if ( pi->ungetToken ) {
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pi->ungetToken = qfalse;
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return pi->token;
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}
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return Com_ParseExt( data_p, qfalse );
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}
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/*
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==================
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Com_MatchToken
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==================
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*/
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void Com_MatchToken( const char *(*buf_p), const char *match, qboolean warning ) {
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const char *token;
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token = Com_Parse( buf_p );
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if ( strcmp( token, match ) ) {
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if (warning) {
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Com_ScriptWarning( "MatchToken: %s != %s", token, match );
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} else {
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Com_ScriptError( "MatchToken: %s != %s", token, match );
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}
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}
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}
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/*
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=================
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Com_SkipBracedSection
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The next token should be an open brace.
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Skips until a matching close brace is found.
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Internal brace depths are properly skipped.
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=================
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*/
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void Com_SkipBracedSection( const char *(*program) ) {
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const char *token;
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int depth;
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depth = 0;
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do {
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token = Com_Parse( program );
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if( token[1] == 0 ) {
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if( token[0] == '{' ) {
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depth++;
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}
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else if( token[0] == '}' ) {
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depth--;
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}
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}
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} while( depth && *program );
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}
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/*
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=================
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Com_SkipRestOfLine
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=================
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*/
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void Com_SkipRestOfLine ( const char *(*data) ) {
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const char *p;
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int c;
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p = *data;
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while ( (c = *p++) != 0 ) {
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if ( c == '\n' ) {
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pi->lines++;
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break;
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}
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}
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*data = p;
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}
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/*
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====================
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Com_ParseRestOfLine
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====================
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*/
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const char *Com_ParseRestOfLine( const char *(*data_p) ) {
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static char line[MAX_TOKEN_CHARS];
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const char *token;
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line[0] = 0;
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while( 1 ) {
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token = Com_ParseOnLine( data_p );
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if ( !token[0] ) {
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break;
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}
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if ( line[0] ) {
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Q_strcat( line, sizeof(line), " " );
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}
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Q_strcat( line, sizeof(line), token );
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}
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return line;
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}
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float Com_ParseFloat( const char *(*buf_p) ) {
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const char *token;
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token = Com_Parse( buf_p );
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if ( !token[0] ) {
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return 0;
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}
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return atof( token );
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}
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int Com_ParseInt( const char *(*buf_p) ) {
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const char *token;
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token = Com_Parse( buf_p );
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if ( !token[0] ) {
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return 0;
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}
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return atoi( token );
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}
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void Com_Parse1DMatrix( const char *(*buf_p), int x, float *m ) {
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const char *token;
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int i;
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Com_MatchToken( buf_p, "(" );
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for (i = 0 ; i < x ; i++) {
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token = Com_Parse(buf_p);
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m[i] = atof(token);
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}
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Com_MatchToken( buf_p, ")" );
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}
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void Com_Parse2DMatrix( const char *(*buf_p), int y, int x, float *m ) {
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int i;
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Com_MatchToken( buf_p, "(" );
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for (i = 0 ; i < y ; i++) {
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Com_Parse1DMatrix (buf_p, x, m + i * x);
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}
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Com_MatchToken( buf_p, ")" );
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}
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void Com_Parse3DMatrix( const char *(*buf_p), int z, int y, int x, float *m ) {
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int i;
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Com_MatchToken( buf_p, "(" );
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for (i = 0 ; i < z ; i++) {
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Com_Parse2DMatrix (buf_p, y, x, m + i * x*y);
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}
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Com_MatchToken( buf_p, ")" );
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}
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