snapshot of project "lynx", label v2-8-8dev_3c

1 files changed, 142 insertions, 0 deletions

diff --git a/WWW/Library/Implementation/HTLex.c b/WWW/Library/Implementation/HTLex.c
new file mode 100644
index 00000000..5a0df917
--- /dev/null
+++ b/WWW/Library/Implementation/HTLex.c
@@ -0,0 +1,142 @@
+
+/* MODULE							HTLex.c
+ *		LEXICAL ANALYSOR
+ *
+ * AUTHORS:
+ *	AL	Ari Luotonen	luotonen@dxcern.cern.ch
+ *
+ * HISTORY:
+ *
+ *
+ * BUGS:
+ *
+ *
+ */
+
+#include <HTUtils.h>
+
+#include <HTLex.h>		/* Implemented here */
+
+#include <LYLeaks.h>
+
+/*
+ * Global variables
+ */
+char HTlex_buffer[40];		/* Read lexical string          */
+int HTlex_line = 1;		/* Line number in source file   */
+
+/*
+ * Module-wide variables
+ */
+static int lex_cnt;
+static BOOL lex_template;
+static LexItem lex_pushed_back = LEX_NONE;
+static FILE *cache = NULL;
+
+void unlex(LexItem lex_item)
+{
+    lex_pushed_back = lex_item;
+}
+
+LexItem lex(FILE *fp)
+{
+    int ch = 0;
+
+    if (fp != cache) {		/* This cache doesn't work ok because the system  */
+	cache = fp;		/* often assign same FILE structure the next open */
+	HTlex_line = 1;		/* file.  So, if there are syntax errors in setup *
+				   files it may confuse things later on.      */
+    }
+    if (lex_pushed_back != LEX_NONE) {
+	LexItem ret = lex_pushed_back;
+
+	lex_pushed_back = LEX_NONE;
+	return ret;
+    }
+
+    lex_cnt = 0;
+    lex_template = NO;
+
+    for (;;) {
+	switch (ch = getc(fp)) {
+	case EOF:
+	case ' ':
+	case '\t':
+	case '\r':
+	case '\n':
+	case ':':
+	case ',':
+	case '(':
+	case ')':
+	case '@':
+	    if (lex_cnt > 0) {
+		if (ch != EOF)
+		    ungetc(ch, fp);
+		if (lex_template)
+		    return LEX_TMPL_STR;
+		else
+		    return LEX_ALPH_STR;
+	    } else
+		switch (ch) {
+		case EOF:
+		    return LEX_EOF;
+		case '\n':
+		    HTlex_line++;
+		    return LEX_REC_SEP;
+		case ':':
+		    return LEX_FIELD_SEP;
+		case ',':
+		    return LEX_ITEM_SEP;
+		case '(':
+		    return LEX_OPEN_PAREN;
+		case ')':
+		    return LEX_CLOSE_PAREN;
+		case '@':
+		    return LEX_AT_SIGN;
+		default:	/* Leading white space ignored (SP,TAB,CR) */
+		    break;
+		}
+	    break;
+	default:
+	    if (lex_cnt < (int) (sizeof(HTlex_buffer) - 1))
+		HTlex_buffer[lex_cnt++] = (char) ch;
+	    HTlex_buffer[lex_cnt] = '\0';
+	    if ('*' == ch)
+		lex_template = YES;
+	}			/* switch ch */
+    }				/* forever */
+}
+
+const char *lex_verbose(LexItem lex_item)
+{
+    static char msg[sizeof(HTlex_buffer) + 30];		/* @@@@@@@@ */
+
+    switch (lex_item) {
+    case LEX_NONE:		/* Internally used      */
+	return "NO-LEX-ITEM";
+    case LEX_EOF:		/* End of file          */
+	return "end-of-file";
+    case LEX_REC_SEP:		/* Record separator     */
+	return "record separator (newline)";
+    case LEX_FIELD_SEP:	/* Field separator      */
+	return "field separator ':'";
+    case LEX_ITEM_SEP:		/* List item separator  */
+	return "item separator ','";
+    case LEX_OPEN_PAREN:	/* Group start tag      */
+	return "'('";
+    case LEX_CLOSE_PAREN:	/* Group end tag        */
+	return "')'";
+    case LEX_AT_SIGN:		/* Address qualifier    */
+	return "address qualifier '@'";
+    case LEX_ALPH_STR:		/* Alphanumeric string  */
+	sprintf(msg, "alphanumeric string '%.*s'",
+		(int) sizeof(HTlex_buffer), HTlex_buffer);
+	return msg;
+    case LEX_TMPL_STR:		/* Template string      */
+	sprintf(msg, "template string '%.*s'",
+		(int) sizeof(HTlex_buffer), HTlex_buffer);
+	return msg;
+    default:
+	return "UNKNOWN-LEX-ITEM";
+    }
+}