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authorNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
committerNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
commite0c6872cf40896c7be36b11dcc744620f10adf1d (patch)
tree60335e10d2f4354b0674ec22d7b53f0f8abee672 /web/reduce/rweb/rtangle.ch
Initial commit
Diffstat (limited to 'web/reduce/rweb/rtangle.ch')
-rw-r--r--web/reduce/rweb/rtangle.ch135
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diff --git a/web/reduce/rweb/rtangle.ch b/web/reduce/rweb/rtangle.ch
new file mode 100644
index 0000000000..57de6458a6
--- /dev/null
+++ b/web/reduce/rweb/rtangle.ch
@@ -0,0 +1,135 @@
+% Copyright (c) 1991: Marcel Roelofs and Peter Gragert
+% University of Twente, Enschede, The Netherlands
+% @@(#) rtangle.ch (91/03/11)
+
+@x
+@u
+@<Include files@>@;
+@<Common code for \.{WEAVE} and \.{TANGLE}@>@;
+@<Typedef declarations@>@;
+@<Global variables@>@;
+@y
+@u
+#define NEWLINES_IN_MACROS
+@<Include files@>@;
+@<Common code for \.{WEAVE} and \.{TANGLE}@>@;
+@<Typedef declarations@>@;
+@<Global variables@>@;
+@z
+
+@x
+ if (isdigit(c) || c=='\\' || c=='.') @<Get a constant@>@;/*spider*/
+ else if (isalpha(c) || c=='_' || c=='$') @<Get an identifier@>@;/*spider*/
+ else if (c=='\'' || c=='\"') @<Get a string@>@;/*spider*/
+@y
+ if (isdigit(c)) @<Get a constant@>@;/*spider*/
+ else if (isalpha(c) || c=='_' || c=='!') @<Get an identifier@>@;/*spider*/
+ else if (c=='\"') @<Get a string@>@;/*spider*/
+@z
+
+@x
+@ @<Get an identifier@>= {/*spider*/
+ id_first=--loc;
+ while (isalpha(*++loc) || isdigit(*loc) || *loc=='_');
+ if (*loc=='$') while (isdigit(*++loc)||*loc=='$');
+ /* make room for \$\$ and \$nnn suffixes */
+ id_loc=loc; return(identifier);
+}
+@y
+@ @<Get an identifier@>= {/*spider*/
+ id_first=--loc;
+ if (c=='!') ++loc;
+ while (isalpha(*++loc) || isdigit(*loc) || *loc=='_' || *loc=='!')
+ if (*loc=='!') ++loc;
+ id_loc=loc; return(identifier);
+}
+@z
+
+@x
+@ \cee\ strings and character constants, delimited by double and single
+quotes, respectively, can contain newlines or instances of their own
+delimiters if they are protected by a backslash. We follow this
+convention, but do not allow the string to be longer than |longest_name|.
+
+@<Get a string@>= {/*spider*/
+ ASCII delim = c; /* what started the string */
+@#
+/* if it's not a single-character literal, it's a tick mark or an |at_sign| */
+ if (delim=='\'' && (loc+1>=limit ||
+ (*loc != '\\' && *loc!=at_sign && loc[1]!='\'') ||
+ (*loc=='\\' && (loc+2>=limit||loc[2]!='\'')) ||
+ (*loc==at_sign &&
+ (loc+2>=limit||loc[1]!=at_sign||loc[2]!='\''))
+ )) goto mistake;
+ id_first = mod_text+1;
+ id_loc = mod_text; *++id_loc=delim;
+ while (1) {
+ if (loc>=limit) {
+ if(*(limit-1)!='\\') {
+ err_print("! String didn't end"); loc=limit; break;
+@.String didn't end@>
+ }
+ if(get_line()==0) {
+ err_print("! Input ended in middle of string"); loc=buffer; break;
+@.Input ended in middle of string@>
+ }
+ else if (++id_loc<=mod_text_end) *id_loc=@`\n'; /* will print as
+ \.{"\\\\\\n"} */
+ }
+ if ((c=*loc++)==delim) {
+ if (++id_loc<=mod_text_end) *id_loc=c;
+ break;
+ }
+ if (c=='\\') {
+ if (loc>=limit) continue;
+ if (++id_loc<=mod_text_end) *id_loc = '\\';
+ c=*loc++;
+ }
+ if (++id_loc<=mod_text_end) *id_loc=c;
+ }
+ if (id_loc>=mod_text_end) {
+ printf("\n! String too long: ");
+@.String too long@>
+ ASCII_write(mod_text+1,25);
+ printf("..."); mark_error;
+ }
+ id_loc++;
+ return(string);
+}
+@y
+@ \cee\ strings are delimited by double quotes and must be restricted
+to one line. Double quotes in strings must be doubled and we allow no
+string to be longer than |longest_name|.
+
+@<Get a string@>= {/*spider*/
+ ASCII delim = c; /* what started the string */
+@#
+ id_first = mod_text+1;
+ id_loc = mod_text; *++id_loc=delim;
+ while (1) {
+ if (loc>=limit) {
+ err_print("! String didn't end"); loc=limit;
+@.String didn't end@>
+ if (get_line()==0) {
+ err_print("! Input ended in middle of string"); loc=buffer;
+@.Input ended in middle of string@>
+ }
+ break;
+ }
+ if ((c=*loc++)==delim) {
+ if (++id_loc<=mod_text_end) *id_loc=c;
+ if (*loc==delim) loc++;
+ else break;
+ }
+ if (++id_loc<=mod_text_end) *id_loc=c;
+ }
+ if (id_loc>=mod_text_end) {
+ printf("\n! String too long: ");
+@.String too long@>
+ ASCII_write(mod_text+1,25);
+ printf("..."); mark_error;
+ }
+ id_loc++;
+ return(string);
+}
+@z