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/**
* Author: Koh Zi Han, based on implementation by Koh Zi Chun
*/
CodeMirror.defineMode("scheme", function (config, mode) {
var BUILTIN = "builtin", COMMENT = "comment", STRING = "string",
ATOM = "atom", NUMBER = "number", BRACKET = "bracket", KEYWORD="keyword";
var INDENT_WORD_SKIP = 2, KEYWORDS_SKIP = 1;
function makeKeywords(str) {
var obj = {}, words = str.split(" ");
for (var i = 0; i < words.length; ++i) obj[words[i]] = true;
return obj;
}
var keywords = makeKeywords("λ case-lambda call/cc class define-class exit-handler field import inherit init-field interface let*-values let-values let/ec mixin opt-lambda override protect provide public rename require require-for-syntax syntax syntax-case syntax-error unit/sig unless when with-syntax and begin call-with-current-continuation call-with-input-file call-with-output-file case cond define define-syntax delay do dynamic-wind else for-each if lambda let let* let-syntax letrec letrec-syntax map or syntax-rules abs acos angle append apply asin assoc assq assv atan boolean? caar cadr call-with-input-file call-with-output-file call-with-values car cdddar cddddr cdr ceiling char->integer char-alphabetic? char-ci<=? char-ci<? char-ci=? char-ci>=? char-ci>? char-downcase char-lower-case? char-numeric? char-ready? char-upcase char-upper-case? char-whitespace? char<=? char<? char=? char>=? char>? char? close-input-port close-output-port complex? cons cos current-input-port current-output-port denominator display eof-object? eq? equal? eqv? eval even? exact->inexact exact? exp expt #f floor force gcd imag-part inexact->exact inexact? input-port? integer->char integer? interaction-environment lcm length list list->string list->vector list-ref list-tail list? load log magnitude make-polar make-rectangular make-string make-vector max member memq memv min modulo negative? newline not null-environment null? number->string number? numerator odd? open-input-file open-output-file output-port? pair? peek-char port? positive? procedure? quasiquote quote quotient rational? rationalize read read-char real-part real? remainder reverse round scheme-report-environment set! set-car! set-cdr! sin sqrt string string->list string->number string->symbol string-append string-ci<=? string-ci<? string-ci=? string-ci>=? string-ci>? string-copy string-fill! string-length string-ref string-set! string<=? string<? string=? string>=? string>? string? substring symbol->string symbol? #t tan transcript-off transcript-on truncate values vector vector->list vector-fill! vector-length vector-ref vector-set! with-input-from-file with-output-to-file write write-char zero?");
var indentKeys = makeKeywords("define let letrec let* lambda");
function stateStack(indent, type, prev) { // represents a state stack object
this.indent = indent;
this.type = type;
this.prev = prev;
}
function pushStack(state, indent, type) {
state.indentStack = new stateStack(indent, type, state.indentStack);
}
function popStack(state) {
state.indentStack = state.indentStack.prev;
}
/**
* Scheme numbers are complicated unfortunately.
* Checks if we're looking at a number, which might be possibly a fraction.
* Also checks that it is not part of a longer identifier. Returns true/false accordingly.
*/
function isNumber(ch, stream){
if(/[0-9]/.exec(ch) != null){
stream.eatWhile(/[0-9]/);
stream.eat(/\//);
stream.eatWhile(/[0-9]/);
if (stream.eol() || !(/[a-zA-Z\-\_\/]/.exec(stream.peek()))) return true;
stream.backUp(stream.current().length - 1); // undo all the eating
}
return false;
}
return {
startState: function () {
return {
indentStack: null,
indentation: 0,
mode: false,
sExprComment: false
};
},
token: function (stream, state) {
if (state.indentStack == null && stream.sol()) {
// update indentation, but only if indentStack is empty
state.indentation = stream.indentation();
}
// skip spaces
if (stream.eatSpace()) {
return null;
}
var returnType = null;
switch(state.mode){
case "string": // multi-line string parsing mode
var next, escaped = false;
while ((next = stream.next()) != null) {
if (next == "\"" && !escaped) {
state.mode = false;
break;
}
escaped = !escaped && next == "\\";
}
returnType = STRING; // continue on in scheme-string mode
break;
case "comment": // comment parsing mode
var next, maybeEnd = false;
while ((next = stream.next()) != null) {
if (next == "#" && maybeEnd) {
state.mode = false;
break;
}
maybeEnd = (next == "|");
}
returnType = COMMENT;
break;
case "s-expr-comment": // s-expr commenting mode
state.mode = false;
if(stream.peek() == "(" || stream.peek() == "["){
// actually start scheme s-expr commenting mode
state.sExprComment = 0;
}else{
// if not we just comment the entire of the next token
stream.eatWhile(/[^/s]/); // eat non spaces
returnType = COMMENT;
break;
}
default: // default parsing mode
var ch = stream.next();
if (ch == "\"") {
state.mode = "string";
returnType = STRING;
} else if (ch == "'") {
returnType = ATOM;
} else if (ch == '#') {
if (stream.eat("|")) { // Multi-line comment
state.mode = "comment"; // toggle to comment mode
returnType = COMMENT;
} else if (stream.eat(/[tf]/)) { // #t/#f (atom)
returnType = ATOM;
} else if (stream.eat(';')) { // S-Expr comment
state.mode = "s-expr-comment";
returnType = COMMENT;
}
} else if (ch == ";") { // comment
stream.skipToEnd(); // rest of the line is a comment
returnType = COMMENT;
} else if (ch == "-"){
if(!isNaN(parseInt(stream.peek()))){
stream.eatWhile(/[\/0-9]/);
returnType = NUMBER;
}else{
returnType = null;
}
} else if (isNumber(ch,stream)){
returnType = NUMBER;
} else if (ch == "(" || ch == "[") {
var keyWord = ''; var indentTemp = stream.column();
/**
Either
(indent-word ..
(non-indent-word ..
(;something else, bracket, etc.
*/
while ((letter = stream.eat(/[^\s\(\[\;\)\]]/)) != null) {
keyWord += letter;
}
if (keyWord.length > 0 && indentKeys.propertyIsEnumerable(keyWord)) { // indent-word
pushStack(state, indentTemp + INDENT_WORD_SKIP, ch);
} else { // non-indent word
// we continue eating the spaces
stream.eatSpace();
if (stream.eol() || stream.peek() == ";") {
// nothing significant after
// we restart indentation 1 space after
pushStack(state, indentTemp + 1, ch);
} else {
pushStack(state, indentTemp + stream.current().length, ch); // else we match
}
}
stream.backUp(stream.current().length - 1); // undo all the eating
if(typeof state.sExprComment == "number") state.sExprComment++;
returnType = BRACKET;
} else if (ch == ")" || ch == "]") {
returnType = BRACKET;
if (state.indentStack != null && state.indentStack.type == (ch == ")" ? "(" : "[")) {
popStack(state);
if(typeof state.sExprComment == "number"){
if(--state.sExprComment == 0){
returnType = COMMENT; // final closing bracket
state.sExprComment = false; // turn off s-expr commenting mode
}
}
}
} else {
stream.eatWhile(/[\w\$_\-]/);
if (keywords && keywords.propertyIsEnumerable(stream.current())) {
returnType = BUILTIN;
}else returnType = null;
}
}
return (typeof state.sExprComment == "number") ? COMMENT : returnType;
},
indent: function (state, textAfter) {
if (state.indentStack == null) return state.indentation;
return state.indentStack.indent;
}
};
});
CodeMirror.defineMIME("text/x-scheme", "scheme");
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