scheme.js (13437B)
1 // CodeMirror, copyright (c) by Marijn Haverbeke and others 2 // Distributed under an MIT license: http://codemirror.net/LICENSE 3 4 /** 5 * Author: Koh Zi Han, based on implementation by Koh Zi Chun 6 */ 7 8 (function(mod) { 9 if (typeof exports == "object" && typeof module == "object") // CommonJS 10 mod(require("../../lib/codemirror")); 11 else if (typeof define == "function" && define.amd) // AMD 12 define(["../../lib/codemirror"], mod); 13 else // Plain browser env 14 mod(CodeMirror); 15 })(function(CodeMirror) { 16 "use strict"; 17 18 CodeMirror.defineMode("scheme", function () { 19 var BUILTIN = "builtin", COMMENT = "comment", STRING = "string", 20 ATOM = "atom", NUMBER = "number", BRACKET = "bracket"; 21 var INDENT_WORD_SKIP = 2; 22 23 function makeKeywords(str) { 24 var obj = {}, words = str.split(" "); 25 for (var i = 0; i < words.length; ++i) obj[words[i]] = true; 26 return obj; 27 } 28 29 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?"); 30 var indentKeys = makeKeywords("define let letrec let* lambda"); 31 32 function stateStack(indent, type, prev) { // represents a state stack object 33 this.indent = indent; 34 this.type = type; 35 this.prev = prev; 36 } 37 38 function pushStack(state, indent, type) { 39 state.indentStack = new stateStack(indent, type, state.indentStack); 40 } 41 42 function popStack(state) { 43 state.indentStack = state.indentStack.prev; 44 } 45 46 var binaryMatcher = new RegExp(/^(?:[-+]i|[-+][01]+#*(?:\/[01]+#*)?i|[-+]?[01]+#*(?:\/[01]+#*)?@[-+]?[01]+#*(?:\/[01]+#*)?|[-+]?[01]+#*(?:\/[01]+#*)?[-+](?:[01]+#*(?:\/[01]+#*)?)?i|[-+]?[01]+#*(?:\/[01]+#*)?)(?=[()\s;"]|$)/i); 47 var octalMatcher = new RegExp(/^(?:[-+]i|[-+][0-7]+#*(?:\/[0-7]+#*)?i|[-+]?[0-7]+#*(?:\/[0-7]+#*)?@[-+]?[0-7]+#*(?:\/[0-7]+#*)?|[-+]?[0-7]+#*(?:\/[0-7]+#*)?[-+](?:[0-7]+#*(?:\/[0-7]+#*)?)?i|[-+]?[0-7]+#*(?:\/[0-7]+#*)?)(?=[()\s;"]|$)/i); 48 var hexMatcher = new RegExp(/^(?:[-+]i|[-+][\da-f]+#*(?:\/[\da-f]+#*)?i|[-+]?[\da-f]+#*(?:\/[\da-f]+#*)?@[-+]?[\da-f]+#*(?:\/[\da-f]+#*)?|[-+]?[\da-f]+#*(?:\/[\da-f]+#*)?[-+](?:[\da-f]+#*(?:\/[\da-f]+#*)?)?i|[-+]?[\da-f]+#*(?:\/[\da-f]+#*)?)(?=[()\s;"]|$)/i); 49 var decimalMatcher = new RegExp(/^(?:[-+]i|[-+](?:(?:(?:\d+#+\.?#*|\d+\.\d*#*|\.\d+#*|\d+)(?:[esfdl][-+]?\d+)?)|\d+#*\/\d+#*)i|[-+]?(?:(?:(?:\d+#+\.?#*|\d+\.\d*#*|\.\d+#*|\d+)(?:[esfdl][-+]?\d+)?)|\d+#*\/\d+#*)@[-+]?(?:(?:(?:\d+#+\.?#*|\d+\.\d*#*|\.\d+#*|\d+)(?:[esfdl][-+]?\d+)?)|\d+#*\/\d+#*)|[-+]?(?:(?:(?:\d+#+\.?#*|\d+\.\d*#*|\.\d+#*|\d+)(?:[esfdl][-+]?\d+)?)|\d+#*\/\d+#*)[-+](?:(?:(?:\d+#+\.?#*|\d+\.\d*#*|\.\d+#*|\d+)(?:[esfdl][-+]?\d+)?)|\d+#*\/\d+#*)?i|(?:(?:(?:\d+#+\.?#*|\d+\.\d*#*|\.\d+#*|\d+)(?:[esfdl][-+]?\d+)?)|\d+#*\/\d+#*))(?=[()\s;"]|$)/i); 50 51 function isBinaryNumber (stream) { 52 return stream.match(binaryMatcher); 53 } 54 55 function isOctalNumber (stream) { 56 return stream.match(octalMatcher); 57 } 58 59 function isDecimalNumber (stream, backup) { 60 if (backup === true) { 61 stream.backUp(1); 62 } 63 return stream.match(decimalMatcher); 64 } 65 66 function isHexNumber (stream) { 67 return stream.match(hexMatcher); 68 } 69 70 return { 71 startState: function () { 72 return { 73 indentStack: null, 74 indentation: 0, 75 mode: false, 76 sExprComment: false 77 }; 78 }, 79 80 token: function (stream, state) { 81 if (state.indentStack == null && stream.sol()) { 82 // update indentation, but only if indentStack is empty 83 state.indentation = stream.indentation(); 84 } 85 86 // skip spaces 87 if (stream.eatSpace()) { 88 return null; 89 } 90 var returnType = null; 91 92 switch(state.mode){ 93 case "string": // multi-line string parsing mode 94 var next, escaped = false; 95 while ((next = stream.next()) != null) { 96 if (next == "\"" && !escaped) { 97 98 state.mode = false; 99 break; 100 } 101 escaped = !escaped && next == "\\"; 102 } 103 returnType = STRING; // continue on in scheme-string mode 104 break; 105 case "comment": // comment parsing mode 106 var next, maybeEnd = false; 107 while ((next = stream.next()) != null) { 108 if (next == "#" && maybeEnd) { 109 110 state.mode = false; 111 break; 112 } 113 maybeEnd = (next == "|"); 114 } 115 returnType = COMMENT; 116 break; 117 case "s-expr-comment": // s-expr commenting mode 118 state.mode = false; 119 if(stream.peek() == "(" || stream.peek() == "["){ 120 // actually start scheme s-expr commenting mode 121 state.sExprComment = 0; 122 }else{ 123 // if not we just comment the entire of the next token 124 stream.eatWhile(/[^/s]/); // eat non spaces 125 returnType = COMMENT; 126 break; 127 } 128 default: // default parsing mode 129 var ch = stream.next(); 130 131 if (ch == "\"") { 132 state.mode = "string"; 133 returnType = STRING; 134 135 } else if (ch == "'") { 136 returnType = ATOM; 137 } else if (ch == '#') { 138 if (stream.eat("|")) { // Multi-line comment 139 state.mode = "comment"; // toggle to comment mode 140 returnType = COMMENT; 141 } else if (stream.eat(/[tf]/i)) { // #t/#f (atom) 142 returnType = ATOM; 143 } else if (stream.eat(';')) { // S-Expr comment 144 state.mode = "s-expr-comment"; 145 returnType = COMMENT; 146 } else { 147 var numTest = null, hasExactness = false, hasRadix = true; 148 if (stream.eat(/[ei]/i)) { 149 hasExactness = true; 150 } else { 151 stream.backUp(1); // must be radix specifier 152 } 153 if (stream.match(/^#b/i)) { 154 numTest = isBinaryNumber; 155 } else if (stream.match(/^#o/i)) { 156 numTest = isOctalNumber; 157 } else if (stream.match(/^#x/i)) { 158 numTest = isHexNumber; 159 } else if (stream.match(/^#d/i)) { 160 numTest = isDecimalNumber; 161 } else if (stream.match(/^[-+0-9.]/, false)) { 162 hasRadix = false; 163 numTest = isDecimalNumber; 164 // re-consume the intial # if all matches failed 165 } else if (!hasExactness) { 166 stream.eat('#'); 167 } 168 if (numTest != null) { 169 if (hasRadix && !hasExactness) { 170 // consume optional exactness after radix 171 stream.match(/^#[ei]/i); 172 } 173 if (numTest(stream)) 174 returnType = NUMBER; 175 } 176 } 177 } else if (/^[-+0-9.]/.test(ch) && isDecimalNumber(stream, true)) { // match non-prefixed number, must be decimal 178 returnType = NUMBER; 179 } else if (ch == ";") { // comment 180 stream.skipToEnd(); // rest of the line is a comment 181 returnType = COMMENT; 182 } else if (ch == "(" || ch == "[") { 183 var keyWord = ''; var indentTemp = stream.column(), letter; 184 /** 185 Either 186 (indent-word .. 187 (non-indent-word .. 188 (;something else, bracket, etc. 189 */ 190 191 while ((letter = stream.eat(/[^\s\(\[\;\)\]]/)) != null) { 192 keyWord += letter; 193 } 194 195 if (keyWord.length > 0 && indentKeys.propertyIsEnumerable(keyWord)) { // indent-word 196 197 pushStack(state, indentTemp + INDENT_WORD_SKIP, ch); 198 } else { // non-indent word 199 // we continue eating the spaces 200 stream.eatSpace(); 201 if (stream.eol() || stream.peek() == ";") { 202 // nothing significant after 203 // we restart indentation 1 space after 204 pushStack(state, indentTemp + 1, ch); 205 } else { 206 pushStack(state, indentTemp + stream.current().length, ch); // else we match 207 } 208 } 209 stream.backUp(stream.current().length - 1); // undo all the eating 210 211 if(typeof state.sExprComment == "number") state.sExprComment++; 212 213 returnType = BRACKET; 214 } else if (ch == ")" || ch == "]") { 215 returnType = BRACKET; 216 if (state.indentStack != null && state.indentStack.type == (ch == ")" ? "(" : "[")) { 217 popStack(state); 218 219 if(typeof state.sExprComment == "number"){ 220 if(--state.sExprComment == 0){ 221 returnType = COMMENT; // final closing bracket 222 state.sExprComment = false; // turn off s-expr commenting mode 223 } 224 } 225 } 226 } else { 227 stream.eatWhile(/[\w_\-!$%&*+\.\/:<=>?@\^~]/); 228 229 if (keywords && keywords.propertyIsEnumerable(stream.current())) { 230 returnType = BUILTIN; 231 } else returnType = "variable"; 232 } 233 } 234 return (typeof state.sExprComment == "number") ? COMMENT : returnType; 235 }, 236 237 indent: function (state) { 238 if (state.indentStack == null) return state.indentation; 239 return state.indentStack.indent; 240 }, 241 242 closeBrackets: {pairs: "()[]{}\"\""}, 243 lineComment: ";;" 244 }; 245 }); 246 247 CodeMirror.defineMIME("text/x-scheme", "scheme"); 248 249 });