[READ-ONLY] Mirror of https://github.com/probablykasper/limp. Programming language made in JS, for fun (unfinished)
limp.kasper.space
language
+Assignment parsing
+35
-13
+3
README.md
+3
README.md
+31
-12
js/limp.js
+31
-12
js/limp.js
···
1
+
// First readNext() goes through the script, performing character/type checks;
2
+
// For instance, isDigit(). After finding out the type, we read the type;
3
+
// readNumber(). readNumber() returns an object with info such as type and
4
+
// value. These objects are put into the statements array, which is later
5
+
// processed by the parser. The parser loops through the statements array,
6
+
// forming the AST, a tree/network object representing the script.
7
+
8
+
1
9
"use strict";
2
10
3
11
function limpLog(type, msg) {
···
16
24
// console.log("[limp] "+msg);
17
25
}
18
26
}
19
-
27
+
var temp = [];
20
28
function limp(input) {
21
29
var pos = 0, line = 1, col = 1; // statement
22
30
···
121
129
// if (currentChar() == "+" && currentChar(1) == "+") operator = "++", jumpChar();
122
130
// if (currentChar() == "-" && currentChar(1) == "-") operator = "--", jumpChar();
123
131
if ("+-*/%".indexOf(operator) >= 0) {
124
-
var subType = "arithmetic"
132
+
var type = "arithmetic"
125
133
} else if ("=".indexOf(operator) >= 0) {
126
-
var subType = "assignment";
134
+
var type = "assignment";
127
135
}
128
-
return {type: "operator", value: operator, subType: subType};
136
+
return {type: type, operator: operator};
129
137
}
130
138
function readKeyword() {
131
139
var keepRunning = true, keyword = currentChar();
···
225
233
226
234
227
235
var ast = statements;
228
-
// loop through statements & tokens
229
-
for (var si = 0; si < ast.length; si++) { // statement index
230
-
for (var ti = 0; ti < ast[si].length; ti++) { // token index
231
-
var token = ast[si][ti];
232
-
if (token.type == "operator") {
233
-
token.left = ast[si][ti-1];
234
-
token.right = ast[si][ti+1];
235
-
ast[si].splice(ti-1, 3, token);
236
+
function parseTokensArray(tokens) {
237
+
for (var ti = 0; ti < tokens.length; ti++) {
238
+
var token = tokens[ti];
239
+
if (token.type == "arithmetic") {
240
+
token.left = tokens[ti-1];
241
+
token.right = tokens[ti+1];
242
+
tokens.splice(ti-1, 3, token);
243
+
ti--;
244
+
} else if (token.type == "assignment") {
245
+
token.left = tokens[ti-1];
246
+
token.right = ast[si].splice(ti+1);
247
+
parseTokensArray(token.right);
248
+
token.right = token.right[0];
249
+
tokens.splice(ti-1, 3, token);
236
250
ti--;
237
251
}
238
252
}
239
253
}
254
+
// loop through statements & tokens
255
+
for (var si = 0; si < ast.length; si++) { // statement index
256
+
parseTokensArray(ast[si]);
257
+
}
240
258
limpLog("inf", ast);
259
+
temp = ast;
241
260
}
242
261
}