Press n or j to go to the next uncovered block, b, p or k for the previous block.
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var self = this;
this.token_types = token_types;
this.symbol_table = {};
this.original_symbol = {
nud: function () { throw Error("Undefined"); },
led: function () { throw Error("Missing operator"); }
};
this.mul = function(left){ return ["*", [left, this.nud()]]; };
this.symbol = function (id, bp) {
var s = self.symbol_table[id];
bp = bp || 0;
if (s) {
if (bp >= s.lbp) {
s.lbp = bp;
}
} else {
s = Object.create(self.original_symbol);
s.id = s.value = id;
s.lbp = bp;
s.parent = self;
self.symbol_table[id] = s;
}
return s;
};
this.advance = function (id) {
var a, o, t, v;
Iif (id && this.token.id !== id) {
throw Error("Expected '" + id + "'");
}
if (self.token_nr >= self.tokens.length) {
self.token = this.symbol_table["(end)"];
return;
}
t = self.tokens[self.token_nr];
self.token_nr += 1;
v = t.value;
var args = null;
a = t.type;
if (a === "name") {
o = this.symbol_table["(var)"];
} else if (a === "operator") {
o = this.symbol_table[v];
Iif (!o) {
throw Error("Unknown operator");
}
} else if (a === "pass") {
a = "pass";
o = this.symbol_table["(pass)"];
args = t.args;
} else if (a === "number") {
a = "literal";
o = this.symbol_table["(literal)"];
} else Eif (a === "function") {
a = "function";
o = this.symbol_table["(function)"];
args = t.args;
} else {
throw Error("Unexpected token",t);
}
self.token = Object.create(o);
self.token.type = a;
self.token.value = v;
if(args) self.token.args = args;
return self.token;
};
this.expression = function (rbp) {
var left;
var t = self.token;
self.advance();
left = t.nud();
while (rbp < self.token.lbp) {
t = self.token;
self.advance();
left = t.led(left);
}
return left;
};
this.infix = function (id, bp, led) {
var s = this.symbol(id, bp);
s.led = led || function (left) {
return [this.value, [left, self.expression(bp)]];
};
return s;
};
this.prefix = function (id, nud) {
var s = self.symbol(id);
s.nud = nud || function () {
Eif(this.value == "-") this.value = "neg";
return [this.value, [self.expression(70)]];
};
return s;
}
this.symbol("(end)");
var s = null;
s = this.symbol("(blank)", 60);
s.nud = function(){ return ["blank"];};
s = this.symbol("(function)", 60);
s.led = this.mul;
s.nud = function(){ return [this.value, this.args || []];};
s = this.symbol("(literal)", 60);
s.led = this.mul;
s.nud = function(){ return ["val", [this.value]] };
s = this.symbol("(pass)", 60);
s.led = this.mul;
s.nud = function(){ return this.args[0] };
s = this.symbol("(var)", 60);
s.led = this.mul;
s.nud = function(){ return ["var", [this.value]] };
this.token_nr = 0;
this.tokens = [];
this.infix("=", 40);
this.infix("!=", 40);
this.infix("<", 40);
this.infix(">", 40);
this.infix("<=", 40);
this.infix(">=", 40);
this.infix("+", 50);
this.infix("-", 50);
this.infix("*", 60);
this.infix("/", 60);
this.infix("!", 70, function(left){ return ["factorial", [left]]; });
this.infix("^", 70, function(left){ return ["exponential", [left, self.expression(70)]]; });
this.infix("_", 70, function(left){ return ["subscript", [left, self.expression(70)]]; });
this.infix("(", 80, self.mul);
this.symbol("(").nud = function(){ var ans = self.expression(0); self.advance(")"); return ans; }
this.symbol(")");
this.symbol("{").nud = function(){ var ans = self.expression(0); self.advance("}"); return ans; }
this.symbol("}");
this.symbol(",");
this.prefix("-");
this.tokenise_and_parse = function(str){
return this.parse(this.tokenise(str));
}
this.parse = function(tokens){
this.tokens = tokens;
this.token_nr = 0;
Iif(this.tokens.length == 0) return ["blank"];
this.advance();
return this.expression(10);
}
}
Parser.prototype.tokenise = function(text){
var ans = [];
while(text.length > 0){
var ok = false;
for(var i = 0; i < this.token_types.length; i++){
var t = this.token_types[i];
var re = RegExp(t.re);
var m = re.exec(text);
if(m){
m = m[0];
text = text.substring(m.length);
ok = true;
Eif(t.type != "space") ans.push({"type":t.type, "value": t.value(m)})
break;
}
}
if(!ok){
Eif(text.charCodeAt(0) > 128){
var c = "";
for(var ch of text){
c = ch;
break;
}
ans.push({"type":"name", "value":c});
text = text.substring(c.length);
}
else{
return [];
}
}
}
return ans;
}
var EParser = new Parser([
{"type":"number", "re":"^[0-9.]+", "value":function(m){
Iif(isNaN(Number(m))) throw Error("Invalid number: "+m);
return Number(m);
}},
{"type":"operator", "re":"^(<=|>=|!=|>|<|=)", "value":function(m){return m}},
{"type":"operator", "re":"^[-+*/!]", "value":function(m){return m}},
{"type":"name", "re":"^[a-zA-Z]", "value":function(m){return m}},
{"type":"space", "re":"^\\s+", "value":function(m){return m}}
]);
var TextParser = new Parser([
{"type":"number", "re":"^[0-9.]+", "value":function(m){
Iif(isNaN(Number(m))) throw Error("Invalid number: "+m);
return Number(m);
}},
{"type":"operator", "re":"^(!=|>=|<=)", "value":function(m){return m;}},
{"type":"operator", "re":"^[-+*/,!()=<>_^]", "value":function(m){return m}},
{"type":"name", "re":"^[a-zA-Z_]*[a-zA-Z]", "value":function(m){return m}},
{"type":"comma", "re":"^,", "value":function(m){return m}},
{"type":"space", "re":"^\\s+", "value":function(m){return m}}
]);
var s = TextParser.symbol("(var)", 60);
s.led = TextParser.mul;
s.nud = function(){
if(this.parent.token.id == "("){
var args = [];
TextParser.advance()
if(this.parent.token.id !== ")"){
while(true){
args.push(TextParser.expression(0));
if (this.parent.token.id !== ",") {
break;
}
TextParser.advance(",");
}
}
TextParser.advance(")");
return [this.value, args];
}
else{
return ["var", [this.value]]
}
};
var LaTeXParser = new Parser([
{"type":"number", "re":"^[0-9.]+", "value":function(m){
Iif(isNaN(Number(m))) throw Error("Invalid number: "+m);
return Number(m);
}},
{"type":"operator", "re":"^(!=|>=|<=)", "value":function(m){return m;}},
{"type":"operator", "re":"^[-+*/,!()=<>_^}{]", "value":function(m){return m}},
{"type":"name", "re":"^[a-zA-Z_]*[a-zA-Z]", "value":function(m){return m}},
{"type":"name", "re":"^\\\\[a-zA-Z]*[a-zA-Z]", "value":function(m){return m.substring(1)}},
{"type":"space", "re":"^\\s+", "value":function(m){return m}}
]);
s = LaTeXParser.symbol("(var)", 60);
s.led = LaTeXParser.mul;
s.nud = function(){
var args = [];
while(this.parent.token.id == "{"){
LaTeXParser.advance()
Eif(this.parent.token.id !== "}"){
args.push(LaTeXParser.expression(0));
LaTeXParser.advance("}");
}
}
if(args.length > 0) return [this.value, args];
else return ["var", [this.value]]
};
export default {"Parser":Parser,
"TextParser":TextParser,
"LaTeXParser":LaTeXParser,
"EParser": EParser};
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