Adding new functions for autocomplete, and disabling the ones not implemented in expr-eval.

LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/expr-eval.js

@@ -1627,10 +1627,10 @@ function min(array) {
 
 function arrayMap(f, a) {
   if (typeof f !== 'function') {
-    throw new Error(qsTranslate('error', 'First argument to map is not a function.'));
+    throw new EvalError(qsTranslate('error', 'First argument to map is not a function.'));
   }
   if (!Array.isArray(a)) {
-    throw new Error(qsTranslate('error', 'Second argument to map is not an array.'));
+    throw new EvalError(qsTranslate('error', 'Second argument to map is not an array.'));
   }
   return a.map(function (x, i) {
     return f(x, i);
@@ -1639,10 +1639,10 @@ function arrayMap(f, a) {
 
 function arrayFold(f, init, a) {
   if (typeof f !== 'function') {
-    throw new Error(qsTranslate('error', 'First argument to fold is not a function.'));
+    throw new EvalError(qsTranslate('error', 'First argument to fold is not a function.'));
   }
   if (!Array.isArray(a)) {
-    throw new Error(qsTranslate('error', 'Second argument to fold is not an array.'));
+    throw new EvalError(qsTranslate('error', 'Second argument to fold is not an array.'));
   }
   return a.reduce(function (acc, x, i) {
     return f(acc, x, i);
@@ -1651,10 +1651,10 @@ function arrayFold(f, init, a) {
 
 function arrayFilter(f, a) {
   if (typeof f !== 'function') {
-    throw new Error(qsTranslate('error', 'First argument to filter is not a function.'));
+    throw new EvalError(qsTranslate('error', 'First argument to filter is not a function.'));
   }
   if (!Array.isArray(a)) {
-    throw new Error(qsTranslate('error', 'Second argument to filter is not an array.'));
+    throw new EvalError(qsTranslate('error', 'Second argument to filter is not an array.'));
   }
   return a.filter(function (x, i) {
     return f(x, i);
@@ -1773,6 +1773,7 @@ class Parser {
       atan2: Math.atan2,
       'if': condition,
       gamma: gamma,
+      'Γ': gamma,
       roundTo: roundTo,
       map: arrayMap,
       fold: arrayFold,

LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/objs/gainbode.js

@@ -112,7 +112,7 @@ class GainBode extends Common.ExecutableObject {
     
     draw(canvas, ctx) {
         var base = [canvas.x2px(this.om_0.x), canvas.y2px(this.om_0.y)]
-        var dbfn = new MathLib.Expression(`${this.gain.execute()}*(ln(x)-ln(${this.om_0.x}))/ln(10)+${this.om_0.y}`)
+        var dbfn = new MathLib.Expression(`${this.gain.execute()}*(log10(x)-log10(${this.om_0.x}))+${this.om_0.y}`)
         var inDrawDom = new MathLib.EmptySet()
 
         if(this.pass == 'high') {

LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/parsing/polyfill.js

@@ -0,0 +1,136 @@
+/**
+ *  LogarithmPlotter - 2D plotter software to make BODE plots, sequences and distribution functions.
+ *  Copyright (C) 2022  Ad5001
+ * 
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ * 
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ * 
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+// Contains polyfill math functions used for reference.
+
+.pragma library
+
+function factorial(x) {
+    if (x < 0) // Integrating by less than 0
+        if(isFinite(n))
+            return Infinity
+        else
+            throw new EvalError("Cannot calculate the factorial of -∞.")
+    
+    return gamma(x+1)
+}
+
+let GAMMA_G = 4.7421875
+let GAMMA_P = [
+    0.99999999999999709182,
+    57.156235665862923517, -59.597960355475491248,
+    14.136097974741747174, -0.49191381609762019978,
+    0.33994649984811888699e-4,
+    0.46523628927048575665e-4, -0.98374475304879564677e-4,
+    0.15808870322491248884e-3, -0.21026444172410488319e-3,
+    0.21743961811521264320e-3, -0.16431810653676389022e-3,
+    0.84418223983852743293e-4, -0.26190838401581408670e-4,
+    0.36899182659531622704e-5
+]
+
+function gamma(n) {
+    if(n <= 0) // Integrating by less than 0
+        if(isFinite(n))
+            return Infinity
+        else
+            throw new EvalError("Cannot calculate Γ(-∞).")
+
+    if(n >= 171.35)
+        return Infinity // Would return more than 2^1024 - 1 (aka Number.INT_MAX)
+    
+    if(n === Math.round(n) && isFinite(n)) {
+        // Calculating (n-1)!
+        let res = n - 1
+        
+        for(let i = n - 2; i > 1; i++)
+            res *= i
+
+        if(res === 0)
+            res = 1 // 0! is per definition 1
+
+        return res
+    }
+
+    // Section below adapted function adapted from math.js
+    if(n < 0.5)
+        return Math.PI / (Math.sin(Math.PI * n) * gamma(1 - n))
+
+    if(n > 85.0) { // Extended Stirling Approx
+        let twoN = n * n
+        let threeN = twoN * n
+        let fourN = threeN * n
+        let fiveN = fourN * n
+        return Math.sqrt(2 * Math.PI / n) * Math.pow((n / Math.E), n) *
+        (1 + (1 / (12 * n)) + (1 / (288 * twoN)) - (139 / (51840 * threeN)) -
+        (571 / (2488320 * fourN)) + (163879 / (209018880 * fiveN)) +
+        (5246819 / (75246796800 * fiveN * n)))
+    }
+
+    --n
+    let x = GAMMA_P[0]
+    for (let i = 1 i < GAMMA_P.length ++i) {
+        x += GAMMA_P[i] / (n + i)
+    }
+
+    let t = n + GAMMA_G + 0.5
+    return Math.sqrt(2 * Math.PI) * Math.pow(t, n + 0.5) * Math.exp(-t) * x
+}
+
+function arrayMap(f, arr) {
+    if (typeof f != 'function')
+        throw new EvalError(qsTranslate('error', 'First argument to map is not a function.'))
+    if (!Array.isArray(arr))
+        throw new EvalError(qsTranslate('error', 'Second argument to map is not an array.'))
+    return arr.map(f)
+}
+
+function arrayFold(f, init, arr) {
+    if (typeof f != 'function')
+        throw new EvalError(qsTranslate('error', 'First argument to fold is not a function.'))
+    if (!Array.isArray(arr))
+        throw new EvalError(qsTranslate('error', 'Second argument to fold is not an array.'))
+    return arr.reduce(f, init)
+}
+
+function arrayFilter(f, arr) {
+    if (typeof f != 'function')
+        throw new EvalError(qsTranslate('error', 'First argument to filter is not a function.'))
+    if (!Array.isArray(arr))
+        throw new EvalError(qsTranslate('error', 'Second argument to filter is not an array.'))
+    return arr.filter(f)
+}
+
+function arrayFilter(f, arr) {
+    if (typeof f != 'function')
+        throw new EvalError(qsTranslate('error', 'First argument to filter is not a function.'))
+    if (!Array.isArray(arr))
+        throw new EvalError(qsTranslate('error', 'Second argument to filter is not an array.'))
+    return arr.filter(f)
+}
+
+function arrayJoin(sep, arr) {
+    if (!Array.isArray(arr))
+        throw new Error(qsTranslate('error', 'Second argument to join is not an array.'))
+    return arr.join(sep)
+}
+
+function indexOf(target, s) {
+    if (!(Array.isArray(s) || typeof s === 'string'))
+        throw new Error(qsTranslate('error', 'Second argument to indexOf is not a string or array.'))
+    return s.indexOf(target)
+}

LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/parsing/reference.js

@@ -18,54 +18,81 @@
 
 .pragma library
 
+.import "polyfill.js" as Polyfill
+
+
 const CONSTANTS = {
     "π": Math.PI,
     "pi": Math.PI,
     "inf": Infinity,
     "infinity": Infinity,
     "∞": Infinity,
-    "e": Infinity
+    "e": Math.E
 };
 const CONSTANTS_LIST = Object.keys(CONSTANTS);
 
 const FUNCTIONS = {
-    "abs": Math.abs,
-    "acos": Math.acos,
-    "acosh": Math.acosh,
-    "asin": Math.asin,
-    "asinh": Math.asinh,
-    "atan": Math.atan,
-    "atan2": Math.atan2,
-    "atanh": Math.atanh,
-    "cbrt": Math.cbrt,
-    "ceil": Math.ceil,
-    "clz32": Math.clz32,
-    "cos": Math.cos,
-    "cosh": Math.cosh,
-    "exp": Math.exp,
-    "expm1": Math.expm1,
-    "floor": Math.floor,
-    "fround": Math.fround,
-    "hypot": Math.hypot,
-    "imul": Math.imul,
-    "log": Math.log,
-    "log10": Math.log10,
-    "log1p": Math.log1p,
-    "log2": Math.log2,
-    "max": Math.max,
-    "min": Math.min,
-    "pow": Math.log2,
-    "random": Math.random,
-    "round": Math.round,
-    "sign": Math.sign,
-    "sin": Math.sin,
-    "sinh": Math.sinh,
-    "sqrt": Math.sqrt,
-    "tan": Math.tan,
-    "tanh": Math.tanh,
-    "trunc": Math.trunc,
-    "integral": () => 0, // TODO: Implement
-    "derivative": () => 0,
+    // The functions commented are the one either not implemented 
+    // in the parser, or not to be used for autocompletion.
+    // Unary operators
+    //'+': Number,
+    //'-': (x) => -x,
+    //'!'
+    // Other operations
+    'length': (s) => Array.isArray(s) ? s.length : String(s).length,
+    // Boolean functions
+    'not': (x) => !x,
+    // Math functions
+    'abs': Math.abs,
+    'acos': Math.acos,
+    'acosh': Math.acosh,
+    'asin': Math.asin,
+    'asinh': Math.asinh,
+    'atan': Math.atan,
+    'atan2': Math.atan2,
+    'atanh': Math.atanh,
+    'cbrt': Math.cbrt,
+    'ceil': Math.ceil,
+    //'clz32': Math.clz32,
+    'cos': Math.cos,
+    'cosh': Math.cosh,
+    'exp': Math.exp,
+    'expm1': Math.expm1,
+    'floor': Math.floor,
+    //'fround': Math.fround,
+    'hypot': Math.hypot,
+    //'imul': Math.imul,
+    'lg': Math.log10,
+    'ln': Math.log,
+    'log': Math.log,
+    'log10': Math.log10,
+    'log1p': Math.log1p,
+    'log2': Math.log2,
+    'max': Math.max,
+    'min': Math.min,
+    'pow': Math.log2,
+    'random': Math.random,
+    'round': Math.round,
+    'sign': Math.sign,
+    'sin': Math.sin,
+    'sinh': Math.sinh,
+    'sqrt': Math.sqrt,
+    'tan': Math.tan,
+    'tanh': Math.tanh,
+    'trunc': Math.trunc,
+    // Functions in expr-eval, ported here.
+    'fac': Polyfill.factorial,
+    'gamma': Polyfill.gamma,
+    'Γ': Polyfill.gamma,
+    'roundTo': (x, exp) => Number(x).toFixed(exp),
+    'map': Polyfill.arrayMap,
+    'fold': Polyfill.arrayFold,
+    'filter': Polyfill.arrayFilter,
+    'indexOf': Polyfill.indexOf,
+    'join': Polyfill.arrayJoin,
+    // Integral & derivative (only here for autocomplete).
+    'integral': () => 0, // TODO: Implement
+    'derivative': () => 0,
 }
 const FUNCTIONS_LIST = Object.keys(FUNCTIONS);
 // TODO: Complete