func setupConstantExps() {
standardFuncs["ln"] = pcalc.NaturalLogarithmOfExpression(pcalc.NewExpressionWithUnknown("a"))
standardFuncs["lg"] = pcalc.DecimalLogarithmOfExpression(pcalc.NewExpressionWithUnknown("a"))
chemicalConstants["R"] = pcalc.NewExpressionWithConstant(pcalc.MakeSDFloat(8.3144, 5))
chemicalConstants["r"] = chemicalConstants["R"]
chemicalConstants["F"] = pcalc.NewExpressionWithConstant(pcalc.MakeSDFloat(96485.33, 7))
chemicalConstants["f"] = chemicalConstants["F"]
physicalConstants["C"] = pcalc.NewExpressionWithConstant(pcalc.MakeSDFloat(299792458, 9))
physicalConstants["c"] = physicalConstants["C"]
physicalConstants["G"] = pcalc.NewExpressionWithConstant(pcalc.MakeSDFloat(9.80665, 6))
physicalConstants["g"] = physicalConstants["G"]
mathematicalConstants["pi"] = pcalc.NewExpressionWithConstant(pcalc.MakeSDFloat(math.Pi, 15))
mathematicalConstants["e"] = pcalc.NewExpressionWithConstant(pcalc.MakeSDFloat(math.E, 15))
}
func parseUnknownExpressions(s string, starti int) []pElement {
nextParseFunction := parseFloatExpressions
ret := make([]pElement, 0)
ind := unknownRE.FindStringIndex(s)
if len(ind) == 0 {
ret = nextParseFunction(s, starti)
} else {
if ind[0] > 0 {
ret = append(ret, nextParseFunction(s[:ind[0]], starti)...)
}
if ind[0] < ind[1] {
var exp *pcalc.Expression
exp = pcalc.NewExpressionWithUnknown(s[ind[0]:ind[1]])
ne := pElement{exp, [2]int{starti + ind[0], starti + ind[1]}}
ret = append(ret, ne)
}
if ind[1] < len(s) {
ret = append(ret, parseUnknownExpressions(s[ind[1]:], starti+ind[1])...)
}
}
return ret
}