Faster market data parsing

yahoo_market.go

@@ -13,7 +13,7 @@ import (
 	`strings`
 )
 
-const marketURL = `http://finance.yahoo.com/` // `http://finance.yahoo.com/marketupdate/overview`
+const marketURL = `http://finance.yahoo.com`
 
 // Market stores current market information displayed in the top three lines of
 // the screen. The market data is fetched and parsed from the HTML page above.
@@ -55,7 +55,7 @@ func (market *Market) Initialize() *Market {
 	rules := []string{
 		`S&P 500</span>`,    any, price, color, price, any, percent, any,
 		`Dow</span>`,        any, price, color, price, any, percent, any,
-		`NASDAQ</span>`,     any, price, color, price, any, percent, any,
+		`Nasdaq</span>`,     any, price, color, price, any, percent, any,
 		`FTSE</span>`,       any, price, color, price, any, percent, any,
 		`DAX</span>`,        any, price, color, price, any, percent, any,
 		`CAC 40</span>`,     any, price, color, price, any, percent, any,
@@ -122,116 +122,116 @@ func (market *Market) trim(body []byte) []byte {
 
 //-----------------------------------------------------------------------------
 func (market *Market) extract(snippet []byte) *Market {
-	matches := market.regex.FindAllStringSubmatch(string(snippet), -1)
-	//fmt.Printf("\n\n\n%q\n\n\n", matches[0])
-	if len(matches) < 1 || len(matches[0]) < 37 {
+	matches := market.regex.FindStringSubmatch(string(snippet))
+        // fmt.Printf("\n\n\n%q\n\n\n", matches)
+        if len(matches) < 37 {
                 panic(`Unable to parse ` + marketURL)
         }
 
 	market.Sp500[`name`] = `S&P 500`
-	market.Sp500[`latest`] = matches[0][1]
-	market.Sp500[`change`] = matches[0][3]
-	market.Sp500[`percent`] = matches[0][4]
-	if matches[0][2] == `green` {
+	market.Sp500[`latest`] = matches[1]
+	market.Sp500[`change`] = matches[3]
+	market.Sp500[`percent`] = matches[4]
+	if matches[2] == `green` {
 		market.Sp500[`change`] = `+` + market.Sp500[`change`]
 		market.Sp500[`percent`] = `+` + market.Sp500[`percent`]
-	} else if matches[0][2] == `red` {
+	} else if matches[2] == `red` {
 		market.Sp500[`change`] = `-` + market.Sp500[`change`]
 		market.Sp500[`percent`] = `-` + market.Sp500[`percent`]
 	}
 
 	market.Dow[`name`] = `Dow`
-	market.Dow[`latest`] = matches[0][5]
-	market.Dow[`change`] = matches[0][7]
-	market.Dow[`percent`] = matches[0][8]
-	if matches[0][6] == `green` {
+	market.Dow[`latest`] = matches[5]
+	market.Dow[`change`] = matches[7]
+	market.Dow[`percent`] = matches[8]
+	if matches[6] == `green` {
 		market.Dow[`change`] = `+` + market.Dow[`change`]
 		market.Dow[`percent`] = `+` + market.Dow[`percent`]
-	} else if matches[0][6] == `red` {
+	} else if matches[6] == `red` {
 		market.Dow[`change`] = `-` + market.Dow[`change`]
 		market.Dow[`percent`] = `-` + market.Dow[`percent`]
 	}
 
 	market.Nasdaq[`name`] = `NASDAQ`
-	market.Nasdaq[`latest`] = matches[0][9]
-	market.Nasdaq[`change`] = matches[0][11]
-	market.Nasdaq[`percent`] = matches[0][12]
-	if matches[0][10] == `green` {
+	market.Nasdaq[`latest`] = matches[9]
+	market.Nasdaq[`change`] = matches[11]
+	market.Nasdaq[`percent`] = matches[12]
+	if matches[10] == `green` {
 		market.Nasdaq[`change`] = `+` + market.Nasdaq[`change`]
 		market.Nasdaq[`percent`] = `+` + market.Nasdaq[`percent`]
-	} else if matches[0][10] == `red` {
+	} else if matches[10] == `red` {
 		market.Nasdaq[`change`] = `-` + market.Nasdaq[`change`]
 		market.Nasdaq[`percent`] = `-` + market.Nasdaq[`percent`]
 	}
 
 	market.London[`name`] = `London`
-	market.London[`latest`] = matches[0][13]
-	market.London[`change`] = matches[0][15]
-	market.London[`percent`] = matches[0][16]
-	if matches[0][14] == `green` {
+	market.London[`latest`] = matches[13]
+	market.London[`change`] = matches[15]
+	market.London[`percent`] = matches[16]
+	if matches[14] == `green` {
 		market.London[`change`] = `+` + market.London[`change`]
 		market.London[`percent`] = `+` + market.London[`percent`]
-	} else if matches[0][14] == `red` {
+	} else if matches[14] == `red` {
 		market.London[`change`] = `-` + market.London[`change`]
 		market.London[`percent`] = `-` + market.London[`percent`]
 	}
 
 	market.Frankfurt[`name`] = `Frankfurt`
-	market.Frankfurt[`latest`] = matches[0][17]
-	market.Frankfurt[`change`] = matches[0][19]
-	market.Frankfurt[`percent`] = matches[0][20]
-	if matches[0][18] == `green` {
+	market.Frankfurt[`latest`] = matches[17]
+	market.Frankfurt[`change`] = matches[19]
+	market.Frankfurt[`percent`] = matches[20]
+	if matches[18] == `green` {
 		market.Frankfurt[`change`] = `+` + market.Frankfurt[`change`]
 		market.Frankfurt[`percent`] = `+` + market.Frankfurt[`percent`]
-	} else if matches[0][18] == `red` {
+	} else if matches[18] == `red` {
 		market.Frankfurt[`change`] = `-` + market.Frankfurt[`change`]
 		market.Frankfurt[`percent`] = `-` + market.Frankfurt[`percent`]
 	}
 
 	market.Paris[`name`] = `Paris`
-	market.Paris[`latest`] = matches[0][21]
-	market.Paris[`change`] = matches[0][23]
-	market.Paris[`percent`] = matches[0][24]
-	if matches[0][22] == `green` {
+	market.Paris[`latest`] = matches[21]
+	market.Paris[`change`] = matches[23]
+	market.Paris[`percent`] = matches[24]
+	if matches[22] == `green` {
 		market.Paris[`change`] = `+` + market.Paris[`change`]
 		market.Paris[`percent`] = `+` + market.Paris[`percent`]
-	} else if matches[0][22] == `red` {
+	} else if matches[22] == `red` {
 		market.Paris[`change`] = `-` + market.Paris[`change`]
 		market.Paris[`percent`] = `-` + market.Paris[`percent`]
 	}
 
 	market.Tokyo[`name`] = `Tokyo`
-	market.Tokyo[`latest`] = matches[0][25]
-	market.Tokyo[`change`] = matches[0][27]
-	market.Tokyo[`percent`] = matches[0][28]
-	if matches[0][26] == `green` {
+	market.Tokyo[`latest`] = matches[25]
+	market.Tokyo[`change`] = matches[27]
+	market.Tokyo[`percent`] = matches[28]
+	if matches[26] == `green` {
 		market.Tokyo[`change`] = `+` + market.Tokyo[`change`]
 		market.Tokyo[`percent`] = `+` + market.Tokyo[`percent`]
-	} else if matches[0][26] == `red` {
+	} else if matches[26] == `red` {
 		market.Tokyo[`change`] = `-` + market.Tokyo[`change`]
 		market.Tokyo[`percent`] = `-` + market.Tokyo[`percent`]
 	}
 
 	market.HongKong[`name`] = `Hong Kong`
-	market.HongKong[`latest`] = matches[0][29]
-	market.HongKong[`change`] = matches[0][31]
-	market.HongKong[`percent`] = matches[0][32]
-	if matches[0][30] == `green` {
+	market.HongKong[`latest`] = matches[29]
+	market.HongKong[`change`] = matches[31]
+	market.HongKong[`percent`] = matches[32]
+	if matches[30] == `green` {
 		market.HongKong[`change`] = `+` + market.HongKong[`change`]
 		market.HongKong[`percent`] = `+` + market.HongKong[`percent`]
-	} else if matches[0][30] == `red` {
+	} else if matches[30] == `red` {
 		market.HongKong[`change`] = `-` + market.HongKong[`change`]
 		market.HongKong[`percent`] = `-` + market.HongKong[`percent`]
 	}
 
 	market.Shanghai[`name`] = `Shanghai`
-	market.Shanghai[`latest`] = matches[0][33]
-	market.Shanghai[`change`] = matches[0][35]
-	market.Shanghai[`percent`] = matches[0][36]
-	if matches[0][34] == `green` {
+	market.Shanghai[`latest`] = matches[33]
+	market.Shanghai[`change`] = matches[35]
+	market.Shanghai[`percent`] = matches[36]
+	if matches[34] == `green` {
 		market.Shanghai[`change`] = `+` + market.Shanghai[`change`]
 		market.Shanghai[`percent`] = `+` + market.Shanghai[`percent`]
-	} else if matches[0][34] == `red` {
+	} else if matches[34] == `red` {
 		market.Shanghai[`change`] = `-` + market.Shanghai[`change`]
 		market.Shanghai[`percent`] = `-` + market.Shanghai[`percent`]
 	}