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Diffstat (limited to 'projects/12/String.jack')
| -rw-r--r-- | projects/12/String.jack | 176 |
1 files changed, 0 insertions, 176 deletions
diff --git a/projects/12/String.jack b/projects/12/String.jack deleted file mode 100644 index 3ef40b2..0000000 --- a/projects/12/String.jack +++ /dev/null @@ -1,176 +0,0 @@ -// This file is part of www.nand2tetris.org
-// and the book "The Elements of Computing Systems"
-// by Nisan and Schocken, MIT Press.
-// File name: projects/12/String.jack
-
-/**
- * Represents character strings. In addition for constructing and disposing
- * strings, the class features methods for getting and setting individual
- * characters of the string, for erasing the string's last character,
- * for appending a character to the string's end, and more typical
- * string-oriented operations.
- */
-class String {
- field int maxLen;
- field int len;
- field Array s;
-
- /** constructs a new empty string with a maximum length of maxLength
- * and initial length of 0. */
- constructor String new(int maxLength) {
- if (maxLength > 0) {
- let s = Array.new(maxLength);
- }
- let maxLen = maxLength;
- let len = 0;
- return this;
- }
-
- /** Disposes this string. */
- method void dispose() {
- if (maxLen > 0) {
- do s.dispose();
- }
- do Memory.deAlloc(this);
- return;
- }
-
- /** Returns the current length of this string. */
- method int length() {
- return len;
- }
-
- /** Returns the character at the j-th location of this string. */
- method char charAt(int j) {
- if ((j < 0) | (j + 1 > len)){
- do Output.printString("String.charAt: index out of range!");
- do Sys.error(5);
- }
- return s[j];
- }
-
- /** Sets the character at the j-th location of this string to c. */
- method void setCharAt(int j, char c) {
- if ((j < 0) | (j + 1 > len)){
- do Output.printString("String.setCharAt: index out of range!");
- do Sys.error(5);
- }
- let s[j] = c;
- return;
- }
-
- /** Appends c to this string's end and returns this string. */
- method String appendChar(char c) {
- if (len = maxLen) {
- do Output.printString("String.appendChar: reached max length!");
- do Sys.error(5);
- }
- let s[len] = c;
- let len = len + 1;
- return this;
- }
-
- /** Erases the last character from this string. */
- method void eraseLastChar() {
- if (len = 0){
- do Output.printString("String.eraseLastChar: string is already empty!");
- do Sys.error(5);
- }
- let len = len - 1;
- return;
- }
-
- /** Returns the integer value of this string,
- * until a non-digit character is detected. */
- method int intValue() {
- var int n, i;
- var char c;
- var boolean neg, done;
- let n = 0;
- if (s[0] = 45) {
- let i = 1;
- let neg = true;
- } else {
- let i = 0;
- let neg = false;
- }
- let c = s[i];
- if ((c < 48) | (c > 57)) {
- do Sys.error(3);
- do Output.printString("String.intValue: the input data is not number!");
- }
- let done = false;
- while ((~done) & (i < len)) {
- let c = s[i];
- if ((c > 47) & (c < 58)) {
- let n = n * 10 + (c - 48);
- } else {
- let done = true;
- }
- let i = i + 1;
- }
- if (neg) {
- return -n;
- } else {
- return n;
- }
-
- }
-
- /** Sets this string to hold a representation of the given value. */
- method void setInt(int val) { //change Output.printInt after this
- var int x, i, y;
- var boolean neg;
- if (val < 0) {
- let neg = true;
- let len = 2;
- } else {
- let neg = false;
- let len = 1;
- }
- let x = Math.abs(val);
- if (x > 9999) {
- let len = len + 4;
- } else { if (x > 999) {
- let len = len + 3;
- } else { if (x > 99) {
- let len = len + 2;
- } else { if (x > 9) {
- let len = len + 1;
- }}}}
- if (len > maxLen) {
- do Output.printString("String.setInt: val is too big for the string!");
- do Sys.error(5);
- }
- if (x = 0) {
- do setCharAt(0, 48);
- return;
- }
- if (neg) {
- do setCharAt(0, 45);
- }
- let i = len - 1;
- while (x > 0) {
- let y = x / 10;
- do setCharAt(i, x - (y * 10) + 48);
- let x = y;
- let i = i - 1;
- }
- return;
- }
-
- /** Returns the new line character. */
- function char newLine() {
- return 128;
- }
-
- /** Returns the backspace character. */
- function char backSpace() {
- return 129;
- }
-
- /** Returns the double quote (") character. */
- function char doubleQuote() {
- return 34;
- }
-}
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