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476 lines (443 loc) · 12 KB
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// @ts-check
/**@constructor*/
BaseStemmer = function() {
/** @protected */
this.current = '';
this.cursor = 0;
this.limit = 0;
this.limit_backward = 0;
this.bra = 0;
this.ket = 0;
/**
* @param {string} value
*/
this.setCurrent = function(value) {
this.current = value;
this.cursor = 0;
this.limit = this.current.length;
this.limit_backward = 0;
this.bra = this.cursor;
this.ket = this.limit;
};
/**
* @return {string}
*/
this.getCurrent = function() {
return this.current;
};
/**
* @param {BaseStemmer} other
*/
this.copy_from = function(other) {
/** @protected */
this.current = other.current;
this.cursor = other.cursor;
this.limit = other.limit;
this.limit_backward = other.limit_backward;
this.bra = other.bra;
this.ket = other.ket;
};
/**
* @param {number[]} s
* @param {number} min
* @param {number} max
* @return {boolean}
*/
this.in_grouping = function(s, min, max) {
/** @protected */
if (this.cursor >= this.limit) return false;
var ch = this.current.charCodeAt(this.cursor);
if (ch > max || ch < min) return false;
ch -= min;
if ((s[ch >>> 3] & (0x1 << (ch & 0x7))) == 0) return false;
this.cursor++;
return true;
};
/**
* @param {number[]} s
* @param {number} min
* @param {number} max
* @return {boolean}
*/
this.go_in_grouping = function(s, min, max) {
/** @protected */
while (this.cursor < this.limit) {
var ch = this.current.charCodeAt(this.cursor);
if (ch > max || ch < min)
return true;
ch -= min;
if ((s[ch >>> 3] & (0x1 << (ch & 0x7))) == 0)
return true;
this.cursor++;
}
return false;
};
/**
* @param {number[]} s
* @param {number} min
* @param {number} max
* @return {boolean}
*/
this.in_grouping_b = function(s, min, max) {
/** @protected */
if (this.cursor <= this.limit_backward) return false;
var ch = this.current.charCodeAt(this.cursor - 1);
if (ch > max || ch < min) return false;
ch -= min;
if ((s[ch >>> 3] & (0x1 << (ch & 0x7))) == 0) return false;
this.cursor--;
return true;
};
/**
* @param {number[]} s
* @param {number} min
* @param {number} max
* @return {boolean}
*/
this.go_in_grouping_b = function(s, min, max) {
/** @protected */
while (this.cursor > this.limit_backward) {
var ch = this.current.charCodeAt(this.cursor - 1);
if (ch > max || ch < min) return true;
ch -= min;
if ((s[ch >>> 3] & (0x1 << (ch & 0x7))) == 0) return true;
this.cursor--;
}
return false;
};
/**
* @param {number[]} s
* @param {number} min
* @param {number} max
* @return {boolean}
*/
this.out_grouping = function(s, min, max) {
/** @protected */
if (this.cursor >= this.limit) return false;
var ch = this.current.charCodeAt(this.cursor);
if (ch > max || ch < min) {
this.cursor++;
return true;
}
ch -= min;
if ((s[ch >>> 3] & (0X1 << (ch & 0x7))) == 0) {
this.cursor++;
return true;
}
return false;
};
/**
* @param {number[]} s
* @param {number} min
* @param {number} max
* @return {boolean}
*/
this.go_out_grouping = function(s, min, max) {
/** @protected */
while (this.cursor < this.limit) {
var ch = this.current.charCodeAt(this.cursor);
if (ch <= max && ch >= min) {
ch -= min;
if ((s[ch >>> 3] & (0X1 << (ch & 0x7))) != 0) {
return true;
}
}
this.cursor++;
}
return false;
};
/**
* @param {number[]} s
* @param {number} min
* @param {number} max
* @return {boolean}
*/
this.out_grouping_b = function(s, min, max) {
/** @protected */
if (this.cursor <= this.limit_backward) return false;
var ch = this.current.charCodeAt(this.cursor - 1);
if (ch > max || ch < min) {
this.cursor--;
return true;
}
ch -= min;
if ((s[ch >>> 3] & (0x1 << (ch & 0x7))) == 0) {
this.cursor--;
return true;
}
return false;
};
/**
* @param {number[]} s
* @param {number} min
* @param {number} max
* @return {boolean}
*/
this.go_out_grouping_b = function(s, min, max) {
/** @protected */
while (this.cursor > this.limit_backward) {
var ch = this.current.charCodeAt(this.cursor - 1);
if (ch <= max && ch >= min) {
ch -= min;
if ((s[ch >>> 3] & (0x1 << (ch & 0x7))) != 0) {
return true;
}
}
this.cursor--;
}
return false;
};
/**
* @param {string} s
* @return {boolean}
*/
this.eq_s = function(s)
{
/** @protected */
if (this.limit - this.cursor < s.length) return false;
if (this.current.slice(this.cursor, this.cursor + s.length) != s)
{
return false;
}
this.cursor += s.length;
return true;
};
/**
* @param {string} s
* @return {boolean}
*/
this.eq_s_b = function(s)
{
/** @protected */
if (this.cursor - this.limit_backward < s.length) return false;
if (this.current.slice(this.cursor - s.length, this.cursor) != s)
{
return false;
}
this.cursor -= s.length;
return true;
};
/**
* @param {Among[]} v
* @return {number}
*/
this.find_among = function(v)
{
/** @protected */
var i = 0;
var j = v.length;
var c = this.cursor;
var l = this.limit;
var common_i = 0;
var common_j = 0;
var first_key_inspected = false;
while (true)
{
var k = i + ((j - i) >>> 1);
var diff = 0;
var common = common_i < common_j ? common_i : common_j; // smaller
// w[0]: string, w[1]: substring_i, w[2]: result, w[3]: function (optional)
var w = v[k];
var i2;
for (i2 = common; i2 < w[0].length; i2++)
{
if (c + common == l)
{
diff = -1;
break;
}
diff = this.current.charCodeAt(c + common) - w[0].charCodeAt(i2);
if (diff != 0) break;
common++;
}
if (diff < 0)
{
j = k;
common_j = common;
}
else
{
i = k;
common_i = common;
}
if (j - i <= 1)
{
if (i > 0) break; // v->s has been inspected
if (j == i) break; // only one item in v
// - but now we need to go round once more to get
// v->s inspected. This looks messy, but is actually
// the optimal approach.
if (first_key_inspected) break;
first_key_inspected = true;
}
}
do {
var w = v[i];
if (common_i >= w[0].length)
{
this.cursor = c + w[0].length;
if (w.length < 4) return w[2];
var res = w[3](this);
this.cursor = c + w[0].length;
if (res) return w[2];
}
i = w[1];
} while (i >= 0);
return 0;
};
// find_among_b is for backwards processing. Same comments apply
/**
* @param {Among[]} v
* @return {number}
*/
this.find_among_b = function(v)
{
/** @protected */
var i = 0;
var j = v.length
var c = this.cursor;
var lb = this.limit_backward;
var common_i = 0;
var common_j = 0;
var first_key_inspected = false;
while (true)
{
var k = i + ((j - i) >> 1);
var diff = 0;
var common = common_i < common_j ? common_i : common_j;
var w = v[k];
var i2;
for (i2 = w[0].length - 1 - common; i2 >= 0; i2--)
{
if (c - common == lb)
{
diff = -1;
break;
}
diff = this.current.charCodeAt(c - 1 - common) - w[0].charCodeAt(i2);
if (diff != 0) break;
common++;
}
if (diff < 0)
{
j = k;
common_j = common;
}
else
{
i = k;
common_i = common;
}
if (j - i <= 1)
{
if (i > 0) break;
if (j == i) break;
if (first_key_inspected) break;
first_key_inspected = true;
}
}
do {
var w = v[i];
if (common_i >= w[0].length)
{
this.cursor = c - w[0].length;
if (w.length < 4) return w[2];
var res = w[3](this);
this.cursor = c - w[0].length;
if (res) return w[2];
}
i = w[1];
} while (i >= 0);
return 0;
};
/* to replace chars between c_bra and c_ket in this.current by the
* chars in s.
*/
/**
* @param {number} c_bra
* @param {number} c_ket
* @param {string} s
* @return {number}
*/
this.replace_s = function(c_bra, c_ket, s)
{
/** @protected */
var adjustment = s.length - (c_ket - c_bra);
this.current = this.current.slice(0, c_bra) + s + this.current.slice(c_ket);
this.limit += adjustment;
if (this.cursor >= c_ket) this.cursor += adjustment;
else if (this.cursor > c_bra) this.cursor = c_bra;
return adjustment;
};
/**
* @return {boolean}
*/
this.slice_check = function()
{
/** @protected */
if (this.bra < 0 ||
this.bra > this.ket ||
this.ket > this.limit ||
this.limit > this.current.length)
{
return false;
}
return true;
};
/**
* @param {number} c_bra
* @return {boolean}
*/
this.slice_from = function(s)
{
/** @protected */
var result = false;
if (this.slice_check())
{
this.replace_s(this.bra, this.ket, s);
result = true;
}
return result;
};
/**
* @return {boolean}
*/
this.slice_del = function()
{
/** @protected */
return this.slice_from("");
};
/**
* @param {number} c_bra
* @param {number} c_ket
* @param {string} s
*/
this.insert = function(c_bra, c_ket, s)
{
/** @protected */
var adjustment = this.replace_s(c_bra, c_ket, s);
if (c_bra <= this.bra) this.bra += adjustment;
if (c_bra <= this.ket) this.ket += adjustment;
};
/**
* @return {string}
*/
this.slice_to = function()
{
/** @protected */
var result = '';
if (this.slice_check())
{
result = this.current.slice(this.bra, this.ket);
}
return result;
};
/**
* @return {string}
*/
this.assign_to = function()
{
/** @protected */
return this.current.slice(0, this.limit);
};
};
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